Actions of IGF binding proteins and related proteins in adipose tissue

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• 作者：Robert C. Baxter ; Stephen M. Twigg
• 刊名：Trends in Endocrinology and Metabolism
• 出版年：2009
• 出版时间：December 2009
• 年：2009
• 卷：20
• 期：10
• 页码：499-505
• 全文大小：256 K

文摘

The insulin-like growth factors (IGFs), their binding proteins (IGFBPs) and structurally related proteins have been identified in adipose tissue but their roles in adipose tissue are poorly understood. IGF-I and IGFBP-3 expression increase during human preadipocyte differentiation. However, whereas IGF-I stimulates this process, IGFBP-3 is inhibitory both to preadipocyte differentiation and to differentiated adipocyte function. The direct interaction of IGFBP-3 with peroxisome proliferator-activated receptor-γ is believed to contribute to its inhibitory effect on differentiation. Connective tissue growth factor (CTGF/CCN2) shares weak structural homology and functional similarities with IGFBP-3, including inhibition of preadipocyte differentiation. This review examines the current knowledge of IGFBP regulation and actions in adipocytes and proposes a common regulatory pathway involving IGFBP-3 and CTGF/CCN2.