Nat Commun:过量补铁可能会引起肥胖孕妇的胚胎毒性 

2021-07-04 haibei MedSci原创

只有母体同时暴露于铁过量和炎症,而不是单独的任何一种情况,会导致胚胎畸形和死亡。

铁是所有组织在代谢和细胞过程中都需要的一种重要的微量营养素。在怀孕期间,为了支持胎儿和胎盘的生长以及母体红细胞的扩增,机体对铁的需求大幅增加。为了满足这些需求,饮食中铁的吸收和储存中铁的调动都会增加,而这是由母体血红蛋白的减少所介导的,血红蛋白是肝脏中产生的铁调节肽激素。

严重的铁缺乏和相关的贫血对母亲和胎儿都是有害的,这导致了在大多数国家,包括美国,即使没有筛查是否预先存在铁缺乏,也要普遍补充铁。在发达国家,大多数育龄妇女有足够的铁储存,不到25%的孕妇有轻度缺铁和贫血,这促使人们考虑不加区分地补充铁的潜在风险。

尽管铁对细胞功能和生存能力是必不可少的,但过量的铁可能是有毒的。在铁过量的情况下,血浆中的高铁浓度超过了转铁蛋白的铁结合能力,非转铁蛋白结合的铁(NTBI)出现在血液循环中,通过产生活性氧损害细胞和组织。目前,我们对于转铁蛋白饱和度升高和/或母体循环中存在NTBI如何影响胎盘和胎儿组织尚不清楚。

已有的研究显示,产妇铁蛋白(一种铁储存的标志物)与不良妊娠结局风险之间存在U型关系。然而,铁蛋白也是由炎症诱导的,在炎症或感染期间可能会高估铁储存。在最近的一项研究中,研究人员使用小鼠模型来确定母体铁负荷、炎症或它们的相互作用是否可以导致不良妊娠结局。

母体铁超载和系统性炎症协同导致胚胎毒性

结果显示,只有母体同时暴露于铁过量和炎症,而不是单独的任何一种情况,会导致胚胎畸形和死亡

在LPS诱导的急性炎症和肥胖诱导的慢性轻度炎症中,母体铁过量都会加重胚胎损伤。这种不利的相互作用取决于TNFα信号,导致胎盘和胚胎内皮细胞的凋亡,并被抗TNFα或抗氧化剂治疗所阻止

因此,该发现提出了关于怀孕期间不加选择地补充铁的安全性的重要问题。

 

原始出处:

Allison L. Fisher et al. Iron-dependent apoptosis causes embryotoxicity in inflamed and obese pregnancy. Nature Communications (2021). 

 

 

 

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    2021-12-31 liye789132251
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    2021-08-26 liuli5079
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    2021-07-06 ailian1202
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    2021-07-06 kksonne
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    2021-07-04 wwcq11240306

    只有母体同时暴露于铁过量和炎症,而不是单独的任何一种情况,会导致胚胎畸形和死亡。

    0

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