|Detection of Human and Rat LRP‑4 by Western Blot. Western blot shows lysates of human brain (cortex) tissue and rat cortical embryonic neuron/glial cells. PVDF Membrane was probed with 1 µg/mL of Sheep Anti-Human/Rat LRP‑4 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF5948) followed by HRP-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # HAF016). A specific band was detected for LRP‑4 at approximately 220 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 8.|
|LRP‑4 in Human Brainstem. LRP‑4 was detected in immersion fixed paraffin-embedded sections of human brainstem using Sheep Anti-Human/Rat LRP‑4 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF5948) at 3 µg/mL overnight at 4 °C. Tissue was stained using the Anti-Sheep HRP-DAB Cell & Tissue Staining Kit (brown; Catalog # CTS019) and counterstained with hematoxylin (blue). Specific staining was localized to neuronal cell bodies and processes. This application has not been tested in rat samples. View our protocol for Chromogenic IHC Staining of Paraffin-embedded Tissue Sections.|
LRP‑4 (Low density lipoprotein-related protein #4; also MEGF7 and LRP13) is a 220-270 kDa glycoprotein, member of the LDLR family of proteins. It is expressed on neurons, oocytes, spermatogonia and skeletal muscle cells, and binds multiple ligands, including WISE, apoE, MuSK and neuronal Agrin. It serves to negatively regulate Wnt signaling during development, and to cluster AChRs at neuromuscular junctions. Mature human LRP‑4 is an 1885 amino acid (aa) type I transmembrane glycoprotein. It contains a 1705 aa extracellular domain (ECD) (aa 21-1725) plus a 159 aa cytoplasmic region (aa 1747-1905). In the ECD, there are eight LDLR class A repeats (aa 26-350), two EGF-like repeats (aa 354-434) and 20 LDLR class B repeats that contain an intervening EGF-like domain (aa 480-1610). Over aa 18-344, human LRP‑4 shares 88% aa identity with mouse LRP‑4.