Saturday, July 21, 2012

Are Allergies Contributing to My Asthma?

Studies demonstrate that at least 60% of adults with asthma and 80% of children with asthma are sensitized to one or more common environmental allergens. But what is allergic sensitization, and how might being allergic to something contribute to asthma?


Allergies are the result of the immune system, a complex and diverse group of cells in the body, many of which start of in the bone marrow, then circulate in the blood as white blood cells, and eventually leave the blood to enter body tissues like the lungs and the gastrointestinal tract. It is believed that the immune system’s main function is to defend the body against danger. Most often, that danger is from infection – the invasion of the body by micro-organisms like bacteria, viruses, parasites, and fungi. The immune system is not only like a combined armed forces, police, and fire department (defending the healthy “citizens” of the body), but also a like a border guard, checking the identity of things that enter into the body every day when we breath, eat, and drink – weeding out the “terrorists” from the “tourists.”

Although a precise understanding of the molecular and cellular details is incomplete, a popular hypothesis is that allergies result when the immune system mistakenly identifies a harmless substance (such as dust mite or cat dander protein) as if it were dangerous. The immune response against these substances constitutes an allergic reaction. Among the many cells involved in such reactions, the mast cell is a powerful central player in allergies. Armed with claw-like molecules called “IgE antibodies,” mast cells in the airways can bind to allergenic proteins, which triggers the release of mast cell inflammatory chemicals like histamine, leukotrienes, and cytokines that bring about many of the features of asthma. Mast cell activation by allergens can lead to airway spasm (bronchoconstriction), mucus hypersecretion, and the influx of other inflammatory cells such as eosinophils. This allergic inflammation results in asthma symptoms like wheezing, cough, and breathlessness.

Allergies such as “hay fever” (known in medical parlance as “allergic rhinitis”) are common. Knowing whether allergies contribute to asthma can be an important part of prevention and treatment. If allergies are part of what drives your asthma, avoidance of allergic triggers, treatment with allergy medications, and the use of allergy immunotherapy (“allergy shots”) to reprogram the immune system away from its mistaken attack against common harmless substances may help. Allergy testing –blood testing or skin testing – in conjunction with a careful history and physical exam at a visit with an allergist can answer the question of whether or not allergies are contributing to your asthma.

6 comments:

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  2. Asthma child symptom is similar to that of adult asthma symptoms. Symptoms may vary between adults and children, where either one may experience
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