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Direct and indirect effects of corticosteroids on astrocyte function
1Department ofAnatomy, School of Health Sciences, Medical Faculty of the University of Pretoria, South Africa. resia.pretorius@up.ac.za
Reviews in the Neurosciences
|September 11, 2004
Summary
Corticosteroids impact astrocyte function, affecting brain energy and potentially causing memory loss in long-term users. This review details direct and indirect effects on these crucial brain cells.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- Astrocytes are vital glial cells in the central nervous system.
- They facilitate nutrient transport across the blood-brain barrier (BBB) and support neuronal communication.
- Astrocytes are the initial contact point for substances crossing the BBB.
Purpose of the Study:
- To review the direct and indirect effects of corticosteroids on astrocyte physiology.
- To elucidate the mechanisms by which corticosteroids alter astrocyte function.
- To explore the implications of these alterations for neuroenergetics and cognitive function.
Main Methods:
- Literature review of studies on corticosteroid effects on astrocytes.
- Analysis of direct impacts on astrocyte metabolic and transport functions.
- Examination of indirect impacts mediated by neurotransmitter and cytokine modulation.
Main Results:
- Direct effects include inhibited glucose transport, decreased glycogen synthesis, and reduced glutamate uptake by astrocytes.
- Indirect effects involve lowered neural serotonin, impacting astrocytic cAMP, cytokine activity, and GABA uptake.
- Corticosteroid-induced astrocyte impairment affects neuroenergetics.
Conclusions:
- Corticosteroids significantly alter astrocyte physiology through both direct and indirect mechanisms.
- Impaired astrocyte function contributes to altered brain energy metabolism.
- Chronic corticosteroid use may lead to memory impairment due to these effects on astrocytes.