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. 1974 Nov;10(5):1091–1097. doi: 10.1128/iai.10.5.1091-1097.1974

Immunogenicity of Ribosomal Preparations from Yeast Cells of Histoplasma capsulatum

Carl Feit 1, Ram P Tewari 1
PMCID: PMC423067  PMID: 16558095

Abstract

Protective immunity was elicited by immunization of mice with ribosomal preparations from yeast cells of Histoplasma capsulatum. Ribosomes from disrupted cells were isolated by differential centrifugation using sodium dodecyl sulfate. These preparations contained 55% protein and 45% ribonucleic acid and sedimented as a single peak with a sedimentation coefficient of 77S on sucrose density gradient analysis. Mice immunized subcutaneously with ribosomes, with or without adjuvant, were challenged intravenously with 8 × 106 yeast cells of H. capsulatum. Significant protection was induced by ribosomes and was greatly enhanced by adjuvants. Protection measured by 30-day survival compared favorably with the immunoprotection assessed by absence of lung lesions and negative spleen cultures. Treatment of ribosomes with ribonuclease before immunization reduced protection by 85%, whereas trypsin and Pronase reduced the protection by 50 to 55%. These findings indicate that both intact ribosomal ribonucleic acid and protein are necessary for maximal immunogenicity of Histoplasma ribosomes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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