Ischemic preconditioning with a ketogenic diet improves brain ischemic tolerance through increased extracellular adenosine levels and hypoxia-inducible factors

Ischemic preconditioning with a ketogenic diet improves brain ischemic tolerance through increased extracellular adenosine levels and hypoxia-inducible factors
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生酮饮食的缺血预处理通过增加细胞外腺苷水平和缺氧诱导因子来改善脑缺血耐受性

DOI:
10.1016/j.brainres.2017.04.010
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发表时间:
2017-07
期刊:
影响因子:
2.9
通讯作者:
Cui Mei
Cui Mei
中科院分区:
医学3区
文献类型:
--
作者:
Yang Qi;Guo Min;Wang Xun;Zhao Yanxin;Zhao Qi;Ding Hongyan;Dong Qiang;Cui Mei

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缺血耐受减少脑缺血后的脑损伤和神经功能障碍。生酮饮食(KD)在几种神经退行性疾病中具有疾病改善作用。在这项研究中,我们喂养KD小鼠三周,并在动物中进行可逆性大脑中动脉闭塞(MCAO)。在缺血和再灌注期,KD能显著减少脑梗死体积,增加局部脑血流量(rCBF)和细胞外腺苷水平,体外和体内实验表明KD的神经保护作用是通过腺苷A1受体介导的。KD通过A1 R激活增加Akt和ERK 1/2磷酸化。此外,KD还能显著上调HIF-1α/HIF-2α和HIF调控基因VEGF、EPO的表达。KD预处理3周可改善MCAO小鼠的缺血耐受性。潜在的机制可能包括细胞外腺苷水平升高,通过A1腺苷受体激活增加Akt和ERK 1/2磷酸化,以及上调HIF和HIF调节基因。
Ischemic tolerance reduces brain damage and neurological dysfunction after brain ischemia. A ketogenic diet (KD) has disease-modifying effects in several neurodegenerative disorders. In this study, we fed mice with a KD for three weeks and performed reversible middle cerebral artery occlusion (MCAO) in the animals. KD-fed mice had a significantly reduced infarct volume, increased regional cerebral blood flow (rCBF) and extracellular adenosine levels in both the ischemic and the reperfusion phases.In vitroandin vivoexperiments revealed that the KD-induced neuroprotection was mediated through the adenosine A1 receptor. The KD increased Akt and ERK1/2 phosphorylation via A1R activation. Besides, the KD also upregulated robustly HIF-1α/HIF-2α and HIF regulated genes, such asVEGFandEPO. A three-week preconditioning period with a KD improved ischemic tolerance in mice with MCAO. The underlying mechanisms might include elevated extracellular adenosine levels, and increased Akt and ERK1/2 phosphorylation via A1 adenosine receptor activation, together with upregulated HIFs and HIF-regulated genes.
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