不同剂量重组人IL－6对照射小鼠外周血细胞恢复的影响

Effect of different doses of rhIL-6 on peripheral blood recovery in irradiated mice

目的：观察了不同剂量ｒｈＩＬ－６对６．５Ｇｙ照射Ｃ５７ＢＬ／６Ｊ小鼠外周血细胞恢复的影响。方法：ＩＬ－６的剂量分别为１０，２００，５００和１０００μｇ·Ｋｇｔ－１·ｄ－１，连续给药４天，首次于照后３０分钟给入，皮下注射，每日两次。照后５，１１，１４，１８，２２和３０天测定外周血白细胞、血小板和红细胞数量等变化。结果表明：ＩＬ－６的４种剂量治疗组外周血细胞数降至最低值时间与对照组相同即：ＷＢＣ为５天，ＰＬＴ为１１天，ＲＢＣ为１４天。然而，在ＩＬ－６剂量大于或等于２００μｇ·Ｋｇ－１·ｄ－１时，各组外周血ＷＢＣ、ＰＬＴ和ＲＢＣ的最低值不同程度地高于对照组，其后的恢复程度也比对照组高。ＩＬ－６治疗组外周血三类血细胞最低值及一定时期的恢复程度与ＩＬ－６剂量之间有良好的相关关系。结论：通过本研究，ｒｈＩＬ－６将是治疗辐射引起的血小板生成减少的候选因子之一。

The effects of recombinant human interleukin-6 (rhIL-6) on the recovery of peripheral blood picture in 6.5Gyγ-ray irradiated( 132-127. 7R/min) C57BL/6J mice at the age of 80-90 days were studied. Group 1 served as the control and groups 2-5 were injected subcutaneously with rhIL-6 twice daily at doses of 10, 200, 500 and 1000μg -1 kg-1d-1, respectively, starting from 30 min after irradiation for 4 consecutive days. Peripheral WBC, RBC, and PLT counts, hemoglobin and hematocrit were determined before and 5, 11, 14, 18, 22 and 30 days after irradiation. It was shown that although the time of nadir emergence and the onset of recovery were similar in all the five groups, the nadir values were higher and the recovery was better, both being dose-dependent, in the IL-6 treated groups than in the control.Significant dose-response regression equations were obtained for WBC count on day 22, for RBC count on days 14 and 18, for PLT count on days 11 and 18. Our studies show that IL-6 is a candidate of thrombopoietic factor for treatment of radiation-induced thrombocytopenia.