title: Killing of fibroblasts by dexamethasone or dibutyryl adenosine 3',5'-monophosphate is not a valid test for cystic fibrosis.
abstract: Assays based on the counting of total cells and of colony-forming cells were used to demonstrate that neither dexamethasone nor dibutyryl adenosine 3',5'-monophosphate (cyclic AMP) kills human fibroblasts under a variety of conditions. These results contradict those of previous studies showing that dexamethasone and dibutyryl cyclic AMP kill a higher percentage of fibroblasts from normal humans than from individuals with cystic fibrosis.
mesh_terms: D000293:Adolescent; D000328:Adult; D003994:Bucladesine / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D002648:Child; D002675:Child, Preschool; D003550:Cystic Fibrosis / Q000175:diagnosis*; D003907:Dexamethasone / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005260:Female; D005347:Fibroblasts / Q000187:drug effects*; D006801:Humans; D010042:Ouabain / Q000494:pharmacology; D012867:Skin / Q000166:cytology
chemical_list: D010042:Ouabain; D003994:Bucladesine; D003907:Dexamethasone