Subcellular organization of calcium signalling in hepatocytes and the intact liver.

A. P. Thomas, D. C. Renard-Rooney, G. Hajnóczky, L. D. Robb-Gaspers, C. Lin, T. A. Rooney

Research output: Contribution to journalReview article

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Abstract

Hepatocytes respond to inositol 1,4,5-trisphosphate (InsP3)-linked agonists with frequency-modulated oscillations in the intracellular free calcium concentration ([Ca2+]i), that occur as waves propagating from a specific origin within each cell. The subcellular distribution and functional organization of InsP3-sensitive Ca2+ pools has been investigated, in both intact and permeabilized cells, by fluorescence imaging of dyes which can be used to monitor luminal Ca2+ content and InsP3-activated ion permeability in a spatially resolved manner. The Ca2+ stores behave as a luminally continuous system distributed throughout the cytoplasm. The structure of the stores, an important determinant of their function, is controlled by the cytoskeleton and can be modulated in a guanine nucleotide-dependent manner. The nuclear matrix is devoid of Ca2+ stores, but Ca2+ waves in the intact cell propagate through this compartment. The organization of [Ca2+]i signals has also been investigated in the perfused liver. Frequency-modulated [Ca2+]i oscillations are still observed at the single cell level, with similar properties to those in the isolated hepatocyte. The [Ca2+]i oscillations propagate between cells in the intact liver, leading to the synchronization of [Ca2+]i signals across part or all of each hepatic lobule.

Original languageEnglish (US)
Pages (from-to)18-35; discussion 35-3549
JournalCiba Foundation symposium
Volume188
StatePublished - 1995

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    Thomas, A. P., Renard-Rooney, D. C., Hajnóczky, G., Robb-Gaspers, L. D., Lin, C., & Rooney, T. A. (1995). Subcellular organization of calcium signalling in hepatocytes and the intact liver. Ciba Foundation symposium, 188, 18-35; discussion 35-3549.