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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Bax deletion prevents neuronal loss but not neurological symptoms in a transgenic model of inherited prion disease.
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Bax deletion prevents neuronal loss but not neurological symptoms in a transgenic model of inherited prion disease.

机译:在遗传性病毒疾病的转基因模型中,Bax缺失可防止神经元丢失,但不能防止神经系统症状。

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摘要

Transgenic Tg(PG14) mice express a mutant prion protein containing 14 octapeptide repeats, whose human homologue is associated with an inherited prion dementia. These mice develop a progressive neurological disorder characterized by ataxia and cerebellar atrophy, with massive apoptotic degeneration of granule neurons. Bax, a proapoptotic gene of the Bcl-2 family, plays a key role in regulating cell death in the nervous system. To analyze the role of Bax in the Tg(PG14) phenotype, we crossed Tg(PG14) mice with Bax(-/-) mice to obtain Tg(PG14)/Bax(-/-) offspring. Bax deletion effectively rescued cerebellar granule neurons from apoptosis, implying that these cells die via a Bax-dependent process. Surprisingly, however, the age at which symptoms began and the duration of the clinical phase of the illness were not altered in Tg(PG14)/Bax(-/-) mice. In addition, Bax deletion failed to prevent shrinkage of the molecular layer of the cerebellum and loss of synaptophysin-positive synaptic endings. Our analysis indicates that synaptic loss makes a critical contribution to the Tg(PG14) phenotype. These results provide insights into the pathogenesis of prion diseases and have important implications for the treatment of these disorders.
机译:转基因Tg(PG14)小鼠表达包含14个八肽重复序列的突变病毒蛋白,其人类同源物与遗传的ion病毒痴呆症相关。这些小鼠发展为以共济失调和小脑萎缩为特征的进行性神经系统疾病,伴有大量的颗粒神经元凋亡。 Bax是Bcl-2家族的促凋亡基因,在调节神经系统细胞死亡中起关键作用。为了分析Bax在Tg(PG14)表型中的作用,我们将Tg(PG14)小鼠与Bax(-/-)小鼠杂交以获得Tg(PG14)/ Bax(-/-)后代。 Bax删除有效挽救了小脑颗粒神经元免于凋亡,这意味着这些细胞通过Bax依赖性过程而死亡。然而,令人惊讶的是,在Tg(PG14)/ Bax(-/-)小鼠中,症状开始的年龄和疾病临床阶段的持续时间没有改变。另外,Bax缺失不能防止小脑分子层的收缩和突触素阳性突触末端的丢失。我们的分析表明,突触丧失对Tg(PG14)表型做出了重要贡献。这些结果为into病毒疾病的发病机理提供了见识,并对这些疾病的治疗具有重要意义。

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