Anti-ITGAX monoclonal antibody, clone CV26 [PE]

IgA nephropathy (IgAN) is one of the most common primary glomerulonephritis. Previously identified genome-wide association study (GWAS) loci explain only a fraction of disease risk. To identify novel susceptibility loci in Han Chinese, we conduct a four-stage GWAS comprising 8,313 cases and 19,680 controls. Here, we show novel associations at ST6GAL1 on 3q27.3 (rs7634389, odds ratio (OR) = 1.13, P = 7.27 x 10(-10)), ACCS on 11p11.2 (rs2074038, OR = 1.14, P = 3.93 x 10(-9)) and ODF1-KLF10 on 8q22.3 (rs2033562, OR = 1.13, P = 1.41 x 10(-9)), validate a recently reported association at ITGAX-ITGAM on 16p11.2 (rs7190997, OR = 1.22, P = 2.26 x 10(-19)), and identify three independent signals within the DEFA locus (rs2738058, P = 1.15 x 10(-19); rs12716641, P = 9.53 x 10(-9); s9314614, P = 4.25 x 10(-9), multivariate association). The risk variants on 3q27.3 and 11p11.2 show strong association with mRNA expression levels in blood cells while allele frequencies of the risk variants within ST6GAL1, ACCS and DEFA correlate with geographical variation in IgAN prevalence. Our findings expand our understanding on IgAN genetic susceptibility and provide novel biological insights into molecular mechanisms underlying IgAN.

Sepsis is a life-threatening syndrome caused by abnormal host immune responses against bacterial infection. Although innate immune cells are known to be important in the pathogenesis of sepsis, how their activation is regulated during sepsis remains incompletely understood. Here, we examined the role of the inhibitory immunoreceptor CD300a, which is expressed on various types of myeloid cells, in the pathogenesis of sepsis induced by cecal ligation and puncture (CLP). To this end, we used mice in which CD300a was specifically deleted on mast cells (MCs; Cd300a(fl/fl)Mcpt5-Cre), dendritic cells (DCs; Cd300a(fl/fl)Itgax-Cre), or macrophages and neutrophils (Cd300a(fl/fl)Lyz2-Cre). We show that mice with CD300a-deleted MCs or DCs but not macrophages survived significantly longer than did control Cd300a(fl/fl) mice. In addition, whereas neutrophil recruitment into the peritoneal cavity was increased within 1 h after CLP in mice with CD300a-deleted MCs, peritoneal neutrophils did not increase in number until the 12 h time point in mice with CD300a-deficient DCs. These results indicate that CD300a on MCs and DCs regulates neutrophil recruitment into the peritoneal cavity after CLP.