CD8 Antibody (PT36A)

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Flow Cytometry: Cd8a Antibody (PT36A) [NBP2-60965] - Obtained with pig leukocytes

Product Details

Summary
Reactivity PoSpecies Glossary
Applications Flow, IHC, IHC-Fr
Clone
PT36A
Clonality
Monoclonal
Host
Mouse
Conjugate
Unconjugated
Concentration
1 mg/ml

Order Details

CD8 Antibody (PT36A) Summary

Immunogen
CD8 Antibody (PT36A) was developed against porcine mononuclear cells
Isotype
IgG1
Clonality
Monoclonal
Host
Mouse
Gene
CD8A
Purity
N/A
Innovator's Reward
Test in a species/application not listed above to receive a full credit towards a future purchase.

Applications/Dilutions

Dilutions
  • Flow Cytometry 1:10 - 1:1000
  • Immunohistochemistry 1:10 - 1:500
  • Immunohistochemistry-Frozen 1:10 - 1:500
Theoretical MW
26 kDa.
Disclaimer note: The observed molecular weight of the protein may vary from the listed predicted molecular weight due to post translational modifications, post translation cleavages, relative charges, and other experimental factors.

Packaging, Storage & Formulations

Storage
Store at 4C short term. Aliquot and store at -20C long term. Avoid freeze-thaw cycles.
Buffer
Ascites
Preservative
0.09% Sodium Azide
Concentration
1 mg/ml
Purity
N/A

Notes

This monoclonal antibody is made in ascites form using mice. The ascites is collected and centrifuged to remove cells and large particles. The ascitic fluid is purified further by filtration through sequential filters with the last filter at 2 um. The concentration of the monoclonal antibody present in the ascites is determined with commercial radial immunodiffusion kits (1mg/ml).

Alternate Names for CD8 Antibody (PT36A)

  • CD_antigen: CD8a
  • CD8 antigen, alpha polypeptide (p32)
  • CD8
  • CD8a molecule
  • CD8A
  • Leu2 T-lymphocyte antigen
  • LEU2
  • MAL
  • OKT8 T-cell antigen
  • p32
  • T cell co-receptor
  • T8 T-cell antigen
  • T-cell antigen Leu2
  • T-cell surface glycoprotein CD8 alpha chain
  • T-lymphocyte differentiation antigen T8/Leu-2

Background

CD8, also known as Leu-2 or T8 in human and Lyt2 or Lyt3 in mouse, is a cell surface glycoprotein belonging to the immunoglobulin supergene family (1, 2). CD8 is expressed on cytotoxic T-lymphocytes (T-cells), most thymocytes, between 35-45% of peripheral blood lymphocytes, and a population of natural killer (NK) cells (1, 2). The CD8 molecule consists of disulfide-linked alpha (alpha) and beta (beta) chains that present on T-cells as either CD8alphaalpha homodimers or CD8alphabeta heterodimers (1, 3). Both alpha and beta chains consist of a signaling sequence, an extracellular Ig-like domain, a membrane proximal stalk region, a transmembrane domain, and a cytoplasmic tail (3). Human CD8alpha is processed as 235 amino acids (aa) in length with a theoretical molecular weight of ~26 kDa, while mouse CD8alpha is 247 aa and has a theoretical molecular weight of 27.5 kDa (4, 5). Functionally, CD8 acts as an antigen coreceptor on cytotoxic T-cells and interacts with the major histocompatibility complex (MHC) class I molecules on antigen presenting cells (APCs), mediating cell-cell interactions within the immune system. Conversely, CD4 molecules interact with antigens presented on MHC class II molecules and are activated to become helper T-cells (TH) (1,2). Interestingly, thymocytes can transiently express both CD4 and CD8 during the maturation process (2). Furthermore, the cytoplasmic tail of CD8 has a Lck (lymphocyte-specific protein tyrosine kinase) binding domain where Lck interacts with CD8, initiating a phosphorylation cascade that activates transcription factors and promotes T-cell activation (6). More specifically, CD8alphabeta functions as a T-cell co-receptor, while CD8alphaalpha promotes T-cell survival and differentiation (7).

