Cannabidiol in the dorsal hippocampus attenuates emotional and cognitive impairments related to neuropathic pain: The role of prelimbic neocortex-hippocampal connections

Autor(es)

Medeiros, Ana Carolina ; Medeiros, Priscila ; Pigatto, Glauce Regina ; Maione, Sabatino ; Coimbra, Norberto Cysne ; Freitas, Renato Leonardo de

• Tipo de documento: Artigo Científico
• Fonte: PROGRESS IN NEURO-PSYCHOPHARMACOLOGY & BIOLOGICAL PSYCHIATRY; v. 134, p. 16-pg., 2024-06-08.

Resumo

Background and purpose: Chronic neuropathic pain (NP) is commonly associated with cognitive and emotional impairments. Cannabidiol (CBD) presents a broad spectrum of action with a potential analgesic effect. This work investigates the CBD effect on comorbidity between chronic NP, depression, and memory impairment. Experimental approach: The connection between the neocortex and the hippocampus was investigated with biotinylated dextran amine (BDA) deposits in the prelimbic cortex (PrL). Wistar rats were submitted to chronic constriction injury (CCI) of the sciatic nerve and CA1 treatment with CBD (15, 30, 60 nmol). Key results: BDA-labeled perikarya and terminal buttons were found in CA1 and dentate gyrus. CCI-induced mechanical and cold allodynia increased c-Fos protein expression in the PrL and CA1. The number of astrocytes in PrL and CA1 increased, and the number of neuroblasts decreased in CA1. Animals submitted to CCI procedure showed increasing depressive-like behaviors, such as memory impairment. CBD (60 nmol) treatment decreased mechanical and cold allodynia, attenuated depressive-associated behaviors, and improved memory performance. Cobalt chloride (CoCl2: 1 nM), WAY-100635 (0.37 nmol), and AM251 (100 nmol) intra-PrL reversed the effect of CA1 treatment with CBD (60 nmol) on nociceptive, cognitive, and depressive behaviors. Conclusion: CBD represents a promising therapeutic perspective in the pharmacological treatment of chronic NP and associated comorbidities such as depression and memory impairments. The CBD effects possibly recruit the CA1-PrL pathway, inducing neuroplasticity. CBD acute treatment into the CA1 produces functional and molecular morphological improvements. (AU)

• Processo FAPESP: 12/25167-2 - Estudo do Envolvimento dos Circuitos Glutamatérgicos, Endocanabinoides e Endovaniloides do Córtex Pré-frontal Medial no Modelo de Dor Neuropática: Investigação das Comorbidades Dor Crônica e Pânico
• Beneficiário: Priscila Medeiros de Freitas
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/07902-2 - Participação dos circuitos glutamatérgicos, endocanabinoides e endovaniloides do córtex pré-frontal medial no modelo de dor neuropática e da investigação das comorbidades dor crônica e outras desordens neurológicas
• Beneficiário: Renato Leonardo de Freitas
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores
• Processo FAPESP: 14/11869-0 - EMU concedido no processo 2013/12916-0: aparelho para a neuroestimulação DBS (Thomas mini matrix system - Thomas recording GmbH® - winchester Strasse - Giessen - Germany)
• Beneficiário: Renato Leonardo de Freitas
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 13/12916-0 - Participação dos circuitos endocanabinóides, glutamatérgicos e endovanilóides do córtex pré-frontal medial no modelo de dor neuropática e da investigação das comorbidades dor crônica e outras desordens neurológicas
• Beneficiário: Renato Leonardo de Freitas
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 17/13560-5 - Efeito da estimulação cerebral profunda (DBS) e do tratamento com canabidiol no núcleo Subtalâmico sobre a modulação dos sintomas motores e não-motores em um modelo experimental de Doença de Parkinson
• Beneficiário: Priscila Medeiros de Freitas
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado