Cellular and subcellular heterogeneity of [Ca2+]i in single heart cells revealed by fura-2

W. G. Wier, M. B. Cannell, J. R. Berlin, E. Marban, W. J. Lederer

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Abstract

Digital imaging of calcium indicator signals (fura-2 fluorescence) from single cardiac cells has revealed different subcellular patterns of cytoplasmic calcium ion concentration ([Ca2+]i) that are associated with different types of cellular appearance and behavior. In any population of enzymatically isolated rat heart cells, there are (i) mechanically quiescent cells in which [Ca2+]i is spatially uniform, constant over time, and relatively low; (ii) spontaneously contracting cells, which have an increased [Ca2+]i, but in which the spatial uniformity of [Ca2+]i is interrupted periodically by spontaneous propagating waves of high [Ca2+]i; and (iii) cells that are hypercontracted (rounded up) and that have higher levels of [Ca2+]i than the other two types. The observed cellular and subcellular heterogeneity of [Ca2+]i in isolated cells indicates that experiments performed on suspensions ofcells should be interpreted with caution. The spontaneous [Ca2+]i fluctuations previously observed without spatial resolution in multicellular preparations may actually be inhomogeneous at the subcellular level.

Original languageEnglish (US)
Pages (from-to)325-328
Number of pages4
JournalScience
Volume235
Issue number4786
StatePublished - 1987
Externally publishedYes

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    Wier, W. G., Cannell, M. B., Berlin, J. R., Marban, E., & Lederer, W. J. (1987). Cellular and subcellular heterogeneity of [Ca2+]i in single heart cells revealed by fura-2. Science, 235(4786), 325-328.