Volume 60, Issue 6, Pages (June 2014)

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Volume 60, Issue 6, Pages 1225-1234 (June 2014) Monoamine oxidase A suppresses hepatocellular carcinoma metastasis by inhibiting the adrenergic system and its transactivation of EGFR signaling  Jun Li, Xiao-Mei Yang, Ya-Hui Wang, Ming-Xuan Feng, Xiao-Jin Liu, Yan-Li Zhang, Shuo Huang, Zheng Wu, Feng Xue, Wen-Xin Qin, Jian-Ren Gu, Qiang Xia, Zhi-Gang Zhang  Journal of Hepatology  Volume 60, Issue 6, Pages 1225-1234 (June 2014) DOI: 10.1016/j.jhep.2014.02.025 Copyright © 2014 European Association for the Study of the Liver Terms and Conditions

Fig. 1 MAOA is down-regulated and is closely related to patient prognosis in hepatocellular carcinoma (HCC). (A) The immunohistochemical staining of MAOA in HCC and corresponding noncancerous liver (CNL) tissues. Scale bars, 10μm. (B) The expression of MAOA was down-regulated in 70.5% of HCC patients. (C) Kaplan-Meier analysis of OS for the expression of MAOA. p=0.002. (D) Kaplan-Meier analysis of DFS for the expression of MAOA. p=0.010. (E) The immunohistochemical staining of MAOA in HCC, CNL, normal liver and thrombus tissues. Scale bars, 10μm. (F) Western blotting analysis of MAOA expression in HCC, CNL, normal liver and thrombus tissues. GAPDH was used as a loading control. Journal of Hepatology 2014 60, 1225-1234DOI: (10.1016/j.jhep.2014.02.025) Copyright © 2014 European Association for the Study of the Liver Terms and Conditions

Fig. 2 MAOA overexpression abrogates the effects of epinephrine (E) or norepinephrine (NE) on HCC cell invasion and anoikis inhibition in vitro and metastasis in vivo. (A and B, upper) Representative quantification of cell invasiveness analysis of SMMC-7721 (A) and MHCC-97L (B) cells infected with Lenti-MAOA and Lenti-vector, stimulated by E or NE. (A and B, lower) Flow cytometry statistical analysis of anoikis of SMMC-7721 (A) and MHCC-97L (B) cells infected with Lenti-MAOA and Lenti-vector, stimulated by E or NE. (C) Representative images of H&E staining in liver tissues from mice orthotopically inoculated with MAOA overexpressed SMMC-7721 and control cells. Statistical analysis of intrahepatic metastatic focis (200×) in the two groups is shown right. (D) Pulmonary metastases were detected by H&E staining. Statistical analysis of numbers of pulmonary metastatic nodules (200×) is shown right. (E) H&E staining of intrahepatic tumors and metastases in mice orthotopically inoculated with SK-Hep1 cells and intraperitoneally injected with clorgyline or vehicle. Statistical analysis of intrahepatic metastatic focis (200×) in the two groups is shown right. Arrows: intrahepatic or pulmonary metastases. Scale bars, 10μm ∗p<0.05, ∗∗p<0.01. Journal of Hepatology 2014 60, 1225-1234DOI: (10.1016/j.jhep.2014.02.025) Copyright © 2014 European Association for the Study of the Liver Terms and Conditions

Fig. 3 The expression of MAOA is inversely correlated with NE/E content in HCC tissues, and NE-induced HCC cell invasion and anoikis inhibition were mediated by different adrenoceptors. (A) Analysis of correlation between the mRNA level of MAOA and the content of NE in 19 cases of human HCC tissues. Pearson’s correlation was used. (B) Analysis of correlation between the mRNA level of MAOA and the content of E. (C) Statistical analysis of NE and E content in 35 cases of HCC tissues ∗∗p<0.01. (D) The expression of MAOA protein in the culture supernatant of control or MAOA overexpressed SMMC-7721 or MHCC-97L cells. GAPDH of remaining cells was used as a loading control. (E and F) SMMC-7721 (E) or MHCC-97L cells (F), pre-treated with prazosin or ICI118551, were analyzed for cell invasiveness or anoikis upon 100nM NE stimulation. (G and H) NE-induced invasion and anoikis inhibition of SMMC-7721 (G) and MHCC-97L (H) were significantly reduced by ADRA1A or ADRB2 knockdown n.s., not significant ∗p<0.05, ∗∗p<0.01. Journal of Hepatology 2014 60, 1225-1234DOI: (10.1016/j.jhep.2014.02.025) Copyright © 2014 European Association for the Study of the Liver Terms and Conditions

