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Anti-PD-L1 antibody [28-8] is a rabbit recombinant monoclonal antibody that is used to detect PD-L1 in Flow cytometry, ICC/IF, IHC-Fr, IHC-P, Western blot, mIHC. Suitable for Human samples.

- Cited in over 275 publications
- Recombinant format for consistent batch-to-batch performance
- Specificity confirmed with CD274 knockout cell line validation
- Antibody clone 28-8 is cited in over 570 publications


Images

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (AB205921), expandable thumbnail
  • Immunocytochemistry/ Immunofluorescence - Anti-PD-L1 antibody [28-8] (AB205921), expandable thumbnail
  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (AB205921), expandable thumbnail
  • Flow Cytometry - Anti-PD-L1 antibody [28-8] (AB205921), expandable thumbnail
  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (AB205921), expandable thumbnail

Publications

Key facts

Isotype
IgG
Host species
Rabbit
Storage buffer

pH: 7.2 - 7.4
Preservative: 0.01% Sodium azide
Constituents: 59% PBS, 40% Glycerol (glycerin, glycerine), 0.05% BSA

Form
Liquid
Clonality
Monoclonal

Immunogen

  • The exact immunogen used to generate this antibody is proprietary information.

Reactivity data

Select an application
Product promiseTestedExpectedPredictedNot recommended
mIHCIHC-PICC/IFFlow CytWBIHC-Fr
Human
Tested
Tested
Tested
Tested
Tested
Tested
Mouse
Not recommended
Not recommended
Not recommended
Not recommended
Not recommended
Not recommended
Transfected cell line
Not recommended
Tested
Tested
Not recommended
Not recommended
Not recommended

Tested
Tested

Species
Human
Dilution info
-
Notes

-

Not recommended
Not recommended

Species
Transfected cell line, Mouse
Dilution info
-
Notes

-

Tested
Tested

Species
Human
Dilution info
2 µg/mL
Notes

Please refer to protocol booklet.

For antigen buffer for FFPE tissue, it is recommended to use Universal HIER antigen retrieval reagent (Universal HIER antigen retrieval reagent (10X) ab208572).

Perform heat-mediated antigen retrieval before commencing with IHC staining protocol.

Species
Transfected cell line
Dilution info
2 µg/mL
Notes

Please refer to protocol booklet.

For antigen buffer for FFPE tissue, it is recommended to use Universal HIER antigen retrieval reagent (Universal HIER antigen retrieval reagent (10X) ab208572).

Perform heat-mediated antigen retrieval before commencing with IHC staining protocol.

Not recommended
Not recommended

Species
Mouse
Dilution info
-
Notes

Please refer to protocol booklet.

For antigen buffer for FFPE tissue, it is recommended to use Universal HIER antigen retrieval reagent (Universal HIER antigen retrieval reagent (10X) ab208572).

Perform heat-mediated antigen retrieval before commencing with IHC staining protocol.

Tested
Tested

Species
Transfected cell line
Dilution info
2 µg/mL
Notes

-

Species
Human
Dilution info
2 µg/mL
Notes

-

Not recommended
Not recommended

Species
Mouse
Dilution info
-
Notes

-

Tested
Tested

Species
Human
Dilution info
-
Notes

Please refer to protocol in Support&downloads section

Rabbit IgG, monoclonal [EPR25A] - Isotype Control ab172730 - Rabbit monoclonal IgG, is suitable for use as an isotype control with this antibody.

Not recommended
Not recommended

Species
Transfected cell line, Mouse
Dilution info
-
Notes

-

Tested
Tested

Species
Human
Dilution info
-
Notes

Please refer to protocol in Support&downloads section

Anti-PD-L1 antibody [73-10] ab228415 works better than ab205921 in western blot testing.

