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L-ascorbic acid amplification of bladder carcinogenesis promotion by K2CO3
S Fukushima1, Y Kurata, R Hasegawa
1First Department of Pathology, Nagoya City University Medical School, Japan.
Cancer Research
|May 15, 1991
Summary
Potassium carbonate (K2CO3) dose-dependently promoted urinary bladder tumors in rats. L-ascorbic acid (AsA) amplified this effect, with increased urinary pH and potassium playing key roles.
Area of Science:
- Toxicology
- Carcinogenesis Research
- Urology
Background:
- Two-stage urinary bladder carcinogenesis involves initiation and promotion.
- Potassium carbonate (K2CO3) and L-ascorbic acid (AsA) are common dietary components with potential roles in carcinogenesis.
Purpose of the Study:
- To investigate the dose-dependent effect of K2CO3 in promoting urinary bladder tumors.
- To examine the amplifying effect of AsA on K2CO3-induced carcinogenesis.
- To elucidate the role of urinary pH and potassium in K2CO3 promotion.
Main Methods:
- Male F344 rats were initiated with N-butyl-N-(4-hydroxybutyl)nitrosamine.
- Rats received varying doses of K2CO3 with or without AsA or NaHCO3 supplementation during specific periods.
- Uracil was administered to induce a promotion phase.
Main Results:
- K2CO3 significantly increased preneoplastic lesions (papillary/nodular hyperplasia) and papillomas in a dose-dependent manner.
- AsA amplified the tumor-promoting effects of K2CO3 without having a promoting effect itself.
- K2CO3 administration led to a dose-dependent increase in urinary pH and K+ concentration.
Conclusions:
- K2CO3 acts as a promoter in two-stage urinary bladder carcinogenesis.
- Elevated urinary pH and K+ concentration are critical factors in K2CO3 promotion.
- AsA potentiates K2CO3-induced bladder tumor promotion, likely through modulation of urinary environment.