Antigenicity ofCandida tropicalisstrain cells cultured at 27 and 37°C

Abstract

All cells of four Candida tropicalis strains IFO 0199 (Ct-0199), IFO 0587 (Ct-0587), IFO 1400 (Ct-1400), and IFO 1647 (Ct-1647), obtained by cultivation at 27 and 37 degrees C for 48 h in yeast extract-added Sabouraud liquid medium, showed the shapes of typical budding yeast and the same agglutination patterns against factor sera 1, 4, 5 and 6 in the commercially available kit 'Candida Check'. The cells of the C. tropicalis IFO 0589 strain display the same properties at 27 degrees C but formed hyphae at 37 degrees C. The cell wall mannan (Ct-0589-37-M) obtained from the strain cells cultured at 37 degrees C had lost most of its reactivity against factor sera 4, 5 and 6 in an enzyme-linked immunosorbent assay, in contrast to the mannan (Ct-0589-27-M) at 27 degrees C. The 1H-nuclear magnetic resonance patterns of the mannans obtained from the cells of the four C. tropicalis strains IFO 0199, IFO 0587, IFO 1400, and IFO 1647, obtained by cultivation at 37 degrees C, did not change compared to those at 27 degrees C. By contrast, the Ct-0589-37-M had significantly lost the beta-1,2-linked mannopyranose units, corresponding to the serum factors 5 and 6. These results show that the IFO 0589 strain is an unusual strain among the general C. tropicalis strains studied.