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RSS FeedsViruses, Vol. 10, Pages 622: Antibiotic Therapy Using Phage Depolymerases: Robustness Across a Range of Conditions (Viruses)

 
 

13 november 2018 02:00:02

 
Viruses, Vol. 10, Pages 622: Antibiotic Therapy Using Phage Depolymerases: Robustness Across a Range of Conditions (Viruses)
 


Phage-derived depolymerases directed against bacterial capsules are showing therapeutic promise in various animal models of infection. However, individual animal model studies are often constrained by use of highly specific protocols, such that results may not generalize to even slight modifications. Here we explore the robustness of depolymerase therapies shown to succeed in a previous study of mice. Treatment success rates were reduced by treatment delay, more so for some enzymes than others: K1- and K5 capsule-degrading enzymes retained partial efficacy on delay, while K30 depolymerase did not. Phage were superior to enzymes under delayed treatment only for K1. Route of administration (intramuscular versus intraperitoneal) mattered for success of K1E, possibly for K1F, not for K1H depolymerase. Significantly, K1 capsule-degrading enzymes proved highly successful when using immune-suppressed, leukopenic mice, even with delayed treatment. Evolution of bacteria resistant to K1-degrading enzymes did not thwart therapeutic success in leukopenic mice, likely because resistant bacteria were avirulent. In combination with previous studies these results continue to support the efficacy of depolymerases as antibacterial agents in vivo, but system-specific details are becoming evident.


 
123 viewsCategory: Epidemiology, Virology
 
Viruses, Vol. 10, Pages 623: Following in the Footsteps of the Chikungunya Virus in Brazil: The First Autochthonous Cases in Amapá in 2014 and Its Emergence in Rio de Janeiro during 2016 (Viruses)
Viruses, Vol. 10, Pages 627: Causes and Consequences of Spatial Within-Host Viral Spread (Viruses)
 
 
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