Abstract
Histoplasma capsulatum yeast cells have been studied by immunoelectron microscopy using rabbit polyclonal antisera and a biotin-avidin-peroxidase detection system. An antigenic surface layer has been visualized in the cell wall of immunostained organisms. This layer was not seen in samples prepared by standard electron microscopic methods or in negative controls used with the immunocytochemical technique. Without immunostaining the cell wall ofHistoplasma appeared almost transparent. In contrast, after immunoperoxidase staining the cell wall was conspicuous, bounded by the darkly stained outer layer. This electron dense layer, appeared to be a reservoir of surface antigens that were recognized by anti-Histoplasma antibodies.
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Abbreviations
- CHHA:
-
Cystine-heart-hemoglobin agar
- PBS:
-
phosphate buffered saline
- Ig:
-
immunoglobulin
- TBS:
-
Tris buffered saline
- DAB:
-
3,3′-diaminobenzidine tetrachloride
- FITC:
-
fluorescein isothiocyanate
- M199:
-
tissue culture medium 199, according to Morgan et al. (1950)
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Edwards, M.R., Fritz, K.E. Detection of an antigenic cell wall layer inHistoplasma capsulatum . Arch. Microbiol. 142, 242–247 (1985). https://doi.org/10.1007/BF00693397
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DOI: https://doi.org/10.1007/BF00693397