Aging Cell:SIRT1下调可能为高龄孕产妇的不良妊娠结局负责

2021-10-06 haibei MedSci原创

通过实验探究,研究人员发现SIRT1是AMA和正常胎盘之间唯一不同表达的sirtuin家族蛋白。

在过去的几十年里,产妇年龄稳步增长;具体来说,从2017年到2018年,英国40多岁的妇女的生育数量上升了2%,而且这个比率自1985年以来几乎一直保持着持续上升的趋势。在北美和其他地方也观察到非常类似的趋势。这种现象主要是由于社会和文化因素以及辅助生殖技术的进步。

高龄产妇(AMA)通常被定义为产妇年龄≥35岁,累积的证据表明,AMA与各种不良妊娠结局有关,如胎儿生长受限(FGR)、胎儿宫内死亡、子痫前期(PE)、妊娠期糖尿病(GDM)和早产。

最近的一项研究报告说,AMA胚胎表现出老化生物标志物的升高,包括肿瘤抑制剂P53、细胞周期调节器P21和衰老相关的分泌表型相关标志物IL6。鉴于胎盘从胚胎的滋养层发育而来,研究人员推测AMA胎盘也可能与早衰有关。

胎盘衰老可由各种形式的细胞压力诱发,包括癌基因激活、端粒缩短、氧化压力和其他类型的压力。对AMA妇女的胎盘进行病理检查,研究人员发现胎儿血管灌注不良、绒毛成熟和脉络膜病变的频率更高。此外,老年雌性小鼠中也存在着胎盘的滋养细胞部分的大小急剧减小。SIRT1是一种依赖NAD+的去乙酰化酶,具有众所周知的抗衰老作用,但它与胎盘衰老的关系却没有被报道过。

在最近的一项研究中,研究人员从AMA和正常妊娠产妇中收集了人的足月胎盘和第一胎绒毛,并通过年轻和年老的雌雄C57小鼠杂交,建立了小鼠AMA模型。此外,研究人员也对HTR8/SVneo细胞中的SIRT1表达和活性进行了遗传或药理操作,还通过Elf5-Cre和Sirt1fl/fl小鼠交配,产生了滋养细胞特异性Sirt1基因敲除(KO)小鼠胎盘。滋养层细胞的移动性是通过转孔侵袭和伤口愈合试验来评估的。HTR8/SVneo细胞和人胎盘组织中的SIRT1结合蛋白是通过质谱法鉴定的。

SIRT1在AMA足月胎盘中下调,与胎盘衰老有关

通过实验探究,研究人员发现SIRT1是AMA和正常胎盘之间唯一不同表达的sirtuin家族蛋白。它在AMA胎盘生命周期的早期被下调,几乎不受父系年龄的影响。SIRT1的缺失会上调P53的乙酰化和P21的表达,并损害滋养细胞的侵袭和迁移。

Sirt1-KO小鼠胎盘表现出衰老标记和形态学破坏,同时胎儿体重下降。在滋养细胞中,SIRT1与vimentin相互作用,调节其乙酰化。总之,SIRT1通过调节vimentin蛋白的乙酰化,促进滋养细胞的上皮-间质转化(EMT),以增强侵袭性。由于SIRT1的丢失,AMA胎盘在胎盘期间表现出了过早衰老相关特征

因此,SIRT1可能是一个抗衰老的治疗目标,以改善AMA孕妇的胎盘发育和围产期结局。

 

原始出处:

Liling Xiong al. Advanced Maternal Age-associated SIRT1 Deficiency Compromises Trophoblast Epithelial-Mesenchymal Transition through an Increase in Vimentin Acetylation. Aging Cell (2021). 

 

 

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    2022-04-17 维他命
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    2021-10-08 xlysu
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    2021-10-08 quxin068
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    2021-10-07 老龙一点

    学习

    0

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    2021-10-06 易水河

    学习学习

    0

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拓展阅读

Aging Cell:高龄产妇更有可能出现胎盘早衰和畸形 

α-Klotho的过量表达明显改善了侵袭性,但没有改变衰老生物标志物的表达。α-Klotho缺陷的小鼠表现出胎盘畸形,并导致胎盘和胎儿重量较低。

2021 SMFM咨询系列#54:产妇发病和死亡的风险评估解读

母胎医学会(SMFM)发布了产妇发病和死亡的风险评估指南,主要针对产妇发病和死亡相关风险因素的评估提供指导。

BMJ:中国二胎政策与出生人口和出生相关健康因素变化的关联:全国性、描述性比较研究

为了测算2015年10月公布的中国普遍二孩政策与出生人口和健康相关出生特征变化的关联。我国研究人员进行了全国性、描述性的前后对比研究。

广州39岁妈妈延迟“娩出”三个胎儿

三胞胎,分三次“娩出”:一胎因宫内减胎后自行排出,二胎于26周时破水提前出生,三胎在医患共同努力下艰难保胎,尝试延迟分娩,24天后降生。

世界高龄产妇?74岁妇女首次怀孕产双胞胎

女性在过更年期后要怀孕产子的机率很低,但印度一名74岁的女子在结婚多年后,因迟迟无法怀孕,于2018年开始尝试人工授精,并顺利在今年初成功怀孕。9月5日,她以剖腹方式生下一对双胞胎,或因此成为世界最高龄产妇。报道称,这位妇女名叫曼加雅玛,来自印度的海得拉巴。曼加雅玛称,自己早已过了更年期,过去她曾与丈夫尝试怀孕却屡屡失败,直到看见邻居怀孕才激励她再度尝试,“55岁的邻居怀孕后,我才开始接受试管婴儿

BMJ:二孩政策对中国出生人口健康因素的影响

自2015年10月宣布以来,普遍的二孩政策与中国生育的上升以及与健康相关的生育特征的变化有关:多胎分娩产妇增加,特别是35岁以上产妇