Journal of Virology, December 1999, p. 10416-10425, Vol. 73, No. 12
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Departments of
Surgery1 and Molecular Genetics and
Biochemistry,
Received 23 June 1999/Accepted 24 August 1999
Epstein-Barr virus (EBV) is a herpesvirus commonly associated with
several malignancies, particularly in immunocompromised hosts. As a
strategy for stimulating immunity against EBV for the treatment of
EBV-associated tumors, we have genetically engineered dendritic cells
(DC) to express EBV antigens, such as latent membrane protein 2B
(LMP2B), using recombinant adenovirus vectors. CD8+ T
lymphocytes from HLA-A2.1+, EBV-seropositive healthy donors
were cultured with autologous DC infected with recombinant adenovirus
vector AdEGFP, encoding an enhanced green fluorescent protein (EGFP),
or AdLMP2B at a multiplicity of infection of 250. After 48 h,
>95% of the DC were positive for EGFP expression as assessed by
fluorescence-activated cell sorting analysis, indicating efficient gene
transfer. AdLMP2-transduced DC were used to stimulate CD8+
T cells. Responder CD8+ T cells were tested for gamma
interferon (IFN-
) release by enzyme-linked spot (ELISPOT) assay and
cytotoxic activity. Prior to in vitro stimulation, the frequencies of
T-cells directed against two HLA-A2-presented LMP2 peptides (LMP2
329-337 and LMP2 426-434) were very low as assessed by IFN-
spot
formation (T-cell frequency, <0.003%). IFN-
ELISPOT assays
performed at day 14 showed a significant (2-log) increase of the day 0 frequency of T cells reactive against the LMP2 329-337 peptide, from
0.003 to 0.3 (P < 0.001). Moreover, specific
cytolytic activity was observed against the autologous EBV
B-lymphoblastoid cell lines after 21 days of stimulation of T-cell
responders with AdLMP2-transduced DC (P < 0.01). In
summary, autologous mature DC genetically modified with an adenovirus
encoding EBV antigens stimulate the generation of EBV-specific
CD8+ effector T cells in vitro, supporting the potential
application of EBV-based adenovirus vector vaccination for the
immunotherapy of the EBV-associated malignancies.
*
Corresponding author. Mailing address: University of
Pittsburgh School of Medicine, Department of Surgery, W1555 Biomedical Science Tower, 200 Lothrop St., Pittsburgh, PA 15261. Phone: (412) 624-6453. Fax: (412) 624-1172. E-mail:
storkuswj{at}msx.upmc.edu.
This article has been cited by other articles:
| J. Bacteriol. | Mol. Cell. Biol. | Microbiol. Mol. Biol. Rev. |
|---|
| Clin. Vaccine Immunol. | ALL ASM JOURNALS |
|---|