mortality/aging
N |
• unlike mice homozygous for a null allele, mice homozygous for a truncated allele are born at the expected numbers
|
homeostasis/metabolism
N |
• exercise endurance is similar to controls
• hepatic gluconeogenesis is not impaired
|
• impaired glucose-stimulated insulin secretion in isolated pancreatic islets
|
• significantly greater blood glucose excursion following pyruvate injection
|
• at baseline and 30 minutes after glucose injection
|
• increased lactate levels
• following pyruvate injection the decline in blood lactate is slower compared to wild-type controls
• during a glucose tolerance test, blood lactate levels are increased
|
• 25%-30% lower rates of pyruvate/malate-stimulated respiration in isolated mitochondria in 2,4-dinitrophenol-uncoupled conditions compared to mitochondria from wild-type mice
• addition of methyl-pyruvate rescues oxygen consumption and maximal oxygen consumption with glutamate/malate or succinate/rotenone are similar to controls
|
cellular
• increased 13C-labeled plasma lactate levels indicate decreased mitochondrial pyruvate metabolism in extrahepatic tissues
|
endocrine/exocrine glands
• impaired glucose-stimulated insulin secretion in isolated pancreatic islets
|