Possibility of using exometabolites Bifidobacterium bifidum № 791 in traumatology and orthopedics

• Main Authors: A. A. Markov, T. H. Timokhina, N. B. Perunova, Ya. I. Paromova, E. V. Ivanova
• Format: Article
• Language: Russian
• Published: Central Research Institute for Epidemiology 2019-08-01
• Series: Журнал микробиологии, эпидемиологии и иммунобиологии
• Subjects: b. bifidum 791; biofilms of microorganisms; antibiotic-resistant strains; traumatologic-orthopedic practice; titanium implants
• Online Access: https://microbiol.elpub.ru/jour/article/view/391

Aim. To study the effect of exometabolites  of Bifidobacterium bifidum on the biological properties of causative agents of purulent-septic complications  in trauma and orthopedic  practice and to evaluate their effect on reparative bone tissue regeneration in the peri-implant zone in the postoperative period. Materials and methods. Using the museum cultures of B. bifidum 791, S. aureus 25923 ATCC,  P. aeruginosa 27853 ATCC  and  antibiotic-resistant hospital  strains,  isolated from patients  with periprosthetic  infection  and osteomyelitis (S.aureus 889, S. epidermidis 2041, P. aeruginosa 9672). The supernatant  (exometabolites)  of B. bifidum 791 was obtained from a broth culture, which was centrifuged and passed through a membrane filter. In studying the effect of exometabolites  of bifidobacteria  on the proliferative activity of bacteria, the two-day supernatant  of B. bifidum was co-incubated for 24 cultures of museum  and hospital strains. The biofilm formation  in vitro experiment  was studied after 24 and 96 hours. Treatment  of implants with exometabolites of bifidobacteria was carried out for 30 minutes. Experimental  research was carried out on rabbits of breed «Flandr». Titanium  implants  without  coating (control)  and with porous SBKFM  coating treated with exometabolites  of B. bifidum (experiment) were screwed into the tibial bones of animals. Histological examination  and computed  microtomography were performed  using a SkyScan 1172 instrument (BRUKER). Result. Depending on the time of cultivation of bifidobacteria, the supernatant B. bifidum 791 had a bacteriostatic  and bactericidal effect to varying degrees, and also inhibited the biofilm formation of the studied microorganism cultures, including antibiotic-resistant strains. In in vivo experiments, the use of porous SBKFM coatings on titanium implants treated with the supernatant of bifidobacteria made it possible to maintain the mineral density indices of the peri-implantation zone at a high level in comparison with the use of control titanium implants without coating. Conclusion. Positive results of preclinical experiments are promising for further clinical research in trauma and orthopedic  practice, which ultimately will reduce the risk of developing septic complications  and prevent the migration of metal structures and instability of endoprostheses in the postoperative period.