A course of antibiotics can fully reverse severe damage to blood-forming stem cells caused by chronic salmonella infections, according to a study by researchers at Ben-Gurion University of the Negev published in Cell Reports. The findings demonstrate that while persistent bacterial infection forces stem cells into an exhausted state, the damage is not permanent if the underlying infection is cleared.
How does chronic salmonella affect bone marrow?
Chronic salmonella infection disrupts the body’s ability to produce healthy blood and immune cells by exhausting stem cells located in the bone marrow. According to the study led by Prof. Roi Gazit and Dr. Ofir Cohen of Ben-Gurion University’s Shraga Segal Department of Microbiology, Immunology, and Genetics, persistent infection forces normally dormant stem cells into continuous cycles of division. This process depletes the cells’ regenerative capacity, leaving them biased toward producing inflammatory white blood cells rather than maintaining a balanced immune system.
Within 14 days of infection, blood stem cells can lose nearly all of their regenerative capacity if transplanted into a new host.
Can damaged stem cells recover after treatment?
Yes, the damage is fully reversible through a curative course of antibiotics. The research team found that once the bacterial infection was eliminated, the animals regained lost weight, enlarged spleens returned to normal size, and stem cells reverted to their dormant state. Laboratory tests confirmed that the recovered stem cells successfully rebuilt healthy blood and immune systems.
What are the implications for medical transplants?
The study introduces a new rule for bone marrow transplants: cure the donor’s infection and let the stem cells rest before trying to transplant them. The authors note that proving adult stem cells can “bounce back” from severe bacterial challenges highlights the necessity of screening for donor immune health to guarantee successful outcomes.
Pro Tips for Understanding Immune Health
- Monitor systemic stress: Chronic infections often manifest as weight loss and spleen enlargement, both of which serve as indicators of bone marrow stress.
- Prioritize recovery: Post-infection, the body requires a period of dormancy for stem cells to regain their regenerative potential.
- Screening is key: Before any medical procedure involving stem cells, verify the absence of active or recent chronic bacterial infections.
Frequently Asked Questions
Are all blood stem cell injuries permanent?
No. According to the Ben-Gurion University study, stem cell exhaustion caused by chronic salmonella is reversible once the infection is treated with antibiotics.
How does salmonella change stem cell behavior?
The infection forces dormant stem cells to divide continuously to fight the bacteria, causing them to become “exhausted” and skewed toward producing inflammatory cells instead of healthy immune cells.
Why is this important for bone marrow donors?
Donors with chronic infections may have compromised stem cells. The research suggests that donors must be cleared of infection and allowed a recovery period to ensure the transplanted cells are capable of rebuilding a recipient’s immune system.
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