Not recommended
Not recommended

Species
Transfected cell line, Mouse
Dilution info
-
Notes

-

Tested
Tested

Species
Human
Dilution info
2 µg/mL
Notes

-

Not recommended
Not recommended

Species
Transfected cell line, Mouse
Dilution info
-
Notes

-

Associated Products

Select an associated product type

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1 product for Alternative Version

Target data

Function

Plays a critical role in induction and maintenance of immune tolerance to self (PubMed:11015443, PubMed:28813410, PubMed:28813417, PubMed:31399419). As a ligand for the inhibitory receptor PDCD1/PD-1, modulates the activation threshold of T-cells and limits T-cell effector response (PubMed:11015443, PubMed:28813410, PubMed:28813417, PubMed:36727298). Through a yet unknown activating receptor, may costimulate T-cell subsets that predominantly produce interleukin-10 (IL10) (PubMed:10581077). Can also act as a transcription coactivator: in response to hypoxia, translocates into the nucleus via its interaction with phosphorylated STAT3 and promotes transcription of GSDMC, leading to pyroptosis (PubMed:32929201). The PDCD1-mediated inhibitory pathway is exploited by tumors to attenuate anti-tumor immunity and escape destruction by the immune system, thereby facilitating tumor survival (PubMed:28813410, PubMed:28813417). The interaction with PDCD1/PD-1 inhibits cytotoxic T lymphocytes (CTLs) effector function (By similarity). The blockage of the PDCD1-mediated pathway results in the reversal of the exhausted T-cell phenotype and the normalization of the anti-tumor response, providing a rationale for cancer immunotherapy (By similarity).

Alternative names

Recommended products

Anti-PD-L1 antibody [28-8] is a rabbit recombinant monoclonal antibody that is used to detect PD-L1 in Flow cytometry, ICC/IF, IHC-Fr, IHC-P, Western blot, mIHC. Suitable for Human samples.

- Cited in over 275 publications
- Recombinant format for consistent batch-to-batch performance
- Specificity confirmed with CD274 knockout cell line validation
- Antibody clone 28-8 is cited in over 570 publications

Key facts

Isotype
IgG
Form
Liquid
Clonality
Monoclonal
Immunogen
  • The exact immunogen used to generate this antibody is proprietary information.
Clone number
28-8
Purification technique
Affinity purification Protein A
Concentration
Loading...

Storage

Shipped at conditions
Blue Ice
Appropriate short-term storage duration
1-2 weeks
Appropriate short-term storage conditions
+4°C
Appropriate long-term storage conditions
-20°C
Aliquoting information
Upon delivery aliquot
Storage information
Avoid freeze / thaw cycle

Notes

Anti-PD-L1 antibody [28-8] (ab205921) was developed by Abcam using patented rabbit monoclonal antibody technology and is validated for use in Flow Cyt, ICC/IF, IHC-Fr, IHC-P, WB, mIHC in human samples.

Anti-PD-L1 antibody [28-8] (ab205921) has been cited over 476 times in peer reviewed journals and is trusted by the scientific community.

Abcam's high quality manufacturing and validation processes ensure Anti-PD-L1 antibody [28-8] (ab205921) has high sensitivity and specificity alongside high lot-to-lot consistency and reproducibility.

The specificity of Anti-PD-L1 antibody [28-8] (ab205921) has been confirmed by testing in knockout samples.

Anti-PD-L1 antibody [28-8] (ab205921) has 13 independent reviews from customers.

Anti-PD-L1 antibody [28-8] (ab205921) specifically detects PD-L1 (UniProt ID: Q9NZQ7; Molecular weight: 31kDa) and is sold in a convenient trial size to enable initial testing (20 µL) and larger sizes for subsequent scaling up experiments (50 µL).

Conjugation-ready, carrier free format available for antibody clone 28-8 - Anti-PD-L1 antibody [28-8] - BSA and Azide free ab228413.

Antibody clone 28-8 is also available pre-conjugated to a variety of labels for your convenience - HRP, PE, Alexa Fluor® 555, Alexa Fluor® 568, Alexa Fluor® 594, FITC (HRP Anti-PD-L1 antibody [28-8] ab209961, PE Anti-PD-L1 antibody [28-8] ab209962, Alexa Fluor® 555 Anti-PD-L1 antibody [28-8] ab213358, Alexa Fluor® 568 Anti-PD-L1 antibody [28-8] ab213359, Alexa Fluor® 594 Anti-PD-L1 antibody [28-8] ab213360, FITC Anti-PD-L1 antibody [28-8] ab224027).

PD-L1 (Programmed Death-Ligand 1) is a protein that plays a significant role in oncology, particularly in the immune response to cancer. It is expressed on the surface of cancer cells and interacts with the PD-1 receptor on T-cells, effectively inhibiting the immune system's ability to attack the tumor. This interaction is a key target for immunotherapy drugs, such as checkpoint inhibitors, which block the PD-1/PD-L1 pathway, allowing the immune system to recognize and destroy cancer cells.

