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Calcium-induced calcium release in neurones
1International Center of Molecular Physiology, Bogomoletz Institute of Physiology, Kiev, Ukraine.
Cell Calcium
|January 1, 1996
Summary
Neuronal calcium channels facilitate calcium-induced calcium release (CICR) from internal stores. This process, modulated by caffeine and cADPR, is crucial for neuronal function and calcium signaling.
Area of Science:
- Neuroscience
- Cell Biology
- Calcium Signaling
Background:
- Neurons utilize intracellular Ca2+ channels for calcium-induced calcium release (CICR) from endoplasmic reticulum stores.
- Cytoplasmic calcium concentration ([Ca2+]c) regulates these channels, influencing neuronal excitability and function.
Purpose of the Study:
- To investigate the role and regulation of CICR in various neuronal subtypes.
- To explore the pharmacological properties and modulators of neuronal CICR.
Main Methods:
- Pharmacological studies using caffeine and ryanodine to probe Ca2+ release.
- Electrophysiological recordings and [Ca2+]c measurements in sympathetic, sensory, and Purkinje neurons.
- Investigating the influence of transmembrane Ca2+ influx and basal [Ca2+]c on CICR.
Main Results:
- Caffeine induces Ca2+ release in diverse neurons, indicating multiple caffeine-sensitive channel subpopulations.
- Inhibition of CICR alters depolarization-triggered [Ca2+]c responses.
- CICR activation is gradual and influenced by store Ca2+ content and basal [Ca2+]c.
Conclusions:
- Neuronal CICR is a complex process involving multiple channel types and regulated by intracellular calcium levels.
- The second messenger cyclic ADP-ribose (cADPR) may modulate CICR efficacy, though its signaling pathway remains unclear.
- CICR plays a significant role in generating local [Ca2+]c signals and regulating neuronal functions.