Exposure to ionizing radiation modifies neurally-evoked electrolyte transport and some inflammatory responses in rat colon in vitro

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Abstract
Purpose: To characterize the responsiveness of the colon to neural stimulation following acute exposure of rats to gamma -radiation and to correlate observed changes to a number of parameters. Materials and methods: Rats were exposed to 5 or 10 Gy 137Cs gamma radiation or not (sham-irradiated) and studied at 1, 3 and 7 days after irradiation. Stripped segments of colon were mounted in Ussing chambers for measurements of neurally-evoked electrolyte transport (electrical field stimulation). Colonic tissue was also taken for biochemical (tissue 5-hydroxytryptamine, histamine, leukotriene B, nitric oxide synthase) and histological analyses 4 (mast cells). Results: In irradiated rats both proximal and distal colon were hyporesponsive to electrical field stimulation at 1 and 3 days, but had recovered by 7 days. In the distal colon, carbachol responses were attenuated 1 day after 10 Gy. Mast cells, tissue histamine and leukotriene B synthesis were significantly reduced 4 at all time points but no changes were seen in 5-HT or inducible NOS activity. Conclusions: Rat colon becomes hyporesponsive to neural stimuli post-irradiation. The response initially (1 and 3 days) correlates with decreased mast cells and histamine, but not at 7 days.

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