Allergen cross‐reactivity between Pityrosporum orbiculare and Candida albicans

Pityrosporum orbiculare and Candida albicans extracts were separated bySDS‐PAGE, and IgE binding was detected by immunoblotting with 21 patient sera that were RAST positive to both yeasts. Cross‐wise inhibition was performed of IgE binding of a serum pool containing IgE antibodies to both yeasts. The pool was mixed with serial dilutions of P. orbiculare or C. albicans extracts, and incubated with strips containing separated allergen. IgE binding was quantified by densitometric scanning and percent inhibition was calculated as well as the respective ratios between required extract concentration for 50% inhibition in heterologous compared to homologous inhibition for each component ‘inhibition ratio). Ten componentsof P. orbiculare were detected by more than 60% of the sera. IgE binding toC. albicans was weak, and only to four bands was IgE binding detected by more than 30% of the sera. The most important C. albicans allergen was a 48‐kDa band, to which IgE of half of the patient sera bound. There was little inhibition of IgE binding to P. orbiculare with C. albicans. Thus, all but three components exhibited an inhibition ratio higher than 100.The inhibition ratio of the 48‐kDa C. albicans compound was 50, thus indicating some degree of cross‐reactivity. Significant cross‐reactivity was shown by C. albicans compounds of 18, 24, 26, 34, and 38 kDa, the inhibition ratios of which were less than 10. There was some degree of cross‐reactivity between apparent protein allergens of the two yeasts, but IgE antibodies to C. albicans donot merely reflect sensitization to P. orbiculare.

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