Add time:07/21/2019         Source:sciencedirect.com

Purpose: The combined effects of immunomodulators (lithium or OK432) and an adrenochrome derivative (AMM), an agent found to activate granulocyte-macrophage colony stimulating activity, on the survival of irradiated ddY mice is described.Methods and Materials: ddY mice at 4–5 weeks old were whole body irradiated with X rays at 8.5 Gy. Sole injection and combined injection of AMM and/or one of the immunomodulators were performed before or after irradiation. Then, survival was monitored daily for 30 days after irradiation.Results: Lithium at 60 mg/kg had no radioprotective effect; rather it accelerated radiation induced death. Sole treatment with AMM (100 mg/kg) had no effect on survival of irradiated mice. However, combination of both drugs caused a slight radioprotection. OK432 (25 KE/kg), which activates a variety of cellular effector cells had radioprotective effect. When combined with AMM, however, it totally lost radioprotective effect.Conclusion: Lithium chloride cannot be used as a radioprotector because of its adverse effect. Combination with AMM showed slight radioprotection, but the extent thereof may not be clinically useful. OK432 was proved to be a potent radioprotector. However, combination with AMM should be avoided, since the radioprotection was totally eliminated.

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