Maturation-related changes in mass and elemental contents of secretory granules as measured by electron-microprobe
| Autor: | Mark K. Goddard, Murray R. Robinovitch, Dale E. Johnson, Kenneth T. Izutsu, Marie Cantino, Teresa K. Oswald, Jeanne M. Iversen |
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| Rok vydání: | 1991 |
| Předmět: |
Male
Exocrine gland Histology chemistry.chemical_element Fractionation Electron microprobe Calcium Cytoplasmic Granules Pathology and Forensic Medicine medicine Animals Parotid Gland Water content Chemistry Granule (cell biology) Ripening Rats Inbred Strains Cell Biology Permeation Rats Microscopy Electron medicine.anatomical_structure Biochemistry Biophysics Sulfur Electron Probe Microanalysis |
| Zdroj: | Cell and tissue research. 263(3) |
| ISSN: | 0302-766X |
| Popis: | The relationship between granule density, protein content, and Ca and S contents were studied in two secretory granule fractions, from parotid glands of the rat, previously shown to constitute different stages in granule maturation. The density of the lighter fraction was between 1.133 and 1.142 g/ml, while that of the heavier fraction was greater than 1.142 g/ml. The mean protein content of the denser granules was 12% greater than that of the lighter granules (P less than 0.03), while the dry-mass elemental concentrations in the two granule fractions were unchanged. These results indicate that protein is added to granules during the maturation process (presumably by vesicular traffic), and that the resulting increase in granule density is not driven simply by decrease in water content and/or increased concentrations of inorganic Ca or S in the granules. The elemental concentration values also indicate that the diffusible elements permeate the granule membrane during the fractionation procedures. |
| Databáze: | OpenAIRE |
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