Brazilian Journal of Anesthesiology
https://bjan-sba.org/article/doi/10.1590/S0034-70942010000300008
Brazilian Journal of Anesthesiology
Scientific Article

Influência da naloxona e metisergida sobre o efeito analgésico do laser em baixa intensidade em modelo experimental de dor

Influence of naloxone and methysergide on the analgesic effects of low-level laser in an experimental pain model

André Peres e Serra; Hazem A Ashmawi

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Resumo

JUSTIFICATIVA E OBJETIVOS: A fototerapia com laser (LPT) é um método analgésico promissor, embora seu mecanismo de ação não seja totalmente conhecido. O objetivo deste estudo foi avaliar se a ação da LPT é dependente da ativação de receptores opioides ou serotoninérgicos periféricos. MÉTODO: Foram utilizados ratos Wistar machos. A dor produzida foi de caráter inflamatório, através da injeção de carragenina na pata posterior esquerda dos ratos. O laser utilizado foi o Photon Lase III em meio ativo InGaAIP (660 nm), fluência de 2,5 J.cm-2. Analisou-se a hiperalgesia mecânica utilizando filamentos de von Frey. Os animais foram separados em cinco grupos: Carragenina; Laser (LPT); Luz não coerente; LPT + Naloxona e LPT + Metisergida. RESULTADOS: A fototerapia com laser em baixa intensidade mostrou-se um método analgésico eficaz, enquanto o emprego de fonte de luz não coerente não mostrou ter efeito analgésico. O uso de naloxona bloqueou o efeito analgésico do LPT; já o uso de metisergida não afetou a analgesia do LPT. CONCLUSÕES: A LPT nos parâmetros utilizados apresentou efeito analgésico. A analgesia da LPT é mediada por receptores opioides periféricos. A LPT parece não interagir com receptores serotoninérgicos periféricos.

Palavras-chave

ANALGESIA, ANIMAIS

Abstract

BACKGROUND AND OBJECTIVES: Although the mechanism of action of laser phototherapy (LPT) is not known, it is a promising analgesic method. The aim of this study was to evaluate whether the action of LPT depends on the activation of peripheral opioid or serotonergic receptors. METHOD: Inflammatory pain was induced through the injection of carrageenin in the left posterior paw of male Wistar rats. The InGaAIP visible laser diode (660 nm) with fluency of 2.5 J.cm-2 was used. Von Frey filaments were used to analyze mechanical hyperalgesia. Animals were separated into five groups: Carrageenin; Laser (LPT); Non-coherent light; LPT + Naloxone; and LPT + Methysergide. RESULTS: Low-Level Laser phototherapy proved to be an effective analgesic method, while non-coherent light did not show a similar effect. The use of naloxone blocked the analgesic effect of LPT, while methysergide did not affect LPT-induced analgesia. CONCLUSIONS: According to the parameter used in this study, LPT produced analgesia. Analgesia induced by laser phototherapy is mediated by peripheral opioid receptors. Laser phototherapy does not seem to interact with peripheral serotonergic receptors.

Keywords

ANALGESIA, ANIMALS

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