CD46 and systemic lupus erythematosus: Importantly, inhibition of MMP‐9 activity also restored the impaired CD46‐mediated IL‐10 switching and contraction of Th1 cells observed in SLE by increasing IL‐10 production significantly and tipping the IFN‐γ to IL‐10 level ratio back towards IL‐10 (Fig. 5E).