NDLI: Dendritic Cells Retrovirally Transduced with a Model Antigen Gene Are Therapeutically Effective against Established Pulmonary Metastases

Content Provider	PubMed Central
Author	Specht, Jennifer M. Wang, Gang Do, My T. Lam, John S. Royal, Richard E. Reeves, Mark E. Rosenberg, Steven A. Hwu, Patrick
Copyright Year	1997
Abstract	Dendritic cells (DCs) are bone marrow–derived leukocytes that function as potent antigen presenting cells capable of initiating T cell–dependent responses from quiescent lymphocytes. DC pulsed with tumor-associated antigen (TAA) peptide or protein have recently been demonstrated to elicit antigen-specific protective antitumor immunity in a number of murine models. Transduction of DCs with TAA genes may allow stable, prolonged antigen expression as well as the potential for presentation of multiple, or unidentified, epitopes in association with major histocompatibility complex class I and/or class II molecules. To evaluate the potential efficacy of retrovirally transduced DCs, bone marrow cells harvested from BALB/c mice were transduced with either a model antigen gene encoding β-galactosidase (β-gal) or a control gene encoding rat HER-2/neu (Neu) by coculture with irradiated ecotropic retroviral producer lines. Bone marrow cells were differentiated into DC in vitro using granulocyte/macrophage colony-stimulating factor and interleukin-4. After 7 d in culture, cells were 45–78% double positive for DC phenotypic cell surface markers by FACS® analysis, and DC transduced with β-gal were 41–72% positive for β-gal expression by X-gal staining. In addition, coculture of β-gal transduced DC with a β-gal–specific T cell line (CTLx) resulted in the production of large amounts of interferon-γ, demonstrating that transduced DCs could process and present endogenously expressed β-gal. DC transduced with β-gal and control rat HER-2/neu were then used to treat 3-d lung metastases in mice bearing an experimental murine tumor CT26.CL25, expressing the model antigen, β-gal. Treatment with β-gal–transduced DC significantly reduced the number of pulmonary metastatic nodules compared with treatment with Hank's balanced salt solution or DCs transduced with rat HER-2/neu. In addition, immunization with β-gal–transduced DCs resulted in the generation of antigen-specific cytotoxic T lymphocytes (CTLs), which were significantly more reactive against relevant tumor targets than CTLs generated from mice immunized with DCs pulsed with the Ld-restricted β-gal peptide. The results observed in this rapidly lethal tumor model suggest that DCs transduced with TAA may be a useful treatment modality in tumor immunotherapy.
Starting Page	1213
File Format	PDF
ISSN	15409538
e-ISSN	15409538
Journal	The Journal of Experimental Medicine
Issue Number	8
Volume Number	186
Language	English
Publisher	The Rockefeller University Press
Publisher Date	1997-10-20
Access Restriction	Open
Rights Holder	The Rockefeller University Press
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Immunology and Allergy Immunology

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