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Science 5 September 1986:
Vol. 233. no. 4768, pp. 1061 - 1068
DOI: 10.1126/science.3090687

Articles

Science, Vol 233, Issue 4768, 1061-1068
Copyright © 1986 by American Association for the Advancement of Science


articles

Induction of membrane ruffling and fluid-phase pinocytosis in quiescent fibroblasts by ras proteins

D Bar-Sagi and Feramisco JR

Expression of the ras oncogene is thought to be one of the contributing events in the initiation of certain types of human cancer. To determine the cellular activities that are directly triggered by ras proteins, the early consequences of microinjection of the human H-ras proteins into quiescent rat embryo fibroblasts were investigated. Within 30 minutes to 1 hour after injection, cells show a marked increase in surface ruffles and fluid-phase pinocytosis. The rapid enhancement of membrane ruffling and pinocytosis is induced by both the proto-oncogenic and the oncogenic forms of the H-ras protein. The effects produced by the oncogenic protein persist for more than 15 hours after injection, whereas the effects of the proto-oncogenic protein are short-lived, being restricted to a 3-hour interval after injection. The stimulatory effect of the ras oncogene protein on ruffling and pinocytosis is dependent on the amount of injected protein and is accompanied by an apparent stimulation of phospholipase A2 activity. These rapid changes in cell membrane activities induced by ras proteins may represent primary events in the mechanism of action of ras proteins.


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Uncoupling of Membrane Ruffling and Pinocytosis during Ras Signal Transduction.
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Galpha 12 Stimulates c-Jun NH2-terminal Kinase through the Small G Proteins Ras and Rac.
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J. Cell Sci. 109, 2005-2012
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Ceramide As a Modulator of Endocytosis.
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Science 250, 1743-1745
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Genes & Dev. 2, 567-577
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Rigorous feedback control of cAMP levels in Saccharomyces cerevisiae..
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Genes & Dev. 1, 931-937
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Ras p21 as a potential mediator of insulin action in Xenopus oocytes.
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Sprouty Proteins Are Targeted to Membrane Ruffles upon Growth Factor Receptor Tyrosine Kinase Activation. IDENTIFICATION OF A NOVEL TRANSLOCATION DOMAIN.
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Differential Activation of the Rac Pathway by Ha-Ras and K-Ras.
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J. Biol. Chem. 276, 15609-15615
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Mechanisms through which Sos-1 coordinates the activation of Ras and Rac.
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