Abstract:
:Rous sarcoma virus (RSV)-infected chicken embryo cells were used to study the effect of viral transformation on the hormone-stimulated synthesis of cyclic AMP. Transformation by RSV greatly increased the cells' ability to synthesize and accumulate cyclic AMP in response to the beta-adrenergic agonist isoproterenol as compared to untransformed cells. This enhancement was observed in both intact cells and in membranes prepared from these cells. The inclusion of guanosine 5'-0-(3-thiotriphosphate), a nonhydrolyzable analogue of GTP, in assays of adenylate cyclase activity did not abolish the quantitative differences between the transformed and normal cell membranes. Infection of cells by Rous-associated virus, which lacks the oncogene src, did not induce this hyperresponsiveness thus indicating the probable involvement of the src gene product in this phenomenon. The duration of the isoproterenol-induced cyclic AMP elevation was longer in the transformed than in the untransformed cells; transformed cells, unlike untransformed cells, required at least 120 min before full desensitization became established. Membranes prepared from transformed cells specifically bound more than 5 times the quantity of the beta-adrenergic radiolabeled antagonist (-)3H-dihydroalprenolol and 125I-iodocyanopindolol compared to the untransformed cell membranes. Thus, it appears that major differences between the transformed and normal phenotypes reside in the concentration of membrane beta-adrenergic receptors and the inability of RSV-transformed cells to self-limit their response to specific external stimuli.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Howard RF,Friis RR,Sheppard JR,Glossmann Hdoi
10.1002/jcp.1041110311subject
Has Abstractpub_date
1982-06-01 00:00:00pages
295-302issue
3eissn
0021-9541issn
1097-4652journal_volume
111pub_type
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