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首页> 外文期刊>The European Journal of Neuroscience >The mammalian homologue of the novel peptide Bv8 is expressed in the central nervous system and supports neuronal survival by activating the MAP kinase/PI-3-kinase pathways.
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The mammalian homologue of the novel peptide Bv8 is expressed in the central nervous system and supports neuronal survival by activating the MAP kinase/PI-3-kinase pathways.

机译:新肽Bv8的哺乳动物同源物在中枢神经系统中表达,并通过激活MAP激酶/ PI-3-激酶途径支持神经元存活。

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摘要

Previous studies have identified the mammalian homologue of Bv8 (mBv8), a small protein originally isolated from skin secretions of the frog, Bombina variegata. In situ hybridization showed that mBv8 RNA was widely expressed in the rodent CNS, with high levels being detected in layer II of the cerebral cortex, limbic regions, cerebellar Purkinje cells, and dorsal and ventral horns of the spinal cord. A similar pattern of distribution was found by examining the presence of mBv8 protein by immunocytochemistry. Addition of frog Bv8 to cultured cerebellar granule cells reduced the extent of apoptotic death induced by switching the growing medium from 25 to 5 mM K+. Bv8 could also protect cultured cortical neurons against excitotoxic death. Both effects were prevented by PD98059 and LY294002, which inhibit the mitogen-activated protein kinase (MAPK) and phosphatidylinositol-3-kinase (PI-3-K) pathways, respectively. In cultured cerebellar granule cells, Bv8 stimulated both the MAPK and the PI-3-K pathways, as revealed by Western blot analysis of phosphorylated p44/p42 MAPKs and phosphorylated Akt, respectively. We conclude that mBv8 acts as an endogenous neurotrophic factor and supports neuronal survival through the activation of the MAPK/PI-3-K pathways.
机译:先前的研究已经确定了哺乳动物Bv8(mBv8)的同源物,Bv8是一种最初从青蛙皮肤变种Bombina variegata的皮肤分泌物中分离的小蛋白质。原位杂交表明,mBv8 RNA在啮齿动物中枢神经系统中广泛表达,在大脑皮层的第二层,边缘区域,小脑浦肯野细胞以及脊髓的背和腹角中均检测到高水平的RNA。通过免疫细胞化学检查mBv8蛋白的存在,发现了类似的分布模式。将青蛙Bv8添加到培养的小脑颗粒细胞中,可降低将生长培养基从25 mM K +转换为5 mM K +诱导的凋亡死亡程度。 Bv8还可以保护培养的皮质神经元免受兴奋性毒性死亡。 PD98059和LY294002阻止了这两种作用,它们分别抑制有丝分裂原激活的蛋白激酶(MAPK)和磷脂酰肌醇-3-激酶(PI-3-K)途径。在培养的小脑颗粒细胞中,Bv8刺激了MAPK和PI-3-K通路,分别通过磷酸化p44 / p42 MAPK和磷酸化Akt的蛋白质印迹分析揭示。我们得出结论,mBv8充当内源性神经营养因子,并通过激活MAPK / PI-3-K途径支持神经元存活。

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