Elevated 5-HTR7 deteriorates dysregulated megakaryocytopoiesis in immune thrombocytopenic purpura via up-regulating the PKA/Orai1/ERK1/2 pathway.

IF 7.9 1区 医学 Q1 HEMATOLOGY
Meng Zhou,Haohao Han,Jiaqian Qi,Ziyan Zhang,Xiaofei Song,Xueqian Li,Tiantian Chu,Depei Wu,Yue Han
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引用次数: 0

Abstract

Dysregulated megakaryocytopoiesis contributes to reduced platelet counts in immune thrombocytopenic purpura (ITP), yet the mechanism remains elusive. Although 5-hydroxytryptamine receptor 7 (5-HTR7) has been implicated in megakaryocyte (MK) biology, its pathogenic involvement in ITP is undefined. This study investigated the impact of 5-HTR7 on MK maturation in ITP using flow cytometry, immunofluorescence, and single-cell RNA sequencing (scRNA-seq). Analyses revealed elevated 5-HTR7 expression on MKs from ITP patients compared to healthy controls. Pharmacological inhibition of 5-HTR7 using SB269970A not only rescued MK maturation defects in vitro but also restored circulating platelet levels in a mouse model of active ITP. scRNA-seq coupled with western blot validation identified ERK1/2 phosphorylation in SB269970A-treated MKs. Mechanistically, 5-HTR7 impaired MK maturation through the PKA/Orai1/ERK axis by suppressing store-operated calcium entry (SOCE), as confirmed via confocal microscopy. In conclusion, elevated expression of 5-HTR7 impairs maturation of MKs causing lower platelet count in ITP, offering a potential therapeutic target for ITP management.
升高的5-HTR7通过上调PKA/Orai1/ERK1/2通路,恶化免疫性血小板减少性紫癜中失调的巨核细胞生成。
巨核细胞生成失调导致免疫性血小板减少性紫癜(ITP)患者血小板计数减少,但其机制尚不明确。虽然5-羟色胺受体7 (5-HTR7)与巨核细胞(MK)生物学有关,但其在ITP中的致病作用尚不明确。本研究利用流式细胞术、免疫荧光和单细胞RNA测序(scRNA-seq)研究了5-HTR7对ITP中MK成熟的影响。分析显示,与健康对照相比,ITP患者mk中5-HTR7表达升高。SB269970A对5-HTR7的药理抑制不仅能在体外修复MK成熟缺陷,还能恢复活动性ITP小鼠模型的循环血小板水平。scRNA-seq结合western blot验证在sb269970a处理的mk中发现ERK1/2磷酸化。通过共聚焦显微镜证实,5-HTR7通过PKA/Orai1/ERK轴抑制储存操作的钙进入(SOCE),从而损害MK成熟。综上所述,5-HTR7的表达升高会损害ITP中mk的成熟,导致血小板计数降低,为ITP的治疗提供了一个潜在的治疗靶点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Haematologica
Haematologica 医学-血液学
CiteScore
14.10
自引率
2.00%
发文量
349
审稿时长
3-6 weeks
期刊介绍: Haematologica is a journal that publishes articles within the broad field of hematology. It reports on novel findings in basic, clinical, and translational research. Scope: The scope of the journal includes reporting novel research results that: Have a significant impact on understanding normal hematology or the development of hematological diseases. Are likely to bring important changes to the diagnosis or treatment of hematological diseases.
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