Thymosin β4 inhibits PDGF-BB induced activation, proliferation, and migration of human hepatic stellate cells via its actin-binding domain.

Thymosin β4 inhibits PDGF-BB induced activation, proliferation, and migration of human hepatic stellate cells via its actin-binding domain.
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DOI:
10.1080/14712598.2018.1478961
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发表时间:
2018-07
影响因子:
4.6
通讯作者:
Rojkind M
Rojkind M
中科院分区:
医学3区
文献类型:
--
作者:
Shah R;Reyes-Gordillo K;Rojkind M

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肝星状细胞(HSC)转分化是肝纤维化发展的核心,其标志是促纤维化基因的表达以及活化的HSC的增殖和迁移。因此,预防和/或逆转HSC的活化、增殖和迁移可能导致用于治疗纤维化/肝硬化的新疗法。胸腺素β4(Thymosin β4,Tβ4)通过阻断Akt磷酸化抑制PDGF-BB诱导的HSC纤维化、增殖和迁移。本研究利用Tβ4衍生肽:氨基末端-Ac-SDKPDMAEIEKFDKS(1- 15 aa)和肌动蛋白结合-LKKTETQ(17- 23 aa),探讨Tβ4抗纤维化作用的分子机制。我们在用PDGF-BB和/或Tβ4肽处理的人HSC培养物的早期传代中使用RT-PCR、Western印迹以及增殖和迁移测定。我们发现,17- 23 aa而不是1- 15 aa抑制PDGF-BB依赖的PDGFβ受体、α-SMA和胶原1的上调。抑制Akt在T308和S473位点的磷酸化,从而抑制PRAS 40的磷酸化,抑制HSC的增殖和迁移。有趣的是,1- 15 aa通过抑制mTOR磷酸化而阻断了S473处的Akt磷酸化,但不阻断T308处的Akt磷酸化,因此,其对HSC增殖和迁移没有任何影响。这些结果表明,虽然1- 15 aa对Akt磷酸化的影响较小,但Tβ4的抗纤维化作用是通过17- 23 aa发挥的。
Hepatic stellate cells (HSC) trans-differentiation is central to the development of liver fibrosis, marked by the expression of pro-fibrogenic genes and the proliferation and migration of activated HSC. Therefore, preventing and/or reverting the activation, proliferation, and migration of HSC may lead to new therapies for treating fibrosis/cirrhosis. Thymosin β4 (Tβ4) inhibits PDGF-BB-induced fibrogenesis, proliferation and migration of HSC by blocking Akt phosphorylation. Here, we utilized Tβ4-derived peptides: amino-terminal-Ac-SDKPDMAEIEKFDKS (1–15aa) and actin-binding-LKKTETQ (17–23aa) to investigate the molecular mechanisms in the anti-fibrogenic actions of Tβ4. We used RT-PCR, Western blot, and proliferation and migration assays in early passages of human HSC cultures treated with PDGF-BB and/or Tβ4 peptides. We showed that 17–23aa but not 1–15aa inhibited PDGF-BB-dependent up-regulation of PDGFβ receptor, α-SMA, and collagen 1. It also blunted the phosphorylation of Akt at T 308 and S473, resulting in the inhibition of phosphorylation of PRAS40, and HSC proliferation and migration. Interestingly, 1–15aa blocked Akt phosphorylation at S473, but not T308 by inhibiting mTOR phosphorylation, thus, it did not have any effect on HSC proliferation and migration. These findings suggest that while 1–15aa has a minor effect on Akt phosphorylation, the anti-fibrogenic actions of Tβ4 are exerted via 17–23aa.
成人肝脏中胸腺素β4的表达模式。
DOI: 10.4081/ejh.2011.e25
发表时间: 2011
期刊: European journal of histochemistry : EJH
影响因子: --
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