In an attempt to better understand the effect of whole body X-irradiation on the spontaneous motility of the isolated mouse duodenum and to clarify the possible radioprotective notion of reduced glutathione (GSH), a whole body X-irradiation of 1,000r was given to albino mouse either singularly or immediately after injecting GSH intraperitoneally to mouse in the dose of 1mg per gm of body weight. The total length of contraction of the isolated duodenum was recorded on kymograph every five minutes for 60 minutes, and the comparison was made with the control (i.e., normal). The results thus obtained are summarized as follows: 1. The spontaneous motility of the isolated duodenum in the X¡¤irradiated groups showed a significantly elevated pattern for the first 15 minutes comparing with the control. The motility, however, decreased after 15 minutes and remained so in the X-irradiated groups to the level of the non-irradiated control, but 12 hours post-irradiation group showed a significantly increased motility throughout the experiment comparing with the control. 2. When GSH was injected intraperitoneally Prior to the whole body X¡¤irradiation with 1,000r, the spontaneous motility of the isolated duodenum of mouse showed a significantly decreased pattern for the first 10 and 15 minutes comparing with the X¡¤irradiated group followed by the similar motility thereafter comparing with the control and X-irradiated groups. 3. The above results suggest that GSH is effective as a radioprotector in terms of the motility of the isolated mouse duodenum.
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