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Age-dependent tolerance to an endogenous tumor-associated antigen.

ABSTRACT: Immunologic tolerance to endogenous antigens reduces antitumor responses. Gp70 is an endogenous tumor-associated antigen (TAA) of the BALB/c-derived colon carcinoma CT26. We found that expression of gp70 mRNA is detectable in tissues of mice 8 months of age and older. We showed that expression of gp70 establishes immunologic tolerance and affects antitumor immunity in a similarly age-dependent manner using gp70-deficient mice. We found that tumors grew in all gp70-sufficient mice, while approximately half of gp70-deficient mice controlled tumor growth with endogenous T-cell responses. Protection in gp70-deficient mice correlated with more robust gp70-specific CTL responses, and increased numbers and avidity of responding antigen-specific T cells after vaccination. We conclude that immunosurveillance may decline with age due to increased or de novo peripheral expression of endogenous TAAs.

SUBMITTER: McWilliams JA

PROVIDER: S-EPMC2295286 | biostudies-literature | 2008 Mar

REPOSITORIES: biostudies-literature

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Age-dependent tolerance to an endogenous tumor-associated antigen.

McWilliams Jennifer A JA Sullivan Richard T RT Jordan Kimberly R KR McMahan Rachel H RH Kemmler Charles B CB McDuffie Marcia M Slansky Jill E JE

Vaccine 20080220 15

Immunologic tolerance to endogenous antigens reduces antitumor responses. Gp70 is an endogenous tumor-associated antigen (TAA) of the BALB/c-derived colon carcinoma CT26. We found that expression of gp70 mRNA is detectable in tissues of mice 8 months of age and older. We showed that expression of gp70 establishes immunologic tolerance and affects antitumor immunity in a similarly age-dependent manner using gp70-deficient mice. We found that tumors grew in all gp70-sufficient mice, while approxim ...[more]

PMID: 18329760

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