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Updated: Jun 2, 2026
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Hypothermic and normothermic ischemia-reperfusion activate microglia differently in hippocampal formation
Anzu Yamashita1, Teruhito Kunimatsu, Kentaro Yamada
1Research Center of Brain and Oral Science, Kanagawa Dental College, Japan.
Insights
Hypothermia alters microglial morphology and increases their area in the hippocampus during ischemia-reperfusion. These changes suggest microglia contribute to the neuroprotective effects of hypothermic ischemia.
Area of Science:
- Neuroscience
- Immunology
Background:
- Ischemia-reperfusion injury affects the brain.
- Microglia play a role in brain injury and repair.
Purpose of the Study:
- To investigate microglial morphology and distribution under normothermic and hypothermic ischemia.
- To understand the role of microglia in the neuroprotective effects of hypothermia.
Main Methods:
- Immunohistochemistry using an anti-ionized calcium-binding adapter molecule 1 (Iba-1) antibody.
- Comparison of microglial profiles in the hippocampal CA1 sector and dentate gyrus between normothermic and hypothermic ischemia models.
Main Results:
- Under normothermic ischemia, microglia showed swollen somata with short, thick processes.
- Under hypothermic ischemia, microglia exhibited fine, long-branched processes.
- Increased microglial area was observed in the hippocampus (CA1 and dentate gyrus) under hypothermic ischemia compared to normothermic ischemia.
Conclusions:
- Hypothermia significantly alters microglial morphology and increases their area during ischemia-reperfusion.
- These microglial changes under hypothermia may contribute to a neuroprotective environment.
- Further research is warranted to elucidate the precise mechanisms of hypothermia-induced neuroprotection involving microglia.
Abstract:
Using immunohistochemical methods, we investigated microglial profiles under normothermic ischemia and hypothermic ischemia using an anti-ionized calcium-binding adapter molecule 1 (Iba-1) antibody. In the early stages of ischemia-reperfusion, Iba-1-immunoreactive microglial cells under normothermic ischemia were characterized by swollen somata with short and thick processes, while fine long-branched processes in greater numbers were seen emanating from microglial somata under hypothermic ischemia. In animals subjected to hypothermic ischemia, immunoreactive microglial areas in the hippocampal CA1 sector were significantly increased after 5 and 8 h of reperfusion when compared with those under normothermic ischemia. In the dentate gyrus, an increase in the microglial area under hypothermic ischemia was already evident at 2 h after reperfusion; this increased level was maintained up to 8 h. Considering the various neuroprotective roles of hypothermic ischemia, the characteristic features of microglia under hypothermic ischemia may be associated with the formation of a neuroprotective environment.
