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Effect of carticaine on the sarcoplasmic reticulum Ca2+-adenosine triphosphatase. II. Cations dependence

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Abstract

Ca2+-ATPase is a major intrinsic protein in the sarcoplasmic reticulum (SR) from skeletal muscles. It actively transports Ca2+ from the cytoplasm to the SR lumen, reducing cytoplasmic [Ca2+] to promote muscle relaxation. Carticaine is a local anesthetic widely used in operative dentistry. We previously showed that carticaine inhibits SR Ca2+-ATPase activity and the coupled Ca2+ uptake by isolated SR vesicles, and increases the rate of Ca2+ efflux from preloaded vesicles. We also found that these effects were antagonized by divalent cations, and concluded that they were mainly due to the direct interaction of carticaine with the Ca2+-ATPase protein. Here we present additional results on the modulation of the above effects of carticaine by Ca2+ and Mg2+. The activating effect of Ca2+ on the ATPase activity is competitively inhibited by carticaine, indicating a decreased Ca2+ binding to the high affinity Ca2+ transport sites. The activating effect of Mg2+ on the phosphorylation of Ca2+-ATPase by orthophosphate is also inhibited by carticaine. The anesthetic does not affect the reaction mechanism of the cations acting as cofactors of ATP in the catalytic site. On the basis of the present and our previous results, we propose a model that describes the effect of carticaine on the Ca2+-ATPase cycle.

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Abbreviations

SR:

Sarcoplasmic reticulum

Ca-ATPase:

Calcium dependent adenosine triphosphatase

MOPS:

3-[N-morpholino]propane-sulfonic acid

MES:

2-[N-Morpholino]ethanesulfonic acid

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Acknowledgements

This work was supported by grants from the Universidad de Buenos Aires, and from the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina. We are grateful to Penta Farmaceútica S.A. (Buenos Aires) and Microsules Bernabó S.A. for supplying pure carticaine chlorhydrate.

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Correspondence to Delia Takara.

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Drs. Guillermo L. Alonso and Patricia Bonazzola are established investigators of the Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina

The experiments were performed in accordance with the current laws of our country

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Takara, D., Sánchez, G.A., Toma, A.F. et al. Effect of carticaine on the sarcoplasmic reticulum Ca2+-adenosine triphosphatase. II. Cations dependence. Naunyn Schmied Arch Pharmacol 371, 375–382 (2005). https://doi.org/10.1007/s00210-005-1061-7

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  • DOI: https://doi.org/10.1007/s00210-005-1061-7

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