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1 Grup de Metabolisme Energetic i Nutricio, Departament de Biologia Fonamental i Ciencies de la Salut, Institut Universitari d' Investigacio en Ciencies de la Salut (IUNICS), Universitat de les Illes Balears, Palma de Mallorca, Spain
* To whom correspondence should be addressed. E-mail: pilar.roca{at}uib.es.
Sex hormones play an important role in adipose tissue metabolism by activating
specific receptors that alter several steps of the lipolytic and lipogenic signal cascade in
a depot and gender dependent manner. However, studies focusing on steroid receptor
status in adipose tissue are scarce. In the present study, we analyzed steroid content
(testosterone, 17
-estradiol and progesterone) and its steroid receptor mRNA levels in
different rat adipose tissue depots. As expected, testosterone levels were higher in
males compared to females (p=0.031), while the reverse trend was observed for
progesterone (p<0.001). It is noteworthy that estradiol adipose tissue levels were
higher in inguinal than the rest of adipose tissues for both genders, where no sex
differences in 17
-E2 tissue levels were noted (p=0,010 respect retroperitoneal,
p=0.005 respect gonadal and p=0.018 respect mesenteric). Regarding steroid receptor
levels, both AR, ER
and ER
receptor densities were more clearly dependent on
adipose depot location rather than gender, with visceral depots showing an overall
higher mRNA densities than their subcutaneous counterparts. Besides, expression of
ER
predominated over ER
expression, and progesterone receptor (PR-B form and
PR-A+B form) mRNAs were identically expressed regardless of the anatomic depot
and the gender. In vitro studies in 3T3-L1 cells showed that estradiol increased ER
(p=0.001) and AR expression (p=0.001), indicating that estrogen can alter both
estrogenic and androgenic signalling in adipose tissue. The results highlighted in this
study demonstrate important depot dependent differences in the sensitivity of adipose
tissues to sex hormones between visceral and subcutaneous depots that could be
related to metabolic situations observed in response to sex hormones.
This article has been cited by other articles:
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M. Monjo, E. Pujol, and P. Roca {alpha}2- to {beta}3-Adrenoceptor switch in 3T3-L1 preadipocytes and adipocytes: modulation by testosterone, 17{beta}-estradiol, and progesterone Am J Physiol Endocrinol Metab, July 1, 2005; 289(1): E145 - E150. [Abstract] [Full Text] [PDF] |
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