Estudo dos efeitos celulares e vasculares da criocirurgia com nitrogênio líquido, na pele de ratos, por método histopatológico / The study of cellular and vascular effects of cryosurgery with liquid nitrogen, in rat skin, using the histopathological method

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

06/12/2011

RESUMO

Cryosurgery is a very efficient therapeutic technique to treat benign and malignant cutaneous diseases. The primary active mechanism of cryosurgery is related to vascular effects in treated tissue. After a cryosurgical procedure, exuberant granulation tissue is formed at the injection site, probably as a result of angiogenic stimulation of the cryogen and inflammatory response, particularly in endothelial cells. The objective of this study is to evaluate the angiogenic effects of freezing, as part of the phenomenon of healing rat skin subjected to previous injury. Methods: 20 young adult Lewis strain male rats were used, weighing between 180 and 220 grams. Each rat received two wounds that were administered 2 cm apart using a 5mm punch. After 3 days, cryosurgery with liquid nitrogen for 15 seconds, using the open spray technique, was done in one of them. These rats were divided randomly into two groups of 10 animals, group I (GI) and group II (GII). After 7 days (GI) and 14 days (GII), samples were collected cut and stained to realize histopathological examination, to assess the local angiogenesis in differents moments and situations. Results: It was possible to demonstrate that cryosurgery, in spite of promoting cell death and accentuated local inflammation soon after its application, induces a more rapid cell proliferation in the affected tissue and maintenance of this rate in a second phase, than in tissue healing without this procedure. Conclusion: These findings, together with the knowledge that there is a direct relationship between mononuclear cells and neovascularization (the development of a rich system of new vessels in injury caused by cold), suggest that cryosurgery possesses angiogenic stimulus, even if taking longer for complete healing to occur.

ASSUNTO(S)

criocirurgia Úlcera cutânea cicatrização neovascularização cryosurgery skin ulcer healing neovascularization

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