tailieunhanh - Báo cáo y học: "Autophagy in rat annulus fibrosus cells: evidence and possible implications"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành y đề tài: Autophagy in rat annulus fibrosus cells: evidence and possible implications. | Shen et al. Arthritis Research Therapy 2011 13 R132 http content 13 4 R132 RESEARCH ARTICLE Open Access Autophagy in rat annulus fibrosus cells evidence and possible implications Chao Shen Jun Yan Lei-Sheng Jiang and Li-Yang Dai Abstract Introduction Programmed cell death of intervertebral disc IVD cells plays an important role in IVD degeneration but the role of autophagy a closely related cell death event in IVD cells has not been documented. The current study was designed to investigate the effect of interleukin IL -1b on the occurrence of autophagy of rat annulus fibrosus AF cells and the interrelationship between autophagy and apoptosis. Methods Rat AF cells were isolated and exposed in tissue cultures with or without serum to IL-1P in different concentrations for 24 hours. Ultrastructural analysis flow cytometry and lysosomal activity assessment were performed after the in vitro treatment to determine the presence and levels of autophagy. The mRNA expression of autophagy-related proteins Beclin-1 Bcl-2 and microtubule associated protein 1 light chain 3 LC3 were evaluated using real-time PCR. 3-methyladenine 3-MA a PI3K inhibitor was used to determine the interaction between autophagy and apoptosis via the suppression of autophagy. Results Autophagy was detected in rat AF cells under serum starvation condition by transmission electron microscopy. PCR and flow cytometry results showed that IL-1P enhanced the autophagy-induction effect of serum deprivation in a dose-dependent manner. However IL-1P alone failed to induce autophagy in AF cells cultured without serum starvation. When autophagy was suppressed by 3-MA the apoptosis incidence was increased. Serum supplement also partly reversed the autophagy incidence without affecting the apoptosis incidence in the same cells. Conclusions IL-1P up-regulates serum deprivation-induced autophagy of AF cells in a dose-dependent manner. Autophagy may represent a protective mechanism against .

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