Immunochemical comparison of the allergenic potency of spores and mycelium of cladosporium cladosporioides extracts by a nitrocellulose electroblotting technique

Background: The lack of well standardized or characterized extracts that contain the relevant allergens of the appropriate fungus is resulting in a high heterogeneity of the commercial preparation. Material and methods: Immunochemical detection of the allergens composition of spore and mycelium of C. cladosporioides was studied by electroblotting using sera from Cladosporium allergic patients and 125 I- anti- human IgE. A MW range of allergens between 16 to 88 KDa was identified. The most important with a MW of 16, 20, 30, 39, 43, 50, 60 and 88 KDa. Results: The allergenic composition of spore and mycelium looked very similar. However, partial or total inhibition of the serum with a conidial or mycelial extract demonstrated that the total concentration of allergens (particulary 20 and 60 KDa molecules) was higher in the conidium than in the mycelium. Conclusions: These results indicated that conidium and mycelium contained the same allergenic determinants but at different concentration in the two propagule. Results with 50% inhibited sera demonstrated also that the total concentration of allergens was higher in the conidium than in the mycelium.