Key result
Autoimmunity against the second extracellular loop of beta1-adrenergic receptors induced profound beta-AR desensitization and myocardial hypertrophy in vivo, which was prevented by bisoprolol.
Why the study?
Does autoimmunity against the second extracellular loop of beta1-ARs induce beta-AR desensitization and myocardial hypertrophy in vivo, and is it prevented by bisoprolol?
Population
Japanese white rabbits (n=36 total: beta+biso n=10, beta n=13, control n=13)
Comparison
Immunization with a synthetic peptide… vs Vehicle without bisoprolol treatment
Design
Preclinical
Follow-up
6 months
Authors
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Clarifies beta1-AR autoimmunity in rabbit cardiomyopathy models; leaves open human mechanistic relevance and practice implications.
Does autoimmunity against the second extracellular loop of beta1-ARs induce beta-AR desensitization and myocardial hypertrophy in vivo, and is it prevented by bisoprolol?
Autoimmunity against the second extracellular loop of beta1-adrenergic receptors induces beta-AR desensitization and myocardial hypertrophy in vivo, which can be prevented by bisoprolol.
Iwata et al. (2001) studied Myocardial hypertrophy and cardiac dysfunction (n=36). Immunization with synthetic peptide corresponding to the second extracellular loop of beta1-AR (with or without bisoprolol) vs. Vehicle without bisoprolol treatment was evaluated on Beta-AR desensitization and myocardial hypertrophy. Autoimmunity against the second extracellular loop of beta1-adrenergic receptors induced profound beta-AR desensitization and myocardial hypertrophy in vivo, which was prevented by bisoprolol.
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