Gonçalves Maryna Rodrigues, da Conceição Milena Santana, Jesus Carlos Henrique Alves, Gasparin Aléxia Thamara, Rosa Evelize Stacoviaki, da Cunha Joice Maria
Department of Pharmacology, Biological Science Sector, Federal University of Parana, Curitiba, Parana, Brazil.
Behav Pharmacol. 2022 Apr 1;33(2&3):158-164. doi: 10.1097/FBP.0000000000000580.
Diabetes is a chronic disease associated with a high number of complications such as peripheral neuropathy, which causes sensorial disturbances and may lead to the development of diabetic neuropathic pain (DNP). The current treatment for DNP is just palliative and the drugs may cause severe adverse effects, leading to discontinuation of treatment. Thus, new therapeutic targets need to be urgently investigated. Studies have shown that cannabinoids have promising effects in the treatment of several pathological conditions, including chronic pain. Thus, we aimed to investigate the acute effect of the intrathecal injection of CB1 or CB2 cannabinoid receptor agonists N-(2-chloroethyl)-5Z, 8Z, 11Z, 14Z-eicosatetraenamide (ACEA) or JWH 133, respectively (10, 30 or 100 μg/rat) on the mechanical allodynia associated with experimental diabetes induced by streptozotocin (60 mg/kg; intraperitoneal) in rats. Cannabinoid receptor antagonists CB1 AM251 or CB2 AM630 (1 mg/kg) were given before treatment with respective agonists to confirm the involvement of cannabinoid CB1 or CB2 receptors. Rats with diabetes exhibited a significant reduction on the paw mechanical threshold 2 weeks after diabetes induction, having the maximum effect observed 4 weeks after the streptozotocin injection. This mechanical allodynia was significantly improved by intrathecal treatment with ACEA or JWH 133 (only at the higher dose of 100 μg). Pre-treatment with AM251 or AM630 significantly reverted the anti-allodynic effect of the ACEA or JWH 133, respectively. Considering the clinical challenge that the treatment of DPN represents, this study showed for the first time, that the intrathecal cannabinoid receptors agonists may represent an alternative for the treatment of DNP.
糖尿病是一种与多种并发症相关的慢性疾病,如周围神经病变,可导致感觉障碍,并可能引发糖尿病性神经病理性疼痛(DNP)。目前DNP的治疗只是姑息性的,且药物可能会引起严重的不良反应,导致治疗中断。因此,迫切需要研究新的治疗靶点。研究表明,大麻素在治疗包括慢性疼痛在内的多种病理状况方面具有潜在效果。因此,我们旨在研究鞘内注射CB1或CB2大麻素受体激动剂N-(2-氯乙基)-5Z, 8Z, 11Z, 14Z-二十碳四烯酰胺(ACEA)或JWH 133(分别为10、30或100μg/大鼠)对链脲佐菌素(60mg/kg;腹腔注射)诱导的实验性糖尿病大鼠相关机械性异常性疼痛的急性影响。在分别用激动剂治疗前给予大麻素受体拮抗剂CB1 AM251或CB2 AM630(1mg/kg),以确认大麻素CB1或CB2受体的参与。糖尿病大鼠在诱导糖尿病2周后爪部机械阈值显著降低,在链脲佐菌素注射后4周观察到最大效应。鞘内注射ACEA或JWH 133(仅在100μg的较高剂量时)可显著改善这种机械性异常性疼痛。用AM251或AM630预处理分别显著逆转了ACEA或JWH 133的抗异常性疼痛作用。考虑到DPN治疗所面临的临床挑战,本研究首次表明,鞘内注射大麻素受体激动剂可能是治疗DNP的一种替代方法。
Pharmacol Biochem Behav. 2013-2-27
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