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2-Vessel Occlusion/Hypotension: A Rat Model of Global Brain Ischemia
Published on: June 22, 2013
Ionized calcium-binding adapter molecule 1 immunoreactive cells change in the gerbil hippocampal CA1 region after
In Koo Hwang1, Ki-Yeon Yoo, Dae Won Kim
1Department of Anatomy, College of Medicine, Hallym University, Chunchon 200-702, South Korea.
Insights
Ionized calcium-binding adapter molecule 1 (iba-1) expression in microglia changes over time following transient ischemia in gerbils. These iba-1 changes correlate with delayed neuronal death in the hippocampus.
Area of Science:
- Neuroscience
- Cell Biology
- Ischemia Research
Background:
- Ionized calcium-binding adapter molecule 1 (iba-1) is a specific marker for microglia.
- Microglia play a crucial role in regulating brain function.
- Understanding microglial response to ischemia is vital for neuroprotection.
Purpose of the Study:
- To investigate the temporal expression patterns of iba-1 in microglia after transient forebrain ischemia in gerbils.
- To correlate iba-1 changes with morphological alterations of microglia and neuronal damage.
Main Methods:
- Transient forebrain ischemia induced in gerbils by bilateral common carotid artery occlusion.
- Immunohistochemical and Western blot analyses to detect iba-1 expression and level.
- Co-localization studies with OX-42, a microglia marker.
Main Results:
- Iba-1 immunoreactivity significantly increased 30 minutes post-ischemia, with well-ramified cells.
- Iba-1 levels fluctuated, peaking at 7 days and decreasing by 10 days post-ischemia.
- Iba-1 positive cells showed co-localization with OX-42, confirming microglial identity.
Conclusions:
- Temporal changes in iba-1 expression and microglial morphology occur after transient ischemia.
- These dynamic microglial responses in the CA1 region may be linked to delayed neuronal death.
Abstract:
Ionized calcium-binding adapter molecule 1 (iba-1) is specifically expressed in microglia and plays an important role in the regulation of the function of microglia. We observed chronological changes of iba-1-immunoreactive cells and iba-1 level in the gerbil hippocampal CA1 region after transient ischemia. Transient forebrain ischemia in gerbils was induced by the occlusion of bilateral common carotid arteries for 5 min. Immunohistochemical and Western blot analysis of iba-1 were performed in the gerbil ischemic hippocampus. In the sham-operated group, iba-1-immunoreactive cells were detected in the CA1 region. Thirty minutes after ischemia/reperfusion, iba-1 immunoreactivity significantly increased, and its immunoreactive cells were well ramified. Three hours after ischemia/reperfusion, iba-1 immunoreactivity and level decreased, and thereafter they increased again with time after ischemia/reperfusion. Three days after ischemia/reperfusion, iba-1-immunoreactive cells had well-ramified processes, which projected to the stratum pyramidale of the CA1 region. Seven days after ischemia/reperfusion, iba-1 immunoreactivity and level were highest in the CA1 region, whereas they significantly decreased in the CA1 region 10 days after ischemia/reperfusion. Iba-1-immunoreactive cells in the ischemic CA1 region were co-localized with OX-42, a microglia marker. In brief, iba-1-immunoreactive cells change morphologically and iba-1 immunoreactivity alters in the CA1 region with time after ischemia/reperfusion. These may be associated with the delayed neuronal death of CA1 pyramidal cells in the gerbil ischemic hippocampus.
