Acupuncture at SI5 attenuates morphine seeking behavior after extinction

This pioneering study investigated the potential of acupuncture to prevent relapse in morphine addiction, a central problem in the treatment of chemical dependence. The research was conducted with rats trained to self-administer morphine for three weeks, developing addictive behavior. After a one-week extinction period, during which morphine was replaced with saline solution, the animals were tested to verify whether they would resume seeking the drug when re-exposed to it.

The experimental design included three main groups: animals that received acupuncture at point SI-5 (Yanggu), at the control point LI-5 (Yangxi), and a control group without treatment. Point SI-5, located on the small intestine meridian, was chosen on the basis of traditional Chinese medicine, which teaches that this point helps calm the mind and the emotions. Acupuncture was applied for only 1 minute, immediately before the morphine injection that induced the relapse.

The results were striking and specific. While animals in the control group showed strong relapse, pressing levers to obtain morphine in 72% of cases, those treated with acupuncture at SI-5 showed a dramatic reduction to only 13% of seeking behavior. Importantly, acupuncture at the control point LI-5 did not produce a significant effect, demonstrating that the result was not due simply to stress or handling, but rather to the specificity of the chosen point.

To better understand how acupuncture works, the researchers investigated the involvement of the GABA system, an important inhibitory neurotransmitter in the brain. When they administered drugs that block GABA receptors before acupuncture, the protective effect disappeared completely. This suggests that acupuncture works, at least in part, through activation of the GABAergic system, which naturally inhibits compulsive behaviors.

This mechanism makes neurobiological sense, as we know that drugs such as morphine alter the brain's reward system, particularly through dopamine release in the nucleus accumbens. The GABA system acts as a natural 'brake' in this circuit, and acupuncture appears to strengthen this control mechanism. Previous studies had already shown that acupuncture can normalize altered dopamine levels caused by morphine, supporting this hypothesis.

The clinical implications are significant. Relapse is one of the greatest challenges in the treatment of chemical dependence, with rates that can reach 90% in some cases. The fact that a simple, non-pharmacological treatment such as acupuncture can drastically reduce drug-seeking behavior offers hope for millions of people in recovery. Acupuncture is already widely used in chemical dependence clinics, but this study provides solid scientific evidence on its mechanisms of action.

However, it is important to recognize the limitations. This was an animal study, and although rodent dependence models are well validated, translation to humans always requires caution. In addition, the study focused only on morphine, and different drugs may respond in different ways. The relatively small group size and the acute nature of the treatment (only one session) also limit the conclusions.

The research aligns with a growing body of evidence on the neurobiological effects of acupuncture. Previous studies had already demonstrated that acupuncture can attenuate withdrawal symptoms, reduce drug sensitization, and modify the expression of addiction-related genes. This work adds an important piece to the puzzle, showing that acupuncture can not only treat acute symptoms but potentially prevent relapse.

The involvement of the GABA system also opens doors to future research. Understanding exactly how acupuncture activates these receptors may lead to the development of more effective protocols. For example, it would be interesting to investigate whether repeated acupuncture sessions could produce more lasting effects, or whether combination with other treatment modalities could enhance the results. This study lays a solid foundation for such future investigations and reinforces the potential of acupuncture as a valuable tool in the therapeutic arsenal against chemical dependence.