PMID- 10571233 OWN - NLM STAT- MEDLINE DCOM- 19991206 LR - 20220410 IS - 0896-6273 (Print) IS - 0896-6273 (Linking) VI - 24 IP - 2 DP - 1999 Oct TI - Essential role for TrkB receptors in hippocampus-mediated learning. PG - 401-14 AB - Brain-derived neurotrophic factor (BDNF) and its receptor TrkB regulate both short-term synaptic functions and long-term potentiation (LTP) of brain synapses, raising the possibility that BDNF/TrkB may be involved in cognitive functions. We have generated conditionally gene targeted mice in which the knockout of the trkB gene is restricted to the forebrain and occurs only during postnatal development. Adult mutant mice show increasingly impaired learning behavior or inappropriate coping responses when facing complex and/or stressful learning paradigms but succeed in simple passive avoidance learning. Homozygous mutants show impaired LTP at CA1 hippocampal synapses. Interestingly, heterozygotes show a partial but substantial reduction of LTP but appear behaviorally normal. Thus, CA1 LTP may need to be reduced below a certain threshold before behavioral defects become apparent. FAU - Minichiello, L AU - Minichiello L AD - European Molecular Biology Laboratory, Heidelberg, Germany. FAU - Korte, M AU - Korte M FAU - Wolfer, D AU - Wolfer D FAU - Kuhn, R AU - Kuhn R FAU - Unsicker, K AU - Unsicker K FAU - Cestari, V AU - Cestari V FAU - Rossi-Arnaud, C AU - Rossi-Arnaud C FAU - Lipp, H P AU - Lipp HP FAU - Bonhoeffer, T AU - Bonhoeffer T FAU - Klein, R AU - Klein R LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Neuron JT - Neuron JID - 8809320 RN - 0 (Protein Isoforms) RN - 059QF0KO0R (Water) RN - EC 2.7.10.1 (Receptor, trkB) SB - IM MH - Animals MH - Animals, Newborn MH - Brain/anatomy & histology/cytology MH - Catalysis MH - Hippocampus/*physiology MH - Learning/*physiology MH - Long-Term Potentiation/physiology MH - Maze Learning/physiology MH - Mice MH - Mice, Knockout/genetics MH - Protein Isoforms/physiology MH - Receptor, trkB/genetics/*physiology MH - Reference Values MH - Response Elements/physiology MH - Synaptic Transmission/physiology MH - Water EDAT- 1999/11/26 00:00 MHDA- 1999/11/26 00:01 CRDT- 1999/11/26 00:00 PHST- 1999/11/26 00:00 [pubmed] PHST- 1999/11/26 00:01 [medline] PHST- 1999/11/26 00:00 [entrez] AID - S0896-6273(00)80853-3 [pii] AID - 10.1016/s0896-6273(00)80853-3 [doi] PST - ppublish SO - Neuron. 1999 Oct;24(2):401-14. doi: 10.1016/s0896-6273(00)80853-3.