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Inhibition of intercellular communication by condensates of high and low tar cigarettes

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Abstract

Inhibition of gap junctional intercellular communication (GJIC) is a predictive short term test for tumor promoting activity. A new metabolic cooperation assay has been developed, which takes the cytochrome P-450 metabolism into account. In this assay the inhibitory activity of tobacco smoke condensates (CSC) and CSC fractions from high and low tar cigarettes was tested. CSC of both high and low tar cigarettes and fractions thereof contained tumor promoting activity. The tar yield of the cigarettes did not closely reflect the effects in the GJIC assay and the major constituent nicotine had no effect. The effect was only marginally greater in cells expressing different cytochrome P-450 enzymes, indicating that the active substances are not metabolized by these enzymes. The activities of CSC fractions were considerably lower than the activities in the unfractionated CSC. This may indicate that compounds in the CSC act strongly synergistically. Furthermore, CSC and CSC fractions synergistically inhibit GJIC with the tumor promoter 12-O-tetradecanoylphorbol-13-acetate, indicating different mechanisms of action.

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Supported by a fellowship of Danish Research Academy and Occupational Health Foundation. A Medical Research Council statistical adviser helped in the preparation of the statistical analysis

Supported by Danish Cancer Society

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Vang, O., Wallin, H. & Autrup, H. Inhibition of intercellular communication by condensates of high and low tar cigarettes. Arch Toxicol 69, 415–420 (1995). https://doi.org/10.1007/s002040050193

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  • DOI: https://doi.org/10.1007/s002040050193

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