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C O RN IN G Hazleton MUTAGENICITY TEST ON ; IN AN /A VIVO MOUSE MICRONUCLEUS ASSAY FINAL REPORT AUTHOR Hemalatha Murli, Ph.D. PERFORMING LABORATORY Coming Hazleton Inc. (CHV) 9200 Leesburg Pike Vienna, Virginia 22182 LABORATORY PROJECT IDENTIFICATION CHV Study No.: 17384-0-455 SUBMITTED TO 3M 3M Center, Building 220-2E-02 St. Paul, Minnesota 55144-1000 STUDY COMPLETION DATE May 2,1996 CHV Study No.: 17384-0-455 1 of 24 0032S C O R N IN G Hazleton QUALITY ASSURANCE STATEMENT Project Title: In Vivo Mouse Micronucleus Assay Project No.: 20996 Assay No.: 17384 Protocol No.: 455 Edition No.: 17 Quality Assurance inspections of the study and review of the final report of the above referenced project were conducted according to the Standard Operating Procedures of the Quality Assurance Unit and according to the general requirements of the appropriate Good Laboratory Practice regulations. Findings from the inspections and final report review were reported to management and to the study director on the following dates: Inspection/Date Findings Reported Auditor Weighing of Test Article/03/05/1996 03/05/1996 C. Smith Dilution of Test Article/03/05/1996 03/05/1996 C. Smith Draft Report Review/04/24/1996 04/25/1996 C. Orantes Final Report Review/05/02/1996 05/02/1996 C. Orantes Quality Assurance Unit CHV Study No.: 17384-0-455 2 001326 C O R N IN G Hazleton STUDY COMPLIANCE AND CERTIFICATION The described study was conducted in compliance with the Good Laboratory Practice regulations as set forth in the Food and Drug Administration (FDA) Title 21 of the U.S. Code of Federal Regulations Part 58, issued December 22,1978, (effective June 20,1979) with any applicable amendments. There were no significant deviations from the aforementioned regulations or the signed protocol that would affect the integrity of the study or the interpretation of the test results. The raw data have been reviewed by the Study Director, who certifies that the evaluation of the test article as presented herein represents an appropriate conclusion within the context of the study design and evaluation criteria. All test and control results in this report are supported by an experimental data record and this record has been reviewed by the Study Director. All raw data, documentation, records, protocol and a copy of the final report generated as a result of this study will be archived in the storage facilities of Coming Hazleton Inc. for at least one year following submission of the final report to the Sponsor. After the one year period, the Sponsor may elect to have the aforementioned materials retained in the storage facilities of Coming Hazleton Inc. for an additional period of time, or sent to a storage facility designated by the Sponsor. Submitted By: Study Director: Hemalatha Murli, Ph.D. Mammalian Cytogenetics Department of Genetic and Cellular Toxicology Study Completion Date CHV Study No.: 17384-0-455 3 001327 C O R N IN G Hazleton TABLE OF CONTENTS Page No. S U M M A R Y .................................................................................................................................... 6 1.0 SPONSOR.......................................................................................................................7 2.0 MATERIAL (Test Article) .............................................................................................7 2.1 Client's Identification 2.2 Date Received 2.3 Physical Description 2.4 Genetics Assay No. 3.0 TYPE OF A SSA Y ...........................................................................................................7 4.0 PROTOCOL NO............................................................................................................... 7 5.0 STUDY DATES ............................................................................................. 5.1 Initiation Date 5.2 Experimental Start Date 5.3 Experimental Termination Date 7 6.0 SUPERVISORY PERSONNEL ........................................................ 6.1 Study Director 6.2 Laboratory Supervisor 7 7.0 OBJECTIVE ................................................................................................................... 7 8.0 MATERIALS ................................................................................................................. 8 9.0 SOLUBILITY AND STABILITY:.................................................................................8 10.0 DOSE SELECTION STUDY ........................................................................................ 9 10.1 Dose Selection 10.2 Dosing Information 10.3 Results and Interpretation 10.4 Conclusion CHV Study No.: 17384-0-455 4 0 0 :1 .1 2 8 C O R N IN G Hazleton 11.0 MICRONUCLEUS ST U D Y ..........................................................................................11 11.1 Dose Selection 11.2 Micronucleus Assay Dosing Information 12.0 BONE MARROW HARVEST, SLIDE PREPARATION AND ANALYSIS ..........12 13.0 EVALUATION CRITERIA .........................................................................................13 13.1 General 13.2 Data Presentation and Interpretation 14.0 RESULTS AND INTERPRETATION.........................................................................13 15.0 CONCLUSION................ 15 16.0 REFERENCES ............................................................ 15 17.0 DEVIATION FROM THE SIGNED PROTOCOL .................................................... 15 18.0 EXPERIMENT DATA TABLES ...................................................................... 