Expression of Y box-binding protein-1 correlates with DNA topoisomerase IIalpha and proliferating cell nuclear antigen expression in lung cancer

Anticancer Res. Jul-Aug 2001;21(4A):2357-62.


Y box-binding protein-1 (YB-1), a member of the DNA binding protein family, interacts with inverted CCAAT boxes (Y-boxes). Y-boxes are located on the promoter of numerous genes, such as DNA topoisomerase IIalpha (Topo IIalpha), proliferating cell nuclear antigen (PCNA) and multidrug resistance 1 (MDR1). In this study, we used immunohistochemical (IHC) staining to detect YB-1 expression in 59 lung cancer tissues and to evaluate whether YB-1 expression was associated with the expression of YB-1 target genes such as Topo IIalpha, PCNA and MDR1 in human lung carcinoma. Twenty-eight out of 59 cases (47.5%) were stained positive for YB-1 in the cytoplasm, while 30 out of 59 cases (50.8%) were positive for PCNA in the nuclei. Topo IIalpha-positive cells were detected in 16 out of 59 cases (27.1%). Eight out of 59 cases (13.6%) had greater than 5% P-gp positive cells expression. There was a significant correlation between the YB-1 and Topo IIalpha expression in small cell lung cancer (SCLC) (p=0.0242). YB-1 expression also correlated with PCNA expression in non-small cell lung cancer (NSCLC) (p=0.0001). Higher levels of YB-1 expression were associated with T3-4 and Stage III-IV tumors in adenocarcinomas (p=0.0072; p=0.0168). In contrast, no relationship was found between YB-1 expression and P-gp expression. Our study suggests that YB-1 expression correlates with Topo IIalpha and PCNA expression in lung cancer.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • ATP Binding Cassette Transporter, Subfamily B, Member 1 / biosynthesis
  • ATP Binding Cassette Transporter, Subfamily B, Member 1 / genetics
  • Adenocarcinoma / enzymology
  • Adenocarcinoma / genetics
  • Adenocarcinoma / metabolism
  • Adenocarcinoma / pathology
  • Aged
  • Antigens, Neoplasm
  • CCAAT-Enhancer-Binding Proteins / biosynthesis*
  • CCAAT-Enhancer-Binding Proteins / genetics
  • Carcinoma, Small Cell / enzymology
  • Carcinoma, Small Cell / genetics
  • Carcinoma, Small Cell / metabolism
  • Carcinoma, Small Cell / pathology
  • Carcinoma, Squamous Cell / enzymology
  • Carcinoma, Squamous Cell / metabolism
  • DNA Topoisomerases, Type II / biosynthesis*
  • DNA Topoisomerases, Type II / genetics
  • DNA-Binding Proteins*
  • Female
  • Gene Expression Regulation, Neoplastic
  • Humans
  • Immunohistochemistry
  • Lung Neoplasms / enzymology
  • Lung Neoplasms / genetics
  • Lung Neoplasms / metabolism*
  • Lung Neoplasms / pathology
  • Male
  • NFI Transcription Factors
  • Nuclear Proteins
  • Proliferating Cell Nuclear Antigen / biosynthesis*
  • Proliferating Cell Nuclear Antigen / genetics
  • Transcription Factors*
  • Tumor Cells, Cultured
  • Y-Box-Binding Protein 1


  • ATP Binding Cassette Transporter, Subfamily B, Member 1
  • Antigens, Neoplasm
  • CCAAT-Enhancer-Binding Proteins
  • DNA-Binding Proteins
  • NFI Transcription Factors
  • Nuclear Proteins
  • Proliferating Cell Nuclear Antigen
  • Transcription Factors
  • Y-Box-Binding Protein 1
  • YBX1 protein, human
  • DNA Topoisomerases, Type II