BD-2 and BD-3 Increase Skin Flap Survival in a Model of Ischemia and Pseudomonas Aeruginosa Infection

• Autor(a) principal: Casal, D
• Data de Publicação: 2019
• Outros Autores: Iria, I, Ramalho, JS, Alves, S, Mota-Silva, E, Mascarenhas-Lemos, L, Pontinha, C, Guadalupe-Cabral, M, Ferreira-Silva, J, Ferraz-Oliveira, M, Vassilenko, V, Goyri-O'Neill, J, Pais, D, Videira, P
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10400.17/3265
• topic: CHLC CPR; CHLC PAT CLIN; Animals; Anti-Bacterial Agents / metabolism; Anti-Bacterial Agents / therapeutic use; Disease Models, Animal; Genetic Therapy; Genetic Vectors / therapeutic use; Genetic Vectors / genetics; Graft Survival; Ischemia / complications; Pseudomonas Infections / complications; Male; Pseudomonas Infections / therapy; Pseudomonas aeruginosa / drug effects; Rats; Rats, Wistar; Skin Transplantation / adverse effects; Surgical Flaps / adverse effects; Surgical Flaps / microbiology; Transduction, Genetic; beta-Defensins / genetics; beta-Defensins / therapeutic use

The main aim of this work was to study the usefulness of human β-defensins 2 (BD-2) and 3 (BD-3), which are part of the innate immune system, in the treatment of infected ischemic skin flaps. We investigated the effect of transducing rat ischemic skin flaps with lentiviral vectors encoding human BD-2, BD-3, or both BD-2 and BD-3, to increase flap survival in the context of a P. aeruginosa infection associated with a foreign body. The secondary endpoints assessed were: bacterial counts, and biofilm formation on the surface of the foreign body. A local ischemic environment was created by producing arterialized venous flaps in the left epigastric region of rats. Flaps were intentionally infected by placing underneath them two catheters with 105 CFU of P. aeruginosa before the surgical wounds were hermetically closed. Flap biopsies were performed 3 and 7 days post-operatively, and the specimens submitted to immunohistochemical analysis for BD-2 and BD-3, as well as to bacterial quantification. Subsequently, the catheter segments were analyzed with scanning electron microscopy (SEM). Flaps transduced with BD-2 and BD-3 showed expression of these defensins and presented increased flap survival. Rats transduced with BD-3 presented a net reduction in the number of P. aeruginosa on the surface of the foreign body and lesser biofilm formation.