目的 研究自噬特異性抑制劑3-甲基腺嘌呤(3-MA)對5-氟尿嘧啶(5-FU)誘導(dǎo)肝癌細胞系SMMC7721凋亡的影響,并初步探討其機制。
方法 利用單丹(磺)酰戊二胺(MDC)染色技術(shù),在熒光顯微鏡下對細胞自噬進行定性觀察;以CCK8法檢測3-MA抑制細胞自噬前后經(jīng)5-FU誘導(dǎo)SMMC7721細胞的存活,凋亡以AnnexinⅤ/PI流式細胞分析法檢測;以Western blot法分別檢測自噬特異性蛋白LC3及凋亡蛋白caspase-3活化片段和PARP裂解片段的表達。
結(jié)果 5-FU處理肝癌SMMC7721細胞48h后,可誘導(dǎo)其發(fā)生自噬,細胞存活率為(60.73±2.65)%,凋亡率為(40.42±2.34)%;聯(lián)合應(yīng)用3-MA處理48h后,可使肝癌SMMC7721細胞存活率明顯降低(P<0.01),為(42.31±1.32)%,而細胞凋亡率顯著增加(P<0.01),為(60.92±2.99)%,同時引起自噬特異性蛋白LC3-Ⅱ及凋亡蛋白caspase-3活化片段和PARP裂解片段表達增加,其灰度值比較差異均有統(tǒng)計學意義(均P<0.01)。
結(jié)論 自噬在5-FU誘導(dǎo)肝癌細胞系SMMC7721凋亡過程中起保護性作用,抑制自噬可提高肝癌SMMC7721細胞對5-FU的敏感性,其可能主要通過激活caspase-3及剪切PARP來實現(xiàn)的。因此,自噬特異性抑制劑3-MA可能為提高肝癌對5-FU的敏感性提供新思路。
引用本文: 代景友,楊樹萌,張新晨,吳德全,楊維良. 抑制自噬對5-氟尿嘧啶治療肝癌療效的影響及機制研究△. 中國普外基礎(chǔ)與臨床雜志, 2013, 20(8): 872-877. doi: 復(fù)制
版權(quán)信息: ?四川大學華西醫(yī)院華西期刊社《中國普外基礎(chǔ)與臨床雜志》版權(quán)所有,未經(jīng)授權(quán)不得轉(zhuǎn)載、改編
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- 1. Nishikawa T, Tsuno NH, Okaji Y, et al. Inhibition of autophagy potentiates sulforaphane-induced apoptosis in human colon cancer cells[J]. Ann Surg Oncol, 2010, 17(2):592-602.
- 2. Li J, Hou N, Faried A, et al. Inhibition of autophagy augments 5-fluorouracil chemotherapy in human colon cancer in vitro and in vivo model[J]. Eur J Cancer, 2010, 46(10):1900-1909.
- 3. Kanematsu S, Uehara N, Miki H, et al. Autophagy inhibition enhances sulforaphane-induced apoptosis in human breast cancer cells[J]. Anticancer Res, 2010, 30(9):3381-3390.
- 4. Liu D, Yang Y, Liu Q, et al. Inhibition of autophagy by 3-MA potentiates cisplatin-induced apoptosis in esophageal squamous cell carcinoma cells[J]. Med Oncol, 2011, 28(1):105-111.
- 5. Shimizu S, Takehara T, Hikita H, et al. Inhibition of autophagy potentiates the antitumor effect of the multikinase inhibitor sorafenib in hepatocellular carcinoma[J]. Int J Cancer, 2012, 131(3):548-557.
- 6. Hsieh MJ, Yang SF, Hsieh YS, et al. Autophagy inhibition enhances apoptosis induced by dioscin in huh7 cells[J]. Evid Based Complement Alternat Med, 2012, 2012:134512.
- 7. Clark HP, Carson WF, Kavanagh PV, et al. Staging and current treatment of hepatocellular carcinoma[J]. Radiographics, 2005, 25 Suppl 1:S3-S23.
- 8. Chen S, Rehman SK, Zhang W, et al. Autophagy is a therapeutictarget in anticancer drug resistance[J]. Biochim Biophys Acta, 2010, 1806(2):220-229.
- 9. Hu YL, Jahangiri A, Delay M, et al. Tumor cell autophagy as an adaptive response mediating resistance to treatments such as antiangiogenic therapy[J]. Cancer Res, 2012, 72(17):4294-4299.
- 10. Lin JF, Tsai TF, Liao PC, et al. Benzyl isothiocyanate induces protective autophagy in human prostate cancer cells via inhibition of mTOR signaling[J]. Carcinogenesis, 2013, 34(2):406-414.
- 11. Tu YJ, Fan X, Yang X, et al. Evodiamine activates autophagy as a cytoprotective response in murine Lewis lung carcinoma cells[J]. Oncol Rep, 2013, 29(2):481-490.
- 12. Bareford MD, Hamed HA, Tang Y, et al. Sorafenib enhances pemetrexed cytotoxicity through an autophagy-dependent mechanism in cancer cells[J]. Autophagy, 2011, 7(10):1261-1262.
- 13. Chiu HW, Chen YA, Ho SY, et al. Arsenic trioxide enhances the radiation sensitivity of androgen-dependent and -independent humanprostate cancer cells[J]. PLoS One, 2012, 7(2):e31579.
- 14. Singh BN, Kumar D, Shankar S, et al. Rottlerin induces autop-hagy which leads to apoptotic cell death through inhibition of PI3K/Akt/mTOR pathway in human pancreatic cancer stem cells[J]. Biochem Pharmacol, 2012, 84(9):1154-1163.
- 15. Mizushima N. Methods for monitoring autophagy[J]. Int J Biochem Cell Biol, 2004, 36(12):2491-2502.
- 16. Kabeya Y, Mizushima N, Ueno T, et al. LC3, a mammalian homologue of yeast Apg8p, is localized in autophagosome membranes after processing[J]. EMBO J, 2000, 19(21):5720-5728.
- 17. Klionsky DJ, Abeliovich H, Agostinis P, et al. Guidelines for the use and interpretation of assays for monitoring autophagy in higher eukaryotes[J]. Autophagy, 2008, 4(2):151-175.
- 18. Kumar S. Caspase function in programmed cell death[J]. Cell Death Differ, 2007, 14(1):32-43.
- 19. Murcia JM, Niedergang C, Trucco C, et al. Requirement of poly (ADP-ribose) polymerase in recovery from DNA damage in mice and in cells[J]. Proc Natl Acad Sci USA, 1997, 94(14):7303-7307.
- 20. Javle M, Curtin NJ. The role of PARP in DNA repair and its thera-peutic exploitation[J]. Br J Cancer, 2011, 105(8):1114-1122.