Abstract:
:The protein kinase C stimulator TPA (12-O-tetradecanoyl phorbol-13-acetate) enhanced the responsiveness of adenylate cyclase to IPR (isoproterenol) and PGE1 (prostaglandin E1) in quiescent tsKSV-NRK cells at the nonpermissive 41 degrees C. Reactivating the thermolabile mitogenic/oncogenic K-ras protein in tsKSV-NRK cells by dropping the temperature to 36 degrees C also enhanced the responsiveness of adenylate cyclase to IPR and PGE1. The enhancement was transient and peaked at 6 hours after the temperature shift. This enhanced responsiveness was specifically due to the reactivated viral K-ras protein rather than the temperature shift because the same temperature shift did not affect adenylate cyclase responsiveness in uninfected NRK cells, nor was it a result of the mitogenic stimulus since reacting the mitogenic pp60v-src protein in tsASV-NRK cells did not affect adenylate cyclase responsiveness. The increased responsiveness of adenylate cyclase at 6 hours after the temperature shift was not a result of elevated membrane-associated PKC activity. However, the reactivated viral K-ras protein strongly increased the stimulability of membrane-associated PKC by TPA and it further increased TPA's ability to enhance the responsiveness of adenylate cyclase to IPR and PGE1. Thus, a viral K-ras protein and membrane-associated protein kinase C can cooperate to increase the responsiveness of adenylate cyclase to agonists.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Franks DJ,Durkin JP,Whitfield JFdoi
10.1002/jcp.1041400302subject
Has Abstractpub_date
1989-09-01 00:00:00pages
409-7issue
3eissn
0021-9541issn
1097-4652journal_volume
140pub_type
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