The Effect of Lupane Triterpenoids (Dipteryx alata Vogel) in the in vitro Neuromuscular Blockade and Myotoxicity of two Snake Venoms

Author(s): Miriele Cristina Ferraz, Luciane Aparecida Celestino Parrilha, Maria Silvia Duarte Moraes, Jorge Amaral Filho, Jose Carlos Cogo, Marcio Galdino dos Santos, Luiz Madaleno Franco, Francisco Carlos Groppo, Pilar Puebla, Arturo San Feliciano, Yoko Oshima-Franco.

Journal Name: Current Organic Chemistry

Volume 16 , Issue 22 , 2012

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Abstract:

Traditional medicine of Brazilian central savannah preconizes Dipteryx alata extracts against snakebites venoms. Previous studies have shown the extract of this plant’s bark antagonizing the neuromuscular blockade caused by snake venom in isolated mice diaphragm and phrenic nerve models. In the present study, the triterpenoids lupeol, lupenone, 28-OH-lupenone and betulin, which are constituents of the plant, were observed by using in vitro pharmacological tests. These tests showed the efficacy of all tested triterpenoids (1 mg/5mL) against the irreversible neuromuscular blockade caused by snake venom from Bothrops jararacussu (Bjssu, 40 μg/mL, n=19), as following: betulin (68 ± 7%, n=11) ~ lupeol (70 ± 8%, n=5) > lupenone (45 ± 9%, n=7) ~ 28-OH-lupenone (54 ± 5%, n=4). Betulin (39.5 ± 9%, n=9) and lupenone (49.5 ± 8%, n=4) significantly protected against Crotalus durissus terrificus (CDT, 10 μg/mL, n=10) envenomation of neuromuscular junction. The mixture of betulin or lupeol + Bjssu venom and betulin or lupenone + CDT venom showed significant phytochemical protection in morphological analysis. Considering both pharmacological and morphological results, betulin showed the best protective effect against neuromuscular blockade and myotoxicity caused by both snake venoms. In addition, it has a potent short-term excitatory action in the neuromuscular junction. We concluded that the studied triterpenoids, especially betulin, showed antiophidian properties.

Keywords: Bothrops jararacussu; Crotalus durissus terrificus; Dipteryx alata Vogel; Lupane triterpenoids; Neuromuscular junction

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Article Details

VOLUME: 16
ISSUE: 22
Year: 2012
Page: [2717 - 2723]
Pages: 7
DOI: 10.2174/138527212804004481
Price: $58

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