The HMα2 antibody reacts with integrin α2 chain (CD49b), the 150- kDa transmembrane glycoprotein that non-covalently associates with the integrin β1 subunit (CD29) to form the integrin α2β1 complex known as VLA-2. VLA-2, a receptor for collagen and laminin, is expressed on some splenic CD4+ T lymphocytes and NK-T cells, intestinal intraepithelial and lamina propria lymphocytes, splenic NK cells, epithelial cells, and platelets, but it is not on thymocytes or Peyer's-patch or lymphnode lymphocytes. The expression of VLA-2 is upregulated on lymphocytes in response to mitogens. The HMα2 antibody has been reported to partially block the interaction of T-cell blasts, but not NK cells, with collagen. Purified HMα2 mAb blocks the staining of splenic NK cells by the anti-CD49b/Pan-NK Cells mAb DX5 (Cat. No. 553858, for the PE conjugate). Therefore, mAb HMα2 may be used like the DX5 mAb for identification of NK cells. Two-color analysis of CD49b expression on spleen leukocytes. C57BL/6 splenocytes were simultaneously stained with FITC-conjugated mAb M1/70 (anti-mouse CD11b, Cat. No. 557396/553310, both panels) and either purified hamster IgG1, κ isotype control mAb A19-3 (Cat. No. 553969, left panel) or purified HMα2 mAb (right panel), followed by PE-conjugated anti-hamster IgG mAb cocktail (Cat. No. 554056, both panels). Flow cytometry was performed on a BD FACScan™ Flow Cytometry System.
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