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Updated: Dec 6, 2025

Screening and Identification of Small Peptides Targeting Fibroblast Growth Factor Receptor2 using a Phage Display Peptide Library
Published on: September 30, 2019
Dissecting the Interaction of FGF8 with Receptor FGFRL1
Lei Zhuang1, Monique Vogel1, Peter M Villiger2
1Department for BioMedical Research, University of Bern, 3008 Bern, Switzerland.
Fibroblast growth factor receptor-like 1 (FGFRL1) is crucial for kidney development, interacting with FGF8 to form nephrons. The Ig2 domain of FGFRL1 is key for this high-affinity binding during kidney formation.
Area of Science:
- Developmental Biology
- Molecular Biology
- Nephrology
Background:
- Fibroblast growth factor receptor-like 1 (FGFRL1) is a novel protein implicated in mammalian kidney development.
- FGFRL1 appears to regulate the transition from metanephric mesenchyme to epithelial renal vesicles, essential for nephron formation.
Purpose of the Study:
- To investigate the interaction between FGFRL1 and fibroblast growth factor 8 (FGF8) in kidney development.
- To identify the specific domain of FGFRL1 responsible for FGF8 binding.
Main Methods:
- Recombinant expression of various FGFRL1 extracellular domains (Ig123, Ig1, Ig2, Ig3, Ig12, Ig23, Ig13) in human cells.
- Enzyme-linked immunosorbent assay (ELISA) and surface plasmon resonance (SPR) to assess FGFRL1-FGF8 interactions.
- Biacore experiments to quantify binding affinity (KD).
Main Results:
- Polypeptides containing the Ig2 domain of FGFRL1 (Ig123, Ig12, Ig23, Ig2) exhibited high-affinity binding to FGF8.
- Constructs lacking the Ig2 domain showed poor interaction with FGF8.
- Calculated KD values for Ig2-containing constructs were in the range of 2-3 × 10-9 M.
Conclusions:
- FGFRL1 likely functions as a physiological receptor for FGF8 in the developing kidney.
- The Ig2 domain of FGFRL1 is the primary binding site for FGF8.
- FGF8 binding to FGFRL1 is crucial for driving nephron formation during kidney development.
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