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Protective Effect of Perilla frutescens Extract against Oxidative Stress-Induced Cell Death in a Staurosporine-Differentiated Retinal Ganglion Cell Line

Staurosporine에 의해 분화된 망막신경절세포에서 산화 스트레스 유도 세포사멸에 대한 차조기 추출물의 보호 효능

  • Received : 2016.11.10
  • Accepted : 2017.01.23
  • Published : 2017.02.28

Abstract

In this study, we examined the effect of Perilla frutescens extract (PFE) on oxidative stress-induced cell death in RGC-5 cell lines. Staurosporine-differentiated RGC-5 (ssdRGC-5) cells obtained by treating RGC-5 cells with $1{\mu}M$ staurosporine were incubated with PFE for 30 min and then exposed to buthionine sulfoximine plus glutamate (B/G) for 20 h. Cell death was detected using lactate dehydrogenase release assay and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide reduction assay. To investigate the mechanism underlying cell death, we determined caspase-3 activity, level of reactive oxygen species (ROS) formation, and expression levels of cytoplasmic cytochrome c and mitochondrial Bax. Treatment of ssdRGC-5 cells with B/G increased intracellular ROS and induced apoptosis with increasing caspase-3 activity. PFE rescued ssdRGC-5 cells from oxidative stress-induced cell death by inhibiting intracellular ROS production and caspase-3 activation and regulating apoptosis-related proteins such as cytochrome c and Bax. These findings suggest that PFE may have a beneficial neuroprotective effect against oxidative stress-induced apoptotic death in ssdRGC-5 cells.

본 연구에서는 산화적 스트레스로 유도한 시신경 세포사멸에 대한 차조기 물 추출물(PFE)의 효과를 확인하였다. Staurosporine으로 분화된 ssdRGC-5 세포에 buthionine과 glutamate(B/G)로 산화적 스트레스를 유도하였으며, LDH release assay, MTT reduction assay를 통하여 PFE가 농도 의존적으로 B/G에 의한 세포사멸을 억제함을 관찰하였다. 세포사멸의 기전을 연구하기 위해 caspase 활성, 세포 내 ROS 생성량, 세포고사 관련 단백질 발현을 관찰한 결과, B/G에 의해 증가한 ROS 생성량, caspase 활성을 PFE가 억제하였고, 세포질로 방출된 cytochrome c와 미토콘드리아로 이동한 Bax도 감소함을 확인하였다. 이상의 결과로부터 차조기는 산화적 스트레스로 유도된 시신경 세포사멸 과정에서 항산화 효과와 미토콘드리아성 세포사멸을 완화함으로써 세포 보호 작용을 나타냄을 확인하였다.

Keywords

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