Fibroblast growth factor receptor-1 is required for long-term potentiation, memory consolidation, and neurogenesis

Background: Although substantial evidence supports the view that adult neurogenesis is involved in learning and memory, how newly generated neurons contribute to the cognitive process remains unknown. Fibroblast growth factor 2 (FGF-2) is known to stimulate the proliferation of neuronal progenitor cells (NPCs) in adult brain. Using conditional knockout micethat lack brain expression of FGFR1, a major receptor for FGF-2, we have investigated the role of adult neurogenesis in hippocampal synaptic plasticity and learning and memory. Methods: The Fgfr1 conditional knockout mice were generated by crossing the Fgfr1-null line, the Fgfr1-flox line, and the Nestin-Cre transgenic mice. Bromodeoxyuricline (BrdU) labeling, slice electrophysiology, and Morris Water Maze experiments were performed with the Fgfrl conditional mutant mice. Results: Bromodeoxyuridine labeling experiments demonstrate that FGFR1 is required for the proliferation of NPCs as well as generation of new neurons in the adult clentate gyrus (DG). Moreover, deficits in neurogenesis in Fgfrl mutant mice are accompanied by a severe impairment of long-term potentiation (LTP) at the medial perforant path (MPP)-granule neuron synapses in the hippocampal clentate. Moreover, the Fgfr1 mutant mice exhibit significant deficits in memory consolidation but not spatial learning. Conclusions: Our study suggests a critical role of FGFR1 in adult neurogenesis in vivo, provides a potential link between proliferative neurogenesis and clentate LTP, and raises the possibility that adult neurogenesis might contribute to memory consolidation.