Animal models for muscular dystrophy show different patterns of sarcolemmal disruption.

Animal models for muscular dystrophy show different patterns of sarcolemmal disruption.
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肌肉营养不良的动物模型显示出不同的肌膜破坏模式。

DOI:
10.1083/jcb.139.2.375
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发表时间:
1997-10-20
影响因子:
7.8
通讯作者:
Campbell, KP
Campbell, KP
中科院分区:
生物学1区
文献类型:
--
作者:
Straub, V;Rafael, JA;Chamberlain, JS;Campbell, KP

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一些营养不良蛋白-糖蛋白复合物(DGC)成分的遗传缺陷导致不同形式的肌肉营养不良。然而,对于DGC的改变是如何在营养不良肌肉组织的病理生理中表现出来的,我们知之甚少。一种假设是DGC保护肌膜免受收缩引起的损伤。使用示踪分子,我们比较了肌肉萎缩症动物模型和肌肉萎缩症患者样本的肌上皮完整性。埃文斯蓝是一种低分子量重氮染料,在正常小鼠体内不会进入骨骼肌纤维。相反,mdx小鼠,杜氏肌营养不良症的营养不良蛋白缺乏动物模型,在骨骼肌纤维中显示明显的埃文斯蓝积累。我们还研究了携带不同抗肌营养不良蛋白突变的转基因小鼠的Evans蓝分散,我们证明了抗肌营养不良蛋白的细胞骨架和肌上皮附着可能是防止严重纤维损伤的必要条件。转基因小鼠中染料掺入的程度与人类中类似肌营养不良蛋白突变的表型严重程度相关。我们进一步评估了埃文斯蓝在肌营养不良(dy/dy)小鼠骨骼肌及其较温和的等位变异dy2J/dy2J小鼠(先天性肌营养不良动物模型)骨骼肌中的掺入。令人惊讶的是,这些在层粘连蛋白α2链(DGC的细胞外配体)上有缺陷的小鼠,在其骨骼肌中显示出很少的埃文斯蓝积累。综上所述,这些结果表明先天性肌营养不良的致病机制与杜氏肌营养不良不同,尽管主要缺陷起源于与同一蛋白复合物相关的两种成分。
Genetic defects in a number of components of the dystrophin–glycoprotein complex (DGC) lead to distinct forms of muscular dystrophy. However, little is known about how alterations in the DGC are manifested in the pathophysiology present in dystrophic muscle tissue. One hypothesis is that the DGC protects the sarcolemma from contraction-induced damage. Using tracer molecules, we compared sarcolemmal integrity in animal models for muscular dystrophy and in muscular dystrophy patient samples. Evans blue, a low molecular weight diazo dye, does not cross into skeletal muscle fibers in normal mice. In contrast, mdx mice, a dystrophin-deficient animal model for Duchenne muscular dystrophy, showed significant Evans blue accumulation in skeletal muscle fibers. We also studied Evans blue dispersion in transgenic mice bearing different dystrophin mutations, and we demonstrated that cytoskeletal and sarcolemmal attachment of dystrophin might be a necessary requirement to prevent serious fiber damage. The extent of dye incorporation in transgenic mice correlated with the phenotypic severity of similar dystrophin mutations in humans. We furthermore assessed Evans blue incorporation in skeletal muscle of the dystrophia muscularis (dy/dy) mouse and its milder allelic variant, the dy2J/dy2J mouse, animal models for congenital muscular dystrophy. Surprisingly, these mice, which have defects in the laminin α2-chain, an extracellular ligand of the DGC, showed little Evans blue accumulation in their skeletal muscles. Taken together, these results suggest that the pathogenic mechanisms in congenital muscular dystrophy are different from those in Duchenne muscular dystrophy, although the primary defects originate in two components associated with the same protein complex.
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
DOI: 10.1093/brain/102.1.147
发表时间: 1979-01-01
期刊: BRAIN
影响因子: 14.5
作者:
CARPENTER, S;KARPATI, G
通讯作者: KARPATI, G
DOI: 10.1046/j.1365-201x.1996.201000.x
发表时间: 1996-03-01
期刊: ACTA PHYSIOLOGICA SCANDINAVICA
影响因子: --
作者:
Gillis, JM
通讯作者: Gillis, JM
DOI: 10.1212/wnl.25.12.1111
发表时间: 1975-01-01
期刊: NEUROLOGY
影响因子: 9.9
作者:
MOKRI, B;ENGEL, AG
通讯作者: ENGEL, AG
在肌动蛋白结合结构域中表达肌营养不良蛋白的转基因MDX小鼠表现出“轻度贝克”表型。
DOI: 10.1083/jcb.134.4.873
发表时间: 1996-08
影响因子: 7.8
作者:
Corrado, K;Rafael, JA;Mills, PL;Cole, NM;Faulkner, JA;Wang, K;Chamberlain, JS
通讯作者: Chamberlain, JS