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The chemopreventive role of dietary phytochemicals through gap junctional intercellular communication

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Abstract

Dietary phytochemicals offer protection from oxidative damages and lower the risks of chronic diseases, by complementary and overlapping action mechanisms. These include antioxidant activity, regulation of gene expression and cell cycle, stimulation of the immune and hormonal systems and modulation of cell–cell communication. Gap-junction intercellular communication (GJIC) plays an important role in maintaining tissue homeostasis by allowing the intercellular exchange of ions and regulatory molecules associated with cell proliferation, differentiation and apoptosis, and by contributing to intracellular signaling. This mechanism is strictly regulated and abnormal GJIC can result in several pathological conditions. GJIC is deregulated in cancer cells and reversible GJIC inhibition is strongly related to the promotion phase of carcinogenesis, likely mediated by reactive oxygen species. Whereas, the reversible inhibition of GJIC is related to the promotion phase of carcinogenicity, enhancers of GJIC are expected to prevent cancer. Several dietary plant compounds demonstrated the ability to control GJIC at the epigenetic levels and to prevent GJIC down-regulation by tumor promoting compounds, thus preventing cancers. In this Commentary, a number of reported studies on several phytochemicals in dietary and medicinal plants, which were able to affect GJIC and their structural proteins, i.e., connexins, in different in vivo and in vitro systems, were examined. The growing evidence, on the involvement of plant-derived molecules in the modulation of GJIC and in understanding of the specific action mechanisms, might offer a new perspective of the protective and/or preventive effects of dietary phytochemicals, in addition to possible chemotherapeutic use.

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Abbreviations

ATBC:

Alpha-tocopherol, beta-carotene cancer prevention trial

CARET:

Beta-carotene and retinol efficacy trial

Cx:

Connexin

GJIC:

Gap junction intercellular communication

ROS:

Reactive oxygen species

ROI:

Reactive oxygen intermediates

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Leone, A., Longo, C. & Trosko, J.E. The chemopreventive role of dietary phytochemicals through gap junctional intercellular communication. Phytochem Rev 11, 285–307 (2012). https://doi.org/10.1007/s11101-012-9235-7

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