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. 1989 Sep 1;109(3):1219–1227. doi: 10.1083/jcb.109.3.1219

Simultaneous measurements of cytosolic calcium and secretion in single bovine adrenal chromaffin cells by fluorescent imaging of fura-2 in cocultured cells

PMCID: PMC2115761  PMID: 2768340

Abstract

The cytosolic free calcium concentration ([Ca2+]i) and exocytosis of chromaffin granules were measured simultaneously from single, intact bovine adrenal chromaffin cells using a novel technique involving fluorescent imaging of cocultured cells. Chromaffin cell [Ca2+]i was monitored with fura-2. To simultaneously follow catecholamine secretion, the cells were cocultured with fura-2-loaded NIH-3T3t cells, a cell line chosen because of their irresponsiveness to chromaffin cell secretagogues but their large Ca2+ response to ATP, which is coreleased with catecholamine from the chromaffin cells. In response to the depolarizing stimulus nicotine (a potent secretagogue), chromaffin cell [Ca2+]i increased rapidly. At the peak of the response, [Ca2+]i was evenly distributed throughout the cell. This elevation in [Ca2+]i was followed by a secretory response which originated from the entire surface of the cell. In response to the inositol 1,4,5-trisphosphate (InsP3)-mobilizing agonist angiotensin II (a weak secretagogue), three different responses were observed. Approximately 30% of chromaffin cells showed no rise in [Ca2+]i and did not secrete. About 45% of the cells responded with a large (greater than 200 nM), transient elevation in [Ca2+]i and no detectable secretory response. The rise in [Ca2+]i was nonuniform, such that peak [Ca2+]i was often recorded only in one pole of the cell. And finally, approximately 25% of cells responded with a similar Ca2+-transient to that described above, but also gave a secretory response. In these cases secretion was polarized, being confined to the pole of the cell in which the rise in [Ca2+]i was greatest.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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