Influencia das lectinas PHA, de Phaseolus vulgaris, WGA, de germe de trigo e jacalina, de Artocarpus integrifolia, no processo de reparação tecidual da pele de ratos

AUTOR(ES)
DATA DE PUBLICAÇÃO

1998

RESUMO

Wound healing is a complex and dynamic process, characterized by the integrated actions of different cells. Lectins are glycoproteins which can present several biological activities. Many of lectin activities may contribute to repair including increased production of cytokines, and activation of inflammatory cells and fibroblasts. The purpose of this work was to evaluate in vivo effects of PHA (Phaseolus vulgaris phytohemaglutinin), WGA (Triticum vulgare lectin) and jacalin (Artocarpus integrifolia lectin) on wound healing in vivo. Male rats were anesthetized and excisions of 8 mm in diameter were performed in their dorsal skin. The lectins (300uglmL) were then placed Qn the wound. Changes in the surface area were recorded everyday as compared to the initial wound size. The rats were then killed at the 3rd, 7th, 11th, or 15th day. The specimens were harvested for histological examination, and stained with hematoxylin-eosin or silver impregnation. The inflammatory reaction was histologically evaluated around the area of lectin injection. The direct fibroblast proliferation induced by theses lectins were analyzed. PHA accelerated tis sue repair and enhanced the rate of wound contraction when applied to wound sites. Furthermore, PHA increased the reepithelization, collagen deposition and also promoted inflammatory reaction. PHA decreased fibroblast proliferation in vitro. WGA delayed wound repair when applied locally on the wound. WGA promoted weak inflammatory reaction and reduced the granulation tissue maturation. Significant decreased fibroblast proliferation were observed. Jacalin did not have a significant effect on repair and fibroblast proliferation. Jacalin promoted inflammatory Feaction when applied locally. PHA may induce wound healing due to the activation of inflammatory cells. Activated leukocytes release growth factors, such as ILs, INFy and F AFs, which have an important role in the repair processo WGA interact with different glycoproteins, such as plasma fibronectin receptor, and modify the cell and extracellular matrix interaction. Although jacalrn induced the proliferation of human lymphocytes and production of lymphokines, itt did not influence the cicatrization processo

ASSUNTO(S)

cicatrização de feridas lectinas celulas - cultura e meios de cultura inflamação

ACESSO AO ARTIGO

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