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- W2170826786 abstract "Susceptibility to severe lupus in MRL-Fas(lpr) mice requires not only the lpr mutation but also other predisposing genes. Using (MRL-Fas(lpr) x B6-Fas(lpr))F2 (where B6 represents C57BL/6) intercrosses that utilize the highly susceptible MRL and poorly susceptible B6 backgrounds, we previously mapped CFA-enhanced systemic lupus-like autoimmunity to four loci, named Lmb1-4, on chromosomes 4, 5, 7, and 10. In the current study, we generated and analyzed reciprocal interval congenic mice for susceptibility to CFA-enhanced autoimmunity at all four Lmb loci. Although all loci had at least a slight effect on lymphoproliferation, only Lmb3 demonstrated a major effect on lymphoproliferation and anti-chromatin Ab levels. Further characterization of Lmb3, primarily by comparing MRL-Fas(lpr) with MRL.B6-Lmb3 Fas(lpr) congenic mice, revealed that it also played a significant role in spontaneous lupus, modifying lymphoproliferation, IgG and autoantibody levels, kidney disease, and survival. The less susceptible B6 Lmb3 locus was associated with a marked reduction in numbers of CD4(+) and double-negative (CD4(-)CD8(-)) T cells, particularly in lymph nodes, as well as reduced T cell proliferation and enhanced T cell apoptosis, both in vivo and in vitro. IFN-gamma-producing CD4(+) T cells were also reduced in MRL.B6-Lmb3 Fas(lpr) mice. Further mapping using subinterval congenic mice placed Lmb3 in the telomeric portion of chromosome 7. Thus, Lmb3, primarily through its effects on CD4(+) and double-negative T cells, appears to be a highly penetrant lupus-modifying locus. Identification of the underlying genetic alteration responsible for this quantitative trait locus should provide new insights into lupus-modifying genes." @default.
- W2170826786 created "2016-06-24" @default.
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- W2170826786 date "2007-06-15" @default.
- W2170826786 modified "2023-09-28" @default.
- W2170826786 title "Characterization of Reciprocal <i>Lmb1–4</i> Interval MRL-<i>Fas</i> <i>lpr</i> and C57BL/6-<i>Fas</i> <i>lpr</i> Congenic Mice Reveals Significant Effects from <i>Lmb3</i>" @default.
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- W2170826786 doi "https://doi.org/10.4049/jimmunol.178.12.8195" @default.
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