AI Article Synopsis
- Lysyl oxidase (LOX) is found to be overexpressed in conditions like arterial stenosis and myeloproliferative neoplasms (MPNs), with elevated levels in both mouse models and patients.
- Transgenic mice engineered to express LOX specifically in megakaryocytes and platelets (Pf4-Lox(tg/tg)) showed a significant reduction in time to vessel occlusion after injury, indicating increased thrombus formation tendency.
- The study reveals that LOX enhances platelet activation by improving adhesion to collagen and amplifying their aggregation response, suggesting its role in thrombosis via the collagen receptor integrin α2β1.
Article Abstract
Lysyl oxidase (LOX) is overexpressed in various pathologies associated with thrombosis, such as arterial stenosis and myeloproliferative neoplasms (MPNs). LOX is elevated in the megakaryocytic lineage of mouse models of MPNs and in patients with MPNs. To gain insight into the role of LOX in thrombosis and platelet function without compounding the influences of other pathologies, transgenic mice expressing LOX in wild-type megakaryocytes and platelets (Pf4-Lox(tg/tg)) were generated. Pf4-Lox(tg/tg) mice had a normal number of platelets; however, time to vessel occlusion after endothelial injury was significantly shorter in Pf4-Lox(tg/tg) mice, indicating a higher propensity for thrombus formation in vivo. Exploring underlying mechanisms, we found that Pf4-Lox(tg/tg) platelets adhere better to collagen and have greater aggregation response to lower doses of collagen compared with controls. Platelet activation in response to the ligand for collagen receptor glycoprotein VI (cross-linked collagen-related peptide) was unaffected. However, the higher affinity of Pf4-Lox(tg/tg) platelets to the collagen sequence GFOGER implies that the collagen receptor integrin α2β1 is affected by LOX. Taken together, our findings demonstrate that LOX enhances platelet activation and thrombosis.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4797025 | PMC |
| http://dx.doi.org/10.1182/blood-2015-02-629667 | DOI Listing |
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