Texture analysis of poly-adenylated mRNA staining following global brain ischemia and reperfusion.

Texture analysis of poly-adenylated mRNA staining following global brain ischemia and reperfusion.
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全脑缺血和再灌注后聚腺苷酸化 mRNA 染色的纹理分析。

DOI:
10.1016/j.cmpb.2011.03.005
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发表时间:
2012-01
影响因子:
6.1
通讯作者:
DeGracia DJ
DeGracia DJ
中科院分区:
工程技术2区
文献类型:
--
作者:
Szymanski JJ;Jamison JT;DeGracia DJ

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纹理分析提供了一种量化显微镜图像中复杂变化的方法。我们以前发现,在缺血后的神经元中,细胞质中的多聚腺苷酸化的mRNAs形成了mRNAs颗粒,这些颗粒与蛋白质合成抑制相关,从而导致细胞死亡。在这里,我们利用纹理分析软件Mazda对常温全脑缺血10分钟再灌注约1小时大鼠海马区CA3区锥体细胞层的光显微图像中的mRNA颗粒进行了定量。在再灌流1小时时,我们观察到不同样本中信使核糖核酸颗粒质地的变化,这些变化很容易通过质地分析来量化。个体样本的差异与这样的解释一致,即动物对动物的mRNA颗粒差异反映了mRNA颗粒形成的时间过程。我们还使用质构分析来量化放线菌酮在脑缺血前或脑缺血后给药对mRNA颗粒的影响。如果在缺血前给药,放线菌酮抑制了mRNA颗粒的形成,但如果在缺血后给药,则不能阻止mRNA颗粒的形成,这表明mRNA颗粒的形成依赖于多聚体的解离。我们的结论是,纹理分析是量化脑缺血和再灌注引起的神经元复杂形态变化的有效手段。
Texture analysis provides a means to quantify complex changes in microscope images. We previously showed that cytoplasmic poly-adenylated mRNAs form mRNA granules in post-ischemic neurons and that these granules correlated with protein synthesis inhibition and hence cell death. Here we utilized the texture analysis software MaZda to quantify mRNA granules in photomicrographs of the pyramidal cell layer of rat hippocampal region CA3 around 1 hour of reperfusion after 10 min of normothermic global cerebral ischemia. At 1 hour reperfusion, we observed variations in the texture of mRNA granules amongst samples that were readily quantified by texture analysis. Individual sample variation was consistent with the interpretation that animal-to-animal variations in mRNA granules reflected the time-course of mRNA granule formation. We also used texture analysis to quantify the effect of cycloheximide, given either before or after brain ischemia, on mRNA granules. If administered before ischemia, cycloheximide inhibited mRNA granule formation, but if administered after ischemia did not prevent mRNA granulation, indicating mRNA granule formation is dependent on dissociation of polysomes. We conclude that texture analysis is an effective means for quantifying the complex morphological changes induced in neurons by brain ischemia and reperfusion.
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