MRSA Exploits Kidney’s Inner Environment to Persist and Spread
New research reveals how MRSA exploits the kidney’s hyperosmotic inner medulla to evade immune defenses, establish a persistent reservoir, and spread, while suggesting potential therapeutic strategies to limit infection. The post MRSA Exploits Kidney’s Inner Environment to Persist and Spread appeared first on GEN - Genetic Engineering and Biotechnology News .
Methicillin-resistant Staphylococcus aureus (MRSA) has become a significant global health threat, with deaths from S. aureus infections doubling since 1990. MRSA, which accounts for the largest increase in global antimicrobial resistance, often invades the bloodstream and can lead to kidney injury and failure. The exact tissue reservoirs that enable MRSA persistence have remained unclear.
This study, published in Science Translational Medicine, reveals how MRSA takes advantage of the kidney's inner environment to establish a bacterial reservoir and avoid immune detection. Intravenous MRSA infection in mice, combined with advanced imaging, transcriptomics, genetics, and cell-based assays, allowed researchers to understand these mechanisms.
The renal inner medulla, where urine concentration occurs, emerged as the MRSA reservoir. Here, in the hyperosmotic niche, MRSA evades the immune system and utilizes tissue polyamines to grow and spread towards the renal cortex. The extreme osmotic environment also protects MRSA from immune detection and delays neutrophil migration to the infection site.
The study discovered that the loop diuretic furosemide could restore neutrophil infiltration and limit MRSA's spread in infected mice kidneys. The authors suggest that modulating medullary osmolality and bacterial polyamine metabolism could offer potential adjunctive strategies to limit renal persistence and dissemination during MRSA bacteremia.
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