- adj.
- アレルゲン性の、アレルゲンの
WordNet
- relating to or having the effect of an allergen
- any substance that can cause an allergy
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/07/16 01:07:41」(JST)
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An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would otherwise be harmless to the body. Such reactions are called allergies.
In technical terms, an allergen is an antigen capable of stimulating a type-I hypersensitivity reaction in atopic individuals through Immunoglobulin E (IgE) responses.[1] Most humans mount significant Immunoglobulin E responses only as a defense against parasitic infections. However, some individuals may respond to many common environmental antigens. This hereditary predisposition is called atopy. In atopic individuals, non-parasitic antigens stimulate inappropriate IgE production, leading to type I hypersensitivity.
Sensitivities vary widely from one person (or other animal) to another. A very broad range of substances can be allergens to sensitive individuals.
Contents
- 1 Types of allergies
- 2 Fungal allergens
- 3 Common allergens
- 4 Seasonal allergies
- 4.1 Seasonal allergy diagnosis
- 4.2 Treatment
- 5 See also
- 6 External links
- 7 References
Types of allergies
Allergens can be found in a variety of sources, such as dust mite excretion, pollen, pet dander or even royal jelly.[2] Food allergies are not as common as food sensitivity, but some foods such as peanuts (a legume), nuts, seafood and shellfish are the cause of serious allergies in many people.
Officially, the United States Food and Drug Administration does recognize eight foods as being common for allergic reactions in a large segment of the sensitive population. These include peanuts, tree nuts, eggs, milk, shellfish, fish, wheat and their derivatives, and soy and their derivatives, as well as sulfites (chemical based, often found in flavors and colors in foods) at 10ppm and over. See the FDA website for complete details. It should be noted that other countries, in view of the differences in the genetic profiles of their citizens and different levels of exposure to specific foods due to different dietary habits, the "official" allergen list will change. Canada recognizes all eight of the allergens recognized by the US, and also recognizes sesame seeds,[3] and mustard.[4] The European Union additionally recognizes celery.
Another type of allergens are urushiol, a resin produced by poison ivy and poison oak, which causes the skin rash condition known as urushiol-induced contact dermatitis by changing a skin cell's configuration so that it is no longer recognized by the immune system as part of the body. Various trees and wood products such as paper, cardboard, MDF etc. can also cause mild to severe allergy symptoms through touch or inhalation of sawdust such as asthma and skin rash.[5]
An allergic reaction can be caused by any form of direct contact with the allergen—consuming food or drink one is sensitive to (ingestion), breathing in pollen, perfume or pet dander (inhalation), or brushing a body part against an allergy-causing plant (direct contact). Other common causes of serious allergy are wasp, fire ant and bee stings, penicillin, and latex. An extremely serious form of an allergic reaction is called anaphylaxis. One form of treatment is the administration of sterile epinephrine to the person experiencing anaphylaxis, which suppresses the body's overreaction to the allergen, and allows for the patient to be transported to a medical facility.
Fungal allergens
In 1952 basidiospores were described as being possible airborne allergens[6] and were linked to asthma in 1969.[7] Basidiospores are the dominant airborne fungal allergens. Fungal allergies are associated with seasonal asthma.[8][9] They are considered to be a major source of airborne allergens.[10] The basidospore family include mushrooms, rusts, smuts, brackets, and puffballs. The airborne spores from mushrooms reach levels comparable to those of mold and pollens. The levels of mushroom respiratory allergy are as high as 30 percent of those with allergic disorder, but it is believed to be less than 1 percent of food allergies.[11][12] Heavy rainfall (which increases fungal spore release) is associated with increased hospital admissions of children with asthma.[13] A study in New Zealand found that 22 percent of patients with respiratory allergic disorders tested positive for basidiospores allergies.[14] Mushroom spore allergies can cause either immediate allergic symptomatology or delayed allergic reactions. Those with asthma are more likely to have immediate allergic reactions and those with allergic rhinitis are more likely to have delayed allergic responses.[15] A study found that 27 percent of patients were allergic to basidiomycete mycelia extracts and 32 percent were allergic to basidiospore extracts, thus demonstrating the high incidence of fungal sensitisation in individuals with suspected allergies.[16] It has been found that of basidiomycete cap, mycelia, and spore extracts that spore extracts are the most reliable extract for diagnosing basidiomycete allergy.[17][18]
In Canada, 8% of children attending allergy clinics were found to be allergic to Ganoderma, a basidiospore.[19] Pleurotus ostreatus,[20] cladosporium,[21] and calvatia cyathiformis are significant airborne spores.[10] Other significant fungal allergens include aspergillus and alternaria-penicillin families.[22] In India fomes pectinatis is a predominant air-borne allergen affecting up to 22 percent of patients with respiratory allergies.[23] Some fungal air-bourne allergens such as coprinus comatus are associated with worsening of eczematous skin lesions.[24] Children who are born during autumn months (during fungal spore season) are more likely to develop asthmatic symptoms later in life.[25]
Common allergens
Main article: List of allergies
SEM of miscellaneous plant pollens. Pollens are very common allergens.
