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The mu opioid receptor activation does not affect ischemia-induced agonal currents in rat spinal ventral horn

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Abstract

Purpose

Opioid-induced spastic paraplegia after transient spinal cord ischemia during aortic surgery has been reported. Opioids modulate neurotransmission through mu (μ) opioid receptors (MORs) in the spinal ventral horn. However, their effects during ischemic insult are not understood.

Methods

The effects of the selective μ agonist [d-Ala2,-N-Me-Phe4, Gly5-ol]enkephalin (DAMGO) on ischemia-induced agonal currents were examined in the spinal lamina IX neurons of neonatal rats by using the whole-cell patch-clamp technique. Ischemia was simulated in vitro by oxygen/glucose deprivation.

Results

DAMGO (1 μM) produced outward currents in ~60 % of spinal lamina IX neurons at a holding potential of −70 mV. Superfusion with ischemia-simulating medium elicited an agonal current. The latency was 457 ± 18 s. Despite its neuromodulatory effects, DAMGO did not significantly change the latencies of the agonal currents with (440 ± 23 s) or without (454 ± 33 s) DAMGO-induced currents.

Conclusion

Activation of MORs does not influence ongoing ischemia-induced neuronal death. Our findings indicate that MOR agonist administration should be suitable as an anesthetic during aortic surgery.

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Acknowledgments

This research was supported by a Grant-in-Aid for Scientific Research (Grant number 21791438, 24791582) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan, Tokyo, Japan.

Conflict of interest

None.

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Authors and Affiliations

  1. Division of Anesthesiology, Niigata University Graduate School of Medical and Dental Sciences, 1-757 Asahimachi, Chuo Ku, Niigata, 951-8510, Japan

    Hiroyuki Honda, Hiroshi Baba & Tatsuro Kohno

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  1. Hiroyuki Honda
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  2. Hiroshi Baba
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  3. Tatsuro Kohno
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Correspondence to Tatsuro Kohno.

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Honda, H., Baba, H. & Kohno, T. The mu opioid receptor activation does not affect ischemia-induced agonal currents in rat spinal ventral horn. J Anesth 28, 839–845 (2014). https://doi.org/10.1007/s00540-014-1829-3

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  • DOI: https://doi.org/10.1007/s00540-014-1829-3

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