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

研究成果: ジャーナルへの寄稿学術誌査読

95 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)1841-1851
ページ数11
ジャーナルJournal of Experimental Medicine
198
12
DOI
出版ステータス出版済み - 12月 15 2003
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 免疫アレルギー学
  • 免疫学

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