文章基本信息

标题：Expression of beta3-adrenoceptors with low lipolytic action in human subcutaneous white adipocytes.
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作者：G Tavernier ; P Barbe ; J Galitzky 等
期刊名称：JLR Papers In Press
印刷版ISSN：0022-2275
电子版ISSN：1539-7262
出版年度：1996
卷号：37
期号：1
页码：87-97
语种：English
出版社：American Society for Biochemistry and Molecular Biology
摘要：Beta3-Adrenoceptors are involved in the control of catecholamine-induced lipolysis in rodent adipose tissues. The expression and function of human beta3-adrenoceptors were investigated in subcutaneous white adipocytes of young healthy women. In these cells, beta3-adrenoceptor mRNAs represent 20% of total amount of beta-adrenoceptor transcripts and less than half of beta1-adrenoceptor transcripts. Among beta3-agonists known to stimulate beta3-adrenoceptor-mediated lipolysis in rodent fat cells, only CGP12177 was able to mediate such activity in human fat cells. In in vitro lipolysis experiments and in situ microdialysis studies, CGP12177 had a 4- to 5-times lower lipolytic efficacy than isoprenaline, a nonselective beta-adrenoceptor agonist. CGP12177-induced lipolysis was antagonized in vitro by bupranolol, a beta-adrenergic antagonist potent on rodent beta3-adrenoceptors but not by nadolol, a beta1- and beta2-adrenoceptor antagonist. The in vitro blockade of isoprenaline-stimulated lipolysis by nadolol showed that the agonist acted solely via beta1- and beta2-adrenoceptors. Isoprenaline and CGP12177 were able to increase the nutritive blood flow suggesting an interaction of these molecules with receptors present in adipose tissue vessels. In conclusion, beta3-adrenoceptors are expressed in human subcutaneous white adipocytes but do not significantly contribute to isoprenaline-induced lipolysis.