title: Somatic LMCD1 mutations promoted cell migration and tumor metastasis in hepatocellular carcinoma.
abstract: Common genetic alteration in cancer genomes is implicated for embracing an aberrant cancer gene participated in tumor progression. In this study, we identified a somatic mutated LIM and cysteine-rich domains-1 (LMCD1) as a putative metastatic oncogene in human hepatocellular carcinoma (HCC) using integrated genomic approaches. In addition to revealing genomic amplification and gene upregulation, we identified recurrent E135K (3/48 cases) mutations in HCC tissues and K237R mutation in the PLC/PRF/5 HCC cell line. Expression of mutant LMCD1 E135K or K237R reduced the stress fiber assembly, increased cortical actin accumulation and induced lamellipodial extension. Consistently, these mutations enhanced cell migration and showed activation of the Rac1-signaling pathway. Inhibition of the LMCD1/Rac1 pathway by an LMCD1 short-hairpin RNA (shLMCD1) or the Rac1 inhibitor NSC23766 suppressed the mutation-mediated lamellipodial protrusion and cell migration. In PLC/PRF/5 cells with endogenous K237R mutation, cell migration was enhanced by estrogen-induced LMCD1 expression but reversed by shLMCD1 treatment. Moreover, overexpression of LMCD1 E135K mutation significantly promoted systemic lung metastasis in a murine tail vein injection model. Together, our results suggest that LMCD1 mutations are potential oncogenic events in HCC metastasis to promote cell migration through the Rac1-signaling pathway.
authors: Graduate Institute of Life Sciences, National Defense Medical Center, Taipei, Taiwan.
authors: C-Y
authors: CY
authors: Chang
authors: S-C
authors: SC
authors: Lin
authors: W-H
authors: WH
authors: Su
authors: C-M
authors: CM
authors: Ho
authors: Y-S
authors: YS
authors: Jou
mesh_terms: D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000235:genetics*; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000235:genetics; D056970:Co-Repressor Proteins / Q000235:genetics*; D005784:Gene Amplification; D055785:Gene Knockdown Techniques; D006801:Humans; D060588:LIM Domain Proteins / Q000235:genetics*; D008113:Liver Neoplasms / Q000235:genetics*; D008175:Lung Neoplasms / Q000556:secondary; D051379:Mice; D009362:Neoplasm Metastasis / Q000235:genetics*; D009368:Neoplasm Transplantation; D017354:Point Mutation; D011554:Pseudopodia / Q000235:genetics; D015398:Signal Transduction / Q000235:genetics; D015854:Up-Regulation; D047071:beta-Glucans; D020830:rac1 GTP-Binding Protein / Q000378:metabolism
chemical_list: D056970:Co-Repressor Proteins; D060588:LIM Domain Proteins; C406239:LMCD1 protein, human; C107953:RAC1 protein, human; D047071:beta-Glucans; C516584:micellapist; D020830:rac1 GTP-Binding Protein