Expression of transforming growth factor beta in renal cell carcinoma and matched non-involved renal tissue.
TGFbeta1 is one of several cytokines produced by proximal tubular and renal cancer cells. Previous studies have been mainly focused on determining plasma or serum TGFbeta levels, its effect on RCC cultures, and the expression of TGFbeta mRNA. Cancerous and autologous normal kidney samples were obtained from 24 patients treated by radical nephrectomy. TGFbeta1 expression was determined using a semi quantitative Western blot analysis and immunohistochemistry. Blot densities and immunohistochemical expression intensities in normal and neoplastic tissue were compared, and subsequently correlated to tumor stage, histological type and nuclear grade. All tissue samples examined expressed TGFbeta1; mean tumor to non-involved kidney spot density ratio correlated with advancing stage and higher nuclear grade. The overexpression of TGFbeta1 in certain RCCs may partially explain their resistance to the growth suppression action of TGFbeta. The correlation with tumor stage and grade indicates a possible role in the development of metastatic potential as well as in host's immune response modulation.
Mitropoulos
Dionisios
D
Department of Urology, University of Athens Medical School, 75 Mikras Asias St., 115-27 Athens, Greece. dmp@otenet.gr
Kiroudi
Aspasia
A
Christelli
Evangelia
E
Serafetinidis
Efraim
E
Zervas
Anastasios
A
Anastasiou
Ioannis
I
Dimopoulos
Constantinos
C
D000328:Adult; D000368:Aged; D015153:Blotting, Western; D002292:Carcinoma, Renal Cell / Q000378:metabolism*; D004847:Epithelial Cells / Q000378:metabolism; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D007668:Kidney / Q000166:cytology; D007680:Kidney Neoplasms / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011233:Precipitin Tests; D012333:RNA, Messenger / Q000378:metabolism; D016212:Transforming Growth Factor beta / Q000097:blood / Q000235:genetics* / Q000378:metabolism*
D012333:RNA, Messenger; D016212:Transforming Growth Factor beta