期刊
CELL BIOCHEMISTRY AND BIOPHYSICS
卷 43, 期 1, 页码 87-94出版社
HUMANA PRESS INC
DOI: 10.1385/CBB:43:1:087
关键词
rat heart; postnatal development; cytochrome-c oxidase; mitochondria; detergent
Cytochrome-c oxidase (COX) activity of the rat heart was two- to sevenfold activated when the membrane integrity was disrupted by hypotonic swelling, freezing-thawing, or a detergent, indicating that a large portion of COX capacity in intact mitochondria is not active. The effect of detergent was tested in heart mitochondria isolated from 1-, 5-, 15-, 29-, and 60-d-old rats; activation by detergent was up to 20-fold in 1-d-old animals, whereas in mitochondria from 60-d-old rats it was only 7-fold. Our data indicate that the rat heart exhibits significant developmental changes dependent on downregulation of COX activity in the neonatal period.
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