The house dust mite, its feces and chitin are common allergens around the home
In addition to foreign proteins found in foreign serum (from blood transfusions) and vaccines, common allergens include:
- Animal products
- Fel d 1 (Allergy to cats)
- fur and dander
- cockroach calyx
- wool
- dust mite excretion
- Drugs
- penicillin
- sulfonamides
- salicylates (also found naturally in numerous fruits)
- Foods
- celery and celeriac[26]
- corn or maize
- eggs (typically albumen, the white)
- fruit
- pumpkin, egg-plant
- legumes
- beans
- peas
- peanuts
- soybeans
- milk
- seafood
- sesame
- soy
- tree nuts
- pecans
- almonds
- wheat
- Insect stings
- bee sting venom
- wasp sting venom
- mosquito stings
- Mold spores
- Top 5 allergens discovered in patch tests in 2005–06:
- nickel sulfate (19.0%)
- Balsam of Peru (11.9%)
- fragrance mix I (11.5%)
- quaternium-15 (10.3%), and
- neomycin (10.0%).[27]
- Other
- latex
- metal
- wood
- Plant pollens (hay fever)
- grass — ryegrass, timothy-grass
- weeds — ragweed, plantago, nettle, Artemisia vulgaris, Chenopodium album, sorrel
- trees — birch, alder, hazel, hornbeam, Aesculus, willow, poplar, Platanus, Tilia, Olea, Ashe juniper, Alstonia scholaris
Seasonal allergies
Seasonal allergy symptoms are commonly experienced part of the year, usually during spring, summer or fall when certain trees or grasses pollinate. This depends on the kind of tree or grass. For instance, some trees such as oak, elm, and maple pollinate in the spring, while grasses such as Bermuda, timothy and orchard pollinate in the summer.
Grass allergy is generally linked to hay fever because their symptoms and causes are somehow similar to each other. Symptoms include rhinitis, which causes sneezing and a runny nose, as well as allergic conjunctivitis, which includes watering and itchy eyes.[28] Also an initial tickle on the roof of the mouth or in the back of the throat may be experienced.
Also, depending on the season, the symptoms may be more severe and people may experience coughing, wheezing, and irritability. A few people even become depressed, lose their appetite, or have problems sleeping. Moreover, since the sinuses may also become congested, some people experience headaches.[29]
If both parents suffered from allergies in the past, there is a 66% chance for the individual to suffer from seasonal allergies, and the risk lowers to 60% if just one parent had suffered from allergies. The immune system also has strong influence on seasonal allergies, since it reacts differently to diverse allergens like pollen. When an allergen enters the body of an individual that is predisposed to allergies, it triggers an immune reaction and the production of antibodies. These allergen antibodies migrate to mast cells lining the nose, eyes and lungs. When an allergen drifts into the nose more than once, mast cells release a slew of chemicals or histamines that irritate and inflame the moist membranes lining the nose and produce the symptoms of an allergic reaction: scratchy throat, itching, sneezing and watery eyes. Some symptoms that differentiate allergies from a cold include:[30]
- No fever.
