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The relationship between cellular ion deregulation and acute and chronic toxicity
B F Trump1, I K Berezesky, M W Smith
1Department of Pathology, University of Maryland School of Medicine, Baltimore.
Toxicology and Applied Pharmacology
|January 1, 1989
Summary
Ion deregulation, particularly of cytosolic calcium ([Ca2+]i), is critical in cell injury progression. Elevated [Ca2+]i correlates with injury severity and cell death, playing a key role in acute and chronic conditions like neoplasia.
Area of Science:
- Cellular biology
- Pathophysiology
- Biochemistry
Background:
- Cell injury progresses through reversible and irreversible stages, culminating in cell death.
- Cytosolic calcium ([Ca2+]i) deregulation is a key factor in the transition to irreversible injury.
- Normal [Ca2+]i is tightly regulated at approximately 100 microM, significantly lower than extracellular Ca2+ ([Ca2+]e).
Purpose of the Study:
- To investigate the role of ion deregulation, specifically [Ca2+]i, in cell injury.
- To explore the relationship between [Ca2+]i levels and the severity of cell damage and death.
- To examine the involvement of [Ca2+]i in neoplasia and cell transformation.
Main Methods:
- Measurement of [Ca2+]i in various acute injury models (ischemia, HgCl2, calcium ionophores).
- Analysis of Ca2+ influx from extracellular sources and intracellular stores.
- Correlation of [Ca2+]i elevation with morphological changes and cell killing.
Main Results:
- Acute cell injury models consistently showed elevated [Ca2+]i.
- Increased [Ca2+]i levels directly correlated with the degree of cell injury and mortality.
- [Ca2+]i deregulation impacts cell division, differentiation, and wound repair, with differential effects on normal versus transformed cells.
Conclusions:
- Ion deregulation, especially of [Ca2+]i, is a critical factor in initiating acute and chronic cell injury, including neoplasia.
- Elevated [Ca2+]i accelerates degradative cellular processes, leading to cell death if not regulated.
- Understanding [Ca2+]i dynamics is crucial for comprehending cell injury and developing therapeutic strategies.