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Ly49D receptor expressed on immature B cells regulates their IFN-gamma secretion, actin polymerization, and homing.

J. Immunol.2003 Nov 01;171(9):4630-8. doi:10.4049/jimmunol.171.9.4630
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摘要


Low levels of IFN-gamma secreted by immature B cells prevent their own migration and homing to the lymph nodes and premature encounter with Ag. In this study we followed the mechanism regulating IFN-gamma secretion by immature B cells. We show that the MHC class I receptor, Ly49D, is expressed on immature B cells and is down-regulated during maturation. Activation of this receptor leads to increase in IFN-gamma transcription and translation and results in the altered ability of B cells to polymerize actin in response to chemokine stimulation. Moreover, we show that H2-D blockage inhibits the ability of immature B cells to transcribe the IFN-gamma gene and results in rescue of cytoskeletal rearrangement. Thus, Ly49D that is expressed on immature B cells recognizes MHC class I on the peripheral tissues, inducing the secretion of low levels of IFN-gamma and thereby down-regulating immature B cell homing to the lymph nodes or to sites of inflammation.

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