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AB79559

Anti-CD81 antibody [M38]

4

(2 Reviews)

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(223 Publications)

Anti-CD81 antibody [M38] (ab79559) is a mouse monoclonal antibody detecting CD81 in Western Blot, Flow Cytometry, IHC-P. Suitable for Human.

- KO validated for confirmed specificity
- Over 140 publications
- Trusted since 2009

View Alternative Names

CD81, TAPA1, TSPAN28, CD81 antigen, 26 kDa cell surface protein TAPA-1, Target of the antiproliferative antibody 1, Tetraspanin-28, Tspan-28

6 Images
Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-CD81 antibody [M38] (AB79559)
  • IHC-P

Lab

Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-CD81 antibody [M38] (AB79559)

IHC image of CD81 staining in Human normal liver formalin fixed paraffin embedded tissue section, performed on a Leica Bond™ system using the standard protocol F. The section was pre-treated using heat mediated antigen retrieval with sodium citrate buffer (pH6, epitope retrieval solution 1) for 20 mins. The section was then incubated with ab79559, 5 μg/mL, 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.

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.

Flow Cytometry - Anti-CD81 antibody [M38] (AB79559)
  • Flow Cyt

Supplier Data

Flow Cytometry - Anti-CD81 antibody [M38] (AB79559)

Flow cytometry analysis using human peripheral blood cells with ab79559 at 4 μg/ml.

Flow Cytometry - Anti-CD81 antibody [M38] (AB79559)
  • Flow Cyt

Supplier Data

Flow Cytometry - Anti-CD81 antibody [M38] (AB79559)

Separation of human lymphocytes (red-filled) from neutrophil granulocytes (black-dashed) in flow cytometry analysis of human peripheral whole blood stained using ab79559 at 4 μg/ml.

Flow Cytometry - Anti-CD81 antibody [M38] (AB79559)
  • Flow Cyt

Lab

Flow Cytometry - Anti-CD81 antibody [M38] (AB79559)

Flow cytometry overlay histogram showing left Jurkat positive cells and right negative HepG2 stained with ab79559 (red line). The cells were incubated in 1x PBS containing 10% normal goat serum to block non-specific protein-protein interactionfollowed by the antibody (ab79559) (1x 106 in 100μl at 0.2 μg/ml (1/5000)) for 30min on ice.

The secondary antibody Goat Anti-Mouse IgG H&L (Alexa Fluor® 488) preadsorbed was incubated at 1/4000 for 30min on ice

Isotype control antibody (black line) was Mouse IgG1, kappa monoclonal [15-6E10A7] - Isotype Control used at the same concentration and conditions as the primary antibody. Unlabelled sample (blue line) was also used as a control.

Acquisition of >5000 events were collected using a 50 mW Blue laser (488nm) and 525/40 bandpass filter.

Flow Cytometry - Anti-CD81 antibody [M38] (AB79559)
  • Flow Cyt

Lab

Flow Cytometry - Anti-CD81 antibody [M38] (AB79559)

Flow cytometry overlay histogram showing wild-type HAP1 (green line) and CD81 knockout HAP1 stained with ab79559 (magenta line). The cells were incubated in 1x PBS containing 10% normal goat serum to block non-specific protein-protein interaction followed by the antibody (ab79559) (1x 106 in 100μl at 0.2 μg/ml (1/5000)) for 30min on ice.

The secondary antibody Goat Anti-Mouse IgG H&L (Alexa Fluor® 488) preadsorbed was incubated at 1/4000 for 30min on ice

Isotype control antibody Mouse IgG1, kappa monoclonal [15-6E10A7] - Isotype Control was used at the same concentration and conditions as the primary antibody (wild-type HAP1 - black line, CD81 knockout HAP1 - grey line). Unlabelled sample was also used as a control (this line is not shown for the purpose of simplicity).

Acquisition of >5000 events were collected using a 50 mW Blue laser (488nm) and 525/40 bandpass filter.

Western blot - Anti-CD81 antibody [M38] (AB79559)
  • WB

Supplier Data

Western blot - Anti-CD81 antibody [M38] (AB79559)

All lanes:

Western blot - Anti-CD81 antibody [M38] (ab79559) at 2 µg/mL

All lanes:

Jurkat (human T cell leukemia cell line from peripheral blood) whole cell lysate

Secondary

All lanes:

IRDye800-conjugated Anti-Mouse Secondary Antibody

Predicted band size: 25 kDa

Observed band size: 25 kDa

false

  • Biotin

    Biotin Anti-CD81 antibody [M38]

  • 660 APC

    APC Anti-CD81 antibody [M38]

  • 785 APC/Cy7®

    APC/Cy7® Anti-CD81 antibody [M38]

  • 519 FITC

    FITC Anti-CD81 antibody [M38]

Key facts

Host species

Mouse

Clonality

Monoclonal

Clone number

M38

Isotype

IgG1

Carrier free

No

Reacts with

Human

Applications

IHC-P, WB, Flow Cyt

applications

Immunogen

Cell preparation containing CD81 protein. The exact immunogen used to generate this antibody is proprietary information.

