title: Calcium ionophore A23187 as a regulator of gene expression in mammalian cells.
abstract: The calcium ionophore A23187 can reversibly induce the expression of two glucose-regulated genes, p3C5 and p4A3. This induction requires a continuous presence of the ionophore for over 2 h. Although extracellular Ca2+ is important for the optimal effect of A23187, it is not necessary for the induction, since a similar response with a lower magnitude can be triggered in cells cultured in low Ca2+ medium buffered with EGTA. Both the basal and induced levels of p3C5 and p4A3 transcripts can be modulated by the calmodulin antagonist W-7, indicating the involvement of Ca2+/calmodulin-associated pathways. In addition, the sensitivity of the A23187 induction to cycloheximide suggests that the induction process is dependent on de novo protein synthesis.
mesh_terms: D000818:Animals; D000001:Calcimycin / Q000494:pharmacology*; D002118:Calcium / Q000494:pharmacology; D002460:Cell Line; D006224:Cricetinae; D005796:Genes / Q000187:drug effects*; D005809:Genes, Regulator / Q000187:drug effects*; D018840:HSP70 Heat-Shock Proteins; D008565:Membrane Proteins / Q000096:biosynthesis / Q000235:genetics*; D009693:Nucleic Acid Hybridization; D010957:Plasmids; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D018840:HSP70 Heat-Shock Proteins; D008565:Membrane Proteins; C018551:glucose-regulated proteins; D000001:Calcimycin; D002118:Calcium