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- W3971567 abstract "Stimulation of the receptor tyrosine kinase KIT by Stem Cell Factor (SCF) triggers activation of RAS and its downstream effectors. Proper KIT activation is essential for the maturation, proliferation and survival of mast cells. In addition, SCF activation of KIT is critical for recruiting mast cells to sites of infection or injury, where they release a mix of pro-inflammatory substances. RIN3, a RAS effector and RAB5-directed guanine nucleotide exchange factor (GEF), is highly expressed and enriched in human mast cells. SCF treatment of mast cells increased the amount of GTP-bound RAB5, and the degree of RAB5 activation correlated with the expression level of RIN3. SCF treatment also caused the dissociation of a pre-formed complex of RIN3 with BIN2, a membrane bending protein. Silencing of RIN3 increased the rate of SCF-induced KIT internalization, while persistent RIN3 over-expression led to KIT downregulation. These observations strongly support a role for RIN3 in coordinating the early steps in KIT endocytosis. Importantly, RIN3 also functions as an inhibitor of mast cell migration toward SCF. Finally, we demonstrate that elevated RIN3 levels sensitize mastocytosis cells to treatment with a KIT tyrosine kinase inhibitor, suggesting the value of a two-pronged inhibitor approach for this difficult to treat malignancy. These findings directly connect KIT activation with a mast cell-specific RAS effector that regulates the cellular response to SCF and provide new insight for the development of more effective mastocytosis treatments." @default.
- W3971567 created "2016-06-24" @default.
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- W3971567 date "2012-01-01" @default.
- W3971567 modified "2023-09-24" @default.
- W3971567 title "RIN3 negatively regulates SCF-mediated responses of mast cells" @default.
- W3971567 hasPublicationYear "2012" @default.
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