Abstract
Recombinant adipogenesis inhibitory factor (AGIF) was purified to homogeneity from the conditioned medium of COS-1 cells transfected with human AGIF cDNA. The amino-terminal sequence analysis of the mature AGIF revealed that AGIF was produced as a precursor consisting of 199 amino acids and processed into a mature form of 178 amino acids by a cleavage between Ala(−1) and Pro(+1). The purified AGIF inhibited the process of adipogenesis in mouse 3T3-L1 preadipocytes, indicating that AGIF directly acts on the cells. AGIF acted as an adipogenic antagonist not only on the extramedullary cell line 3T3-L1 but also on the mouse bone marrow stroma-derived cell line H-I/A, suggesting that this cytokine may regulate adipogenesis in bone marrow.
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