FURTHER INFORMATION ON POSITIVE CONTROLS (Chinese version)

Tissue:
- Tonsil - with hyperreactive changes. Screening of hyper-reactive tonsils is recommended to find tonsil with the highest expression of PD-L1 in crypt epithelium, macrophages homing the germinal centers and interfollicular mononuclear leukocytes.
- Tumor tissues - prescreened for positive tumor and inflammatory infiltrates. PD-L1 expression varies by tumor type so screening is recommended to find positive and negative tumor controls.
- The following publication is useful for finding suitable tumor types for PD-L1 expression:
http://www.immunotherapyofcancer.org/content/1/S1/P53
- Note: Look for specimens with high numbers of inflammatory macrophages and mononuclear leukocytes.

Cell Lines:
- Positive controls: B-CPAP (high), ES-2 (medium), HCC70 (low).

Primary antibody negative control: Recombinant Rabbit IgG isotype control antibody, Rabbit IgG, monoclonal [EPR25A] - Isotype Control ab172730.

Recombinant protein positive control: Recombinant human PD-L1 protein, Recombinant human PD-L1 protein (Active) ab167713.

Immunohistochemistry usage:
For IHC usage on FFPE tissues, we recommend using PD-L1 IHC panel PD-L1 antibody (28-8) IHC antigen retrieval and detection panel ab236676, which contains PD-L1 antibody clone 28-8 (ab205921), HIER antigen retrieval reagent (Universal HIER antigen retrieval reagent (10X) ab208572) and IHC detection kit HRP/DAB (Rabbit specific IHC polymer detection kit HRP/DAB ab209101).

Western blot usage:
For clone 28-8, it is recommended to use Odyssey system. This system has the advantages of a wider dynamic range and less background than chemiluminescence.

This PD-L1 antibody [28-8] has been used as detector antibody in Human PD-L1 SimpleStep ELISA® kit: ab214565 and Human PD-L1 ELISA Kit [28-8] ab277712.

To support you in your biomarker discovery and validation studies, we offer a comprehensive suite of solutions including high quality, validated recombinant antibodies and assay kits.

Our RabMAb® technology is a patented hybridoma-based technology for making rabbit monoclonal antibodies. For details on our patents, please refer to RabMAb® patents.

This product is a recombinant monoclonal antibody, which offers several advantages including:

  • - High batch-to-batch consistency and reproducibility
  • - Improved sensitivity and specificity
  • - Long-term security of supply
  • - Animal-free batch production

For more information, read more on recombinant antibodies.

Supplementary info

This supplementary information is collated from multiple sources and compiled automatically.
Activity summary

PD-L1 also known as programmed death-ligand 1 or CD274 plays an important role in the immune system. It is a protein expressed on antigen-presenting cells and some tumor cells helping them interact with T-cells. The molecular weight of PD-L1 is approximately 33 kDa. PD-L1 expression can occur in various tissues and is often upregulated in tumor microenvironments. This increased expression helps tumors evade the immune response.

Biological function summary

PD-L1 modulates the immune response by interacting with its receptor PD-1 on T-cells and other immune cells leading to immune suppression. It is part of the PD-1/PD-L1 complex an important regulator of T-cell activity and immune tolerance. The binding of PD-L1 to PD-1 inhibits T-cell proliferation and cytokine production reducing the ability of the immune system to attack cancer cells.

Pathways

PD-L1 is involved in the immune checkpoint pathway and the cancer immunity cycle. Its interaction with PD-1 influences important signaling cascades within these pathways affecting the immune system's capacity to target tumor cells effectively. Another protein important in this context is CTLA-4 another immune checkpoint regulator which along with PD-1 modulates immune system activity against cancer.

Associated diseases and disorders

PD-L1 has strong connections to cancer and autoimmune diseases. Many cancers including melanoma and non-small cell lung cancer exploit PD-L1 to protect themselves from the immune system. Increased PD-L1 expression can also impact autoimmune disorders where the immune system reacts against healthy body tissues. This interaction further involves PD-1 and CTLA-4 illustrating their shared roles in these disease contexts.

Product promise

We are dedicated to supporting your work with high quality reagents and we are here for you every step of the way should you need us.

In the unlikely event of one of our products not working as expected, you are covered by our product promise.

Full details and terms and conditions can be found here:
Terms & Conditions.

