Anti-Human CTLA-4 (Ipilimumab)

Antibody Details

Product Details

Reactivity Species

Human

Host Species

Human

Expression Host

HEK-293

FC Effector Activity

Active

Immunogen

Human CTLA-4

Product Concentration

≥ 5.0 mg/ml

Endotoxin Level

≤ 1.0 EU/mg as determined by the LAL method

Purity

≥95% monomer by analytical SEC

Formulation

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.

Product Preparation

Functional grade preclinical 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

USA

Shipping

Next Day 2-8°C

RRID

AB_2893919

Applications and Recommended Usage?
Quality Tested by Leinco

FC The suggested concentration for Ipilimumab biosimilar antibody for staining cells in flow cytometry is ≤ 0.25 μg per 10⁶ cells in a volume of 100 μl. Titration of the reagent is recommended for optimal performance for each application.

Other Applications Reported In Literature ?

B
ELISA
CyTOF®

Each investigator should determine their own optimal working dilution for specific applications. See directions on lot specific datasheets, as information may periodically change.

Description

Specificity

This non-therapeutic biosimilar antibody uses the same variable region sequence as the therapeutic antibody Ipilimumab. Ipilimumab binds to Human CTLA-4. This product is for research use only.

Antigen Distribution

CTLA4 is constitutively expressed in regulatory T cells.

Background

Cytotoxic T-lymphocyte–associated antigen 4 (CTLA-4) is a protein receptor that serves as an immune checkpoint and down-regulates the immune system. CTLA-4 is constitutively expressed in regulatory T cells but is only upregulated in conventional T cells following activation. Many cancers, including Melanoma, are associated with CTLA-4 upregulation because the body’s ability to recognize and destroy cancer cells is hampered by an inhibitory mechanism. Ipilimumab targets CTLA-4 and works by turning off this inhibitory mechanism and, thus, enhances the body’s own immune response against cancer cells.”² Emerging research suggests that combined blockade of PD-1 and CTLA-4, with Nivolumab and Ipilimumab respectively, could produce greater antitumor activity than blockade of either pathway alone.¹ This cost-effective, research-grade Anti-Human CTLA-4 (Ipilimumab) utilizes the same variable regions from the therapeutic antibody Ipilimumab making it ideal for research projects.

Antigen Details

Protein

CTLA-4

PubMed

CTLA-4

NCBI Gene Bank ID

1493

UniProt.org

Information on Uniprot.org

Research Area

Immunology

References & Citations

1. Wolchok, JD. et al. (2013) N Engl J Med 369(2):122-33.

2. Soo, RA. et al. (2017) Lancet Oncol. 18(12):e731-e741.

3. Lipson, EJ. and Drake, CG. (2011) Clin Cancer Res 17(22):6958-62.

Technical Protocols