title: Growth stimulation of sparse, serum deprived and of confluent, contact inhibited mammalian fibroblasts by a preparation of 3':5'-cyclic AMP phosphodiesterase.
abstract: Resting mammalian fibroblasts, either sparse and maintained in a serum-free medium, or confluent and contact inhibited, are stimulated to divide by treatment with a preparation of 3':5'-cyclic AMP phosphodiesterase. This enzyme preparation contained a low level of trypsin-like and alpha-chymotrypsin-like activity, but its effect on cell growth could not be mimicked by pure, crystallized trypsin and alpha-chymotrypsin at concentration equivalent to their contamination in the above preparation. Preincubation of the 3':5'-cyclic AMP phosphodiesterase preparation with the protease inhibitor, phenyl methane sulfonyl fulride, did not affect, either, its stimulation of DNA synthesis in fibroblasts, or its enzymatic hydrolysis of cyclic AMP.
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000494:pharmacology*; D000818:Animals; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002642:Chick Embryo; D003260:Contact Inhibition / Q000187:drug effects; D046508:Culture Techniques; D004247:DNA / Q000096:biosynthesis; D005347:Fibroblasts / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D051379:Mice; D010664:Phenylmethylsulfonyl Fluoride / Q000494:pharmacology; D010727:Phosphoric Diester Hydrolases / Q000494:pharmacology*
chemical_list: D010664:Phenylmethylsulfonyl Fluoride; D004247:DNA; D010727:Phosphoric Diester Hydrolases; D015105:3',5'-Cyclic-AMP Phosphodiesterases