- Mucous secretions are runny and clear.
- Sneezes occurring in rapid and several sequences.
- Itchy throat, ears and nose.
- These symptoms usually last longer than 7–10 days.
Among seasonal allergies, there are some allergens that fuse together and produce a new type of allergy. For instance, grass pollen allergens cross-react with food allergy proteins in vegetables such as onion, lettuce, carrots, celery and corn. Besides, the cousins of birch pollen allergens, like apples, grapes, peaches, celery and apricots, produce severe itching in the ears and throat. The cypress pollen allergy brings a cross reactivity between diverse species like olive, privet, ash and Russian olive tree pollen allergens. In some rural areas there is another form of seasonal grass allergy, combining airborne particles of pollen mixed with mold.[31] Recent research has suggested that humans might develop allergies as a defense to fight off parasites. According to Yale University Immunologist Dr Ruslan Medzhitov, protease allergens cleave the same sensor proteins that evolved to detect proteases produced by the parasitic worms.[32] Additionally, a new report on seasonal allergies called “Extreme allergies and Global Warming”, have found that many allergy triggers are worsening due to climate change. 16 states in the United States were named as “Allergen Hotspots” for large increases in allergenic tree pollen if global warming pollution keeps increasing. Therefore, researchers on this report claimed that global warming is bad news for millions of asthmatics in the United States whose asthma attacks are triggered by seasonal allergies.[33] Indeed, seasonal allergies are one of the main triggers for asthma, along with colds or flu, cigarette smoke and exercise. In Canada, for example, up to 75% of asthmatics also have seasonal allergies.[34]
Seasonal allergy diagnosis
Based on the symptoms seen on the patient, the answers given in terms of symptom evaluation and a physical exam, doctors can make a diagnosis to identify if the patient has a seasonal allergy. After performing the diagnosis, the doctor is able to tell the main cause of the allergic reaction and recommend the treatment to follow. 2 tests have to be done in order to determine the cause: a blood test and a skin test. Allergists do skin tests in one of two ways: either dropping some purified liquid of the allergen onto the skin and pricking the area with a small needle; or injecting a small amount of allergen under the skin.[35]
Alternative tools are available to identify seasonal allergies, such as laboratory tests, imaging tests and nasal endoscopy. In the laboratory tests, the doctor will take a nasal smear and it will be examined microscopically for factors that may indicate a cause: increased numbers of eosinophils (white blood cells), which indicates an allergic condition. If there is a high count of eosinophils, an allergic condition might be present.
Another laboratory test is the blood test for IgE (immunoglobulin production), such as the radioallergosorbent test (RAST), implemented to detect high levels of allergen-specific IgE in response to particular allergens. Although blood tests are less accurate than the skin tests, they can be performed on patients unable to undergo skin testing. Imaging tests can be useful to detect sinusitis in people suffering from chronic rhinitis, and they can work when other test results are ambiguous. There is also nasal endoscopy, wherein a tube is inserted through the nose with a small camera to view the passageways and examine any irregularities in the nose structure. Endoscopy can be used for some cases of chronic or unresponsive seasonal rhinitis.[36]
Treatment
Treatment includes over-the-counter medications, antihistamines, nasal decongestants, allergy shots, and alternative medicine.
In the case of nasal symptoms, antihistamines are normally the first option. They may be taken together with pseudoephedrine to help relieve a stuffy nose and they can stop the itching and sneezing. Some over-the-counter options are Benadryl and Tavist. However, these antihistamines may cause extreme drowsiness, therefore, people are advised to not operate heavy machinery or drive while taking this kind of medication. Other side effects include dry mouth, blurred vision, constipation, difficulty with urination, confusion, and light-headedness.[37]
There is also a newer second generation of antihistamines that are generally classified as the "non-sedating antihistamines" or anti-drowsy, which include cetirizine, loratadine, and fexofenadine.[38]
An example of nasal decongestants is pseudoephedrine and its side-effects include insomnia, restlessness, and difficulty urinating. Some other nasal sprays are available by prescription, including Azelastine and Ipratropium. Some of their side-effects include drowsiness. For eye symptoms, it is important to first bath the eyes with plain eyewashes to reduce the irritation. People should not wear contact lenses during episodes of conjunctivitis.
