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Calcium signaling in liver.
Lawrence D Gaspers1, Andrew P Thomas
1Department of Pharmacology and Physiology, New Jersey Medical School of University of Medicine and Dentistry of New Jersey, Medical Science Building, H609, 185 South Orange Avenue, P.O. Box 1709, Newark, NJ 07103-1709, USA.
Cell Calcium
|September 6, 2005
Summary
Hormones trigger calcium spikes in liver cells, which spread as waves to coordinate liver function. These intercellular calcium waves are crucial for transmitting signals and regulating metabolic processes within the liver.
Area of Science:
- Hepatocyte signaling and liver physiology.
Background:
- Hormones acting via inositol 1,4,5-trisphosphate (InsP3) induce transient cytosolic calcium ([Ca2+]i) spikes in hepatocytes.
- Oscillatory Ca2+ signals are critical for relaying extracellular stimuli to downstream metabolic pathways.
Purpose of the Study:
- To investigate the characteristics of InsP3-dependent calcium signaling in the intact perfused liver.
- To explore the cellular and subcellular mechanisms of calcium wave propagation.
Main Methods:
- Utilized confocal and wide-field fluorescence microscopy.
- Studied the inositol 1,4,5-trisphosphate (InsP3)-dependent signaling pathway in intact perfused liver.
Main Results:
- InsP3-dependent [Ca2+]i spikes manifest as waves propagating through cytoplasm and nucleus.
- Intercellular Ca2+ waves spread via gap junctions, encompassing entire lobular units in the liver.
- Translobular Ca2+ movement coordinates metabolic zones, influencing overall liver function.
Conclusions:
- Agonist-evoked [Ca2+]i signals in the liver exhibit wave-like propagation.
- Intercellular calcium wave propagation coordinates liver lobular function.
- Mechanisms of intercellular calcium wave propagation in the liver warrant further investigation.