The potential of melatonin in the prevention and attenuation of oxidative hemolysis and myocardial injury from cd147 SARS-CoV-2 spike protein receptor binding
Melatonin for hemolysis in COVID-19
Abstract
The rapid escalation of pandemic health threats associated with the novel, pathogenic SARS-CoV-2 coronavirus poses unprecedented challenges as proven effective vaccines and drugs have yet to be produced. Refractory hypoxemia and myocardial injury have been observed as two of the major causes of fatality in COVID-19 patients. SARS-CoV-2 spike (S) protein binding to broadly expressed CD147 receptors on erythrocytes causes oxidative hemolysis that may result in refractory hypoxemia and myocardial injury. Both of these life-threatening conditions are further exacerbated by imbalance in ACE2 from spike (S) protein receptor binding. Dysregulation in the CD147-cyclophilin A signaling pathway, together with altered calcium signaling from SARS-CoV-2 ion channel activities, may contribute to hypercoagulation, thrombosis, and cardiac remodeling resulting in heart failure. Melatonin is an ancient pleiotropic molecule with recognized antioxidant properties that is essential for the protection of erythrocytes from oxidative hemolysis. Found in erythrocytes, melatonin can reverse hemolytic anemia, normalize heme synthesis, restore lymphocytes and platelet counts, and reduce vessel permeability during an acute hemolytic crisis by maintaining intracellular calcium homeostasis and reduction of oxidative stress. In acute hypoxic conditions, melatonin is cardioprotective via blunting of cardiopulmonary response to hypoxia and suppressing hypoxia pathways. Melatonin normalizes endothelial-dependent nitric oxide production to prevent multiple organ damage from hypercoagulability, thrombosis, and hypertension associated with oxidative hemolysis and ACE2 deficiency, protecting cardiomyocytes from hypertrophy. This review discusses the full potential of melatonin as a safe and effective therapeutic intervention for the prevention and attenuation of hemoglobinopathies, refractory hypoxemia and myocardial injury during critical COVID-19 infections.
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