alexa Isolation and morphology of an immunoreactive outer wall fraction produced by spherules of Coccidioides immitis.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Cole GT, Seshan KR, Franco M, Bukownik E, Sun SH,

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Abstract A previously undescribed, immunoreactive, membranous spherule outer wall (SOW) fraction produced by Coccidioides immitis (strains 634 and 735) grown in culture was isolated. Both this fraction and intact spherules were reactive with sera from coccidioidomycosis patients, as demonstrated by immunofluorescence microscopy. The serological activity of SOW was also demonstrated by its reactivity with human anti-C. immitis tube precipitin in a standardized immunodiffusion assay. Extraction of SOW with the nonionic detergent N-octyl-beta-D-glucopyranoside (OG) permitted the isolation of an OG-soluble fraction which was reactive in the immunodiffusion assay. Rabbit antisera raised against the OG-soluble fraction were used in immunofluorescence and immunoelectron-microscopic studies of the parasitic cycle to confirm that the immunoreactive components of the solubilized fraction of SOW were associated with the inner and outer layers of the spherule wall as well as with distinct cytoplasmic organelles observed in thin sections of spherules. The immunoreactivity of SOW with sera from patients suggested that infected individuals are exposed to this surface wall material isolated from in vitro-grown spherules.
This article was published in Infect Immun and referenced in Journal of Clinical & Cellular Immunology

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