Altered hepatic BMP signaling pathway in human HFE hemochromatosis.

Altered hepatic BMP signaling pathway in human HFE hemochromatosis.
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DOI:
10.1016/j.bcmd.2010.08.010
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发表时间:
2010-12-15
影响因子:
2.3
通讯作者:
Pietrangelo, Antonello
Pietrangelo, Antonello
中科院分区:
医学4区
文献类型:
--
作者:
Bolondi, Giuliano;Garuti, Cinzia;Corradini, Elena;Zoller, Heinz;Vogel, Wolfgang;Finkenstedt, Armin;Babitt, Jodie L.;Lin, Herbert Y.;Pietrangelo, Antonello

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人类血色病 (HC) 与 HFE 的常见 C282Y 多态性或 TfR2、HJV、FPN 和 HAMP 的罕见致病性突变有关。所有形式的人类HC似乎都是由铁调素(铁激素)水平低或不足引起的。我们和其他人最近发现 Hfe−/− 小鼠的控制铁调素的骨形态发生蛋白 (BMP) 信号通路存在缺陷。然而,所有表明 BMP 在铁调素调节中的核心作用以及 HC 中 BMP/SMAD 信号传导受损的数据均已在小鼠中收集。在这项研究中,我们研究了人类中 BMP 信号靶点 SMAD7 和 Id1 的表达是否与肝铁浓度 (LIC) 相关,以及这种调节在 HFE-HC 中是否被破坏。我们通过 RT-PCR 评估,将 HAMP、SMAD7 和 Id1 的 mRNA 表达与铁状态正常、HFE-HC 或非 HC 肝铁超载患者的肝活检中的 LIC 相关联。我们发现,在人肝脏中,不仅 HAMP,而且 SMAD7 和 Id1 mRNA 都与肝铁负荷程度显着相关。然而,这种相关性在 HFE-HC 患者中消失,但在非血色素沉着性铁超负荷受试者中保持。这些数据表明,在人类 HFE-HC 中,肝脏中 BMP/SMAD 信号传导中断是该疾病发病机制的关键。
Human hemochromatosis (HC) has been associated with the common C282Y polymorphism of HFE or rare pathogenic mutations of TfR2, HJV, FPN and HAMP. All forms of human HC seem to be caused by low or inadequate levels of hepcidin, the iron hormone. We and others have recently shown that Hfe−/−mice exhibit an impairment in the bone morphogenetic protein (BMP) signaling pathway controlling hepcidin. However, all data indicating the central role of BMPs in hepcidin regulation and an impaired BMP/SMAD signaling in HC have been collected in mice. In this study we investigated whether also in humans the expression of BMP signaling targets, SMAD7 and Id1, are associated with liver iron concentration (LIC) and whether such regulation is disrupted in HFE-HC. We correlated the mRNA expression, assessed by RT-PCR, of HAMP, SMAD7 and Id1 with LIC in liver biopsies from patients with normal iron status, HFE-HC or non-HC hepatic iron overload. We found that in human liver, not only HAMP, but also SMAD7 and Id1 mRNA significantly correlate with the extent of hepatic iron burden. However, this correlation is lost in patients with HFE-HC, but maintained in subjects with non-hemochromatotic iron overload. These data indicate that in human HFE-HC a disrupted BMP/SMAD signaling in the liver is key in the pathogenesis of the disease.
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