首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >IGF-I Gene Therapy in Aging Rats Modulates Hippocampal Genes Relevant to Memory Function
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IGF-I Gene Therapy in Aging Rats Modulates Hippocampal Genes Relevant to Memory Function

机译:衰老大鼠的IGF-I基因治疗调节与记忆功能相关的海马基因

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In rats, learning and memory performance decline during normal aging, which makes this rodent species a suitable model to evaluate therapeutic strategies. In aging rats, insulin-like growth factor-I (IGF-I), is known to significantly improve spatial memory accuracy as compared to control counterparts. A constellation of gene expression changes underlie the hippocampal phenotype of aging but no studies on the effects of IGF-I on the hippocampal transcriptome of old rodents have been documented. Here, we assessed the effects of IGF-I gene therapy on spatial memory performance in old female rats and compared them with changes in the hippocampal transcriptome. In the Barnes maze test, experimental rats showed a significantly higher exploratory frequency of the goal hole than controls. Hippocampal RNA-sequencing showed that 219 genes are differentially expressed in 28-month-old rats intracerebroventricularly injected with an adenovector expressing rat IGF-I as compared with placebo adenovector-injected counterparts. From the differentially expressed genes, 81 were down and 138 upregulated. From those genes, a list of functionally relevant genes, concerning hippocampal IGF-I expression, synaptic plasticity as well as neuronal function was identified. Our results provide an initial glimpse at the molecular mechanisms underlying the neuroprotective actions of IGF-I in the aging brain.
机译:在大鼠中,正常衰老期间学习和记忆能力下降,这使这种啮齿类动物成为评估治疗策略的合适模型。在老龄大鼠中,与对照组相比,胰岛素样生长因子-I(IGF-I)可以显著提高空间记忆的准确性。一系列基因表达变化是海马衰老表型的基础,但没有关于IGF-I对老年啮齿类动物海马转录组影响的研究。在此,我们评估了IGF-I基因治疗对老年雌性大鼠空间记忆能力的影响,并将其与海马转录组的变化进行了比较。在巴恩斯迷宫测试中,实验大鼠对目标洞的探索频率明显高于对照组。海马RNA测序显示,与安慰剂腺载体注射组相比,在侧脑室注射表达大鼠IGF-I的腺载体的28个月大鼠中,219个基因的表达存在差异。在差异表达基因中,81个表达下调,138个表达上调。从这些基因中,确定了一系列功能相关基因,涉及海马IGF-I表达、突触可塑性以及神经元功能。我们的研究结果初步揭示了IGF-I在衰老大脑中神经保护作用的分子机制。

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