CD155:TIGIT [Biotinylated] Inhibitor Screening Chemiluminescence Assay Kit

Catalog #
82526
$750 *
Size: 96 reactions
Qty
*US Pricing only. For international pricing, please contact your local distributor.
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Description

The CD155:TIGIT [Biotinylated] Inhibitor Screening Chemiluminescence Assay Kit is an ELISA-based assay designed for screening and profiling molecules that block the binding between CD155 (cluster of differentiation 55) and TIGIT (T-cell immunoreceptor with Ig and ITIM domains). This kit comes in a convenient 96-well format, with enough recombinant human biotin-labeled TIGIT (amino acids 22-141), CD155 (amino acids 27-343), streptavidin-labeled HRP, and assay buffer for 100 reactions.

Figure 1: Illustration of the mechanism of CD155: TIGIT [Biotinylated] Inhibitor Screening Chemiluminescence Assay Kit.
A 96-well plate is coated with the human recombinant CD155 protein. After blocking, the plate is pre-incubated with an inhibitor or neutralizing antibody. After incubation with Biotin-TIGIT, the plate is washed and Streptavidin-HRP is added. The ELISA ECL substrate is added, and the resulting signal is measured using a chemiluminescence microplate reader. The chemiluminescence signal is proportional to the binding of CD155 to TIGIT.

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Synonyms
Poliovirus receptor, Nectin-like protein 5, T-cell immunoreceptor with Ig and ITIM domains, V-set and immunoglobulin domain-containing protein 9 (VSIG9), and V-set and transmembrane domaincontaining protein 3 (VSTM3), WUCAM
Product Info
Storage and Usage
Citations
Assay Kit Format
Chemiluminescent
Species
Human
Materials Required But Not Supplied
  • 1x PBS Buffer (Phosphate Buffer Saline, pH 7.4)
  • PBS-T Buffer (1x PBS buffer with 0.05% Tween-20)
  • Microplate reader capable of reading chemiluminescence
  • Adjustable micropipettor and sterile tips
  • Rotating or rocker platform
Format
Catalog # Name Amount Storage
71251 TIGIT, Fc Fusion, Avi-Tag, Biotin-Labeled* 5 µg -80°C
79063 CD155, Fc-Avi-Tag* 25 µg -80°C
  5x PP-02 Buffer 4 ml -20°C
  Blocking Buffer 7 40 ml +4°C
79742 Streptavidin-HRP 10 µl +4°C
79670 ELISA ECL Substrates A (translucent bottle) 6 ml Room Temp
ELISA ECL Substrates B (brown bottle) 6 ml Room Temp
79699 White 96-well microplate 1 Room Temp

* The concentration of protein is lot-specific and will be indicated on the tube containing the protein.

UniProt #
TIGIT: Q495A1; CD155: P15151
Background

TIGIT (T-cell immunoreceptor with Ig and ITIM domains) is an immune checkpoint, co-inhibitory receptor of the family of PVR (poliovirus receptor)-like proteins that is highly expressed on the surface of Natural Killer (NK) cells, activated CD4+, CD8+, and regulatory T cells. TIGIT has three ligands: CD155, CD112 and CD113. TIGIT has the highest affinity for CD155, which is present on antigen presenting cells (APCs) such as dendritic cells, on T cells, B cells, and macrophages. TIGIT binding to CD155 recruits the Src homology (SH) domain-containing protein tyrosine phosphatases SHP1 and SHP2 or the inositol phosphatases SHIP1 and SHIP2 to the TIGIT ITIM domain (immunoreceptor tyrosine-based inhibitory motif). This increases the production of IL-10 and decreases IL-12 release, and it suppresses NF-kB (nuclear factor kappa-light chain enhancer of activated B cells) and NFAT (nuclear factor of activated T cells) T cell receptor (TCR) signaling, which blocks T cell proliferation and cytokine production. TIGIT may also play a role in immune regulation via cell-intrinsic mechanisms, with anti-TIGIT agonist antibodies blocking the anti-CD3/anti-CD28 activation of T cells and DNAM-1 (DNAX accessory molecule-1) signaling in the absence of APCs. TIGIT is found at high levels in TILs (tumor-infiltrating lymphocytes) in AML (acute myeloid leukemia), MM (multiple myeloma), NSCLC (non-small cell lung carcinoma) and other cancers. On the other hand, cancer cells can also express CD155. The development of TIGIT-blocking strategies is an active area of research, with several ongoing clinical trials using anti-TIGIT blocking antibodies.

References

Yu X., et al., 2009. Nat. Immunol. 10(1): 48-57.
Stanietsky N., et al., 2009. Proc. Natl. Acad. Sci. 106(42): 17858-17863.
Harjunpaa H. and Guillerey C., 2020 Clin Exp Immunol 200(20:108-119.