16 CHV Study No.: 17384-0-455 5 001329 C O R N IN G Hazleton SUMMARY Mutagenicity Test on T-6292 in an In Vivo Mouse Micronucleus Assay The objective of this in vivo assay was to evaluate the ability of the test article, T-6292, to induce micronuclei in bone marrow polychromatic erythrocytes of Crl:CD-l(ICR) BR mice. In the dose selection study, the test article was solubilized in acetone:com oil (40%:60%, v:v) and dosed by oral gavage at 0, 1000,1400, 1800,2200, and 2600 mg/kg. Six animals (three males and three females) were assigned to each dose group. Animals were observed for three days after dosing for toxic signs and/or mortality. Based on the results of the dose selection study, the maximum tolerated dose was estimated as about 2200 mg/kg. In the micronucleus assay, the test article was solubilized in acetone:com oil (40%:60%, v:v) and dosed oral gavage at 550,1100, and 2200 mg/kg. Ten animals (five males and five females) were randomly assigned to each dose/harvest time group. Vehicle and positive control groups, euthanatized approximately 24 hours after dosing, were included in the assay. The animals dosed with the test article were euthanatized approximately 24,48 and 72 hours after dosing for extraction of the bone marrow. The test material, T-6292, did not induce a significant increase in micronuclei in bone marrow polychromatic erythrocytes under the conditions of this assay and is considered negative in the mouse bone marrow micronucleus test. CHY Study No.: 17384-0-455 6 C O R N IN G Hazleton Mutagenicity Test on T-6292 in an in vivo Mouse Micronucleus Assay 1.0 SPONSOR: 3M 2.0 MATERIAL (Test Article) 2.1 Client's Identification: T-6292 2.2 Date Received: January 16,1996 2.3 Physical Description: Amber, waxy solid 2.4 Genetics Assay No.: 17384 3.0 TYPE OF ASSAY: In Vivo Mouse Micronucleus Assay 4.0 PROTOCOL NO.: 455, Edition 17 5.0 STUDY DATES 5.1 Initiation Date: January 18,1996 5.2 Experimental Start Date: February 20,1996 5.3 Experimental Termination Date: April 16,1996 6.0 SUPERVISORY PERSONNEL 6.1 Study Director: Hemalatha Murli, Ph.D. 6.2 Laboratory Supervisor: Monica Vegarra, B.S. 7.0 OBJECTIVE The objective of this in vivo assay was to evaluate the ability of the test article, T-6292, to induce micronuclei in bone marrow polychromatic erythrocytes of Crl:CD-l(ICR) BR mice. This study was conducted using modifications of the procedures suggested by Heddle et al. (1983). CHV Study No.: 17384-0-455 7 001.131 C O R N IN G Hazleton 8.0 MATERIALS Adult male and female mice, strain Crl:CD-l(ICR) BR, were purchased from Charles River Laboratories, Portage, MI. This healthy, random bred strain was selected to maximize genetic heterogeneity and at the same time assure access to a common source. The protocol for this study was approved by the CHV-ACUC prior to the initiation of dosing. Animals were housed up to seven per cage during quarantine, and housed up to five per cage at randomization. The temperature and relative humidity were maintained at 726F and 5515%, respectively, except on February 17,18, and 19,1996, for the dose selection study, when the relative humidity was recorded at 39.1%, 37.3%, and 34.5%, respectively, and on February 24,24,25, and March 2,1996, for the micronucleus assay, when the relative humidity was recorded at 32.5%, 34.4%, 20.8%, and 35.5%, respectively. A 12-hour light/12-hour dark cycle was maintained. A commercial diet (Purina Certified Laboratory Pellets # 5002) and water were available ad libitum for the duration of the study. The feed was analyzed by the manufacturer for concentrations of specified heavy metals, aflatoxin, chlorinated hydrocarbons, organophosphates, and specified nutrients. The water was analyzed on a retrospective basis for specified microorganisms, pesticides, alkalinity, heavy metals, and halogens. Sanitized caging was used for housing the animals. Personnel handling animals or working within the animal facilities were required to wear suitable protective garments and equipment. Animals were quarantined for seven days before being placed on study. Animals were randomly assigned to study groups and were individually weighed prior to dosing. All animals were dosed based upon the individual body weights. Animals were uniquely identified by ear tag. Dose or treatment groups were identified by cage card/label. At the termination of the study all surviving animals were euthanatized by C 02inhalation followed by penetration of the thorax. Any extra animals not used for the study were used for training purposes. 9.0 SOLUBILITY AND STABILITY: The test article, T-6292, was supplied as an amber, waxy solid. The solubility of the test article was evaluated in 0.5% high viscosity carboxymethylcellulose (CMC), com oil, and acetone:com oil (40%:60%, v:v). The vehicles, 0.5% high viscosity CMC and com oil did not produce suitable suspensions of T-6292. An acceptable emulsion was obtained in acetonercom oil (40%:60%, v:v) at a concentration of about 422.3 mg/ml. CHV Study No.: 17384-0-455 8 0 0 1 .1 3 2 C O R N IN G Hazleton The stability of the test material under the dosing conditions of this assay is the responsibility of the sponsor. 10.0 DOSE SELECTION STUDY 10.1 Dose Selection Dose levels of 0,1000,1400,1800,2200, and 2600 mg/kg were administered by oral gavage for the dose selection study. 10.2 Dosing Information The animals used in the dose selection assay were dosed on February 20,1996. The weight range of the animals used in the dose range finding assay was 30.135.1 and 21.6-26.2 grams, for the males and females, respectively. Dosing solutions were prepared just prior to dosing and were prepared by making a 260 mg/ml stock for the high dose (2600 mg/kg). This was prepared by adding 11.0 ml of 40%:60%, v:v of acetone:com oil (Sigma, Lot # 2435KHXG: Duke's com oil, Lot# 5D 17 12:46) to 3.1200 g of T-6292, resulting in an opaque, creamcolored emulsion that settled down to a bilayer with a final volume of 12.0 ml. An opaque, cream-colored emulsion resulted upon mixing. Dilutions of this stock were prepared for the 1000,1400,1800 and 2200 mg/kg dose levels. All dosing stocks were placed on magnetic stir plates during the dosing procedure. Dosing was achieved using a 10.0 ml/kg dosing volume. All animals were eight weeks and one day old at the time of dosing. An outline of the dosing scheme is found in the following table. A total of 36 animals was used in this assay. DOSE GROUPS TREATMENT M F T-6292 0 mg/kg 1000 mg/kg 1400 mg/kg 1800 mg/kg 2200 mg/kg 2600 mg/kg 33 33 33 33 33 33 