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Nucleus accumbens hyperpolarization-activated cyclic nucleotide-gated channels modulate methamphetamine self-administration in rats

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Abstract

Rationale

Methamphetamine addiction is believed to primarily result from increased dopamine release and the inhibition of dopamine uptake. Some evidence suggests that hyperpolarization-activated cyclic nucleotide-gated (HCN) channels play important roles in the functional modulation of dopaminergic neurons and the pathophysiology of related diseases. However, little is known about the effects of HCN channels on methamphetamine addiction.

Objectives

The present study investigated the role of brain HCN channels in methamphetamine addiction.

Results

Acute intracerebroventricular (i.c.v.) injection or bilateral intra-accumbens microinjections of non-selective HCN channel blocker ZD7288 (0.3125 and 0.625 μg) significantly reduced both methamphetamine (0.0125 or 0.05 mg/kg/infusion)-induced self-administration under fixed ratio 2 reinforcement and the breakpoint of methamphetamine (0.05 mg/kg/infusion) under progressive ratio reinforcement in rats. Moreover, compared with i.c.v. injection, bilateral intra-accumbens microinjections of ZD7288 exerted stronger inhibitory effects, suggesting that blockade of HCN channels in the nucleus accumbens reduced the reinforcing effects of and motivation for methamphetamine. We also found that ZD7288 (0.625 and 1.25 μg, i.c.v.) significantly decreased methamphetamine (1 mg/kg, intraperitoneal (i.p.))-induced hyperactivity with no effect on the spontaneous activity in rats. Finally, in vivo microdialysis experiments showed that the HCN channel blockade using ZD7288 (0.625 and 1.25 μg, i.c.v.) decreased methamphetamine (1 mg/kg, i.p.)-induced elevation of extracellular dopamine levels in the nucleus accumbens.

Conclusions

These results indicate that HCN channels in the nucleus accumbens are involved in the reinforcing properties of methamphetamine and highlight the importance of HCN channels in the regulation of dopamine neurotransmission underlying methamphetamine addiction.

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Acknowledgments

This work was supported by the National Basic Research Program of China (No. 2015CB553504), the National Natural Science Foundation of China (No. 81573405, No. 81573404), and the Beijing Nova Program xx2014A014.

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Correspondence to Jin Li.

Ethics declarations

We declare that the experiments comply with the current laws of the country in which they were performed. All animal treatments were performed in strict accordance with the guidelines of the Institutional Review Committee for the use of Animals.

Conflict of interest

The authors declare no conflict of interest.

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Cao, DN., Song, R., Zhang, SZ. et al. Nucleus accumbens hyperpolarization-activated cyclic nucleotide-gated channels modulate methamphetamine self-administration in rats. Psychopharmacology 233, 3017–3029 (2016). https://doi.org/10.1007/s00213-016-4349-z

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  • DOI: https://doi.org/10.1007/s00213-016-4349-z

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