• 哈爾濱醫(yī)科大學(xué)第二附屬醫(yī)院普通外科(黑龍江哈爾濱 150086);

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(xì)胞系SMMC7721凋亡的影響,并初步探討其機(jī)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(xì)胞自噬進(jìn)行定性觀察;以CCK8法檢測3-MA抑制細(xì)胞自噬前后經(jīng)5-FU誘導(dǎo)SMMC7721細(xì)胞的存活,凋亡以AnnexinⅤ/PI流式細(xì)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(dá)。
結(jié)果  5-FU處理肝癌SMMC7721細(xì)胞48h后,可誘導(dǎo)其發(fā)生自噬,細(xì)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(xì)胞存活率明顯降低(P<0.01),為(42.31±1.32)%,而細(xì)胞凋亡率顯著增加(P<0.01),為(60.92±2.99)%,同時(shí)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(dá)增加,其灰度值比較差異均有統(tǒng)計(jì)學(xué)意義(均P<0.01)。
結(jié)論  自噬在5-FU誘導(dǎo)肝癌細(xì)胞系SMMC7721凋亡過程中起保護(hù)性作用,抑制自噬可提高肝癌SMMC7721細(xì)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(shí)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(jī)制研究△. 中國普外基礎(chǔ)與臨床雜志, 2013, 20(8): 872-877. doi: 復(fù)制

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  1. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 15. Mizushima N. Methods for monitoring autophagy[J]. Int J Biochem Cell Biol, 2004, 36(12):2491-2502.
  16. 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. 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. 18. Kumar S. Caspase function in programmed cell death[J]. Cell Death Differ, 2007, 14(1):32-43.
  19. 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. 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.