title: Induction of surface glycoprotein expression by cyclic AMP in Chinese hamster ovary cells.
abstract: Surface expression of a membrane glycoprotein of 135,000 molecular weight (P135) was inducible by adenosine 3',5' -cyclic monophosphate in Chinese hamster ovary cells, CHO-K1 clone. Cells were cultured in the presence or absence of cyclic AMP derivatives, chemicals influencing cytoplasmic cyclic AMP levels, or inhibitors of protein or RNA synthesis. Surface proteins wre radiolabeled by a lactoperoxidase-catalyzed iodination reaction and analyzed by two-dimensional polyacrylamide gel electrophoresis. Surface expression of P135 increased 3---5-fold inthe presence of N6,O2' -dibutyryl cyclic AMP or 8-parachlorophenylthio cyclic AMP. Induction was also observed after treatment with prostaglandins E1 and F2 alpha, but not with sodium butyrate. Phosphodiesterase inhibitor, Roche compound Ro20-1724, enhanced the effect of N6,O2' -dibutyryl cyclic AMP. Metabolic incorporation of [35S]methionine into P135 was increased by N6,O2' -dibutyryl cyclic AMP. The induction was sensitive to inhibitors of protein and RNA biosynthesis. These results are consistent with a proposal that cyclic AMP controls the synthesis of this protein. Metabolic incorporation of a radioactive precursor suggested that P135 was a glucos-amine-containing glycoprotein. P135 appeared to be strongly associated with cell membrane because it was resistant to extraction of plasma membrane by cole 0.1 N NaOH.
mesh_terms: D012368:4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinone / Q000494:pharmacology; D000818:Animals; D003994:Bucladesine / Q000494:pharmacology*; D002460:Cell Line; D006224:Cricetinae; D003412:Cricetulus; D000242:Cyclic AMP / Q000031:analogs & derivatives / Q000494:pharmacology / Q000502:physiology*; D003513:Cycloheximide / Q000494:pharmacology; D003609:Dactinomycin / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D005260:Female; D005786:Gene Expression Regulation; D008565:Membrane Proteins / Q000378:metabolism / Q000502:physiology*; D010053:Ovary; D011453:Prostaglandins / Q000494:pharmacology; D013873:Thionucleotides / Q000494:pharmacology; D013997:Time Factors
chemical_list: D008565:Membrane Proteins; D011453:Prostaglandins; D013873:Thionucleotides; D003609:Dactinomycin; D012368:4-(3-Butoxy-4-methoxybenzyl)-2-imidazolidinone; C015929:8-((4-chlorophenyl)thio)cyclic-3',5'-AMP; D003994:Bucladesine; D003513:Cycloheximide; D000242:Cyclic AMP