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PURPOSE: The infection is one of the main factors that affect the physiological evolution of the surgical wounds. The aim of this work is to evaluate the effects of fibroblast growth factor (FGFâ) and anti-FGFâ in the healing, synthesis and maturation of collagen when topically used on infected skin wounds of rats. METHODS: An experimental study was perfomed in 60 male Wistar rats. All animals were divided in two groups (A and B). Each group was divided in three subgroups A1, B1; A2, B2 and A3, B3. After anesthesia with pentobarbital, two open squared wounds (1cm²), 4cm distant to each other, were done in the dorsal skin of all the rats. In group A (n=30) the wounds were contaminated with multibacterial standard solution, and in group B(n=30) the wounds were maintained sterile. These wounds were named F1 (for inflammation analysis) and F2 (for collagen study). The open wounds of A1 and B1 rats were topically treated with saline solution, A2 and B2 were treated with FGFâ and subgroups A3 and B3 were treated with FGFâ and anti-FGFâ. The rats were observed until complete epitelization of F2 wounds for determination of healing time and the expression of types I and III collagen, using Picro Sirius Red staining. Inflammatory reaction in F1 wounds was studied using hematoxilineosin staining. The three variable was measured by the Image Pro-Plus Média Cybernetics software. The statistical analysis was performed by ANOVA and Tukey test, considering p<0.05 as significant. RESULTS: It was observed that infection retarded significantly (p<0.05) the time of wound scarring and the topical application of FCFb reverted the inhibition of healing caused by bacteria. The inflammatory reaction was greater in the subgroup B2 than in B1 and A3, and the difference was significant (p<0.05). It was observed greater expression of type I collagen in all the subgroups treated with FCFb, when compared with the untreated subgroups. Type III collagen was significantly decreased in wounds of B3 rats, comparing to the other subgroups. CONCLUSIONS: The FCFb accelerated the healing of open infected wounds and contributed with maturation of collagen, enhancing the type I collagen density. The anti-FCFb antibody was able to attenuate the production of both type I and III collagen. OBJETIVO: Avaliar os efeitos do fator de crescimento de fibroblastos básico (FCFâ) e do anti-FCFâ na cicatrização e maturação do colágeno em feridas infectadas na pele de ratos. MÉTODOS: Um estudo experimental foi realizado em 60 ratos Wistar, divididos em dois grupos (A e B). Cada grupo foi divididos em 03 subgrupos A1,B1; A2,B2 e A3,B3. Após anestesia com pentobarbital sódico intraperitoneal, foram feitas duas feridas abertas de 1cm² na pele no dorso distando 4cm uma da outra. Essas feridas foram denominadas feridas F1 (para análise inflamatória) e F2 (para estudo do colágeno). No grupo A(n=30), as feridas foram contaminadas com solução multibateriana e no grupo B (n=30) as feridas não foram contaminadas. As feridas receberam tratamento tópico com aplicação única. Nos subgrupos A1 e B1 foram tratadas com solução salina tópica, as dos subgrupos A2 e B2 foram tratadas com o FCFâ e nos subgrupos A3 e B3 foram tratadas com FCFâ e com o anti-FCFâ. Os dados formam analisados pelos testes ANOVA de Tukey, considerando p<0,05 como significante. RESULTADOS: A infecção retardou de modo significante o tempo de cicatrização e a aplicação do FCFâ foi capaz de reverter a inibição da cicatrização provocada pela infecção(p<0.05). A resposta inflamatória foi maior nos grupos tratados com o FCFâ, e a aplicação do anti-FCFâ inibiu a reação inflamatória(p<0.05). Houve aumento significante dos colágenos tipo I e III em todos os subgrupos tratados com FCFâ, comparando com os não tratados, sendo a expressão do tipo I mais intensa do que do tipo III (p<0.05). A aplicação do anti-FCFâ inibiu a expressão das moléculas do colágeno. CONCLUSÕES: O FCFâ foi capaz de acelerar a cicatrização de feridas abertas infectadas e contribui para a maturação do colágeno, ao aumentar a expressão do colágeno tipo I, fenômeno que foi atenuado pela ação do anti-FCFâ

Effects of the basic fibroblast growth factor and its anti-factor in the healing and collagen maturation of infected skin wound