Na+/Ca2+ exchanger 1 alters in pyramidal cells and expresses in astrocytes of the gerbil hippocampal CA1 region after ischemia

In Koo Hwang, Ki Yeon Yoo, Dae Won Kim, Tae Cheon Kang, Soo Young Choi, Young Guen Kwon, Byoung Hee Han, Jong Sung Kim, Moo Ho Won

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Abstract

Alterations of immunoreactivity and protein contents of Na+/Ca2+ exchanger 1 (NCX1) were observed in the gerbil hippocampus proper after 5 min of transient forebrain ischemia. NCX1 immunoreactivity was significantly changed in the hippocampal CA1 region, but not in the CA2/3 region after ischemia/reperfusion. In the sham-operated group, NCX1 immunoreactivity was mainly detected in CA1 pyramidal cells. However, 30 min after ischemia/reperfusion, NCX1 immunoreactivity was significantly decreased and then increased at 1 day after ischemia. At this time, NCX1 immunoreactivity in CA1 pyramidal cells was similar to that of the sham-operated group. At 3 days after ischemia, NCX1 immunoreactivity was significantly reduced in the CA1 region compared to that of the sham-operated group and NCX1 immunoreactivity was significantly increased again 4 days after ischemia. Thereafter, NCX1 immunoreactivity was decreased time-dependently in ischemia groups. Between 15 min and 6 h post-ischemia, NCX1 immunoreactivity was expressed in astrocytes in the strata oriens and radiatum of the CA1 region. From 3 days post-ischemia, NCX1 immunoreactivity was expressed in astrocytes in the strata oriens and radiatum. Ischemia-induced changes in NCX1 protein contents in the hippocampus proper concurred with immunohistochemical data post-ischemia. Our results suggest that changes in NCX1 in CA1 pyramidal cells and astrocytes after ischemia are associated with intracellular Na+ concentrations and that NCX1 may induce an intracellular calcium overload, which may be related to neuronal death.

Original languageEnglish
Pages (from-to)181-190
Number of pages10
JournalBrain Research
Volume1086
Issue number1
DOIs
Publication statusPublished - 2006 May 1

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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    Koo Hwang, I., Yoo, K. Y., Won Kim, D., Kang, T. C., Young Choi, S., Kwon, Y. G., Hee Han, B., Sung Kim, J., & Won, M. H. (2006). Na+/Ca2+ exchanger 1 alters in pyramidal cells and expresses in astrocytes of the gerbil hippocampal CA1 region after ischemia. Brain Research, 1086(1), 181-190. https://doi.org/10.1016/j.brainres.2006.02.048