Protein disulfide isomerase‐A1 regulates intraplatelet reactive oxygen species–thromboxane A2‐dependent pathway in human platelets
Background Platelet‐derived protein disulfide isomerase 1 (PDIA1) regulates thrombus formation, but its role in the regulation of platelet function is not fully understood. Aims The aim of this study was to characterize the role of PDIA1 in human platelets. Methods Proteomic analysis of PDI isoforms...
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Published in | Journal of thrombosis and haemostasis Vol. 20; no. 1; pp. 157 - 169 |
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Main Authors | , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Wiley Subscription Services, Inc
01.01.2022
John Wiley and Sons Inc |
Subjects | |
Online Access | Get full text |
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Summary: | Background
Platelet‐derived protein disulfide isomerase 1 (PDIA1) regulates thrombus formation, but its role in the regulation of platelet function is not fully understood.
Aims
The aim of this study was to characterize the role of PDIA1 in human platelets.
Methods
Proteomic analysis of PDI isoforms in platelets was performed using liquid chromatography tandem mass spectometry, and the expression of PDIs on platelets in response to collagen, TRAP‐14, or ADP was measured with flow cytometry. The effects of bepristat, a selective PDIA1 inhibitor, on platelet aggregation, expression of platelet surface activation markers, thromboxane A2 (TxA2), and reactive oxygen species (ROS) generation were evaluated by optical aggregometry, flow cytometry, ELISA, and dihydrodichlorofluorescein diacetate‐based fluorescent assay, respectively.
Results
PDIA1 was less abundant compared with PDIA3 in resting platelets and platelets stimulated with TRAP‐14, collagen, or ADP. Collagen, but not ADP, induced a significant increase in PDIA1 expression. Bepristat potently inhibited the aggregation of washed platelets induced by collagen or convulxin, but only weakly inhibited platelet aggregation induced by TRAP‐14 or thrombin, and had the negligible effect on platelet aggregation induced by arachidonic acid. Inhibition of PDIA1 by bepristat resulted in the reduction of TxA2 and ROS production in collagen‐ or thrombin‐stimulated platelets. Furthermore, bepristat reduced the activation of αIIbβ3 integrin and expression of P‐selectin.
Conclusions
PDIA1 acts as an intraplatelet regulator of the ROS‐TxA2 pathway in collagen‐GP VI receptor‐mediated platelet activation that is a mechanistically distinct pathway from extracellular regulation of αIIbβ3 integrin by PDIA3. |
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Bibliography: | Funding information This work was supported by funding from The National Centre for Research and Development (grant STRATEGMED1/233226/11/NCBR/2015 to S.Ch.), and partially by the Latvian National Fundamental and Applied Research Grant (grant No. Izp‐2018/1‐0143 to IK “Isoform selective PDI inhibitors: design, synthesis and SAR”). The open‐access publication of this article was funded by the Priority Research Area BioS under the program “Excellence Initiative – Research University” at the Jagiellonian University in Krakow. The equipment used for this work was sponsored in part by the Centre for Preclinical Research and Technology (CePT), a project cosponsored by the European Regional Development Fund and Innovative Economy, The National Cohesion Strategy of Poland. Manuscript handled by: X. Long Zheng Final decision: X. Long Zheng and 27‐Sep‐2021. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1538-7933 1538-7836 1538-7836 |
DOI: | 10.1111/jth.15539 |