Allergy immonotherapy (AIT) treatment involves administering doses of allergens to accustom the body to induce specific long-term tolerance.[39] Allergy immunotherapy can be administered orally (as sublingual tablets or sublingual drops), or by injections under the skin (subcutaneous). Discovered by Leonard Noon and John Freeman in 1911, allergy immunotherapy represents the only causative treatment for respiratory allergies.
Immunotherapy contains a small amount of the substance that triggers the allergic reactions [40] and it should start after the pollen season to get prepared for the next season.
Natural remedies are another option that patients look to for relief. One of the most popular recently is the European herb butterbur (Petasites hybridus). The British Medical Journal published a study in which Swiss researchers proved how one tablet of butterbur four times daily was as effective as an antihistamine in controlling symptoms of hay fever.[citation needed] On a second study, a group of British researchers gave their approval to butterbur's effectiveness in battling symptoms of grass allergy. Other herbal supplements that function as remedies include freeze-dried nettles (Urtica) and a tonic made from the goldenseal herb (Hydrastis candiensis), which doctors recommend in addition to saline nasal spray (another natural remedy).[41]
See also
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External links
- General information on allergy and allergens
- Allermatch — Sequence comparison to allergenic proteins
- SDAP — Structural database of allergenic proteins
- Allergome Database
- Allergen Nomenclature
References
- ^ Goldsby, Richard A.; et al.. Immunology (5th ed.). New York: W.H. Freeman.
- ^ Rosmilah, M; et al. (December 2008). "Characterization of major allergens of royal jelly Apis mellifera". Trop Biomed 25 (3): 243–51. PMID 19287364.
- ^ "Health Canada: Food Allergies". Archived from the original on 14 June 2007. Retrieved 2007-06-09.
- ^ "CFIA: Revised Labelling Regulations for Food Allergens, Gluten Sources and Sulphites (Amendments to the Food and Drug Regulations)". Retrieved 2011-02-28.
- ^ "Wood Allergies and Toxicity". The Wood Database. Retrieved 2014-04-24.
- ^ Gregory, PH.; Hirst, JM. (September 1952). "Possible role of basidiospores as air-borne allergens". Nature 170 (4323): 414. doi:10.1038/170414a0. PMID 12993181.
- ^ Herxheimer, H.; Hyde, HA.; Williams, DA. (July 1969). "Allergic asthma caused by basidiospores". Lancet 2 (7612): 131–3. PMID 4183245.
- ^ Hasnain, SM.; Wilson, JD.; Newhook, FJ. (May 1985). "Fungal allergy and respiratory disease". N Z Med J 98 (778): 342–6. PMID 3858721.
- ^ Levetin, E. (April 1989). "Basidiospore identification". Ann Allergy 62 (4): 306–10. PMID 2705657.
- ^ a b Horner, WE.; Lopez, M.; Salvaggio, JE.; Lehrer, SB. (1991). "Basidiomycete allergy: identification and characterization of an important allergen from Calvatia cyathiformis". Int Arch Allergy Appl Immunol 94 (1–4): 359–361. doi:10.1159/000235403. PMID 1937899.
- ^ Sprenger, JD.; Altman, LC.; O'Neil, CE.; Ayars, GH.; Butcher, BT.; Lehrer, SB. (December 1988). "Prevalence of basidiospore allergy in the Pacific Northwest". J Allergy Clin Immunol 82 (6): 1076–1080. doi:10.1016/0091-6749(88)90146-7. PMID 3204251.
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- ^ Khot, A.; Burn, R.; Evans, N.; Lenney, W.; Storr, J. (July 1988). "Biometeorological triggers in childhood asthma". Clin Allergy 18 (4): 351–8. doi:10.1111/j.1365-2222.1988.tb02882.x. PMID 3416418.
