MafB is a critical regulator of complement component C1q.

Nature communications (2017-11-24)
Mai Thi Nhu Tran, Michito Hamada, Hyojung Jeon, Risako Shiraishi, Keigo Asano, Motochika Hattori, Megumi Nakamura, Yuki Imamura, Yuki Tsunakawa, Risa Fujii, Toshiaki Usui, Kaushalya Kulathunga, Christina-Sylvia Andrea, Ryusuke Koshida, Risa Kamei, Yurina Matsunaga, Makoto Kobayashi, Hisashi Oishi, Takashi Kudo, Satoru Takahashi

The transcription factor MafB is expressed by monocytes and macrophages. Efferocytosis (apoptotic cell uptake) by macrophages is important for inhibiting the development of autoimmune diseases, and is greatly reduced in Mafb-deficient macrophages. Here, we show the expression of the first protein in the classical complement pathway C1q is important for mediating efferocytosis and is reduced in Mafb-deficient macrophages. The efferocytosis defect in Mafb-deficient macrophages can be rescued by adding serum from wild-type mice, but not by adding serum from C1q-deficient mice. By hemolysis assay we also show that activation of the classical complement pathway is decreased in Mafb-deficient mice. In addition, MafB overexpression induces C1q-dependent gene expression and signals that induce C1q genes are less effective in the absence of MafB. We also show that Mafb-deficiency can increase glomerular autoimmunity, including anti-nuclear antibody deposition. These results show that MafB is an important regulator of C1q.

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Monoclonal ANTI-FLAG® M2 antibody produced in mouse, clone M2, purified immunoglobulin (Purified IgG1 subclass), buffered aqueous solution (10 mM sodium phosphate, 150 mM NaCl, pH 7.4, containing 0.02% sodium azide)
Lys-Lys-Lys-Lys, ≥95% (TLC)
Phorbol 12-myristate 13-acetate, synthetic, ≥98.0% (TLC)
Eppendorf® Thermomixer Compact, with 1.5 mL block, AC/DC input 115 V AC
RPMI-1640 Medium, With L-glutamine and sodium bicarbonate, liquid, sterile-filtered, suitable for cell culture