JOURNAL ARTICLE
REVIEW

Oxidative metabolism, gap junctions and the ionizing radiation-induced bystander effect

Edouard I Azzam, Sonia M de Toledo, John B Little
Oncogene 2003 October 13, 22 (45): 7050-7
14557810
Evidence accumulated over the past two decades has indicated that exposure of cell populations to ionizing radiation results in significant biological effects occurring in both the irradiated and nonirradiated cells in the population. This phenomenon, termed the 'bystander response', has been shown to occur both in vitro and in vivo and has been postulated to impact both the estimation of risks of exposure to low doses/low fluences of ionizing radiation and radiotherapy. Several mechanisms involving secreted soluble factors, oxidative metabolism and gap-junction intercellular communication have been proposed to regulate the radiation-induced bystander effect. Our current knowledge of the biochemical and molecular events involved in the latter two processes is reviewed in this article.

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