Journal article
Endogenous SOD2 (Superoxide Dismutase) Regulates Platelet-Dependent Thrombin Generation and Thrombosis During Aging
Arteriosclerosis, thrombosis, and vascular biology, Vol.43(1), pp.79-91
01/2023
DOI: 10.1161/ATVBAHA.121.317735
PMCID: PMC9780178
PMID: 36325902
Abstract
BACKGROUND Reactive oxygen species (ROS) contribute to platelet hyperactivation during aging. Several oxidative pathways and antioxidant enzymes have been implicated; however, their mechanistic contributions during aging remain elusive. We hypothesized that mitochondria are an important source of platelet ROS and that mitochondrial SOD2 (superoxide dismutase) protects against mitochondrial ROS-driven platelet activation and thrombosis during aging. METHODS We studied littermates of platelet-specific SOD2-knockout (SOD2fl/flPf4Cre, pSOD2-KO) and control (SOD2fl/fl) mice at young (4-5 months) or old (18-20 months) ages. We examined agonist-induced platelet activation, platelet-dependent thrombin generation potential, and susceptibility to in vivo thrombosis. RESULTS Platelet αIIbβ3 activation, aggregation, and adhesion were increased to similar extents in aged mice of both genotypes compared with young mice. In contrast, the age-dependent increases in mitochondrial and total cellular ROS, calcium elevation, and phosphatidylserine exposure were augmented in platelets from pSOD2-KO mice compared with control mice. Aged pSOD2-KO mice showed increased platelet-dependent thrombin generation compared with aged control mice. In vivo, aged pSOD2-KO mice exhibited enhanced susceptibility to carotid artery and pulmonary thrombosis compared to aged control mice. Adoptive transfer of platelets from aged pSOD2-KO but not aged control mice increased thrombotic susceptibility in aged host mice, suggesting a prothrombotic effect of platelet pSOD2 deficiency. Treatment with avasopasem manganese (GC4419), a SOD mimetic, decreased platelet mitochondrial pro-oxidants, cellular ROS levels, and inhibited procoagulant platelet formation and arterial thrombosis in aged mice. CONCLUSIONS Platelet mitochondrial ROS contributes to age-related thrombosis and endogenous SOD2 protects from platelet-dependent thrombin generation and thrombosis during aging.
Details
- Title: Subtitle
- Endogenous SOD2 (Superoxide Dismutase) Regulates Platelet-Dependent Thrombin Generation and Thrombosis During Aging
- Creators
- Vijay K Sonkar - Roy J. and Lucille A. Carver College of MedicineAlicia S Eustes - Roy J. and Lucille A. Carver College of MedicineAzaj Ahmed - Roy J. and Lucille A. Carver College of MedicineMelissa Jensen - Roy J. and Lucille A. Carver College of MedicineMitali V Solanki - Roy J. and Lucille A. Carver College of MedicineJagadish Swamy - Roy J. and Lucille A. Carver College of MedicineRahul Kumar - Roy J. and Lucille A. Carver College of MedicineTrevor P Fidler - Roy J. and Lucille A. Carver College of MedicineJon C D Houtman - Roy J. and Lucille A. Carver College of MedicineBryan G Allen - Roy J. and Lucille A. Carver College of MedicineDouglas R SpitzE Dale Abel - Roy J. and Lucille A. Carver College of MedicineSanjana Dayal - Roy J. and Lucille A. Carver College of Medicine
- Resource Type
- Journal article
- Publication Details
- Arteriosclerosis, thrombosis, and vascular biology, Vol.43(1), pp.79-91
- DOI
- 10.1161/ATVBAHA.121.317735
- PMID
- 36325902
- PMCID
- PMC9780178
- NLM abbreviation
- Arterioscler Thromb Vasc Biol
- ISSN
- 1079-5642
- eISSN
- 1524-4636
- Language
- English
- Electronic publication date
- 11/03/2022
- Date published
- 01/2023
- Academic Unit
- Microbiology and Immunology; Hematology, Oncology, and Blood & Marrow Transplantation; Pathology; Iowa Neuroscience Institute; Radiation Oncology; Fraternal Order of Eagles Diabetes Research Center; Endocrinology and Metabolism; Internal Medicine
- Record Identifier
- 9984309760102771
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