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
Townsend, DeWayne
中科院分区:
生物学3区
文献类型:
--
作者:
Sharpe, Katharine M.;Premsukh, Monica D.;Townsend, DeWayne

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心脏病是杜氏肌营养不良症(DMD)患者死亡的主要原因。DMD患者缺乏广泛表达于横纹肌的抗肌萎缩蛋白。在骨骼肌中,肌营养不良蛋白的缺失会导致肌营养不良蛋白相关糖蛋白复合物(DGC)的表达显着减少。有趣的是,在心脏中,DGC通常在没有肌营养不良蛋白的情况下表达;这归因于肌营养不良蛋白同源物utrophin的存在。我们在这里证明,无论是utrophin,也不肌营养不良蛋白是必需的心脏DGC的表达。然而,α-肌营养不良蛋白聚糖(α-DG)是DGC的主要成分,在肌营养不良蛋白-(mdx)和肌营养不良蛋白-/utrophin-(dko)缺陷小鼠心脏中的糖基化差异。在这两种模型中,改变的α-DG保留层粘连蛋白结合活性,但在肌膜上的定位改变。在缺乏肌营养不良蛋白和肌营养不良蛋白的心脏中,α-DG糖基化的变化甚至更显著,凝胶迁移的变化相当于24 ± 3 kDa。这些数据表明,肌营养不良蛋白和肌营养不良蛋白的缺失改变了α-DG的加工;然而,尚不清楚这些改变是与肌营养不良蛋白/肌营养不良蛋白直接相互作用丧失的结果,还是对严重病理的间接反应。近年来,α-DG作为层粘连蛋白受体的糖基化研究取得了很大进展。在这里,我们提出的数据,糖基化的改变发生在DMD动物模型的心脏,但这些变化不影响层粘连蛋白的结合。这些改变的生理后果仍有待确定,但可能对DMD治疗的发展具有重要意义。
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.
DOI: 10.1083/jcb.122.4.809
发表时间: 1993-08
期刊: The Journal of cell biology
影响因子: --
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Ervasti JM;Campbell KP
通讯作者: Campbell KP
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发表时间: 2007-06-08
影响因子: 4.8
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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
DOI: 10.1016/s0092-8674(00)80533-4
发表时间: 1997-08-22
期刊: CELL
影响因子: 64.5
作者:
Grady, RM;Teng, HB;Sanes, JR
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DOI: 10.1086/324412
发表时间: 2001-12-01
影响因子: 9.8
作者:
Brockington, M;Blake, DJ;Muntoni, F
通讯作者: Muntoni, F