Influence of chemical and ischemic preconditioning on cytokine expression after focal brain ischemia

Journal of Neuroscience Research
Joanna PeraAndrzej Szczudlik

Abstract

Inflammation, upregulation of cytokines, proapoptotic molecules, and apoptosis are accepted widely as crucial players in stroke-induced brain damage. Induction of brain tolerance against ischemia by pretreatment with nonlethal stressors (preconditioning) has been found to influence expression of different molecules, in addition to reduction of infarct size. It remains unclear, however, whether and how preconditioning changes expression of cytokines after subsequent brain ischemia. We sought to analyze cortical expression of interleukin (IL)-1beta, IL-6, tumor necrosis factor (TNF)-alpha, transforming growth factor (TGF)-beta, Fas, and Fas ligand (FasL) mRNA after a transient, focal brain ischemia in rats subjected to preconditioning. The mRNA levels were determined using a semiquantitative RT-PCR in the ischemic and contralateral cortex, separately. Transient ischemia was induced by 90-min middle cerebral artery occlusion (MCAo) and neurologic deficits as well as infarct size were quantified. Preconditioning was carried out by a short-term MCAo or an injection of 3-nitropropionic acid 3 days before MCAo. In both preconditioning paradigms, similar effects on investigated mRNA levels were observed. IL-1beta and IL-6 levels were d...Continue Reading

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Citations

Apr 12, 2008·Purinergic Signalling·Maria P Abbracchio, Stefania Ceruti
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