Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 381, Issue 1, Pages 129-133Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2009.02.058
Keywords
Cerebral cortex; Cerebellum; Purkinje cells; GABAergic neuron; Calcineurin; CaM-KII; Action potential
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Funding
- National Award for Outstanding Young Scientist [30325021]
- National Basic Research Program [2006CB500804]
- Natural Science Foundation China [30621130077, 30870517]
- CAS Program for Knowledge Innovation [KSCX2YWR-39]
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Spike encoding at GABAergic neurons plays an important role in maintaining the homeostasis of brain functions for well-organized behaviors. The rise of intracellular Ca2+ in GABAergic neurons causes synaptic plasticity. It is not clear how intracellular Ca2+ influences their spike encoding. We have investigated this issue at GFP-labeled GABAergic cortical neurons and cerebellar Purkinje cells by whole-cell recording in mouse brain slices. Our results show that an elevation of intracellular Ca2+ by infusing adenophostin-A lowers spike encoding at GABAergic cortical neurons and enhances encoding ability at cerebellar Purkinje cells. These differential effects of cytoplasmic Ca2+ on spike encoding are mechanistically associated with Ca2+-induced changes in the refractory periods and threshold potentials of sequential spikes, as well as with various expression ratios of CaM-KII to calcineurin in GABAergic cortical neurons and cerebellar Purkinje cells. (C) 2009 Elsevier Inc. All rights reserved.
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