Helios Expression In Naïve Cd4+ T Cells Decreases From Neonates To Older Adults
Our immune system is a complex network that changes throughout our lives. A recent study sheds light on one such change, focusing on a protein called Helios, found in a specific type of immune cell known as naïve CD4+ T cells. These cells are like the immune system’s blank slates, ready to be trained to fight new threats.
The research reveals a continuous decline in Helios expression within these naïve CD4+ T cells, starting from before birth and continuing into old age. This decrease is quite significant, with expression dropping by about 40% each decade. This age-related reduction in Helios appears to be linked to changes in our DNA, specifically epigenetic modifications around the gene responsible for making Helios.
What does this mean for our health? In early life, high Helios levels might contribute to a more “Treg-like” state in these immune cells, promoting immune tolerance—a crucial mechanism to prevent the body from attacking harmless substances. As we age and Helios levels drop, these cells tend to shift towards a “memory-like” profile, potentially leading to a dominance of immune responses over tolerance. This shift could explain why older adults are more susceptible to chronic inflammatory conditions and autoimmune diseases, where the immune system mistakenly attacks the body’s own tissues. Essentially, the findings suggest that the decreasing levels of this protein over time play a role in how our immune system transitions from being highly tolerant in youth to potentially overactive in later life.
Source: link to paper