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Hyperthermia accelerates neuronal loss differently between the hippocampal CA1 and CA2/3 through different HIF‑1α expression after transient ischemia in gerbils

  • Authors:
    • Tae-Kyeong Lee
    • Dae Won Kim
    • Hyejin Sim
    • Jae-Chul Lee
    • Hyung Il Kim
    • Myoung Cheol Shin
    • Jun Hwi Cho
    • Joon Ha Park
    • Choong-Hyun Lee
    • Moo-Ho Won
    • Ji Hyeon Ahn

  • View Affiliations

  • Published online on: February 28, 2022     https://doi.org/10.3892/ijmm.2022.5111
  • Article Number: 55

  • Copyright: © Lee et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The hippocampus has a different vulnerability to ischemia according to the subfields CA1 to CA3 (initials of cornu ammonis). It has been reported that body temperature changes during ischemia affect the degree of neuronal death following transient ischemia. Hypoxia‑inducible factor 1α (HIF‑1α) plays a key role in regulating cellular adaptation to low oxygen conditions. In the present study, we investigated the pattern of neuronal death (loss) in CA1 and CA2/3 following 5 min transient forebrain ischemia (TFI) under hyperthermia (39.5±0.2˚C) and the relationship between neuronal death and changes in HIF‑1α expression using western blot analysis and immunohistochemistry in gerbils. Normothermia or hyperthermia was induced for 30 min before and during the TFI, and neuronal death and HIF‑1α expression were observed at 0, 3, 6 and 12 h, 1, 2 and 5 days after TFI. Under normothermia, TFI‑induced neuronal death of CA1 pyramidal neurons occurred on day 5 after TFI, but CA2/3 pyramidal neurons did not die. In contrast, under hyperthermia, the death of CA1 and CA2/3 pyramidal neurons was observed on day 2 after TFI. Under normothermia, HIF‑1α expression was significantly elevated in both CA1 and CA2/3 pyramidal neurons at 12 h and 1 day after TFI, and the increased HIF‑1α immunoreactivity in CA1 was dramatically reduced from 2 days after TFI, but not in CA2/3 pyramidal neurons. Under hyperthermia, the basal expression of HIF‑1α in the sham group was significantly higher in both CA1 and CA2/3 pyramidal neurons at 0 h after TFI than in the normothermia group. HIF‑1 expression was continuously higher, peaked at 12 h after TFI, and then significantly decreased from 1 day after TFI. Overall, the present results indicate that resistance to ischemia in CA2/3 pyramidal neurons is closely associated with the persistence of increased expression of HIF‑1α after ischemic insults and that hyperthermia‑induced exacerbation of death of pyramidal neurons is closely related to decreased HIF‑1α expression after ischemic insults.
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April-2022
Volume 49 Issue 4

Print ISSN: 1107-3756
Online ISSN:1791-244X

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Spandidos Publications style
Lee T, Kim DW, Sim H, Lee J, Kim HI, Shin MC, Cho JH, Park JH, Lee C, Won M, Won M, et al: Hyperthermia accelerates neuronal loss differently between the hippocampal CA1 and CA2/3 through different HIF‑1α expression after transient ischemia in gerbils. Int J Mol Med 49: 55, 2022.
APA
Lee, T., Kim, D.W., Sim, H., Lee, J., Kim, H.I., Shin, M.C. ... Ahn, J.H. (2022). Hyperthermia accelerates neuronal loss differently between the hippocampal CA1 and CA2/3 through different HIF‑1α expression after transient ischemia in gerbils. International Journal of Molecular Medicine, 49, 55. https://doi.org/10.3892/ijmm.2022.5111
MLA
Lee, T., Kim, D. W., Sim, H., Lee, J., Kim, H. I., Shin, M. C., Cho, J. H., Park, J. H., Lee, C., Won, M., Ahn, J. H."Hyperthermia accelerates neuronal loss differently between the hippocampal CA1 and CA2/3 through different HIF‑1α expression after transient ischemia in gerbils". International Journal of Molecular Medicine 49.4 (2022): 55.
Chicago
Lee, T., Kim, D. W., Sim, H., Lee, J., Kim, H. I., Shin, M. C., Cho, J. H., Park, J. H., Lee, C., Won, M., Ahn, J. H."Hyperthermia accelerates neuronal loss differently between the hippocampal CA1 and CA2/3 through different HIF‑1α expression after transient ischemia in gerbils". International Journal of Molecular Medicine 49, no. 4 (2022): 55. https://doi.org/10.3892/ijmm.2022.5111