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Hamostaseologie
DOI: 10.1055/a-2462-6667
Original Article

Platelet Reduction in Rats Exposed to Chronic Hypoxia Is Associated with Interaction of Glycoprotein Ib Alpha von Willebrand Factor

Zhuoya Wang   *
1   School of Medicine, Research Center for High Altitude Medicine, Qinghai University, Xining, China
2   Geriatric department, Qinghai University Affiliated Hospital, Xining, China
3   Key Laboratory of Application and Foundation for High Altitude Medicine Research, Qinghai Province, Xining, China
,
Drolma Gomchok   *
1   School of Medicine, Research Center for High Altitude Medicine, Qinghai University, Xining, China
3   Key Laboratory of Application and Foundation for High Altitude Medicine Research, Qinghai Province, Xining, China
,
Yi Ye
1   School of Medicine, Research Center for High Altitude Medicine, Qinghai University, Xining, China
3   Key Laboratory of Application and Foundation for High Altitude Medicine Research, Qinghai Province, Xining, China
,
Yi Wen
4   Department of General Surgery & Pancreatic Injury and Repair Key Laboratory of Sichuan Province, The General Hospital of Western Theater Command (Chengdu Military General Hospital), Chengdu, China
,
Tana Wuren
1   School of Medicine, Research Center for High Altitude Medicine, Qinghai University, Xining, China
3   Key Laboratory of Application and Foundation for High Altitude Medicine Research, Qinghai Province, Xining, China
› Institutsangaben
Funding This work was supported by the Sichuan Science and Technology Program (2023YFQ0068); the General Hospital of Western Theater Command (2021-XZYG-C30).
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Abstract

Chronic high-altitude hypoxia is associated with reduced platelet count, but it is unclear whether the decrease in platelet count is due to impaired production or increased clearance. This study examines how hypoxia affects platelet production and apoptosis and elucidates the impact of glycoprotein Ibα–von Willebrand factor interaction on platelets in rats using a hypobaric hypoxia chamber. The results showed that the number of megakaryocytes increased under hypoxia; however, the levels of differentiation and polyploidy decreased, while those of apoptosis increased. Platelet production did not reduce according to the reticulated platelet percentage, while platelet apoptosis enhanced; these results suggest that increased platelet clearance was the main reason behind platelet reduction. Our previous microarray results indicated that glycoprotein Ibα (GPIbα) expression increased under hypoxia, which was a protein involved in platelet clearance; therefore, we examined the interaction of platelet GPIbα with the von Willebrand factor (vWF) both in vivo and in vitro to explore the effect of this process on platelets and whether it is related to platelet apoptosis. Under hypoxia, the stronger interaction between GPIbα and vWF promoted platelet apoptosis; inhibiting this interaction reduced platelet apoptosis and increased platelet counts. Platelet reduction is associated with apoptosis induced by the interaction between GPIbα and vWF.

Keywords

apoptosis - glycoprotein Ib alpha - hypoxia - platelet - von Willebrand factor

Data Availability

The datasets generated for this study can be found in the figshare database (https://doi.org/10.6084/m9.figshare.23993115).


Authors' Contributions

T.W. and Z.W. conceived and designed the research; Z.W. and D.G. performed the experiments and analysed the data; Z.W. and Y.Y. prepared the figures; Y.Y. assisted in the experiment; Z.W. and D.G. drafted and revised the manuscript; and Y.W. and T.W. approved the final version of the manuscript. Z.W. and D.G. contributed equally to this work and should be considered co-first authors.


* These authors contributed equally to this work and should be considered co-first authors.




Publikationsverlauf

Eingereicht: 13. Juni 2024

Angenommen: 05. November 2024

Artikel online veröffentlicht:
28. März 2025

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