title: Effects of cyclic nucleotides on lipid biosynthesis in mouse mammary gland explants.
abstract: The effects of dibutyryl cAMP, 1-methyl-3-isobutyl xanthine (MIX), cGMP, dibutyryl cGMP, and 8-bromo cGMP on the rate of lipid synthesis in mouse mammary gland explants were studied. Dibutyryl cAMP at 10(-4) M selectively inhibited the effect of prolactin on the rate of [14C]acetate incorporation into lipids. At 10(-3) M, dB-cAMP inhibited the effects of insulin, insulin plus cortisol, and prolactin. The phosphodiesterase inhibitor, MIX, inhibited both basal and prolactin-stimulated incorporation rates in a concentration-dependent fashion. These data suggest an inhibitory role for cAMP in the regulation of lipogenesis in the mammary gland. Cyclic GMP, db-cGMP, and 8-bromo cGMP were all without effect on either basal or prolactin-stimulated incorporation rates. Therefore, it appears that cGMP, by itself, is not involved in the regulation of lipogenesis in the mammary gland.
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D000085:Acetates / Q000378:metabolism; D000818:Animals; D003994:Bucladesine / Q000494:pharmacology*; D006152:Cyclic GMP / Q000031:analogs & derivatives / Q000494:pharmacology*; D003995:Dibutyryl Cyclic GMP / Q000494:pharmacology; D005260:Female; D008055:Lipids / Q000096:biosynthesis*; D008321:Mammary Glands, Animal / Q000378:metabolism*; D051379:Mice; D011247:Pregnancy; D011388:Prolactin / Q000494:pharmacology
chemical_list: D000085:Acetates; D008055:Lipids; C016276:8-bromocyclic GMP; D003995:Dibutyryl Cyclic GMP; D003994:Bucladesine; D011388:Prolactin; D006152:Cyclic GMP; D015056:1-Methyl-3-isobutylxanthine