EVALUATION OF SUSCEPTIBILITY OF MOUSE ZYGOTES TO BRUCELLA ABORTUS FOR ESTABLISHMENT OF AN EXPERIMENTAL MODEL FOR PATHOGEN-EMBRYO INTERACTION STUDIES

ABSTRACT

The aim of this study was evaluate in-vitro the susceptibility of mouse zygotes to Brucella abortus, with the purpose of establishing an accessible model for embryo-pathogen interaction studies. The female mice (Swiss Webster) were superovulated and mated with fertile males of the same strain, and then the zygote retrieval was performed. The bacterial suspension was prepared at the moment of inoculation, and the dilution was 10⁶ brucellas/mL. The zygotes were divided into control and infected groups (30 µL of the bacterial suspension); after 24 and 96h their morphology and viability were analyzed. Morphological changes were not observed in the control group, but the infected one presented irregular blastomers, defective cleavage, granular cytoplasm with degenerative-like morphology. The cleavage rates were 77.4% (control) and 59.2% (infected) (χ² de 0.001674; p< 0.05) after 24h, and after 96h 14.5% (control) and 7% (infected) (χ² de 0.141616; p < 0.05). According to the data, mice zygotes are susceptible to B. abortus in-vitro infection. Probably they could be used as an efficient and accessible experimental model for studies of embryo-pathogen interactions.

KEY WORDS
Embryos; animal brucelosis; animal reproduction; animal model