Stepwise metastatic human hepatocellular carcinoma cell model system with multiple metastatic potentials established through consecutive in vivo selection and studies on metastatic characteristics

J Cancer Res Clin Oncol. 2004 Aug;130(8):460-8. doi: 10.1007/s00432-004-0564-9. Epub 2004 May 14.

Abstract

Purpose: To establish a "stepwise metastatic human hepatocellular carcinoma (HCC) cell model system" for in-depth study of the underlying mechanisms of HCC metastasis.

Methods: Using MHCC97- a metastatic human hepatocellular carcinoma (HCC) cell line reported in 1999-as the parent cells, we subsequently established three cell lines (MHCC97-L, HMCC97-H, and HCCLM3) with increasing spontaneous metastatic potential. Now, the fourth cell line with unique multiple metastatic characteristics has been established by six rounds of in vivo selection.

Results: This cell line, designated as HCCLM6, is a polygonal epithelial cell with hypotriploid karyotype, the modal chromosomes are 55-58, and marker chromosomal abnormalities include i(1) (q10), i(8)(q10), der (4) t(4;8)(q31;q22), i(X)(q10). The cell population doubling time was 32 h. Fluorescent PCR showed HBV DNA integration in the cellular genome. Thirty-five days after HCCLM6 was injected subcutaneously into BALB/c nude mice, prominent lung metastases occurred in 100% of the recipient animals. When tumor tissue was orthotopically implanted into the liver of nude mouse, widespread loco-regional and pulmonary metastases occurred. Inoculation of this cell into the footpad of nude mice also produced 75% regional lymph node metastasis. Compared with MHCC97-L which was not metastastatic via subcutaneous or footpad inoculation and 40% metastatic via orthotopic inoculation, HCCLM6 had increased expression of matrix metalloproteinase (MMP-2 and MMP-9) and cytokeratin 19 (CK19), and decreased expression of Rb2/p130. The establishment of this new cell line has completed our stepwise metastatic HCC cell mode system, which was characterized by a similar genetic background but with significant differences in spontaneous metastasis behavior.

Conclusions: The study supports the theory that cancer metastasis is a highly selective dynamic process and the cell model system could be a useful platform for the study of HCC metastasis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Blotting, Western
  • Carcinoma, Hepatocellular* / chemistry
  • Carcinoma, Hepatocellular* / genetics
  • Carcinoma, Hepatocellular* / pathology
  • Carcinoma, Hepatocellular* / virology
  • Cell Line, Tumor*
  • Chromosome Aberrations
  • DNA, Viral
  • Gene Expression Regulation, Neoplastic
  • Hepatitis B virus / genetics
  • Humans
  • Karyotyping
  • Keratins / analysis
  • Liver Neoplasms* / chemistry
  • Liver Neoplasms* / genetics
  • Liver Neoplasms* / pathology
  • Liver Neoplasms* / virology
  • Matrix Metalloproteinase 2 / analysis
  • Matrix Metalloproteinase 9 / analysis
  • Mice
  • Mice, Inbred BALB C
  • Mice, Nude
  • Proteins / analysis
  • Retinoblastoma-Like Protein p130
  • Reverse Transcriptase Polymerase Chain Reaction

Substances

  • DNA, Viral
  • Proteins
  • Rbl2 protein, mouse
  • Retinoblastoma-Like Protein p130
  • Keratins
  • Matrix Metalloproteinase 2
  • Matrix Metalloproteinase 9