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Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.
Novel approaches with track segment alpha particles and cell co-cultures in studies of bystander effects.
There is now a significant body of data that indicate that the effects of ionising radiation may extend to more than those cells that directly suffer damage to DNA in the cell nucleus. Cells neighbouring those cells that are irradiated, or even well separated from those that are irradiated demonstrate several responses that are recorded in hit cells as a function of absorbed dose. That is, the responding non-hit cells are bystanders of hit cells. A protocol has been devised which allows for examination of one means of eliciting bystander responses, specifically, effects on non-contacting cells. Cell culture chambers are set up such that a population of cells is physically separate from the energy depositions of track segment charged particles. Absorption of energy in sub-millimetre distances in the cell culture medium ensures that one population of cells can only respond to factors generated in the irradiated medium or in another population of irradiated co-cultured cells, which may be of similar or dissimilar origin. For irradiation of medium alone, enhanced levels of micronuclei, and of delays in cell cycle progression occur in normal human fibroblasts, but not epithelial cells. This procedure allows for a defining of the factors responsible for initiating bystander effects and for determining their quantitative relevance.
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