A Second Protein Marker of Caveolae: Caveolin-2

doi:10.1016/S1001-9294(10)60034-X

Abstract

Abstract: Caveolin-2, a protein about 20 kD, is a major component of the inner surface of caveolae, small invaginations of the plasma membrane. Similar with caveolin-1 and caveolin-3, it serves as a protein marker of caveolae. Caveolin-1 and -2 are located next to each other at 7q31.1 on human chromosome, the proteins encoded are co-localized and form a stable hetero-oligomeric complex, distributing similarly in tissue and cultured cells. Caveolin-3 is located on different chromosomes but confirmed to interact with caveolin-2. Caveolin-2 is similar to caveolin-1 in many respects but differs from the latter in functional domains, especially in G-protein binding domain and caveolin scaffolding domain. The mRNAs of both caveolin-1 and caveolin-2 are most abundantly expressed in white adipose tissue and are induced during differentiation of 3T3-L1 cells to adipocytes. Caveolin-2-deficinet mice demonstrate clear pulmonary defects, with little or no change in caveolin-1 expression and caveolae formation, suggesting that caveolin-2 plays a selective role in lung functions. Caveolin-2 is also involved in lipid metabolism and human cancers.

Key words: caveolin-2, lung, lipid metabolism, cancer

Funding:

Supported by National Basic Research Program of China (973 Program) (2004CB518602, 2006CB503909) and National High Technology Research and Development Program of China (863 Program) (2009AA02Z192)

Liu-luan Zhu, Ying Cui, Yong-sheng Chang and Fu-de Fang. A Second Protein Marker of Caveolae: Caveolin-2[J].Chinese Medical Sciences Journal, 2010, 25(2): 119-124.

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