P60033

Reactivity data

{ "title": "Reactivity Data", "filters": { "stats": ["", "Species", "Dilution Info", "Notes"], "tabs": { "all-applications": {"fullname" : "All Applications", "shortname": "All Applications"}, "IHCP" : {"fullname" : "Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections)", "shortname":"IHC-P"}, "FlowCyt" : {"fullname" : "Flow Cytometry", "shortname":"Flow Cyt"}, "WB" : {"fullname" : "Western blot", "shortname":"WB"} }, "product-promise": { "all": "all", "testedAndGuaranteed": "tested", "guaranteed": "expected", "predicted": "predicted", "notRecommended": "not-recommended" } }, "values": { "Human": { "IHCP-species-checked": "testedAndGuaranteed", "IHCP-species-dilution-info": "5 µg/mL", "IHCP-species-notes": "<p></p> Perform heat-mediated antigen retrieval with citrate buffer pH 6 before commencing with IHC staining protocol.", "FlowCyt-species-checked": "testedAndGuaranteed", "FlowCyt-species-dilution-info": "1-4 µg/mL", "FlowCyt-species-notes": "<p><a href='/en-us/products/primary-antibodies/mouse-igg1-kappa-monoclonal-15-6e10a7-isotype-control-ab170190'>ab170190</a> - Mouse monoclonal IgG1, is suitable for use as an isotype control with this antibody.</p>", "WB-species-checked": "testedAndGuaranteed", "WB-species-dilution-info": "2 µg/mL", "WB-species-notes": "<p></p>" } } }

Product details

Product Specifications

Anti-CD81 antibody [M38] (ab79559) is a mouse monoclonal antibody and is validated for use in Flow Cyt, IHC-P, WB in human samples.
Anti-CD81 antibody [M38] (ab79559) specifically detects CD81 (UniProt ID: P60033; Molecular weight: 26kDa) and is sold in 100 µg selling sizes.

Quality and Validation

Abcam's high quality validation processes ensure Anti-CD81 antibody [M38] (ab79559) has high sensitivity and specificity.
The specificity of Anti-CD81 antibody [M38] (ab79559) has been confirmed by testing in knockout samples.
Anti-CD81 antibody [M38] (ab79559) has been cited over 142 times in peer reviewed journals and is trusted by the scientific community.

Related Products

Antibody clone M38 is also available pre-conjugated to a variety of labels for your convenience - APC/Cy7®, APC, Biotin, FITC, HRP (ab200565, ab233259, ab239238, ab239256).

Target Information

CD81 or TAPA1 is a tetraspanin protein that plays a significant role in oncology, particularly in the context of cancer cell proliferation and metastasis. CD81 or TAPA1 is highly expressed in several types of cancer cells and it is involved in various cellular processes, including cell adhesion, migration, and signal transduction. CD81 also contributes to the tumor microenvironment by facilitating interactions between cancer cells and their surroundings.

Properties and storage information

Form
Liquid
Purification technique
Affinity purification Protein A
Purification notes
ab79559 is purified from hybridoma culture supernatant by protein A affinity chromatography. Purity is > 95% (by SDS-PAGE).
Storage buffer
pH: 7.4 Preservative: 0.097% Sodium azide Constituents: PBS
Shipped at conditions
Blue Ice
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

Supplementary information

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

CD81 also known as TAPA-1 or 26 kDa protein is a member of the tetraspanin family featuring four transmembrane domains. The molecular weight of CD81 is approximately 26-28 kDa. This protein exhibits expression in numerous cell types such as leukocytes endothelial cells and epithelial tissues. CD81 plays a mechanical role by facilitating membrane protein interactions and contributing to cellular processes like adhesion and morphogenesis. Researchers have identified specific isoforms like M38 and labels like 1D6 CHAN in studies involving this target often analyzing CD81 through techniques like Western blot to determine expression levels and molecular weight.
Biological function summary

CD81 interacts with other tetraspanins and forms complexes within the membrane to regulate cellular signaling trafficking and adhesion. It participates in the assembly of larger tetraspanin-enriched microdomains which are important for efficient signaling and functional variety. These complexes modulate cell morphology proliferation and development influencing immune responses and pathogen entry to cells. The presence of CD81 in diverse tissues implies its involvement in a wide range of cellular processes forming essential complexes with proteins like integrins that further engage in tissue repair and immunological defense.

