|Wnt‑5a in Mouse Embryonic Rib. Wnt‑5a was detected in immersion fixed paraffin-embedded sections of mouse embryonic rib using 15 µg/mL Mouse/Rat Wnt‑5a Antigen Affinity-purified Polyclonal Antibody (Catalog # AF645) overnight at 4 °C. Tissue was stained with the Anti-Goat HRP-DAB Cell & Tissue Staining Kit (brown; Catalog # CTS008) and counterstained with hematoxylin (blue). View our protocol for Chromogenic IHC Staining of Paraffin-embedded Tissue Sections.|
|Detection of Mouse Wnt‑5a by Western Blot. Western blot shows lysates of mouse brain and lactating mammary tissue. PVDF membrane was probed with 1 µg/mL of Mouse/Rat Wnt‑5a Antigen Affinity-purified Polyclonal Antibody (Catalog # AF645) followed by HRP-conjugated Anti-Goat IgG Secondary Antibody (Catalog # HAF019). A specific band was detected for Wnt‑5a at approximately 45 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 8.|
|Wnt‑5a in Mouse Embryo. Wnt‑5a was detected in immersion fixed frozen sections of mouse embryo using Mouse/Rat Wnt‑5a Antigen Affinity-purified Polyclonal Antibody (Catalog # AF645) at 15 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). View our protocol for Chromogenic IHC Staining of Frozen Tissue Sections.|
Wnt proteins are secreted glycoproteins that contain a conserved pattern of 23-24 cysteine residues. Wnts play critical roles in both carcinogenesis and embryonic development for a variety of organisms. Wnts bind to receptors of the Frizzled family, sometimes in conjunction with other membrane-associated proteins such as LRPs or proteoglycans. Downstream effects of Wnt signaling occur through different intracellular components, depending on which pathway is activated. Three pathways have been characterized: the canonical Wnt/ beta -catenin pathway, the Wnt/Ca2+ pathway, and the planar cell polarity (1-2).
Wnt-5a is part of the subgroup of Wnts that are not axis-inducing in Xenopus embryos and do not transform C57MG mammary epithelial cells. This subgroup is also implicated in the Wnt/Ca2+ pathway, playing roles in cell movements and cell adhesion (3). This non-canonical Wnt pathway can inhibit canonical Wnt/ beta -catenin signaling. In Wnt-5a deficient mouse embryos, beta -catenin accumulates in the limb bud suggesting that Wnt-5a normally promotes degradation of beta -catenin (4). Likewise, in Xenopus embryos Wnt-5a antagonizes the ability of the canonical Wnt subgroup to induce a secondary axis (5). Wnt-5a is implicated in various types of cancer and has complex roles. It acts as a tumor suppressor for mammary, B-cell, colon, and uroepithelial cancer cells but is up-regulated in melanomas, where expression levels correlate with severity of metastasis (3). Furthermore, aberrant Wnt-5a signaling results in other diseases such as rheumatoid arthritis (6). Like other developmental growth factors Wnt-5a has diverse roles in development. They are too numerous to enunciate here, as functions span from early anterior-posterior development and gastrulation movements to maintaining hematopoietic stem cell population, lung morphogenesis, and limb outgrowth. Mouse and human Wnt-5a share 97% amino acid identity.
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