Alterations of dystrophin-associated glycoproteins in the heart lacking dystrophin or dystrophin and utrophin.
Alterations of dystrophin-associated glycoproteins in the heart lacking dystrophin or dystrophin and utrophin.
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DOI:
10.1007/s10974-013-9362-9
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发表时间:
2013-12
影响因子:
2.7
通讯作者:
Townsend, DeWayne
中科院分区:
文献类型:
--
作者:
Sharpe, Katharine M.;Premsukh, Monica D.;Townsend, DeWayne
Heart disease is a leading cause of death in patients with Duchenne muscular dystrophy (DMD). Patients with DMD lack the protein dystrophin, which is widely expressed in striated muscle. In skeletal muscle, the loss of dystrophin results in dramatically decreased expression of the dystrophin associated glycoprotein complex (DGC). Interestingly, in the heart the DGC is normally expressed without dystrophin; this has been attributed to presence of the dystrophin homologue utrophin. We demonstrate here that neither utrophin nor dystrophin are required for the expression of the cardiac DGC. However, alpha-dystroglycan (α-DG), a major component of the DGC, is differentially glycosylated in dystrophin-(mdx) and dystrophin−/utrophin− (dko) deficient mouse hearts. In both models the altered α-DG retains laminin binding activity, but has an altered localization at the sarcolemma. In hearts lacking both dystrophin and utrophin, the alterations in α-DG glycosylation are even more dramatic with changes in gel migration equivalent to 24 ± 3 kDa. These data show that the absence of dystrophin and utrophin alters the processing of α-DG; however it is not clear if these alterations are a consequence of the loss of a direct interaction with dystrophin/utrophin, or results from an indirect response to the presence of severe pathology. Recently there have been great advances in our understanding of the glycosylation of α-DG regarding its role as a laminin receptor. Here we present data that alterations in glycosylation occurs in the hearts of animal models of DMD, but these changes do not affect laminin binding. The physiological consequences of these alterations remain to be determined, but may have significant implications for the development of therapies for DMD.
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DOI:
10.1083/jcb.122.4.809
发表时间:
1993-08
期刊:
The Journal of cell biology
影响因子:
--
作者:
Ervasti JM;Campbell KP
通讯作者:
Campbell KP
影响因子:
4.8
作者:
Beedle, Aaron M.;Nienaber, Patricia M.;Campbell, Kevin P.
通讯作者:
Campbell, Kevin P.
DOI:
10.1083/jcb.115.2.411
发表时间:
1991-10
期刊:
The Journal of cell biology
影响因子:
--
作者:
Byers TJ;Kunkel LM;Watkins SC
通讯作者:
Watkins SC
影响因子:
64.5
作者:
Grady, RM;Teng, HB;Sanes, JR
通讯作者:
Sanes, JR
影响因子:
9.8
作者:
Brockington, M;Blake, DJ;Muntoni, F
通讯作者:
Muntoni, F