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lüll Role of caveolin and caveolae in insulin signaling and diabetes Cohen AW; Combs TP; Scherer PE; Lisanti MPAm J Physiol Endocrinol Metab 2003[Dec]; 285 (6): E1151-60Caveolae are specialized membrane microdomains present within the plasma membrane of the vast majority of cell types. They have a unique composition in that they are highly enriched in cholesterol, sphingolipids, and their coat proteins the caveolins (-1, -2, and -3). In recent years it has been recognized that caveolae act as signaling platforms, serving as a concentrating point for numerous signaling molecules, as well as regulating flux through many distinct signaling cascades. Although caveolae are found in a variety of cell types, they are most abundant in adipose tissue. This fact has led to the intense study of the function of these organelles in adipocytes. It has now become apparent that effective insulin signaling in the adipocyte may be strictly dependent on localization of at least two insulin-responsive elements to caveolae (insulin receptor and GLUT4), as well as on a direct functional interaction between caveolin-1 and the insulin receptor. We present a critical discussion of these recent findings.|*Muscle Proteins[MESH]|*Signal Transduction[MESH]|Adipose Tissue/*metabolism[MESH]|Animals[MESH]|Caveolae/*metabolism[MESH]|Caveolin 1[MESH]|Caveolins/*metabolism[MESH]|Diabetes Mellitus/*metabolism[MESH]|Glucose Transporter Type 4[MESH]|Humans[MESH]|Insulin Resistance[MESH]|Insulin/*metabolism[MESH]|Monosaccharide Transport Proteins/metabolism[MESH]|Receptor, Insulin/*metabolism[MESH] |