25 product images

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) analysis of human non-small cell lung cancer tissue labelling PD-L1 with ab205921. Tumor cells and immuno cells localized within the stroma show PD-LA plasma membrane staining.

    For antigen retrival buffer, Universal HIER antigen retrieval reagent (Universal HIER antigen retrieval reagent (10X) ab208572) was used.
    For IHC detection kit, Rabbit specific IHC polymer detection kit HRP/DAB (Rabbit specific IHC polymer detection kit HRP/DAB ab209101) is recommended.

  • Immunocytochemistry/ Immunofluorescence - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail
    This image is courtesy of a customer review submitted by Dr. Dimitra Kalamida.

    Immunocytochemistry/ Immunofluorescence - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunofluorescence staining of U-87 MG cells using rabbit anti-PD-L1 antibody

    Paraformaldehyde-fixed Triton X-100 permeabilized U-87 MG (human glioblastoma-astrocytoma epithelial cell line) cells stained for PD-L1 (red) using ab205921 at 1/200 dilution in ICC/IF followed by CF568 Donkey anti-rabbit IgG(H+L) secondary antibody at 1/500 dilution.

    Alexa Fluor® 488 (Alexa Fluor® 488 Anti-PD-L1 antibody [28-8] ab209959) and Alexa Fluor® 647 (Alexa Fluor® 647 Anti-PD-L1 antibody [28-8] - Extracellular domain ab209960) conjugated versions are available for this clone.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail
    Nakamura et al PLoS One. 2017; 12(10): e0186192. Published online 2017 Oct 19. doi: 10.1371/journal.pone.0186192

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of human lung using rabbit anti-PD-L1 antibody

    Formalin-fixed paraffin-embedded human lung cancer tissue stained for PD-L1 using ab205921.

    Representative images of PD-L1 expression.
    (A) <1.0% (B) 1.0–4.9% (C) 5.0–9.9% (D) 10.0–49.9% and (E) ≥50.0% PD-L1-positive cells (magnification 200×).

    From image 3 of Nakamura et al.

    Nakamura et al PLoS One. 2017; 12(10): e0186192. Published online 2017 Oct 19. doi: 10.1371/journal.pone.0186192' PMID: 29049375

    |Reproduced under Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original author and source are credited.

  • Flow Cytometry - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Flow Cytometry - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 flow cytometry staining of PDL-1 KO cells using rabbit anti-PD-L1 antibody

    ab205921 specificity testing by Flow Cytometry (KO testing): Loss of detection on KO cells.Strong detection with anti-PD-L1 (ab205921 clone 28-8) TALEN constructs targeting exon4 of human PD-L1 transcript variant 1 (NM_014143.3) and complete knock out (K.O) confirmed by deep sequencing in clone L2-14. Cell surface staining is almost completely eliminated in the L2987 L2-14 KO cell line. For recommended Flow Cytometry (Flow Cyt) protocol please refer to the protocol book in the protocol section. Alexa Fluor® 488 (Alexa Fluor® 488 Anti-PD-L1 antibody [28-8] ab209959) and Alexa Fluor® 647 (Alexa Fluor® 647 Anti-PD-L1 antibody [28-8] - Extracellular domain ab209960) conjugated versions are available for this clone.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of human tonsil using rabbit anti-PD-L1 antibody

    IHC image of ab205921 staining PD-L1 in human tonsil formalin fixed paraffin embedded tissue sections* performed on a Leica BOND RX (Polymer Refine kit). The section was pre-treated using heat mediated antigen retrieval with EDTA buffer (pH9 epitope retrieval solution 2) for 30 mins at 98°C. The section was then incubated with ab205921 5μg/ml working concentration for 60 mins at room temperature and detected using an HRP conjugated compact polymer system for 8 minutes at room temperature. DAB was used as the chromogen for 10 minutes at room temperature. The section was then counterstained with hematoxylin blued dehydrated cleared and mounted with DPX.

    For other IHC staining systems (automated and non-automated) customers should optimize variable parameters such as antigen retrieval conditions primary antibody concentration and antibody incubation times.

