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Journal of Virology, April 2000, p. 3427-3429, Vol. 74, No. 7
Department of Pathology and Laboratory
Medicine, University of Pennsylvania, Philadelphia,
Pennsylvania1; Henry M. Jackson
Foundation, Rockville, Maryland2;
Primedica Mason Laboratories, Worcester,
Massachusetts3; and Department of
Medical Microbiology and Immunology, University of South Florida,
Tampa, Florida4
Received 11 October 1999/Accepted 22 December 1999
An important limitation of DNA immunization in nonhuman primates is
the difficulty in generating high levels of antigen-specific antibody
responses; strategies to enhance the level of immune responses to DNA
immunization may be important in the further development of this
vaccine strategy for humans. We approached this issue by testing the
ability of molecular adjuvants to enhance the levels of immune
responses generated by multicomponent DNA vaccines in rhesus macaques.
Rhesus macaques were coimmunized intramuscularly with expression
plasmids bearing genes encoding Th1 (interleukin 2 [IL-2] and gamma
interferon)- or Th2 (IL-4)-type cytokines and DNA vaccine constructs
encoding human immunodeficiency virus Env and Rev and simian
immunodeficiency virus Gag and Pol proteins. We observed that the
cytokine gene adjuvants (especially IL-2 and IL-4) significantly
enhanced antigen-specific humoral immune responses in the rhesus
macaque model. These results support the assumption that
antigen-specific responses can be engineered to a higher and presumably
more desirable level in rhesus macaques by genetic adjuvants.
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Modulation of Antigen-Specific Humoral Responses in Rhesus
Macaques by Using Cytokine cDNAs as DNA Vaccine Adjuvants

*
Corresponding author. Mailing address: Department of
Pathology and Laboratory Medicine, University of Pennsylvania,
Philadelphia, PA 19104. Phone: (215) 349-8365. Fax: (215) 573-9436.
Present address: Merck Research Laboratories, West Point, PA 19486.
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