Anti-Human PD-1 (Cemiplimab)

Anti-Human PD-1 (Cemiplimab)

Product No.: LT2200

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Product No.LT2200
Product Type
Biosimilar Recombinant Human Monoclonal Antibody
Alternate Names
CD279, PD1, REGN-2810, Anti-PD1, PDCD1
Human IgG4κ

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Antibody Details

Product Details

Reactive Species
Expression Host
HEK-293 Cells
FC Effector Activity
Human PD-1
Product Concentration
≥ 5.0 mg/ml
Endotoxin Level
≤ 1.0 EU/mg as determined by the LAL method
≥95% by SDS Page
≥95% monomer by analytical SEC
This biosimilar antibody is aseptically packaged and formulated in 0.01 M phosphate buffered saline (150 mM NaCl) PBS pH 7.2 - 7.4 with no carrier protein, potassium, calcium or preservatives added. Due to inherent biochemical properties of antibodies, certain products may be prone to precipitation over time. Precipitation may be removed by aseptic centrifugation and/or filtration.
State of Matter
Product Preparation
Recombinant biosimilar antibodies are manufactured in an animal free facility using only in vitro protein free cell culture techniques and are purified by a multi-step process including the use of protein A or G to assure extremely low levels of endotoxins, leachable protein A or aggregates.
Pathogen Testing
To protect mouse colonies from infection by pathogens and to assure that experimental preclinical data is not affected by such pathogens, all of Leinco’s recombinant biosimilar antibodies are tested and guaranteed to be negative for all pathogens in the IDEXX IMPACT I Mouse Profile.
Storage and Handling
Functional grade biosimilar antibodies may be stored sterile as received at 2-8°C for up to one month. For longer term storage, aseptically aliquot in working volumes without diluting and store at -80°C. Avoid Repeated Freeze Thaw Cycles.
Regulatory Status
Research Use Only (RUO). Non-Therapeutic.
Country of Origin
2-8° C Wet Ice
Additional Applications Reported In Literature ?
Each investigator should determine their own optimal working dilution for specific applications. See directions on lot specific datasheets, as information may periodically change.


This non-therapeutic biosimilar antibody uses the same variable region sequence as the therapeutic antibody Cemiplimab. This product is for research use only. Cemiplimaba activity is directed against Human PD-1.
Antigen Distribution
PD-1 is expressed on activated T cells, B cells, a subset of thymocytes, macrophages, dendritic cells, and some tumor cells and is also retained in the intracellular compartments of regulatory T cells (Tregs).
PD-1 is a transmembrane protein in the CD28/CTLA-4 subfamily of the Ig superfamily1, 2. When stimulated via the T cell receptor (TCR), Tregs translocate PD-1 to the cell surface3. Programmed cell death 1 ligand 1 (PD-L1; CD274; B7H1) and programmed cell death 1 ligand 2 (PD-L2; CD273; B7DC) have been identified as PD-1 ligands1. PD-1 is co-expressed with PD-L1 on tumor cells and tumor-infiltrating antigen-presenting cells (APCs)2. Additionally, PD-1 is co-expressed with IL2RA on activated CD4+ T cells3.

PD-1 is an immune checkpoint receptor that suppresses cancer-specific immune responses4. Additionally, PD-1 acts as a T cell inhibitory receptor and plays a critical role in peripheral tolerance induction and autoimmune disease prevention as well as important roles in the survival of dendritic cells, macrophage phagocytosis, and tumor cell glycolysis2. PD-1 prevents uncontrolled T cell activity, leading to attenuation of T cell proliferation, cytokine production, and cytolytic activities. Additionally, the PD-1 pathway is a major mechanism of tumor immune evasion, and, as such, PD-1 is a target of cancer immunotherapy2.

Cemiplimab is a fully human, hinge-stabilized (S228P) high affinity anti-PD-1 antibody that potently blocks PD-1 interaction with PD-L1 and PD-L2 ligands and enhances human primary T-cell responses in vitro5. Cemiplimab was generated using VelocImmune knock-in mice immunized with recombinant human PD-1-mFc protein containing the PD-1 extracellular domain (amino acids 1-167) and the Fc portion of mouse IgG2a. Splenocyte-derived hybridomas were screened for human monoclonal antibody reactivity to recombinant human PD-1-hFc (extracellular domain of human PD-1 fused to human IgG1 Fc).

Cemiplimab is the first approved treatment in the United States and EU for patients with locally advanced or metastatic cutaneous squamous cell carcinoma who are not candidates for curative surgery or radiotherapy6.

Antigen Details

PD-1, CD279
NCBI Gene Bank ID
Research Area

References & Citations

1. Matsumoto K, Inoue H, Nakano T, et al. J Immunol. 172(4):2530-2541. 2004.
2. Zhao Y, Harrison DL, Song Y, et al. Cell Rep. 24(2):379-390.e6. 2018.
3. Raimondi G, Shufesky WJ, Tokita D, et al. J Immunol. 176(5):2808-2816. 2006.
4. Pardoll DM. Nat Rev Cancer. 12(4):252-264. 2012.
5. Burova E, Hermann A, Waite J, et al. Mol Cancer Ther. 16(5):861-870. 2017.
6. Lee A, Duggan S, Deeks ED. Drugs. 80(8):813-819. 2020.
Indirect Elisa Protocol
Flow Cytometry
Immunoprecipitation Protocol
General Western Blot Protocol

Formats Available

Products are for research use only. Not for use in diagnostic or therapeutic procedures.