title: Beclin 1 and bcl-2 expressions in bladder urothelial tumors and their association with clinicopathological parameters.
abstract: Beclin 1 plays a critical role in the regulation of autophagy, apoptosis, differentiation, as well as in the development and progression of cancer. The aim of this study was to examine the expression of beclin 1 and bcl-2 in bladder urothelial tumors, and to investigate the relationship between these two markers and clinicopathological parameters. Our study included 84 bladder urothelial tumors and 10 non-tumoral bladder tissues. Immunohistochemistry was performed on tissue microarray (TMA) sections and was evaluated semiquantitatively on the basis of the percentage of positively stained cells (proportion) and staining intensity. A significant association was found between the expression score of beclin 1 and pT stages of the urothelial tumors (p=0.012). Also, the level of beclin 1 expression inversely correlated with histological grade and pT stages (p=0.009, r=-0.284; p=0.001, r=-0.361, respectively). The bcl-2 expression level positively correlated with histological grade and pT stages of the urothelial tumors (p=0.026, r=0.243; p<0.0001, r=0.491, respectively). In addition, the level of beclin 1 expression tended to be inversely correlated with the bcl-2 expression level in urothelial tumors (p=0.055, r=-0.210). According to our data, down-regulation of beclin 1 expression and also bcl-2 overexpression seem to play an important role in the progression and aggressiveness of bladder urothelial tumors.
authors.affiliation: Department of Pathology, Suleyman Demirel University, School of Medicine, Isparta, Turkey. sirinbaspinar@gmail.com
authors.forename: Sirin
authors.initials: S
authors.lastname: Baspinar
authors.forename: Sema
authors.initials: S
authors.lastname: Bircan
authors.forename: Gulcan
authors.initials: G
authors.lastname: Yavuz
authors.forename: Nilgun
authors.initials: N
authors.lastname: Kapucuoglu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D051017:Apoptosis Regulatory Proteins / Q000032:analysis*; D000071186:Beclin-1; D014408:Biomarkers, Tumor / Q000032:analysis*; D016009:Chi-Square Distribution; D015536:Down-Regulation; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008565:Membrane Proteins / Q000032:analysis*; D008875:Middle Aged; D060787:Neoplasm Grading; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D011237:Predictive Value of Tests; D011379:Prognosis; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000032:analysis*; D046888:Tissue Array Analysis; D015854:Up-Regulation; D001749:Urinary Bladder Neoplasms / Q000737:chemistry* / Q000473:pathology; D019459:Urothelium / Q000737:chemistry* / Q000473:pathology
chemical_list: D051017:Apoptosis Regulatory Proteins; C491997:BECN1 protein, human; D000071186:Beclin-1; D014408:Biomarkers, Tumor; D008565:Membrane Proteins; D019253:Proto-Oncogene Proteins c-bcl-2
keywords: Bcl-2; Beclin 1; Bladder urothelial tumor