Medical Oncology

, Volume 29, Issue 4, pp 2923–2931 | Cite as

Anti-Sp17 monoclonal antibody with antibody-dependent cell-mediated cytotoxicity and complement-dependent cytotoxicity activities against human ovarian cancer cells

  • Jia-xi Song
  • Wang-li Cao
  • Fang-qiu LiEmail author
  • Li-ning Shi
  • Xuan Jia
Original Paper


Sperm protein 17 (Sp17) is a cancer testis antigen that has been shown to be overexpressed in a variety of gynecologic malignancies, in particular ovarian cancer. Emerging evidences indicate that Sp17 is involved in tumorigenesis and in the migration of malignant cells. It has been proposed as a useful target for tumor-vaccine strategies and a novel marker to define tumor subsets and predict drug response. However, the antitumor activity of anti-Sp17 monoclonal antibody (anti-Sp17 mAb) has not been investigated. In this study, the in vitro cytotoxicity, antibody-dependent cell-mediated cytotoxicity (ADCC) and complement-dependent cytotoxicity (CDC) activities of anti-Sp17 mAb were evaluated using Sp17-positive ovarian cancer cells as targets, Sp17-negative ovarian cancer cells as the control, and healthy human peripheral blood monocytes and healthy human serum as effectors. Our preliminary results indicate that the direct cytotoxicity of anti-Sp17 mAb against the investigated ovarian cancer cells was very weak. However, the cytotoxicity of anti-Sp17 mAb, mediated by peripheral blood mononuclear cells (PBMCs), as ADCC, or by human serum, as CDC, was relatively strong in the Sp17-positive ovarian cancer cells. This finding suggested that anti-Sp17 mAb could be a useful tool against ovarian cancer and may provide insight into the development of low side-effect targeting therapy for this malignant disease.


Anti-Sp17 monoclonal antibody Antibody-dependent cell-mediated cytotoxicity Complement-dependent cytotoxicity Ovarian cancer 



Sperm protein 17

Anti-Sp17 mAb

Anti-Sp17 monoclonal antibody


Antibody-dependent cell-mediated cytotoxicity activity


Complement-dependent cytotoxicity


Cancer testis antigen


Cytotoxic T lymphocytes


Peripheral blood monocytes


Membrane complement regulatory proteins


Membrane attack complex



The authors appreciate Liu Qi, PhD for the gift of SKOV3 and COC2 human ovary carcinoma cell lines. Funding support: This work was supported by a grant from National Nature Science Foundation of China (No. 81101978).

Conflict of interests

The authors declare that they have no conflict of interests.


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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Jia-xi Song
    • 1
  • Wang-li Cao
    • 1
  • Fang-qiu Li
    • 1
    Email author
  • Li-ning Shi
    • 1
  • Xuan Jia
    • 1
  1. 1.Laboratory of Molecular Biology, Institute of Medical Laboratory Sciences, Jinling Hospital, School of MedicineNanjing UniversityNanjingPeople’s Republic of China

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