Abstract:
:Caveolae are vesicular organelles (50-100-nm in diameter) that are particularly abundant in cells of the cardiovascular system, including endothelial cells, smooth muscle cells, macrophages, cardiac myocytes and fibroblasts. In these cell types, caveolae function both in protein trafficking and signal transduction, as well as in cholesterol homeostasis. Caveolins are the structural proteins that are both necessary and sufficient for the formation of caveolae membrane domains. Caveolins 1 and 2 are co-expressed in most cell types, while the expression of caveolin-3 is muscle-specific. Thus, endothelial cells and fibroblasts are rich in caveolins 1 and 2, while cardiac myocytes and skeletal muscle fibers express caveolin-3. In contrast, smooth muscle cells express all three caveolins (Cav-1, -2, and -3). Mechanistically, caveolins interact with a variety of downstream signaling molecules, including Src-family tyrosine kinases, p42/44 mitogen activated protein (MAP) kinase, and endothelial nitric oxide synthase (eNOS), and hold these signal transducers in the inactive conformation until activation by an appropriate stimulus. In many ways, caveolins serve both to compartmentalize and regulate signaling. Recent studies using caveolin-deficient mouse models dramatically show that caveolae and caveolins play a prominent role in various human patho-biological conditions, especially those related to the cardiovascular system. These disease phenotypes include: atherosclerosis, cardiac hypertrophy, cardiomyopathy, pulmonary hypertension, and neointimal hyperplasia (smooth muscle cell proliferation). In addition, caveolins play a significant role in other disease phenotypes, such as cancer, diabetes, bladder dysfunction, and muscular dystrophy, as we discuss in this review. Thus, caveolin-deficient mice will serve as important new animal models to dissect the intricate role of caveolae and caveolins in the pathogenesis of human diseases.
journal_name
Ann Medjournal_title
Annals of medicineauthors
Williams TM,Lisanti MPdoi
10.1080/07853890410018899subject
Has Abstractpub_date
2004-01-01 00:00:00pages
584-95issue
8eissn
0785-3890issn
1365-2060journal_volume
36pub_type
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更新日期:2005-01-01 00:00:00
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journal_title:Annals of medicine
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更新日期:1990-04-01 00:00:00
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