Calcium and ph in anoxic and toxic injury

Brians Herman, Gregory J. Gores, Anna Liisa Nieminen, Toru Kawanishi, Andrew Harman, John J. Lemasters

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

The critical events that lead to the transition from reversible to irreversible injury remain unclear. Studies are reviewed that have suggested that a rise in cytosolic free Ca2+ initiates plasma membrane bleb formation and a sequence of events that leads ultimately to cell death. In recent studies, we have measured changes in cytosolic free Ca2+, mitochondrial membrane potential, cytosolic pH, and cell surface blebbing in relation to the onset of irreversible injury and cell death following anoxic and toxic injury to single hepatocytes utilizing multiparameter digitized video microscopy (MDVM). MDVM is an emerging new technology that permits single living cells to be labeled with multiple probes whose fluorescence is responsive to specific cellular parameters of interest. Fluorescence images specific for each probe are collected over time, and then digitized and stored. Image analysis and processing then permits quantitation of the spatial distribution of the various parameters within the single living cells. Our results indicate the following: (1) formation of plasma membrane blebs accompanies all types of injury in hepatocytes; (2) cell death is a rapid event, initiated by rupture of a plasma membrane bleb, and is coincident with the onset of irreversible injury; (3) an increase of cytosolic free Ca2+ is not the stimulus for bleb formation or the final common pathway leading to cell death; (4) a decrease of mitochondrial membrane potential precedes loss of cell viability; (5) cytosolic pH falls by more than 1 pH unit during chemical hypoxia. This acidosis protects against the onset of cell death.

Original languageEnglish (US)
Pages (from-to)127-148
Number of pages22
JournalCritical Reviews in Toxicology
Volume21
Issue number2
DOIs
StatePublished - 1990

ASJC Scopus subject areas

  • Toxicology

Fingerprint Dive into the research topics of 'Calcium and ph in anoxic and toxic injury'. Together they form a unique fingerprint.

  • Cite this

    Herman, B., Gores, G. J., Nieminen, A. L., Kawanishi, T., Harman, A., & Lemasters, J. J. (1990). Calcium and ph in anoxic and toxic injury. Critical Reviews in Toxicology, 21(2), 127-148. https://doi.org/10.3109/10408449009089876