All doses given were on an acute (one-time only) basis. CHV Study No.: 17384-0-455 9 C O R N IN G Hazleton 10.3 Results and Interpretation All animals were examined after dosing and daily throughout the duration of the study (three days) for toxic effects and/or mortalities. All animals appeared normal immediately and about 4.6 hours after dosing. Approximately 20.3 hours after dosing, all animals at the 0,1000,1400, 1800 and 2600 mg/kg dose levels appeared normal, except for one male (#6524) from the 2600 mg/kg dose level which appeared hypoactive. The males at the 2400 mg/kg dose level appeared hypoactive with squinted eyes and chromodacryorrhea and the females at the 2400 mg/kg dose level appeared hunched and exceptionally hypoactive with squinted eyes and chromodacryorrhea. Approximately 44 hours after dosing, the animals at the 0 and 1000 mg/kg dose levels appeared normal. The animals at the 1400 and 1800 mg/kg dose levels appeared hypoactive. One 2200 mg/kg dose level female (# 6531) was found dead. The remaining animals at the 2200 and 2600 mg/kg dose levels appeared hunched and very hypoactive with dyspnea. Approximately 68.4 hours after dosing, the animals at the 0 and 1000 mg/kg dose levels appeared normal. The animals at the 1400 and 1800 mg/kg dose levels appeared hypoactive with rough haircoats. The animals at the 2200 and 2600 mg/kg dose levels appeared hunched and hypoactive with rough haircoats. The mortality data for this assay are summarized in the following table: Summary of Mortalities Within 3 Days in Mice Dosed Acutely with T-6292 Observations Treatment______________ Mai?______________Female 0 mg/kg 0/3 0/3 1000 mg/kg 0/3 0/3 1400 mg/kg 0/3 0/3 1800 mg/kg 0/3 0/3 2200 mg/kg 0/3 1/3 2600 mg/kg 0/3 0/3 CHV Study No.: 17384-0-455 10 001334 C O R N IN G Hazleton 10.4 Conclusion Based on these results, the maximum tolerated dose was estimated to be about 2200 mg/kg. 11.0 MICRONUCLEUS STUDY 11.1 Dose Selection Based on results from the dose selection study, dose levels of 550,1100, and 2200 mg/kg were selected for testing in this study. 11.2 Micronucleus Assay Dosing Information The animals used in the micronucleus assay were dosed on March 5,1996. Cyclophosphamide (CAS # 6055-19-2; Sigma, Lot # 44H0486), the positive control, was solubilized in sterile deionized water (Lot #19, prepared at CHV) and was administered by oral gavage at 80.0 mg/kg. The vehicle control, a 40%:60%, v:v of acetonexom oil ( Sigma, Lot # 2435KHXG and Duke's com oil, Lot # 5D 17 12:46), was administered concurrently with the test article at a volume of 10.0 ml/kg. The weight range of the animals used in the micronucleus assay was 27.2-35.2 grams and 21.7-28.1 grams for the males and females, respectively. The dosing solutions for the assay were prepared by making a 220 mg/ml stock for the high dose (2200 mg/kg). This was prepared by adding 10.0 ml of vehicle to 5.5070 g of T-6292, mixing thoroughly for about 2 minutes and then bringing the suspension to a final volume of 25.0 ml. A pale yellow-tan emulsion that became a bilayer of pale tan solution over a heavy yellow solution was obtained. Dilutions of this stock were prepared for the remaining dose levels. During formulation and during the dosing procedure, all dosing stocks were placed on magnetic stir plates. A second group of animals (designated Secondary Dose Group) was also assigned to the study and was dosed with the high dose of the test article. These animals were only used in the assay as replacements for any which died in the primary dose group. Ten animals (five males and five females) were randomly assigned to each dose/harvest time group. Vehicle and positive control groups, euthanatized approximately 24 hours after dosing, were included in the assay. The animals dosed with the test article were euthanatized approximately 24,48 and 72 hours after dosing for extraction of the bone marrow. An outline of the dosing scheme is found in the following table: CHV Study No.: 17384-0-455 11 C O R N IN G Hazleton Dosing Scheme for Micronucleus Assay A total of 120 animals was used in this assay Number of Animals Assigned Treatment T-6292 2200 mg/kg Primary Dose Groups 24 Hr 48 Hr 72 Hr MF MF MF 55 55 55 Secondary Dose Groups1 Male Female 55 1100 mg/kg 55 55 55 -- 550 mg/kg 55 55 55 - - Vehicle Control, acetone:com oil, 40%:60%, v:v 10.0 ml/kg 55 - - -- -- Positive Control, Cyclophosphamide, 80.0 mg/kg 5 5 - - - - - - a The animals assigned to the secondary dose groups were dosed and were only used to replace animals which died in the primary dose group at the high dose level. All extra animals not used as replacements were euthanatized at the completion of the trial. The age of the animals at the time of dosing was eight weeks and one day. Volumes dosed were 10.0 ml/kg and were based upon individual animal weights. 12.0 BONE MARROW HARVEST, SLIDE PREPARATION AND ANALYSIS At the appropriate harvest time, the animals were euthanatized with C 02followed by penetration of the thorax and the adhering soft tissue and epiphyses of both femora were removed. The marrow was flushed from the bone and transferred to centrifuge tubes containing 3 - 5 ml bovine serum (one tube for each animal). Following centrifugation to pellet the tissue, the supernatant was removed by aspiration and portions of the pellet were spread on slides and air dried. The slides were fixed in methanol, and stained in May-Grunwald solution followed by Giemsa (Schmid, 1975). The air-dried slides were coverslipped using Depex mounting medium. The slides were coded for analysis, and scored for micronuclei and the polychromatic erythrocyte (PCE) to normochromatic erythrocyte (NCE) cell ratio. Standard forms were used to record these data. One thousand PCEs per animal were scored. The frequency of micronucleated cells was expressed as percent micronucleated cells based on the total PCEs present in the scored optic field. The normal frequency of micronuclei in this Crl:CD-l(ICR) BR strain is about 0.0-0.4%. CHV Study No.: 17384-0-455 12 001336 C O R N IN G Hazleton The frequency of PCEs versus NCEs was determined by scoring the number of PCEs and NCEs observed in the optic fields while scoring the first 1000 erythrocytes. 