Receptor interacting protein kinases mediate retinal detachment-induced photoreceptor necrosis and compensate for inhibition of apoptosis

George Trichonas, Yusuke Murakami, Aristomenis Thanos, Yuki Morizane, Maki Kayama, Christine M. Debouck, Toshio Hisatomi, Joan W. Miller, Demetrios G. Vavvas

研究成果: ジャーナルへの寄稿学術誌査読

269 被引用数 (Scopus)

抄録

Apoptosis has been shown to be a significant form of cell loss in many diseases. Detachment of photoreceptors from the retinal pigment epithelium, as seen in various retinal disorders, causes photoreceptor loss and subsequent vision decline. Although caspasedependent apoptotic pathways are activated after retinal detachment, caspase inhibition by the pan-caspase inhibitor Z-VAD fails to prevent photoreceptor death; thus,weinvestigated other pathways leading to cell loss. Here, we show that receptor interacting protein (RIP) kinase-mediated necrosis is a significant mode of photoreceptor cell loss in an experimental model of retinal detachment and when caspases are inhibited, RIP-mediated necrosis becomes the predominant form of death. RIP3 expression, a key activator of RIP1 kinase, increased more than 10-fold after retinal detachment. Morphological assessment of detached retinas treated with Z-VAD showed decreased apoptosis but significantly increased necrotic photoreceptor death. RIP1 kinase inhibitor necrostatin-1 or Rip3 deficiency substantially prevented those necrotic changes and reduced oxidative stress andmitochondrial release of apoptosis-inducing factor. Thus, RIP kinase-mediated programmed necrosis is a redundant mechanism of photoreceptor death in addition to apoptosis, and simultaneous inhibition of RIP kinases and caspases is essential for effective neuroprotection and may be a novel therapeutic strategy for treatment of retinal disorders.

本文言語英語
ページ(範囲)21695-21700
ページ数6
ジャーナルProceedings of the National Academy of Sciences of the United States of America
107
50
DOI
出版ステータス出版済み - 12月 14 2010
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 一般

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