水通道蛋白在卵巢上皮性癌中的表达及对细胞顺铂敏感性的影响
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摘要
水通道蛋白(Aquaporins AQPs)是水分子跨越细胞的快速转运通道,广泛分布于机体组织细胞,主要介导细胞内外的水分子运输,对维持细胞内水平衡具有重要作用。研究表明,多种恶性肿瘤存在水通道蛋白的异常表达,水通道蛋白在肿瘤的增殖、浸润转移中具有重要作用。为探讨水通道蛋白在卵巢癌中的表达与功能,本文选择以下两部分进行研究。
     第一部分水通道蛋白亚型在卵巢上皮性肿瘤组织中的表达
     已发现在卵巢癌组织表达的水通道亚型包括:AQP1、AQP3、AQP5,为明确其他水通道蛋白亚型在卵巢上皮性肿瘤的分布表达,本研究利用免疫组化技术分析AQP2、AQP4、AQP6、AQP7、AQP8、AQP9在卵巢上皮性肿瘤的分布情况,发现AQP6、AQP8、AQP9表达于卵巢上皮性肿瘤细胞,AQP2、AQP7、AQP7表达不明显。Western blot分析表明,其中AQP6在卵巢浆液性癌中表达下降;AQP9在粘液性肿瘤表达增高,AQP8在卵巢肿瘤中表达无显著差异,提示水通道蛋白在卵巢上皮性肿瘤中表达存在不同的分布与功能。
     第二部分:水通道蛋白对卵巢癌细胞顺铂敏感性的影响
     水通道蛋白作为水的跨膜膜转运体其与他转运体密切相关,细胞水通透性及细胞水代谢可能影响肿瘤细胞对化疗药物的敏感性。本文利用RT-PCR检测DDP作用下卵巢癌细胞SKOV3的水通道蛋白亚型表达变化,MTT分析水通道阻滞和细胞外渗透压改变对顺铂(DDP)细胞增殖抑制作用的影响,通过体外实验研究水通道蛋白对卵巢癌细胞DDP敏感性中的作用。结果表明,水通道蛋白阻滞和细胞外高渗增加顺铂对癌细胞的增殖抑制作用;顺铂作用后卵巢癌细胞水通道白亚型表现为不同的反应性改变,随药物作用时间的延长,AQP1表达下调与AQP3、AQP8表达增加,提示细胞水通透性影响顺铂的药物敏感性,卵巢癌细胞水通道蛋白与化疗药物敏感性及耐药密切相关。
     以上研究表明,不同的水通道蛋白亚型卵巢肿瘤的发生、发展过程中可能具有不同的作用,水通道蛋白相关的细胞水代谢与卵巢癌的化疗敏感性密切相关。对水通道蛋白表达与卵巢癌关系的研究,将为卵巢癌发病机制研究提供新的方向,对化疗药物敏感性的研究将为卵巢癌化学治疗及肿瘤耐药治疗提供新的切入点。
Aquaporins(AQPs) are specialized channels to quickly transport water across cell plasma membranes, which are distributed in mammal tissue extensively. AQPs is essential for cell to maintain water balance. Studies have shown that AQPs are strongly expressed in neoplasm of different origins, and they may play important roles in cell proliferation and migration of agressisve tumor. The present study aims at investigating the role of aquaporins in the epithelia ovarian carcinoma. The study was divided into two parts:1. expression of AQPs in epithelia ovarian tumor; 2. effect of AQPs on chemosensitivity to cisplatin in ovarian cancer.
     Part one Expression of aquaporins in epithelia ovarian tumor
     Previous study showed that some AQPs became upgrated in ovarian carcinoma, including AQP1, AQP3 and AQP5. To discovery the other subtype of aquaporin in epithelia ovarian tumor, immunohistochemical technique and western botting were used to detect the protein expression of AQP2, AQP4, AQP6, AQP7, AQP8 and AQP9. Immunohistochemical study show AQP6, AQP8 and AQP9 were expressed in ovarian tumor, but AQP2, AQP4 and AQP7 were not. The protein expression of AQP6 in serous ovarian cancer significantly decreased than that of benign tumor and normal tissue, and AQP9 expression significantly increased in mucinous tumors. There were no difference of AQP8 expression between malignant and benign tumors. These data indicated that there are different distribution and function of aquaporins in ovarian tumor.
     Part two Effects of aquaporins on chemosensitivity to cisplatin in ovarian cancer cells
     As a water transporter, aquaporins are closely related to other membrane transporters, and water permeability metabolism in cell may contribute to chemosensitivity of tumor. In this study, effects of cisplatin on aquaporins mRNA expression ovarian cancer cell SKOV3 were measured by RT-PCR. To understand the role of aquaporins on cell proliferation of SKOV3, chemosensitivity to cisplatin was observed in hypertoncity and aquaporin inhibition. MTT analyses showed that aquqporin blocker and hypertonicity increased the sensitivity of SKOV3 to cisplatin. The effects of cisplatin on SKOV3 are different between different subtype of aquaporin, following incubation time increasing, the expression of AQP1 mRNA decreased significantly, but expression of AQP3 and AQP8 increased. This results show that aquaporins may play an important role in chemosensivity of ovarian cancer.
     In conclusion, our studies have shown that different subtypes of aquaporins may play different roles in ovarian tumors, and aquaporins are associated with chemotherapy sensitivity of ovarian cancer. The research of aquaporins in ovarian cancer will provide a new direction for the pathogenesis of ovarian cancer and drug sensitivity studies for chemotherapy.
引文
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