The lymphocyte antigen 6 (Ly-6) complex was first described in mice and since its discovery over 20 genes related to the Ly-6 complex on chromosome 15 have been classified (1). The Ly-6 family is commonly used as a cell-surface differentiation marker on both normal and abnormal cells (2). Ly-6 complex, locus G (Ly-6G) and Ly-6 complex, locus C (Ly-6C) both belong to the murine Ly6/urokinase-type plasminogen activator receptor (uPAR) family of genes, which share a common structure (3). The Ly-6 family of proteins is characterized by a ~90 amino acid (aa) LU domain that consists of a three-finger structure formed by disulfide bonds (1,3). Additionally, many Ly6 proteins have a C-terminal GPI anchor, including Ly-6G/Ly-6C (1,3). Ly-6C protein has a molecular weight of 14 kDa and is expressed in some CD4+ and CD8+ T-cells, monocytes, neutrophils, and dendritic cells (1). Ly-6C has uniform expression in neutrophils but varies in monocytes where Ly-6Chi expression is specific for immature/inflammatory monocytes and Ly-6Clo expression identifies mature/residential monocytes (1,3). Ly-6G, on the other hand, is a protein with a molecular weight of 25 kDa with its expression uniquely restricted to neutrophils (1).

Expression of Ly-6G and Ly-6C, along with other lineage markers, help define specific cell types (2,4). For example, mouse myeloid derived suppressor cells (MDSCs), which play a role in inflammation and tumor development, are further subdivided into granulocytic (G-MDSCs) or monocytic (Mo-MDSCs) (4). Mo-MDSCs express Ly-6Chi along with CD11b, but are negative for Ly-6G, whereas G-MDSCs express Ly-6Clo/int,Ly-6Ghi , and CD11b (4).

The monoclonal antibody RB6-8C5 first identified granulocyte-differentiation antigen (Gr-1) which is primarily expressed on the surface of neutrophils and immature myeloid cells, and to a lesser extent on lymphocytes and macrophages (1). Gr-1 expression increases as neutrophils mature but remains is stably expressed in monocytes (1). The RB6-8C5 reacts with both Ly-6G and Ly-6C, whereas 1A8 antibody is specific for Ly-6G (1). Antibodies against Ly-6G, such as RB6-8C5 and 1A8, are commonly used to identify a role for neutrophils in mouse models of disease as they are efficient for quickly depleting neutrophils (1). RB6-8C5, however, also targets and depletes Ly-6Chi monocytes in addition to other Ly-6G-expressing cells (1).

References

1. Lee, P. Y., Wang, J. X., Parisini, E., Dascher, C. C., & Nigrovic, P. A. (2013). Ly6 family proteins in neutrophil biology. Journal of leukocyte biology. https://doi.org/10.1189/jlb.0113014

2. Bamezai A. (2004). Mouse Ly-6 proteins and their extended family: markers of cell differentiation and regulators of cell signaling. Archivum immunologiae et therapiae experimentalis.

3. Loughner, C. L., Bruford, E. A., McAndrews, M. S., Delp, E. E., Swamynathan, S., & Swamynathan, S. K. (2016). Organization, evolution and functions of the human and mouse Ly6/uPAR family genes. Human genomics. https://doi.org/10.1186/s40246-016-0074-2

4. Kong, Y. Y., Fuchsberger, M., Xiang, S. D., Apostolopoulos, V., & Plebanski, M. (2013). Myeloid derived suppressor cells and their role in diseases. Current medicinal chemistry. https://doi.org/10.2174/0929867311320110006

Long Name

A Myeloid Differentiation Antigen

Alternate Names

Gr-1

Gene Symbol

LY6G

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Product Documents for Ly-6G/Ly-6C Antibody (RM0064-6D17) [Alexa Fluor® 750]

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Product Specific Notices for Ly-6G/Ly-6C Antibody (RM0064-6D17) [Alexa Fluor® 750]

Alexa Fluor (R) products are provided under an intellectual property license from Life Technologies Corporation. The purchase of this product conveys to the buyer the non-transferable right to use the purchased product and components of the product only in research conducted by the buyer (whether the buyer is an academic or for-profit entity). The sale of this product is expressly conditioned on the buyer not using the product or its components, or any materials made using the product or its components, in any activity to generate revenue, which may include, but is not limited to use of the product or its components: (i) in manufacturing; (ii) to provide a service, information, or data in return for payment; (iii) for therapeutic, diagnostic or prophylactic purposes; or (iv) for resale, regardless of whether they are resold for use in research. For information on purchasing a license to this product for purposes other than as described above, contact Life Technologies Corporation, 5791 Van Allen Way, Carlsbad, CA 92008 USA or outlicensing@lifetech.com. This conjugate is made on demand. Actual recovery may vary from the stated volume of this product. The volume will be greater than or equal to the unit size stated on the datasheet.

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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Ly-6G/Ly-6C Antibody (RM0064-6D17) [Alexa Fluor® 750]

Novus Biologicals, part of Bio-Techne | Catalog # NBP2-11784AF750

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Background: Ly-6G (Gr-1)