Kinetic properties of bilirubin UDP-glucuronyltransferase in squirrel monkeys exhibiting fasting hyperbilirubinemia.
1. Bolivian squirrel monkeys (BoSM), unlike Brazilian squirrel monkeys (BrSM), exhibit a marked fasting hyperbilirubinemia (FH) and serve as animal models for Gilbert's syndrome type I. 2. Compared to BrSM, BoSM possess a higher apparent UDPGAKm (0.51 vs 0.29 mM) and lower Vm (0.36 vs 0.48 nmol BR conjugated/min per mg microsomal protein) for hepatic bilirubin (BR) UDP-glucuronyl-transferase (BR UDPG-T). 3. Lineweaver-Burk plots are linear and obey Michaelis-Menten kinetics when UDP-acetylglucosamine is used as activator and UDPGA substrate concentrations are within the physiologic range present in the liver during the fed and fasted state (0.10-0.71 mM); above these concentrations, there is a discontinuity of kinetic plots as noted in other species. 4. There is no effect of fasting on the Km of BR conjugation (i.e. sum of mono- and diglucuronides) in either monkey; however, fasting is associated with lower Vm values (15-20%) in each subspecies. 5. By calculating the potential BR flux (nmol BR conjugated/min per kg) using known hepatic UDPGA concentrations, liver weights and in vitro Km and Vm, a markedly lower BR flux is observed in BoSM (58.4 nmol/min per kg) than in BrSM (91.6 nmol/min per kg). 6. Significantly higher apparent UDPGAKm and lower Vm of BR UDPG-T for conjugation of BR to BR monoglucuronide appears responsible in part for the four- to five-fold elevations in unconjugated BR in the liver and plasma in the fasted BoSM.
Freedland
R A
RA
Department of Physiological Sciences, School of Veterinary Medicine, University of California, Davis 95616.
Smith
C A
CA
Bruss
M L
ML
Cornelius
C E
CE
D000818:Animals; D001663:Bilirubin / Q000378:metabolism; D005215:Fasting; D005260:Female; D014453:Glucuronosyltransferase / Q000378:metabolism*; D006932:Hyperbilirubinemia / Q000201:enzymology*; D007700:Kinetics; D008297:Male; D012453:Saimiri; D014537:Uridine Diphosphate N-Acetylglucosamine / Q000378:metabolism
D014537:Uridine Diphosphate N-Acetylglucosamine; D014453:Glucuronosyltransferase; D001663:Bilirubin