Intracellular Ca2+ regulates spike encoding at cortical GABAergic neurons and cerebellar Purkinje cells differently.
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.
Department of Physiology, Bengbu Medical College, Bengbu Anhui 233000, China.
Yulong
Y
Qi
Li
L
Huang
Hong
H
Ni
Xin
X
Zhou
Jing
J
Zhang
Yan
Y
Zhu
Ming
M
Ge
Sudong
S
Guan
Jin-Hui
JH
Wang
D000200:Action Potentials; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D020013:Calcium Signaling; D002478:Cells, Cultured; D002540:Cerebral Cortex / Q000166:cytology / Q000378:metabolism / Q000502:physiology*; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D051379:Mice; D008815:Mice, Inbred Strains; D009474:Neurons / Q000378:metabolism / Q000502:physiology; D011689:Purkinje Cells / Q000378:metabolism / Q000502:physiology*; D005680:gamma-Aminobutyric Acid / Q000378:metabolism*
D049452:Green Fluorescent Proteins; D005680:gamma-Aminobutyric Acid; D002118:Calcium