    *Tissue obtained from the Human Research Tissue Bank supported by the NIHR Cambridge Biomedical Research Centre

  • Immunohistochemistry (Frozen sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Frozen sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of human tonsil using rabbit anti-PD-L1 antibody

    IHC image of PD-L1 staining in a section of frozen normal human tonsil* performed on a Leica BOND™ system using the standard protocol. The section was fixed in 10% paraformaldehyde (10 min) prior to staining. The section was incubated with ab205921 1ugml for 15 mins at room temperature and detected using an HRP conjugated compact polymer system. DAB was used as the chromogen. The section was then counterstained with haematoxylin and mounted with DPX. The inset secondary-only control image is taken from an identical assay without primary antibody.


    For other IHC staining systems (automated and non-automated) customers should optimize variable parameters such as antigen retrieval conditions primary antibody concentration and antibody incubation times.


    *Tissue obtained from the Human Research Tissue Bank supported by the NIHR Cambridge Biomedical Research Centre

  • Immunocytochemistry/ Immunofluorescence - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunocytochemistry/ Immunofluorescence - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunofluorescence staining of CHO-PD-L1 cells using rabbit anti-PD-L1 antibody

    Immunocytochemistry analysis of CHO-PDL1 (PD-L1 stably expessed Chinese hamster ovary epithelial cell) labeling PD-L1 with purified ab205921 at 1/400 dilution. Cells were fixed with 4% Paraformaldehyde and permeabilised with 0.1% tritonX-100. Goat anti rabbit IgG (Alexa Fluor® 488 Goat Anti-Rabbit IgG H&L (Alexa Fluor® 488) ab150077) at 1/1000 (2 μg/ml) was used as the secondary antibody. Alexa Fluor® 594 Anti-alpha Tubulin antibody [DM1A] - Microtubule Marker ab195889 Anti-alpha Tubulin antibody [DM1A] - Microtubule Marker (Alexa Fluor® 594) 1/200 (2.32 μg/ml) was used as counterstain. Nuclei were stained blue with DAPI.
    Negative controls: Cells not transfected with PD-L1 and both the transfected and mock tranfected cells without the primary antibody.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    Immunohistochemical staining of PD-L1 in formalin fixed, paraffin embedded human non-squamous non-small cell lung cancer (NSQ-NSCLC) using ab205921 at a dilution of 1/400, incubated for an hour at room temperature. Heat mediated antigen retrieval was carried out in low pH buffer and the sample was blocked with peroxidase blocking buffer for 3 minutes.

    This image was courteously provided by Dr. Kai Schmitt from the Institute of Pathology, Saarbrücken-Rastpfuhl.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of human placenta using rabbit anti-PD-L1 antibody

    Paraformaldehyde-fixed paraffin-embedded human placenta tissue stained for PD-L1 using ab205921 at 1/100 dilution in immunohistochemical analysis.

  • Western blot - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Western blot - Anti-PD-L1 antibody [28-8] (ab205921)

    Blocking/Diluting buffer and concentration: 5% NFDM/TBST. Expression of PD-L1 varied widely among the tumor cell lines.

    All lanes: Western blot - Anti-PD-L1 antibody [28-8] (ab205921) at 1/100 dilution

    Lane 1: H1975 (Human non-small cell lung cancer epithelial cell) whole cell lysate at 20 µg

    Lane 2: NCI-H1299 (Human lung carcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 3: A549 (Human lung carcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 4: MDA-MB-231 (Human breast adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 5: MCF7 (Human breast adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 6: SK-BR-3 (Human breast adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 7: SW480 (Human colorectal adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 8: HCT 116 (Human colorectal carcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 9: PC-3 (Human prostate adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 10: DU 145 (Human prostate carcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 11: A375 (Human malignant melanoma epithelial cell) whole cell lysate at 20 µg

    Lane 12: MeWo (Human malignant melanoma fibroblast) whole cell lysate at 20 µg

    Lane 13: U-87 MG (Human glioblastoma-astrocytoma epithelial cell) whole cell lysate at 20 µg

    Lane 14: Huh7 (Human hepatocellular carcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 15: HepG2 (Human hepatocellular carcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 16: BXPC-3 (Human pancreas adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 17: PANC-1 (Human pancreatic epithelioid carcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 18: NIH:OVCAR-3 (Human ovary adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 19: SK-OV-3 (Human ovarian cancer epithelial cell) whole cell lysate at 20 µg

    Lane 20: HeLa (Human cervix adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Secondary

    All lanes: Western blot - Goat Anti-Rabbit IgG H&L (HRP) (Goat Anti-Rabbit IgG H&L (HRP) ab97051) at 1/20000 dilution

