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Japanese Journal of Cancer Research : Gann logoLink to Japanese Journal of Cancer Research : Gann
. 1997 Dec;88(12):1121–1124. doi: 10.1111/j.1349-7006.1997.tb00338.x

Differential Dose‐dependent Effects of α‐, β‐Carotenes and Lycopene on Gap‐junctional Intercellular Communication in Rat Liver in vivo

Vladimir Krutovskikh 1,†, Makoto Asamoto 1,✉, Nobuo Takasuka 1, Michiaki Murakoshi 2, Hoyoku Nishino 3, Hiroyuki Tsuda 1
PMCID: PMC5921344  PMID: 9473727

Abstract

In order to examine the relevance of alteration of gap‐junctional intercellular communication (GJIC) to chemopreventive activity against carcinogenesis, the effects of α andβ ‐carotene as well as lycopene, typical chemopreventive carotenoids, on cell coupling via gap junctions in rat liver in vivo were studied using a direct functional dye‐transfer technique. We found that all three test compounds given at a dose of 50 mg/kg‐body weight (b.w.) daily, 5 times by gavage, inhibited GJIC, while similar treatment with 5 mg/kg b.w. caused enhancement, especially in the β‐carotene and lycopene‐treated groups. At the dose level of 0.5 mg/kg b.w., the three compounds had no effect. The findings show that all three agents differentially modulate GJIC depending on the dose, with beneficial effects on cell communication only detected at the one dose. The result suggests that determination of the dose of chemicals to be used is crucial for human intervention studies.

Keywords: Carotenoid, Gap junction, Chemoprevention

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