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@#Objective: To study the effects of vitamin C (VC) on reversing cisplatin (DDP) resistance in oral squamous cell carcinoma (OSCC) and the mechanism. Methods: Human OSCC CAL27 cells were cultured in vitro and DDP-resistant CAL27 cell line (CAL27/ DDP) was screened by increasing concentration gradient method. Plate clone formation assay, CCK-8, Wound healing assay, Annexin V-FITC/PI staining flow cytometry were used to determine the effects of DDP alone or in combination with VC on colony formation, proliferation, migration and apoptosis of CAL27/DDP cells. Western blotting was used to detect the expression level of P-gp protein in CAL27 cells, CAL27/DDP cells and VC treated CAL27/DDP cells. Results: The inhibition concentration (IC50) of DDP increased significantly in CAL27/DDP cells as compared with that in CAL27 cells (P<0.05), indicating CAL27/DDP was DDP-resistant.After the combination with VC, the IC50 of DDP on CAL27/DDP cells was significantly reduced compared with that of DDP alone (P<0.05). DDP combined with VC significantly inhibited the migration of CAL27/DDP cells (P<0.01), and promoted the apoptosis rate (P<0.01). The expression level of P-gp protein in CAL27/DDP cells was increased compared with that in CAL27 cells (P<0.05), but decreased after VC intervention (P<0.05). Conclusion: VC can reverse DDP-resistance in OSCC cells by inhibiting P-gp protein expression.
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@#程序性细胞死亡是多细胞生物死亡的重要生物学过程，其调控方式复杂，对维持细胞内环境稳定十分重要。在过去 的几年中，除了凋亡之外，对程序性细胞死亡的非凋亡形式的研究也取得了进展。p53作为经典的肿瘤抑制因子，除了控制细胞 增殖和凋亡外，也参与非典型细胞死亡调控。p53通过对其下游靶点的转录调控以及与关键蛋白的直接作用，直接或间接调节细 胞的非典型死亡。本文对p53在凋亡、铁中毒、细胞程序性坏死、自噬性细胞死亡、有丝分裂灾难、副凋亡等几种非典型细胞死亡 模式中的作用作一综述，为肿瘤抑制机制的阐明及癌症药物研制提供相应参考。