HLA G Antibody (MEM-G/4) [Allophycocyanin/Cy7]

Novus Biologicals, part of Bio-Techne | Catalog # NB500-533APCCY7

Novus Biologicals, part of Bio-Techne
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Key Product Details

Species Reactivity

Human

Applications

Flow Cytometry

Label

Allophycocyanin/Cy7 (Excitation = 650;755 nm, Emission = 767 nm)

Antibody Source

Monoclonal Mouse IgG1 Clone # MEM-G/4

Concentration

Please see the vial label for concentration. If unlisted please contact technical services.

View all HLA-G Antibodies »

Product Specifications

Immunogen

Recombinant human HLA G Antibody (MEM-G/4) denaturated heavy chain.

Localization

Cell Membrane

Specificity

The antibody MEM-G/4 reacts with denaturated HLA-G heavy chain. The recognized epitope is present only on HLA-G1, -G2 and -G5 molecules. HLA-G belongs to the MHC Class I molecules (MHC Class Ib; nonclassical) and it is expressed on the surface of trophoblast cells.

Clonality

Monoclonal

Host

Mouse

Isotype

IgG1

Theoretical MW

39 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.

Applications for HLA G Antibody (MEM-G/4) [Allophycocyanin/Cy7]

Application
Recommended Usage

Flow Cytometry

Optimal dilutions of this antibody should be experimentally determined.
Application Notes
Optimal dilution of this antibody should be experimentally determined. For optimal results using our Tandem dyes, please avoid prolonged exposure to light or extreme temperature fluctuations. These can lead to irreversible degradation or decoupling. When staining intracellular targets, specific attention to the fixation and permeabilization steps in your flow protocol may be required. Please contact our technical support team at technical@novusbio.com if you have any questions.

Formulation, Preparation, and Storage

Purification

Protein A purified

Formulation

PBS

Preservative

0.05% Sodium Azide

Concentration

Please see the vial label for concentration. If unlisted please contact technical services.

Shipping

The product is shipped with polar packs. Upon receipt, store it immediately at the temperature recommended below.

Stability & Storage

Store at 4C in the dark. Do not freeze.

Background: HLA-G

Human leukocyte antigen (HLA)-G is a non-classical major histocompatibility complex (MHC) class I gene belonging to the HLA class I family. The HLA class I family is subdivided into the classical (HLA-Ia) antigens comprised of HLA-A, -B, and -C molecules and the nonclassical (HLA-Ib) group including the HLA-E, -F, and -G molecules. Seven different splice variants of HLA-G have been observed including four membrane isoforms (HLA-G1, HLA-G2, HLA-G3, and HLA-G4) and three soluble isoforms (HLA-G5, HLA-G6 and HLA-G7). Proteolytic processing of HLA-G1 by metalloproteinases (MMPs) such as MMP-2 produces the soluble isoform, shedding HLA-G1. The HLA-G1 and HLA-G5 isoforms share a similar confirmation to the classical MHC class I protein, consisting of three extracellular domains including alpha1, alpha2, and alpha3 associated with Beta-2-microglobulin (B2M). Other HLA-G variants are shorter, missing one or two of the globular domains and are not bound to B2M. HLA-G receptors include KIR2DL4 (CD158d), with the highest affinity for ILT2 (LILRB1, CD85j) and ILT4 (LILRB2, CD85d) (1,2).

Discovered in cytotrophoblasts, HLA-G is involved in fetal maternal immune tolerance and some studies have linked its downregulation with severe preeclampsia (3). HLA-G mediated immune suppression works by impeding cell proliferation, differentiation, cytotoxicity, cytokine secretion and chemotaxis; and activation of regulatory cells and MDSCs or M2 type macrophage. HLA-G is constitutively expressed in immune-privileged sites such as pancreatic islets, mesenchymal stem cells (MSCs) and the cornea. Upregulation of HLA-G occurs in pathological states including cancer, allo-transplantations, viral infections, autoimmune and inflammatory diseases (4). In cancer, HLA-G expression is induced by hypoxia and has been correlated with advanced tumor stage, tumor metastasis, and poor therapeutic response and survival. HLA-G is an attractive tumor associated-antigen (TAA) for immunotherapy and is considered a major immune checkpoint (ICP).

References

1. Loustau, M., Anna, F., Drean, R., Lecomte, M., Langlade-Demoyen, P., & Caumartin, J. (2020). HLA-G Neo-Expression on Tumors. Front Immunol, 11:1685. PMID: 32922387

2. Lin A, Yan WH. (2018) Heterogeneity of HLA-G Expression in Cancers: Facing the Challenges. Front Immunol. 9:2164. PMID: 30319626

3. Djurisic S, Hviid TV. (2014) HLA Class Ib Molecules and Immune Cells in Pregnancy and Preeclampsia. Front Immunol. 5:652. PMID: 25566263

4. Lila N, Rouas-Freiss N, Dausset J, Carpentier A, Carosella ED. (2001) Soluble HLA-G protein secreted by allo-specific CD4+ T cells suppresses the allo-proliferative response: a CD4+ T cell regulatory mechanism. Proc Natl Acad Sci U S A. 98(21):12150-12155. PMID: 11572934

Long Name

Major Histocompatibility Complex, Class I, G

Alternate Names

HLA G, HLA-6.0, HLAG, MHC Class I Antigen G, MHC-G

Gene Symbol

HLA-G

Additional HLA-G Products

Product Documents for HLA G Antibody (MEM-G/4) [Allophycocyanin/Cy7]

Product Datasheets

Certificate of Analysis

To download a Certificate of Analysis, please enter a lot number in the search box below.

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Product Specific Notices for HLA G Antibody (MEM-G/4) [Allophycocyanin/Cy7]

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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