The results suggest that: (1) upregulation of mesangial FasL may contribute to the glomerular inflammation in proliferative lupus nephritis in vivo; (2) proinflammatory cytokines, in particular IL1beta, produced in nephritis can upregulate FasL via the transcription factor NFkappaB in HMC; and (3) MMP-7-mediated release of soluble FasL could control the mesangial inflammation.
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