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Abnormal intracellular ca(2+)homeostasis and disease
L Missiaen1, W Robberecht, L van den Bosch
1Laboratory of Physiology, K.U.Leuven Campus Gasthuisberg O/N, Leuven, Belgium. Ludwig.Missiaen@med.kuleven.ac.be
Cell Calcium
|August 16, 2000
Summary
Cellular calcium (Ca2+) regulation is crucial for cell function. Dysfunctional Ca2+ transporters and channels are linked to numerous diseases, including muscle, skin, and neurological disorders, highlighting their importance in health.
Area of Science:
- Cellular Biology
- Biochemistry
- Physiology
Background:
- Free cytosolic calcium (Ca2+) concentration regulates diverse cell functions.
- Ca2+ enters cells via channels and Na+/Ca2+-exchanger, and is extruded by pumps and exchangers.
- Internal Ca2+ stores release and uptake Ca2+ through specific receptors and pumps, creating organized spatio-temporal signals.
Purpose of the Study:
- To review the critical role of Ca2+ transporters and channels in cellular function.
- To highlight the link between mutations in Ca2+ handling proteins and various human diseases.
- To underscore the significance of Ca2+ signaling in health and disease pathogenesis.
Main Methods:
- Literature review of studies on Ca2+ transport mechanisms.
- Analysis of genetic mutations affecting Ca2+ channels, pumps, and exchangers.
- Correlation of protein dysfunction with specific disease phenotypes.
Main Results:
- Mutations in ryanodine receptors, dihydropyridine receptors, and Ca2+ pumps cause skeletal muscle pathologies.
- Ca2+ pump mutations are implicated in skin diseases and hearing/vestibular problems.
- Aberrant Ca2+ channel function is linked to vision problems, epilepsy, ataxia, and neurodegenerative diseases.
- Antibodies against Ca2+ channels play a role in Lambert-Eaton myasthenic syndrome and potentially ALS.
- Inositol trisphosphate receptors are hypothesized to contribute to brain disorders.
- Ca2+ handling protein abnormalities are observed in cardiac conditions and diabetes.
Conclusions:
- Disruptions in cellular Ca2+ homeostasis due to transporter/channel dysfunction lead to a wide spectrum of diseases.
- Studying disease-causing mutations provides valuable insights into the cell biology of Ca2+ transporters.
- Ca2+ signaling pathways are vital targets for understanding and potentially treating numerous human pathologies.