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Regulation of succinyl-CoA:3-oxoacid CoA-transferase in developing rat brain: responsiveness associated with prenatal but not postnatal hyperketonemia.

Abstract：

:Activities of ketone body-metabolizing enzymes in rat brain rise 3- to 5-fold during the suckling period, then fall more than 50% after weaning. Our purpose was to determine the mechanism of the developmental changes in activity of 3-oxoacid CoA-transferase in rat brain and to study its regulation by dietary modification. Purified rat brain 3-oxoacid CoA-transferase was used to generate specific antibody. Immunotitrations of the enzyme from brains of 4-, 24-, and 90-day-old rats indicated that changes in 3-oxoacid CoA-transferase activity during development are due to changes in content of the enzyme protein. Pulse-labeling studies showed that changes in enzyme specific activity reflected changes in its relative rate of synthesis, which increased 2.5-fold between the nineteenth day of gestation and the third postnatal day, remained at this high level until the twelfth postnatal day, and declined thereafter, returning by Day 38 to the level observed in utero. The enzyme is apparently degraded very slowly during early postnatal life. Fetal hyperketonemia induced by feeding pregnant rats a high-fat diet was associated with an increase in the relative rate of synthesis of 3-oxoacid CoA-transferase in brains of 19-day-old fetuses and newborn rats and with an increase in the specific activity of the enzyme at birth. To examine the role of postnatal hyperketonemia in the development of the enzyme in brains of suckling rats, neonates received intragastric cannulas and were fed, for up to 13 days, a modified milk formula low in fat. Postnatal hyperketonemia was abolished but cerebral 3-oxoacid CoA-transferase specific activity on Days 10 and 17 was not significantly affected. Thus, the physiological hyperketonemia caused by the high fat content of rat milk is not required for the normal development of 3-oxoacid CoA-transferase in rat brain.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Haney PM,Patel MS

doi

10.1016/0003-9861(85)90047-5

subject

Has Abstract

pub_date

1985-07-01 00:00:00

pages

426-34

issue

1

eissn

0003-9861

issn

1096-0384

pii

0003-9861(85)90047-5

journal_volume

240

pub_type

杂志文章

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