    Predicted band size: 33 kDa

    Observed band size: 40-60 kDa

    Exposure time: 3min

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    IHC image of ab205921 staining PD-L1 in PD-L1 Dynamic Range Analyte Control formalin fixed paraffin embedded cell lines (HistoCyte Laboratories), performed on a Leica BOND RX (Polymer Refine kit). The section was pre-treated using heat mediated antigen retrieval with EDTA buffer (pH9, epitope retrieval solution 2) for 30 mins at 98°C. The section was then incubated with ab205921, 5μg/ml working concentration, for 60 mins at room temperature and detected using an HRP conjugated compact polymer system for 8 minutes at room temperature. DAB was used as the chromogen for 10 minutes at room temperature. The section was then counterstained with hematoxylin, blued, dehydrated, cleared and mounted with DPX.

    For other IHC staining systems (automated and non-automated) customers should optimize variable parameters such as antigen retrieval conditions, primary antibody concentration and antibody incubation times.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    Anti-PD-L1 antibody [28-8] (ab205921)
    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) analysis of human tonsil tissue labelling PD-L1 with ab205921 at a dilution of 1:400. Heat mediated antigen retrieval was performed using AR9 antigen retrieval solution, and microwave treatment for 15 min at 20% power. Anti-Rabbit/Mouse HRP polymer (PerkinElmer Opal Polymer HRP Ms Plus Rb) was used as secondary antibody. Opal tyramide amplification was performed using Opal 520 fluorophore. Counterstained with DAPI stain. Image scanned with Vectra 3.0 and analyzed via Phenochart software.
    This image was courteously provided by Dr. Houssein Abdul Sater, Georgia Cancer Center.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    ab205921 specificity testing by Immunohistochemistry (KO testing): Loss of detection on KO Cells

    Strong IHC detection with anti-PD-L1 (ab205921, clone 28-8) is seen in human lung adenocarcinoma tumor cell line L2987. PDL1 gene was edited in L2987 cells using TALEN constructs targeting exon4 of human PD-L1, transcript variant 1 (NM_014143.3) and complete knock out (K.O) confirmed by deep sequencing in clone L2-14. IHC detection is completely eliminated in the L2987 L2-14 K.O. cell line.

    For recommended Immunohistochemistry (IHC) protocol, please refer to the protocol book in the protocol section and/or here (downloadable copy).

    Perform heat mediated antigen retrieval before commencing with IHC staining protocol.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    Immunohistochemical analysis of CHO PD-L1 cells with ab205921 at 2 μg/ml.
    High power view
    A) Rabbit IgG, 5 μg/mL. No staining
    B) Anti PD-L1, 2 μg/mL (ab205921 batches 1)
    C) Anti PD-L1, 2 μg/mL (ab205921 batches 3)
    D) Anti PD-L1, 2 μg/mL (ab205921 batches 4)
    E) Anti PD-L1, 2 μg/mL (ab205921 batches 5)
    F) Anti PD-L1, 2 μg/mL (ab205921 batches 6)
    G) Anti PD-L1, 2 μg/mL (ab205921 batches 7)

    All batches/lots (1,3,4,5,6,7) showed consistent results.


    Note strong, moderate, and weak (red, yellow, and white arrows respectively) plasma membrane staining of CHO PD-L1 transfected cells

    For recommended Immunohistochemistry (IHC) protocol, please refer to the protocol book in the Support&downloads section.

    Perform heat mediated antigen retrieval before commencing with IHC staining protocol.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of CHO cells using rabbit anti-PD-L1 antibody

    Immunohistochemical analysis of CHO Parental cells with ab205921 at 2 μg/ml.
    High power view
    A) Rabbit IgG 5 μg/mL. No staining
    B) Anti PD-L1 2 μg/mL (ab205921 batches 1)
    C) Anti PD-L1 2 μg/mL (ab205921 batches 3)
    D) Anti PD-L1 2 μg/mL (ab205921 batches 4)
    E) Anti PD-L1 2 μg/mL (ab205921 batches 5)
    F) Anti PD-L1 2 μg/mL (ab205921 batches 6)
    G) Anti PD-L1 2 μg/mL (ab205921 batches 7)

    All batches/lots (134567) showed consistent results.

    Note absence of PD-L1 expression in CHO parental cells.

