Immunogenicity, safety, biodistribution and persistence of ADVAX, a prophylactic DNA vaccine for HIV-1, delivered by in vivo electroporation.

Abstract:

:ADVAX is a DNA-based candidate HIV vaccine that was safe but weakly immunogenic when delivered intramuscularly (IM) in humans. Studies were performed in animal models to determine whether an alternative delivery method, in vivo electroporation (EP), could improve the immunogenicity of ADVAX while maintaining an acceptable safety profile. Immunization of mice with ADVAX with or without EP at weeks 0, 3, and 6, revealed significantly higher gamma interferon ELISpot responses to all antigens in the EP groups. Antigen-specific CD4+ and CD8+ T cell responses, as quantified by intracellular cytokine staining, both improved significantly with EP. Evaluation of repeat-dose toxicity of ADVAX-EP in rabbits did not reveal any safety concerns. Biodistribution studies of ADVAX delivered IM and with EP in rats indicated that the vaccine was localized predominantly to the administration site in both groups. PCR-based quantitation of residual plasmid at Day 60 indicated that the potential for integration events into the host genome was low for both IM and EP delivery. Taken together, these data supported the clinical development of ADVAX delivered with EP in human volunteers.

journal_name

Vaccine

journal_title

Vaccine

authors

Dolter KE,Evans CF,Ellefsen B,Song J,Boente-Carrera M,Vittorino R,Rosenberg TJ,Hannaman D,Vasan S

doi

10.1016/j.vaccine.2010.11.011

subject

Has Abstract

pub_date

2011-01-17 00:00:00

pages

795-803

issue

4

eissn

0264-410X

issn

1873-2518

pii

S0264-410X(10)01617-8

journal_volume

29

pub_type

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