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. 1988 Jun;85(12):4181–4184. doi: 10.1073/pnas.85.12.4181

Putative metabolites derived from dietary combinations of calcium glucarate and N-(4-hydroxyphenyl)retinamide act synergistically to inhibit the induction of rat mammary tumors by 7,12-dimethylbenz[a]anthracene.

H M Abou-Issa 1, V A Duruibe 1, J P Minton 1, S Larroya 1, C Dwivedi 1, T E Webb 1
PMCID: PMC280390  PMID: 2967969

Abstract

Calcium glucarate and N-(4-hydroxyphenyl)retinamide were evaluated individually and in combination in the diet as preventative chemical agents, by using the induction of rat mammary tumors by 7,12-dimethylbenz[a]anthracene as the test system. When tested separately over 18 weeks, optimal doses of calcium glucarate (128 mmol/kg of diet) or N-(4-hydroxyphenyl)retinamide (1.5 mmol/kg of diet) administered daily inhibited tumor incidence by 50% or 57% and tumor multiplicity by 50% or 65%, respectively. Suboptimal doses of calcium glucarate (32 mmol/kg) and of N-(4-hydroxyphenyl)retinamide (0.75 mmol/kg) inhibited tumor incidence by 15% and 5% but had no inhibitory effect on tumor multiplicity. In contrast, the combination of calcium glucarate (32 mmol/kg) and N-(4-hydroxyphenyl)retinamide (0.75 mmol/kg) inhibited tumor incidence and tumor multiplicity by 50%. Similar synergism was observed with the combination of calcium glucarate (64 mmol/kg) and N-(4-hydroxyphenyl)retinamide (0.75 mmol/kg), the inhibition being 55-60%. HPLC analysis of the bile of female rats injected intraperitoneally with a single dose of the retinamide [60 mg/kg (body weight)] showed that the excretion of the retinamide and its glucuronide were markedly suppressed by pretreatment with an oral dose of calcium glucarate [4.5 mmol/kg (body weight)].

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Selected References

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