Key result
Nitroxyl activates SERCA2a dephosphorylation in a phospholamban-dependent manner by targeting phospholamban thiols to produce a disulfide bond that relieves inhibition of the calcium pump.
Why the study?
Does Nitroxyl (HNO) activate SERCA2a via direct interaction with SERCA2a or its regulatory protein phospholamban (PLN) in insect cell microsomes?
Population
Insect cell microsomes expressing SERCA2a with or without PLN (wild-type and Cys --> Ala mutant)
Comparison
Nitroxyl (HNO) donated by Angeli's salt vs Microsomes without PLN or with mutant PLN
Design
Preclinical
Authors
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Hypothesis-generating for nitroxyl in heart failure; leaves open clinical translation pending mammalian and human studies.
Does Nitroxyl (HNO) activate SERCA2a via direct interaction with SERCA2a or its regulatory protein phospholamban (PLN) in insect cell microsomes?
Nitroxyl activates the cardiac SR calcium pump by targeting phospholamban thiols to form a disulfide bond, relieving pump inhibition.
Froehlich et al. (2008) studied this question. Nitroxyl (HNO) was evaluated on SERCA2a activation (dephosphorylation). Nitroxyl activates SERCA2a dephosphorylation in a phospholamban-dependent manner by targeting phospholamban thiols to produce a disulfide bond that relieves inhibition of the calcium pump.
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