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Updated: Jul 15, 2026
Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions
Published on: October 21, 2017
MIF Inhibition by ISO-1 Decreased Autophagic Activity in Primary Astrocytes During Cobalt Chloride-Induced Hypoxia
Ji-Hyun Park1, Hye-Ji Cho2, Dae-Yong Song1
1Department of Anatomy and Neurosciences, School of Medicine, Eulji University, Daejeon 34824, Republic of Korea.
Abstract:
Ischemic stroke is a leading contributor to death and disability worldwide, driving extensive research into pharmacological treatments beyond thrombolysis. Macrophage migration inhibitory factor (MIF), a cytokine, is implicated in several pathological conditions. In this study, we examined the effects of MIF on autophagy in astrocytes under the condition of chemical hypoxia. Primary astrocytes were treated with cobalt chloride, a well-known drug for inducing chemical hypoxia, followed by Western blot analyses to assess the HIF-1α, MIF, and LC3 protein levels along with a CCK assay. Additionally, cobalt chloride-treated astrocytes were co-treated with the MIF inhibitor ISO-1, and Western blot analyses were performed for MIF and LC3. Cell viability was evaluated using the CCK assay in astrocytes treated with cobalt chloride and ISO-1, with additional rapamycin treatment. Our results show that ISO-1 reduced LC3-II levels in astrocytes exposed to high concentrations of cobalt chloride (1000 μM) for 6 h. Moreover, rapamycin decreased cell viability in astrocytes treated with both 1000 μM cobalt chloride and ISO-1. Our data suggest that MIF plays a role in inducing autophagy in astrocytes under hypoxic conditions and is involved in the regulation of autophagic activity.
Insights
Macrophage migration inhibitory factor (MIF) influences astrocyte autophagy during chemical hypoxia. Inhibiting MIF reduces autophagic activity, suggesting its role in hypoxic astrocyte responses.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Ischemic stroke is a major cause of global mortality and disability.
- Research is exploring pharmacological treatments beyond thrombolysis for ischemic stroke.
- Macrophage migration inhibitory factor (MIF) is a cytokine implicated in various pathological conditions.
Purpose of the Study:
- To investigate the role of MIF in regulating astrocyte autophagy under chemical hypoxia.
- To determine the impact of MIF inhibition on autophagic markers in hypoxic astrocytes.
Main Methods:
- Primary astrocytes were subjected to chemical hypoxia using cobalt chloride.
- Western blot analysis was used to measure protein levels of HIF-1α, MIF, and LC3.
- Cell viability was assessed using CCK assays.
- MIF inhibition was achieved using the specific inhibitor ISO-1.
Main Results:
- Cobalt chloride induced chemical hypoxia in astrocytes.
- MIF inhibition with ISO-1 decreased LC3-II levels under high-concentration cobalt chloride exposure.
- Rapamycin treatment reduced cell viability in astrocytes exposed to both cobalt chloride and ISO-1.
Conclusions:
- MIF appears to play a role in inducing astrocyte autophagy under hypoxic conditions.
- MIF is involved in the regulation of autophagic activity in astrocytes during hypoxia.
- Targeting MIF may offer a therapeutic strategy for conditions involving hypoxic astrocytes.
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