13.0 EVALUATION CRITERIA: 13.1 General The criteria for the identification of micronuclei were those of Schmid (1976). Micronuclei were darkly stained and generally round, although almond and ringshaped micronuclei occasionally occurred. Micronuclei had sharp borders and were generally between 1/20 and 1/5 the size of the PCE. The unit of scoring was the micronucleated cell, not the micronucleus; thus the occasional cell with more than one micronucleus was counted as one micronucleated PCE, not two (or more) micronuclei. The staining procedure permitted the differentiation by color of PCEs and NCEs (bluish-grey and red, respectively). 13.2 Data Presentation and Interpretation Data are summarized by sex and dose groups for the different time points. Individual animal data are also presented. The analysis of these data was performed using an analysis of variance (Winer, 1971) on either untransformed (when variances are homogeneous) and rank transformed (when variances are heterogeneous) proportions of cells with micronuclei per animal. If the analysis of variance was significant (p<0.05), a Dunnett's t-test (Dunnett, 1955; 1964) was used to determine which dose groups, if any, were significantly different from the negative control. Analyses were performed separately for each harvest time and sex combination. The criteria for determining a positive response involved a statistically significant dose-related increase in micronucleated PCEs, or the detection of a reproducible and statistically significant positive response for at least one dose level. A test article that induced neither a statistically significant dose response nor a statistically significant and reproducible increase at one dose level was considered negative. In either case, the final decision was based on scientific judgment. 14.0 RESULTS AND INTERPRETATION: All animals were observed immediately after dosing and periodically throughout the duration of the assay for toxic symptoms and/or mortalities. All animals in the vehicle and positive control groups (except one female, # 6846, from the vehicle group, which appeared hypoactive at about 1.4 hours after dosing) appeared normal after dosing and CHV Study No.: 17384-0-455 13 001.137 C O R N IN G Hazleton remained healthy until the appropriate harvest times. By about 20.4 hours after dosing, female (# 6846) from the vehicle group appeared normal and remained healthy until the 24 hour harvest time. Approximately 1.4 hours after dosing, all 550,1100 and 2200 mg/kg dose level animals appeared hypoactive, with some also showing excessive salivation. Approximately 20.4 hours after dosing, the 550 mg/kg dose level animals appeared normal. At the 1100 mg/kg dose level, the 24 hour harvest males appeared normal and the females appeared hypoactive. The 48 hour harvest animals appeared hypoactive with rough haircoats. The 72 hour harvest animals appeared hypoactive with rough haircoats and some with dyspnea. Approximately 43.4 hours after dosing, the 550 mg/kg dose level animals appeared normal. At the 1100 mg/kg dose level, the animals appeared hypoactive with rough haircoats and dyspnea. Some also had squinted eyes and were hunched. At the 2200 mg/kg dose level, the animals appeared hypoactive with rough haircoats, dyspnea, squinted eyes and chromodacryorrhea. Approximately 47.5 hours after dosing, 1 female (#6916) from the 2200 mg/kg dose level and 48 hour harvest was found dead. Approximately 68.4 hours after dosing, the 550 mg/kg dose level animals appeared normal. At the 1100 mg/kg dose level, one female (# 6920) was found dead and the remaining animals appeared hypoactive. At the 2200 mg/kg dose level, the animals appeared hypoactive with rough haircoats and some were hunched. The test article, T-6292, induced no significant increases in micronucleated polychromatic erythrocytes over the levels observed in the vehicle controls in either sex or at any of the harvest times. Due to toxicity, the PCE/NCE ratios of the females from the 72 hour harvest and 550, 1100, and 2200 mg/kg dose groups were significantly reduced when compared to the vehicle control females. The positive control, CP, induced significant increases in micronucleated PCEs in both sexes as compared to the vehicle controls, with means and standard errors of 3.86% 0.49% and 4.84% 0.74% for the males and females, respectively. The data summarized by dose group are presented in Table 1 and individual animal data are found in Tables 2 through 7. Historical control data are presented in Table 8. CHV Study No.: 17384-0-455 14 001338 C O R N IN G Hazleton 15.0 CONCLUSION: The test material, T-6292, did not induce a significant increase in micronuclei in bone marrow polychromatic erythrocytes under the conditions of this assay and is considered negative in the mouse micronucleus assay. 16.0 REFERENCES: Dunnett, C.W.: A multiple comparisons procedure for comparing several treatments with a control. J. Am. Statist. Assoc., 50:1096-1121,1955. Dunnett, C.W.: New tables for multiple comparisons with a control. Biometrics, 20:482491,1964. Heddle, J.A., Hite, M., Kirkhart, B., Larsen, K., MacGregor, J.T., Newell, G.W. and Salamone, M.F.: The induction of micronuclei as a measure of genotoxicity. Mutation Res.. 123:61-118.1983. Schmid, W.: The micronucleus test. Mutation Res., 11:9-15, 1975. Schmid, W.: The micronucleus test for cytogenetic analysis. Chemical Mutagens: Principles and Methods for Their Detection, Vol. 4 (A. Hollaender, ed.). Plenum, pp. 31-53,1976. Winer, B.J.: Statistical Principles in Experimental Design, McGraw-Hill, New York, Second Edition, 1971. 