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Deprecated: Implicit conversion from float 263.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Immunol 2016 ; 197 (10): 3792-805 Nephropedia Template TP
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Small molecule inhibition of Rab7 impairs B cell class-switching and plasma cell survival to dampen the autoantibody response in murine lupus #MMPMID27742832
Lam T; Kulp DV; Wang R; Lou Z; Taylor J; Rivera CE; Yan H; Zhang Q; Wang Z; Zan H; Ivanov DN; Zhong G; Casali P; Xu Z
J Immunol 2016[Nov]; 197 (10): 3792-805 PMID27742832show ga
IgG autoantibodies mediate pathology in systemic lupus patients and lupus-prone mice. Here we showed that the class-switched IgG autoantibody response in MRL/Faslpr/lpr and C57/Sle1Sle2Sle2 mice was blocked by the CID 1067700 compound, which specifically targeted Rab7, an endosome-localized small GTPase that was upregulated in activated human and mouse lupus B cells, leading to prevention of disease development and extension of life-span. These were associated with decreased IgG-expressing B cells and plasma cells, but unchanged numbers and functions of myeloid cells and T cells. The Rab7 inhibitor suppressed T cell-dependent and T cell-independent antibody responses, but did not affect T cell-mediated clearance of Chlamydia infection, consistent with a B cell-specific role of Rab7. Indeed, B cells and plasma cells were inherently sensitive to Rab7 gene knockout or Rab7 activity inhibition in class-switching and survival, respectively, while proliferation/survival of B cells and generation of plasma cells were not affected. Impairment of NF-?B activation upon Rab7 inhibition, together with the rescue of B cell class-switching and plasma cell survival by enforced NF-?B activation, indicated that Rab7 mediates these processes by promoting NF-?B activation, likely through signal transduction on intracellular membrane structures. Thus, a single Rab7-inhibiting small molecule can target two stages of B cell differentiation to dampen the pathogenic autoantibody response in lupus.