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American Focus > Blog > Tech and Science > Why Do Allergens Make Us Cough and Sneeze?
Tech and Science

Why Do Allergens Make Us Cough and Sneeze?

Last updated: July 31, 2025 7:40 pm
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Why Do Allergens Make Us Cough and Sneeze?
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Allergens May Make Us Cough and Sneeze by Poking Holes in Airway Cells

The immune system is a complex network of cells and proteins that defend the body against harmful invaders. When it comes to allergies, the immune system can sometimes misidentify harmless substances as threats, leading to uncomfortable symptoms like coughing, sneezing, and itchy eyes. A recent study published in Nature sheds light on a new mechanism behind these allergic reactions.

Researchers have discovered that certain allergens have the ability to create pores in the membranes of airway cells. These pores are formed by proteins found in allergens such as mold, airborne particles, and venom. When these proteins create pores in the cell membranes, calcium ions enter the cells and trigger the release of molecules that alert the immune system to potential danger.

This finding challenges the traditional understanding of how allergies are triggered. Instead of focusing solely on the allergen itself or downstream immune responses, researchers can now explore ways to target the pore-forming proteins that initiate the immune response. By understanding this mechanism, new strategies for allergy treatment could be developed.

In a study conducted by researchers in Beijing, China, two pore-forming proteins were identified in the mold Alternaria alternata, a common allergen that affects about 5% of the population. These proteins, Aeg-S and Aeg-L, create pores in the membranes of cells lining the nose, throat, and lungs. This process sets off a chain reaction that leads to airway inflammation and allergic symptoms.

Further experiments on mice showed that exposure to pore-forming proteins from other allergens, such as Aspergillus niger and Actinia equina, also triggered immune responses similar to those induced by Aeg-S and Aeg-L. This suggests that pore-forming proteins may be a common trigger for allergic reactions, regardless of the specific allergen.

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The implications of this study are significant for the field of allergy research. By targeting pore-forming proteins in allergens, researchers may be able to develop more effective treatments for allergic reactions. Future investigations will focus on understanding the immune response pathways activated by these proteins and whether other allergens use similar mechanisms to trigger allergic symptoms.

This groundbreaking research, published in Nature, provides new insights into the underlying causes of allergic reactions. By unraveling the role of pore-forming proteins in triggering immune responses, scientists are paving the way for innovative approaches to allergy treatment.

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