Cardioprotection through a PKC-dependent decrease in myofilament ATPase.

W Glen Pyle; Yi Chen; Polly A Hofmann

doi:10.1152/ajpheart.00076.2003

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PubMed · 12763745

Cardioprotection through a PKC-dependent decrease in myofilament ATPase.

W Glen Pyle·Yi Chen·Polly A Hofmann

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Abstract

Activation of myocardial kappa-opioid receptor-protein kinase C (PKC) pathways may improve postischemic contractile function through a myofilament reduction in ATP utilization. To test this, we first examined the effects of PKC inhibitors on kappa-opioid receptor-dependent cardioprotection. The kappa-opioid receptor agonist U50,488H (U50) increased postischemic left ventricular developed pressure and reduced postischemic end-diastolic pressure compared with controls. PKC inhibitors abolished the cardioprotective effects of U50. To determine whether kappa-opioid-PKC-dependent decreases in Ca2+-dependent actomyosin Mg2+-ATPase could account for cardioprotection, we subjected hearts to three separate actomyosin ATPase-lowering protocols. We observed that moderate decreases in myofibrillar ATPase were equally cardioprotective as kappa-opioid receptor stimulation. Immunoblot analysis and confocal microscopy revealed a kappa-opioid-induced increase in myofilament-associated PKC-epsilon, and myofibrillar Ca2+-independent PKC activity was increased after kappa-opioid stimulation. This PKC-myofilament association led to an increase in troponin I and C-protein phosphorylation. Thus we propose PKC-epsilon activation and translocation to the myofilaments causes a decrease in actomyosin ATPase, which contributes to the kappa-opioid receptor-dependent cardioprotective mechanism.

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W Glen Pyle, Yi Chen, Polly A Hofmann. 2003-05-22. Cardioprotection through a PKC-dependent decrease in myofilament ATPase.. https://doi.org/10.1152/ajpheart.00076.2003

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