Journal of Jilin University(Medicine Edition) ›› 2023, Vol. 49 ›› Issue (3): 697-705.doi: 10.13481/j.1671-587X.20230319

• Research in basic medicine • Previous Articles     Next Articles

Regulatory effect of lncRNA MALAT1 on activation of hepatic stellate cell and its mechanism

Lingyao XU,Shutang WEI,Yong DONG,Zhenglu SUN,Junbo ZHAO,Dazheng HAN()   

  1. Department of Gastroenterology,First Affiliated Hospital,Henan University,Kaifeng 475100,China
  • Received:2022-06-23 Online:2023-05-28 Published:2023-06-20
  • Contact: Dazheng HAN E-mail:13569519096@163.com

Abstract:

Objective To discuss the regulatory effect of long chain non-coding RNA (lncRNA) metastasis associated transcript 1 (MALAT1) on the activation of the hepatic stellate cells (HSC) during the progression of liver fibrosis, and to clarify its mechanism. Methods The serum samples were collected from 25 healthy volunteers (n=25,healthy group) and 25 liver fibrosis patients[ mild liver fibrosis group (n=12)and severe liver fibrosis group (n=13)]. The mouse HSC were divided into control group,transforming growth factor-β1(TGF-β1) group, TGF-β1+si-NC group, TGF-β1+si-MALAT1 group,TGF- β 1+si-MALAT1+anti-miR-150-5p group,and TGF-β1 group+si-MALAT1+CXCL14 group. Real-time fluorescence quantitative PCR (RT-qPCR) method was used to detect the expression levels of MALAT1 mRNA, microRNA-150-5p (miR-150-5p), and CXC chemokine ligand 14 (CXCL14) mRNA in serum and HSC of the subjects in various groups;Western blotting method was used to detect the expression levels of CXCL14, α-smooth muscle actin(α-SMA),and type Ⅰ collagen α 1 (COL1A1) proteins in serum of the subjects in various groups;CCK-8 method was used to detect the proliferation activities of the HSC in various groups; the expression levels of α- SMA,COL1A1 proteins in the HSC in various groups were detected by immunofluorescence;the targeting relationship between miR-150-5p and MALAT1 and CXCL14 3′-UTR genes was detected by dual luciferase reporting system. Results .The RT-qPCR results showed that compared with healthy group, the serum expression levels of MALAT1 mRNA and CXCL14 mRNA of the subjects in mild and severe liver fibrosis groups were increased(P<0.05), while the expression levels of miR-150-5p were decreased (P<0.05); compared with mild liver fibrosis group, the serum expression levels of MALAT1 mRNA and CXCL14 mRNA of the subjects in severe liver fibrosis group were increased (P<0.05),while the expression level of miR-150-5p was decreased (P<0.05); compared with control group, the expression levels of MALAT1 mRNA and CXCL14 mRNA in the HSC in TGF- β1 group were increased (P<0.05), while the expression level of miR-150-5p was decreased (P<0.05); compared with TGF-β1+si-NC group, the expression levels of MALAT1 mRNA and CXCL14 mRNA in the HSC in TGF-β1+si MALAT1 group were decreased (P<0.05), while the expression level of miR-150-5p was increased (P<0.05); compared with TGF-β1+si MALAT1 group, the expression levels of miR-150-5p in the HSC in TGF- β1+si-MALAT1 and anti-miR-150-5p groups were decreased (P<0.05), while the expression levels of CXCL14 mRNA were increased (P<0.05); compared with TGF-β1+si-MALAT1 group, the expression level of CXCL14 mRNA in the HSC in TGF-β1+si-MALAT1+CXCL14 group was increased (P<0.05).The Western blotting results showed that compared with healthy group, the serum expression levels of CXCL14 protein of the subjects in mild and severe liver fibrosis groups were increased (P<0.05); compared with mild liver fibrosis group, the serum expression level of CXCL14 protein of the subjects in severe liver fibrosis group was increased (P<0.05); compared with control group, the expression levels of α-SMA and COL1A1 proteins in the HSC in TGF-β1 group were increased (P<0.05); compared with TGF-β1+si-NC group, the expression levels of α- SMA and COL1A1 proteins in the HSC in TGF-β1+si-MALAT1 group were decreased (P<0.05); compared with TGF-β1+si-MALAT1 group, the expression levels of CXCL14,α-SMA and COL1A1 proteins of the HSC in TGF-β1+si-MALAT1+anti-miR-150-5p group and TGF-β1+siMALAT1+CXCL14 group were increased (P<0.05).The CCK-8 method results showed that compared with control group, the proliferation activity of the HSC in TGF-β1 group was increased (P<0.05); compared with TGF-β1+si-NC group, the proliferation activity of the HSC in TGF-β1+si-MALAT1 group was decreased (P<0.05); compared with TGF-β1+si-MALAT1 group,the proliferation activities of the HSC in TGF-β1+si-MALAT1+anti-miR-150-5p group and TGF-β1+si-MALAT1+CXCL14 group were increased (P<0.05). The immunofluorescence results showed that the expressions of α-SMA and COL1A1 proteins in the HSC in various groups was consistent with the results detected by Western blotting method. There was a targeting relationship between MALAT1 and CXCL14 3 '-UTR and miR-150-5p. The double luciferase reporter gene assay results showed that compared with miR-NC group, the luciferase activity of the HSC in miR-150-5p group co-transfected with MALAT1 WT or CXCL14 WT was decreased (P<0.05). Conclusion Knocking down of MALAT1 can inhibit the activation of the HSC induced by TGF- β 1,and the mechanism may be related to the miR-150-5p/CXCL14 signaling pathway.

Key words: Liver fibrosis, Hepatic stellate cell, Long non-coding RNA metastasis-associated lung adenocarcinoma transcript 1, MicroRNA-150-5p, CXC chemokine ligand 14

CLC Number: 

  • R575