Differential targeting of nNOS and AQP4 to dystrophin-deficient sarcolemma by membrane-directed α-dystrobrevin
Open Access
- 1 January 2008
- journal article
- Published by The Company of Biologists in Journal of Cell Science
- Vol. 121 (1), 48-54
- https://doi.org/10.1242/jcs.020701
Abstract
α-Dystrobrevin associates with and is a homologue of dystrophin, the protein linked to Duchenne and Becker muscular dystrophies. We used a transgenic approach to restore α-dystrobrevin to the sarcolemma in mice that lack dystrophin (mdx mice) to study two interrelated functions: (1) the ability of α-dystrobrevin to rescue components of the dystrophin complex in the absence of dystrophin and (2) the ability of sarcolemmal α-dystrobrevin to ameliorate the dystrophic phenotype. We generated transgenic mice expressing α-dystrobrevin-2a linked to a palmitoylation signal sequence and bred them onto the α-dystrobrevin-null and mdx backgrounds. Expression of palmitoylated α-dystrobrevin prevented the muscular dystrophy observed in the α-dystrobrevin-null mice, demonstrating that the altered form of α-dystrobrevin was functional. On the mdx background, the palmitoylated form of α-dystrobrevin was expressed on the sarcolemma but did not significantly ameliorate the muscular dystrophy phenotype. Palmitoylated dystrobrevin restored α-syntrophin and aquaporin-4 (AQP4) to the mdx sarcolemma but was unable to recruit β-dystroglycan or the sarcoglycans. Despite restoration of sarcolemmal α-syntrophin, neuronal nitric oxide synthase (nNOS) was not localized to the sarcolemma, suggesting that nNOS requires both dystrophin and α-syntrophin for correct localization. Thus, although nNOS and AQP4 both require interaction with the PDZ domain of α-syntrophin for sarcolemmal association, their localization is regulated differentially.Keywords
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