Effect of diabetes, adrenalectomy and hypophysectomy on D-3-hydroxybutyrate dehydrogenase activity and substrate oxidation by rat mitochondria.
In good agreement with previous observations, D-3-hydroxybutyrate dehydrogenase (OHBD) activity in disrupted liver mitochondria decreased significantly in chronic diabetic rats, whereas insulin treatment prevented this decrease. Similar effects were observed with kidney mitochondria. Adrenalectomy increased OHBD activity in liver and brain mitochondria from normal rats and in liver mitochondria from diabetic rats. Corticosterone depressed OHBD activity in liver mitochondria of normal rats and restored the normal level of OHBD in adrenalectomized rats. Hypophysectomy increased OHBD activity in normal rats, this effect being further increased by growth hormone administration. D-3-hydroxybutyrate (OHB) oxidation by liver mitochondria from diabetic, adrenalectomized or hypophysectomized rats varied as expected from OHBD activity in disrupted mitochondria, but to a relatively lesser degree. Submitochondrial particles from diabetic rats showed significant diminution in OHB-, succinate- and NADH-oxidase activities, whereas mitochondria from diabetic rats oxidized succinate and L-malate + L-glutamate at a slower rate than the corresponding controls.
PubMed Abstracts
PubMed Abstracts