| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2010: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Research Abstract |
The Ras/B-Raf/C-Raf/MEK/ERK pathway (ERK pathway) is critical for the control of many cellular processes including proliferation. Here we showed that siRNA-dependent knockdown of diacylglycerol kinase η (DGK η) impairs the ERK pathway activated by epidermal growth factor (EGF) in HeLa cells. The overexpression of DGK η could activate the ERK pathway in a DGK activity-independent manner, suggesting that DGK η serves as an adaptor protein. We revealed that DGK η activates C-Raf but not B-Raf. Moreover, knockdown of DGK η inhibited EGF-induced heterodimerization of C-Raf with B-Raf. DGK η physically interacted with B-Raf and C-Raf and regulated EGF-induced recruitment of B-Raf and C-Raf from the cytosol to membranes. These results support that DGK η acts as a novel critical regulatory component of the ERK signaling cascade.
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