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The Adjuvant Activity of Mycobacterial Rna Preparations and Synthetic Polynucleotides for Induction of Delayed Hypersensitivity to Purified Protein Derivative in Guinea Pigs

Conrad H. Casavant and Guy P. Youmans
J Immunol March 1, 1975, 114 (3) 1014-1022;
Conrad H. Casavant
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Guy P. Youmans
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Abstract

The adjuvant activity of mycobacterial RNA and synthetic polynucleotides for the induction of delayed hypersensitivity to PPD was determined. It was shown that when mycobacterial RNA or synthetic polynucleotides are injected together with purified protein derivative (PPD), delayed hypersensitivity to PPD developed as compared to no detectable delayed response when PPD was administered alone without adjuvant into guinea pigs. Four different criteria were employed to detect delayed hypersensitivity responses. These were the time, appearance, and magnitude of dermal reactions, histologic examination of dermal sections, passive transfer of sensitivity with sensitized spleen cells and the elaboration of migration inhibitory factor (MIF) by sensitized spleen cells.

When synthetic polynucleotides were used as adjuvants and were injected into guinea pigs in combination with PPD, dermal reactions as well as MIF assays gave evidence that these animals exhibited delayed-type hypersensitivity. Poly U alone exhibited adjuvant activity for induction of delayed hypersensitivity to PPD. Trypsin and pronase treatment did not affect the adjuvant activity of mycobacterial RNA whereas KOH treatment completely abolished any adjuvant effect, suggesting that ribosomal protein did not contribute to the adjuvant characteristics of mycobacterial RNA. Titration experiments indicated that the adjuvant activity of mycobacterial RNA was greater than that of poly A:U.

Footnotes

  • ↵1 This investigation was supported by Public Health Service Research Grant AI-01636 from the National Institute of Allergy and Infectious Diseases.

  • Received August 7, 1974.
  • Copyright © 1975 by The American Association of Immunologists, Inc.

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The Journal of Immunology
Vol. 114, Issue 3
1 Mar 1975
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The Adjuvant Activity of Mycobacterial Rna Preparations and Synthetic Polynucleotides for Induction of Delayed Hypersensitivity to Purified Protein Derivative in Guinea Pigs
Conrad H. Casavant, Guy P. Youmans
The Journal of Immunology March 1, 1975, 114 (3) 1014-1022;

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The Adjuvant Activity of Mycobacterial Rna Preparations and Synthetic Polynucleotides for Induction of Delayed Hypersensitivity to Purified Protein Derivative in Guinea Pigs
Conrad H. Casavant, Guy P. Youmans
The Journal of Immunology March 1, 1975, 114 (3) 1014-1022;
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