CD11b Antibody (OX-42) [PE]


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Reactivity RtSpecies Glossary
Applications Flow

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CD11b Antibody (OX-42) [PE] Summary

Mouse Monoclonal CD11b Antibody (OX-42) was made from rat peritoneal macrophages.
Microglia Marker, Macrophage Marker
NB100-65284 recognizes the rat equivalent of human CD11b, the receptor for the iC3b component of complement. The antigen is expressed on most macrophages, including resident and activated peritoneal macrophages and Kupffer cells and around 35% of alveolar macrophages. This CD11b antibody also labels dendritic cells, granulocytes and microglial cells in the brain. Clone MRC OX-42 has been reported as being suitable for use on paraffin-embedded material following PLP fixation (periodate-lysine-paraformaldehyde). Functionally, clone OX-42 inhibits complement mediated rosettes.
Protein G purified
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  • Flow Cytometry
Application Notes
Optimal dilution of this antibody should be experimentally determined.
Theoretical MW
127.9 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

Store at 4C in the dark.
0.05% Sodium Azide
Protein G purified

Alternate Names for CD11b Antibody (OX-42) [PE]

  • antigen CD11b (p170)
  • CD11 antigen-like family member B
  • CD11b antigen
  • CD11b
  • Cell surface glycoprotein MAC-1 subunit alpha
  • Complement component 3 receptor 3 subunit
  • CR-3 alpha chain
  • CR3A
  • CR3AMGC117044
  • Integrin alpha M
  • integrin alpha-M
  • integrin, alpha M (complement component 3 receptor 3 subunit)
  • Leukocyte adhesion receptor MO1
  • MAC-1
  • MAC1A
  • macrophage antigen alpha polypeptide
  • MO1A
  • neutrophil adherence receptor alpha-M subunit
  • Neutrophil adherence receptor
  • SLEB6


CD11b (integrin alpha M subunit) is a type I transmembrane glycoprotein. CD11b combines with the Integrin beta 2 subunit (CD18) to form the non-covalent heterodimer Integrin alpha M/beta 2, also known as Mac-1 and complement receptor type 3 (CR3). The CD11b/CD18 (Mac-1) heterodimer has a theoretical molecular weight of 127kDa but is often observed near 170kDa due to post translational modifications. Integrins are transmembrane proteins that mediate interactions between adhesion molecules on adjacent cells and/or the extracellular matrix. Integrins have diverse roles in several biological processes, including cell migration during development, wound healing, cell differentiation, and apoptosis. The particular integrin CD11b is known as a pro-inflammatory molecule given its ability to promote phagocyte cytotoxic functions while enhancing several effector molecules such as FcGR, uPAR, and CD14 (1). In macrophages, CpG-DNA stimulates lysosomal degradation and vacuolar acidification, subsequently promoting CD11b release via TLR9 (2). During an acute infection, high CD11b/Mac-1 expression on antigen-specific CD8 (+) T cells can signify recent activation of the immune system, whereas naive T cells and virus-specific memory CD8 (+) T cells express little or no Mac-1 when exposed to a virus (3). Variations at the ITGAM gene, which encodes for the CD11b chain of the Mac-1 integrin, is one of the main genetic risk factors involved in systemic lupus erythematosus /SLE disorder (4).


1. Rosetti, F., & Mayadas, T. N. (2016). The many faces of Mac-1 in autoimmune disease. Immunol Rev, 269(1), 175-193. doi:10.1111/imr.12373

2. Kim, D., Kim, T. H., Wu, G., Park, B. K., Ha, J. H., Kim, Y. S.,... Kwon, H. J. (2016). Extracellular Release of CD11b by TLR9 Stimulation in Macrophages. PLoS One, 11(3), e0150677. doi:10.1371/journal.pone.0150677

3. Christensen, J. E., Andreasen, S. O., Christensen, J. P., & Thomsen, A. R. (2001). CD11b expression as a marker to distinguish between recently activated effector CD8(+) T cells and memory cells. Int Immunol, 13(4), 593-600. doi:10.1093/intimm/13.4.593

4. Nath, S. K., Han, S., Kim-Howard, X., Kelly, J. A., Viswanathan, P., Gilkeson, G. S.,... Harley, J. B. (2008). A nonsynonymous functional variant in integrin-alpha(M) (encoded by ITGAM) is associated with systemic lupus erythematosus. Nat Genet, 40(2), 152-154. doi:10.1038/ng.71


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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Product General Protocols

Find general support by application which include: protocols, troubleshooting, illustrated assays, videos and webinars.

FAQs for CD11b Antibody (NB100-65284PE). (Showing 1 - 8 of 8 FAQ).

