Isolation and Molecular Characterization of Two Novel Lytic Bacteriophages for the Biocontrol of Escherichia coli in Uterine Infections: In Vitro and Ex Vivo Preliminary Studies in Veterinary Medicine

Autor(es)

Balcao, Victor M. ; Belline, Bianca G. ; Silva, Erica C. ; Almeida, Pablo F. F. B. ; Baldo, Denicezar A. ; Amorim, Lara R. P. ; Oliveira Junior, Jose M. ; Vila, Marta M. D. C. ; Del Fiol, Fernando S.

• Tipo de documento: Artigo Científico
• Fonte: PHARMACEUTICS; v. 14, n. 11, p. 40-pg., 2022-11-01.

Resumo

E. coli is one of the etiological agents responsible for pyometra in female dogs, with conventional treatment involving ovariohysterectomy. Here, we report the isolation and full characterization of two novel lytic phages, viz. vB_EcoM_Uniso11 (ph0011) and vB_EcoM_Uniso21 (ph0021). Both phages belong to the order Caudovirales and present myovirus-like morphotypes, with phage ph0011 being classified as Myoviridae genus Asteriusvirus and phage ph0021 being classified as Myoviridae genus Tequatrovirus, based on their complete genome sequences. The 348,288 bp phage ph0011 and 165,222 bp phage ph0021 genomes do not encode toxins, integrases or antimicrobial resistance genes neither depolymerases related sequences. Both phages were shown to be effective against at least twelve E. coli clinical isolates in in vitro antibacterial activity assays. Based on their features, both phages have potential for controlling pyometra infections caused by E. coli. Phage ph0011 (reduction of 4.24 log CFU/mL) was more effective than phage ph0021 (reduction of 1.90 log CFU/mL) after 12 h of incubation at MOI 1000. As a cocktail, the two phages were highly effective in reducing the bacterial load (reduction of 5.57 log CFU/mL) at MOI 100, after 12 h of treatment. Both phages were structurally and functionally stabilized in vaginal egg formulations. (AU)

• Processo FAPESP: 16/12234-4 - TransAppIL - Permeação cutânea de entidades proteicas estabilizadas estruturalmente e funcionalmente, carreadas por líquidos iônicos.
• Beneficiário: Marta Maria Duarte Carvalho Vila
• Modalidade de apoio: Auxílio à Pesquisa - Regular
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• Beneficiário: Pablo Felipe Fazolin de Barros Almeida
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
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• Beneficiário: Vitor Manuel Cardoso Figueiredo Balcão
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 18/05522-9 - PsaPhageKill - isolamento, caracterização e uso de bacteriófagos líticos contra Pseudomonas syringae pv. actinidiae para combater o cancro do kiwi: uma alternativa eficiente e amiga do ambiente
• Beneficiário: Vitor Manuel Cardoso Figueiredo Balcão
• Modalidade de apoio: Bolsas no Exterior - Pesquisa