Short ReportSpinal cannabinoid CB1 or CB2 receptors activation attenuates mechanical allodynia in streptozotocin-induced diabetic ratsGonçalves, Maryna Rodrigues,*; da Conceição, Milena Santana,*; Jesus, Carlos Henrique Alves,*; Gasparin, Aléxia Thamara; Rosa, Evelize Stacoviaki; da Cunha, Joice Maria Author Information Department of Pharmacology, Biological Science Sector, Federal University of Parana, Curitiba, Parana, Brazil *Maryna Rodrigues Gonçalves, Milena Santana da Conceição and Carlos Henrique Alves Jesus contributed equally to the writing of this article. Received 8 April 2020 Accepted as revised 16 June 2020 Correspondence to Joice Maria da Cunha, PhD, Laboratory of Pharmacology of Pain, Department of Pharmacology, Biological Science Building, Federal University of Parana, P.O. Box 19031, Curitiba, Parana, Brazil, ZIP code: 81540-990., Tel.: +55 41 3361 1720; fax: +55 41 3226 2042; e-mail address: [email protected] Behavioural Pharmacology: April 2022 - Volume 33 - Issue 2&3 - p 158-164 doi: 10.1097/FBP.0000000000000580 Buy Metrics Abstract 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. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.