Hypoxic-Ischemic Brain Damage in 7-Days-Old Rats: Early Neuronal Changes and the Long-Term Outcome

Authors

  • Arturo Ota Nakasone Departamento de Ginecología y Obstetricia Escuela de Medicina de Miyazaki Miyazaki, Japón
  • Tomoaki Ikeda Departamento de Ginecología y Obstetricia Escuela de Medicina de Miyazaki Miyazaki, Japón
  • Hiroshi Sameshima Departamento de Ginecología y Obstetricia Escuela de Medicina de Miyazaki Miyazaki, Japóni
  • Tsuyomu Ikenoue Departamento de Ginecología y Obstetricia Escuela de Medicina de Miyazaki Miyazaki, Japón
  • Kiyotaka Toshimori Departamento de Anatomía Escuela de Medicina de Miyazaki Miyazaki, Japón

DOI:

https://doi.org/10.15381/anales.v60i4.4378

Keywords:

Brain Damage, Chronic, Cerebral Anoxia, Cerebral Ischemia, Immunohistochemistry

Abstract

OBJECTIVES: To study the changes after hypoxia-ischemia (HI), and to observe both, the vulnerability of the different regions of the brain to HI and the heat shock protein-72 kDa (HSP72) induction and its efects on the neuronal cell. MATERIAL AND METHODS: 7-days-old rats were exposed to left carotid artery ligation followed by 2 h of HI and then they were sacrificed at different time points. Brains extracted at 1-72 h were immunohistochemically study using the HSP-72 and the microtubule associated protein-2 (MAP2) stainings. Brains extracted at 1-4 weeks underwent histopathological study. RESULTS: Loss of MAP2 immunostaining was detected since the 1st hour post-insult, being highest at 24 h. MAP2 reappeared at 72 h in almost all the brain regions of the ligated hemisphere, except the hippocampal CA3 region. At 1-2 weeks post HI, we observed atrophic and cystic lesions. 15-20% of rats did not show any anatomical lesion up to 4 weeks post HI. The HSP72 synthesis was early in the dentate gyrus of the hippocampus, but a delayed induction was observed in the CA3 region; this region showed an increased vulnerability to HI. CONCLUSIONS: Absence of anatomical lesion was observed in 15-20% of rats exposed to HI. Atrophic or cystic lesions are observed since 1-2 weeks after the insult, despite an apparent immunohistochemical recovery at 72 h.

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Published

1999-12-31

Issue

Vol. 60 No. 4 (1999)

Section

Trabajos originales

License

Copyright (c) 1999 Arturo Ota Nakasone, Tomoaki Ikeda, Hiroshi Sameshima, Tsuyomu Ikenoue, Kiyotaka Toshimori

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How to Cite

1.
Ota Nakasone A, Ikeda T, Sameshima H, Ikenoue T, Toshimori K. Hypoxic-Ischemic Brain Damage in 7-Days-Old Rats: Early Neuronal Changes and the Long-Term Outcome. An Fac med [Internet]. 1999 Dec. 31 [cited 2024 Jul. 17];60(4):235-43. Available from: https://revistasinvestigacion.unmsm.edu.pe/index.php/anales/article/view/4378