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Nat Commun:婴儿肠道微生物组成与非社会恐惧行为有关 

2021-06-03 haibei MedSci原创

最近,在一项针对34名婴儿的试验性研究中,研究人员发现1岁龄的肠道微生物组组成与非社会性恐惧范式中恐惧行为的增加明显相关。

恐惧,一种对威胁的行为反应,是促进生存的进化保守的机制。恐惧的出现是人类正常发育的一个重要组成部分。对不同环境刺激的恐惧行为的出现,其时间表似乎与发育相关的健康威胁平行,这支持恐惧获得的进化非关联模型。

大约在6个月大的时候,婴儿通过辨别恐惧的脸和其他面部表情表现出恐惧处理。在随后的几个月里,人们可以可靠地检测到婴儿对高度、陌生人和陌生物体的恐惧,行为反应的强度至少在11个月大时才会增加,许多引起恐惧的范式在12个月大时到达最高强度。

恐惧可能是一种调节或保护机制,以平衡这段时间内移动和探索行为的增加。这种一般的发育模式在不同的个体中都能观察到,但对特定威胁的恐惧强度可能有所不同,高水平的发育期恐惧预示着未来焦虑症的出现,而缺乏早期恐惧行为可能与未来的冷酷无情特征有关。

已有的研究显示,在动物模型中对肠道微生物的实验操作改变了恐惧行为和相关的神经环路。在人类中,生命的第一年是大脑发育,恐惧感的出现以及肠道微生物组的建立的关键时期。婴儿肠道微生物组的变化已经被发现与认知发展有关,但它与恐惧行为和神经回路的关系尚不清楚。

最近,在一项针对34名婴儿的试验性研究中,研究人员发现1岁龄的肠道微生物组组成(Weighted Unifrac;Bacteroides的丰度较低,Veillonella、Dialister和Clostridiales的丰度增加)与非社会性恐惧范式中恐惧行为的增加明显相关

婴儿微生物组与非社会性恐惧行为之间的关联性

1个月时微生物组丰富度增加而均匀度降低的婴儿也显示出非社交恐惧的增加。

这项研究表明了人类婴儿肠道微生物组与恐惧行为的关联,以及与恐惧相关的大脑结构的可能关系,其依据是一个小群组。因此,它代表了理解肠道微生物组在人类恐惧行为发展中的作用的一个重要步骤,但还需要未来用更多的参与者来进一步验证。

 

原始出处:

Alexander L. Carlson et al. Infant gut microbiome composition is associated with non-social fear behavior in a pilot study. Nature Communications (2021). 

 

 

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    2021-09-09 liye789132251
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    2021-07-04 liuli5079
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