Pharmacological properties and identification of cardiotonic principles from the Indian snuff, Maquira sclerophylla, Ducke

Pharmacological properties and identification of cardiotonic principles from the Indian snuff, Maquira sclerophylla, Ducke

Autor deCarvalho, J. E. Google Scholar
Souccar, C. Google Scholar
Tersariol, I. L. Google Scholar
Torres, L. B. Google Scholar
Lapa, A. J. Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Universidade Estadual de Campinas (UNICAMP)
UNIV FED MARANHAO
Resumo The powdered bark obtained from Maquira sclerophylla Ducke is a snuff used by Amazonian natives. Pharmacological studies on rodents, guinea-pigs, rabbits and dogs revealed cardiovascular changes as the major effects produced by the polar phase of the bark ethanol extract, Oriented by this pharmacological activity a cardenolide fraction was chemically purified from the crude extract. Both crude extract and the purified fraction produced a positive inotropic effect in isolated heart preparations from guinea-pigs and rabbits, and inhibited the Na+, K+-ATPase activity of the enzyme isolated from bovine ventricles. the fraction yielded two major purified cardenolides identified as Maquiroside A (C30H46O8) and Cymarin (C30H44O9). Simultaneous intracellular recordings of the resting membrane potential (RMP) and miniature endplate potentials in rat diaphragm muscle fibres showed that the effect of the purified fraction predominated on the motor nerve terminals enhancing the spontaneous transmitter release, without major changes of RMP values. Comparatively, the effect of ouabain prevailed on the muscle fibre membrane. Considering that both effects depend on the Na+, K+-ATPase activity, the results indicated that the compounds derived from Maquira exert differential actions on this enzyme in the nerve and muscle membrane. These observations may explain the use of this toxic snuff in native festivities. (C) 1997 by John Wiley & Sons, Ltd.
Palavra-chave Maquira sclerophylla Ducke
medicinal plant
cardenolides
dart poison
Indian snuff
Na+, K+-ATPase activity
Idioma Inglês
Data de publicação 1997-03-01
Publicado em Phytotherapy Research. W Sussex: John Wiley & Sons Ltd, v. 11, n. 2, p. 136-141, 1997.
ISSN 0951-418X (Sherpa/Romeo, fator de impacto)
Publicador Wiley-Blackwell
Extensão 136-141
Fonte http://dx.doi.org/10.1002/(SICI)1099-1573(199703)11:2<136
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:A1997WT25800010
Endereço permanente http://repositorio.unifesp.br/handle/11600/25698

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