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• W2107792357 abstract "Mitochondria from intact follicles (4–7 mm) and corpora lutea of porcine ovaries were isolated and compared with respect to their abilities to utilize various oxidizable substrates to support ATP and pregnenolone syntheses. The oxidizable substrates studied were isocitrate, citrate, malate and succi.nate (Kreb’s cycle intermediates), acetyl carnitine and paimitoyl carnitine (representative short and long chain fatty acids, respectively) and pyruvate (an intermediate of glucose metabolism). While there is an overall higher rate of ATP synthesis by luteal mitochondria, the increase in the utilization of certain substrates is especially dramatic. Palmitoyl carnitine and acetyl carnitine support ATP synthesis almost fivefold better in luteal preparations than in follicular mitochondria (120 vs. 25 nmol/min per mg protein), while isocitrate and citrate are eight times better (240 vs. 30 nmol/min per mg protein). It appears that fatty acids are poorly utilized by follicular mitochondria to support ATP synthesis, but are good substrates in luteal mitochondria. The inability of follicular mitochondria to utilize isocitrate to support ATP synthesis is not due to a lack of isocitrate dehydrogenase activity, since the activities of both the NAD+-dependent and NADP+-dependent forms in follicular mitochondria are not significantly different than the corresponding activities in luteal mitochondria. With follicular mitochondria there are no significant differences between the rates of pregnenolone synthesis supported by various substrates (approximately 40 pmol/min per mg protein). While the rates of pregnenolone synthesis by luteal mitochondria also do not differ significantly with the various oxidizable substrates, the rates by luteal mitochondria are fiveto tenfold higher than the corresponding rates by follicular mitochondria. In summary, these studies show that luteal mitochondria have a greater ability to utilize fatty acids and isocitrate and citrate than do follicular mitochondria. In addition, while the rate of ATP synthesis varies with the oxidizable substrate utilized, pregnenolone synthesis requires an oxidizable substrate but does not exhibit any preference." @default.
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• W2107792357 date "1983-02-01" @default.
• W2107792357 modified "2023-09-23" @default.
• W2107792357 title "Differences in Pregnenolone and Adenosine Triphosphate Syntheses Between Mitochondria from Follicles and Corpora Lutea of Porcine Ovaries" @default.
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• W2107792357 doi "https://doi.org/10.1095/biolreprod28.1.142" @default.
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