Lungs' hidden cells may hold the key to stopping allergies for good

Respiratory allergies have surged in recent years, particularly in countries like India, China, and parts of Europe. Rising air pollution and longer pollen seasons—linked to climate change—are driving the increase. Now, new research suggests a way to prevent these reactions by harnessing the lung's own cells.

A study led by scientists at France's Pasteur Institute found that exposing lungs to microbial fragments creates long-lasting protection against allergies. In experiments, mice given these fragments before encountering an allergen showed no allergic reaction. Even after three months, the protection remained strong.

The key discovery was that this immunological memory is stored not in immune cells but in fibroblasts—connective tissue cells in the lungs. These fibroblasts undergo epigenetic changes that block allergic responses. Without this initial protective exposure, mice developed severe lung hypersensitivity upon re-exposure to allergens.

The findings challenge previous assumptions about how allergies are controlled. Instead of relying on immune cells, the study shows that structural cells in the lungs play a central role in preventing reactions.

The research opens new possibilities for preventing respiratory allergies, which are rising sharply worldwide. By targeting fibroblasts, future treatments could offer long-term protection against allergy symptoms. This approach may help address the growing burden of allergies linked to pollution and climate change.