Fig. 4 MAOA inhibits ADRA1A/ADRB2-mediated transactivation of EGFR signaling, and enhances the inhibitory effects of EGFR inhibitors or ADRs antagonists on NE-induced HCC cell invasion and anoikis inhibition. (A) Western blotting analysis of phosphorylation of EGFR in four different HCC cells treated with NE for 5min. (B) Phosphorylation of EGFR, Erk1/2 in MAOA overexpressed and control SMMC-7721 cells treated with NE for 0, 5, 10, and 15min. GAPDH was detected as the loading control. (C) Phosphorylation of EGFR or PKA in SMMC-7721 cells treated with prazosin, ICI118551, AG1478, erlotinib and/or NE. (D) PCR analysis of MMP7, ADAM12/HB-EGF, TGF-α, and amphiregulin for Lenti-vector/SMMC-7721 treated with vehicle, Lenti-vector/SMMC-7721 treated with NE and Lenti-MAOA/SMMC-7721 treated with NE. (E and F) Phosphorylation of EGFR induced by NE was obviously suppressed by blocking MMP7 or ADAM12 with siRNA (E) or MMP inhibitor III (MMP7 inhibitor) and GM6001 (MMP7/ADAM12 inhibitor) (F). (G) Phosphorylation of EGFR induced by NE was obviously suppressed by blocking HB-EGF with anti-HB-EGF neutralyzing antibody and heparin. (H and I) EGFR inhibitors or ADRs antagonists abrogated NE-induced HCC cell invasion and anoikis inhibition of SMMC-7721 (H) and MHCC-97L cells (I) with MAOA overexpression ∗p<0.05, ∗∗p<0.01. (J) Model for NE/E-derived and ADRs-mediated signalings underlying HCC cell invasiveness and anoikis. Upon stimulation by NE/E, ADRA1A/ADRB2 activates MMP7/ADAM12, release HB-EGF to transactivate EGFR and downstream Erk1/2 signaling, thereby promote cell invasiveness and anti-anoikis. ADRA1A/ADRB2-mediated transactivation of EGFR signaling can be blocked by EGFR inhibitors, ADRs antagonists or MAOA overexpression. Combined use of them obtains a better inhibitory effect on ADRs-mediated transactivation of EGFR. Additionally, canonical PKA and CREB signaling also participate in this mechanism. Journal of Hepatology 2014 60, 1225-1234DOI: (10.1016/j.jhep.2014.02.025) Copyright © 2014 European Association for the Study of the Liver Terms and Conditions

Fig. 4 MAOA inhibits ADRA1A/ADRB2-mediated transactivation of EGFR signaling, and enhances the inhibitory effects of EGFR inhibitors or ADRs antagonists on NE-induced HCC cell invasion and anoikis inhibition. (A) Western blotting analysis of phosphorylation of EGFR in four different HCC cells treated with NE for 5min. (B) Phosphorylation of EGFR, Erk1/2 in MAOA overexpressed and control SMMC-7721 cells treated with NE for 0, 5, 10, and 15min. GAPDH was detected as the loading control. (C) Phosphorylation of EGFR or PKA in SMMC-7721 cells treated with prazosin, ICI118551, AG1478, erlotinib and/or NE. (D) PCR analysis of MMP7, ADAM12/HB-EGF, TGF-α, and amphiregulin for Lenti-vector/SMMC-7721 treated with vehicle, Lenti-vector/SMMC-7721 treated with NE and Lenti-MAOA/SMMC-7721 treated with NE. (E and F) Phosphorylation of EGFR induced by NE was obviously suppressed by blocking MMP7 or ADAM12 with siRNA (E) or MMP inhibitor III (MMP7 inhibitor) and GM6001 (MMP7/ADAM12 inhibitor) (F). (G) Phosphorylation of EGFR induced by NE was obviously suppressed by blocking HB-EGF with anti-HB-EGF neutralyzing antibody and heparin. (H and I) EGFR inhibitors or ADRs antagonists abrogated NE-induced HCC cell invasion and anoikis inhibition of SMMC-7721 (H) and MHCC-97L cells (I) with MAOA overexpression ∗p<0.05, ∗∗p<0.01. (J) Model for NE/E-derived and ADRs-mediated signalings underlying HCC cell invasiveness and anoikis. Upon stimulation by NE/E, ADRA1A/ADRB2 activates MMP7/ADAM12, release HB-EGF to transactivate EGFR and downstream Erk1/2 signaling, thereby promote cell invasiveness and anti-anoikis. ADRA1A/ADRB2-mediated transactivation of EGFR signaling can be blocked by EGFR inhibitors, ADRs antagonists or MAOA overexpression. Combined use of them obtains a better inhibitory effect on ADRs-mediated transactivation of EGFR. Additionally, canonical PKA and CREB signaling also participate in this mechanism. Journal of Hepatology 2014 60, 1225-1234DOI: (10.1016/j.jhep.2014.02.025) Copyright © 2014 European Association for the Study of the Liver Terms and Conditions