    For recommended Immunohistochemistry (IHC) protocol please refer to the protocol book in the Support&downloads section.

    Perform heat mediated antigen retrieval before commencing with IHC staining protocol.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of lung NSCLC using rabbit anti-PD-L1 antibody

    Immunohistochemical analysis of Human Lung NSCLC with ab205921 at 2 μg/ml.
    High power view
    A) Rabbit IgG 5 μg/mL. No staining
    B) Anti PD-L1 2 μg/mL (ab205921 batches 1)
    C) Anti PD-L1 2 μg/mL (ab205921 batches 3)
    D) Anti PD-L1 2 μg/mL (ab205921 batches 4)
    E) Anti PD-L1 2 μg/mL (ab205921 batches 5)
    F) Anti PD-L1 2 μg/mL (ab205921 batches 6)

    All batches/lots (13456) showed consistent results.

    Note linear and complete or partial (arrows) PD-L1 staining of tumor cells. Tumor associated immune cells localized over the tumor margin exhibit positive plasma membrane staining (small arrows).

    For recommended Immunohistochemistry (IHC) protocol please refer to the protocol book in the Support&downloads section.

    Perform heat mediated antigen retrieval before commencing with IHC staining protocol.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of melanoma tissue using rabbit anti-PD-L1 antibody

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) analysis of human melanoma tissue labelling PD-L1 with ab205921. Tumor cells show weak and partial postive PD-L1 expresseion in the plasma membrane. PD-L1 positive tumor associated immunoe cells are also stained.

    For antigen retrival buffer Universal HIER antigen retrieval reagent (Universal HIER antigen retrieval reagent (10X) ab208572) was used.
    For IHC detection kit Rabbit specific IHC polymer detection kit HRP/DAB (Rabbit specific IHC polymer detection kit HRP/DAB ab209101) is recommended.

  • Western blot - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Western blot - Anti-PD-L1 antibody [28-8] (ab205921)

    (A and B) Western blots of recombinant PD-L1 protein (Lane 1), cell lysates of CHO-PD-L1 (Lane 3), CHO (Lane 4), ES-2 (Lane 5) and Colo205 (Lane 6) cell lines. In B, anti-PD-L1 (ab205921, clone 28-8) was pre-incubated with purified recombinant PDL1 protein overnight at 4°C.

    Blank/no sample (Lane2). Lane 2 is blank on purpose.

    For recommended Western Blot (WB) protocol, please refer to the protocol book in the Support&downlods section

    All lanes: Western blot - Anti-PD-L1 antibody [28-8] (ab205921)

    Predicted band size: 33 kDa

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    Immunohistochemical analysis of formalin-fixed, paraffin-embedded Human head and neck squamous cell carcinoma tissue labeling PD-L1 with ab205921 at 2 μg/ml. Counterstained with Hematoxylin.

    For antigen retrival buffer, Universal HIER antigen retrieval reagent (Universal HIER antigen retrieval reagent (10X) ab208572) was used.
    For IHC detection kit, Rabbit specific IHC polymer detection kit HRP/DAB (Rabbit specific IHC polymer detection kit HRP/DAB ab209101) is recommended.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of L2987 cells using rabbit anti-PD-L1 antibody

    Immunohistochemical analysis of formalin-fixed paraffin-embedded L2987 (Human lung adenocarcinoma cell line with endogenous PD-L1 expression) cells labeling PD-L1 with ab205921 at 2 μg/ml. Counterstained with Hematoxylin.

    For antigen retrival buffer Universal HIER antigen retrieval reagent (Universal HIER antigen retrieval reagent (10X) ab208572) was used.
    For IHC detection kit Rabbit specific IHC polymer detection kit HRP/DAB (Rabbit specific IHC polymer detection kit HRP/DAB ab209101) is recommended.

  • Multiplex immunohistochemistry - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Multiplex immunohistochemistry - Anti-PD-L1 antibody [28-8] (ab205921)

    Multiplex immunohistochemistry analysis of formalin/PFA-fixed paraffin-embedded Human tonsil tissue staining PD-L1 with ab205921 at a 1:500 (2.19 ug/ml) dilution; PD1 with Anti-PD1 antibody [CAL20] ab237728 at 1:2000 (0.525 ug/ml) dilution and CD68 with Anti-CD68 antibody [EPR20545] ab213363 at 1:500 (1.26 ug/ml) dilution followed by a ready to use secondary antibody Opal Polymer HRP Ms + Rb.

