Key result
Deficiency of NOS1 increases XOR-mediated superoxide production, depressing myocardial excitation-contraction coupling, which is reversible by XOR inhibition with allopurinol.
NOS1 negatively regulates XOR-mediated superoxide production, providing a direct antioxidant mechanism that protects myocardial excitation-contraction coupling.
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Hypothesis-generating for XOR inhibition in myocardial dysfunction; human studies required before clinical consideration.
Khan et al. (2004) studied Cardiac excitation-contraction coupling. NOS1 deficiency was evaluated on XOR-mediated superoxide production and myocardial excitation-contraction coupling. Deficiency of NOS1 increases XOR-mediated superoxide production, depressing myocardial excitation-contraction coupling, which is reversible by XOR inhibition with allopurinol.
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