Sex Steroid Receptor Expression Profile in Brown Adipose Tissue. Effects of Hormonal Status
Male
0301 basic medicine
Receptors, Steroid
Sex Characteristics
Gene Expression Profiling
Rats
Mice
03 medical and health sciences
Adipose Tissue, Brown
Gene Expression Regulation
Receptors, Estrogen
Pregnancy
Receptors, Androgen
Animals
Lactation
Female
RNA, Messenger
Rats, Wistar
Gonadal Steroid Hormones
Receptors, Progesterone
Cells, Cultured
Progesterone
DOI:
10.1159/000110448
Publication Date:
2007-10-26T08:01:08Z
AUTHORS (6)
ABSTRACT
Recent investigations suggest that sex hormones play an important role in the brown adipose tissue (BAT) thermogenic program by acting on several steps of the lipolytic signal cascade and on the UCP1 transcription control. However, the number of studies focusing on steroid receptor status in brown adipose tissue is negligible. In the present study, we analyze steroid receptor mRNA levels in brown adipose tissue in male and female rats and in pregnant and lactating females, all of them models with a different hormonal background. The direct effect of sex hormones on the expression of their receptors was studied in vitro in primary culture of brown adipocytes. Oestrogen receptor (ERalpha) and androgen receptor (AR) densities were higher in male than in female BAT. PR A+B mRNA expression was downregulated in lactation, suggesting a role of progesterone signalling in thermogenesis impairment at this stage. In vitro studies showed that progesterone decreased PR A+B mRNA and that testosterone downregulated ERalpha mRNA. The results highlighted in this study demonstrate the presence of steroid receptor mRNA in BAT and in brown cell cultured adipocytes, supporting the idea that changes in steroid receptor expression would be important for the understanding of sex hormone effects on BAT physiology.
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