McCormack, JJ;
Harrison-Lavoie, K;
Cutler, DF;
(2020)
Human endothelial cells size-select their secretory granules for exocytosis to modulate their functional output.
Journal of Thrombosis and Haemostasis
, 18
(1)
pp. 243-254.
10.1111/jth.14634.
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Abstract
BACKGROUND: The secretory granules of endothelial cells, Weibel-Palade bodies, are released in response to numerous extracellular signals. Their cargo is critical to many vascular functions including haemostasis and inflammation. This presents a fundamental problem; how can these cells initiate tailor-made responses from the release of a single type of organelle, each with similar cargo? Each cell contains Weibel-Palade bodies in a wide range of sizes, and we have shown that experimentally-shortening these organelles disproportionately reduces their ability to initiate haemostasis in vitro, leaving leukocyte recruitment unaffected. Could the production of this range of sizes underpin differential responses? OBJECTIVES: To determine whether different agonists drive the exocytosis of different sizes of Weibel-Palade bodies. METHODS: We used a high-throughput automated unbiased imaging workflow to analyse the sizes of Weibel-Palade bodies within HUVECs before and after agonist activation to determine changes in organelle size distributions. RESULTS: We found that a subset of agonists differentially evoke the release of the longest, most pro-haemostatic organelles. Inhibiting the release of these longest organelles by just 15% gives a fall of 60% in an assay of secreted VWF function. CONCLUSIONS: The size-selection of granules for exocytosis represents a novel layer of control, allowing endothelial cells to provide diverse responses to different signals via the release of a single type of organelle.
| Type: | Article |
|---|---|
| Title: | Human endothelial cells size-select their secretory granules for exocytosis to modulate their functional output |
| Location: | England |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1111/jth.14634 |
| Publisher version: | https://doi.org/10.1111/jth.14634 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript . For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Endothelial Cells, Exocytosis, Organelle Size, Weibel-Palade Bodies, von Willebrand Factor |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Lab for Molecular Cell Bio MRC-UCL |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10082089 |
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