通过CRISPR-Cas9基编辑消除CaMKIIδ自,改善小鼠心力衰竭的存活率和心脏功能
Simon Lebek1,2,3, Xurde M Caravia1,2, Francesco Chemello1,2
1Department of Molecular Biology (S.L., X.M.C., F.C., W.T., J.R.M., N.L., R.B.-D., E.N.O.), University of Texas Southwestern Medical Center, Dallas.
Circulation
|September 15, 2023
概括
在小鼠心力衰竭模型中,基因编辑以阻止CaMKIIδ过度激活显著改善了心脏功能和存活率. 这种方法有望通过向心脏功能障碍中的关键酶来治疗人类的心脏疾病.
科学领域:
- 心血管生物学
- 分子心脏病学
- 基因编辑技术
背景情况:
- 心血管疾病是全球死亡的主要原因, 需要新的治疗策略.
- 心脏酶Ca2+/ 卡尔莫杜林依赖蛋白激酶IIδ (CaMKIIδ) 的过度活化是各种心脏疾病的关键因素.
研究的目的:
- 通过向CaMKIIδ的自化部位来开发心力衰竭的基因编辑疗法.
- 在心力衰竭的小鼠模型和人类细胞中评估CRISPR- Cas9基编辑的有效性和安全性.
主要方法:
- 在小鼠中使用CRISPR-Cas9基编辑创建抗CaMKIIδ突变.
- 进行横向大动脉收缩以诱导心力衰竭;评估心脏功能,基因表达,细胞亡和纤维化.
- 人类诱导多能干细胞被编辑为针对同类的CaMKIIδ位点,通过深度安普利康测序来评估特异性.
主要成果:
- 与野生型小鼠相比,基因编辑小鼠的死亡率显著降低 (11% vs. 65%),心力衰竭诱导后心脏功能得到改善.
- 经过CaMKIIδ编辑的小鼠得到了预防心力衰竭引起的基因表达变化,细胞亡和纤维化.
- 经过编辑的人类细胞和心肌细胞显示出对压力下的Ca2+失调和心律失常的保护,对CaMKIIδ的编辑特异性很高.
结论:
- 通过腺基编辑去除CaMKIIδ自化为人类心脏病提供了潜在的治疗策略.
- 对CaMKIIδ的基因编辑工具的高特异性是潜在的临床转换的关键安全特征.
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