New research shows that some good bacteria living in our stomach can send tiny proteins straight into our own cells. This tiny delivery system can change how our immune system works.
How the Bacteria Do It
The scientists discovered that many harmless gut microbes have a tiny syringe called a type III secretion system. This syringe can push bacterial proteins into the cells that line our gut.
What Happens Inside Our Cells
The team studied more than a thousand connections between bacterial proteins and human proteins. They found that the bacterial proteins often touch pathways that control immunity and metabolism.
Further lab tests showed that these proteins can turn on or turn off important immune signals, such as the NF‑κB pathway and cytokine messages. Cytokines are the messengers that tell the immune system when to act.
Possible Link to Crohn’s Disease
When the researchers looked at people with Crohn’s disease, they saw more of the bacterial genes that make these injection proteins. This suggests that the direct protein transfer might help keep the gut inflamed for a long time.
Why This Matters
Finding this hidden way that gut bacteria talk to our cells moves the science beyond simple observations. It shows a direct cause‑and‑effect link that could explain why changes in the microbiome are tied to disease.
Future studies will try to see exactly how each bacterial protein works in different parts of the body and in different illnesses. Understanding these details could lead to better ways to stop or treat diseases linked to the gut microbiome.