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Sperm-associated antigens as targets for cancer immunotherapy: expression pattern and humoral immune response in

Karīna Siliņa1, Pavel Zayakin, Zane Kalniņa

  • 1Latvian Biomedical Research and Study Centre, Riga, Latvia. karina@biomed.lu.lv

Journal of Immunotherapy (Hagerstown, Md. : 1997)
|December 15, 2010
PubMed

Insights

Sperm-associated antigens (SPAG) are potential cancer-testis (CT) antigens. SPAG1, SPAG6, SPAG8, and SPAG17 variants show tumor expression and immune responses, making them promising targets for cancer immunotherapy.

Area of Science:

  • Immunology
  • Oncology
  • Genetics

Background:

  • Identifying novel cancer-related and immunogenic proteins is crucial for advancing antigen-specific tumor immunotherapy.
  • Cancer-testis (CT) antigens are promising targets for activating anticancer immune responses due to their restricted expression in normal tissues and aberrant presence in tumors.
  • Sperm-associated antigens (SPAG) represent a potential source of novel CT antigens, given their expression in male germ cells, immunogenicity, and proposed oncogenic roles.

Purpose of the Study:

  • To comprehensively analyze the expression patterns of SPAG proteins across various normal and cancerous tissues.
  • To assess the frequency of spontaneous humoral immune responses against SPAG members in cancer patients.
  • To identify novel SPAG proteins with characteristics of CT antigens for potential use in cancer immunotherapy and diagnostics.

Main Methods:

  • Phage-displayed antigen microarrays were employed to screen for humoral immune responses against SPAG proteins in cancer patients.
  • Comprehensive analysis of SPAG gene expression patterns in normal and cancerous tissues was performed.
  • Immunohistochemical analysis was used to validate the upregulation of SPAG6 in lung and breast cancer tissues.

Main Results:

  • Only SPAG1, SPAG6, SPAG8, SPAG15, and SPAG17 were predominantly expressed in the testis among the 15 analyzed SPAG genes.
  • SPAG1, SPAG6, and splice variants of SPAG8, SPAG16, and SPAG17 showed elevated mRNA expression in various tumors (10-70% frequency).
  • Spontaneous humoral immune responses were detected against SPAG1, SPAG6, SPAG8, and a novel SPAG17 splice variant in cancer patients.

Conclusions:

  • SPAG1, SPAG6, SPAG8, and a novel SPAG17 splice variant function as novel cancer-testis antigens.
  • These identified SPAG proteins are potential targets for developing immunotherapeutic strategies against cancer.
  • The identified antigens may also serve as valuable serologic biomarkers for cancer detection and monitoring.

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