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• W2019690523 abstract "The sodium-hydrogen exchanger regulatory factor, NHERF (also called EBP50), was isolated initially as a necessary cofactor in cAMP-associated inhibition of the renal brush border sodium-hydrogen exchanger (NHE3) (1). Shortly thereafter, a second member of this family was cloned and characterized (NHERF2, also called E3KARP and TKA1) (2). NHERF and NHERF2 contain two tandem protein-protein interactive PDZ domains. Following the demonstration that these proteins bind ezrin, a new model was developed for regulation of NHE3 signaling by cAMP (3, 4), in which NHERF (or NHERF2), ezrin, and protein kinase A form a multiprotein signal complex linking NHE3 to the actin cytoskeleton. The formation of this complex is proposed to facilitate the phosphorylation and downregulation of NHE3.Recent studies have confirmed the basic elements of the model (4). This form of signal transduction, not previously considered in control of epithelial transporters, has generated considerable interest (5), and recent experiments have documented an association between NHERF and NHERF2 with a number of other transporters (4). While the precise relation between NHERF and these transport proteins remains to be determined, there are already preliminary data to suggest that NHERF interacts with these proteins in ways not directly linked to its role as an adaptor protein.A remarkable offshoot of the isolation of NHERF has been the discovery of its involvement with a broad array of biologic systems. At least three of the effects of NHERF are distinct from its regulation of renal transporters and deserve special comment. First, Katzenellenbogen and coworkers reported that estrogen stimulates the expression of NHERF in estrogen receptor-positive but not receptor-negative breast cancer cell lines and that antiestrogens can block this effect (6). Concurrent with these studies, we had isolated a large fragment of the mouse NHERF promoter and, given the above results, were surprised to find that it contains no recognizable estrogen response element and that estrogen fails to stimulate NHERF reporter constructs transiently expressed in estrogen receptor-positive cell lines (7). The mechanism of estrogen stimulation of NHERF remains to be determined; nonetheless, it is suggested that NHERF is involved in the signal-transduction pathway of estrogen. Recently, Stemmer-Rachamimov et al. reported a correlation between expression of NHERF and of estrogen receptors in breast carcinoma specimens (8). Others have made similar observations. The array of proteins stimulated by estrogen is finite, and identification of a new estrogen-responsive protein with a possible link to breast cancer is likely to stimulate research into the possible role of NHERF in breast, endometrium, and other estrogen-stimulated tissues.The relation between NHERF and the cystic fibrosis transmembrane regulator (CFTR) has been another area of increasing interest. CFTR functions as a cAMP-regulated chloride channel, and mutations in CFTR are causal in cystic fibrosis. CFTR contains a C-terminal NHERF consensus sequence and the two proteins bind with high affinity, an interaction that may help explain CFTR’s ability to regulate other transport proteins, including the epithelial sodium channel, the renal outer medullary potassium channel, and NHE3. Recent experiments have postulated two, not necessarily exclusive, roles for NHERF in CFTR function. Guggino, Stanton, and coworkers have proposed that NHERF functions as a membrane retention signal for CFTR (9). Foskett and coworkers suggest that NHERF facilitates the dimerization of CFTR and, as a consequence, full expression of chloride channel activity (10). As is the case for the relation between NHERF and estrogen signaling, the associations between NHERF and CFTR and their relevance to the complex physiologic derangements seen in cystic fibrosis are still unfolding." @default.
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• W2019690523 date "2001-07-15" @default.
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• W2019690523 title "New functions for the NHERF family of proteins" @default.
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• W2019690523 doi "https://doi.org/10.1172/jci13518" @default.
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