Abstract:
BACKGROUND:Allergy to pollen from gymnosperms is well documented in the West. However, many allergenic species are native to the Himalayan region of India, and Cedrus deodara (Pinaceae) was selected for allergologic investigation. The objective was to define the allergologic and immunochemical aspects of C. deodara pollen. METHODS:Pollen antigen from C. deodara (CD) was prepared and characterized by biochemical and biologic assays. Specific IgE binding was determined by means of ELISA and immunoblotting. RESULTS:CD pollen antigen caused marked skin sensitivity in 7.5% of an atopic population. A significantly elevated level of CD-specific IgE antibodies was observed in 65.8% of the skin-positive patients. Immunoblotting showed protein fractions of 37, 44, 58, and 78 kDa with 100% binding with the patients' sera suspected to be due to carbohydrate moieties. CONCLUSIONS:Patients from the Himalayan region, where CD occurs naturally, were sensitized more than patients from distant places. The immunochemical characterization revealed multiple protein fractions from low to very high molecular mass (14-126 kDa) mostly in the acidic pI range. CD pollen has been recognized as a new allergen from India for the first time. The role of pollen as a causative agent of respiratory allergic disorders is very well established, as is evident from the recent increase of reports from across the world (1-4). India is blessed with the richest flora on the earth, from alpine tundra to Rajasthan desert. Consequently, it provides considerable variation in the quality and quantity of airborne pollen in different ecogeographic regions of the country (5-8). Although studies on the allergenic properties of airborne pollen from various species have been carried out by several workers in India (9-12), information on allergy to aerial pollen from Himalayan tree species has been completely
journal_name
Allergyjournal_title
Allergyauthors
Rawat A,Singh A,Singh AB,Gaur SN,Kumar L,Roy I,Ravindrun Pdoi
10.1034/j.1398-9995.2000.00491.xkeywords:
subject
Has Abstractpub_date
2000-07-01 00:00:00pages
620-6issue
7eissn
0105-4538issn
1398-9995journal_volume
55pub_type
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