title: Deceleration of regenerative response improves the outcome of rat with massive hepatectomy.
abstract: Small residual liver volume after massive hepatectomy or partial liver transplantation is a major cause of subsequent liver dysfunction. We hypothesize that the abrupt regenerative response of small remnant liver is responsible for subsequent deleterious outcome. To slow down the regenerative speed, NS-398 (ERK1/2 inhibitor) or PD98059 (selective MEK inhibitor) was administered after 70% or 90% partial hepatectomy (PH). The effects of regenerative speed on liver morphology, portal pressure and survival were assessed. In the 70% PH model, NS-398 treatment suppressed the abrupt replicative response of hepatocytes during the early phase of regeneration, although liver volume on day 7 was not significantly different from that of the control group. Immunohistochemical analysis for CD31 (for sinusoids) and AGp110 (for bile canaliculi) revealed that lobular architectural disturbance was alleviated by NS-398 treatment. In the 90% PH model, administration of NS-398 or PD98059, but not hepatocyte growth factor, significantly enhanced survival. The abrupt regenerative response of small remnant liver is suggested to be responsible for intensive lobular derangement and subsequent liver dysfunction. The suppression of MEK/ERK signaling pathway during the early phase after hepatectomy makes the regenerative response linear, and improves the prognosis for animals bearing a small remnant liver.
authors.affiliation: Department of Surgery and Science, Kyushu University, Fukuoka, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Ninomiya
authors.forename: K
authors.initials: K
authors.lastname: Shirabe
authors.forename: T
authors.initials: T
authors.lastname: Terashi
authors.forename: H
authors.initials: H
authors.lastname: Ijichi
authors.forename: Y
authors.initials: Y
authors.lastname: Yonemura
authors.forename: N
authors.initials: N
authors.lastname: Harada
authors.forename: Y
authors.initials: Y
authors.lastname: Soejima
authors.forename: A
authors.initials: A
authors.lastname: Taketomi
authors.forename: M
authors.initials: M
authors.lastname: Shimada
authors.forename: Y
authors.initials: Y
authors.lastname: Maehara
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000627:therapeutic use; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000037:antagonists & inhibitors; D005419:Flavonoids / Q000627:therapeutic use; D006498:Hepatectomy / Q000379:methods* / Q000401:mortality; D007150:Immunohistochemistry; D008099:Liver / Q000033:anatomy & histology* / Q000166:cytology / Q000187:drug effects; D008115:Liver Regeneration / Q000187:drug effects / Q000502:physiology*; D016031:Liver Transplantation / Q000502:physiology; D008297:Male; D009578:Nitrobenzenes / Q000627:therapeutic use; D009929:Organ Size; D051381:Rats; D017208:Rats, Wistar; D013449:Sulfonamides / Q000627:therapeutic use; D015996:Survival Rate; D013997:Time Factors
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D005419:Flavonoids; D009578:Nitrobenzenes; D013449:Sulfonamides; C080955:N-(2-cyclohexyloxy-4-nitrophenyl)methanesulfonamide; D017871:Calcium-Calmodulin-Dependent Protein Kinases; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one