The contribution of endothelial cell P-selectin to the microvascular flow of mouse sickle erythrocytes in vivo
Abstract
Microvascular occlusion in sickle cell disease can be initiated by adhesion of sickle red blood cells (RBCs) to the endothelium. Our objective in this study was to verify the relevance in vivo of our discovery that sickle RBCs adhere abnormally to endothelial P-selectin in vitro. We used computer-assisted intravital microscopy to characterize RBC flow velocity (V(RBC)) in mice. We found faster V(RBC) of sickle RBCs in P-selectin knock-out and control mice than in sickle cell mice, which have increased endothelial cell P-selectin expression. Agonist peptide for murine protease-activated receptor-1 (PAR-1), which selectively activates mouse endothelial cells but not platelets, was used to assess the effects of endothelial cell P-selectin on microvascular flow. Suffusion of venules with this agonist stopped flow promptly in normal and sickle mice but not in P-selectin knock-out mice or in control mice pretreated with anti-P-selectin monoclonal antibody or unfractionated heparin (UFH). Agonist-induced slowing of flow was reversed rapidly by suffusion with UFH, provided flow had not already stopped. We conclude that endothelial cell P-selectin contributes to the microcirculatory abnormalities in sickle cell disease and that blocking P-selectin may be useful for preventing painful vasoocclusion in sickle cell disease.
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Selectins interact with sickled red cells and leukocytes in the circulation to facilitate endothelial adhesion and other interactions, ultimately contributing to vascular occlusion and sickle cell crisis.
“selectins interact with sickled red cells and leukocytes in the circulation to facilitate endothelial adhesion and other interactions (924 -927) ultimately contributing to vascular occlusion and ' sickle cell crisis ' (928).”
From Biological roles of glycans (2017) · cites this paper as [926]
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- Authors
- Embury, S. H.
- Affiliations
- Brigham and Women's Hospital (US)
- Corresponding author
- Embury, S. H.
- Venue
- Blood
- Publisher
- American Society of Hematology
- Published
- 2004-11-15
- Volume
- 104
- Issue
- 10
- Pages
- 3378-3385
- ISSN
- 0006-4971 (ISSN-L)
- 1528-0020
- OpenAlex
- W1992525172
- Cited by
- 141
- References
- 75
- Citations by year
- 2026: 4 · 2025: 4 · 2024: 4 · 2023: 4 · 2022: 5 · 2021: 17 · 2020: 11 · 2019: 8 · 2018: 9 · 2017: 5 · 2016: 8 · 2015: 9 · 2014: 8 · 2013: 6 · 2012: 1
- FWCI
- 2.03
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Blood (publishedVersion, public-domain)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (5p60hl020985-25, n01co12400-79-0-22, 5r01hl064396-03, 5r01hl067432-02)
- University of California, Davis
- National Heart, Lung, and Blood Institute (HL-31579, HL20985, R01HL031579, HL 64396, HL67432)
- National Cancer Institute (N01CO12400)
- Solar Energy Technologies Office
- Topics
- Health Sciences › Medicine › Genetics › Hemoglobinopathies and Related Disorders
- Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Blood properties and coagulation
- Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
- Keywords
- sickle cell disease, P-selectin, endothelial cells, sickle erythrocytes, microvascular blood flow, red blood cell adhesion, microvascular occlusion, protease-activated receptor 1, heparin, intravital microscopy
- MeSH terms
- Anemia, Sickle Cell, Animals, Antibodies, Monoclonal, Blood Flow Velocity, Cell Adhesion, Endothelium, Vascular, Erythrocytes, Heparin, Leukocytes, Mice, Inbred C57BL, Mice, Mutant Strains, Microcirculation, P-Selectin, Receptor, PAR-1, Mice
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