Retinoic acid receptor α expression exerts an anti‑apoptosis effect on PC12 cells following oxygen‑glucose deprivation

Dong,Wanliang; Zhang,Yuankun

doi:10.3892/etm.2018.6639

Retinoic acid receptor α expression exerts an anti‑apoptosis effect on PC12 cells following oxygen‑glucose deprivation

Authors:
- Wanliang Dong
- Yuankun Zhang
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Affiliations: Department of Neurology, The Second Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450014, P.R. China, Department of Cardiovascular Internal Medicine, People's Hospital of Zhengzhou, Zhengzhou, Henan 450053, P.R. China
Published online on: August 22, 2018 https://doi.org/10.3892/etm.2018.6639
Pages: 3525-3533
Copyright: © Dong et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 4.0].

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Abstract

It has been established that the primary form of neuron death following hypoxic ischemic brain damage is apoptosis. Imbalances in the expression of genes in the B‑cell lymphoma 2 (Bcl‑2) family located in the mitochondrion, and in the expression of their encoded proteins, are key events in the mitochondrial apoptotic pathway, which lead to damage of cellular structure and function. The present study aimed to explore the regulatory effect of retinoic acid receptor α (RAR‑α) on the apoptosis of PC12 cells induced by oxygen‑glucose deprivation (OGD) in the retinoic acid signaling pathway. Recombinant adenovirus RAR‑α small interfering RNA (Ad‑siRAR‑α) was used to transduce PC12 cells, and the efficiency of RAR‑α expression inhibition was detected by semi‑quantitative reverse transcription polymerase chain reaction (RT‑PCR). An empty adenovirus vector was transfected in PC12 cells, which were used as the control. Flow cytometry with Annexin V‑propidium iodide (PI) and fluorescence probe JC‑1 staining was used to detect the apoptosis rate and mitochondrial transmembrane potential (MMP), respectively, of PC12 cells after transduction with Ad‑siRAR‑α. Furthermore, the expression levels of key genes in the RAR‑α and mitochondrial apoptotic pathway, Bcl‑2 and Bcl‑2‑associated protein (Bax) were analyzed by RT‑quantitative (q)PCR and western blot analysis. RAR‑α mRNA expression was observed to be decreased in PC12 cells following OGD‑induced injury, and this decrease can be reversed by 4 µmol/l ATRA treatment. After 36 h transfection with Ad‑siRAR‑α, RAR‑α gene expression was significantly inhibited compared with the control (P<0.05). The results of Annexin V‑PI, fluorescence probe JC‑1 staining and flow cytometry demonstrated that the apoptosis rate significantly increased and MMP significantly decreased in OGD‑induced PC12 cells following transduction with Ad‑siRAR‑α compared with the control (both P<0.05). RT‑qPCR and western blot analysis indicated that Bax expression was significantly increased and Bcl‑2 expression was significantly decreased in PC12 cells transduced with Ad‑siRAR‑α after OGD‑induced injury at the mRNA and protein level (P<0.05). In conclusion, Ad‑siRAR‑α transduction could promote apoptosis in OGD‑induced PC12 cells. This suggests that the expression of Bax and Bcl‑2 in the mitochondrial apoptosis signaling pathway is, at least in part, mediated by RAR‑α expression, thereby indicating that RAR‑α expression exerts an anti‑apoptotic effect on OGD‑damaged PC12 cells.

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