Meng Zhou,Haohao Han,Jiaqian Qi,Ziyan Zhang,Xiaofei Song,Xueqian Li,Tiantian Chu,Depei Wu,Yue Han
{"title":"Elevated 5-HTR7 deteriorates dysregulated megakaryocytopoiesis in immune thrombocytopenic purpura via up-regulating the PKA/Orai1/ERK1/2 pathway.","authors":"Meng Zhou,Haohao Han,Jiaqian Qi,Ziyan Zhang,Xiaofei Song,Xueqian Li,Tiantian Chu,Depei Wu,Yue Han","doi":"10.3324/haematol.2024.287287","DOIUrl":null,"url":null,"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.","PeriodicalId":12964,"journal":{"name":"Haematologica","volume":"5 1","pages":""},"PeriodicalIF":7.9000,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Haematologica","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.3324/haematol.2024.287287","RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"HEMATOLOGY","Score":null,"Total":0}
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.
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.