Effect of oleoyl-estrone treatment on the expression of beta1- beta2- and beta3-adrenoreceptors in rat adipose tissues.
Adult female rats received a constant i.v. infusion of oleoyl-estrone (3.5 pmol/kg day) in a lipidic suspension for 14 days. On days 0 (no treatment), 3, 6, 10 and 14, as well as on day 14 for controls (receiving only the lipid); the rats were killed and the expression of the beta1-, beta2- and beta3-adrenoceptor genes, in brown adipose tissue and in subcutaneous and periovaric white adipose tissue, were measured by RNA protection assay, and compared with that of cyclophyllin. The beta3-adrenoceptor was the most expressed in all adipose tissues, whereas beta2 was the less expressed in brown adipose tissue. Oleoyl-estrone significantly, but moderately, increased the expression of beta-adrenoceptors in the three adipose tissues: beta1 increased in subcutaneous, beta2 and beta3 in periovaric and beta3 in brown adipose tissue. Oleoyl-estrone also decreased beta3 expression in subcutaneous white adipose tissue. On day 10, adipocytes isolated from periovaric white adipose tissue of oleoyl-estrone-treated rats showed higher cAMP response to an isoproterenol challenge than the controls. The mechanism by which oleoyl-estrone elicits the wasting of fat reserves could be mediated by adrenergic pathways, at least in part.
Cabot
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C
Centre Especial de Recerca en Nutrició i Ciència dels Aliments, Facultat de Biologia, Universitat de Barcelona, Spain.
del Mar Grasa
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M
Fernández-López
J A
JA
Alemany
M
M
D000273:Adipose Tissue / Q000187:drug effects / Q000378:metabolism*; D002001:Adipose Tissue, Brown / Q000187:drug effects / Q000378:metabolism; D000818:Animals; D019440:Anti-Obesity Agents / Q000494:pharmacology*; D000242:Cyclic AMP / Q000096:biosynthesis; D004970:Estrone / Q000031:analogs & derivatives* / Q000494:pharmacology*; D005260:Female; D007545:Isoproterenol / Q000494:pharmacology; D007700:Kinetics; D009829:Oleic Acids / Q000494:pharmacology*; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D012333:RNA, Messenger / Q000096:biosynthesis; D051381:Rats; D011924:Rats, Zucker; D018342:Receptors, Adrenergic, beta-1 / Q000096:biosynthesis* / Q000235:genetics; D018343:Receptors, Adrenergic, beta-2 / Q000096:biosynthesis* / Q000235:genetics; D022702:Receptors, Adrenergic, beta-3 / Q000096:biosynthesis* / Q000235:genetics; D014158:Transcription, Genetic / Q000187:drug effects
D019440:Anti-Obesity Agents; D009829:Oleic Acids; D016376:Oligonucleotides, Antisense; D012333:RNA, Messenger; D018342:Receptors, Adrenergic, beta-1; D018343:Receptors, Adrenergic, beta-2; D022702:Receptors, Adrenergic, beta-3; D004970:Estrone; C108709:oleoyl-estrone; D000242:Cyclic AMP; D007545:Isoproterenol