mac-1 Antibody

Introduction to Mac-1 Antibody

Mac-1 (Macrophage-1 antigen), also known as integrin αMβ2 or CD11b/CD18, is a leukocyte-specific receptor critical for immune functions such as adhesion, phagocytosis, and inflammatory signaling . Mac-1 antibodies are monoclonal or polyclonal reagents designed to target specific epitopes on the CD11b subunit, enabling researchers to study its biological roles or modulate its activity in therapeutic contexts . These antibodies are widely used to investigate Mac-1's interactions with ligands like complement component iC3b, extracellular dsRNA, and immune complexes .

Functional Mechanisms of Mac-1 Antibodies

Mac-1 antibodies exert effects through three primary mechanisms:

• Blocking ligand binding: Anti-Mac-1 (clone M1/70) inhibits complement receptor 3 (CR3)-mediated rosetting by binding to CD11b, preventing interactions with iC3b-opsonized targets .

• Receptor clustering: Antibody-induced clustering of Mac-1 triggers pro-inflammatory extracellular vesicle (EV) production in neutrophils, enhancing antibacterial responses .

• Co-receptor modulation: Mac-1 antibodies disrupt physical interactions with FcγRIIA, impairing immune complex (IC)-mediated cell spreading and migration .

Inhibition of Complement Receptors

• Anti-Mac-1 (M1/70) selectively blocks CR3-mediated adhesion to iC3bi-coated erythrocytes in murine macrophages and human polymorphonuclear leukocytes (PMNLs) .

• No inhibition observed for Fc receptor-mediated functions, confirming specificity for Mac-1 .

Role in Antibody-Dependent Cellular Cytotoxicity (ADCC)

• Mac-1 antibodies disrupt its interaction with FcγRIIA, reducing IC-mediated:

  • Cell spreading (↓60% vs. controls) .

  • Migration velocity (↓45% in THP-1 monocytes) .

  • Tumor cell cytolysis (↓70% in ADCC assays) .

Pro-Inflammatory Extracellular Vesicle Induction

Research Tools

• Flow cytometry: Anti-Mac-1 (AB-N05) enables quantification of CD11b expression in human/mouse cells .

• Immunoprecipitation: Used to study Mac-1 interactions with IRAK1, TRAF6, and TAK1 in signaling pathways .

Therapeutic Targeting

• Thrombosis: Anti-Mac-1 reduces occlusive thrombus formation by 70% in murine models .

• Viral infections: Antibodies block Mac-1–dsRNA interactions, suppressing NOX2 activation and cytokine storms .

Data Overview: Anti-Mac-1 Antibody Clones