Impact of estradiol on parametrial adipose tissue function: evidence for establishment of a new set point of leptin sensitivity in control of energy metabolism in female rat
Details
Serval ID
serval:BIB_8C70ED5AAB6A
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Impact of estradiol on parametrial adipose tissue function: evidence for establishment of a new set point of leptin sensitivity in control of energy metabolism in female rat
Journal
Endocrine
ISSN
0969-711X (Print)
Publication state
Published
Issued date
04/2003
Volume
20
Number
3
Pages
239-45
Notes
Journal Article
Research Support, Non-U.S. Gov't --- Old month value: Apr
Research Support, Non-U.S. Gov't --- Old month value: Apr
Abstract
Estradiol has been implicated in the regulation of food intake; however, its effect seems to be exerted in a bimodal fashion. We examined whether a single im injection of estradiol valerate (E2V), lastingly effective, could induce changes in parametrial fat function that further induce a new set point of leptin sensitivity in the female rat. E2V induced severe anorexia and loss of body weight between d 4 and 12 posttreatment. E2V rats recovered normal food intake and departing body weights on wk 2 and 3 posttreatment, respectively; however, they did not reach body weights of control rats. On d 61 posttreatment, we found that unfasting E2V, vs control, rats displayed increased E2 and leptin circulating levels; reduced plasma tumor necrosis factor-alpha(TNF-alpha) concentrations; similar circulating levels of glucose, insulin, and triglyceride; and lower parametrial fat mass containing a higher number of adipocytes that, although normal in size, in vitro released more leptin. Metabolic responses to fasting indicated that unlike control animals, E2V rats did not decrease triglyceride circulating levels, and that both groups decreased plasma glucose, leptin, and insulin, but not TNF-alpha, levels. High glucose load experiments indicated that E2V animals displayed a better insulin sensitivity than control rats; did not significantly increase circulating leptin concentrations as control rats did; and, unlike control, significantly decreased plasma triglyceride levels. Our data strongly support a potent acute anorectic effect of E2 and that, after several weeks, E2 modified parametrial fat function and insulin sensitivity, protecting the organism against future unfavorable metabolic conditions.
Keywords
Adipocytes/drug effects
Adipose Tissue/cytology/*drug effects
Animals
Blood Glucose/metabolism
Body Weight/drug effects
Eating/drug effects
Endometrium/drug effects
Energy Metabolism/drug effects
Estradiol/*analogs & derivatives/*pharmacology
Fasting/metabolism
Female
Glucose/pharmacology
Rats
Rats, Sprague-Dawley
Triglycerides/blood
Pubmed
Web of science
Create date
15/02/2008 17:57
Last modification date
20/08/2019 15:50