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Regional Induction of CYP1A1 in Rat Liver Following Treatment with Mixtures of PCB 126 and PCB 153
Laura S. Chubb
Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523-1680, USA
Melvin E. Andersen
CT-Centers for Health Research, Research Triangle Park, North Carolina 27709, USA
Carolyn J. Broccardo
Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523-1680, USA
Marie E. Legare
Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523-1680, USA
Ruth E. Billings
Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523-1680, USA
Charles E. Dean
Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523-1680, USA
William H. Hanneman
Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado 80523-1680, USA, Hanneman{at}colostate.edu
Liver enzyme induction has been shown previously to be regional with clear borders between induced and uninduced regions in vivo, and cells either fully induced or not induced in vitro. The current study examined this phenomenon in vivo by evaluating enzyme induction after exposure to PCB 126 and PCB 153 in female Fisher 344 (F344) and male Sprague—Dawley (SD) rats. IHC revealed a regional induction of CYP1A1 after exposure to PCB 126, apparent in the centrilobular region at lower doses and progressing to panlobular with higher doses. PCB 153 exposure induced CYP2B1/2 in the centrilobular region, which spread to the midzonal region as the dose increased, but never became panlobular even at the highest dosage tested. In rats treated with PCB 126 in combination with high doses of PCB 153, induction of CYP1A1 occurred preferentially in the periportal region, a reversal from the pattern seen with PCB 126 alone. This CYP1A1 induction pattern reversal is a unique example of complex biological interactions between coplanar (PCB 126) and noncoplanar (PCB 153) halogenated aromatic hydrocarbons.
Key Words: PCB 126 • PCB 153 • Liver • Cytochrome P450 1A1 • Coplanar • Noncoplanar • Mixtures • Cytochrome P450 2B1/2.
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Toxicologic Pathology, Vol. 32, No. 4,
467-473 (2004)
DOI: 10.1080/01926230490483306
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