Monoclonal human IgG2 antibody against human CTLA-4

Anti-hCTLA4-hIgG2 features the constant region of the human IgG2 isotype and the variable region of ipilimumab. Ipilimumab is a fully human IgG1 monoclonal antibody that targets CTLA-4 (also known as CD152), a negative regulator of T cell activation. By binding CTLA‑4, it inhibits negative signals that physiologically downregulate T cell activation and exerts its therapeutic activity by upregulating the antitumor activity of T lymphocytes [1,2]. In addition, it induces antibody‑dependent cell-mediated cytotoxicity (ADCC) and TNF-α production [3]. Ipilimumab has been approved by the FDA for the treatment of unresectable or metastatic melanoma. It is undergoing clinical trials for other types of cancers, including lung cancer [4].

Human IgG2 is the second most common antibody present in serum. This isotype is resistant to cleavage by proteolytic enzymes, due to a short hinge region. Human IgG2 displays low complement-dependent cytotoxicity (CDC) and very low antibody-dependent cell-mediated cytotoxicity (ADCC).

Anti-hCTLA4-hIgG2 was generated by recombinant DNA technology. It has been produced in CHO cells and purified by affinity chromatography with protein G.


Specificity: Targets cells expressing human CTLA-4
Monoclonal antibody
Isotype: Human IgG2
Source: CHO cells
Purity: Purified by affinity chromatography with protein G

Quality control:
- Binding of Anti-hCTLA4-hIgG2 to human CTLA-4 has been tested using flow cytometry.
- The complete sequence of this antibody has been verified.
- The absence of bacterial contamination (e.g. lipoproteins and endotoxins) has been confirmed using HEK-Blue™ TLR2 and HEK-Blue™ TLR4 cells.


• 100 µg purified anti-hCTLA4-hIgG2 antibody, provided azide-free and lyophilized


  1. Grosso JF. & Jure-Kunkel MN., 2013. CTLA-4 blockade in tumor models: an overview of preclinical and translational research. Cancer Immun. 13:5. 
  2. Maio M. et al., 2013. Update on the role of ipilimumab in melanoma and first data on new combination therapies. Curr Opin Oncol. 25:166-72.
  3. Laurent S.. et al., 2013. The engagement of CTLA-4 on primary melanoma cell lines induces antibody-dependent cellular cytotoxicity and TNF-α production. J Transl Med. 11:108.
  4. Tomasini P., 2012. Ipilimumab: its potential in non-small cell lung cancer. Ther Adv Med Oncol. 4: 43–50.



Description Human CTLA4 (ipilimumab) antibody - Human IgG2
Cat. Codehctla4-mab2
Unit Size100 µg
Price For price or distributor address,
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