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Agonist-independent modulation of N-type calcium channels by ORL1 receptors

Abstract

We have investigated modulation of voltage-gated calcium channels by nociceptin (ORL1) receptors. In rat DRG neurons and in tsA-201 cells, nociceptin mediated a pronounced inhibition of N-type calcium channels, whereas other calcium channel subtypes were unaffected. In tsA-201 cells, expression of N-type channels with human ORL1 resulted in a voltage-dependent G-protein inhibition of the channel that occurred in the absence of nociceptin, the ORL1 receptor agonist. Consistent with this observation, native N-type channels of small nociceptive dorsal root ganglion (DRG) neurons also had tonic inhibition by G proteins. Biochemical characterization showed the existence of an N-type calcium channel–ORL1 receptor signaling complex, which efficiently exposes N-type channels to constitutive ORL1 receptor activity. Calcium channel activity is thus regulated by changes in ORL1 receptor expression, which provides a possible molecular mechanism for the development of tolerance to opioid receptor agonists.

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Figure 1: Nociceptin inhibition of DRG calcium currents.
Figure 2: Nociceptin inhibition of cloned calcium channels.
Figure 3: ORL1 modulation of N-type calcium channels in the presence and absence of nociceptin is dependent on receptor expression.
Figure 4: Biochemical interactions between ORL1 receptors or N-type channels.
Figure 5: Determinants of ORL1 receptor modulation of N-type calcium channels expressed in tsA-201 cells.
Figure 6: Agonist-independent inhibition of native non-L-type channels of acutely dissociated DRG neurons.

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Acknowledgements

This work was supported by an operating grant to G.W.Z. from the Canadian Institutes of Health Research (CIHR). G.W.Z. is a CIHR Investigator and an Alberta Heritage Foundation for Medical Research (AHFMR) senior scholar. A.M.B. held studentship awards from AHFMR and the Natural Sciences and Engineering Research Council. C.J.D. is the recipient of an AHFMR studentship, C.A. holds postdoctoral fellowships from the AHFMR and the Heart and Stroke Foundation of Canada. E.B. is supported by the IUD foundation and the PICS program of the CNRS.

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Correspondence to Gerald W Zamponi.

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Beedle, A., McRory, J., Poirot, O. et al. Agonist-independent modulation of N-type calcium channels by ORL1 receptors. Nat Neurosci 7, 118–125 (2004). https://doi.org/10.1038/nn1180

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