A polymeric conjugate foreignizing tumor cells for targeted immunotherapy in vivo.

Abstract

Antigen-specific CD8(+) cytotoxic T lymphocytes (CTLs) are key elements of immunological rejection in transplantation as well as cancer immunotherapy. Most tumors, however, are not immunologically rejected because they have self antigens, which are not recognized as the foreigner by CTLs. In this study, we hypothesized that "foreignizing" tumor cells by delivering non-self foreign antigens into the tumors would result in rejection by foreign antigen-reactive CTLs. As the model system to foreignize the tumors, we prepared a polymeric conjugate consisting of hyaluronic acid as the CD44(+) tumor-targeting ligand and ovalbumin (OVA) as a foreign antigen. When the conjugate was treated with CD44(high) TC-1 tumor cells, it was effectively taken up and allowed for displaying of antigenic OVA257-264 peptide at MHC class I on the surface of the cells. In addition, the conjugate was effectively accumulated into tumor tissue after its systemic administration to mice which are immunized with a vaccine for a vaccinia virus expressing OVA to generate OVA257-264 specific CTLs, resulting in substantial inhibition of tumor growth. Overall, these results suggest that the polymeric conjugates bearing foreign antigens may be innovative and promising cancer immunotherapeutic agents by foreignizing tumor cells, leading to immunological rejection.

• Authors: Young-Ho Lee, Hong Yeol Yoon, Jung Min Shin, G Saravanakumar, Kyung Hee Noh, Kwon-Ho Song, Ju-Hong Jeon, Dong-Wan Kim, Kyung-Mi Lee, Kwangmeyung Kim, Ick Chan Kwon, Jae Hyung Park, Tae Woo Kim
• Journal: Journal of controlled release : official journal of the Controlled Release Society (J Control Release) Vol. 199 Pg. 98-105 (Feb 10 2015) ISSN: 1873-4995 [Electronic] Netherlands
• PMID: 25499555 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2014 Elsevier B.V. All rights reserved.

Chemical References

• Hyaluronan Receptors
• Polymers
• Hyaluronic Acid
• Ovalbumin

Topics

• Animals
• Antigen Presentation
• Apoptosis (drug effects)
• Drug Delivery Systems (methods)
• Female
• Foreign Bodies (immunology)
• Genes, MHC Class I (immunology)
• Hyaluronan Receptors (immunology)
• Hyaluronic Acid
• Immunotherapy (methods)
• Mice
• Mice, Inbred C57BL
• Neoplasms, Experimental (therapy)
• Ovalbumin (immunology)
• Polymers
• T-Lymphocytes, Cytotoxic (immunology)
• Tissue Distribution
• Vaccinia virus (immunology)