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Cyclic AMP-elevating agents prevent oligodendroglial excitotoxicity

A Yoshioka¹, Y Shimizu, G Hirose

¹Department of Neurology, Kanazawa Medical University, Uchinada, Ishikawa, Japan.

Journal of Neurochemistry

|May 29, 1998

Summary

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Agents that increase cyclic AMP levels protect oligodendroglial cells from excitotoxicity. This protection involves reducing calcium influx through non-NMDA glutamate receptors, mediated by protein phosphorylation.

Area of Science:

Neuroscience
Cell Biology
Neuropharmacology

Background:

Oligodendroglial cells are vulnerable to excitotoxicity mediated by non-NMDA glutamate receptors.
Kainate-induced calcium influx damages these cells, impacting central nervous system function.

Purpose of the Study:

To investigate whether agents elevating intracellular cyclic AMP can prevent oligodendroglial excitotoxicity.
To elucidate the mechanisms underlying the protective effects of cyclic AMP.

Main Methods:

Utilized CG-4 cell line for oligodendrocyte-like cells.
Exposed cells to kainate and measured cell death via lactate dehydrogenase release.
Assessed the impact of cyclic AMP-elevating agents (forskolin, cyclic AMP analogues, phosphodiesterase inhibitors) on cell death and calcium influx.

Related Experiment Videos

Investigated the role of cyclic AMP-dependent protein kinase and protein phosphatases using specific inhibitors (H-89, okadaic acid).

Main Results:

Kainate exposure significantly increased cell death and calcium influx.
Agents that elevated cyclic AMP effectively prevented kainate-induced cell death.
These agents partially suppressed kainate-induced calcium influx.
The protective effect was linked to cyclic AMP-dependent protein kinase activity and protein phosphorylation.

Conclusions:

Elevating intracellular cyclic AMP levels protects oligodendrocytes from excitotoxicity.
This protection is achieved by reducing kainate-induced calcium influx via a mechanism involving cyclic AMP-dependent protein kinase-mediated phosphorylation.