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Short-term treatment with estrone oleate in liposomes (Merlin-2) does not affect the expression of the ob gene in Zucker obese rats.

Abstract：

:Young female Zucker fa/fa rats of 370-430 g were implanted with osmotic minipumps releasing 3.5 micromol/day-kg of estrone oleate in liposomes (Merlin-2) into the bloodstream for up to 14 days. Merlin-2 induced a sustained loss of appetite, and a decrease in body weight of 3.5%, which contrasts with the 8.2% increase in controls during the period studied. Plasma insulin, glucose and urea decreased, and liver glycogen increased with Merlin-2 treatment. Plasma ACTH and corticosterone increased to a maximum at the end of the experiment. The expression of the ob gene in adipose tissue was unchanged, and plasma leptin levels were also unchanged by treatment. Estrone levels increased more than 1500-fold, and estrone oleate rose 100-fold during treatment. The fact that estrone oleate had no effect on the leptin levels or expression in obese rats, in contrast with the marked inhibition observed in the lean suggests that the functionality of the leptin receptor is essential for estrone oleate inhibition of the ob gene. This also suggests that leptin may control ob gene expression in white adipose tissue and that estrone oleate may activate this process. The slimming effect of estrone oleate is, thus, not directly dependent on leptin, since both normoleptinemic and hyperleptinemic animals lose fat following treatment nor are the effects on appetite and energy expenditure mediated by leptin. However, leptin levels and the expression of the ob gene are directly linked with estrone oleate function. A possible involvement of leptin in estrone oleate action is postulated. The results support the participation of estrone oleate in the control of body weight and hint at the complexity of its regulation by leptin and glucocorticoids.

journal_name

Mol Cell Biochem

journal_title

Molecular and cellular biochemistry

authors

Adán C,Grasa MM,Cabot C,Esteve M,Vilà R,Masanés R,Estruch J,Fernández-López JA,Remesar X,Alemany M

doi

10.1023/a:1006987115532

keywords:

subject

Has Abstract

pub_date

1999-07-01 00:00:00

pages

109-15

issue

1-2

eissn

0300-8177

issn

1573-4919

journal_volume

197

pub_type

杂志文章

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Short-term treatment with estrone oleate in liposomes (Merlin-2) does not affect the expression of the ob gene in Zucker obese rats.