Smooth muscle cell-specific Tgfbr1 deficiency promotes aortic aneurysm formation by stimulating multiple signaling events.

Smooth muscle cell-specific Tgfbr1 deficiency promotes aortic aneurysm formation by stimulating multiple signaling events.
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DOI:
10.1038/srep35444
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发表时间:
2016-10-14
期刊:
影响因子:
4.6
通讯作者:
Jiang Z
Jiang Z
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yang P;Schmit BM;Fu C;DeSart K;Oh SP;Berceli SA;Jiang Z

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转化生长因子(TGF)-β信号转导障碍已成为主动脉瘤发展的常见分子标志。出生后成熟的时间在决定主动脉壁中TGF-β信号转导障碍的生物学结果中起关键作用。在这项研究中,我们研究了TGFβ受体缺乏对成熟的睾丸组织结构稳态的影响。我们使用了一个诱导型Cre-loxP系统驱动的Myh 11启动子删除Tgfbr 1,Tgfbr 2,或两者在平滑肌细胞(SMC)的成年小鼠。TGFBR 1缺乏导致快速和严重的主动脉瘤变性,升主动脉瘤100%复发,而TGFBR 2缺失仅导致轻度主动脉病变,病变发生率低(26%)。TGFBR 2的去除减弱了TGFBR 1缺失引起的主动脉病变,并与早期ERK磷酸化的减少相关。此外,血管紧张素(Ang)转换酶的生产上调TGFBR 1缺陷的血管紧张素在早期阶段的血管变性。抑制ERK磷酸化或阻断AngII I型受体AT 1 R可防止TGFBR 1缺陷型大鼠睾丸的囊性变性。总之,SMC-Tgfbr 1的缺失触发了多种有害途径,包括异常的TGFBR 2、ERK和AngII/AT 1 R信号,这些信号破坏主动脉壁稳态,导致主动脉瘤形成。
Transforming growth factor (TGF)-β signaling disorder has emerged as a common molecular signature for aortic aneurysm development. The timing of postnatal maturation plays a key role in dictating the biological outcome of TGF-β signaling disorders in the aortic wall. In this study, we investigated the impact of deficiency of TGFβ receptors on the structural homeostasis of mature aortas. We used an inducible Cre-loxP system driven by a Myh11 promoter to delete Tgfbr1, Tgfbr2, or both in smooth muscle cells (SMCs) of adult mice. TGFBR1 deficiency resulted in rapid and severe aneurysmal degeneration, with 100% penetrance of ascending thoracic aortas, whereas TGFBR2 deletion only caused mild aortic pathology with low (26%) lesion prevalence. Removal of TGFBR2 attenuated the aortic pathology caused by TGFBR1 deletion and correlated with a reduction of early ERK phosphorylation. In addition, the production of angiotensin (Ang)-converting enzyme was upregulated in TGFBR1 deficient aortas at the early stage of aneurysmal degeneration. Inhibition of ERK phosphorylation or blockade of AngII type I receptor AT1R prevented aneurysmal degeneration of TGFBR1 deficient aortas. In conclusion, loss of SMC-Tgfbr1 triggers multiple deleterious pathways, including abnormal TGFBR2, ERK, and AngII/AT1R signals that disrupt aortic wall homeostasis to cause aortic aneurysm formation.
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