Changes in Lipolytic Activity of Isolated Adipocytes from Rats throughout Life Span
作者:
Adrienne Gommers,
Danielle Caucheteux,
Monique Delhaye,
Angelos C. Economos,
期刊:
Gerontology
(Karger Available online 1985)
卷期:
Volume 31,
issue 2
页码: 76-83
ISSN:0304-324X
年代: 1985
DOI:10.1159/000212684
出版商: S. Karger AG
关键词: Adipocyte;Epinephrine;Glycerol release;Lipolytic response;Rat
数据来源: Karger
摘要:
The lipolytic response of isolated adipocytes from 1 ½-, 6-, 24- and 32-month-old rats to various doses of epinephrine was studied. Both the basal and the maximal stimulated glycerol release were largest in the mature rats (6 months old) which had the largest adipocytes. Expressing glycerol release per unit cell surface area (which was drastically reduced with age) eliminated the difference between mature and senescent rats both in absence of epinephrine and at high doses of the hormone. However, at low epinephrine doses the adipocytes of the very young and the very old rats showed an enhanced response per unit surface area. A simple pharmacodynamic analysis based on the occupancy theory of drug-receptor interaction suggests that the sensitivity of rat adipocyte receptors is increased during senescence; this increase may be related to the decreased surface of old adipocytes. On the other hand, the decreased maximal lipolytic response during senescence may be due in part to a reduced number of receptors and to a reduced sensitivity of the cellular enzymatic system underlying lipolysis
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