We’ve been taught that good gut bacteria are allies in our health journey.
They aid digestion, protect against infections, and keep our systems running smoothly. But there’s more to the story than meets the eye.
A groundbreaking new study in mice reveals that even these helpful microbes can spark serious health issues.
Researchers found that a specific type of immune cell, triggered by common gut bacteria, might play a key role in the development of rheumatoid arthritis.
These cells, known as TFH17, are hybrids – part T follicular helper cell, part T helper 17 cell. And they don’t stay put.
Instead, they travel through the body, affecting the immune system far beyond the gut.
Cells with a double identity
What makes these cells so dangerous is their flexibility. Unlike typical immune cells, TFH17 cells can change depending on their environment.
This trait, known as plasticity, allows them to morph and adapt – often in harmful ways.
In this study, scientists observed that these hybrid cells emerge in the gut’s lymphoid tissue, driven by bacteria that normally don’t cause harm.
Once formed, the cells move out of the intestine and start interacting with B cells, another part of the immune system that plays a major role in autoimmune diseases.
This interaction can tip the balance, pushing the body’s defenses into overdrive.
This results in chronic inflammation and joint damage – hallmarks of rheumatoid arthritis.
A new path for treatment
To test the impact of these cells, scientists replaced just 20 % of standard TFH cells in mice with the hybrid TFH17 version.
The outcome was striking: the mice showed nearly five times worse arthritis symptoms compared to the control group.
Even more concerning, the researchers found a similar cell signature in humans with rheumatoid arthritis.
That means the process observed in mice may already be happening in our own bodies.
This discovery could change how we understand autoimmune diseases – not just rheumatoid arthritis, but possibly lupus and others too.
Targeting these rogue immune cells could offer a new path for treatment.
This article is based on information from Medicalxpress.com.