Linked Life Data

11299309

Source:http://linkedlifedata.com/resource/pubmed/id/11299309

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pubmed-article:11299309pubmed:abstractTextEmerging evidence supports an important role for caspases in neuronal death following ischemia-reperfusion injury. This study assessed whether cell specific caspases participate in neuronal degeneration and whether caspase inhibition provides neuroprotection following transient retinal ischemia. We utilized a model of transient global retinal ischemia. The spatial and temporal pattern of the active forms of caspase 1, 2 and 3 expression was determined in retinal neurons following ischemic injury. Double-labeling with cell-specific markers identified which cells were expressing different caspases. In separate experiments, animals received various caspase inhibitors before the induction of ischemia. Sixty minutes of ischemia resulted in a delayed, selective neuronal death of the inner retinal layers at 7 days. Expression of caspase 1 was not detected at any time point. Maximal expression of caspase 2 was found at 24 h primarily in the inner nuclear and ganglion cell layers of the retina and localized to ganglion and amacrine neurons. Caspase 3 also peaked at 24 h in both the inner nuclear and outer nuclear layers and was predominantly expressed in photoreceptor cells and to a lesser extent in amacrine neurons. The pan caspase inhibitor, Boc-aspartyl fmk, or an antisense oligonucleotide inhibitor of caspase 2 led to significant histopathologic and functional improvement (electroretinogram) at 7 days. No protection was found with the caspase 1 selective inhibitor, Y-vad fmk. These observations suggest that ischemia-reperfusion injury activates different caspases depending on the neuronal phenotype in the retina and caspase inhibition leads to both histologic preservation and functional improvement. Caspases 2 and 3 may act in parallel in amacrine neurons following ischemia-reperfusion. These results in the retina may shed light on differential caspase specificity in global cerebral ischemia.lld:pubmed
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pubmed-article:11299309pubmed:dateRevised2007-11-14lld:pubmed
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pubmed-article:11299309pubmed:articleTitleCell-specific caspase expression by different neuronal phenotypes in transient retinal ischemia.lld:pubmed
pubmed-article:11299309pubmed:affiliationDepartment of Neurology, Albert Einstein College of Medicine, Bronx, New York, USA.lld:pubmed
pubmed-article:11299309pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11299309pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
pubmed-article:11299309pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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