Effect of allyl alcohol on hepatic transporter expression: zonal patterns of expression and role of Kupffer cell function.
During APAP toxicity, activation of Kupffer cells is critical for protection from hepatotoxicity and up-regulation of multidrug resistance-associated protein 4 (Mrp4) in centrilobular hepatocytes. The present study was performed to determine the expression profile of uptake and efflux transporters in mouse liver following treatment with allyl alcohol (AlOH), a periportal hepatotoxicant. This study also investigated the role of Kupffer cells in AlOH hepatotoxicity, and whether changes in transport protein expression by AlOH are dependent on the presence of Kupffer cells. C57BL/6J mice received 0.1 ml clodronate liposomes to deplete Kupffer cells or empty liposomes 48 h prior to dosing with 60 mg/kg AlOH, i.p. Hepatotoxicity was assessed by plasma ALT and histopathology. Hepatic transporter mRNA and protein expression were determined by branched DNA signal amplification assay and Western blotting, respectively. Depletion of Kupffer cells by liposomal clodronate treatment resulted in heightened susceptibility to AlOH toxicity. Exposure to AlOH increased mRNA levels of several Mrp genes, while decreasing organic anion transporting polypeptides (Oatps) mRNA expression. Protein analysis mirrored many of these mRNA changes. The presence of Kupffer cells was not required for the observed changes in uptake and efflux transporters induced by AlOH. Immunofluorescent analysis revealed enhanced Mrp4 staining exclusively in centrilobular hepatocytes of AlOH treated mice. These findings demonstrate that Kupffer cells are protective from AlOH toxicity and that induction of Mrp4 occurs in liver regions away from areas of AlOH damage independent of Kupffer cell function. These results suggest that Kupffer cell mediators do not play a role in mediating centrilobular Mrp4 induction in response to periportal damage by AlOH.
Toxicology Program, Department of Pharmaceutical Sciences, School of Pharmacy, University of Connecticut, 69 North Eagleville Road, Unit 3092, Storrs, CT 06269-3092, USA.
Sarah N
SN
Campion
Cristina
C
Tatis-Rios
Lisa M
LM
Augustine
Michael J
MJ
Goedken
Nico
N
van Rooijen
Nathan J
NJ
Cherrington
José E
JE
Manautou
D000410:Alanine Transaminase / Q000097:blood; D000818:Animals; D015153:Blotting, Western; D004002:Clodronic Acid / Q000008:administration & dosage; D005455:Fluorescent Antibody Technique; D005786:Gene Expression Regulation / Q000187:drug effects; D007274:Injections, Intraperitoneal; D007275:Injections, Intravenous; D007728:Kupffer Cells / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D008081:Liposomes; D008099:Liver / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D027361:Organic Anion Transporters / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D020005:Propanols / Q000008:administration & dosage / Q000633:toxicity*; D012333:RNA, Messenger / Q000378:metabolism; D013997:Time Factors
D000410:Alanine Transaminase; D004002:Clodronic Acid; D008081:Liposomes; D027425:ATP-Binding Cassette, Sub-Family C Proteins; D027361:Organic Anion Transporters; D020005:Propanols; D012333:RNA, Messenger; C489540:Abcc4 protein, mouse; C006463:allyl alcohol