TY - JOUR
T1 - Agonists of fibroblast growth factor receptor induce neurite outgrowth and survival of cerebellar granule neurons
AU - Li, Shizhong
AU - Christensen, Claus
AU - Køhler, Lene B
AU - Kiselyov, Vladislav V
AU - Berezin, Vladimir
AU - Bock, Elisabeth
N1 - Keywords: Analysis of Variance; Animals; Binding Sites; Cell Survival; Cells, Cultured; Cerebellum; Fibroblast Growth Factors; Image Processing, Computer-Assisted; Immunohistochemistry; Neural Cell Adhesion Molecules; Neurogenesis; Neurons; Phytic Acid; Pyrroles; Rats; Rats, Wistar; Receptors, Fibroblast Growth Factor; Video Recording
PY - 2009
Y1 - 2009
N2 - Fibroblast growth factor receptor (FGFR) signaling is pivotal in the regulation of neurogenesis, neuronal differentiation and survival, and synaptic plasticity both during development and in adulthood. In order to develop low molecular weight agonists of FGFR, seven peptides, termed hexafins, corresponding to the beta6-beta7 loop region of the FGF 1, 2, 3, 8, 9, 10, and 17, were synthesized. This region shares a homologous amino acid sequence with the FG-loop region of the second fibronectin Type III module of the neural cell adhesion molecule (NCAM) that binds to the FGFR. Hexafins were shown by surface plasmon resonance to bind to FGFR1-IIIc-Ig2-3 and FGFR2-IIIb-Ig2-3. The heparin analog sucrose octasulfate inhibited hexafin binding to FGFR1-IIIc-Ig2-3 indicating overlapping binding sites. Hexafin-binding to FGFR1-IIIc resulted in receptor phosphorylation, but inhibited FGF1-induced FGFR1 phosphorylation, indicating that hexafins act as partial agonists. Hexafin2, 3, 8, 10, and 17 (but not 1 or 9) induced neurite outgrowth from cerebellar granule neurons (CGNs), an effect that was abolished by two inhibitors of FGFR, SU5402 and inositol hexaphosphate (IP6) and a diacylglycerol lipase inhibitor, RHC-80267. The neuritogenic effects of selected hexafins could also be inhibited by FGF1 which by itself did not induce neurite outgrowth. Moreover, hexafin1, 3, 9, 10, and 17 (but not 2 or 8) promoted survival of CGNs induced to undergo apoptosis. Thus, selected hexafins induced neuronal differentiation and survival, making them promising pharmacological tools for the study of functional FGFR regulation in development of the nervous system.
AB - Fibroblast growth factor receptor (FGFR) signaling is pivotal in the regulation of neurogenesis, neuronal differentiation and survival, and synaptic plasticity both during development and in adulthood. In order to develop low molecular weight agonists of FGFR, seven peptides, termed hexafins, corresponding to the beta6-beta7 loop region of the FGF 1, 2, 3, 8, 9, 10, and 17, were synthesized. This region shares a homologous amino acid sequence with the FG-loop region of the second fibronectin Type III module of the neural cell adhesion molecule (NCAM) that binds to the FGFR. Hexafins were shown by surface plasmon resonance to bind to FGFR1-IIIc-Ig2-3 and FGFR2-IIIb-Ig2-3. The heparin analog sucrose octasulfate inhibited hexafin binding to FGFR1-IIIc-Ig2-3 indicating overlapping binding sites. Hexafin-binding to FGFR1-IIIc resulted in receptor phosphorylation, but inhibited FGF1-induced FGFR1 phosphorylation, indicating that hexafins act as partial agonists. Hexafin2, 3, 8, 10, and 17 (but not 1 or 9) induced neurite outgrowth from cerebellar granule neurons (CGNs), an effect that was abolished by two inhibitors of FGFR, SU5402 and inositol hexaphosphate (IP6) and a diacylglycerol lipase inhibitor, RHC-80267. The neuritogenic effects of selected hexafins could also be inhibited by FGF1 which by itself did not induce neurite outgrowth. Moreover, hexafin1, 3, 9, 10, and 17 (but not 2 or 8) promoted survival of CGNs induced to undergo apoptosis. Thus, selected hexafins induced neuronal differentiation and survival, making them promising pharmacological tools for the study of functional FGFR regulation in development of the nervous system.
U2 - 10.1002/dneu.20740
DO - 10.1002/dneu.20740
M3 - Journal article
C2 - 19634127
SN - 1932-8451
VL - 69
SP - 837
EP - 854
JO - Developmental Neurobiology
JF - Developmental Neurobiology
IS - 13
ER -