17.0 DEVIATION FROM THE SIGNED PROTOCOL The following deviation was made from the signed protocol. Relative humidity was recorded on February 17,18, and 19,1996, (for the dose selection study) at 39.1%, 37.3%, and 34.5%, respectively, and on February 24,24,25, and March 2, 1996, (for the micronucleus assay), when the relative humidity was recorded at 32.5%, 34.4%, 20.8%, and 35.5%, respectively. CHV Study No.: 17384-0-455 15 OO1 3 3 3 C O R N IN G Hazleton 18.0 EXPERIMENT DATA TABLES CHV Study No.: 17384-0-455 16 C O R N IN G Hazleton SPONSOR: 3M TABLE 1 MICRONUCLEUS DATA SUMMARY TABLE TEST ARTICLE: T-6292 ASSAY: 17384 TREATMENT DOSE HARVEST % MICRONUCLEATED PCEs TIME MEAN OF 1000 PER ANIMAL S.E. (HR) MALES FEMALES TOTAL CONTROLS VEHICLE 40% Acetone/ 24 hr 60% Com Oil 0.12 0.04 0.10 0.04 0.11 0.03 POSITIVE CP 80.0 mg/kg 24 hr 3.86 0.49* 4.84 0.74* 4.35 0.45* RATIO PCE:NCE MEAN S.E. MALES FEMALES 0.51 0.08 0.40 0.04 0.72 0.08 0.51 0.04** TEST ARTICLE 550 mg/kg 24 hr 48 hr 72 hr 1100 mg/kg 24 hr 48 hr 72 hr 2200 mg/kg 24 hr 48 hr 72 hr 0.14 0.06 0.10 0.00 0.12 0.07 0.12 0.04 0.14 0.04 0.10 0.05 0.18 0.06 0.12 0.07 0.06 0.02 0.12 0.05 0.16 0.07 0.18 0.04 0.06 0.02 0.18 0.05 0.05 0.05 0.10 0.04 0.15 0.06 0.26 0.09 0.13 0.04 0.13 0.03 0.15 0.04 0.09 0.02 0.16 0.03 0.08 0.04 0.14 0.04 0.13 0.05 0.16 0.05 0.56 0.05 0.78 0.11 0.61 0.12 0.47 0.03 0.70 0.06 0.63 0.07 0.52 0.04 0.82 0.11 0.57 0.05 0.75 0.08 0.62 0.13 0.48 0.04** 0.73 0.13 0.64 0.08 0.44 0.04** 0.60 0.11 0.56 0.07 0.30 0.02** * Significantly greater than the corresponding vehicle control, p<0.05. ** Significantly lower than the corresponding vehicle control, p<0.05. CP = Cyclophosphamide CHV Study No.: 17384-0-455 17 001341 C O R N IN G Hazleton TABLE 2 MICRONUCLEUS TEST - INDIVIDUAL ANIMAL DATA SPONSOR: 3M TEST ARTICLE: T-6292 ASSAY NO.: 17384 TREATMENT ANIMAL NpC^ NUMBER RATIO PCE:NCE 24 HOUR HARVEST MALE VEHICLE CONTROL 40% Acetone/60% Com Oil 6846 2 6860 2 6870 1 6882 1 6896 0 POSITIVE CONTROL CP 80.0 mg/kg 6855 43 6867 42 6868 51 6886 35 6891 22 TEST ARTICLE SSO mg/kg 6859 2 6862 2 6872 3 6883 0 6893 0 1100 mg/kg 6861 1 6863 1 6873 2 6878 0 6889 2 2200 mg/kg 6856 1 6865 1 6871 2 6874 4 6888 1 0.64 0.26 0.37 0.72 0.56 0.34 0.43 0.49 0.45 0.27 0.63 0.38 0.52 0.63 0.64 0.56 0.43 0.37 0.48 0.49 0.57 0.47 0.38 0.62 0.54 CP = Cyclophosphamide MN = Micronucleus PCE = Polychromatic erythrocyte # MN PCEs = Micronucleated PCEs NCE *=Normochromatic erythrocyte CHV Study No.: 17384-0-455 18 C O R N IN G Hazleton TABLE 3 MICRONUCLEUS TEST - INDIVIDUAL ANIMAL DATA SPONSOR: 3M TEST ARTICLE: T-6292 ASSAY NO.: 17384 TREATMENT 24 HOUR HARVEST FEMALE ANIMAL NUMBER NO. MN PCEs (1000) RATIO PCE:NCE VEHICLE CONTROL 40% Acetone/60% Com Oil POSITIVE CONTROL CP 80.0 mg/kg TEST ARTICLE 550 mg/kg 1100 mg/kg 2200 mg/kg 6900 2 6902 1 6923 0 6928 2 6953 0 6897 32 6898 56 6906 34 6926 72 6945 48 6908 3 6909 1 6930 1 6941 1 6951 0 6907 1 6921 1 6929 0 6935 1 6948 0 6904 2 6914 0 6917 1 6942 2 6952 0 0.65 0.69 1.01 0.59 0.64 0.54 0.60 0.41 0.42 0.57 0.53 0.69 0.86 0.68 1.00 0.37 1.00 0.94 0.45 0.89 0.72 0.75 0.26 0.41 0.87 CP = Cyclophosphamide MN = Micronucleus PCE = Polychromatic erythrocyte # MN PCEs = Micronucleated PCEs NCE = Normochromatic erythrocyte CHV Study No.: 17384-0-455 19 001343 C O R N IN G Hazleton TABLE 4 MICRONUCLEUS TEST - INDIVIDUAL ANIMAL DATA SPONSOR: 3M TEST ARTICLE: T-6292 ASSAY NO.: 17384 TREATMENT 48 HOUR HARVEST MALE ANIMAL NUMBER NO. MN PCEs (1000) RATIO PCE:NCE TEST ARTICLE 550 mg/kg 1100 mg/kg 2200 mg/kg 6838 1 6848 1 6866 1 6876 1 6887 1 6847 2 6869 2 6881 1 6884 0 6892 2 6844 3 6853 3 6877 0 6890 0 6895 0 1.10 0.91 0.82 0.52 0.54 0.78 0.63 0.71 0.52 0.87 0.75 0.92 1.18 0.69 0.58 MN = Micronucleus PCE = Polychromatic erythrocyte # MN PCEs = Micronucleated PCEs NCE = Normochromatic erythrocyte CHV Study No.: 17384-0-455 20 C O R N IN G Hazleton TABLE 5 MICRONUCLEUS TEST - INDIVIDUAL ANIMAL DATA SPONSOR: 3M TEST ARTICLE: T-6292 ASSAY NO.: 17384 TREATMENT AAMNIIMMAATL NpOr.pMN RATIO NUMBER " PCE:NCE 48 HOUR HARVEST FEMALE TEST ARTICLE 550 mg/kg 1100 mg/kg 2200 mg/kg 6910 6925 6927 6939 6943 6911 6931 6934 6946 6955 6901 6916* 6932 6937 6950 3 0 3 2 0 2 0 2 2 3 3 2 0 1 0.43 0.87 0.39 0.40 1.01 0.61 0.93 0.43 0.65 0.55 0.61 0.44 0.75 0.43 * Animal found dead MN = Micronucleus PCE = Polychromatic erythrocyte # MN PCEs = Micronucleated PCEs NCE = Normochromatic erythrocyte CHV Study No.: 17384-0-455 21 C O R N IN G Hazleton TABLE 6 MICRONUCLEUS TEST - INDIVIDUAL ANIMAL DATA SPONSOR: 3M TEST ARTICLE: T-6292 ASSAY NO.: 17384 TREATMENT ANIMAL NUMBER RATIO PCE:NCE 72 HOUR HARVEST MALE TEST ARTICLE 550 mg/kg 1100 mg/kg 2200 mg/kg 6839 0 6858 3 6879 0 6880 3 6894 0 6837 0 6841 0 6843 1 6851 1 6864 3 6840 1 6845 1 6849 0 6857 1 6885 0 1.00 0.24 0.61 0.61 0.59 0.62 0.84 0.53 0.71 0.45 0.72 0.58 0.60 0.41 0.55 MN = Micronucleus PCE = Polychromatic erythrocyte # MN PCEs = Micronucleated PCEs NCE = Normochromatic erythrocyte CHV Study No.: 17384-0-455 22 001346 C O R N IN G Hazleton TABLE 7 MICRONUCLEUS TEST - INDIVIDUAL ANIMAL DATA SPONSOR: 3M TEST ARTICLE: T-6292 ASSAY NO.: 17384 TREATMENT 72 HOUR HARVEST FEMALE ANIMAL NUMBER NO. MN PCEs (1000) RATIO PCE:NCE TEST ARTICLE SSO mg/kg 1100 mg/kg 2200 mg/kg 6903 6915 6940 6949 6954 6920* 6922 6938 6944 6947 6905 6918 6919 6924 6956 2 1 3 1 2 2 0 0 0 2 1 2 2 6 0.58 0.56 0.38 0.43 0.46 0.32 0.53 0.44 0.45 0.24 0.37 0.26 0.34 0.31 * Animal found dead MN = Micronucleus PCE = Polychromatic erythrocyte # MN PCEs = Micronucleated PCEs NCE = Normochromatic eiythrocyte CHV Study No.: 17384-0-455 23 001347 C O R N IN G Hazleton TABLE 8 MOUSE MICRONUCLEUS HISTORICAL CONTROL DATA 7/95 THROUGH 12/95 POOLED VEHICLE CONTROLS MIN MAX AVG N % MICRONUCLEATED PCEs PER 1000 PCE MEAN OF 1000 PER ANIMAL S.E. MALES FEMALES TOTAL 0.00 0.22 0.087 0.007 47 0.00 0.24 0.081 0.008 47 0.01 0.17 0.084 0.005 47 RATIO PCE:NCE MEAN S.E. MALES FEMALES 0.31 0.85 0.550 0.021 47 0.24 1.03 0.587 0.025 47 POSITIVE CONTROLS Cyclophosphamide, 80.0 mg/kg MIN MAX AVG N 2.00 5.68 3.682 0.240 19 PCE = Polychromatic erythrocyte NCE = Normochromatic erythrocyte 1.50 6.36 3.170 0.245 19 2.41 5.38 3.426 0.184 19 0.41 0.72 0.577 0.020 19 0.40 0.79 0.588 0.026 19 CHV Study No.: 17384-0-455 24 001348 CHV STUDY NO. ______________ PROTOCOL NO. 455, EDITION 17 C O R N IN G Hazleton IN VIVO MOUSE MICRONUCLEUS ASSAY Corning