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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 1991 Jun;82(6):657–664. doi: 10.1111/j.1349-7006.1991.tb01901.x

Sex Differences in o‐Phenylphenol and Sodium o‐Phenylphenate Rat Urinary Bladder Carcinogenesis: Urinary Metabolites and Electrolytes under Conditions of Aciduria and Alkalinuria

Ryohei Hasegawa 1,✉, Masamichi Fukuoka 2, Terue Takahashi 3, Atsushi Yamamoto 1, Shuji Yamaguchi 1, Masa‐Aki Shibata 1, Akira Tanaka 2, Shoji Fukushima 1,†
PMCID: PMC5918505  PMID: 1906852

Abstract

F344 male and female rats were administered 1.25%o‐phenylphenol (OPP) or 2% sodium o‐ phenylphenate (Na‐OPP) in combination with 3% NaHCO3 or 1% NI4Cl for 8 weeks and changes in the urinary bladder histopathology and the urinary components were examined. Administration of OPP with NaHCO3 resulted in marked urothelial liyperplasia in the urinary bladder of male rats, the response being less pronounced in females. OPP alone exerted no proliferative effect and NaHCO3 induced only slight hyperplasia in males. Na‐OPP alone induced mild hyperplastic lesions only in males, this being completely prevented by concomitant administration of NH4C1. The findings thus demonstrated a clear correlation between hyperplastic response and reported carcinogenic potential of these treatments. Of the urinary factors examined, increases in levels of pH and sodium ion concentration were positively associated with proliferative lesions especially in males, although the findings failed to explain the sex difference. Urinary concentrations of non‐conjugated forms of OPP metabolites were also not directly correlated with the development of hyperplasias. Thus, changes in individual urinary factors presumably affect nrothelial proliferation in combination rather than separately. The presence of OPP metabolites, including 2‐phenyl‐l,4‐benzoquinone, in the urine may be unimportant in the OPP urinary carcinogenesis even under conditions of alkalinuria and high sodium ion concentration.

Keywords: OPP, Na‐OPP, Urinary bladder carcinogenesis, Sex difference, Rat

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