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Bissinger R, Petkova-Kirova P, Mykhailova O, Oldenborg PA, Novikova E, Donkor DA, Dietz T, Bhuyan AAM, Sheffield WP, Grau M, Artunc F, Kaestner L, Acker JP, Qadri SM. Thrombospondin-1/CD47 signaling modulates transmembrane cation conductance, survival, and deformability of human red blood cells. Cell Commun Signal 2020; 18:155. [PMID: 32948210 PMCID: PMC7502024 DOI: 10.1186/s12964-020-00651-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 08/24/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Thrombospondin-1 (TSP-1), a Ca2+-binding trimeric glycoprotein secreted by multiple cell types, has been implicated in the pathophysiology of several clinical conditions. Signaling involving TSP-1, through its cognate receptor CD47, orchestrates a wide array of cellular functions including cytoskeletal organization, migration, cell-cell interaction, cell proliferation, autophagy, and apoptosis. In the present study, we investigated the impact of TSP-1/CD47 signaling on Ca2+ dynamics, survival, and deformability of human red blood cells (RBCs). METHODS Whole-cell patch-clamp was employed to examine transmembrane cation conductance. RBC intracellular Ca2+ levels and multiple indices of RBC cell death were determined using cytofluorometry analysis. RBC morphology and microvesiculation were examined using imaging flow cytometry. RBC deformability was measured using laser-assisted optical rotational cell analyzer. RESULTS Exposure of RBCs to recombinant human TSP-1 significantly increased RBC intracellular Ca2+ levels. As judged by electrophysiology experiments, TSP-1 treatment elicited an amiloride-sensitive inward current alluding to a possible Ca2+ influx via non-selective cation channels. Exogenous TSP-1 promoted microparticle shedding as well as enhancing Ca2+- and nitric oxide-mediated RBC cell death. Monoclonal (mouse IgG1) antibody-mediated CD47 ligation using 1F7 recapitulated the cell death-inducing effects of TSP-1. Furthermore, TSP-1 treatment altered RBC cell shape and stiffness (maximum elongation index). CONCLUSIONS Taken together, our data unravel a new role for TSP-1/CD47 signaling in mediating Ca2+ influx into RBCs, a mechanism potentially contributing to their dysfunction in a variety of systemic diseases. Video abstract.
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Affiliation(s)
- Rosi Bissinger
- Department of Internal Medicine, Division of Endocrinology, Diabetology, and Nephrology, Universitätsklinikum Tübingen, Tübingen, Germany
| | | | - Olga Mykhailova
- Centre for Innovation, Canadian Blood Services, Edmonton, AB, Canada.,Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, Canada
| | - Per-Arne Oldenborg
- Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - Elena Novikova
- Department of Integrative Medical Biology, Umeå University, Umeå, Sweden
| | - David A Donkor
- Centre for Innovation, Canadian Blood Services, Hamilton, ON, Canada.,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Thomas Dietz
- Institute of Molecular and Cellular Sports Medicine, German Sport University of Cologne, Köln, Germany
| | | | - William P Sheffield
- Centre for Innovation, Canadian Blood Services, Hamilton, ON, Canada.,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada
| | - Marijke Grau
- Institute of Molecular and Cellular Sports Medicine, German Sport University of Cologne, Köln, Germany
| | - Ferruh Artunc
- Department of Internal Medicine, Division of Endocrinology, Diabetology, and Nephrology, Universitätsklinikum Tübingen, Tübingen, Germany.,Institute of Diabetes Research and Metabolic Diseases of the Helmholtz Center Munich at Eberhard-Karls University, Tübingen, Germany.,German Center for Diabetes Research (DZD), Eberhard-Karls University, Tübingen, Germany
| | - Lars Kaestner
- Theoretical Medicine and Biosciences, Saarland University, Homburg, Germany.,Experimental Physics, Saarland University, Saarbruecken, Germany
| | - Jason P Acker
- Centre for Innovation, Canadian Blood Services, Edmonton, AB, Canada.,Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, AB, Canada
| | - Syed M Qadri
- Centre for Innovation, Canadian Blood Services, Hamilton, ON, Canada. .,Department of Pathology and Molecular Medicine, McMaster University, Hamilton, ON, Canada. .,Faculty of Health Sciences, Ontario Tech University, Oshawa, ON, Canada.
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