Different hypersensitivities against homologous proteins of MGL_1304 in patients with atopic dermatitis

Publication date: Available online 24 June 2017
Source:Allergology International
Author(s): Takuma Kohsaka, Takaaki Hiragun, Kaori Ishii, Makiko Hiragun, Akiko Kamegashira, Michihiro Hide
BackgroundAtopic dermatitis (AD) is exacerbated by sweating, and the skin of most patients with AD are resided by Malassezia (M.) fungi. Recently, MGL_1304 produced by Malasseziaglobosa was identified as the major histamine releasing antigen in human sweat.MethodsThe full length cDNA of the counterpart of MGL_1304 in Malasseziarestricta (Mala r 8), was cloned by degenerate PCR and rapid identification of cDNA ends (RACE). Recombinant MGL_1304, and its counterparts, Mala s 8 (produced by Malasseziasympodialis) and Mala r 8 were prepared, and compared in their allergenicities by dot blot analysis and histamine release tests with sera and basophils of patients with AD.ResultsThe identities between MGL_1304 and Mala s 8, MGL_1304 and Mala r 8, and Mala s 8 and Mala r 8 were 68%, 78%, and 76%, respectively, in protein sequences. Dot blot analysis revealed that the level of IgE binding to Mala s 8 was higher than that of MGL_1304. However, histamine release tests revealed that MGL_1304 and Mala r 8 possessed higher activity than Mala s 8. In addition, the crude lysate of M. globosa showed higher histamine release ability than that of M. sympodialis.ConclusionsPatients with AD showed hypersensitivities against MGL_1304 and its homologs. However, the allergenicities of the homologs are variable and the histamine release activities may be different from the solid-phase binding activities for IgE. Sweat allergy should be carefully evaluated with biological activities of MGL_1304 and its homologs of other Malassezia fungi residing on the skin.



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