1. Agonist-induced formation of FGFR1 homodimers and signaling differ among members of the FGF family
- Author
-
Dasiel O. Borroto-Escuela, Giuseppa Mudò, Natale Belluardo, Kjell Fuxe, Francisco Ciruela, Luigi F. Agnati, Manuel Narváez, Alexander O. Tarakanov, Mileidys Pérez-Alea, Wilber Romero-Fernandez, Romero-Fernandez, W, Borroto-Escuela, DO, Tarakanov, AO, Mudó, G, Narvaez, M, Pérez-Alea, M, Agnati, LF, Ciruela, F, Belluardo, N, and Fuxe, K
- Subjects
Agonist ,MAPK/ERK pathway ,medicine.drug_class ,Biophysics ,Settore BIO/11 - Biologia Molecolare ,Biology ,Ligands ,Fibroblast growth factor ,Settore BIO/09 - Fisiologia ,Biochemistry ,chemistry.chemical_compound ,Fluorescence Resonance Energy Transfer ,medicine ,Humans ,Receptor, Fibroblast Growth Factor, Type 1 ,Molecular Biology ,Mitogen-Activated Protein Kinase 1 ,Mitogen-Activated Protein Kinase 3 ,Fibroblast growth factor receptor 1 ,HEK 293 cells ,Autophosphorylation ,Cell Biology ,Heparan sulfate ,Fibroblast growth factors, FGFR1, Homodimerization, BRET, MAPK ,Cell biology ,Fibroblast Growth Factors ,stomatognathic diseases ,HEK293 Cells ,chemistry ,Settore BIO/14 - Farmacologia ,Phosphorylation ,Heparitin Sulfate ,Protein Multimerization - Abstract
Fibroblast growth factor receptor 1 (FGFR1) is known to be activated by homodimerization in the presence of both the FGF agonist ligand and heparan sulfate glycosaminoglycan. FGFR1 homodimers in turn trigger a variety of downstream signaling cascades via autophosphorylation of tyrosine residues in the cytoplasmic domain of FGFR1. By means of Bioluminescence Energy Resonance Transfer (BRET) as a sign of FGFR1 homodimerization, we evaluated in HEK293T cells the effects of all known FGF agonist ligands on homodimer formation. A significant correlation between BRET(2) signaling and ERK1/2 phosphorylation was observed, leading to a further characterization of the binding and signaling properties of the FGF subfamilies. FGF agonist ligand-FGFR1 binding interactions appear as the main mechanism for the control of FGFR1 homodimerization and MAPK signaling which demonstrated a high correlation. The bioinformatic analysis demonstrates the interface of the two pro-triplets SSS (Ser-Ser-Ser) and YGS (Tyr-Gly-Ser) located in the extracellular and intracellular domain of the FGFR1. These pro-triplets are postulated participate in the FGFR1 homodimerization interface interaction. The findings also reveal that FGF agonist ligands within the same subfamily of the FGF gene family produced similar increases in FGFR1 homodimer formation and MAPK signaling. Thus, the evolutionary relationship within this gene family appears to have a distinct functional relevance.
- Published
- 2011