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Blood:NCOA4介导失血后的肝铁储备动员

2020-07-22 MedSci原创 MedSci原创

NCOA4介导失血后的肝铁储备动员;在促进HIF稳定的条件下,NCOA4表达以HIF-1α/HIF-2α依赖性方式上调。

中心点:

NCOA4介导失血后的肝铁储备动员;

在促进HIF稳定的条件下,NCOA4表达以HIF-1α/HIF-2α依赖性方式上调。

摘要:

放血促进肝铁储备动员的机制尚不明确。NCOA4(核受体共激活因子4)是一种广泛表达的细胞内蛋白,已被证明可以介导铁蛋白的自噬降解。在本研究中,Li等研究了NCOA4在调节肝脏铁储备中的局部需求以及NCOA4的调节机制。

在未放血的小鼠中,靶向敲除肝细胞的Ncoa4基因对肝脏铁蛋白亚单位水平和非血红素铁浓度的影响不大。放血后,靶向敲除肝细胞Ncoa4基因的小鼠出现贫血和低铁血症,与Ncoa4调节完整的对照小鼠相似,但降低肝脏铁蛋白亚单位水平和肝脏非血红素铁浓度的能力明显减弱。这种损伤的肝脏反应即使在限制膳食铁的情况下也能观察到。

在人和小鼠肝癌细胞系中,稳定缺氧诱导因子(HIF)的化学物质,包括去铁胺、氯化钴和二甲氧甘氨酸,都能提高NCOA4 mRNA的表达。这种NCOA4 mRNA的诱导发生在3小时内,先于NCOA4蛋白的升高,并在HIF-1a和HIF-2a双重敲除的情况下减弱。

综上所述,本研究首次展示了NCOA4在失血后促进肝脏铁动员方面的作用,以及HIF调节肝源性细胞中NCOA4的表达。鉴于调节HIF稳定性的脯氨酸羟化酶是氧和铁依赖性酶,本研究发现提出一种新的机制,即缺氧和缺铁可能通过调节NCOA4的表达来影响铁的体内平衡。

原始出处:

Xiuqi Li,et al. NCOA4 is Regulated by HIF and Mediates Mobilization of Murine Hepatic Iron Stores After Blood Loss. Blood. July 13,2020.

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    2021-01-06 circumcision
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    2021-05-26 pyaili
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    2020-07-31 ms 内分泌科张

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    2020-07-28 ms 内分泌科张

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    2020-07-24 daviiliu

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