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Journals Journal of Leukocyte Biology August 2009

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Functional implication of BAFF synthesis and release in gangliosides-stimulated microglia

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BAFF is a recently identified member of the TNF ligand superfamily that plays a critical role in B cell differentiation, survival, and regulation of Ig production. In the present study, we examined whether BAFF is expressed in microglia, and the expression and release of BAFF are regulated by gangliosides. The results showed that BAFF was expressed and released in rat primary microglia as well as in BV-2 cells. Furthermore, its expression and release were increased by gangliosides stimulation and regulated by JAK-STAT, especially the STAT1- and STAT3-dependent signaling pathways. It was of particular interest to observe that SP600125 and SB203580, specific inhibitors of JNK and p38, did not inhibit BAFF synthesis but inhibited the release of sBAFF in gangliosides-treated cells by regulating furin expression, suggesting that the JNK and p38 signaling pathways regulate the release but not the synthesis of BAFF. Moreover, BV-2 cells expressed BAFF-R on their cell surface, and rat primary microglia expressed BAFF-R and TACI on their cell surface. rBAFF increased the release of cytokines, especially IL-6, TNF- , and IL-10, in rat primary microglia as well as in BV-2 cells. These findings imply that BAFF secreted by microglia may play important roles in CNS inflammation by regulating microglia as well as infiltrated B cells. Key Words: BAFF-R • TACI • CNS

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Article Details
Kim, Kwang Soo; Park, Ji-Young; Jou, Ilo; Park, Sang Myun
Journal of Leukocyte Biology , Volume 86 (2): 349
Fed of American Socs for Experimental Biology – Aug 1, 2009
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