Retrovirus-mediated gene transfer of B7-1 and MHC class II converts a poorly immunogenic neuroblastoma into a highly immunogenic one.

Abstract:

:The T cell co-stimulatory molecule B7-1 was transduced into a poorly immunogenic murine neuroblastoma cell line (Neuro-2a, N-2a) alone or in combination with MHC class II genes to test the ability of these genes to stimulate antitumor immunity. N-2a cells transduced with B7-1 exhibited reduced tumorigenicity, whereas N-2a cells overexpressing both MHC class II (syngeneic, I-Ak) and B7-1 totally abrogated tumorigenicity. Rejection of I-Ak/B7-1 cells was dependent on both CD4+ and CD8+ T cells. The ability of both vaccines to induce protection against parental N-2a was temporally dependent on the time of secondary N-2a challenge. To investigate the immunity generated by N-2a/B7-1 and N-2a/I-Ak/B7-1 vaccines, we tested the ability of these modified cells to stimulate in vitro the proliferation of syngeneic splenocytes from naive mice. A significant increase in splenocyte proliferation was observed with N-2a/I-Ak/B7-1 cells compared to N-2a cells. We also determined that vaccination with N-2a/I-Ak/B7-1 cells was able to generate cytotoxic T cell responses to unmodified N-2a cells. The introduction of B7-1 and I-Ak into N-2a was able to convert a poorly immunogenic tumor to a highly immunogenic one; however, mice bearing large established unmodified tumors had little response to vaccination with N-2a/I-Ak/B7-1 cells. Our results emphasize the importance of tumor immunogenicity in the treatment of established tumors with MHC class II/B7-1 tumor cell vaccines.

journal_name

Hum Gene Ther

journal_title

Human gene therapy

authors

Heuer JG,Tucker-McClung C,Gonin R,Hock RA

doi

10.1089/hum.1996.7.17-2059

subject

Has Abstract

pub_date

1996-11-10 00:00:00

pages

2059-68

issue

17

eissn

1043-0342

issn

1557-7422

journal_volume

7

pub_type

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