Regulation of dense core release from neuroendocrine cells revealed by imaging single exocytic events

J. K. Angleson, A. J. Cochilla, G. Kilic, I. Nussinovitch, W. J. Betz

Research output: Contribution to journalArticle

138 Scopus citations

Abstract

Using FM1-43 fluorescence, we have optically detected single exocytic and endocytic events in rat pituitary lactotrophs. About fifty discrete fluorescent spots abruptly appear around the entire surface of a cell bathed in FM1-43 and high-potassium saline. The spots, which also immunostain for prolactin, reflect the labeling of dense cores as well as membranes of exocytosed secretory granules. Stained cores are not released, but remain attached to the cell and are eventually endocytosed. However, in cells exposed to dopamine (or an analog, bromocriptine), the cores dissolve and are secreted after several seconds. Solubilization of dense cores is mediated through a reduction in cytoplasmic cyclic AMP. Thus, the composition of secretions from individual secretory granules is regulated.

Original languageEnglish (US)
Pages (from-to)440-446
Number of pages7
JournalNature neuroscience
Volume2
Issue number5
DOIs
StatePublished - May 1 1999

ASJC Scopus subject areas

  • Neuroscience(all)

Fingerprint Dive into the research topics of 'Regulation of dense core release from neuroendocrine cells revealed by imaging single exocytic events'. Together they form a unique fingerprint.

  • Cite this

    Angleson, J. K., Cochilla, A. J., Kilic, G., Nussinovitch, I., & Betz, W. J. (1999). Regulation of dense core release from neuroendocrine cells revealed by imaging single exocytic events. Nature neuroscience, 2(5), 440-446. https://doi.org/10.1038/8107