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Mouse Monoclonal to CD180

G28-8 (IgG1)

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CD180, also known as RP105 (or Bgp95, LY64) is a type I membrane glycoprotein of Toll-like receptor (TLR) family. Its cytoplasmic tail is short and unlike the TLRs, it lacks the TIR domain. CD180 expression is dependent on the coexpression of its helper molecule, MD-1 , and mirrors that of TLR4 on antigen-presenting cells. CD180 regulates recognition of LPS and signaling in B cells, via interacting directly with the TLR4 signaling complex, inhibiting its ability to bind microbial ligands. Ligation of CD180 by monoclonal antibodies leads to B cell activation, upregulation of CD80/CD86, and increase in cell size.


The mouse monoclonal antibody G28-8 recognizes CD180, a 95-105 kDa TLR-like glycoprotein expressed on peripheral blood monocytes and dendritic cells, mantle zone B cells and marginal zone B cells, but very weakly on germinal center B cells.

Regulatory Status


Human tonsillar B cells

Species Reactivity:

  • Human

Negative Species:


  • Flow Cytometry
    Recommended dilution:2 μg/ml
  • Immunoprecipitation
  • Functional Application
    induction of B cell proliferation
Usage note:
Indicated dilutions are recommended starting points for use of this product. Working concentrations should be determined by the investigator.

General references

  • *Divanovic S, Trompette A, Atabani SF, Madan R, Golenbock DT, Visintin A, Finberg RW, Tarakhovsky A, Vogel SN, Belkaid Y, Kurt-Jones EA, Karp CL: Negative regulation of Toll-like receptor 4 signaling by the Toll-like receptor homolog RP105. Nat Immunol. 2005 Jun;6(6):571-8. [Abstract] [Full Text]
  • *Yazawa N, Fujimoto M, Sato S, Miyake K, Asano N, Nagai Y, Takeuchi O, Takeda K, Okochi H, Akira S, Tedder TF, Tamaki K: CD19 regulates innate immunity by the toll-like receptor RP105 signaling in B lymphocytes. Blood. 2003 Aug 15;102(4):1374-80. [Abstract] [Full Text]
  • *Divanovic S, Trompette A, Petiniot LK, Allen JL, Flick LM, Belkaid Y, Madan R, Haky JJ, Karp CL: Regulation of TLR4 signaling and the host interface with pathogens and danger: the role of RP105. J Leukoc Biol. 2007 Aug;82(2):265-71. [Abstract] [Full Text]
  • *Kikuchi Y, Koarada S, Tada Y, Ushiyama O, Morito F, Suzuki N, Ohta A, Horiuchi T, Miyake K, Nagasawa K: Difference in B cell activation between dermatomyositis and polymyositis: analysis of the expression of RP105 on peripheral blood B cells. Ann Rheum Dis. 2001 Dec;60(12):1137-40. [Abstract] [Full Text]
  • Product Specific References

  • *Valentine MA, Clark EA, Shu GL, Norris NA, Ledbetter JA: Antibody to a novel 95-kDa surface glycoprotein on human B cells induces calcium mobilization and B cell activation. J Immunol. 1988 Jun 15;140(12):4071-8. [Abstract]
  • *Clark EA, Shu GL, Lüscher B, Draves KE, Banchereau J, Ledbetter JA, Valentine MA: Activation of human B cells. Comparison of the signal transduced by IL-4 to four different competence signals. J Immunol. 1989 Dec 15;143(12):3873-80. [Abstract]
  • *Olson NE, Graves JD, Shu GL, Ryan EJ, Clark EA: Caspase activity is required for stimulated B lymphocytes to enter the cell cycle. J Immunol. 2003 Jun 15;170(12):6065-72. [Abstract] [Full Text]
  • For research use only. Not for drug, diagnostic or other use.

    Example Data

    G28-8 PE

    Fig. 1. Surface staining of human peripheral blood cells with anti-CD180 (G28-8) PE.

    G28-8 APC

    Fig. 2. Surface staining of human peripheral blood cells with anti-CD180 (G28-8) APC.

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