Determination of RNA content in postischemic gerbil brain by in situ hybridization.

Metabolic Brain Disease
Y X XieK A Hossmann

Abstract

Brief periods of cerebral ischemia result in prolonged inhibition of protein synthesis. In CA1 sector of hippocampus inhibition is irreversible, leading to delayed death of pyramidal neurons. In order to study the possible role of gene transcription in this process, expression of four individual RNAs was investigated in the gerbil brain after 5 min of global cerebral ischemia by in situ hybridization with the following nucleic acid probes: plasmid pMr100 (ribosomal RNA sequences), plasma pAG82 (cytochrome c oxidase sequences), plasmid p629 (amyloid A4 precursor protein of Alzheimer's disease, pre-A4 protein), and plasmid pHF beta A-1 (beta-actin sequences). Cytochrome c oxidase mRNA and ribosomal RNA did not show any changes in expression up to 48 hr after ischemia. After longer recirculation times they gradually declined in the CA1 sector of hippocampus in parallel with the morphological manifestation of delayed neuronal death. The pre-A4 mRNA transiently decreased after 8 hr of recirculation of the CA1 sector but then recovered before it finally disappeared in parallel with delayed neuronal death. The beta-actin mRNA transiently appeared to increase after 8 hr of recirculation in the stratum radiatum of hippocampus but then a...Continue Reading

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