Hazleton Inc. (CHV) will conduct this study in compliance with Good Laboratory Practice (GLP) Regulations. This protocol, critical phase(s) of the work in progress and the final report will be subject to audit by Quality Assurance in accordance with SOPs at Corining Hazleton Inc. The study will be conducted by CHV at 9200 Leesburg Pike, Vienna, Virginia 22182. PART 1. SPONSOR INFORMATION AND APPROVALS I. SPONSOR IDENTIFICATION Company Name: Address: _______________________________________________ j - t f c u J , f f l f j ________________________________ II. TEST ARTICLE IDENTIFICATION: _______________________ III. TEST ARTICLE ANALYSIS Determination of the test article stability and the test article characteristics as defined in the GLP regulations is the responsibility of the Sponsor. IV. NOTIFICATION OF REGULATORY SUBMISSION In order to comply with the GLP regulations, consulting laboratories must be notified if all or part of a study is intended for regulatory submission. CHV maintains a master schedule of studies which fall under regulatory review. Please indicate which agency, if any, might receive the results of this study: \r-Tyrf lr = il Undetermined U==!l li -il ===J MAFF -- h V = MOHW FDA If------- il B-- !l EPA-TSCA ii '- it ii. . . " il B== U OECD li==JJ OTHER ii~ .... il U===U EPA-FIFRA 4/95 1 of 10 001349 PROTOCOL NO. 455, EDITION 17 V. STUDY DATES Proposed Experimental Start Date: Proposed Experimental Termination Date: VI. APPROVAL OF STUDY PROTOCOL Study Director: Hemalatha Murli, Ph.D. Sponsor's Authorized Representative: C O R N IN G Hazleton Date: Date : 4/95 2 of 10 001350 PROTOCOL NO. 455. EDITION 17 C O R N IN G Hazleton PART 2 - STUDY PROTOCOL IN VIVO MOUSE MICRONUCLEUS ASSAY OBJECTIVE The objective of this study is to evaluate a test article for clastogenic activity and disruption of the mitotic apparatus in polychromatic erythrocyte stem cells in mouse bone marrow in vivo. l i . DEFINITIONS Micronucleus: a small chromatin body, consisting of entire chromosome(s) and/or of acentric chromosome fragment(s), which lags behind at mitotic anaphase. After telophase, these chromosome(s ) and fragmentes) may not be included in the daughter nuclei, and may form single or multiple micronuclei in the cytoplasm. i n . RATIONALE The micronucleus test can serve as a rapid screen for clastogenic agents and test articles which interfere with normal mitotic cell division (Schmid, 1975; Heddle et. al., 1983). Micronuclei are formed from chromosomes or chromosome fragments left behind during anaphase and can be scored during interphase because they persist (Schmid, 1975). In this assay, polychromatic erythrocytes (PCEs) in the bone marrow are scored for the presence of micronuclei. During maturation from erythroblast to erythrocyte the nucleus is extruded, while micronuclei, if present, remain in the cytoplasm. Detection of micronuclei in non-nucleated cells is thus facilitated, and time involved in searching for metaphase spreads in treated cell populations is eliminated. Test articles affecting spindle-fiber function or formation as well as clastogenic agents can be detected through micronucleus induction (Schmid, 1975) . IV. MATERIALS A. Animals Young adult male and female mice of the ICR strain, 810 weeks old at the time of dosing, will be purchased from Charles River Laboratories, Inc., or Harlan Sprague-Dawley, Inc. This strain has been selected to 4/95 3 of 10 001351 PROTOCOL NO. 455, EDITION 17 C O R N IN G Hazleton maximize genetic heterogeneity and at the same time ensure access to a common source. B . Control Articles Cyclophosphamide (CP, 80 mg/kg; dosing volume of 10 ml/kg) will be used as the positive control article and will be administered by oral gavage. The vehicle control article will consist of the solvent or vehicle used for the test article and will be administered by the same route as, and concurrently with, the test article and in amounts equal to the maximum volumes administered to the experimental animals. The dosing volume will not exceed 20 ml/kg for oral gavage and IP administrations. The vehicles generally used in the assay are water, 0.5Z aqueous carboxymethylcellulose solution, or corn oil. V. EXPERIMENTAL DESIGN A. Animal Husbandry All applicable CHV SOPs will be followed. Animals will be isolated by sex. Animals will be housed up to seven per cage during quarantine, and will be housed up to five prior to experiment initiation. Animals are housed under the following climatic conditions: temperature, 72F 6F; humidity, 55Z 15Z; light cycle, 12 hours light/dark. A commercial diet (Purina Certified Laboratory Chow #5002) and tap water will be available ad libitum. The feed is analyzed by the manufacturer for concentrations of specified heavy metals, aflatoxin, chlorinated hydrocarbons, organophosphates, and specified nutrients. The water is analyzed biannually on a retrospective basis for specified microorganisms, pesticides, heavy metals, alkalinity, and halogens. Animals will be quarantined for at least 7 days before being placed on study. Animals will be assigned to study groups at random according to Coning Hazleton Standard Operating Procedures. Animals will be weighed prior to dosing. They will be dosed based upon the individual animal weights. Animals will be uniquely identified by ear tag. Treatment groups will be identified by cage label/card. 4/95 4 of 10 01352 PROTOCOL NO. 455, EDITION 17 C O R N IN G Hazleton Sanitary cages will be used. Personnel handling animals or working within the animal facilities will be required to wear suitable protective garments and equipment. Dose Selection The high dose generally will be selected as 802 of the maximum tolerated dose. The high dose should produce some indication of toxicity (e.g., death, depression of ratio of PCEs to normochromatic erythrocytes (NCEs). One-half and one-quarter of this high dose will normally be used as the intermediate and low dose levels, respectively. Use of a high dose increases the likelihood that a weak clastogen will be detected, and is therefore