Human Fibroblast Growth Factor 4/α-Klotho for Endocrine FGF Signaling Reporter Assay System

This is an all-inclusive cell-based luciferase reporter assay kit targeting the Human Fibroblast Growth Factor Receptor 4 and α-Klotho (FGFR4/α-Klotho). INDIGO’s FGFR4/α-Klotho reporter assay utilizes proprietary mammalian cells that have been engineered to provide constitutive expression of the Human Fibroblast Growth Factor Receptor 4 and α-Klotho. In addition to FGFR4/α-Klotho Reporter Cells, this kit provides two optimized media for use during cell culture and in diluting the user’s test samples, a reference agonist, Luciferase Detection Reagent, and a cell culture-ready assay plate. The principal application of this assay is in the screening of test samples to quantify any functional activity, either agonist or antagonist, that they may exert against human FGFR4/α-Klotho. This kit provides researchers with clear, reproducible results, exceptional cell viability post-thaw, and consistent results lot to lot. Kits must be stored at -80C. Do not store in liquid nitrogen. Note: reporter cells cannot be refrozen or maintained in extended culture.

The family of Fibroblast Growth Factors (FGFs) comprise approximately 23 members that are related by core sequence and structure conservation, with the majority of FGFs being secreted signaling proteins. Secreted FGFs are predominantly autocrine and paracrine factors, with only three members evolved to function as endocrine factors. FGFs bind and activate FGF Receptors (FGFRs) which, themselves, are members of the family of high affinity tyrosine kinase receptors. Paracrine FGFs show high affinity towards the extracellular matrix (ECM) component heparin sulfate (HS) and are thus retained in the ECM and function locally. In contrast, the atypical endocrine subfamily of FGFs, that comprise FGF-19, FGF-21, and FGF-23, have reduced affinity for HS and can therefore escape from the ECM into the circulation to reach target distant organs. However, this subfamily typically requires association with members of the Klotho family of proteins as cofactors for efficient binding to their cognate receptor(s). FGF-23 is a principal regulator in the maintenance of serum phosphorus concentration by inhibiting renal tubular phosphate reabsorption. Unfortunately, various FGF-23-mediated disorders exist. The most common of these is X-linked hypophosphoatemia (XLH). Additional disorders of FGF-23 signaling include autosomal dominant and recessive hypophosphophatemic rickets, fibrous dysplasia, and tumor-induced osteomalacia. Consequently, FGF-23 and FGFR4/α-Klotho command considerable interest as therapeutic targets in drug development and drug safety screening. [INDIGO Catalog Nos. IB43101, IB43101-32, IB43102]

WARNING This product is not for human or veterinary use.