Análise da ligação da cetamina às proteínas plasmáticas totais de gatos domésticos

Autores

DOI:

https://doi.org/10.11606/issn.1678-4456.bjvras.2024.219363

Palavras-chave:

Desenvolvimento de fármacos, Analgesia, Felis catus, Albumina

Resumo

A cetamina é um medicamento versátil amplamente utilizado nos ambientes clínico e hospitalar veterinário. A avaliação dos parâmetros de ligação da cetamina às proteínas plasmáticas totais de gatos domésticos fornece informações necessárias na determinação do parâmetro farmacocinético denominado volume de distribuição, o qual é utilizado para a prospecção de concentrações do medicamento em estudos clínicos. O objetivo deste trabalho foi avaliar a taxa de ligação da cetamina às proteínas plasmáticas totais, sua constante (Kb), e modo de ligação à albumina sérica em gatos. Após a aprovação do projeto pelo CEUA/UEM (protocolo 3292020621), uma mistura de plasma de seis animais (n=6) foi reforçada com concentrações de cetamina visando ultrafiltração com membrana de 10 kDa. Os níveis do fármaco antes e depois da ultrafiltração foram analisados pela técnica de Cromatografia Líquida acoplada a Espectrometria de Massas (LC-MS/MS) e os resultados utilizados para calcular a taxa de ligação e a constante de ligação à albumina pelo gráfico de Scatchard. Simulações de docking identificaram os mais prováveis sítios de ligação à proteína. A taxa de ligação da cetamina foi de 65% quando o fármaco atingiu concentrações plasmáticas acima de 300 ng.mL-1, e a constante de ligação foi de 2×106 mol.L–1 com coeficiente de Hill (nH) de 2,3. Estes resultados mostram uma boa correlação entre os parâmetros físico-químicos do fármaco com a avaliação estrutural por meio de docking, além de coerência com os valores relatados por outras metodologias. Este trabalho traz informações sobre o comportamento de ligação da cetamina em proteínas plasmáticas de gatos, parâmetro importante para futuras avaliações farmacocinéticas na busca de melhores protocolos para uso clínico deste medicamento na área veterinária.

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2024-08-05

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1.
Motta VPP, Silva FF da, Caruso Ícaro P, Goes PRN de, Taffarel MO, Diniz A, et al. Análise da ligação da cetamina às proteínas plasmáticas totais de gatos domésticos. Braz. J. Vet. Res. Anim. Sci. [Internet]. 5º de agosto de 2024 [citado 21º de novembro de 2024];61:e219363. Disponível em: https://revistas.usp.br/bjvras/article/view/219363