ISSN:
1432-0878
Keywords:
Adenohypophysis
;
Neurohypophysis
;
Exocytosis
;
Freeze-etching
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Medicine
Notes:
Summary The freeze-etching technique was used in studies of cell surface phenomena during the release of secretory products from the adenohypophysis and from neurosecretory terminals of rats in which exocytosis had been stimulated by the administration of hypothalamic extracts (somatotrophs, thyrotrophs, gonadotrophs and mammotrophs) or severe hemorrhage (neurohypophysis). The observations suggest that secretory granules are extruded through an opening at the tip of a protrusion of the cellular surface. The protrusions seem to result from the abutting of secretory granules on the inner surface of the plasma membrane. These structural details revealed in freeze-etched preparations have not been seen previously in conventional micrographs of ultrathin sections and may provide a clue to the mechanism of secretion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00307441
