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Calcium in the brain under physiological and pathological conditions
1Laboratory of Experimental Brain Research, Lund University Hospital, Sweden.
European Neurology
|January 1, 1990
Summary
Calcium acts as a vital messenger in the brain, regulating cellular responses. Pathological increases in intracellular calcium concentrations, particularly via glutamate-activated channels, can lead to uncontrolled reactions and cell damage.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Calcium ions (Ca2+) are critical intracellular messengers regulating numerous cellular processes.
- Dysregulation of calcium homeostasis is implicated in various neurological disorders.
Purpose of the Study:
- To review the multifaceted role of calcium in the brain under both normal and disease states.
- To elucidate the mechanisms of calcium entry and intracellular release.
- To discuss the calcium hypothesis of cell necrosis.
Main Methods:
- Literature review of physiological and pathological roles of calcium in the brain.
- Examination of calcium channel subtypes, including voltage-sensitive and agonist-operated channels.
- Analysis of intracellular calcium release mechanisms.
Main Results:
- Calcium serves as a key regulator of metabolic pathways and cellular responses.
- Voltage-sensitive calcium channels (L, T, N) and agonist-operated calcium channels (AOCCs) are involved in calcium signaling.
- Glutamate receptor-gated AOCCs are primary contributors to postsynaptic calcium entry.
- Pathological calcium overload can trigger uncontrolled calcium-activated reactions, leading to cell necrosis.
Conclusions:
- Proper calcium signaling is essential for normal brain function.
- Aberrant calcium influx, especially through glutamate-activated AOCCs, plays a significant role in pathological conditions like cell necrosis.
- Understanding calcium's role is crucial for developing therapeutic strategies for neurological diseases.