Dr. Timothy R. Zacharewski

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Michigan State University
College of Natural Science
Biochemistry
Assistant ProfessorAppointed: 1997

Mailing Address

241 Food Safety and Toxicology Bldg or 223 Biochemistry Bldg
National Food Safety and Toxicology Center
Michigan State University
East Lansing, Michigan 48824
United States

Contact Information

Phone: (517) 355-1607
Fax: (517) 432-2310
tzachare@pilot.msu.edu
http://www.bch.msu.edu

Qualifications

Ph.D., Texas A&M University, Toxicology, 1990.
B.S., University of Guelph, Ontario, Canada, Chemistry with Microbiology Emphasis, 1986.

Expertise and Research Interests

RECEPTOR MEDIATED TOXICOLOGY:
In my laboratory, the primary focus is on mechanistic toxicology which evolves elucidating how a chemical elicits its adverse effects. More, specifically, we are interested in exploring how chemicals cause changes in gene expression that result in hormone-dependent cancers and compromised reproductive fitness. Research efforts are currently divided into the following two areas:

1.--ENDOCRINE DISRUPTION--examine receptor-mediated endocrine disrupting activities of chemicals and natural products in humans and wildlife.

2.--TOXICOGENOMICS--assess the effects of developmental exposure to endocrine disruptors on fertility and reproductive tissue gene expression profiles using gene expression array technology developed asa result of the Human Genome Project.

Other Expertise

Postdoctoral Training - INSERM U.184, CNRS-LGME, Institut de Chimie Bioloique-Faculte de Medecine, 11, Rue Humann, 67085 Strasbourg, France--Medical Research Council of Canada (MRC) Postdoctoral Fellow

Continuing education:
1988-1989--Concepts inTumorBiology I ans II, University of Texas System Cancer Center, Science Park-Research Division at Smithville, TX

1988--Molecular Endocrinology Workshop, Department of Cell Biology, Baylor College of Medicine, Houston, TX

1988--Recombinant DNA Techniques Workshop, Bethesda Research Laboratories-Life Technologies, Inc., Huntsville, TX

1992--Molecular Yeast Genetics, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY

1992--EMBO Molecular Genetics of Yeast, Biozentrum, Basil, Switzerland

1993--PCR Techniques, Catholic University of America, Washington, DC

1994--The Use of Molecular Biology in Toxicology, 33rd Society of Toxicology Annual Meeting, Dallas, TX

1995--New Endpoints in Development and Reproductive Regulatory Studies:MethodsforSuccess, Continuing Education Course, 34th Society of Toxicology Annual Meeting, Baltimore, MD

1996--Applications of PCR Technologies to Molecular Toxicology, 35th Society of Toxicology Annual Meeting, Anaheim, CA

1996--The Female reproductiveSystem-How to Assess Potential Toxicity, 35th Society of Toxicology Annual Meeting, Anaheim, CA

Faculty Development:
1995--Teaching at the University Level. Educational Development Office, University of Western Ontario, London, Ont.

1998--ProblemBased Learning (PBL) Faculty Development Workshop, College of Human Medicine, Michigan State University

Future Research

Comparative in vitro and in vivo gene expresion profiles elicited by pharmaceuticals, natural products, undustriasl chemicals, pesticides and environmental contaminants found in food using human, mouse and rat microarray technologies.

Keywords

COS Keywords:

Biochemistry, Food Safety, Gene Expression, Toxicology.

Additional Terms:

Food Safety.

Memberships

Canadian Network of Toxicology Centres
Society of Environmental Toxicology and Chemistry
Society of Toxicology
Society of Toxicology of Canada
U.S. EPA Microarray Consortium (EOAMAC)

Previous Positions

1997-1998, Associate Professor, University of Western Ontario, Pharmacology and Toxicology, Pharmaceutical Manufacturers Associaton of Cananda/Health Re
1992-1997, Assistant Professor, University of Western Ontario, Pharmacology and Toxicology, Pharmaceutical Manufacturers Association of Canada/Health Re

Funding Received

  • Environmental Protection Agency (EPA): Developmental Exposure to Endocrine Disruptors: Fertility and Gene Expression, 9/1/99 to 8/31/03.
  • American Chemistry Council: Impact of Synthetic Xenoestrogen Mixtures Relative to Background Phytoestrogen Exposures, 9/1/98 to 5/31/04.
  • National Institutes of Health (NIH): Ah Receptor Mediated Ligand Toxicity, 6/1/03 to 5/31/06.
  • National Institutes of Health (NIH): Comprehensive Assessment of Endocrine-Active Mixtures, 5/1/01 to 4/30/04.
  • National Institutes of Health (NIH): Epigenetic Effects of Pre- and Post-Remediation Environmental Toxicants on the Inter- and Intracellular Communication Pathways Controlling Gene Expression, Cell Proliferation, Differentiation and Apoptosis in Human Neuronal Stem Cells, 5/1/00 to 4/30/05.

Publications

  • Fielden, M.R., Halgren, R.G., Fong, C., Staub, C., Johnson, L., Chou, K., and Zacharewski, T, Gestational and lactational exposure of male mice to diethylstilbestrol causes long-term effects on the testis, sperm fertilizing ability in vitro, and testicular gene expression, Endocrinology, 143(8), 3044-3059, 2002
  • Matthews J.B., Fertuck K, Celius T., Huang Y-W. and Zacharewski T, Differential interactions of estrogenic chemicals with estrogen receptors from several different species, Journal of Steroid Biochemistry and Molecular Biology, 82, 181-194, 2002
  • Fielden, M.R., Samy, S., Chou, K. and Zacharewski, T, Effect of human exposure levels of genistein during gestation and lactation on reproductive development and sperm quality in mice, Food Chemistry and Toxicology, 41, 447-454, 2002
  • Fielden, M.R., Halgren, R.H., Dere, E. and Zacharewski, T, GP3: GenePix post-processing script for the automated analysis of raw microarray image output files, Bioinformatics, 18, 771-773, 2002
  • Fielden, M.R., Fertuck, K.C., Matthews, J.B., Halgren, R. and Zacharewski, T, In silico approaches to mechanistic and predictive toxicology: an introduction to bioinformatics for toxicologists, Critical Reviews in Toxicology, 32(2), 67-112, 2002
  • Halgren, R.G., Fielden, M.R., Fong, C.J. and Zacharewski, T.R., Assessment of clone identity and sequence fidelity for 1189 IMAGE cDNA clones, Nucleic Acids Research, 29(2), 582-588, 2002
  • Zacharewski T, Identification and assessment of endocrine disruptors: limitations of in vivo and in vitro assays., Environmental Health Perspectives, 106 Suppl 2, 577-82, 1998 Abstract
  • Fielden MR, Chen I, Chittim B, Safe SH, Zacharewski TR, Examination of the estrogenicity of 2,4,6,2',6'-pentachlorobiphenyl (PCB 104), its hydroxylated metabolite 2,4,6,2',6'-pentachloro-4-biphenylol (HO-PCB 104), and a further chlorinated derivative, 2,4,, Environmental Health Perspectives, 105(11), 1238-48, November 1997 Abstract
  • Gillesby BE, Stanostefano M, Porter W, Safe S, Wu ZF, Zacharewski TR, Identification of a motif within the 5' regulatory region of pS2 which is responsible for AP-1 binding and TCDD-mediated suppression, Biochemistry, 36(20), 6080-9, May 1997 Abstract

Profile Details

Last Updated: 7/16/2003

COS Expertise ID #454698
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