The immune system is the guarantor of our body’s continuous defense, fighting millions of microbes every day. Although the role of the thymus in eliminating harmful immune cells (central tolerance) was previously known, the main question remained unclear: What is the mechanism by which the cells that escaped thymic selection and are already circulating in the blood are controlled?
This key question was answered by this year’s Nobel Prize laureates in Physiology or Medicine. The scientists—Mary Brunckow, Fred Ramsdell, and Shimon Sakaguchi—discovered the mechanism of peripheral tolerance. They determined that regulatory T cells (Tregs), the “security guards” of the immune system, directly protect the body from autoimmune damage. This breakthrough fundamentally changes the prospects for treating autoimmune diseases and cancer.
These cells (Tregs) were first described by Shimon Sakaguchi in 1995. He showed that this type of cell is vitally important for balancing the immune system to prevent an autoimmune attack from developing.
Sakaguchi’s discovery is complemented by the research of Mary Brunckow and Fred Ramsdell, who determined the crucial role of the Foxp3 gene in the formation of regulatory T cells. They proved that a mutation in Foxp3 causes severe autoimmune diseases. Their joint work explains how this genetic lever manages the activity of the immune system.
Therapeutic Potential:
- Stimulating regulatory T cells is promising for the treatment of autoimmune diseases such as Type 1 diabetes and multiple sclerosis.
- Conversely, suppressing these cells can trigger an immune attack against cancer, as tumors often use Tregs to escape immune control.
- Experimental treatments aimed at balancing the immune system are currently in the clinical trial stage.
This Nobel Prize clearly reflects the power of fundamental research, which begins with curiosity and culminates in medical achievements of global importance. The work of the laureates once again convinces us that acquiring deep, theoretical knowledge is the foremost source for the development of new therapies.
Source: The Nobel Prize; Science
