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Title: Allergenicity of native/recombinant tropomyosin, Per a 7, of American cockroach (CR), Periplaneta americana, among CR allergic thais
Authors: Nitat Sookrung
Nitaya Indrawattana
Anchalee Tungtrongchitr
Chaweewan Bunnag
Pongsakorn Tantilipikorn
Sukanya Kwangsri
Wanpen Chaicumpa
Mahidol University
Keywords: Immunology and Microbiology;Medicine
Issue Date: 3-Aug-2009
Citation: Asian Pacific Journal of Allergy and Immunology. Vol.27, No.1 (2009), 9-17
Abstract: In this study, native tropomyosin (Per a 7) of American cockroach (CR), Periplaneta americana, caught in Thailand was purified. Also, gene sequence encoding full length tropomyosin of the CR was PCR amplified by using degenerate primers designed from gene sequences coding for P. americana tropomyosin of the database (Per a 7.0101 and Per a 7.0102; accession no.Y14854 and AF106961, respectively). Amino acid sequence deduced from the nucleotide sequence encoding P. americana tropomyosin of this study (GenBank accession no. FJ976895) had 98.59% identity with the sequences of Per a 7.0101 and Per a 7.0102 and was 97.18% identical to the Bla g 7 sequence of German cockroach, Blatella germanica (accession no. AF260897). The native and recombinant tropomyosins (∼34 kDa) were used as antigens in sandwich ELISA for detecting specific IgE in serum samples of 14 consented allergic patients who were positive by skin test to crude CR extract in comparison to 5 individuals who were skin test negative. It was found that 8 (57%) and 6 (43%) of the CR allergic patients gave positive IgE binding results to the native and the recombinant proteins, respectively, while none of the non-allergic counterparts was positive. Results of immunoblotting conformed to the ELISA results. Tropomyosin extracted from the P. americana caught in Thailand has potential as standard P. americana allergen in clinical monitoring of the allergic Thai patients.
ISSN: 0125877X
Appears in Collections:Scopus 2006-2010

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