Brazilian Journal of Pain
https://brjp.org.br/article/doi/10.5935/2595-0118.20200002
Brazilian Journal of Pain
Original Article

The influence of the cannabinoid receptor CB1 on the periaqueductal gray in mice treated with photobiomodulation after chronic constriction injury of the sciatic nerve: a placebo-controlled trial

Influência do receptor canabinóide CB1 na substância cinzenta periaquedutal em camundongos tratados por fotobiomodulação após constrição crônica do nervo ciático: ensaio controlado por placebo

Gabriela Xavier Santos; Giovane Galdino de-Souza; Suélen Santos Alves; Gabriela Nagai Ocamoto; Nivaldo Antônio Parizotto; Luciana Maria dos-Reis

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Abstract

BACKGROUND AND OBJECTIVES: Studies have demonstrated that the cannabinoid CB1 receptor is involved in the modulation of pain, mainly by activating the descending pain control pathway. However, the role of photobiomodulation in this process is not well elucidated. Thus, the present study aimed to investigate the involvement of the CB1 receptor in the supraspinal photobiomodulation-induced antinociception.

METHODS: Male albino swiss mice were submitted to chronic constriction injury and treated with photobiomodulation. To evaluate the supraspinal involvement of the CB1 receptor in the photobiomodulation-induced antinociception, the cannabinoid CB1 receptor antagonist AM251 (0.1µg/vol 0.2µL) was injected 5 minutes before the photobiomodulation treatment. The photobiomodulation treatment was performed on the fifth day after the stereotactic surgery and chronic constriction injury at a dose of 50J/cm2 in acute condition. The hot plate and von Frey monofilaments tests were performed to evaluate the thermal and mechanical pain sensitivity, respectively.

RESULTS: The thermal and mechanical nociceptive threshold was higher in mice with chronic constriction injury, injected with saline and treated with photobiomodulation at the dose of 50J/cm2 in both the hot plate (p<0.001) and von Frey (p>0.001) tests. These antinociceptive effects were not detected in mice with chronic constriction injury pre-treated with AM251.

CONCLUSION: The present study suggests that CB1 receptors located in Supraspinal structures, participate in the control of neuropathic pain following photobiomodulation treatment in animals undergoing chronic constriction injury.

Keywords

Cannabinoid, Lasers, Pain, Receptors, Rehabilitation

Resumo

JUSTIFICATIVA E OBJETIVOS: Estudos demonstraram que o receptor canabinóide CB1 está envolvido na modulação da dor, principalmente pela ativação da via descendente de controle da dor, porém o papel da fotobiomodulação nesse processo não é bem elucidado. Assim, o presente estudo teve como objetivo investigar o envolvimento do receptor CB1 na antinocicepção induzida pela fotobiomodulação a nível supraespinhal.

MÉTODOS: Camundongos machos suíço albinos foram submetidos à lesão por constrição crônica e tratados com fotobiomodulação. Para avaliar o envolvimento supraespinhal do receptor CB1 na antinocicepção induzida por fotobiomodulação foi injetado o antagonista do receptor canabinóide CB1, AM251 (0,1µg/vol 0,2µL) 5 minutos antes do tratamento com fotobiomodulação. O tratamento de fotobiomodulação foi realizado no quinto dia após cirurgia estereotática e lesão por constrição crônica, na dose de 50J/cm2 em estado agudo. Os testes de placa quente e monofilamentos de von Frey foram realizados para avaliar a sensibilidade térmica e mecânica à dor, respectivamente.

RESULTADOS: O limiar térmico e mecânico nociceptivo foi maior nos camundongos com lesão por constrição crônica, injetados com solução salina e tratados com fotobiomodulação na dose de 50J/cm2 nos testes de placa quente (p<0,001) e von Frey (p>0,001). Esses efeitos antinociceptivos não foram detectados em camundongos com lesão por constrição crônica tratados com AM251.

CONCLUSÃO: O presente estudo sugere que os receptores CB1 localizados nas estruturas supraespinhais participam do controle da dor neuropática, após tratamento com fotobiomodulação em animais submetidos à lesão por constrição crônica.

Palavras-chave

Canabinóide, Dor, Lasers, Reabilitação, Receptores

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Submitted date:
09/18/2018

Accepted date:
12/09/2019

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