Interference of the Apoptotic Signaling Pathway in RGC Stress Response by SP600125 in Moderate Ocular Hypertensive Rats

Hong-Xia Liu ； Hui Sun ； Chuan-Yong Liu

《The Chinese Journal of Physiology》 54卷2期 (2011/04) Pp. 124-132

https://doi.org/10.4077/CJP.2011.AMM067

並列摘要

The aim of the present study was to investigate the effect of SP600125 (1,9-pyrazoloanthrone), an inhibitor of JNK, on apoptosis of retinal ganglion cells (RGCs) induced by moderate elevation of intraocular pressure (IOP) in male rats. IOP was elevated by suture-pulley compression on eyeballs. Cell apoptosis, expression of phosphorylated JNK (p-JNK) and cleaved caspase-3 in retina were studied by TUNEL staining and immunohistochemistry. The expression of c-Jun in retina was assayed by Western blot. Following IOP elevation (about 45 mmHg) for 6 h, the number of TUNEL, p-JNK and cleaved caspase-3 positive cells and the amount of c-Jun expression in retina were significantly increased. All these changes were reversed by SP600125 treatment. The immune positive cells for TUNEL, p-JNK and cleaved caspase-3 following IOP elevation were localized at the RGC layer. We conclude that moderate elevation of IOP for 6 h induced apoptosis of RGCs, and SP600125 treatment attenuated this process by suppressing c-Jun expression.

並列關鍵字

apoptosis ； IOP ； glaucoma ； retinal ganglion cell

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