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Structure and Dynamics of the Fusion Pores in Live GH-Secreting Cells Revealed Using Atomic Force Microscopy

Departments of Physiology and Pharmacology, Wayne State University, School of Medicine (S.-J.C., B.P.J.), Detroit, Michigan 48201; and Departments of Biomedical Sciences, College of Veterinary Medicine (K.J., A.G., S.J.), and Animal Science (L.L.A.), Iowa State University, Ames, Iowa 50011

Address all correspondence and requests for reprints to: Lloyd L. Anderson, Ph.D., Department of Animal Science, Iowa State University, 2356 Kildee Hall, Ames, Iowa 50011-3150. E-mail: llanders{at}iastate.edu

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.

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