Expression of co-stimulatory molecules by tumor cells decreases tumorigenicity but may also reduce systemic antitumor immunity

Heung Chong, Gill Hutchinson, Ian R. Hart, Richard Geoffrey Vile

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Many tumor cells do not express co-stimulatory molecules, and this may account, in part, for their poor ability to stimulate T cells directly. One strategy to enhance immune recognition would be to express such molecules on the tumor cell. Here, we show that expression of a member of the B7 family of co-stimulatory molecules by CMT93 murine colorectal tumor or 1735 murine melanoma cells resulted in a local antitumor response in immunocompetent mice. The antitumor effect was diminished in athymic nude mice, indicating that T cells played an important part in this response. The ability of the B7-expressing tumor cells to generate systemic protective immunity was investigated by excision of tumors that developed from the initial inoculation followed by rechallenge with parental tumor cells. CMT93 is a poorly immunogenic tumor and no significant systemic immunity was elicited by the expression of B7-1 in these cells. 1735 melanoma is a mildly immunogenic tumor. Unexpectedly, the systemic immunity obtained with 1735 tumors expressing B7-1 or B7-2 was weaker than that generated by parental 1735 cells (p < 0.001, stratified logrank test), even when co-expression of interferon-γ in the B7-1 cells produced high levels of surface MHC class I expression. These results suggest that some caution is appropriate when considering the use of these molecules in the gene therapy of cancer.

Original languageEnglish (US)
Pages (from-to)1771-1779
Number of pages9
JournalHuman Gene Therapy
Volume7
Issue number14
StatePublished - Sep 10 1996
Externally publishedYes

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Immunity
Neoplasms
Aptitude
Nude Mice
Melanoma
T-Lymphocytes
Genetic Therapy
Interferons
Colorectal Neoplasms

ASJC Scopus subject areas

  • Genetics

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Expression of co-stimulatory molecules by tumor cells decreases tumorigenicity but may also reduce systemic antitumor immunity. / Chong, Heung; Hutchinson, Gill; Hart, Ian R.; Vile, Richard Geoffrey.

In: Human Gene Therapy, Vol. 7, No. 14, 10.09.1996, p. 1771-1779.

Research output: Contribution to journalArticle

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