recommended. If no appropriate range finding data are available, a range finding study can be performed. The top dose tested in the dose rangefinding study will be 5000 mg/kg. The dose levels tested will be issued as an amendment. DOSE RANGEFINDING STUDY The dose rangefinding study will be conducted using five treatment groups. Each of the five groups will consist of 3 male and 3 female mice. Group Designation and Treatment Regimens Group No. 1 Number of Mice Male Female 33 Route P0 Duration (Days) 3 2 3 3 PO 3 3 3 3 PO 3 4 33 PO 3 5 3 3 PO 3 4/95 5 of 10 001353 PROTOCOL NO. 455, EDITION 17 C O R N IN G Hazleton The route of administration will be oral gavage. In the event that test article characteristics preclude oral gavage, IP injection will be employed. These routes of administration have been selected because they are the most common routes of administration for this test procedure. The dosing volume will not exceed 20 ml/kg for oral gavage and IP administrations. Other routes of administration that may be used are intravenous, intramuscular, sub-cutaneous administrations or by feed. The test material will generally be solubilized in one of the following solvents: water, 0.9Z saline, 0.5Z aqueous carboxymethylcellulose solution, or corn oil. All animals will be dosed based upon individual body weights. Dose levels will be assigned by a protocol amendment. Body weights will be taken prior to dosing. Dosing formulation will be prepared just prior to dosing. Dosing solutions will be prepared and held at ambient temperatures until dosing (0-2 hours). All animals will be euthanized 3 days after receiving a single dose. The animals will be observed daily for toxic signs and mortality for the duration of the study. Animals will be euthanized by C02 inhalation followed by penetration of the thorax. The daily observations of toxic symptoms and/or mortalities data will be used to estimate the Maximum Tolerated Dose (MTD). Doses will then be assigned for the subsequent cytogenetics assay. MICRONUCLEUS STUDY C . Dosing Schedule and Route of Administration Normally an acute dosing regimen (single administration) will be used (see Table below). Harvest will be approximately 24, 48, 72 hours after administration of the test article, and at approximately 24 hours after administration of the control articles. A total of 110 animals will be used. Equal numbers of males and females will be used at each treatment group. An additional group of animals consisting of 3-10 males and 3-10 females may be dosed as a secondary dose group with the high dose of the test material. This group will be dosed if toxicity is expected at the high dose and the animals in this group will only be used as replacements for any which die prior to euthanasia. The use of the secondary dose group will be determined by the study director. Freshly prepared solutions will be 4/95 6 of 10 001354 PROTOCOL NO. 455, EDITION 17 C O R N IN G Hazleton employed. The animals will be observed daily for toxic signs and mortality. NUMBER OF ANIMALS USED FOR MICRONUCLEUS ASSAY Group No. Treatment Harvest Times After Treatment (Males and Females) 24 Hours 48 Hours 72 Hours Total 1 Positive Control 5+5 -- -- 5+ 5 2 Vehicle Control 5+5 -- -- 5+ 5 3 Low Dose 5+5 5+ 5 5 + 5 15 + 15 4 Medium Dose 5+5 5+5 5 + 5 15 + 15 5 High Dose 5+5 5+ 5 5 + 5 15 + 15 TOTAL 25 + 25 15 + 15 15 + 15 55 + 55 The route of administration will be oral gavage. In the event that test article characteristics preclude oral gavage, IP injection will be employed. The dosing volume will not exceed 20 ml/kg. These routes of administration have been selected because they are the most common routes of administration for this test procedure. Other routes of administration that may be used are intravenous, intramuscular, sub-cutaneous administrations or by feed. D. Extraction of Bone Marrow Euthanasia will be with C02, followed by penetration of the thorax, and hind limb bones will be removed for marrow extraction. The marrow will be flushed from the bone and transferred to centrifuge tubes containing 3-5 ml bovine serum (one tube for each animal). E. Preparation of Slides Following centrifugation to pellet the tissue, the supernatant will be removed by aspiration and portions of the pellet will be spread on slides and air-dried. The slides will then be fixed in methanol, stained in May-Grunwald Solution and Giemsa, and protected by mounting with coverslips. For control of bias, all slides are coded for analysis. 4/95 7 of 10 001355 PROTOCOL NO. 455, EDITION 17 C O R N IN G Hazleton F. Scoring the Slides An attempt will be made to score one-thousand PCEs per animal. The frequency of micronucleated cells will be expressed as percent micronucleated cells based on the number of PCEs analyzed. The normal background frequency of micronuclei in the ICR mouse strain is around 0.0-0.4Z. The frequency of PCEs versus mature erythrocytes (NCEs ) will be determined by scoring the number of PCEs and NCEs observed in the optic fields while scoring the first 1000 erythrocytes on the slide. VI. DATA The criteria for the identification of micronuclei are those of Schmid (1976). Micronuclei are darkly stained and generally round, although almond and ring-shaped micronuclei occasionally occur. Micronuclei have sharp borders and are generally between 1/20 and 1/5 the size of The PCE. The unit of scoring is the micronucleated cell, not the micronucleus; thus the occasional cell with more than one micronucleus is counted as one micronucleated PCE, not two (or more) micronuclei. The staining procedure permits the differentiation by color of polychromatic and normochromatic erythrocytes (bluish-grey and red, respectively). Data Presentation The data reported will include the number of PCEs scored, the number of micronucleated PCEs, the percentage of micronucleated PCEs, and the ratio of polychromatic to normochromatic erythrocytes for each experimental animal. Evaluation Criteria The criteria for a positive response is a statistically significant dose-related increase in micronucleated PCEs, or the detection of a reproducible and statistically significant positive response for at least one dose level. A test article that induces neither a statistically significant dose response nor a statistically significant and reproducible increase at one dose level is considered negative. In either case, the final decision is based upon scientific judgement. 