Requirement for Ras Guanine Nucleotide Releasing Protein 3 in Coupling Phospholipase C-γ2 to Ras in B Cell Receptor Signaling

Masatsugu Oh-Hora, Sachiko Johmura, Ari Hashimoto, Masaki Hikida, Tomohiro Kurosaki

    Research output: Contribution to journalArticlepeer-review

    94 Citations (Scopus)

    Abstract

    Two important Ras guanine nucleotide exchange factors, Son of sevenless (Sos) and Ras guanine nucleotide releasing protein have been implicated in controlling Ras activation when cell surface receptors are stimulated. To address the specificity or redundancy of these exchange factors, we have generated Sos1/Sos2 double- or RasGRP3-deficient B cell lines and determined their ability to mediate Ras activation upon B cell receptor (BCR) stimulation. The BCR requires RasGRP3; in contrast, epidermal growth factor receptor is dependent on Sos1 and Sos2. Furthermore, we show that BCR-induced recruitment of RasGRP3 to the membrane and the subsequent Ras activation are significantly attenuated in phospholipase C-γ2-deficient B cells. This defective Ras activation is suppressed by the expression of RasGRP3 as a membrane-attached form, suggesting that phospholipase C-γ2 regulates RasGRP3 localization and thereby Ras activation.

    Original languageEnglish
    Pages (from-to)1841-1851
    Number of pages11
    JournalJournal of Experimental Medicine
    Volume198
    Issue number12
    DOIs
    Publication statusPublished - Dec 15 2003

    All Science Journal Classification (ASJC) codes

    • Immunology and Allergy
    • Immunology

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