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Home >> Antibodies >> CD18 Antibody / ITGB2 Polyclonal Antibody

CD18 Antibody / ITGB2 Polyclonal Antibody (R31562)

  Catalog No Formulation Size Price (USD)  
Image R31562 0.5mg/ml if reconstituted with 0.2ml sterile DI water 100 ug 449
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CD18 Antibody in Human Tonsil IF. Immunofluorescence staining of FFPE human tonsil tissue with CD18 Antibody at 5 ug/ml. Heat-induced epitope retrieval was performed in pH 8 EDTA buffer, followed by blocking with 10% goat serum and overnight primary antibody incubation at 4oC. DyLight 488-conjugated goat anti-rabbit IgG was used for detection. Green CD18 signal is visible in discrete populations of cells throughout the tonsillar lymphoid tissue, with nuclei counterstained blue. This ITGB2 Polyclonal Antibody demonstrates heterogeneous CD18 expression among cells of human tonsil.
CD18 Antibody in Human Intestinal Cancer IHC. Immunohistochemistry staining of FFPE human intestinal cancer tissue with CD18 Antibody at 2 ug/ml. Heat-induced epitope retrieval was performed in pH 8 EDTA buffer before antibody staining. Strong brown immunoreactivity is concentrated in a population of infiltrating cells within the tissue, while surrounding structures show substantially less staining. This ITGB2 Polyclonal Antibody demonstrates CD18 detection in immune-cell-rich regions of human intestinal cancer tissue.
CD18 Antibody in Human Lung Cancer IHC. Immunohistochemistry staining of FFPE human lung cancer tissue with CD18 Antibody at 2 ug/ml. Heat-induced epitope retrieval was performed in pH 8 EDTA buffer before antibody staining. The image shows an intensely CD18-positive cluster of infiltrating cells surrounded by more weakly stained tissue, producing strong contrast between the positive leukocyte population and adjacent structures. This staining supports tissue detection of integrin beta 2 with the ITGB2 Polyclonal Antibody.
CD18 Antibody Western Blot of Jurkat and HeLa Cells. Western blot testing of human Jurkat (lane 1) and HeLa (lane 2) whole cell lysates with CD18 Antibody at 0.5 ug/ml. A strong band is detected in Jurkat cells at approximately 85-90 kDa, consistent with glycosylated CD18/ITGB2, while the corresponding signal is essentially absent from HeLa cells. A prominent lower band near approximately 20 kDa is present in the HeLa lane and is inconsistent with full-length CD18. The differential target-sized signal demonstrates detection of ITGB2 in Jurkat cells by this ITGB2 Polyclonal Antibody.
Species Reactivity Human
Format Antigen affinity purified
Host Rabbit
Clonality Polyclonal (rabbit origin)
Isotype Rabbit IgG
Purity Antigen affinity
Buffer Lyophilized from 1X PBS with 2.5% BSA and 0.025% sodium azide
UniProt P05107
Localization Cytoplasmic, membrane
Applications Western Blot : 0.5-1ug/ml
Immunohistochemistry (FFPE) : 2-5ug/ml
Immunofluorescence : 5ug/ml
Limitations This CD18 Antibody / ITGB2 Polyclonal Antibody is available for research use only.
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Description

CD18 Antibody recognizes integrin beta 2, a transmembrane adhesion receptor subunit encoded by the ITGB2 gene. CD18 is expressed predominantly by leukocytes and associates with several different alpha integrin subunits to form members of the beta 2 integrin family. These heterodimers include LFA-1 (CD11a/CD18), Mac-1 (CD11b/CD18), complement receptor 4 (CD11c/CD18), and alpha D beta 2 (CD11d/CD18). Because CD18 is the shared beta chain of these receptors, it has broad importance in leukocyte adhesion and immune cell function.

Integrin beta 2 is a type I transmembrane glycoprotein containing a large extracellular region, a single transmembrane segment, and a short cytoplasmic tail. Association with an alpha integrin chain creates a functional heterodimer capable of transmitting signals bidirectionally across the plasma membrane. Regulation of integrin conformation controls ligand affinity, while ligand engagement can initiate intracellular signaling and cytoskeletal changes that influence cell adhesion, spreading, and migration.

CD18-containing integrins interact with multiple ligands involved in leukocyte trafficking and immune responses. LFA-1 binds intercellular adhesion molecules such as ICAM1, while other beta 2 integrins recognize complement components and additional extracellular or cell-surface ligands. Through these interactions, ITGB2 contributes to leukocyte adhesion to vascular endothelium, transendothelial migration, immune synapse formation, phagocytosis, and inflammatory responses.

The physiological importance of ITGB2 is illustrated by leukocyte adhesion deficiency type I, which results from pathogenic variants affecting CD18 expression or function. Impaired beta 2 integrin activity compromises firm leukocyte adhesion and migration from the circulation into tissues, resulting in defective immune responses. ITGB2 and its associated integrins are therefore widely studied in leukocyte trafficking, innate and adaptive immunity, inflammation, cell adhesion, and immune disorders.

Although CD18 has historically been associated with the term LFA-1, CD18 itself is not unique to LFA-1. LFA-1 specifically consists of the CD11a alpha chain paired with CD18, whereas ITGB2 also forms heterodimers with CD11b, CD11c, and CD11d. Distinguishing the shared CD18 subunit from individual beta 2 integrin heterodimers is important when interpreting ITGB2 expression and function.

A CD18 Antibody can be used to investigate expression of the shared beta 2 integrin subunit, while an ITGB2 Polyclonal Antibody provides a polyclonal reagent for studies of leukocyte adhesion and beta 2 integrin biology.

For additional antibodies targeting cluster of differentiation proteins, see our CD Antibodies page.

Application Notes

The stated application concentrations are suggested starting amounts. Titration of the CD18 Antibody / ITGB2 Polyclonal Antibody may be required due to differences in protocols and secondary/substrate sensitivity.

Immunogen

Human partial recombinant protein (AA 404-769) was used as the immunogen for this CD18 Antibody.

Storage

After reconstitution, the CD18 Antibody can be stored for up to one month at 4oC. For long-term, aliquot and store at -20oC. Avoid repeated freezing and thawing.

Alternate Names

ITGB2 antibody, Integrin Beta 2 antibody, LFA-1 Beta Chain antibody, Leukocyte Integrin Beta 2 antibody, Complement Receptor Beta Chain antibody

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