Detection of Mouse MAdCAM‑1 by Western Blot.Western blot shows lysates of NIH‑3T3 mouse embryonic fibroblast cell line. PVDF membrane was probed with 0.25 µg/mL of Goat Anti-Mouse MAdCAM‑1 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF993) followed by HRP-conjugated Anti-Goat IgG Secondary Antibody (Catalog # HAF019). A specific band was detected for MAdCAM‑1 at approximately 50 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.
MAdCAM‑1 in Mouse Intestine.MAdCAM‑1 was detected in perfusion fixed frozen sections of mouse intestine using Goat Anti-Mouse MAdCAM‑1 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF993) at 1.7 µg/mL overnight at 4 °C. Tissue was stained using the Anti-Goat HRP-DAB Cell & Tissue Staining Kit (brown; Catalog # CTS008) and counterstained with hematoxylin (blue). Specific labeling was localized to the endothelial cells of blood capillaries in intestinal villi. View our protocol for Chromogenic IHC Staining of Frozen Tissue Sections.
Mucosal addressin cell adhesion molecule-1 (MAdCAM-1) is an immunoglobulin (Ig) cell adhesion molecule family member. In addition to Ig domains, it contains a mucin-like domain and a membrane proximal domain with similarity to IgA. MAdCAM-1 is involved in lymphocyte homing to mucosal sites and is expressed on high endothelial venules (HEV) of both mesenteric lymph nodes and Peyer’s patches. It has also been found to be expressed on sinus-lining cells of the spleen. The integrin, alpha 4 beta 7, has been shown to function as the MAdCAM-1 receptor. The Ig domains of MAdCAM-1 have been found to be critical to alpha 4 beta 7 binding. The mucin domain has been shown to have activity in L-Selectin binding. MAdCAM-1 expression has been demonstrated to be up-regulated by TNF-alpha and IL-1 beta. MAdCAM-1 appears to play a role in inflammatory bowel disease (IBD) as its expression is highly up-regulated in IBD and most likely serves to recruit alpha 4 beta 7-expressing lymphocytes to the region. In vivo studies involving nonobese diabetic (NOD) mice have also suggested that MAdCAM-1/ alpha 4 beta 7 interaction plays a role in diabetes development in this model. Mouse MAdCAM-1 is a 405 amino acid (aa) residue protein with a 21 aa signal sequence, a 344 aa extracellular domain, a 20 aa transmembrane domain and a 20 aa cytoplasmic domain.
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