期刊
NEUROBIOLOGY OF DISEASE
卷 21, 期 1, 页码 217-227出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.nbd.2005.07.005
关键词
LTP; LTD; mental retardation
资金
- NIMH NIH HHS [MH59800] Funding Source: Medline
- NATIONAL INSTITUTE OF MENTAL HEALTH [R01MH059800] Funding Source: NIH RePORTER
Rett syndrome is an X-linked neurodevelopmental disorder caused by mutations in the gene encoding the transcriptional repressor methyl-CpG-binding protein 2 (MeCP2). Here we demonstrate that the Meep2-null mouse model of Rett syndrome shows an age-dependent impairment in hippocampal CA1 long-term potentiation induced by tetanic or theta-burst stimulation. Long-term depression induced by repetitive low-frequency stimulation is also absent in behaviorally symptomatic Mecp2-null mice. Immunoblot analyses from behaviorally symptomatic Meep2-null mice reveal altered expression of N-methyl-D-aspartate receptor subunits NR2A and NR2B. Presynaptic function is also affected, as demonstrated by a significant reduction in paired-pulse facilitation. Interestingly, the properties of basal neurotransmission are normal in the Meep2-null mice, consistent with our observations that the levels of expression of synaptic and cytoskeletal proteins, including glutamate receptor subunits GluR1 and GluR2, PSD95, synaptophysin-1, synaptobrevin-2, synaptotagmin-1, MAP2, beta III-tubulin and NF200, are not significantly altered. Together, these data provide the first evidence that the loss of Meep2 expression is accompanied by age-dependent alterations in excitatory synaptic plasticity that are likely to contribute to the cognitive and functional deficits underlying Rett syndrome. (c) 2005 Elsevier Inc. All rights reserved.
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