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Phentermine induces conditioned rewarding effects via activation of the PI3K/Akt signaling pathway in the nucleus accumbens

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Abstract

Rationale

Phentermine is structurally similar to methamphetamine and is widely used as an anti-obesity drug in the USA and many other countries. The potential for reward of phentermine has been noted; however, the mechanisms of phentermine dependence have not been established.

Objectives

Here, we investigated the rewarding and dopaminergic behavioral responses to phentermine in mice and found that phentermine produced conditioned rewarding effects through the phosphoinositide 3-kinase (PI3K)/Akt signaling pathway in the nucleus accumbens (NAc).

Methods

The impact of phentermine was assessed using conditioned place preference (CPP) test, climbing behavior test, and western blot analysis.

Results

Phentermine 1 and 3 mg/kg (i.p.) significantly increased CPP. Phentermine, a known dopamine releaser, boosted apomorphine-induced climbing behavior in mice, and methamphetamine (i.p.) also increased apomorphine-induced dopaminergic behavior. Phentermine and methamphetamine increased the level of expression of the dopamine transporter (DAT) and phospho-Akt proteins to a similar degree in the NAc of CPP mice. To determine whether the conditioned rewarding effects of phentermine were mediated through the PI3K/Akt pathway, we assessed the effects of the Akt inhibitor LY294002 on phentermine-induced place preference and climbing behavior. LY294002 (1 and 3 μg/site, i.c.v.) reduced phentermine-induced CPP and phentermine-increased climbing behavior. However, LY294002 did not change CPP and climbing behavior itself and also did not decrease apomorphine-induced climbing behavior in mice. Further, LY294002 decreased the phentermine-increased levels of DAT protein and phosphorylation of Akt in the NAc of CPP mice.

Conclusions

Thus, these findings suggest that phentermine induces conditioned rewarding effects via activation of the PI3K/Akt signaling pathway in the NAc.

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Acknowledgments

This research was supported by grants (14182MFDS979) from the Ministry of Food and Drug Safety. This work was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2013R1A1A2062362) and (NRF-2013R1A6A3A01027711).

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    Authors and Affiliations

    1. Department of Pharmacology, School of Pharmacy, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, 440-746, Republic of Korea

      Sa-Ik Hong, Min-Jung Kim, In-Jee You, Seung-Hwan Kwon, Shi-Xun Ma, Ji-Young Hwang, Jee-Yeon Seo, Yong-Hyun Ko, Bo Ram Lee, Seok-Yong Lee & Choon-Gon Jang

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    1. Sa-Ik Hong
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    Correspondence to Choon-Gon Jang.

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    Sa-Ik Hong and Min-Jung Kim contributed equally to this work.

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    Hong, SI., Kim, MJ., You, IJ. et al. Phentermine induces conditioned rewarding effects via activation of the PI3K/Akt signaling pathway in the nucleus accumbens. Psychopharmacology 233, 1405–1413 (2016). https://doi.org/10.1007/s00213-016-4231-z

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    • DOI: https://doi.org/10.1007/s00213-016-4231-z

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