Emergence of AnnexinVpos CD31neg CD42blow/neg extracellular vesicles in plasma of humans at extreme altitude.

Utermöhlen, Olaf; Jakobshagen, Kristin; Blissenbach, Birgit; Wiegmann, Katja; Merz, Tobias; Pichler Hefti, Jacqueline; Krönke, Martin (2019). Emergence of AnnexinVpos CD31neg CD42blow/neg extracellular vesicles in plasma of humans at extreme altitude. PLoS ONE, 14(8), e0220133. Public Library of Science 10.1371/journal.pone.0220133

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BACKGROUND Hypobaric hypoxia has been reported to cause endothelial cell and platelet dysfunction implicated in the formation of microvascular lesions, and in its extremes may contribute to vascular leakage in high altitude pulmonary edema or blood brain barrier disruption leading to cerebral micro-hemorrhage (MH). Platelet function in the development of microvascular lesions remained ill defined, and is still incompletely understood. In this study platelet- and endothelial cell-derived extracellular vesicles (PEV and EEV, respectively) and cell adhesion molecules were characterized in plasma samples of members of a high altitude expedition to delineate the contribution of platelets and endothelial cells to hypobaric hypoxia-induced vascular dysfunction. METHODS AND FINDINGS In this observational study, platelet and endothelial cell-derived extracellular vesicles were analysed by flow-cytometry in plasma samples from 39 mountaineers participating in a medical research climbing expedition to Himlung Himal, Nepal, 7,050m asl. Megakaryocyte/platelet-derived AnnexinVpos, PECAM-1 (CD31) and glycoprotein-1b (GP1b, CD42b) positive extracellular vesicles (PEV) constituted the predominant fraction of EV in plasma samples up to 6,050m asl. Exposure to an altitude of 7,050m led to a marked decline of CD31pos CD42neg EEV as well as of CD31pos CD42bpos PEV at the same time giving rise to a quantitatively prevailing CD31neg CD42blow/neg subpopulation of AnnexinVpos EV. An almost hundredfold increase in the numbers of this previously unrecognized population of CD31neg CD42blow/neg EV was observed in all participants reaching 7,050m asl. CONCLUSIONS The emergence of CD31neg CD42blow/neg EV was observed in all participants and thus represents an early hypoxic marker at extreme altitude. Since CD31 and CD42b are required for platelet-endothelial cell interactions, these hypobaric hypoxia-dependent quantitative and phenotypic changes of AnnexinVpos EV subpopulations may serve as early and sensitive indicators of compromised vascular homeostasis.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Intensive Care, Emergency Medicine and Anaesthesiology (DINA) > Clinic of Intensive Care
04 Faculty of Medicine > Department of Gastro-intestinal, Liver and Lung Disorders (DMLL) > Clinic of Pneumology

UniBE Contributor:

Merz, Tobias and Pichler Hefti, Jacqueline Renée

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1932-6203

Publisher:

Public Library of Science

Language:

English

Submitter:

Jsabelle Arni

Date Deposited:

09 Dec 2019 13:57

Last Modified:

09 Dec 2019 13:57

Publisher DOI:

10.1371/journal.pone.0220133

PubMed ID:

31369589

BORIS DOI:

10.7892/boris.136250

URI:

https://boris.unibe.ch/id/eprint/136250

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