PDGFRα-Signaling Is Dispensable for the Development of the Sinoatrial Node After Its Fate Commitment.

PDGFRα-Signaling Is Dispensable for the Development of the Sinoatrial Node After Its Fate Commitment.
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PDGFRα信号对于窦房结命运承诺后的发育是可有可无的

DOI:
10.3389/fcell.2021.647165
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发表时间:
2021
影响因子:
5.5
通讯作者:
Hu X
Hu X
中科院分区:
生物学2区
文献类型:
--
作者:
Zheng X;Wang F;Hu X;Li H;Guan Z;Zhang Y;Hu X

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腭源性生长因子受体α(Pdgfrα)信号通路在心脏发育中起重要作用。先前使用Pdgfrα常规敲除小鼠的研究报告了窦静脉心肌发育不全,包括窦房结(SAN),伴有Nkx 2.5表达增加。由于胚胎致死性,该小鼠系胚胎在E11.5死亡,使其难以研究细节。为了阐明潜在的机制,在本研究中,我们通过使用Shox 2-Cre;Pdgfrαflox/flox条件小鼠系,在E9.5时通过Shox 2-Cre在SAN中产生Pdgfrα的特异性消融来重新观察这一观察结果。令人惊讶的是,我们发现,所产生的纯合子突变小鼠没有表现出任何畸形的SAN形态相比,其野生型同窝出生。进一步分析显示,通过记录心率和心电图评估成年突变小鼠的正常心功能,并且Pdgfrα条件性敲除小鼠的E13.5 SAN中Nkx2.5的表达未改变。我们的研究结果明确表明,Pdgfrα在小鼠中的命运承诺后,对SAN的发展是不利的。
Palate-derived growth factor receptor α (Pdgfrα) signaling has been reported to play important roles in the cardiac development. A previous study utilizing Pdgfrα conventional knockout mice reported hypoplasia of the sinus venous myocardium including the sinoatrial node (SAN) accompanied by increased expression of Nkx2.5. This mouse line embryos die by E11.5 due to embryonic lethality, rendering them difficult to investigate the details. To elucidate the underlying mechanism, in this study, we revisited this observation by generation of specific ablation of Pdgfrα in the SAN by Shox2-Cre at E9.5, using a Shox2-Cre;Pdgfrαflox/flox conditional mouse line. Surprisingly, we found that resultant homozygous mutant mice did not exhibit any malformation in SAN morphology as compared to their wild-type littermates. Further analysis revealed the normal cardiac function in adult mutant mice assessed by the record of heart rate and electrocardiogram and unaltered expression of Nkx2.5 in the E13.5 SAN of Pdgfrα conditional knockout mice. Our results unambiguously demonstrate that Pdgfrα is dispensable for SAN development after its fate commitment in mice.
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