[Expression of protein p53 in workers occupationally exposed to benzidine and bladder cancer patients.].
OBJECTIVE
To study expression of mutant p53 protein in workers occupationally exposed to benzidine and bladder cancer patients.


METHODS
Mutant p53 protein in serum from the workers occupationally exposed to benzidine and bladder cancer patients were determined with Immuno-PCR, while exfoliated urothelial cells in the urine samples were classified with Papanicolau grading.


RESULTS
Positive rate of mutant p53 protein increased with the exposed intensity index in workers occupationally exposed to benzidine. The positive rate of mutant p53 protein in bladder cancer patients (83.3%) was significantly higher than that in the group 1 of exposed intensity index. The average scanning integrals of PCR amplified band in the group of bladder cancer patients and group 2 of exposed intensity index were both higher than that in the group 1 significantly. Workers in the groups of different exposed intensity indices were further stratified according to Papanicolau grades. In the group 2 of exposed intensity index, the average scanning integrals of PCR amplified band in the stratum of Papanicolau grade II and III were significantly higher than that in the strata of Papanicolau grade I. And in the group 3 of exposed intensity index, the positive rate of mutant p53 protein in the strata of Papanicolau grade III was higher than that in the strata of Papanicolau grade I significantly.


CONCLUSIONS
The increase of exposed intensity may not only result in the positive rate of mutant p53 protein, but also the quantity of mutant p53 protein in serum within the low range of benzidine exposure. Once the exposed intensity was beyond that spectrum, the positive rate of mutant p53 protein in serum and the average scanning integrals of PCR amplified band were no longer enhanced with the increase of exposed intensity. There was tight correlation between Papanicolau grade of exfoliated urothelial cells and the positive rate or the quantity of mutant p53 protein for the higher benzidine exposure intensity.
Shen
Chun-lin
CL
Public Health School, Fudan University, Shanghai 200032, China. cqxiang@scdc.sh.cn
Xiang
Cui-qin
CQ
Zhang
Yun-ying
YY
Qin
Yi-qiu
YQ
Liu
Cha-qin
CQ
Chen
Ji-gang
JG
Zhang
Sheng-nian
SN
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001560:Benzidines / Q000633:toxicity*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D016273:Occupational Exposure; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*; D001749:Urinary Bladder Neoplasms / Q000378:metabolism*; D019459:Urothelium / Q000378:metabolism*
D001560:Benzidines; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53