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Master's Dissertation
DOI
https://doi.org/10.11606/D.60.2003.tde-17072023-103342
Document
Author
Full name
Fabio Kiss Ticli
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2003
Supervisor
Committee
Vilela, Suely (President)
Pereira, Paulo Sérgio
Soares, Andreimar Martins
Title in Portuguese
Propriedades antiofídicas do ácido rosmarínico isolado do extrato vegetal de Cordia verbenacea sobre as ações tóxicas e farmacológicas do veneno de Bothrops jararacussu e suas fosfolipases A2 miotóxicas
Keywords in Portuguese
Ácido rosmarínico
Bothrops jararacussu
Cordia verbenacea
Abstract in Portuguese
Os venenos de serpentes do gênero Bothrops se caracterizam por induzir miotoxicidade, edema, coagulação, hemorragia e atividade fosfolipásica. O veneno da serpente Bothrops jararacussu (VBj) é conhecido pela sua alta atividade miotóxica e edematogênica e suas principais miotoxinas BthTX-l e II induzem necrose muscular, edema, lise de lipossomas e citotoxicidade. A busca de tratamentos alternativos contra os envenenamentos ofídicos tem frequentemente induzido pesquisas científicas com animais resistentes e extratos vegetais. A espécie vegetal Cordia verbenacea, popularmente conhecida como baleeira, é utilizada pela população como cicatrizante e antiinflamatória. O extrato metanólico (EM) desta espécie inibiu significativamente o edema de pata provocado pelas BthTX-l e II. O EM foi fracionado em Sephadex LH-20, sendo a fração 3 aplicada em CLAE permitindo o isolamento do ácido rosmarínico (AR). A estrutura molecular foi determinada por métodos espectrofotométricos como: RMN 1H, RMN 13C, IV, COSY, HMQC e HMBC. O AR não inibiu significativamente as atividades coagulante e anticoagulante realizadas in vitro, mas mostrou ser bastante eficaz para inibição do edema e miotoxicidade induzida pelas BthTX-l e II, mas não foi tão eficiente para inibir a necrose induzida pelo veneno bruto de B. jararacussu. A hemorragia provocada pelo VBj foi inibida pelo AR em doses elevadas (30 e 50 mg), demonstrando a especificidade deste princípio ativo na inibição de fosfolipases A2 básicas (BthTX-l e II).
Title in English
Antiophidic properties of rosmarinic acid isolated from the plant extract of Cordia verbenacea on the toxic and pharmacological actions of Bothrops jararacussu venom and its myotoxic A2 phospholipases
Keywords in English
Bothrops jararacussu
Cordia verbenacea
Rosmarinic acid
Abstract in English
The Bothrops snake venoms are characterized by the propensity to induce diverse physiopathological effects such as: miotoxicity, edema, coagulation, hemorrhaging, and phospholipasic activities. The Bothrops jararacussu venom is known for its high miotoxic and edematogenic activity. The mainly miotoxins (BthTX-l e II) this venom induce muscular necrosis, edema, smoothing of liposome and citotoxicity. The search for alternative treatments against snake poisonings has frequently led to scientific research with resistant animais and vegetable extracts. The vegetable species Cordia verbenacea, commonly known as "baleera", is used by the population as a scar-former and anti-inflammatory. The methanolic extract (ME) significantly inhibited paw edema provoked by toxins BthTX-l and II. The ME went fractionize in Sephadex LH-20 and the number 3 fraction was applied in HPLC, isolating the rosmarinic acid (RAT The molecular structure was detremined by spectrophotometric methods: NMR 1H, NMR 13C, IV, COSY, HMQC and HMBC. The RA proved to be fairly effective in inhibiting edema and miotoxicity induced by BthTX-l and II, but was not as efficient in inhibiting necrosis, coagulating and anti-coagulating induced by Bothrops jararacussu crude venom and BthTX-IL RA in elevated doses inhibited hemorrhage produced by this venom. This effect demonstrated the specificity of this active potion in inhibiting basic phospholipases A2 (BthTX-l and II).
 
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Publishing Date
2023-07-17
 
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