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- ^ Santilli, J.; Rockwell, WJ.; Collins, RP. (September 1985). "The significance of the spores of the Basidiomycetes (mushrooms and their allies) in bronchial asthma and allergic rhinitis". Ann Allergy 55 (3): 469–71. PMID 4037433.
- ^ Lehrer, SB.; Lopez, M.; Butcher, BT.; Olson, J.; Reed, M.; Salvaggio, JE. (September 1986). "Basidiomycete mycelia and spore-allergen extracts: skin test reactivity in adults with symptoms of respiratory allergy". J Allergy Clin Immunol 78 (3 Pt 1): 478–485. doi:10.1016/0091-6749(86)90036-9. PMID 3760405.
- ^ Weissman, DN.; Halmepuro, L.; Salvaggio, JE.; Lehrer, SB. (1987). "Antigenic/allergenic analysis of basidiomycete cap, mycelia, and spore extracts". Int Arch Allergy Appl Immunol 84 (1): 56–61. doi:10.1159/000234398. PMID 3623711.
- ^ Liengswangwong, V.; Salvaggio, JE.; Lyon, FL.; Lehrer, SB. (May 1987). "Basidiospore allergens: determination of optimal extraction methods". Clin Allergy 17 (3): 191–8. doi:10.1111/j.1365-2222.1987.tb02003.x. PMID 3608137.
- ^ Tarlo, SM.; Bell, B.; Srinivasan, J.; Dolovich, J.; Hargreave, FE. (July 1979). "Human sensitization to Ganoderma antigen". J Allergy Clin Immunol 64 (1): 43–49. doi:10.1016/0091-6749(79)90082-4. PMID 447950.
- ^ Lopez, M.; Butcher, BT.; Salvaggio, JE.; Olson, JA.; Reed, MA.; McCants, ML.; Lehrer, SB. (1985). "Basidiomycete allergy: what is the best source of antigen?". Int Arch Allergy Appl Immunol 77 (1–2): 169–170. doi:10.1159/000233775. PMID 4008070.
- ^ Stephen, E.; Raftery, AE.; Dowding, P. (August 1990). "Forecasting spore concentrations: a time series approach". Int J Biometeorol 34 (2): 87–89. doi:10.1007/BF01093452. PMID 2228299.
- ^ Dhillon, M. (May 1991). "Current status of mold immunotherapy". Ann Allergy 66 (5): 385–92. PMID 2035901.
- ^ Gupta, SK.; Pereira, BM.; Singh, AB. (March 1999). "Fomes pectinatis: an aeroallergen in India". Asian Pac J Allergy Immunol 17 (1): 1–7. PMID 10403002.
- ^ Fischer, B.; Yawalkar, N.; Brander, KA.; Pichler, WJ.; Helbling, A. (October 1999). "Coprinus comatus (shaggy cap) is a potential source of aeroallergen that may provoke atopic dermatitis". J Allergy Clin Immunol 104 (4 Pt 1): 836–841. doi:10.1016/S0091-6749(99)70295-2. PMID 10518829.
- ^ Harley, KG.; Macher, JM.; Lipsett, M.; Duramad, P.; Holland, NT.; Prager, SS.; Ferber, J.; Bradman, A. et al. (April 2009). "Fungi and pollen exposure in the first months of life and risk of early childhood wheezing". Thorax 64 (4): 353–8. doi:10.1136/thx.2007.090241. PMC 3882001. PMID 19240083.
- ^ Bublin M; Radauer C; Wilson IBH; Kraft D; Scheiner O; Breiteneder H; Hoffmann-Sommergruber K (2003). "Cross-reactive N-glycans of Api g 5, a high molecular weight glycoprotein allergen from celery, are required for immunoglobulin E binding and activation of effector cells from allergic patients". FASEB 17 (12): 1697–9. doi:10.1096/fj.02-0872fje. PMID 12958180.
- ^ Zug KA, Warshaw EM, Fowler JF Jr, Maibach HI, Belsito DL, Pratt MD, Sasseville D, Storrs FJ, Taylor JS, Mathias CG, Deleo VA, Rietschel RL, Marks J. Patch-test results of the North American Contact Dermatitis Group 2005–2006. Dermatitis. 2009 May–Jun;20(3):149-60.