Pathways

CD81 plays significant roles in the immune system and viral entry pathways. It interacts with other proteins like CD9 and CD19 within the immune response pathways regulating lymphocyte activation and differentiation. CD81 is notably a coreceptor in the hepatitis C virus (HCV) entry pathway facilitating viral attachment and fusion into host cells. These interactions illustrate CD81's involvement in modulation of immune cell responses and influence on pathogen infection processes integrating into the complex cellular pathways important for maintaining homeostasis and response to external stimuli.

CD81 has connections to hepatitis C virus (HCV) infections and immunological disorders such as systemic lupus erythematosus (SLE). During HCV infection CD81 serves as an important entry point for the virus interacting with proteins like claudin-1 and scavenger receptor class B type I (SR-BI) enabling viral entry and replication within liver cells. In SLE alterations in CD81 expression can impact autoantibody production and lymphocyte behavior contributing to the disease's pathology. Understanding CD81's role in these diseases provides insight into therapeutic targets and potential interventions for managing infections and autoimmune responses.

Product protocols

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

Target data

Structural component of specialized membrane microdomains known as tetraspanin-enriched microdomains (TERMs), which act as platforms for receptor clustering and signaling. Essential for trafficking and compartmentalization of CD19 receptor on the surface of activated B cells (PubMed : 16449649, PubMed : 20237408, PubMed : 27881302). Upon initial encounter with microbial pathogens, enables the assembly of CD19-CR2/CD21 and B cell receptor (BCR) complexes at signaling TERMs, lowering the threshold dose of antigen required to trigger B cell clonal expansion and antibody production (PubMed : 15161911, PubMed : 20237408). In T cells, facilitates the localization of CD247/CD3 zeta at antigen-induced synapses with B cells, providing for costimulation and polarization toward T helper type 2 phenotype (PubMed : 22307619, PubMed : 23858057, PubMed : 8766544). Present in MHC class II compartments, may also play a role in antigen presentation (PubMed : 8409388, PubMed : 8766544). Can act both as positive and negative regulator of homotypic or heterotypic cell-cell fusion processes. Positively regulates sperm-egg fusion and may be involved in acrosome reaction (By similarity). In myoblasts, associates with CD9 and PTGFRN and inhibits myotube fusion during muscle regeneration (By similarity). In macrophages, associates with CD9 and beta-1 and beta-2 integrins, and prevents macrophage fusion into multinucleated giant cells specialized in ingesting complement-opsonized large particles (PubMed : 12796480). Also prevents the fusion of mononuclear cell progenitors into osteoclasts in charge of bone resorption (By similarity). May regulate the compartmentalization of enzymatic activities. In T cells, defines the subcellular localization of dNTPase SAMHD1 and permits its degradation by the proteasome, thereby controlling intracellular dNTP levels (PubMed : 28871089). Also involved in cell adhesion and motility. Positively regulates integrin-mediated adhesion of macrophages, particularly relevant for the inflammatory response in the lung (By similarity).. (Microbial infection) Acts as a receptor for hepatitis C virus (HCV) in hepatocytes. Association with CLDN1 and the CLDN1-CD81 receptor complex is essential for HCV entry into host cell.. (Microbial infection) Involved in SAMHD1-dependent restriction of HIV-1 replication. May support early replication of both R5- and X4-tropic HIV-1 viruses in T cells, likely via proteasome-dependent degradation of SAMHD1.. (Microbial infection) Specifically required for Plasmodium falciparum infectivity of hepatocytes, controlling sporozoite entry into hepatocytes via the parasitophorous vacuole and subsequent parasite differentiation to exoerythrocytic forms.
See full target information CD81

Publications (223)

Recent publications for all applications. Explore the full list and refine your search

Nature neuroscience 28:2201-2216 PubMed41044342

2025

Muscle-derived miR-126 regulates TDP-43 axonal local synthesis and NMJ integrity in ALS models.

