Biomolecules:MicroRNA-34a在毛囊动态发育和成熟中起到重要作用

2022-07-21 医路坦克 MedSci原创

斑秃(alopecia areata, AA)是一种自身免疫性脱发疾病,其病理生理机制尚不完全清楚,本文研究揭示了MicroRNA-34a在人类毛囊的动态发育和成熟中的作用。

microRNAs (miRNAs)广泛分布于人类基因组中,是一种长度约为19-26个核苷酸的小而高度保守的非编码rna,可调控高达60%的蛋白质编码基因的表达。新兴研究报道microrna在人类疾病中扮演新的关键角色。

目前,斑秃(alopecia areata, AA)是一种自身免疫性脱发疾病,其病理生理机制尚不完全清楚,认为遗传易感性、自身免疫性损害和环境因素的相互作用是疾病发生发展的重要因素。动物模型显示在表皮形态发生过程中存在离散的差异表达mirna。它们在维持出生后皮肤中毛囊基质细胞的高度增殖中起着重要作用。然而,很少有研究揭示了microrna在人类毛囊的动态发育和成熟中的作用

最近的研究表明,microRNAs (miRNAs)在多个细胞过程中都有影响,包括表皮和毛囊生物学。单核苷酸多态性(SNPs)可以改变基因表达水平,这可能会引起自身免疫反应。

本病例对照研究包括 480 名参与者(每个病例/对照组240人)。MicroRNA-34a基因(MIR-34A) rs2666433A/G变异采用实时等位基因鉴别聚合酶链反应(PCR)进行基因分型。此外,通过定量逆转录PCR (qRT-PCR)对循环中的miR-34a水平进行定量。

在脱发组和非脱发组的比较中,与对照组相比,患者中a等位基因的频率更高:28对18% (p < 0.001);A/A基因型:9对2%;A/G基因型:39 对32% (p < 0.001)。A/A和A/G载体在杂合子比较(OR = 1.83, 95% CI = 1.14 ~ 2.93)、纯合子比较(OR = 4.19, 95% CI = 1.33 ~ 13.1)、显性(OR = 2.0, 95% CI = 1.27 ~ 3.15)、隐性(OR = 3.36, 95% CI = 1.08 ~ 10.48)、过显性(OR = 1.65, 95% CI = 1.04 ~ 32.63)和对数加性(OR = 1.91, 95% CI = 1.3 ~ 2.82)模型下更容易发生脱发。在脱发患者中,血清miR-34a表达水平上调,中位和四分位变化为27.3(1.42-2430)。A/A 基因型患者明显高于对照组(p < 0.01)。携带杂合子基因型(rs2666433 * A/G)的患者发生更严重疾病分级的可能性增加2倍。按性别分层分析结果相同。高表达水平与伴随的自身免疫性疾病相关(p = 0.001),特别是 SLE (p = 0.007)和白癜风(p = 0.049)。

图1  毛囊相关基因本体术语中miR-34a的功能富集分析,如图所示,miR-34a参与了5个生物学过程,列出了每个通路中经实验验证的重要靶基因。

图2  脱发患者的脱发表型类型(A)和伴随的自身免疫性疾病(B)。以频率表示的数据(百分比)

图3    MIR34A rs2666433多态性的等位基因(A)和基因型(B)频率。计数沿着y轴表示,百分比显示在横杆上。采用卡方检验。p值< 0.05为差异有统计学意义。

图4   miR-34a-5p在脱发患者和对照组中的Fold change。(A)与对照组相比,脱发的基因上调(红色虚线)。采用Mann-Whitney U检验。(B)根据MIR34A基因多态性的表达水平。采用Kruskal-Wallis试验。(C)表达与基因型的相关性分析。采用Spearman相关检验。相关系数(r)、R2和回归方程如下所示。p值< 0.05为差异有统计学意义。

总之,MIR34A rs2666433 (A/G)变异与研究人群中AA的风险和严重程度相关。此外,高循环miR-34a水平可能在疾病发病中发挥作用。

文献来源:Maher SA,  Ismail NA,  Toraih EA,Hair Follicle-Related MicroRNA-34a Serum Expression and rs2666433A/G Variant in Patients with Alopecia: A Cross-Sectional Analysis.Biomolecules 2022 Apr 19;12(5)

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    2023-05-21 xjy02
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    2022-11-01 sunylz
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    2022-07-21 neurowu
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    2022-07-21 zhouqu_8

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