Oxidative stress in early metabolic syndrome impairs cardiac RyR2 and SERCA2a activity and modifies the interplay of these proteins during Ca 2+ waves
2021
unknown
Zugriff:
We investigated how oxidative stress (OS) alters Ca 2+ handling in ventricular myocytes in early metabolic syndrome (MetS) in sucrose-fed rats. The effects of N -acetyl cysteine (NAC) or dl-Dithiothreitol (DTT) on systolic Ca 2+ transients (SCaTs), diastolic Ca 2+ sparks (CaS) and Ca 2+ waves (CaW), recorded by confocal techniques, and L-type Ca 2+ current (I Ca ), assessed by whole-cell patch clamp, were evaluated in MetS and Control cells. MetS myocytes exhibited decreased SCaTs and CaS frequency but unaffected CaW propagation. In Control cells, NAC/DTT reduced RyR2/SERCA2a activity blunting SCaTs, CaS frequency and CaW propagation, suggesting that basal ROS optimised Ca 2+ signalling by maintaining RyR2/SERCA2a function and that these proteins facilitate CaW propagation. Conversely, NAC/DTT in MetS recovered RyR2/SERCA2a function, improving SCaTs and CaS frequency, but unexpectedly decreasing CaW propagation. We hypothesised that OS decreases RyR2/SERCA2a activity at early MetS, and while decreased SERCA2a favours CaW propagation, diminished RyR2 restrains it.
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Oxidative stress in early metabolic syndrome impairs cardiac RyR2 and SERCA2a activity and modifies the interplay of these proteins during Ca 2+ waves
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Autor/in / Beteiligte Person: | Norma Leticia Gómez-Viquez (10285471) ; Jaime Balderas-Villalobos (10285474) ; Ma Dolores Bello-Sánchez (10285477) ; Maritza Mayorga-Luna (10285480) ; Patrick Mailloux-Salinas (10285483) ; Maricela García-Castañeda (10285486) ; Erick Benjamín Ríos-Pérez (10285489) ; Marco Antonio Mártinez-Ávila (10285492) ; Luz del Carmen Camacho-Castillo (10285495) ; Guadalupe Bravo (10285498) ; Guillermo Ávila (10285501) ; Julio Altamirano (10285504) ; Karla Carvajal (2176196) |
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Veröffentlichung: | 2021 |
Medientyp: | unknown |
DOI: | 10.6084/m9.figshare.14195380.v1 |
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