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The Journal of Neuroscience, November 1, 1999, 19(21):9346-9354
Loss of Synaptic Depression in Mammalian Anterior Cingulate Cortex after Amputation
Feng Wei, Ping Li, and Min Zhuo Departments of Anesthesiology, and Anatomy and Neurobiology, Washington University Medical Center, Washington University School of Medicine, St. Louis, Missouri 63110
Two forms of activity-dependent long-term depression (LTD) in the CNS, as defined by their sensitivity to the blockade of NMDA receptors, are thought to be important in learning, memory, and development. Here, we report that NMDA receptor-independent LTD is the major form of long-term plasticity in the anterior cingulate cortex (ACC). Both L-type voltage-gated calcium channels and metabotropic glutamate receptors are required for inducing LTD. Amputation of a third hindpaw digit in an adult rat induced rapid expression of immediate early genes in the ACC bilaterally and caused a loss of LTD that persisted for at least 2 weeks. Our results suggest that synaptic LTD in the ACC may contribute to enhanced neuronal responses to subsequent somatosensory stimuli after amputation.
Key words: synaptic plasticity; long-term depression; immediate-early gene; cingulate cortex; amputation; glutamate
Copyright © 1999 Society for Neuroscience 0270-6474/99/19219346-09$05.00/0
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