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Impaired Activity of Ryanodine Receptors Contributes to Calcium Mishandling in Cardiomyocytes of Metabolic Syndrome Rats
Conclusion Principal findings of this work are that abnormal Ca2+ transient amplitude, contractile dysfunction; and impaired relaxation of MetS cardiomyocytes underlies intrinsic dysfunctional RyR2 and SERCA pump. Abnormal activity of RyRs was evidenced by its decreased ability to bind [3H]-ryanodine. Although the MetS condition does not modify RyR2 protein expression, its phosphorylation at Ser2814 is decreased, which impairs its capacity for activation during ECC. The dysfunctional RyRs, together with a decreased activity of SERCA pump due to decreased Thr17-PLN phosphorylation suggest a downregulation of CaMKII in MetS...
Source: Frontiers in Physiology - April 29, 2019 Category: Physiology Source Type: research

Antidiabetic drugs for preventing atrial fibrillation: A new revolution?
Type 2 diabetes mellitus (DM) and atrial fibrillation (AF) are 2 of the great epidemics of our time. DM affects an estimated 8.5% of adults in the United States1 and is associated with an increased risk of cardiovascular events, including AF.2 AF in turn affects up to an estimated 12.5% of adults older than 65 years in the United States, decreases quality of life, and increases the risks of heart failure, stroke, and death.3,4 In 2015, the EMPA-REG OUTCOME (BI 10773 [Empagliflozin] Cardiovascular Outcome Event Trial in Type 2 Diabetes Mellitus Patients) randomized controlled trial (RCT), which assessed the sodium glucose c...
Source: Heart Rhythm - April 7, 2021 Category: Cardiology Authors: William F. McIntyre, Jeff S. Healey Tags: Editorial Commentary Source Type: research