Avaliação da eficacia de diferentes compostos nos modelos in vitro e in vivo da leishmaniose sob diferentes condições de oxigenio / Efficacy of different compounds in leishmaniasis in vitro and in vivo models under different oxygen tensions

AUTOR(ES)

Diana Copi Ayres

DATA DE PUBLICAÇÃO

2007

RESUMO

L. amazonensis, a species transmitted mainly in the Amazon region, which is associated with localized cutaneous lesions and chemotherapy remains the mainstay for the control of leishmaniasis, as effective vaccines have yet to be developed. In this context, there is an intense search for potential new synthetic compounds and natural products for the treatment of leishmaniasis that avoids exposure to potentially toxic drugs. Propolis is a resinous substance that honey bees collect from different plant exsudates. It posses versatile valuable pharmacological activities and has, to date, been taken in internal and external dosage forms for the treatments of various diseases. In this work we evaluated the leishmanicidal activity of Amphotericin-B, Glucantime, Miltefosine and the immunostimulatory Propinobacterium acnes (P. acnes) e Polyinosinic-Polyribocytidylic acid (Poly IC) in vitro under hypoxic (6% O2) and of Glucantime, propolis and P. Acnes in vivo under hyperoxic conditions (100% O2 at a pressure of 2.5 ATA). First, we describe the effect of Amphotericin-B, Glucantime, Miltefosine and the immunostimulatory P. Acnes and Poly IC under normoxic and hypoxic conditions. Under hypoxic condition all compounds were less efective in L. amazonensis infected peritoneal macrophages. We also evaluated the role of different treatment in a in vivo model of rump infection, with leishmaniasis. We describe the effects of ethanolic extract of typified Brazilian red propolis sample, red propolis and papain gel, Glucantime and the imunomodulator P. acnes with or with out the HBO terapy. For this reason, we have performed a longitudinal analysis in the expanding lesions of the susceptible BALB/c mouse. BALB/c mice treated with Glucantime, a combinated therapy of Glucantime and HBO or Glucantime and propolis gel showed significant delay in lesion development and reduction in lesion parasite burdens compared with control mice. Significant differences in the tissue pathology between red propolis and papain gel, Glucantime and P. acnes with or without the HBO terapy and untreated mice were observed by the end of treatments. Finally, we investigated the citokyne production by BALB/c mouse infected with L. amazonensis and treated with propolis gel, Glucantime and HBO terapy. Propolis gel was the only treatment that increases the INF-productin. We do not observe IL-4 production in the tested groups.

ASSUNTO(S)

hipoxia celular leishmania leishmania propole propolis quimioterapia chemotherapy hyperbaric oxigenation cellular hipoxy oxigenação hiperbarica

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