Derangements of post-ischemic cerebral blood flow by protein kinase C delta.

Derangements of post-ischemic cerebral blood flow by protein kinase C delta.
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DOI:
10.1016/j.neuroscience.2010.08.058
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发表时间:
2010-12-01
期刊:
影响因子:
3.3
通讯作者:
Perez-Pinzon MA
Perez-Pinzon MA
中科院分区:
医学3区
文献类型:
--
作者:
Lin HW;Defazio RA;Della-Morte D;Thompson JW;Narayanan SV;Raval AP;Saul I;Dave KR;Perez-Pinzon MA

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脑缺血引起以充血(脑血流量增加,CBF)和随后的灌注不足(CBF减少)为特征的血流紊乱。我们以前证明,蛋白激酶C δ(δPKC)在缺血后海马神经元死亡中起重要作用。然而,这种保护作用是否部分是由于脑缺血后δPKC对CBF的作用仍然知之甚少。我们假设δPKC加剧充血和随后的低灌注,导致缺血后CBF紊乱。用δPKC特异性抑制剂(δV1-1,0.5 mg/kg)预处理的Sprague-Dawley(SD)大鼠表现出充血和潜伏性低灌注的减弱,其特征在于双血管闭塞后的血管收缩和微血管舒张加上双光子显微镜测量的低血压。在窒息性心脏骤停模型(ACA)中,缺血前和缺血后给予δV1-1治疗的SD大鼠在ACA后24小时表现出灌注改善,并在ACA后7天表现出较少的海马CA 1神经元死亡。这些结果提示δPKC在调节脑缺血后CBF和神经元损伤中可能具有治疗潜力。
Cerebral ischemia causes blood flow derangements characterized by hyperemia (increased cerebral blood flow, CBF) and subsequent hypoperfusion (decreased CBF). We previously demonstrated that protein kinase C delta (δPKC) plays an important role in hippocampal neuronal death after ischemia. However, whether part of this protection is due to the role of δPKC on CBF following cerebral ischemia remains poorly understood. We hypothesized that δPKC exacerbates hyperemia and subsequent hypoperfusion resulting in CBF derangements following ischemia. Sprague-Dawley (SD) rats pretreated with a δPKC specific inhibitor (δV1-1, 0.5 mg/kg) exhibited attenuation of hyperemia and latent hypoperfusion characterized by vasoconstriction followed by vasodilation of microvessels after 2-vessel occlusion plus hypotension measured by 2-photon microscopy. In an asphyxial cardiac arrest model (ACA), SD rats treated with δV1-1 (pre- and post-ischemia) exhibited improved perfusion after 24 hrs and less hippocampal CA1 neuronal death 7 days after ACA. These results suggest possible therapeutic potential of δPKC in modulating CBF and neuronal damage after cerebral ischemia.
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