Butyrophilin-like 8 (BTNL8) is a member of the BTN/MOG Ig-superfamily and functions as a negative regulator of immune cell activation (1). Human BTNL8 is a 500 amino acid (aa) type I transmembrane glycoprotein that contains a signal peptide followed by an extracellular domain (ECD), a transmembrane region and a short cytoplasmic domain (2). The ECD of human BTNL8 shares 88% sequence identity with the ECD of mouse BTNL8. BTNL8 has two alternatively spliced forms: B7-like and BTN-like. Both isoforms of BTNL8 are expressed in a range of human tissues (3). The complete immunological function of BTNL molecules is only beginning to emerge. BTNL8 has been shown to be important in initiation of primary immune responses, suggesting a role in priming of naïve T lymphocytes (3). Down-regulation of BNTL8 mRNA levels has been associated with ulcerative colitis and colon cancer (4). BTNL8 are expressed in colon, lung, testis and neutrophils, and its expression is significantly decreased in ulcerative colitis, colonic tumors as compared to unaffected tissue (4). Soluble BTNL8-Fc fusion protein binds to resting, but not activated T cells. In vitro, BTNL8 co-stimulates T cell proliferation and cytokine production. In vivo injections of BTNL8-Fc significantly increases production of
Ag-specific IgG during the primary but not the secondary immune response (3).

References

Arnett, H.A. et al. (2007) J. Immunol. 178:1523.
Arnett, H.A. et al. (2009) Cytokine 46:370.
Chapoval, A.I. et al. (2013) Mol Immunol. 56:819.
Lebrero-Fernández C. et al. (2016) Immun Inflamm Dis. 4:191.

Long Name

Butyrophilin-like 8

Alternate Names

BTN9.2

Entrez Gene IDs

79908 (Human); 406160 (Rat)

Gene Symbol

BTNL8

UniProt

Q6UX41-1

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Product Specific Notices for Human BTNL8 Alexa Fluor™ Plus 680-conjugated Antibody

This product is provided under an intellectual property license from Life Technologies Corporation. The transfer of this product is conditioned on the buyer using the purchased product solely in research conducted by the buyer, excluding contract research or any fee for service research, and the buyer must not (1) use this product or its components for (a) diagnostic, therapeutic or prophylactic purposes; (b) testing, analysis or screening services, or information in return for compensation on a per-test basis; or (c) manufacturing or quality assurance or quality control, and/or (2) sell or transfer this product or its components for resale, whether or not 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, 5781 Van Allen Way, Carlsbad, CA 92008 USA or outlicensing@thermofisher.com.

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Human BTNL8 Alexa Fluor™ Plus 680-conjugated Antibody

R&D Systems, part of Bio-Techne | Catalog # FAB9359AFP680

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Background: BTNL8