Resumo

RIVEROS GONZALEZ, Claudia L. et al. EVALUACIÓN DEL EFECTO INMUNOMODULADOR DEL ÁCIDO ÚSNICO SOBRE LA CAPACIDAD FAGOCÍTICA, ADHERENCIA, QUIMIOTAXIS CELULAR Y CITOTOXICIDAD SOBRE MONOCITOS Y POLIMORFONUCLEARES. Rev. Bol. Quim [online]. 2012, vol.29, n.1, pp.39-54. ISSN 0250-5460.

ABSTRACT This study describes the evaluation of activities cytotoxic and immunomodulating effect of the acid úsnico, secondary metabolite obtained from a lichen, Usnea sp., with a high potential leishmanicidal in vitro (IC₅₀ 10.3 ug/mL) according to research of the I. I. F. B. collected in the locality of: Pazña (Oruro, Bolivia), which is attributed to him a variety of uses in traditional medicine as be antibacterial and antifungal. The cytotoxic activity was evaluated against human cells from peripheral blood (monocytes and polymorphonuclear leukocytes), at concentrations less than or equal to 250 µg/mL, taking that the CC₅₀ of monocytes exposed to acid úsnico per 24 hours was 63.5 µg/mL and at 48 hours was 58.9 µg/ml in relation to the Glucantime that at the same incubation time was 45.3 µg/ml and 38.6 µg/ml for polymorphonuclear cells at 6 hours of exposure showed a CC₅₀ of 58.9 µg/ml and 12 hours a CC₅₀ of 54.3 µg/ml, the Glucantime in the same incubation period showed a CC₅₀ of 43.5 µg/ml and 36.5 µg/ml. On the other hand, the effect inmunomodulador of the sour úsnico specifically on the quimiotaxis, adherence, fagocitosis and the activity total hemolítica of the complement, having that the sour úsnico favors the quimiotaxis from the monocitos to the concentrations of 31,2 and 15,6 µg / mL, it increases the capacity of cellular adherence of the monocitos and polymorphonuclear cells at concentrations greater than 125 µg/ml in general reduces the percentage of cells with capacity to phagocytose at concentrations greater than 15.6 µg/ml and has an effect on the hemolytic activity of the complement system in the range of concentrations ranging between 125 and 15.6 µg/ml was a decrease of 50 % of the hemolytic activity of the complement system. These results provide a basis to suggest that the Acid Úsnico has potential for the development of drugs against Leishmania, which must be validated in future studies in vivo in animal models.

Palavras-chave : immunomodulating effect ¡phagocytic capacity; Adhesion; Chemotaxis| Cytotoxicity; CC₅₀; Usnea spp acid úsnico.

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