Impaired learning in mice with abnormal short-lived plasticity

Current Biology : CB
A J SilvaR Bourtchuladze

Abstract

Many studies suggest that long term potentiation (LTP) has a role in learning and memory. In contrast, little is known about the function of short-lived plasticity (SLP). Modeling results suggested that SLP could be responsible for temporary memory storage, as in working memory, or that it may be involved in processing information regarding the timing of events. These models predict that abnormalities in SLP should lead to learning deficits. We tested this prediction in four lines of mutant mice with abnormal SLP, but apparently normal LTP-mice heterozygous for a alpha-calcium calmodulin kinase II mutation (alpha CaMKII +/-) have lower paired-pulse facilitation (PPF) and increased post-tetanic potentiation (PTP); mice lacking synapsin II (SyII-/-), and mice defective in both synapsin I and synapsin II (SyI/II-/-), show normal PPF but lower PTP; in contrast, mice just lacking synapsin I (SyI-/-) have increased PPF, but normal PTP. Our behavioral results demonstrate that alpha CaMKII +/-, SyII-/- and SyI/II-/- mutant mice, which have decreased PPF or PTP, have profound impairments in learning tasks. In contrast, behavioral analysis did not reveal learning deficits in SyI-/- mice, which have increased PPF. Our results are consiste...Continue Reading

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