Differential expression of adenosine A1 and A2 receptors in preadipocytes and adipocytes.
Multiple physiological functions have been described to be affected by adenosine in numerous cell types. A comparative study of the expression of adenosine receptors has been performed in preadipocytes and adipocytes from rat epididymal fat pad. The results show that, in agreement with its well known antilipolytic effect, adenosine induces a negative modulation of adenylate cyclase via the A1 receptor present in adipocytes. By contrast, the A2 receptor subtype, which is positively coupled to adenylate cyclase, is herein demonstrated to be only expressed in adipose precursor cells. This expression allows, in chemically defined medium, the adenosine analogue NECA, by means of its ability to elevate cAMP concentration, to potentiate differentiation. These findings emphasize the role that adenosine might play as a bimodal regulatory extracellular signal in adipose tissue development.
Centre de Biochimie (CNRS UMR 134), Faculté des Sciences, Université de Nice-Sophia Antipolis, France.
G
G
Vassaux
D
D
Gaillard
B
B
Mari
G
G
Ailhaud
R
R
Negrel
D000241:Adenosine / Q000031:analogs & derivatives / Q000494:pharmacology; D019830:Adenosine-5'-(N-ethylcarboxamide); D000273:Adipose Tissue / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*; D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D002454:Cell Differentiation; D002478:Cells, Cultured; D000242:Cyclic AMP / Q000378:metabolism; D004247:DNA; D015342:DNA Probes; D004822:Epididymis; D005993:Glycerolphosphate Dehydrogenase / Q000378:metabolism; D008297:Male; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009838:Oligodeoxyribonucleotides; D010660:Phenylisopropyladenosine / Q000494:pharmacology; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D011983:Receptors, Purinergic / Q000096:biosynthesis* / Q000302:isolation & purification / Q000378:metabolism
D015342:DNA Probes; D009838:Oligodeoxyribonucleotides; D012333:RNA, Messenger; D011983:Receptors, Purinergic; D010660:Phenylisopropyladenosine; D019830:Adenosine-5'-(N-ethylcarboxamide); D004247:DNA; D000242:Cyclic AMP; D005993:Glycerolphosphate Dehydrogenase; D000241:Adenosine