Molecular cloning and expression of the gene for a major leucine-rich protein from human hepatoblastoma cells (HepG2)

Jinzhao Hou, Fen Wang, Wallace L. McKeehan

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

The human hepatoblastoma cell line, HepG2, exhibits an array of stable properties in culture that have made it a popular cell culture model for studies on regulation of liver-specific gene expression and properties of hepatoma cells. In contrast to other hepatoma cell lines, HepG2 cells overexpress a characteristic detergent-extractable, wheat germ lectin-binding protein with apparent molecular mass of 130 kDa. Using an antibody to screen a phage expression library of HepG2 complementary DNA (cDNA), we identified and cloned a 4734 base pair cDNA which codes for a 130-kDa leucine-rich protein (lrp130) when expressed in transfected cells. The deduced sequence of lrp130 exhibits sequences weakly homologous to the consensus sequence for the ATP binding site in ATP-dependent kinases and the protein kinase C phosphorylation site of the epidermal growth factor receptor. Consistent with the higher levels of expression of lrp130 antigen, Northern hybridization analysis indicated that HepG2 cells express high levels of the major 4.8 kilobase lrp130 mRNA relative to other hepatoma cells. Although currently of unknown function, lrp130 may be of utility as a marker for liver cell lineages represented by the HepG2 cell line.

Original languageEnglish (US)
Pages (from-to)111-114
Number of pages4
JournalIn Vitro Cellular and Developmental Biology - Animal
Volume30
Issue number2
DOIs
StatePublished - Feb 1994
Externally publishedYes

Keywords

  • hepatoma
  • liver
  • tumor cells
  • tumor markers

ASJC Scopus subject areas

  • Developmental Biology
  • Cell Biology

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