激光扫描共聚焦显微镜观察血小板内钙离子浓度的变化

观察血小板内钙离子浓度的变化及细胞外钙离子对其影响，为探讨血小板内Ｃａ＋＋与疾病的关系及阐明药物作用机制提供理论依据。方法用不同浓度的二磷酸腺苷（ＡＤＰ）、５－羟色胺（５－ＨＴ）、花生四烯酸、瑞斯托霉素、胶原、凝血酶诱导血小板，通过激光扫描共聚焦显微镜观察标记了Ｆｌｕｏ－３的单个血小板内钙离子变化，以及细胞外钙离子对其影响。结果（１）除凝血酶外，其余诱导剂均可引起血小板钙离子浓度变化，且随着诱导剂浓度增加，钙波动频率增加，持续时间延长；（２）ＡＤＰ引起的血小板钙波动，在细胞外无钙离子时，只是幅度减少，而无频率变化；（３）５－ＨＴ引起的钙波动，在细胞外无钙时，波动消失。结论（１）ＡＤＰ、５－ＨＴ、花生四烯酸、瑞斯托霉素、胶原可引起血小板产生钙浓度变化。（２）不同诱导剂诱发的钙波动，其钙离子来源不同。

Platelet calcium oscillation by laser scanning confocal microscopy

Objective To observe platelet calcium oscillation and the influence of extracellular Ca 2 on it. Methods We observed a single platelet intracellular Ca change and the influence of extracellular Ca 2 on it by laser sanning confocal microscopy when various agonists of different concentrations stimulated platelets. Results The other agonists except thrombin induced platelet calcium oscillation. With increasing agonis concentrations, the frequence of calcium oscillation enhanced and calcium oscillation sustained longer. In the absence of Ca , the amplitude of ADP induced calcium oscillation was smaller without frequence variations, and 5 TH induced calcium oscillation was inhibited. Conclusions Platelet calcium oscillation increased from fluctuation either in the entry of external calcium or the release from internal stores.