Immunohistochemical study of cell proliferation, Bcl-2, p53, and caspase-3 expression on preneoplastic changes induced by cadmium and zinc chloride in the ventral rat prostate.
This work was directed to evaluate immunoexpression of markers for apoptosis, resistance to apoptosis, and cell proliferation, as well as estimates of nuclear size in ventral prostate of rats treated with cadmium chloride and cadmium+zinc chloride because a possible protective effect of zinc has been postulated. The following variables were studied: volume fraction (VF) of Bcl-2 immunostaining, percentage of cells immunoreactive to proliferating cell nuclear antigen (LIPCNA) and p53 (LIp53), numerical density of caspase-3 immunoreactive cells (NV caspase-3), and estimates of volume-weighted mean nuclear volume (upsilonV). The LIPCNA and VF of Bcl-2 were significantly increased in the treated animals. The dysplasias (independent of their origin) showed a significant increase of the LIp53, NV caspase-3, and upsilonV in comparison with normal acini from treated and control animals. It can be concluded that cell proliferation is enhanced in long-term cadmium-exposed rats, and exposure to zinc combined with cadmium had no effect on any of the variables studied when comparing with normal acini. The increase of nuclear upsilonV could indicate a more aggressive behavior for pretumoral lesions.
Cell Biology and Histology Laboratory, San Pablo-CEU University, Madrid, and Service of Pathology, Hospital N. Sra. de Sonsoles, Avila, Spain.
Riánsares
R
Arriazu
José M
JM
Pozuelo
Nuno
N
Henriques-Gil
Teresa
T
Perucho
Rocío
R
Martín
Rosario
R
Rodríguez
Luis
L
Santamaría
D000818:Animals; D017209:Apoptosis; D019256:Cadmium Chloride / Q000633:toxicity*; D002273:Carcinogens / Q000633:toxicity*; D053148:Caspase 3; D020169:Caspases / Q000096:biosynthesis*; D049109:Cell Proliferation; D002712:Chlorides / Q000494:pharmacology*; D007150:Immunohistochemistry; D008297:Male; D011230:Precancerous Conditions / Q000139:chemically induced / Q000378:metabolism / Q000473:pathology*; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D011467:Prostate / Q000378:metabolism / Q000473:pathology*; D019048:Prostatic Intraepithelial Neoplasia / Q000139:chemically induced / Q000378:metabolism / Q000473:pathology*; D011471:Prostatic Neoplasms / Q000378:metabolism / Q000473:pathology*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000096:biosynthesis*; D051381:Rats; D017207:Rats, Sprague-Dawley; D013997:Time Factors; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis*; D017967:Zinc Compounds / Q000494:pharmacology*
D002273:Carcinogens; D002712:Chlorides; D018809:Proliferating Cell Nuclear Antigen; D019253:Proto-Oncogene Proteins c-bcl-2; D016159:Tumor Suppressor Protein p53; D017967:Zinc Compounds; C016837:zinc chloride; C505410:Casp3 protein, rat; D053148:Caspase 3; D020169:Caspases; D019256:Cadmium Chloride