Abstract
Lack of recovery from protein synthesis inhibition (PSI) closely correlates with neuronal death following brain ischemia and reperfusion. It has therefore been suggested that understanding the mechanisms of PSI will shed light on the mechanisms of selective neuronal death following ischemia and reperfusion. It is now known that the PKR-like ER kinase (PERK)-mediated phosphorylation of eukaryotic initiation factor 2alpha (eIF2alpha) causes translation inhibition at initial reperfusion. Activation of PERK, in turn, indicates endoplasmic reticulum stress and activation of the unfolded protein response. However, phosphorylation of eIF2alpha is a transient event and can account for PSI only in the initial hours of reperfusion. Although a number of other regulators of protein synthesis, such as eIF4F, 4EBP-1, eEF-2, and S6 kinase, have been assessed following cerebral ischemia and reperfusion, the causes of prolonged PSI have yet to be fully elucidated. The purpose of the present article is to bring together the evidence indicating that, at minimum, postischemic PSI should be conceptualized as consisting of two components: an acute, transient component mediated by unfolded protein response-induced eIF2alpha phosphorylation and a long...Continue Reading
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