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https://open.uns.ac.rs/handle/123456789/32474
Назив: | Effects of circulating extracellular microvesicles from spinal cord-injured adults on endothelial cell function | Аутори: | Brewster Madden Geoff Coombs Vinitius Garcia Jamie Hijmans Noah DeSouza Kelly Stockelman Otto Barak Tanja Mijacika Željko Dujić Jared Greiner Aaron Phillips Philip Ainslie Christopher DeSouza |
Кључне речи: | endothelial cell;microvesicle;spinal cord injury | Датум издавања: | 1-апр-2020 | Издавач: | Portland Press | Часопис: | Clinical Science | Сажетак: | People with spinal cord injury (SCI) have three- to four-fold greater risk of cardiovascular disease (CVD) compared with those without SCI. Although circulating extracellular microvesicles are key effectors of vascular health and disease, how their functional phenotype might be altered with SCI is unknown. The aim of the present study was to determine the effects of microvesicles isolated from SCI adults on endothelial cell inflammation and oxidative stress as well as endothelial nitric oxide (NO) synthase (eNOS) activation and tissue-type plasminogen activator (t-PA) expression. Eighteen young and middle-aged adults were studied: 10 uninjured (7M/3F; age: 39 ± 3 years) and 8 cervical level spinal cord injured (SCI; 7M/1F; 46 ± 4 years; cervical injury: C3: n=1; C5: n=4; C6: n=3). Circulating microvesicles were isolated, enumerated and collected from plasma by flow cytometry. Human umbilical vein endothelial cells (HUVECs) were cultured and treated with microvesicles from either the uninjured or SCI adults. Microvesicles from SCI adults did not affect cellular markers or mediators of inflammation and oxidative stress. However, microvesicles from the SCI adults significantly blunted eNOS activation, NO bioavailability and t-PA production. Intercellular expression of phosphorylated eNOS at Ser1177 and Thr495 sites, specifically, were ∼65% lower and ∼85% higher, respectively, in cells treated with microvesicles from SCI compared with uninjured adults. Decreased eNOS activity and NO production as well as impaired t-PA bioavailability renders the vascular endothelium highly susceptible to atherosclerosis and thrombosis. Thus, circulating microvesicles may contribute to the increased risk of vascular disease and thrombotic events associated with SCI. | URI: | https://open.uns.ac.rs/handle/123456789/32474 | ISSN: | 01435221 | DOI: | 10.1042/CS20200047 |
Налази се у колекцијама: | MDF Publikacije/Publications |
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