Objective: To establish an interventional model of knockdown Kelch-like ECH-associated protein 1 (Keap1) in hepatocytes and investigate the influence of hypoxic hepatocytes with Keap1 knock-down on the matrix metalloproteinase-2 (MMP-2), and the corresponding regulatory molecules such as matrix metalloproteinase inhibitor (TIMP-2), membrane-type 1 matrix metalloproteinase (MT1-MMP or MMP14), caveolin-1 (Cav-1) of the hepatic satellite cells(HSCs). Methods: According to the method established by our group, the hepatocytes with Keap1 knock-down was constructed, and were cultured under hypoxic conditions. The expression levels of Keap1 and nuclear factor erythroid 2 related factor 2 (Nrf2), tumor necrosis factor-α (TNF-α) its downstream molecules of the hepatocytes were measured by Western blotting and QPCR. Hepatic stellate cells(HSC-T6) were cultured in the above-mentioned hepatocyte culture supernatant, then HSC-T6 cells and culture supernatant were collected. Expression of Keap1, Nrf2 and MMP-2 of the HSC-T6 cells were detected by Western blotting, the activity of MMP-2 in supernatant of HSC-T6 cells was measured by gelatin zymography. Results: After stable knock-down of Keap1,the expression of Nrf2 was increased and the expression of TNF-α was decreased in the hepatocytes. Compared with the control group,the culture supernatant of hepatocytes with Keap1 knock-down reduced the expression of MMP-2, Cav-1, MT1-MMP, TIMP-2 protein and increased the activity of MMP-2 in HSC-T6 cells. Conclusion: When hepatocytes with Keap1 knock-down are under hypoxic conditions, the degree of hepatocyte injury is reduced, and the synthesis and release of TNF-α are decreased,which may reduce the stimulation of Cav-1 in endocytic molecules of HSC-T6 cells. Cav-1 interferes with MMP-2 activation on the membrane surface, in this condition the MMP-2 activity is increased. |
[1] CAMPANA L,IREDALE J P.Regression of liver fibrosis[J].Semin Liver Dis,2017,37(1):1-10.
[2] BI J,ZHANG J,REN Y,et al.Irisin alleviates liver ischemia-reperfusion injury by inhibiting excessive mitochondrial fission,promoting mitochondrial biogenesis and decreasing oxidative stress[J].Redox Biol,2018,20:296-306.
[3] ALEGRE F,PELEGRIN P,FELDSTEIN A E.Inflammasomes in liver fibrosis[J].Semin Liver Dis,2017,37(2):119-127.
[4] ZHANG C Y,YUAN W G,HE P,et al.Liver fibrosis and hepatic stellate cells:Etiology,pathological hallmarks and therapeutic targets[J].World J Gastroenterol,2016,22(48):10512-10522.
[5] KURZEPA J,MADRO A,CZECHOWSKA G,et al.Role of MMP-2 and MMP-9 and their natural inhibitors in liver fibrosis,chronic pancreatitis and non-specific inflammatory bowel diseases[J].Hepatobiliary Pancreat Dis Int,2014,13(6):570-579.
[6] LIU J,LI Y,LIU L,et al.Double knockdown of PHD1 and Keap1 attenuated hypoxia-induced injuries in hepatocytes[J].Front Physiol,2017,8:291.与keap1shNC、对照组比较,a P < 0.05;b P < 0.01;c P < 0.001 A.蛋白质印迹法测定MMP-2及其活性调节相关蛋白表达量;B.MMP-2及其活性调节相关蛋白表达量的灰度分析图5肝细胞Keap1表达下调后常氧及缺氧培养下HSC-T6细胞的MMP-2及其活性调节相关蛋白的表达图6不同条件培养基对HSC-T6培养液中MMP-2活性的影响与缺氧培养组比较,c P < 0.001 A.蛋白质印迹法测定TNF-α蛋白表达量;B.TNF-α蛋白表达量的灰度分析图7 TNF-α抑制剂处理后肝细胞培养上清液对HSC-T6TNF-α表达影响
[7] KRAJKA-KUZNIAK V,PALUSZCZAK J,BAER-DUBOWSKA W.The Nrf2-ARE signaling pathway:An update on its regulation and possible role in cancer prevention and treatment[J].Pharmacol Rep,2017,69(3):393-402.
[8] MILLS E L,RYAN D G,PRAG H A,et al.Itaconate is an anti-inflammatory metabolite that activates Nrf2 via alkylation of KEAP1[J].Nature,2018,556(7699):113-117.
[9] CAMPOS A,SALOMON C,BUSTOS R,et al.Caveolin-1-containing extracellular vesicles transport adhesion proteins and promote malignancy in breast cancer cell lines[J].Nanomedicine (Lond),2018,13(20):2597-2609.
[10] WANG J,BAI Y,ZHAO X,et al.oxLDL-mediated cellular senescence is associated with increased NADPH oxidase p47phox recruitment to caveolae[J].Bioscience Rep,2018,38(3):R20180283.
[11] QU X,TANG Y,HUA S.Immunological approaches towards cancer and inflammation:A cross talk[J].Front Immunol,2018,9:563.
[12] YIN K,SMITH A G.Nuclear receptor function in skin health and disease:therapeutic opportunities in the orphan and adopted receptor classes[J].Cell Mol Life Sci,2016,73(20):3789-3800.
[13] LUO M,SHANG L,BROOKS M D,et al.Targeting breast cancer stem cell state equilibrium through modulation of redox signaling[J].Cell Metab,2018,28(1):69-86.
[14] ISHTIAQ S M,KHAN J A,ARSHAD M I.Psychosocial-stress,liver regeneration and weight gain:a conspicuous pathophysiological triad[J].Cell Physiol Biochem,2018,46(1):1-8. |