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With confocal microscopy, we recorded calcium transients and analyzed calcium removal rate at different temperatures in cardiac myocytes from the rat, a non-hibernator, and the ground squirrel, a hibernator. The results showed a remarkable increase of the diastolic level of calcium transients in the rat but no detectable change in the ground squirrel. Calcium transient of the ground squirrel, compared with that of the rat at the same temperature, had a shorter duration and showed a faster calcium removal. As indicated by the pharmacological effect of cyclopiazonic acid, calcium uptake by sarcoplasmic reticulum (SR) was the major mechanism of calcium removal, and was faster in the ground squirrel than in the rat. Our results confirmed the essential role of SR in hypothermia-tolerant adaptation, and negated the importance of Na-Ca exchange. We postulated the possibility to improve hypothermia-tolerance of the cardiac tissue of non-hibernating mammals. 相似文献
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中国生理学会第五届比较生理学术会议于2004年6月28日至7月2日在美丽的中山大学珠海校区召开。来自综合大学、师范院校、医学院校和有关研究机构等19个单位的68位代表,以及中国生理学会许荣焜副理事长等领导出席了会议。 相似文献
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共聚焦显微术测定大鼠和黄鼠心肌细胞游离Ca2+浓度与温度的关系 总被引:1,自引:0,他引:1
运用共聚焦激光扫描显微成像术对比研究非冬眠动物大鼠和冬眠动物黄鼠心肌细胞胞内Ca2+浓度 ([Ca2+]i) 随温度的变化.首先标定了不同温度下Ca2+探针indo-1的解离常数,提出并证明按α定态设定标定溶液pH值的必要性.细胞荧光分析显示,大鼠心肌细胞[Ca2+]i随温度降低显著上升,低温下频繁出现自发钙波,胞内发生钙超载;相比较冬眠动物黄鼠心肌细胞[Ca2+]i在相同条件下保持稳定,避免发生钙超载.认识其中的钙稳态机制可能对有关医学问题有潜在的指导意义. 相似文献
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The temperature-dependence of infraeeliular free caleimn (Ca) was investigated in mdo-1 loaded ventricular myocytes from the ral, a non-hibernator, and from the ground squirrel, a hibernator. The dissociation constant of indo-l at different temperatures was calibrated both al pll-tat and at @-stat . and the result demonstrated that the @-stat ralibration should be prettrred . Analysis of the fluoreseent image showed a striking increase of Ca2 as well as spontaneous caleiuni waves in ral cells, indicating an overloaded cakuum. In contrast, cardiac myocytes of the ground sqnirraf were found to keep a constant (Ca2 ) without caleium overload regardless of temperature variation. It is be-lieved that understanding of the mechanisms underlying the interccllular caleima homeostasis of hibrernators may lead to solutions of some medical questions . 相似文献
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运用共聚焦激光扫描显微成像术对比研究非冬眠动物大鼠和冬眠动物黄鼠心肌细胞胞内Ca2+浓度 ( [Ca2+]i)随温度的变化 .首先标定了不同温度下Ca2+探针indo 1的解离常数 ,提出并证明按α定态设定标定溶液pH值的必要性 .细胞荧光分析显示 ,大鼠心肌细胞 [Ca2+ ]i 随温度降低显著上升 ,低温下频繁出现自发钙波 ,胞内发生钙超载 ;相比较冬眠动物黄鼠心肌细胞[Ca2+ ]i 在相同条件下保持稳定 ,避免发生钙超载 .认识其中的钙稳态机制可能对有关医学问题有潜在的指导意义 . 相似文献
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本文在简要概括本实验室和国际研究进展的基础上,归纳提出了冬眠动物心血管系统具有耐低体温、抗心律失常、耐缺氧等几大机能特点,并着重指出,冬眠动物适应于特殊生理条件所形成的心血管系统机能稳定性,及其背后的调节途径,对于医学研究有重要参考价值,因而作者倡导利用我国动物资源,从医学角度研究冬眠动物。 相似文献
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