Increased inter-spike intervals and fast after-hyperpolarization of action potentials in rat hippocampal pyramidal cells accompanied with altered calbindin immunoreactivity 10-12 months after global forebrain ischemia

Dimitrula Arabadzisz, Aarne Ylinen, Z. Emri

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9 Citations (Scopus)

Abstract

In vivo electrophysiological recordings of CA1/CA2 pyramidal cells were performed 10-12 months after global forebrain ischemia (four-vessel occlusion, 15 mm) and were compared to levels of calbindin expression. Ischemic animals were subdivided in non-sclerotic ischemic (NSI) and sclerotic ischemic (SI) groups depending on the absence or presence of hippocampal sclerosis. A decreased excitability was observed in neurons from both groups, as shown by significant prolongation of inter-spike intervals (ISI) of evoked action potentials and by increased amplitude of fast after-hyperpolarization (fAHP). The ratio of calbindin-positive CA1/CA2 pyramidal cells decreased from 59% in control to 33% and 8% in NSI and SI animals, respectively. These results suggest that decreased excitability of CA1/CA2 pyramidal cells represents a protective mechanism against ischemia-induced neurodegeneration and might be related to decreased calbindin expression.

Original languageEnglish
Pages (from-to)103-106
Number of pages4
JournalNeuroscience Letters
Volume331
Issue number2
DOIs
Publication statusPublished - Oct 11 2002

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Calbindins
Pyramidal Cells
Prosencephalon
Action Potentials
Ischemia
Sclerosis
Evoked Potentials
Neurons

Keywords

  • Calbindin
  • Four-vessel occlusion
  • In vivo electrophysiology
  • Inter-spike interval
  • Principal cell

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

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title = "Increased inter-spike intervals and fast after-hyperpolarization of action potentials in rat hippocampal pyramidal cells accompanied with altered calbindin immunoreactivity 10-12 months after global forebrain ischemia",
abstract = "In vivo electrophysiological recordings of CA1/CA2 pyramidal cells were performed 10-12 months after global forebrain ischemia (four-vessel occlusion, 15 mm) and were compared to levels of calbindin expression. Ischemic animals were subdivided in non-sclerotic ischemic (NSI) and sclerotic ischemic (SI) groups depending on the absence or presence of hippocampal sclerosis. A decreased excitability was observed in neurons from both groups, as shown by significant prolongation of inter-spike intervals (ISI) of evoked action potentials and by increased amplitude of fast after-hyperpolarization (fAHP). The ratio of calbindin-positive CA1/CA2 pyramidal cells decreased from 59{\%} in control to 33{\%} and 8{\%} in NSI and SI animals, respectively. These results suggest that decreased excitability of CA1/CA2 pyramidal cells represents a protective mechanism against ischemia-induced neurodegeneration and might be related to decreased calbindin expression.",
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author = "Dimitrula Arabadzisz and Aarne Ylinen and Z. Emri",
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AU - Arabadzisz, Dimitrula

AU - Ylinen, Aarne

AU - Emri, Z.

PY - 2002/10/11

Y1 - 2002/10/11

N2 - In vivo electrophysiological recordings of CA1/CA2 pyramidal cells were performed 10-12 months after global forebrain ischemia (four-vessel occlusion, 15 mm) and were compared to levels of calbindin expression. Ischemic animals were subdivided in non-sclerotic ischemic (NSI) and sclerotic ischemic (SI) groups depending on the absence or presence of hippocampal sclerosis. A decreased excitability was observed in neurons from both groups, as shown by significant prolongation of inter-spike intervals (ISI) of evoked action potentials and by increased amplitude of fast after-hyperpolarization (fAHP). The ratio of calbindin-positive CA1/CA2 pyramidal cells decreased from 59% in control to 33% and 8% in NSI and SI animals, respectively. These results suggest that decreased excitability of CA1/CA2 pyramidal cells represents a protective mechanism against ischemia-induced neurodegeneration and might be related to decreased calbindin expression.

AB - In vivo electrophysiological recordings of CA1/CA2 pyramidal cells were performed 10-12 months after global forebrain ischemia (four-vessel occlusion, 15 mm) and were compared to levels of calbindin expression. Ischemic animals were subdivided in non-sclerotic ischemic (NSI) and sclerotic ischemic (SI) groups depending on the absence or presence of hippocampal sclerosis. A decreased excitability was observed in neurons from both groups, as shown by significant prolongation of inter-spike intervals (ISI) of evoked action potentials and by increased amplitude of fast after-hyperpolarization (fAHP). The ratio of calbindin-positive CA1/CA2 pyramidal cells decreased from 59% in control to 33% and 8% in NSI and SI animals, respectively. These results suggest that decreased excitability of CA1/CA2 pyramidal cells represents a protective mechanism against ischemia-induced neurodegeneration and might be related to decreased calbindin expression.

KW - Calbindin

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KW - Inter-spike interval

KW - Principal cell

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