4/95 8 of 10 CO356 PROTOCOL NO. 455, EDITION 17 C O R N IN G Hazleton VII. TEST INTERPRETATION The analysis of this data will be performed using an analysis of variance (Winer, 1971) on either untransformed (when variances are homogeneous) or rank transformed (when variances are heterogeneous) proportions of cells with micronuclei per animal. If the analysis of variance is significant (p<0.05), a Dunnett's t-test (Dunnett, 1955; 1964) will be used to determine which dose groups, if any, are significantly different from the negative control. Analyses will be performed separately for each harvest time and sex combination. VIII. REFERENCES Dunnett, C.W.: A multiple comparisons procedure for comparing several treatments with a control. J. Am. Statist. Assoc., 50.:1096-1121, 1955. Dunnett, C.W.: New tables for multiple comparisons with a control. Biometrics, .20:482-491, 1964. Heddle, J.A., Hite, M . , Kirkhart, B., Larsen, K., MacGregor, J.T., Newell, G.W. and Salamone, M.F.: The induction of micronuclei as a measure of genotoxicity. Mutation Res., 123;61-118. 1983. Schmid, W. : The micronucleus test. Mutation Res., .31:9-15, 1975. Schmid, W. : The micronucleus test for cytogenetic analysis. In. Chemical Mutagens: Principles and Methods for Their Detection, Vol. 4 (A. Hollaender, ed.). Plenum, pp. 31-53, 1976. Winer, B.J.: Statistical Principles in Experimental Design, McGraw-Hill, New York, Second Edition, 1971. IX. REPORT FORMAT CHV employs a standard report format for each assay design. The final report will provide the following information. 4/95 Sponsor identification. Quality Assurance statement. Statement of GLP Compliance. Signature of study director. Test article identification and CHV Study Number. A physical description of the test article and date of receipt will be included in this section. Type of assay and protocol number. Dates of study initiation and completion. Study director and senior technician. Methods. 001357 9 of 10 PROTOCOL NO. 455, EDITION 17 C O R N IN G Hazleton Evaluation criteria. Interpretation of results. Conclusions. References. Test results presented in tabular form. X. CHANGES OR REVISIONS Any changes or revisions of this approved protocol will be documented, signed by the Study Director, dated, and maintained with this protocol. XI. ANIMAL CARE AND USE STATEMENT In the opinion of the Study Director, no alternative testing methods are appropriate, the study does not duplicate any previous work with this material, and the number and species selected are appropriate. This protocol will be reviewed by the CHV-IACUC for compliance with regulatory guidelines concerning the care and use of animals. If not in compliance, a modification will be required. Any changes or revisions of this approved protocol will be sent to the CHV-IACUC for their review. XII. RECORDS TO BE MAINTAINED All raw data, documentation, records, protocols, and the final report generated as a result of this study will be archived in the storage facilities of Coning Hazleton Inc. for at least one year following submission of the final report to the sponsor. After the one year period, the sponsor may elect to have the aforementioned materials retained in the storage facilities of Corning Hazleton Inc. for an additional period of time or sent to a storage facility designated by the sponsor. 001358 4/95 10 of 10 Corning Hazleton Ine. 9200 Leesburg Pike Vienna, Virginia 22192 io 99 '2/3 S93.54nr) 703 759.1.9^/ Fax April 25,1996 Steven C. Gordon, Ph.D., DABT 3M Medical Department Building 220-2E-02, 3M Center S t Paul, MN 55144-1000 C O R N IN G Hazleton ; r : ,3 V ' v i; RE: DRAFT REPORT AND PROTOCOL AMENDMENTS In Vivo Micronucleus Assay Protocol No.: 455CO, Ed. No.: 4, Modified for Sponsor Genetics Assay No.: 17384,17384-1 Test Material: T-6292 >/ Dear Dr. Gordon: Enclosed please find two (2) copies of the above referenced report. The report includes an unsigned Quality Assurance Statement and Compliance and Certification Statement, which will be signed upon issuance of the Final Report. Also enclosed is a copy of protocol amendments. The final report will be issued after your review and notification to us. Please contact the undersigned with any questions, comments, or necessary revisions at your earliest convenience. The report will be finalized after 1 year if no notification is received. Thank you for giving us this opportunity to work with you. Sincerely, CORNING Hazleton Hema Murli, Ph.D. Mammlian Cytogenetics Department of Genetic and Cellular Toxicology HM/paj enclosures C om ing P}if"rvi.?a:rr;cr4 SVrvic?* i- :.k A .'.t .: . J .< ; 001359 ) i .. AMENDMENT TO THE STUDY PROTOCOL STUDY TITLE: IN VIVO MOUSE MICRONUCLEUS ASSAY PROTOCOL NO.: 455, Edition 17 STUDY NO.: 17384-0-455 Page 1 of 1 Amendment #1 Section 2, Part V.B. The Sponsor has LD50data in rats of 1463 mg/kg solubilized in acetone/com oil mixture. Based on this information, the dose selection study will be conducted with acetone/com oil preparations testing dose groups of 0,1000, 1400, 1800, 2200, and 2600 mg/kg. STUDY DIRECTOR I 'I qjaa a h d L ih x KIaaaM Hemalatha Murli, Ph.D. Mammalian Cytogenetics Department of Genetic and Cellular Toxicology Date 001360 AMENDMENT TO THE STUDY PROTOCOL STUDY TITLE: IN VIVO MOUSE MICRONUCLEUS ASSAY PROTOCOL NO.: 455, Edition 17 STUDY NO.: 17384-0-455 Page 1 of 1 Amendment #2 Section 2, Part V.C. Based on the results of the results of the selection study, the mouse micronucleus assay will be conducted testing dose groups of 550, 1100, and 2200 mg/kg. A secondary dose group will be used. STUDY DIRECTOR Hemalatha Murli, Ph.D. Mammalian Cytogenetics Department of Genetic and Cellular Toxicology p<r/?6 Date 001361