Related Experiment Videos
[Delayed apoptosis and its regulation in astrocytes]
1Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Kobe Gakuin University, 518 Arise, Ikawadani-cho, Nishi-ku, Kobe 651-2180, Japan.
Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
|September 18, 2001
Summary
Reperfusion after calcium depletion causes astrocyte death via calcium overload, a process modeled in vitro. Several drugs show protective effects against this calcium paradox injury, offering potential therapeutic strategies for brain ischemia.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Context:
- Astrocytes are crucial glial cells in the brain with roles in both normal function and disease.
- Ischemia/reperfusion injury in the brain involves complex cellular mechanisms.
- Calcium (Ca2+) dysregulation is a key factor in neuronal and glial cell damage during injury.
Purpose:
- To investigate the mechanisms of Ca2+-mediated delayed cell death in astrocytes following reperfusion.
- To explore the role of the Na(+)-Ca2+ exchanger in Ca2+ paradox injury.
- To review the protective effects of pharmacological agents against Ca2+ reperfusion injury in astrocytes.
Summary:
- Reperfusion of cultured astrocytes after Ca2+ depletion leads to Ca2+ overload and delayed cell death, termed Ca2+ paradox injury, mediated by the Na(+)-Ca2+ exchanger.
- This injury model involves apoptosis, with key players including calpain, reactive oxygen species, calcineurin, caspase-3, and NF-kappa B.
- Drugs like CV-2619, T-588, and ibudilast demonstrate protective effects by modulating specific signaling pathways (NGF/MAPK/PI3K, MAPK, and cGMP, respectively).
Impact:
- Establishes an in vitro model for studying ischemia/reperfusion injury in astrocytes.
- Identifies molecular pathways involved in Ca2+ paradox injury and astrocyte apoptosis.
- Highlights potential therapeutic targets and drug candidates for mitigating brain ischemia/reperfusion damage through astrocyte modulation.