secretory granules


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Related to secretory granules: Microtubules

secretory granules

[si′krēd·ə·rē ‚gran‚yülz]
(cell and molecular biology)
Accumulations of material produced within a cell for secretion outside the cell.
References in periodicals archive ?
LaN[O.sub.3] (<2 nm), however, passed through the PTM and penetrated between adjacent epithelial cells past the apical region containing the electron-dense secretory granules to the level of the nucleus in all five samples examined (Fig.
Note distinct deposits of immunoreaction along the basal plasmalemma (blank arrowheads), but no immunoreaction along the apical plasmalemma as well as the apical cytoplasm occupied with secretory granules. Bar represents 20 [micro]m.
Ultrastructurally the secretory granules of the type D cells are remarkably similar to those of asteroids with planktotrophic larvae (Barker, 1978; Haesaerts et al., 2005a), suggesting that the secretion of type D cells is probably proteinaceous (Barker, 1978).
The cytoplasm was more abundant and polarized with the luminal aspect that contained relatively small membrane-bound, moderately dense secretory granules and a well-developed Golgi complex.
In normal and transgenic mice, cryptdin-positive cells having morphologic appearance of Paneth cells, with apical secretory granules demonstrable by Phloxine-Tartrazine stain were observed on the 7th postnatal day (4).
The cells of zones 2, 4, and 6 have numerous secretory granules. These cells are believed to secrete the proteins or mucoprotein related to the digestion of food.
Typical mucous secretory granules have not been detected in the ciliated UCC component of two different sipunculid species: Sipunculus nudus (this report) and Phascolosoma agassizii (Dybas, 1976).
Their cytoplasm is filled with membrane-bound, electron-dense secretory granules whose diameter varies between 0.7 and 1.5 [mu]m (Fig.
Some of the basic science makes a compelling case for PRP: Activated platelets have secretory granules. These modify the pericellular milieu through release of a variety of growth factors by secretory granules.
It is worth noting that underdeveloped organelles and absence of secretory granules was the most prominent feature of the chromophobe cells (Fig.
In most endocrine cells, the hormones are contained in secretory granules that, in response to a series of cellular mechanisms culminating with an increase in the intracellular [Ca.sup.2+] levels, fuse with the cell membrane and release the hormone molecules.
The epididymis in this period is in full activity, the epithelium of the corpus showed cylindrical and elongated cells with a large amount of secretory granules inside, and the enlarged lumen of the corpus was full of spermatozoa and secretory granules (Figure 2(a)).