Muscular Dystrophy in mdx Mice Despite Lack of Neuronal Nitric Oxide Synthase

Muscular Dystrophy in mdx Mice Despite Lack of Neuronal Nitric Oxide Synthase
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尽管缺乏神经元一氧化氮合酶,mdx 小鼠仍出现肌肉营养不良

DOI:
10.1046/j.1471-4159.1998.71020784.x
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发表时间:
1998
影响因子:
4.7
通讯作者:
D. Bredt
D. Bredt
中科院分区:
医学2区
文献类型:
--
作者:
Daniel S. Chao;F. Silvagno;D. Bredt

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摘要:神经元一氧化氮合酶(nNOS)是骨骼肌肌营养不良蛋白复合物的组成部分。杜氏肌营养不良症和 mdx 小鼠中抗肌营养不良蛋白的缺失导致 nNOS 从质膜重新分布到肌细胞的细胞质中。细胞质中异常的 nNOS 活性可诱导自由基氧化,这对肌纤维有毒。为了验证杜氏营养不良症中 nNOS 分布紊乱介导肌肉损伤的假设,我们培育了抗肌营养不良蛋白缺陷型 mdx 雄性小鼠和缺乏 nNOS 的雌性 mdx 杂合子小鼠。我们发现 nNOS 的基因缺失本身不会引起可检测到的病理,并且 nNOS 的去除不会影响肌营养不良蛋白缺陷小鼠肌膜通透性增加的程度。因此,nNOS-肌营养不良蛋白双突变体的组织学分析显示出与肌营养不良蛋白单独突变相似的病理变化。综上所述,nNOS 缺陷本身不会在 mdx 模型中产生肌营养不良。
Abstract: Neuronal nitric oxide synthase (nNOS) is a component of the dystrophin complex in skeletal muscle. The absence of dystrophin protein in Duchenne muscular dystrophy and in mdx mouse causes a redistribution of nNOS from the plasma membrane to the cytosol in muscle cells. Aberrant nNOS activity in the cytosol can induce free radical oxidation, which is toxic to myofibers. To test the hypothesis that derangements in nNOS disposition mediate muscle damage in Duchenne dystrophy, we bred dystrophin‐deficient mdx male mice and female mdx heterozygote mice that lack nNOS. We found that genetic deletion of nNOS does not itself cause detectable pathology and that removal of nNOS does not influence the extent of increased sarcolemmal permeability in dystrophin‐deficient mice. Thus, histological analyses of nNOS‐dystrophin double mutants show pathological changes similar to the dystrophin mutation alone. Taken together, nNOS defects alone do not produce muscular dystrophy in the mdx model.
DOI: 10.1126/science.7522345
发表时间: 1994-09-23
期刊: SCIENCE
影响因子: 56.9
作者:
HUANG, ZH;HUANG, PL;MOSKOWITZ, MA
通讯作者: MOSKOWITZ, MA
DOI: 10.1073/pnas.90.8.3710
发表时间: 1993-04-15
影响因子: 11.1
作者:
PETROF, BJ;SHRAGER, JB;SWEENEY, HL
通讯作者: SWEENEY, HL