Some adrenomimetic drugs affecting lipolysis in human adipose tissue in vitro.
In human adipose tissue in vitro, dose-response curves were followed for different adrenomimetics releasing free fatty acids and glycerol into an albumin-containing medium. Phenylephrine, salbutamol and t-butyl-norsynephrine produced lipolytic actions whose maximum did not exceed 20% of the maximal isoproterenol lipolysis. Phentolamine (1 x 10(-5) M) did not potentiate the effect of any of these drugs. When using salbutamol or t-butyl-norsynephrine for antagonizing isoproterenol actions, typical antagonism was found. The parallel shift of the isoproterenol curves showed pA2 values 5.8 for salbutamol and 5.7 for t-butyl-norsynephrine. Comparison of human and rat adipose tissue reactivity shows identical affinities of the drugs studied in both tissues, but related to isoproterenol, diminished intrinsic activities of salbutamol and t-butyl-norsynephrine in human adipose tissue.
D000273:Adipose Tissue / Q000187:drug effects / Q000378:metabolism*; D000293:Adolescent; D000420:Albuterol / Q000494:pharmacology; D002648:Child; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D050356:Lipid Metabolism; D008297:Male; D009655:Octopamine / Q000494:pharmacology; D010646:Phentolamine / Q000494:pharmacology; D010656:Phenylephrine / Q000494:pharmacology; D013566:Sympathomimetics / Q000494:pharmacology*
D013566:Sympathomimetics; D009655:Octopamine; D010656:Phenylephrine; D000420:Albuterol; D010646:Phentolamine