  1. I am looking for a Mac-1 (microglia cell marker) antibody to do immunostaining with my mouse brain and I checked, you have a lot of antibodies for this biomarker. I don't know which one is the best to be used for immunohistology on mouse brain tissue. Could you please help with this?
    • I would recommend NB110-89474. This antibody has been published in 11 scientific articles, including several times in IHC in mouse. As long as CD11b is expressed in your sample, it should work just fine and is backed by our 100% Novus Guarantee.
  2. What types of cells can this CD11b antibody be used as a marker for?
    • A study used this CD11b antibody to stain granulocytes in mouse uterine tissue in IHC. CD11b is also expressed on other leukocytes such as monocytes, macrophages, and natural killer cells.
  3. Do you know if this CD11b antibody can be used in CD11b positive cell depletion? 
    • This particular CD11b antibody is not reccomended for depletion studies due to the preservative used; however, our CD11b antibody NBP1-06650 is offered in a preservative free format and has been validated for blocking.
  4. Looking for a bone marrow macrophage marker can you recommend a CD11b antibody for ICC?
    • I would recommend NB110-89474 which is our most popular CD11b antibody and has been validated in ICC and cited in 18 publications.
  5. We need a CD11b antibody for IHC-P on mouse tissue conjugated to FITC, do you have one that will work?
    • We have 3 CD11b antibodies for IHC-P and just one CD11 b antibody we offer conjugated to FITC, NB110-89474F.
  6. The protocol says to do enzymatic antigen retrieval before incubating with the CD11b antibody, which enzyme is used?
    • The protocol is referencting the PIER method using Proteinase K as the enzyme.
  7. I'm not sure if this will work for me, can I get a free sample of your CD11b antibody to test?
    • We don't offer free samples but we do offer this CD11b antibody in a trial size of 0.025 ml at a reduced cost, all antibodies are backed by our 100% guarantee to work in all validated species and applications on the product's web page.
  8. Is CD11b antibody also staining neutrophils in the brain
    • CD11b is typically used as a marker for granulocytes and macrophages. You may need a combination of markers to specifically identify neutrophils

Secondary Antibodies


Isotype Controls

Other Available Formats

Alexa Fluor 350 NB100-65284AF350
Alexa Fluor 405 NB100-65284AF405
Alexa Fluor 488 NB100-65284AF488
Alexa Fluor 532 NB100-65284AF532
Alexa Fluor 594 NB100-65284AF594
Alexa Fluor 647 NB100-65284AF647
Alexa Fluor 700 NB100-65284AF700
Alexa Fluor 750 NB100-65284AF750
Allophycocyanin NB100-65284APC
Allophycocyanin/Cy7 NB100-65284APCCY7
Biotin NB100-65284B
DyLight 350 NB100-65284UV
DyLight 405 NB100-65284V
DyLight 488 NB100-65284G
DyLight 550 NB100-65284R
DyLight 594 NB100-65284DL594
DyLight 650 NB100-65284C
DyLight 680 NB100-65284FR
DyLight 755 NB100-65284IR
FITC NB100-65284F
HRP NB100-65284H
Janelia Fluor 549 NB100-65284JF549
Janelia Fluor 646 NB100-65284JF646
PE NB100-65284PE
PE/Atto594 NB100-65284PEATT594
PE/Cy5.5 NB100-65284PECY55
PE/Cy7 NB100-65284PECY7
PerCP NB100-65284PCP

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Blogs on CD11b.

  Read full blog post.

Antibody treatment can generate microglia-like cells from bone marrow
By Jennifer Sokolowski, MD, PhD.Microglia play important roles in the brain in both homeostatic and pathological conditions, acting to clear debris and dying cells. There is evidence to suggest that microglial dys...  Read full blog post.

TMEM 119 is a specific marker of microglia cells
By Jennifer Sokolowski, MD, PhD.Microglia are a major immune-cell component in the brain. They ingest and degrade dead cells, debris, and foreign material and interact with other immune cells to orchestrate centra...  Read full blog post.

Topics in CD11b: The innate immune response
Integrins are transmembrane receptors composed of alpha and beta chains, where beta-integrins are mainly expressed in leukocytes. Leukocytes are white blood cells that act in the immune system to defend our body against foreign pathogens.  Integrin...  Read full blog post.

CD11b - More than a microglial marker
The protein CD11b has been implicated in the various adhesion-related interactions of cells such as monocytes, macrophages, natural killer (NK) cells, and granulocytes. It is part of a heterodimer that consists of CD11b and CD18. It also modulates the...  Read full blog post.

CD11b: Marker for a New Type of B Cell that Participates in Cell-Mediated Immunity
Think B lymphocytes just produce antibodies? Think again! Although, of course, B cells are vital for the humoral immune response, many studies in recent years have begun to uncover antibody-independent actions of B cells: regulating T cells and thus a...  Read full blog post.

Adhesion Receptor Molecule CD11b/c is the Point of Entry for many Infectious Diseases
Pathogenic microorganisms utilize a variety of cell surface receptors to gain entry into host cells and to bypass the natural defense mechanisms. One of the most prominent receptors used in this fashion is the leukocyte adhesion receptor CD11b/c. This...  Read full blog post.

CD11b/CD18 and Neutrophil-Epithelial Interactions as Targets for Anti-Inflammatory Therapies
The beta-2 integrins, a family of four cell surface transmembrane glycoproteins expressed only on leukocytes, include CD11a/CD18, CD11b/CD18, CD11c/CD18, and CD11d/CD18. They consist of a common beta subunit (CD18) and homologous alpha subunits (CD11a...  Read full blog post.

The CD11b Antibody: A Marker for Microglial Cells
Microglia are the resident macrophages of the central nervous system, and the first line of immune defense. Pioneering antibody research in the 1990's identified the Integrin beta 2 protein (also called ITGB2, complement receptor 3, CR3, CD18, and Mac...  Read full blog post.

CD11b Expression, Leukocyte Adhesion and the Innate Immune System
CD11b is an integrin family member which pairs with CD18 to form the CR3 heterodimer. CD11b is expressed on the surface of many leukocytes including monocytes, neutrophils, natural killer cells, granulocytes and macrophages, as well as on 8% of spleen...  Read full blog post.

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Gene Symbol ITGAM