Rice allergy demonstrated by double-blind placebo-controlled food challenge in peach-allergic patients is related to lipid transfer protein reactivity.

Abstract

BACKGROUND:

The risk factors for sensitisation to rice and the involved allergens are still partially unknown. In this study we evaluated the clinically relevant aspects of rice allergy in DBPCF-positive patients, the major rice allergens, the severity of peach- and rice-induced symptoms in respect to Pru p 3 sensitisation and the role of anti-rPru p 3 IgE levels as a risk factor for rice allergy.

METHODS:

In 148 peach-allergic subjects, patients with allergic reactions to rice and rice-positive serum IgE were selected. Symptoms were verified by double-blind placebo-controlled food challenges (DBPCFCs), performed at a maximum dosage of 25 g. Rice allergens, identified by IgE immunoblotting, were characterised by N-terminal amino acid sequencing. The relationship between anti-rPru p 3, 1 and 4 IgE levels and rice symptoms were statistically analysed.

RESULTS:

Eight out of 10 recruited rice-allergic patients had positive DBPCFCs, while 2 patients were not challenged due to their previously documented severe reactions. All patients with rice-induced symptoms were Pru p 3 positive and presented with higher anti-rPru p 3 levels than the rice-sensitised but tolerant patients. A 9-kDa lipid transfer protein, which was highly homologous to Pru p 3, was identified as the major rice allergen and elicited a positive response in all of the patients. Five patients reacted to a putative 15- to 17-kDa rice allergenic protein, and 3 patients reacted to an [alpha]-amylase/subtilisin inhibitor that was approximately 20 kDa.

CONCLUSION:

Rarely, allergic reactions to rice can arise in patients with peach allergies who are sensitised to Pru p 3, particularly in patients with high anti-rPru p 3 IgE levels.

• Authors: Elide Anna Pastorello, Joseph Scibilia, Laura Farioli, Laura Primavesi, Maria Gabriella Giuffrida, Ambra Mascheri, Marta Piantanida, Corrado Mirone, Chrysi Stafylaraki, Marta Riva Violetta, Michele Nichelatti, Donatella Preziosi, Laura Losappio, Valerio Pravettoni
• Journal: International archives of allergy and immunology (Int Arch Allergy Immunol) Vol. 161 Issue 3 Pg. 265-73 ( 2013) ISSN: 1423-0097 [Electronic] Switzerland
• PMID: 23548503 (Publication Type: Journal Article)
• Copyright: Copyright © 2013 S. Karger AG, Basel.

Chemical References

• Carrier Proteins
• Plant Preparations
• Plant Proteins
• lipid transfer protein
• Immunoglobulin E

Topics

• Adult
• Carrier Proteins (chemistry, genetics, immunology)
• Chromatography, High Pressure Liquid
• Double-Blind Method
• Electrophoresis, Polyacrylamide Gel
• Female
• Food Hypersensitivity (immunology)
• Humans
• Immunoblotting
• Immunoglobulin E (blood)
• Male
• Middle Aged
• Oryza (immunology)
• Plant Preparations (immunology)
• Plant Proteins (immunology)
• Prunus (immunology)
• Surveys and Questionnaires