Identification of neural cell adhesion molecule L1-derived neuritogenic ligands of the fibroblast growth factor receptor.
The neural cell adhesion molecule L1 plays an important role in axon growth, neuronal survival, and synaptic plasticity. We recently demonstrated that the L1 fibronectin type III (FN3) modules interact directly with the fibroblast growth factor (FGF) receptor (FGFR). Sequence alignment of individual L1 FN3 modules with various FGFs suggested that four sequence motifs located in the third and fifth L1 FN3 modules might be involved in interactions with FGFR. The present study found that corresponding synthetic peptides, termed elcamins 1, 2, 3, and 4, bind and activate FGFR in the absence of FGF1. Conversely, in the presence of FGF1, elcamins inhibited receptor phosphorylation, indicating that the peptides are FGFR partial agonists. Elcamins 1, 3, and 4 dose dependently induced neurite outgrowth in cultured primary cerebellar neurons. The neuritogenic effect of elcamins was dependent on FGFR activation, insofar as the effect was abolished by the receptor inhibition. Thus, the identified peptides act as L1 mimetics with regard to activation of FGFR and induction of neurite outgrowth.
Kulahin
Nikolaj
N
Protein Laboratory, Department of Neuroscience and Pharmacology, University of Copenhagen, Copenhagen, Denmark. niku@hagedorn.dk
Li
Shizhong
S
Kiselyov
Vladislav
V
Bock
Elisabeth
E
Berezin
Vladimir
V
D020816:Amino Acid Motifs / Q000502:physiology; D000595:Amino Acid Sequence / Q000502:physiology; D000818:Animals; D002454:Cell Differentiation / Q000502:physiology*; D002460:Cell Line; D002478:Cells, Cultured; D002490:Central Nervous System / Q000196:embryology* / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D008024:Ligands; D039842:Neural Cell Adhesion Molecule L1 / Q000819:agonists / Q000737:chemistry / Q000378:metabolism*; D016501:Neurites / Q000187:drug effects / Q000378:metabolism / Q000648:ultrastructure; D055495:Neurogenesis / Q000502:physiology*; D010455:Peptides / Q000378:metabolism / Q000494:pharmacology; D010766:Phosphorylation / Q000187:drug effects; D011485:Protein Binding / Q000502:physiology; D051381:Rats; D017468:Receptors, Fibroblast Growth Factor / Q000819:agonists / Q000378:metabolism*; D015854:Up-Regulation / Q000187:drug effects / Q000502:physiology
D008024:Ligands; D039842:Neural Cell Adhesion Molecule L1; D010455:Peptides; D017468:Receptors, Fibroblast Growth Factor; C542379:elcamin 1 peptide