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Adipocyte enhancer-binding protein 1 (AEBP1) up-regulates MAP-kinase activity leading to enhanced proliferation and reduced differentiation of the adipocyte. AEBP1 also up-regulates NF-kappa-B activity in macrophages via phosphorylation and subsequent degradation of I-kappa-B-alpha. This leads to enhanced macrophage inflammatory responsiveness. It can also act as a transcriptional repressor.