Given its role in the immune system, CD8-deficiency in T-cells is a hallmark of many diseases and pathologies (8-10). Specifically, CD8+ T-cell deficiency is prevalent in chronic autoimmune diseases including multiple sclerosis, rheumatoid arthritis, ulcerative colitis, Crohn's disease, type 1 diabetes mellitus, and Graves' disease (8). Furthermore, cancers or chronic infection can lead to CD8 T-cell exhaustion as the continual antigen presentation and inflammatory signals eventually cause the CD8+ T-cells to lose functionality (9, 10). However, animal models and clinical studies have suggested that T-cells are capable of being reinvigorated using inhibitory receptor blockade resulting in better disease outcomes and these exhausted T-cells may be a potential therapeutic target (9, 10).

Alternative names for CD8 includes CD antigen: CD8a, CD8 antigen, alpha polypeptide (p32), CD8a molecule, CD8A, Leu2 T-lymphocyte antigen, LEU2, MAL, OKT8 T-cell antigen, p32, T cell co-receptor, T8 T-cell antigen, T-cell antigen Leu2, T-cell surface glycoprotein CD8 alpha chain, and T-lymphocyte differentiation antigen T8/Leu-2.

References

1. Littman D. R. (1987). The structure of the CD4 and CD8 genes. Annual review of immunology. https://doi.org/10.1146/annurev.iy.05.040187.003021

2. Naeim F. (2008). Chapter 2- Principles of Immunophenotyping. Hematopathology. https://doi.org/10.1016/B978-0-12-370607-2.00002-8.

3. Gao, G. F., & Jakobsen, B. K. (2000). Molecular interactions of coreceptor CD8 and MHC class I: the molecular basis for functional coordination with the T-cell receptor. Immunology today. https://doi.org/10.1016/s0167-5699(00)01750-3

4. UniProt (P01732)

5. UniProt (P01731)

6. Kappes D. J. (2007). CD4 and CD8: hogging all the Lck. Immunity. https://doi.org/10.1016/j.immuni.2007.11.002

7. Gangadharan, D., & Cheroutre, H. (2004). The CD8 isoform CD8alphaalpha is not a functional homologue of the TCR co-receptor CD8alphabeta. Current opinion in immunology. https://doi.org/10.1016/j.coi.2004.03.015

8. Pender M. P. (2012). CD8+ T-Cell Deficiency, Epstein-Barr Virus Infection, Vitamin D Deficiency, and Steps to Autoimmunity: A Unifying Hypothesis. Autoimmune diseases. https://doi.org/10.1155/2012/189096

9. Kurachi M. (2019). CD8+ T cell exhaustion. Seminars in immunopathology. https://doi.org/10.1007/s00281-019-00744-5

10. Hashimoto, M., Kamphorst, A. O., Im, S. J., Kissick, H. T., Pillai, R. N., Ramalingam, S. S., Araki, K., & Ahmed, R. (2018). CD8 T Cell Exhaustion in Chronic Infection and Cancer: Opportunities for Interventions. Annual review of medicine. https://doi.org/10.1146/annurev-med-012017-043208

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.

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Tired T cells: Hypoxia Drives T cell Exhaustion in the Tumor Microenvironment
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By Jamshed Arslan, Pharm D, PhDWhat do nuts, dairy and red meat have in common? In addition to the fact that they are all edible, one of the answers is L-arginine. This amino acid improves T cell’s respons...  Read full blog post.

Harnessing Natural Killer Cell Activity for Anti-Tumor Immunotherapy
By Victoria Osinski, PhDWhat’s “Natural” About Natural Killer (NK) Cells?For immunologists, the term cytotoxicity often conjures up images of an army of antigen specific CD8+ T cells deploying to ...  Read full blog post.

Early T cell response is associated with mild COVID-19 and rapid SARS-CoV-2 clearance
Jamshed Arslan, Pharm D, PhD SARS-CoV-2 induces both humoral and cellular immunity. A vaccine or natural infection invokes SARS-CoV-2-specific humoral components (antibodies from activated B cells) and cellular resp...  Read full blog post.


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Success of combined IL-10 and IL-12 therapy in colon cancer depends on IFN-gamma and gut barrier integrity
By Jamshed Arslan, Pharm. D., PhD. Colon cancer is responsible for over 600,000 deaths per year worldwide. Colon cancer can be classified into two categories: mismatch repair (MMR)-deficient and MMR-proficient cancers...  Read full blog post.

mTOR Signaling and the Tumor Microenvironment
By Yoskaly Lazo-Fernandez, PhD The mammalian target of rapamycin (mTOR) is a conserved serine/threonine kinase that, as a member of two distinct intracellular protein complexes, mTORC1 and mTORC2, regulates protein ...  Read full blog post.

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Bioinformatics

Gene Symbol CD8A