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

/al·ler·gen/ (al´er-jen) an antigenic substance capable of producing immediate hypersensitivity (allergy).allergen´ic
pollen allergen  any protein antigen of weed, tree, or grass pollens capable of causing allergic asthma or rhinitis; pollen antigen extracts are used in skin testing for pollen sensitivity and in immunotherapy (desensitization) for pollen allergy.

allergen

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

al′ler·gen′ic (-jĕn′ĭk) adj.

allergen

[al′ərjin]
Etymology: Gk, allos, other, ergein, to work, genein, to produce
an environmental substance that can produce a hypersensitive reaction in the body but may not be intrinsically harmful. Common allergens include pollen, animal dander, house dust, feathers, and various foods. Studies indicate that one of six Americans is hypersensitive to one or more allergens. Methods of identifying specific allergens affecting individuals include the patch test, the scratch test, the radioallergosorbent test, and the Prausnitz-Küstner test. See also allergic reaction, allergy. allergenic, 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.

allergen

surface protein residues (e.g. on pollens, latex) that trigger an allergic response (e.g. hayfever, asthma, eczema, dermatitis, anaphylactoid reactions) in susceptible and hypersensitive individuals

allergen,

n allergy-producing foreign substance.

al·ler·gen

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

allergen (al´urjen),

n a substance capable of producing an allergic response or antigen. Common allergens are pollens, dust, drugs, and foods. See also antigen.

allergen

1. a substance, protein or nonprotein, capable of inducing allergy or specific hypersensitivity.
2. an extract of any substance known to cause allergy.
Allergens are used to test a patient for hypersensitivity to specific substances (see skin test). They are also used to densensitize 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, food preservatives, dyes, drugs, inorganic chemicals and vaccines. Allergens can enter the body by being inhaled, swallowed, touched or injected. Following primary exposure to an allergen, subsequent exposures result in hypersensitivity (allergic) reactions which may be immediate or delayed, local or systemic and include anaphylaxis and contact dermatitis.

alum-precipated allergen
an allergen extract used in intradermal and scratch allergy skin testing; the allergen is adsorbed onto alum to slow antigen release and provide a slower, more persistent immune stimulation. Local tissue reactions and skin nodules may follow their use.
aqueous allergen
a form of allergen extract used in intradermal and scratch allergy skin testing. In hyposensitization regimes, it is rapidly absorbed, but requires more frequent administration.
emulsion allergen
allergen extracts prepared in propylene glycol glycerin, or mineral oil. They give the most sustained effect when used in hyposensitization regimes.

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 ?
However, the new data are prodding the agency to develop standardized assays so that microbial-pesticide developers can rank the relative allergenicity of their products.
The similarity of the immune response to that observed in humans raises the possibility that the dog could be used to study food allergy and that this model could potentially be used to assess the allergenicity of proteins, including those to which human populations have not been exposed.
What end points are appropriate for the premarket assessment of previously sensitized individuals to source proteins versus the post-market assessment of potentially sensitized individuals to source proteins as well as the potential sensitization and allergenicity of novel proteins?
Although some practical considerations make rodents the model of choice for many labs, several nonrodent models have proven useful in evaluating food allergenicity.
Four years ago, the Food and Drug Administration instructed companies that were developing transgenic crops to test their new products for allergenicity if they carry genes from a material, such as nuts, to which many people have allergies.
There is also the problem of allergenicity and biocompatibility of this foreign object in the body.
The aim of this study was to determine pollen allergenicity of this plant that is no data about it till now and compare it in control area and polluted area in order to investigate the environmental effects on pollens allergenicity.
As for allergenicity concerns, Muir and Van Eenennaam contend that there are no data to support the claim that the genetically engineered salmon carry substantially more allergens than nongenetically engineered salmon.
The higher levels of pollen were partially offset by its weaker allergenicity.
Our aim was to quantify individual latex allergens to assess the allergenicity of latex products used in health care settings, to minimise the risk of sensitisation to these proteins.
Cow's milk allergy: The hydrolysis of bovine milk proteins is done to reduce the allergenicity of these proteins before they are administered to the infant.
Bet v 1 is the protein that embodies most of the allergenicity of birch pollen, so called the major allergen of birch pollen.