The team of immunologists have identified a cell component which plays a key role in triggering allergic responses to cat dander.
The discovery furthers our understanding of how the body’s immune system identifies and reacts to allergens, which could pave the way in developing new ways of treating allergies.
The development is especially good news for the millions of people with asthma whose condition is often worsened by their allergy to airborne allergens from cat dander or house dust mite. Cat dander consists of microscopic pieces of cat skin which easily become airborne.
The team was led by the two Doctors Ghaem-Maghami and Martinez-Pomares at The University of Nottingham. Ghaem-Maghami said: “There has been a sharp increase in the prevalence of allergies over the past few decades and allergic asthma among children has reached epidemic proportions in many industrialised countries, including the UK.
He added: “Many people with asthma are highly sensitive to airborne allergens such as cat dander or house dust mite — in fact many studies have shown that up to 40 percent of children with asthma are allergic to cat allergens.
“A better understanding of how the interaction between allergens and the immune system leads to allergy is vital if we are to develop more effective and efficient treatments for this debilitating condition.”
The Nottingham work has focused on the role of the mannose receptor (MR), a receptor found on the surface of dendritic cells. These cells are among the first cells in the immune system that come into contact with allergens.
The team recently found that the MR binds to a wide range of allergens and plays an important role in the allergic response to house dust mite allergens. In their latest study they looked at the contribution of MR to allergy caused by a major cat allergen called Fel d 1.
They were able to prove that MR is needed for the body to recognise Fel d 1 as a potential foreign invader and for the production of IgE against Fel d 1. The discovery shows that MR plays a pivotal role not only in recognising allergens but also in provoking the body’s allergic response to them.
Allergy is a disorder caused by the body’s immune system reacting to usually harmless substances found in the environment, known as allergens. Believing itself under attack, the immune system produces a molecule called IgE, which eventually leads to release of further chemicals (including histamine) by certain immune cells which together cause an inflammatory response and the classic symptoms of allergy — itchy eyes, sneezing, runny nose and wheezing.
MEDICA.de; Source: University of Nottingham