title: The role of heme oxygenase-1 in drug metabolizing dysfunction in the alcoholic fatty liver exposed to ischemic injury.
abstract: This study was designed to investigate the role of heme oxygenase-1 (HO-1) in hepatic drug metabolizing dysfunction after ischemia/reperfusion (IR) in alcoholic fatty liver (AFL). Rats were fed a Lieber-DeCarli diet for five weeks to allow for development of AFL and were then subjected to 90min of hepatic ischemia and 5h of reperfusion. Rats were pretreated with hemin (HO-1 inducer) or ZnPP (HO-1 inhibitor) for 16h and 3h before hepatic ischemia. After hepatic IR, ethanol diet (ED)-fed rats had higher serum aminotransferase activities and more severe hepatic necrosis compared to the control diet (CD)-fed rats. These changes were attenuated by hemin and exacerbated by ZnPP. The activity and gene expression of HO-1 and its transcription factor (Nrf2) level increased significantly after 5h of reperfusion in CD-fed rats but not in ED-fed rats. After reperfusion, cytochrome P450 (CYP) 1A1, 1A2, and 2B1 activities were reduced to levels lower than those observed in sham group, whereas CYP2E1 activity increased. The decrease in CYP2B1 activity and the increase in CYP2E1 activity were augmented after hepatic IR in ED-fed animals. These changes were significantly attenuated by hemin but aggravated by ZnPP. Finally, CHOP expression and PERK phosphorylation, microsomal lipid peroxidation, and levels of proinflammatory mediators increased in ED-fed rats compared to CD-fed rats after reperfusion. These increases were attenuated by hemin. Our results suggest that AFL exacerbates hepatic drug metabolizing dysfunction during hepatic IR via endoplasmic reticulum stress and lipid peroxidation and this is associated with impaired HO-1 induction.
authors.affiliation: Department of Pharmacology, Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 52727, Republic of Korea.
authors.forename: Sang Won
authors.initials: SW
authors.lastname: Park
authors.affiliation: School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea.
authors.forename: Jung-Woo
authors.initials: JW
authors.lastname: Kang
authors.affiliation: School of Pharmacy, Sungkyunkwan University, Suwon, Gyeonggi-do 16419, Republic of Korea. Electronic address: sunmee@skku.edu.
authors.forename: Sun-Mee
authors.initials: SM
authors.lastname: Lee
mesh_terms: D000818:Animals; D000431:Ethanol / Q000008:administration & dosage / Q000633:toxicity*; D005235:Fatty Liver, Alcoholic / Q000201:enzymology* / Q000473:pathology; D006419:Heme Oxygenase (Decyclizing) / Q000502:physiology*; D007511:Ischemia / Q000139:chemically induced / Q000201:enzymology* / Q000473:pathology; D008099:Liver / Q000098:blood supply* / Q000201:enzymology* / Q000473:pathology; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D000431:Ethanol; D006419:Heme Oxygenase (Decyclizing); C491523:Hmox1 protein, rat
keywords: Alcoholic fatty liver; Cytochrome P450 isozymes; Endoplasmic reticulum stress; Heme oxygenase-1; Hepatic ischemia/reperfusion; Oxidative stress