Allergen

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allergen

 [al´er-jen]
1. a substance, protein or nonprotein, capable of inducing allergy or specific hypersensitivity.
2. a purified protein of a food (such as milk, eggs, or wheat), bacterium, or pollen. adj., adj allergen´ic. Allergens are used to test a patient for hypersensitivity to specific substances (see skin test). They are also used to desensitize or hyposensitize allergic individuals (see immunotherapy).

Almost any substance in the environment can be an allergen. The list of known allergens includes plant pollens, spores of mold, animal dander, house dust, foods, feathers, dyes, soaps, detergents, cosmetics, plastics, and drugs. Allergens can enter the body by being inhaled, swallowed, touched, or injected. Once the allergen comes in contact with body cells it sets off a series of immune responses that can range from localized inflammation to a fatal systemic anaphylaxis.

al·ler·gen

(al'er-jen),
An antigen that induces an allergic or hypersensitive response.
[allergy + G. -gen, producing]

allergen

(ăl′ər-jən)
n.
A substance, such as pollen, that causes an allergy.

al′ler·gen′ic (-jĕn′ĭk) adj.

allergen

Any biomolecular substance (antigen) capable of evoking an allergic reaction, specifically a type-1 hypersensitivity reaction through immunoglobulin E-mediated reaction.

allergen

Immunology A substance–eg, pollen, dander, mold, which can evoke an immediate-type hypersensitivity–allergic reaction, triggering a release of histamine. See Airborne allergen, Cockroach allergen, Feline allergen, Immunogenic allergen.

al·ler·gen

(al'ĕr-jĕn)
An incitant of altered reactivity (allergy), an antigenic substance.
[allergy + G. -gen, producing]

allergen

Any ANTIGEN causing ALLERGY or causing an allergic reaction in a sensitive person.

allergen

an antigen that produces an allergic response.

Allergen

A foreign substance, such as mites in house dust or animal dander which, when inhaled, causes the airways to narrow and produces symptoms of asthma.

al·ler·gen

(al'ĕr-jĕn)
Antigen that induces an allergic or hypersensitive response.
[allergy + G. -gen, producing]

Patient discussion about Allergen

Q. How do I diagnose an allergy? I think I’m allergic to something. I’ve been having running nose, sneezing, and even problems breathing every once in a while. How can I find the cause?

A. There can be thousands of materials that you are allergic to. But usually people are allergic to the same things (cats, pets in general, type of foods and so forth..). what you can do is an allergy test- It’ll cover most of the usual things. Here is a video that explains it:
http://www.5min.com/Video/Allergy-Testing-9036

Q. Can it be that I stopped being allergic to cats? is it a miracle? I was allergic to cats in my childhood, and yesterday a friend cat jumped on me and nothing happened.

A. NO,IF NOTHING HAPPENED

More discussions about Allergen
References in periodicals archive ?
These results suggested that the protein composition among peanut varieties could disclose significant differences by genetic polymorphism, and this could account for a natural variability in the final allergenicity of the specific variety.
Moreno et al., "Effect of in vitro gastric and duodenal digestion on the allergenicity of grape lipid transfer protein," The Journal of Allergy and Clinical Immunology, vol.
Stinson says that connecting climate-induced trends in allergenicity with public health impacts could be challenging.
"Revised Guidelines for research in transgenic plants & Guidelines for toxicity and allergenicity evaluation of transgenic seeds, plants and plant parts, 1998" describes the role of the National Bureau of Plant Genetic Resources (NBPGR) to issue the phytosanitary certificate, which is crucial for the import of transgenic material.
In the recent years, a variety of PR proteins and their homologues causing allergenicity in humans have been isolated and characterized [53-56].
Allelic variation in these genes will allow further investigation in order to relate them to a different allergenicity level.
In order to determine the allergenicity of Per a 5, we examined the ability of Per a 5 to bind IgE in the sera of American CR allergy by a direct ELISA technique.
Tsukuba, Japan, Oct 3, 2013 - (ACN Newswire) - Titanium (Ti) and its alloys are the most popular materials used in orthopedic implants because of their good mechanical and chemical properties, biocompatibility, corrosion resistance and low allergenicity. One drawback, however, is that they cannot bond directly to living bone, but need to be coated with bioactive materials to improve their integration.
Vytex NRL supplier Vystar Corporation (OTC Pink:VYST) said on Thursday that the European Patent Office issued a Decision to Grant its patent application under European Patent Number 1 902 089 titled "Decreasing Allergenicity of Natural Latex Rubber Prior to Vulcanization" greatly expanding its territory under its intellectual property portfolio.
From the standpoint of allergenicity and efficacy, parabens are close to ideal.
"This means that the safety of these specific GM crops should be assessed on a case-by-case basis, following the Codex Alimentarius guidelines for determining their safety, including toxicity, allergenicity and nutritional quality, or assessment of any nutritional claim," it stated.
While proteins and peptides have excellent potential as food antioxidants, issues such as allergenicity and bitter off-flavors as well as their ability to alter food texture and color need to be addressed.