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- ^ Weinmann, Aileo (2010-04-14) Seasonal allergies getting worse from Climate Change National Wildlife Federation. Media Center. Retrieved on 2010-08-31
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UpToDate Contents
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- 1. 食物アレルゲン：臨床的特徴および交叉反応の概要 food allergens overview of clinical features and cross reactivity
- 2. アレルゲン抽出液：組成、製造および表示 allergen extracts composition manufacture and labeling
- 3. 環境中のアレルゲンサンプリング allergen sampling in the environment
- 4. 喘息およびアレルギー性鼻炎の治療におけるアレルゲン回避策 allergen avoidance in the treatment of asthma and allergic rhinitis
- 5. SCIT：治療用アレルゲンエキスの調製 scit preparation of allergen extracts for therapeutic use
English Journal
- In vitro digestibility and immunoreactivity of bovine milk proteins.
- Do AB1, Williams K1, Toomer OT2.
- Food chemistry.Food Chem.2016 Jan 1;190:581-7. doi: 10.1016/j.foodchem.2015.05.113. Epub 2015 May 28.
- Current models of digestibility solely utilize pepsin stability to assess the safety of allergenic food proteins. However, in vivo complete protein digestion requires acid denaturation and pepsin, trypsin, and/or chymotrypsin cleavage. This study aimed to identify the immunoreactivity and allergenic
- PMID 26213013
- Attenuated Allergenic Activity of Ovomucoid After Electrolysis.
- Kido J1,2, Matsumoto T3,4,5.
- Allergy, asthma & immunology research.Allergy Asthma Immunol Res.2015 Nov;7(6):599-604. doi: 10.4168/aair.2015.7.6.599. Epub 2015 Jul 7.
- Ovomucoid (OMC) is the most prominent allergen causing hen's egg allergy, containing disulfide (S-S) bonds that may be responsible for its allergic action. As S-S bonds may be reduced during electrolysis, this study was undertaken to evaluate modulation of the allergic action of OMC after electrolys
- PMID 26333707
- Antimicrobial activity of the synthesized non-allergenic urushiol derivatives.
- Cho JY1, Park KY1, Kim SJ2, Oh S3, Moon JH1.
- Bioscience, biotechnology, and biochemistry.Biosci Biotechnol Biochem.2015 Nov;79(11):1915-8. doi: 10.1080/09168451.2015.1061418. Epub 2015 Jun 30.
- Synthesized urushiol derivatives possessing different carbon atomic length in the alkyl side chain inhibited the growth of food spoilage and pathogenic microorganisms. Particularly, non-allergenic 3-pentylcatechol showed a broad antimicrobial spectrum on an agar plate. Most food spoilage and pathoge
- PMID 26125525
Japanese Journal
- ブタクサに対する殺虫剤の直接的影響―天敵排除試験が意味するもの
- 日本農薬学会誌（Ｊｏｕｒｎａｌ ｏｆ Ｐｅｓｔｉｃｉｄｅ Ｓｃｉｅｎｃｅ）, 2018
- NAID 130006267915
- Expression Profiling of Strawberry Allergen Fra a during Fruit Ripening Controlled by Exogenous Auxin
- International Journal of Molecular Sciences 18(6), 1186, 2017-06
- NAID 120006352248
- 加工食品における小麦タンパク質の不溶化とアレルゲン性の変化について
- アレルギー = Japanese journal of allergology 66(3), 222-230, 2017-05
- NAID 40021209211
Related Links
- allergenicとは。意味や和訳。[形]アレルギーを起こす. ⇒al・ler・gen - goo英和辞書は14万項目以上を収録し、発音、音声、慣用句、例文が分かる英和辞書です。
- an·ti·gen·ic (an-ti-jen'ik), Having the properties of an antigen (allergen). Synonym(s): allergenic, immunogenic allergenic [al′ərjen′ik] provoking allergic reactions. an·ti·gen·ic (an'ti-jen'ik) Having the properties of an antigen (allergen). ...
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