Acta Haematologica: 新生儿脐带血的正常值和独特的形态学特征

2021-11-21 MedSci原创 MedSci原创

本研究描述了新生儿CB的正常值和独特的形态学特征。CB中丰富的形态异常淋巴细胞可能代表出生时免疫系统的不成熟状态。

脐带血(CB)一直是研究和各种临床应用的宝贵造血干细胞来源,也可用于诊断新生儿的各种疾病和状况。CB 细胞成分的一些参数可以由自动分析仪提供,而其他参数,如未成熟或异常细胞,需要血膜形态评估。以往的研究表明,CB中的白细胞群可能与正常外周血(PB)不同,不仅存在未成熟细胞,而且还存在其他类型的细胞。例如,自然杀伤(NK)细胞在PB和CB中分别占淋巴细胞的10%和30%。国外进行一研究,目的是建立正常的 CB 形态,并确定 CB 中形态异常白细胞的患病率。

对取自健康母亲所生的健康足月和适当胎龄新生儿、早产新生儿、糖尿病母亲的新生儿和小于胎龄新生儿的 100 个 CB 样本进行了全面的形态学分析。采集时间为1年,100例CB样本分别来自54名男性和46名女性新生儿。评估血细胞计数,并由实验室专家进行人工形态学分析。100个CB样本中有12个来自患有以下疾病的母亲所生的新生儿:甲状腺功能减退症,产后,妊娠期间巨细胞病毒感染,母亲治疗选择性5 -羟色胺再摄取抑制剂,分娩期间抗生素治疗,所有病例都很少(少于5例),其中3例无法进一步分析。因此将这12个样本排除在进一步分析之外。

图1:脐带血(CB)样本的血液学评估

图2: 淋巴细胞亚型的形态学评估

图3:脐带血样本按新生儿状态分类。88份脐带血样本根据不同的新生儿状态进行分组(A-F)分析,见表(右)。左:每组中样品出生体重、胎龄和APGAR5的平均标准差

结果显示正常CB标本手工差示计数:中性粒细胞47.8±10.7%,淋巴细胞31.2±9.8%,单核细胞10.0±4.0%,嗜酸性粒细胞3.0±2.5%,性别差异无统计学意义。在 44/100 个样品中观察到爆炸,每个样品平均为 0.5±0.7%,并且仅观察到轻微的左移。无论新生儿状态如何,样本中都存在大量大颗粒淋巴细胞(占淋巴细胞总数的 19.1±10.6%)和形态异常的淋巴细胞(占淋巴细胞总数的 12.4±5.4%)。早产 CB 样本与正常足月 CB 样本的差异显着,包括中性粒细胞/淋巴细胞比率的逆转和嗜碱性粒细胞的缺乏。

图4:根据新生儿状态区分主要类型白细胞计数。

图5: 根据新生儿状态区分淋巴细胞亚型计数。

图6:脐带血样本红细胞形态分析

总的来说,本研究描述了新生儿CB的正常值和独特的形态学特征。CB中丰富的形态异常淋巴细胞可能代表出生时免疫系统的不成熟状态。

 

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    2021-12-20 changfy
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    2022-04-04 windight
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    2021-11-22 fengyi812
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    2021-11-21 云同学

    学习了

    0

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    2021-11-21 马永芳

    学习了!!!

    0

拓展阅读

JAMA子刊:接受成人血或脐带血红细胞输注的早产儿,脑组织氧合有差异吗?

这项队列研究的结果提示,与输注CB-RBC相比,输注A-RBC可能与向早产儿脑组织提供更多的氧相关。这一发现可以解释先前观察到的低HbF和高ROP风险之间的关联。

再认识脐带血!孙自敏教授:我们为什么能对它寄予厚望

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孕妇阳了,会影响脐带血吗?

卫健委也在健康中国公众号上进行科普:“新冠病毒是呼吸道病毒,不会经输血传播。目前为止,全球尚没有新冠病毒通过输血途径传播的报道。

杜克大学系列研究发现脐带血显著改善脑瘫运动功能

杜克大学系列研究发现脐带血显著改善脑瘫运动功能

一份脐带血标本引发思考

将血涂片结果告知门诊医生后,医生综合之前产前诊断检查结果,判断胎儿不除外有血液系统疾病,并送脐带血做NGS,筛查有无相关致病基因。

Ann Hematol:强化免疫抑制疗法联合脐带血治疗重度再生障碍性贫血的多中心试验

该研究结果表明,与标准 IST 相比,IIST-UCB 作为没有 HLA 相同供体的 SAA 患者的有效疗法,可加速造血重建,从而提高早期 CR 率。

儿童恶性血液病脐带血移植专家共识

中华医学会儿科学分会血液学组 · 2016-11-01