PD-L1 Antibody (2341A) [Unconjugated]

Western blot shows lysates of RAW 264.7 mouse monocyte/macrophage cell line untreated (-) or treated (+) with 10 ug/mL LPS for 4 hours. PVDF membrane was probed with 2 µg/mL of Rabbit Anti-Mouse PD-L1/B7-H1 Monoclonal Antibody (Catalog # MAB90783) followed by HRP-conjugated Anti-Rabbit IgG Secondary Antibody (Catalog # HAF008). A specific band was detected for PD-L1/B7-H1 at approximately 55 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.

RAW 264.7 mouse monocyte/macrophage cell line either treated with LPS overnight (filled histogram) or untreated (open histogram) was stained with Rabbit Anti-Mouse PD-L1/B7-H1 Monoclonal Antibody (Catalog # MAB90783), followed by Allophycocyanin-conjugated Anti-Rabbit IgG Secondary Antibody (Catalog # F0111). View our protocol for Staining Membrane-associated Proteins. View our protocol for Staining Membrane-associated Proteins.

HEK293 human embryonic kidney cell line transfected with either (A) mouse PD-L1/B7-H1 or (B) irrelevant transfectants and eGFP was stained with Rabbit Anti-Mouse PD-L1/B7-H1 Monoclonal Antibody (Catalog # MAB90783) followed by Allophycocyanin-conjugated Anti-Rabbit IgG Secondary Antibody (Catalog # F0111). Quadrant markers were set based on control antibody staining (Catalog # MAB1050). View our protocol for Staining Membrane-associated Proteins.

• Reactivity: Mu
• Applications: WB, Flow, B/N, CyTOF-ready
• Clone: 2341A
• Clonality: Monoclonal
• Host: Rabbit
• Conjugate: Unconjugated

PD-L1 Antibody (2341A) [Unconjugated] Summary

• Additional Information: Recombinant Monoclonal Antibody.
• Immunogen: Mouse myeloma cell line NS0-derived recombinant mouse PD-L1/B7-H1
  Phe19-His239
  Accession # Q9EP73
• Specificity: Detects mouse PD-L1/B7-H1 in direct ELISAs.
• Source: N/A
• Isotype: IgG
• Clonality: Monoclonal
• Host: Rabbit
• Purity Statement: Protein A or G purified from cell culture supernatant

Applications/Dilutions

• Dilutions:
  • Blockade of Receptor-ligand Interaction
  • CyTOF-ready
  • Flow Cytometry 0.25 ug/10^6 cells
  • Western Blot 2 ug/mL

Packaging, Storage & Formulations

• Storage: Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
  • 12 months from date of receipt, -20 to -70 °C as supplied.
  • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
  • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
• Buffer: Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.
• Reconstitution Instructions: Reconstitute at 0.5 mg/mL in sterile PBS.

Notes

This product is produced by and ships from R&D Systems, Inc., a Bio-Techne brand.

Alternate Names for PD-L1 Antibody (2341A) [Unconjugated]

• Avelumab
• B7-H
• B7H1
• B7-H1
• B7H1PDCD1L1
• CD274 antigenMGC142294
• CD274 molecule
• CD274
• PDCD1L1
• PDCD1LG1
• PDCD1LG1MGC142296
• PDL1
• PD-L1
• PD-L1B7 homolog 1
• PDL1PDCD1 ligand 1
• programmed cell death 1 ligand 1
• Programmed death ligand 1

Background

Mouse B7 homolog 1(B7-H1), also called programmed death ligand 1 (PD-L1) and programmed cell death 1 ligand 1 (PDCD1L1), is a member of the B7 family of proteins that provide signals for regulating T-cell activation and tolerance (1‑4). Other family members include B7-1, B7-2, B7-H2, B7-H3 and PD-L2. B7 proteins are immunoglobulin (Ig) superfamily members with extracellular Ig-V-like and Ig-C-like domains and a short cytoplasmic region. Among the family members, they share from 20‑40% amino acid (aa) sequence identity. The cloned mouse B7-H1/PD-L1 cDNA encodes a 290 aa type I membrane precursor protein with a putative 18 aa signal peptide, a 220 aa extracellular region containing one V-like and one C-like Ig domain, a 22 aa transmembrane region, and a 30 aa cytoplasmic domain. Mouse and human B7-H1/PD-L1 share approximately 70% aa sequence identity. B7-H1/PD-L1 is one of two ligands for programmed death-1 (PD-1), a member of the CD28 family of immunoreceptors. The other identified ligand is PD-L2. Mouse B7-H1/PD-L1 and PD-L2 share approximately 34% aa sequence identity and have similar functions. B7-H1/PD-L1 is constitutively expressed in various lymphoid and non-lymphoid organs including placenta, heart, pancreas, lung, liver, and endothelium
(1‑4). The expression of B7-H1/PD-L1 is detected on B cells, T cells, monocytes, dendritic cells and thymic epithelial cells. IFN-gamma treatment induces B7-H1/PD-L1 expression in monocytes, dendritic cells, and endothelial cells. B7-H1/PD-L1 expression is also upregulated in a variety of tumor cell lines. On previously activated T cells, B7-H1/PD-L1 interaction with PD-1 inhibits TCR-mediated proliferation and cytokine production, suggesting an inhibitory role in regulating immune responses. In contrast, a costimulatory function for the PD-1 ligands on resting T cells has also been reported (1‑4).

1. Tamura, H. et al. (2001) Blood 97:1809.
2. Freeman, G. et al. (2000) J. Exp. Med. 192:1027.
3. Sharpe, A.H. and G. J. Freeman (2002) Nat. Rev. Immunol. 2:116.
4. Coyle, A. and J. Gutierrez-Ramos (2001) Nat. Immunol. 2:203.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

Publications for PD-L1 Antibody (MAB90783)(2)

Publications using MAB90783

• Blanco, T;Nakagawa, H;Musayeva, A;Krauthammer, M;Singh, RB;Narimatsu, A;Ge, H;Shoushtari, SI;Dana, R; Acquired Immunostimulatory Phenotype of Migratory CD103+ Dendritic Cells Promotes Alloimmunity Following Corneal Transplantation JCI insight 2024-09-05 [PMID: 39235864] (Bioassay, Mouse)
• SC Garrett-Th, A Massimi, EV Fedorov, JB Bonanno, L Scandiuzzi, B Hillerich, RD Seidel, JD Love, SJ Garforth, C Guha, SC Almo Mechanistic dissection of the PD-L1:B7-1 co-inhibitory immune complex PLoS ONE, 2020-06-04;15(6):e0233578. 2020-06-04 [PMID: 32497097] (ICC, Mouse)

Bioinformatics

• Uniprot:
  • Q9EP73()