title: Y-box-binding protein-1 expression is not correlated with p53 expression but with proliferating cell nuclear antigen expression in non-small cell lung cancer.
abstract: Transcription factor Y-box-binding protein 1 (YB-1), which binds to the inverted CCAAT box, is not only involved in the transcription of various genes, but also in cell proliferation and DNA repair. The aim of this study was to detect YB-1 and p53 expression and their relationship to proliferating cell nuclear antigen (PCNA) in non-small cell lung cancer (NSCLC) using immunohistochemical (IHC) staining, and to evaluate the relationship between their expression levels and the prognosis of patients with NSCLC. Positive expressions of YB-1, p53 and PCNA were detected in NSCLC cells in 43 (45.7%), 33 (35.0%) and 45 (47.9%) out of 94 patients, respectively. No significant differences were observed between YB-1 expression and the patients' gender, age at surgery, pathological stage, pathological T status, pathological N status, or pathological M status. The mean PCNA-labelling index (LI) for cells was 40.7+/-2.6. Also, a significant correlation between YB-1 and PCNA-LI was found (p<0.01), but none was found between p53 expression and PCNA. The positive expression of YB-1 was associated with squamous cell carcinoma and large cell carcinoma, compared with adenocarcinomas (p<0.01), and higher levels of PCNA-LI were associated with large cell carcinoma compared with adenocarcinomas and squamous cell carcinoma (p<0.01). These results suggest that YB-1 expression is correlated with PCNA expression in NSCLC. In addition, the DNA repair pathway and tumor proliferation mediated by YB-1 linking to PCNA may be responsible for controlling the growth of NSCLC.
authors.affiliation: Second Department of Surgery, School of Medicine, University of Occupational and Environmental Health, Kitakyushu 807-8555, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Yoshimatsu
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Uramoto
authors.forename: Tsunehiro
authors.initials: T
authors.lastname: Oyama
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Yashima
authors.forename: Chundong
authors.initials: C
authors.lastname: Gu
authors.forename: Masaru
authors.initials: M
authors.lastname: Morita
authors.forename: Kenji
authors.initials: K
authors.lastname: Sugio
authors.forename: Kimitoshi
authors.initials: K
authors.lastname: Kohno
authors.forename: Kosei
authors.initials: K
authors.lastname: Yasumoto
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D022762:CCAAT-Enhancer-Binding Proteins / Q000096:biosynthesis* / Q000235:genetics; D002289:Carcinoma, Non-Small-Cell Lung / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008175:Lung Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D051839:NFI Transcription Factors; D011379:Prognosis; D018809:Proliferating Cell Nuclear Antigen / Q000096:biosynthesis* / Q000235:genetics; D015996:Survival Rate; D014157:Transcription Factors / Q000096:biosynthesis* / Q000235:genetics; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis* / Q000235:genetics; D051840:Y-Box-Binding Protein 1
chemical_list: D022762:CCAAT-Enhancer-Binding Proteins; D051839:NFI Transcription Factors; D018809:Proliferating Cell Nuclear Antigen; D014157:Transcription Factors; D016159:Tumor Suppressor Protein p53; D051840:Y-Box-Binding Protein 1