    Panel A: merged staining of anti-CD68 (magenta; Opal690), anti-PD-L1 (green; Opal520) and anti-PD1 (red; Opal570) on human tonsil.

    Panel B: anti-PD-L1 stained on cells involved in T cell inhibition.

    Panel C: anti-PD1 stained on antigen-stimulated T cells.

    Panel D: anti-CD68 stained on macrophages.

    The section was incubated in three rounds of staining: in the order of Anti-CD68 antibody [EPR20545] ab213363 and ab205921 for 30 mins, then Anti-PD1 antibody [CAL20] ab237728 for 10 mins at room temperature. Each round was followed by a separate fluorescent tyramide signal amplification system.

    The immunostaining was performed on a Leica Biosystems BOND® RX instrument with an Opal 4-color kit. Image acquisition was performed with Leica SP8 confocal microscope.

    Heat mediated antigen retrieval with Tris-EDTA buffer (pH 9.0, epitope retrieval solution2) for 20 mins

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of human tonsil using rabbit anti-PD-L1 antibody

    Immunohistochemical analysis of formalin-fixed paraffin-embedded human tonsil labelling PD-L1 with ab205921 at a dilution of 2µg/ml. The immunostaining was performed on a Ventana DISCOVERY ULTRA (Roche Tissue Diagnostics) instrument with an OptiView DAB IHC Detection Kit. Heat mediated antigen retrieval was conducted for 32min with ULTRA cell conditioning solution (CC1 pH8.5). ab205921 anti PD-L1 antibody was incubated at 37°C for 16min. Sections were counterstained is with Hematoxylin II. Image inset shows absence of staining in secondary antibody only control.

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    PD-L1 immunohistochemistry staining of human placenta using rabbit anti-PD-L1 antibody

    Immunohistochemical analysis of formalin-fixed paraffin-embedded human placenta labelling PD-L1 with ab205921 at a dilution of 2µg/ml. The immunostaining was performed on a Ventana DISCOVERY ULTRA (Roche Tissue Diagnostics) instrument with an OptiView DAB IHC Detection Kit. Heat mediated antigen retrieval was conducted for 32min with ULTRA cell conditioning solution (CC1 pH8.5). ab205921 anti PD-L1 antibody was incubated at 37°C for 16min. Sections were counterstained is with Hematoxylin II. Image inset shows absence of staining in secondary antibody only control.

  • Western blot - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Western blot - Anti-PD-L1 antibody [28-8] (ab205921)

    Anti-PD-L1 antibody [73-10] ab228415 works better than ab205921 in western blot testing.
    Blocking/Diluting buffer and concentration: 5% NFDM/TBST

    All lanes: Western blot - Anti-PD-L1 antibody [28-8] (ab205921) at 1/1000 dilution

    Lane 1: MDA-MB-231(human breast adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 2: U-87 MG (human glioblastoma astrocytoma epithelial cell) whole cell lysate at 20 µg

    Lane 3: PC-3 (human prostate adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 4: A375 (human malignant melanoma epithelial cell) whole cell lysate at 20 µg

    Lane 5: HeLa (human cervix adenocarcinoma epithelial cell) whole cell lysate at 20 µg

    Lane 6: A549 (human lung carcinoma epithelial cell) whole cell lysate at 20 µg

    Secondary

    All lanes: Western blot - Goat Anti-Rabbit IgG H&L (HRP) (Goat Anti-Rabbit IgG H&L (HRP) ab97051) at 1/20000 dilution

    Observed band size: 40-60 kDa

    Exposure time: 100s

  • Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921), expandable thumbnail

    Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-PD-L1 antibody [28-8] (ab205921)

    Tissue Microarrays stained for Anti-PD-L1 antibody [28-8] using ab205921 in immunohistochemical analysis. This table provides a detailed overview of positive (tick mark) and negative (cross mark) staining per sample type tested. The sections were pre-treated using Heat mediated antigen retrieval using Universal HIER antigen retrieval reagent (10X) ab208572 (Universal HIER antigen retrieval reagent). The sections were incubated with ab205921 at +4°C overnight. For IHC detection kit, Rabbit specific IHC polymer detection kit HRP/DAB (Rabbit specific IHC polymer detection kit HRP/DAB ab209101) is recommended.

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For this product, it's our understanding that no specific protocols are required. You can:

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