Structure and dynamics of the fusion pores in live GH-secreting cells revealed using atomic force microscopy

Earlier studies in live pancreatic acinar cells identified new cellular structures at the cell plasma membrane called 'pits' and 'depressions', where membrane-bound secretory vesicles dock and fuse to release vesicular contents. In the current study, using atomic force microscopy...

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Bibliographic Details
Published in:Endocrinology (Philadelphia) 2002-03, Vol.143 (3), p.1144-1148
Main Authors: Cho, Sang-Joon, Jeftinija, Ksenija, Glavaski, Aleksandra, Jeftinija, Srdija, Jena, Bhanu P, Anderson, Lloyd L
Format: Article
Language:English
Subjects:
Actins - metabolism
Animals
Cell Separation
Growth Hormone - metabolism
Hemolytic Plaque Technique
Immunohistochemistry
Microscopy, Atomic Force
Neurosecretory Systems - cytology
Neurosecretory Systems - metabolism
Pituitary Gland - cytology
Pituitary Gland - metabolism
Pituitary Gland - ultrastructure
Swine
Tissue Fixation
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Summary:Earlier studies in live pancreatic acinar cells identified new cellular structures at the cell plasma membrane called 'pits' and 'depressions', where membrane-bound secretory vesicles dock and fuse to release vesicular contents. In the current study, using atomic force microscopy we identify similar structures at the plasma membrane of GH-secreting cells of the pituitary and implicate their involvement in hormone release. Pits containing 100-200 nm in diameter depressions or fusion pores were identified in resting GH-secreting cells. Following stimulation of secretion the size of depression enlarged and gold-tagged GH antibody were found to bind to the pit structures in the stimulated GH cells. This study documents for the first time the presence of these structures and their involvement in secretions in a neuroendocrine cell.
ISSN:0013-7227
DOI:10.1210/en.143.3.1144