title: Differential, histochemical and immunohistochemical changes in rat hepatocytes after isoflurane or sevoflurane exposure.
abstract: Differential, histochemical and immunohistochemical changes were observed in hepatocytes from immediately to 7 days after isoflurane or sevoflurane exposure (at H 0 to on Day 7) to study the process of development and recovery in anesthetic-induced hepatic injury. A total of 570 7-week-old male Sprague-Dawley rats with or without phenobarbital treatment were exposed to isoflurane or sevoflurane in 100%, 21%, or 10% oxygen, or to 10% oxygen alone for 2h. In phenobarbital-treated rats, hepatocytes both with and without anesthetic exposure markedly changed in 10% oxygen at H 0. Glycogen and ribosomal ribonucleic acid (rRNA) disappeared at H 0 and at H 6, respectively, and at H 6, AST levels in the blood rose. From H 6 to Day 1, necrosis developed more markedly and widely in zone 3 hepatocytes exposed to anesthetics in 10% oxygen than in those exposed to oxygen alone. All degenerated tissues had returned to normal levels by day 7. Recovery of the hepatolobular structure may be attributed to rearrangement of remaining hepatocytes in the portal vein area. Both the disappearance of glycogen and rRNA and the increase in blood AST levels after exposure to isoflurane or sevoflurane are considered to be factors contributing to the induction of necrosis around the central vein. The grade of isoflurane-induced hepatic injury was found to be significantly higher than that of sevoflurane.
authors.affiliation: Department of Cytology and Histology, Okayama University Graduate School of Medicine and Dentistry, Okayama 700-8558, Japan.
authors.forename: Mayumi
authors.initials: M
authors.lastname: Honda
authors.forename: Teruo
authors.initials: T
authors.lastname: Yamada
authors.forename: Takako
authors.initials: T
authors.lastname: Nomura
authors.forename: Yukari
authors.initials: Y
authors.lastname: Miki
authors.forename: Shigeto
authors.initials: S
authors.lastname: Kanda
authors.forename: Akihiko
authors.initials: A
authors.lastname: Seki
authors.forename: Junzou
authors.initials: J
authors.lastname: Sasaki
mesh_terms: D018685:Anesthetics, Inhalation / Q000009:adverse effects*; D000818:Animals; D006221:Halothane / Q000009:adverse effects; D022781:Hepatocytes / Q000737:chemistry / Q000187:drug effects*; D007150:Immunohistochemistry; D019570:Inhalation Exposure / Q000009:adverse effects; D007530:Isoflurane / Q000009:adverse effects*; D008112:Liver Glycogen / Q000378:metabolism; D008297:Male; D008738:Methyl Ethers / Q000009:adverse effects*; D012335:RNA, Ribosomal / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D000077149:Sevoflurane
chemical_list: D018685:Anesthetics, Inhalation; D008112:Liver Glycogen; D008738:Methyl Ethers; D012335:RNA, Ribosomal; D000077149:Sevoflurane; D007530:Isoflurane; D006221:Halothane