Applications

Unspecified application

Species

Unspecified reactive species

Ariel Ionescu,Lior Ankol,Anand Ganapathy Subramaniam,Topaz Altman,Iddo Magen,Yahel Cohen,Yehuda Danino,Tal Gradus-Pery,Yoav Niv,Ori Bar Avi,Danielle Geller,Amjd Ibraheem,Ruilei Cheng,Noam Steinberg,Leenor Alfahel,Pauline Duc,Zeynep Ergul-Ulger,Doruk Arslan,Ersin Tan,Florence Rage,Nilo Riva,Angello Quattrini,Can Ebru Bekircan-Kurt,Adrian Israelson,Amir Dori,Eran Hornstein,Eran Perlson

Bioengineering & translational medicine 10:e70025 PubMed41030280

2025

Engineering biomimetic nanovesicles for PEBP1 mRNA delivery to inhibit ferroptosis in abdominal aortic aneurysm.

Applications

Unspecified application

Species

Unspecified reactive species

Lulu Chen,Bicheng Chen,Xiang Su

Nature communications 16:6960 PubMed40730843

2025

Single urinary extracellular vesicle proteomics identifies complement receptor CD35 as a biomarker for sepsis-associated acute kidney injury.

Applications

Unspecified application

Species

Unspecified reactive species

Ning Li,Tao-Tao Tang,Menglei Gu,Yu-Qi Fu,Wei-Wei Qian,Nan Nan Ma,An-Ran Shen,Tingting Zhu,Run-Bo Huo,Tao Zhang,Jian-Feng Xie,Lu Zhang,Bi-Cheng Liu,Lin-Li Lv

Human cell 38:124 PubMed40614007

2025

Exosomes derived from human umbilical cord mesenchymal stem cells inhibit hepatocyte pyroptosis via miR-423-5p/ZBP1 in acute liver failure.

Applications

Unspecified application

Species

Unspecified reactive species

Dan Xie,Lina Yu,Ziyang Wang,Gongqin Qiu,Shi Ouyang

Journal of extracellular vesicles 14:e70088 PubMed40511723

2025

Enhanced Early Detection of Colorectal Cancer via Blood Biomarker Combinations Identified Through Extracellular Vesicle Isolation and Artificial Intelligence Analysis.

Applications

Unspecified application

Species

Unspecified reactive species

Bonhan Koo,Young Il Kim,Minju Lee,Seok-Byung Lim,Yong Shin

Stem cells international 2025:5091529 PubMed40476182

2025

miR-1275 Delivered via Mesenchymal Stem Cell-Derived Extracellular Vesicles Regulates ER-Phagy Through AXIN2 in Nucleus Pulposus Cells.

Applications

Unspecified application

Species

Unspecified reactive species

Zhiwu Dong,Hailong Zhang,Wenwei Yang,Keliang Huang,Xin Zhang,Lianxiang Xing,Ying Zhang,Kewen Zhao

Scientific reports 15:19383 PubMed40461530

2025

Small extracellular vesicles from human bone marrow mesenchymal stromal cells enhance migration and regulate reparative gene expression in dermal fibroblasts.

Applications

Unspecified application

Species

Unspecified reactive species

Rui Lei,Tamiris Borges da Silva,Zhanfeng Cui,Hua Ye

Cell stress & chaperones 30:100081 PubMed40345640

2025

COL5A2-mediated endoplasmic reticulum stress promotes macrophage M2 polarization in lung adenocarcinoma.

Applications

Unspecified application

Species

Unspecified reactive species

Gaozhong Sun,Yanzhe Wang,Kewei Ni,Jian Shen,Dongdong Liu,Haitao Wang

Cancer immunology, immunotherapy : CII 74:193 PubMed40343498

2025

Osteosarcoma cell-derived CCL2 facilitates lung metastasis via accumulation of tumor-associated macrophages.

Applications

Unspecified application

Species

Unspecified reactive species

Hiroya Kondo,Hiroshi Tazawa,Tomohiro Fujiwara,Aki Yoshida,Miho Kure,Koji Demiya,Nobuhiko Kanaya,Toshiaki Hata,Koji Uotani,Joe Hasei,Toshiyuki Kunisada,Shunsuke Kagawa,Yusuke Yoshioka,Toshifumi Ozaki,Toshiyoshi Fujiwara

Cell death discovery 11:198 PubMed40280913

2025

Exosomes derived from ccRCC cells confers fibroblasts activation to foster tumor progression through Warburg effect by downregulating PANK3.

Applications

Unspecified application

Species

Unspecified reactive species

Yang Yang,Cheng Qiang,Zhu Jie,Han Ce,Huang Yan,Li Xiu-Bin,Fan Wen-Mei,Zhang Xu,Gao Yu
View all publications

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