CIRC RES:急性运用儿茶酚胺可导致可逆心肌细胞损伤

2016-09-19 MedSci MedSci原创

单次注射ISO可引起约10%的心肌细胞发生损伤。然而,大多数这些细胞可以不通过cKit阳性心脏干细胞产生新生心肌细胞的方式进行修复。这些研究结果对儿茶酚胺在临床上的使用具有重要的参考价值。

儿茶酚胺作为常见的心血管活性药物,可以增加心肌收缩力,但高浓度或长期使用可引起心肌损伤。最近Circulation Research上的一项研究表明,单次皮下注射异丙肾上腺素(ISO200 mg/kg)可引起小鼠急性心肌细胞损伤(约8%–10%的心肌细胞),但是受损的心脏可以在一个月内完全修复。 

研究采用了173C57BL/6小鼠,分组连续6天单次注射治疗对照溶剂、200300/mg/kg或每日两次注射每次剂量为200mg/kgISO。超声心动图发现在单次注射ISO一天后,可以瞬时增加心脏的收缩功能,而对心脏的舒张功能没有影响。单次ISO注射可引起心脏约10%的细胞发生膜损伤,但这些细胞很少出现细胞坏死,并可导致循环中肌钙蛋白I水平升高,结果提示心肌细胞发生了进一步的损伤。然而,单次注射ISO引起心肌细胞损伤,但并没有增加心肌细胞凋亡。即使在单次注射ISO28天后,小鼠心脏重量与体重比值和心脏纤维化水平也没有明显改变。内源性cKit阳性的心脏干细胞可以介导的新生心肌细胞形成,然而,在cKit+/Cre×R-GFP转基因小鼠上,单次注射ISO并不增加新的心肌细胞。

最后研究表明单次注射ISO可引起约10%的心肌细胞发生损伤。然而,大多数这些细胞可以不通过cKit阳性心脏干细胞产生新生心肌细胞的方式进行修复。这些研究结果对儿茶酚胺在临床上的使用具有重要的参考价值。 

原始出处: 

Markus Wallner, et al. Acute Catecholamine Exposure Causes Reversible Myocyte Injury Without Cardiac Regeneration. Circulation research. 2016. 

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    2016-09-27 童小孩

    学习了,很受益,谢谢分享,继续关注中!

    0

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    2016-09-21 hbwxf
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    2016-09-19 大旺旺

    学习了啊

    0

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