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. 1995 Mar;68(3):936–945. doi: 10.1016/S0006-3495(95)80269-9

Anesthetics alter the physical and functional properties of the Ca-ATPase in cardiac sarcoplasmic reticulum.

B S Karon 1, L M Geddis 1, H Kutchai 1, D D Thomas 1
PMCID: PMC1281817  PMID: 7756557

Abstract

We have studied the effects of the local anesthetic lidocaine, and the general anesthetic halothane, on the function and oligomeric state of the CA-ATPase in cardiac sarcoplasmic reticulum (SR). Oligomeric changes were detected by time-resolved phosphorescence anisotropy (TPA). Lidocaine inhibited and aggregated the Ca-ATPase in cardiac SR. Micromolar calcium or 0.5 M lithium chloride protected against lidocaine-induced inhibition, indicating that electrostatic interactions are essential to lidocaine inhibition of the Ca-ATPase. The phospholamban (PLB) antibody 2D12, which mimics PLB phosphorylation, had no effect on lidocaine inhibition of the Ca-ATPase in cardiac SR. Inhibition and aggregation of the Ca-ATPase in cardiac SR occurred at lower concentrations of lidocaine than necessary to inhibit and aggregate the Ca-ATPase in skeletal SR, suggesting that the cardiac isoform of the enzyme has a higher affinity for lidocaine. Halothane inhibited and aggregated the Ca-ATPase in cardiac SR. Both inhibition and aggregation of the Ca-ATPase by halothane were much greater in the presence of PLB antibody or when PLB was phosphorylated, indicating a protective effect of PLB on halothane-induced inhibition and aggregation. The effects of halothane on cardiac SR are opposite from the effects of halothane observed in skeletal SR, where halothane activates and dissociates the Ca-ATPase. These results underscore the crucial role of protein-protein interactions on Ca-ATPase regulation and anesthetic perturbation of cardiac SR.

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Selected References

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