Evidence for a Ras-dependent extracellular signal-regulated protein kinase (ERK) cascade

David J. Robbins, Mangeng Cheng, Erzhen Zhen, Colleen A. Vanderbilt, Larry A. Feig, Melanie H. Cobb

Research output: Contribution to journalArticle

145 Scopus citations

Abstract

The small GTP-binding protein Ras appears to be required for transformation and differentiation induced by tyrosine kinases. The Ras requirement may be limited to a few tyrosine kinase-regulated signaling pathways or may be universal for all tyrosine kinase actions. Because both Ras and the microtubule-associated protein 2 kinases ERK1 and ERK2 have been implicated in events that lead to neurite outgrowth, we explored the possibility that Ras and ERKs may lie on the same signaling pathway. Utilizing PC-12 rat adrenal pheochromocytoma cell lines that contain a dominant inhibitory Ras mutant (S17N-RasH), we found that Ras was required for stimulation of the ERK cascade by nerve growth factor but apparently not by the heterotrimeric G protein activator AlF4-. Within this cascade, Ras appears to be upstream of an ERK activator, raising the intriguing possibility that Ras may directly regulate a serine/threonine protein kinase.

Original languageEnglish (US)
Pages (from-to)6924-6928
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume89
Issue number15
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • General

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