Clinical and Laboratory Investigation of Oral Allergy Syndrome to Grape


Oral allergy syndrome (OAS) is occasionally observed following consumption  of raw fruits  in  allergic adults. Since this  phenomenon  was  commonly  reported  in  Khorasan province of Iran; we intended to check if common  diagnostic tests could be applied for differential diagnosis of OAS to grapes.
IgE reactivity of 84 patients with OAS to grape and 34 patients with OAS to other fruits were analyzed by in vivo and in vitro methods, and the results were compared with those of controls. The patients underwent skin prick test (SPT) with common allergic pollen extracts as well as grape extract. The specific IgE  level to grape proteins was determined by an indirect ELISA. The correlation of SPT results with ELISA and western blotting patterns was checked by statistical methods.
The results showed a significant correlation of grape SPT diameters with grape specific IgE levels. Furthermore,  a significant association of grape SPT results with IgE immunoreactivity of a 10 kDa  grape protein,  probably lipid transfer protein  (LTP) was prominent. Immunoreactivity of other proteins was linked with mild clinical symptoms.
The study showed a significant correlation of grape SPT results with grape total extract, as well as its 10 kDa component’s IgE reactivity. The results suggested that OAS to grape should not be considered as a main criterion in diagnosis of grape allergy and a combination of grape SPT results with evaluation of IgE reactivity to grape 10 kDa allergen should be considered to achieve a more reliable grape allergy diagnosis.

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IssueVol 11, No 2 (2012) QRcode
Food hypersensitivity Grape (Vitis vinifera) Lipid transfer protein Oral allergy syndrome Skin prick test Specific IgE Western blotting

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How to Cite
Falak R, Sankian M, Tehrani M, Jabbari Azad F, Abolhasani A, Varasteh A. Clinical and Laboratory Investigation of Oral Allergy Syndrome to Grape. Iran J Allergy Asthma Immunol. 1;11(2):147-155.