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Lookup NU author(s): Dr Francesca Di Sole
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It has been shown that when CFTR and NHE3 are co-expressed on the apical membrane of the A6-NHE3 cell monolayers, the two transporters interact via a shared regulatory complex composed of NHERF2, ezrin, and PKA. We observe here that co-expression of NHE3 reduced both PKA-dependent apical CFTR expression and its activation once in place by approximately 50%. To analyze the role of NHERF2 in this process, we transfected NHE3 expressing and non-expressing A6 monolayers with NHERF2 cDNA in which its binding domains had been deleted. When only CFTR is expressed on the apical membrane, deletion of any of the NHERF2 binding domains inhibited both PKA-dependent apical CFTR expression and its activation, while when NHE3 was co-expressed with CFTR PDZ2 deletion was without effect on CFTR sorting and activity. This suggests that when the PDZ2 domain is "sequestered" by interacting with NHE3 it can no longer participate in CFTR functional expression. (c) 2006 Elsevier Inc. All rights reserved.
Author(s): Favia M, Fanelli T, Bagorda A, Di Sole F, Reshkin SJ, Suh PG, Guerra L, Casavola V
Publication type: Article
Publication status: Published
Journal: Biochemical and Biophysical Research Communications
Year: 2006
Volume: 347
Issue: 2
Pages: 452-459
ISSN (print): 0006-291X
ISSN (electronic): 1090-2104
Publisher: Academic Press
URL: http://dx.doi.org/10.1016/j.bbrc.2006.06.112
DOI: 10.1016/j.bbrc.2006.06.112
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