The CH3A4A7 monoclonal antibody reacts with an extracellular epitope on human CD344 which is also known as Frizzled family receptor 4 (FZD4) or Frizzled-4. CD344 is a member of the Frizzled family of proteins within the G protein-coupled receptor (GPCR) superfamily. CD344 is a receptor for Wnt proteins and participates in the activation of the Wnt/beta-catenin pathway (canonical Wnt signaling). Patients with familial exudative vitreoretinopathy (FEVR) carry mutations in Frizzled-4. This disease is characterized by retinal degeneration and hearing loss. On tissues, CD344 is almost ubiquitously expressed. CD344 is highly expressed in adult heart and skeletal muscle. Flow Cytometric and Immunohistochemical Analysis of CD344 Expression. Panel A: Flow cytometric analysis of CD344 expression on human cell lines. Cells from the Weri-RB-1 Retinoblastoma Cell Line (ATCC HTB-169, solid line histogram) and Daudi Burkitt's Lymphoma Cell Line (ATCC CCL-213, dashed line histogram) were stained with Purified Mouse Anti-Human CD344 antibody (Cat. No. 563657). The cells were then washed and stained with PE Polyclonal Goat Anti-Mouse Ig (Cat. No.550589). The fluorescence histograms were derived from gated events with the forward and side light-scatter characteristics of viable cells. Flow cytometric analysis was performed using a BD FACSCanto™ II Flow Cytometer System. Panel B: Immunohistochemical analysis of CD344 expression by cardiac muscle. Acetone-fixed, frozen human heart sections were stained with either Purified Mouse IgG1 κ Isotype Control (Cat. No.550878, Left Image) or Purified Mouse Anti-Human CD344 antibody (Right Image). A three-step staining procedure that employed Biotin Goat Anti-Mouse Immunoglobulin (Cat. No. 550337), Streptavidin-Horseradish Peroxidase (HRP) (Cat. No. 550946), and the DAB Substrate Kit (Cat. No. 550880) was used to develop the primary staining reagents. Original magnification:40x.
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