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J Gastroenterology: 小鼠中IP 3 R1的缺失会导致肠道假性梗阻

2019-05-05 不详 MedSci原创

肌醇1,4,5-三磷酸受体(IP3Rs)是位于内质网膜上的细胞内Ca 2+释放通道家族的一员,已有文献报道其在细胞的生理功能中起关键作用。然而,它们在体内调节胃肠(GI)道运动的功能仍然未知。因此,本项研究旨在使用基因工程小鼠模型研究了胃肠道中IP 3 R1 的生理功能。

背景
肌醇1,4,5-三磷酸受体(IP3Rs)是位于内质网膜上的细胞内Ca 2+释放通道家族的一员,已有文献报道其在细胞的生理功能中起关键作用。然而,它们在体内调节肠(GI)道运动的功能仍然未知。因此,本项研究旨在使用基因工程小鼠模型研究了肠道中IP 3 R1 的生理功能。

方法
研究人员用纯合的Itpr1 floxed(Itpr1 f / f)小鼠与Pdgfrb - Cre小鼠杂交以产生条件性IP 3 R1敲除(pcR1KO)小鼠。使用细胞谱系追踪技术用于确定胃肠道中Pdgfrb - Cre介导的基因缺失发生的位置。等长张力记录用于测量IP 3 R1缺失对肌肉收缩的影响。

结果
在小鼠胃肠道中,Pdgfrb – Cre小鼠的Itpr1基因缺失发生在平滑肌细胞,肠神经元和Cajal的间质细胞中。pcR1KO小鼠发生胃肠动力受损,整个肠道运输时间延长,并有腹胀症状。pcR1KO小鼠早在8周龄时也表现高死亡率,50%的pcR1KO小鼠在出生后40周死亡。结肠环形肌肉自发性收缩的频率显着降低,并且pcR1KO小鼠的自发收缩幅度增加。然而,在PCR1KO小鼠中,KCl诱导的收缩和平滑肌特异性收缩基因的表达没有显着改变。

结论
本项研究为临床研究人员提供了一种新的GI运动受损小鼠模型,并证明IP 3 R1在调节体内胃肠道的生理功能中发挥关键作用。

原始出处:

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    2020-03-07 许安
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