Pleurisia e edema de pulmão induzidos por palications

AUTOR(ES)

Aurora Santana de Caticha

DATA DE PUBLICAÇÃO

1990

RESUMO

The surface of endothelial cells is covered by negatively charged microdomains. The presence of cationic substances, for example polycations, in contact with rat skin, peritoneum and paw initiates an inflammatory process characterized by the infiltration of leukocytes and an increase in local permeability. In this work, the effect ofpolycations (poly-L-arginine and poly-L-lysine) was studied in two surfaces with distinct physiological and morphological characteristics: the pleura and the alveolus. For this purpose, a model of pleurisy and a model utilizing the intratracheal administration of polycations were used. Polycations were capable of inducing pleurisy and pulmonary edema. The intratracheal administration of these compounds, in the same dose used via the pleural route, resulted in a high mortality: The inflammatory response to these compounds depends on the site of application. Histamine and 5-HT depletion reduced the volume of exudate produced in animals subjected to pleurisy, but did not reduce the mortality in animals which received polycations intratracheally. Neutralization of the polycation charge, through the use of anionic compounds (heparin and dermatan sulfate) markedly reduced the volume of pleural exudate and completely abolished the lethal effect of polycations administered intratracheally. These results suggest that the pleural and alveolar surfaces possess negatively charged microdomains which may be neutralized during the inflammatory process. This hypothesis suggests that anionic compounds may offer a new therapeutic approach to the treatment of inflammation.

ASSUNTO(S)

pleurisia farmacologia edema pulmonar

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