3,3′-O-dimethylquercetin: A bi-functional vasodilator isolated from green propolis of the Caatinga Mimosa tenuiflora

Autor(es)

Son, Ninh The ; Gianibbi, Beatrice ; Panti, Alice ; Spiga, Ottavia ; Bastos, Jairo Kenupp ; Fusi, Fabio

• Tipo de documento: Artigo Científico
• Fonte: European Journal of Pharmacology; v. 967, p. 13-pg., 2024-02-17.

Resumo

In the search for novel, bi-functional compounds acting as CaV1.2 channel blockers and K+ channel stimulators, which represent an effective therapy for hypertension, 3,3 '-O-dimethylquercetin was isolated for the first time from Brazilian Caatinga green propolis. Its effects were investigated through electrophysiological, functional, and computational approaches. In rat tail artery myocytes, 3,3 '-O-dimethylquercetin blocked Ba2+ currents through CaV1.2 channels (IBa1.2) in a concentration-dependent manner, with the inhibition being reversed upon washout. The compound also shifted the voltage dependence of the steady-state inactivation curve to more negative potentials without affecting the slope of the inactivation and activation curves. Furthermore, the flavonoid stimulated KCa1.1 channel currents (IKCa1.1). In silico simulations provided additional evidence for the binding of 3,3 '- O-dimethylquercetin to KCa1.1 and CaV1.2 channels and elucidated its mechanism of action. In depolarized rat tail artery rings, the flavonoid induced a concentration-dependent relaxation. Moreover, in rat aorta rings its antispasmodic effect was inversely related to the transmembrane K+ gradient. In conclusion, 3,3 '-O-dime- thylquercetin demonstrates effective in vitro vasodilatory properties, encouraging the exploration of its scaffold to develop novel derivatives for potential use in the treatment of hypertension. (AU)

• Processo FAPESP: 21/01411-0 - Estudo químico da própolis da Caatinga produzida por Apis mellifera e reisolamento de compostos da própolis vermelha para realização de ensaios biológicos e desenvolvimento de métodos analíticos
• Beneficiário: Ninh The Son
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/04138-8 - Realização de estudos químicos, analíticos, biológicos, farmacológicos e tecnológicos para preenchimento das lacunas no desenvolvimento do setor de própolis brasileiro
• Beneficiário: Jairo Kenupp Bastos
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/08386-6 - Estudo fitoquímico, desenvolvimento de método analítico e avaliação biológica da própolis marrom produzida por Apis mellifera a partir de Morus alba
• Beneficiário: Victor Pena Ribeiro
• Modalidade de apoio: Bolsas no Brasil - Doutorado