孙成文,安刚,钟国赣,等.低剂量X射线全身照射对小鼠T淋巴细胞钙激活钾通道的影响[J].中华放射医学与防护杂志,1996,16(3):154-156.Sun Chengwen,An Gang,Zhong Guogan,et al.Effect of low dose X-rays on Ca2+-activated K+ channels in mouse thymic lymphocytes[J].Chin J Radiol Med Prot,1996,16(3):154-156 |
低剂量X射线全身照射对小鼠T淋巴细胞钙激活钾通道的影响 |
Effect of low dose X-rays on Ca2+-activated K+ channels in mouse thymic lymphocytes |
投稿时间:1995-03-21 修订日期:1995-07-14 |
DOI: |
中文关键词: 膜片钳 钙依赖性钾通道 低剂量辐射 免疫增强 T淋巴细胞 |
英文关键词:Patch clamp Ca2+-activated K+ channel low dose radiation thymic lymphocytes immunoenhancement |
基金项目:国家自然科学基金 |
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中文摘要: |
本文作者应用连细胞膜片钳技术, 观察了低剂量X射线全身照射对小鼠T淋巴细胞钙激活钾通道[K(Ca)]的影响。发现低剂量照射使ConA(20μg/ml)引起的K(Ca)通道开放增强, 表现为开放时间延长、开放概率增加, 而对单通道电流幅值无明显影响。在淋巴细胞浸浴液中加入ConA后3分钟, 照射组动物淋巴细胞K(Ca)通道开放概率明显高于对照组。而且照射后4~24小时, K(Ca)通道的激活随时间推移而逐步增强。所以K(Ca)通道在低剂量放射增强免疫的机制中可能具有重要的意义。 |
英文摘要: |
The effect of low dose X-rays on Ca2+-activated K+ channels[K(ca)] in mouse thymic lymphocytes was observed using the cell-attached configuration of patch clamp technique.It is shown that low dose X-rays can elevate the open times and openstate probabilities of K(ca) channels, without apparent influence on the current flowing through the channels.After 3 min exposure of lymphocytes to Con A the open-state probabilitis of K(ca) channels in irradiated group were higher than those in control group.It was observed that from 4 to 24h after irradiation the activity of K(ca) chanels increased with time. K(ca)channels are important in the molecular mechanism of immutnoenhancement following low dose irradiation. |
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