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  • Exocytosis  (3)
  • Atrial appendage  (1)
  • Atrial natriuretic polypeptides  (1)
  • Atrial-specific granules  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Qualitative and quantitative analysis of granules in atrial appendage cardiocytes in different physiological states (1990)
    Springer
    Cell & tissue research 259 (1990), S. 529-534 
    Details
    ISSN: 1432-0878
    Keywords: Atrial appendage ; Atrial-specific granules ; Atrial natriuretic polypeptides ; Exocytosis ; Ultrastructure ; Rat (Sprague-Dawley)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Atrial appendage cardiocytes of mammals, including man, contain multiple cytoplasmic granules that vary in number in different physiological states. Using morphologic and comprehensive morphometric techniques, these granules were assessed in Sprague-Dawley rats following dehydration for 5 days, volume-loading by substituting 1% NaCl as drinking water for 7 days, unilateral nephrectomy plus volume-loading for 7 days, and in late term pregnant animals (18–20 days; term ≈21 days). Although principally located in the paranuclear region, granules were observed throughout the sarcoplasm. Cytological features indicative of synthetic activity and granule formation were readily apparent in all groups with the exception of pregnant rats where they were infrequently observed. Granule contents were released by exocytosis and observed in the right appendage of control, dehydrated and nephrectomy/volume-loaded groups and left appendage of volumeloaded animals. Exocytosis was not observed in pregnant animals. By point counting, the proportional volume of cardiocytes occupied by granules (V v ) in controls was significantly greater for right than for left appendage (2.12±0.22% vs 1.29±0.16%; mean±SEM;p〈0.05). A significantly similar difference was found for nephrectomy/volume-loaded animals. There was no significant difference inV v for right appendage between the control and experimental groups; for left appendage there was a significant increase inV v to 2.42±0.09% (p〈0.05) for volume-loaded animals only. Estimation of the maximum diameter of granule profiles in control animals was 238±9 nm and 230±6 nm for right and left appendages, respectively. The profile diameters in the left appendages of dehydrated (202±9 nm) and pregnant (200±7 nm) animals were significantly (p〈0.05) less than those of the control animals. The morphometric findings did not correlate with predictions based upon published biochemical data. In the course of this study, a previously unreported bimembranous, circular to ovoid structure was observed in the cardiocyte sarcoplasm of all animals; the nature and function of this structure is unknown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01740780
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Scanning and transmission electron-microscopic study of peripolar cells in the newborn lamb kidney (1993)
    Springer
    Cell & tissue research 274 (1993), S. 597-604 
    Details
    ISSN: 1432-0878
    Keywords: Peripolar cells ; Juxtaglomerular apparatus ; Cytoplasmic granules ; Exocytosis ; Electron microscopy ; Sheep, newborn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Scanning and transmission electron microscopy were used to study the ultrastructural characteristics and positions of granulated peripolar cells in newborn lamb kidney. Following tissue fixation by vascular perfusion in situ, the vascular pole region of the glomerulus was exposed for examination by scanning electron micoscopy following removal of the glomerular tuft. Peripolar cells were recognized by their surface morphology enabling their quantification and an assessment of the relationship of their position in the renal cortex. The prominent expression of peripolar cells in this species was confirmed. Almost every vascular pole examined revealed peripolar cells (405 out of 407; 99.5%) and thus, throughout the cortex, the distribution of peripolar cells was the same as the distribution of renal corpuscles. Larger, more protruding peripolar cells were observed in the outer cortical renal corpuscles. The numbers of peripolar cells encircling each vascular pole ranged from 1 to 10. There was no correlation between number of granulated peripolar cells at the vascular pole and the position of the renal corpuscle within the renal cortex. As viewed by transmission electron microscopy, organelles of protein synthesis were abundant in the cytoplasm of peripolar cells. Exocytosis of cytoplasmic granules was observed by both scanning and transmission electron microscopy implying that a process of regulative secretion occurs from these cells. The use of ultrastrural techniques has provided evidence supporting the concept that peripolar cells are prominent in the cuff region of each renal corpuscle of the newborn lamb and further-more that peripolar cells in this species most likely have a secretory function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314558
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Renin processing studied by immunogold localization of prorenin and renin in granular juxtaglomerular cells in mice treated with enalapril (1992)
    Springer
    Cell & tissue research 268 (1992), S. 141-148 
    Details
    ISSN: 1432-0878
    Keywords: Prorenin ; Renin ; Granular juxtaglomerular cell ; Immunogold technique ; Exocytosis ; Mouse (BALB/c)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Immunogold techniques were used to investigate renin processing within granular juxtaglomerular cells following short-term (6 h and 1 day) and long-term (4 weeks) enalapril treatment in female BALB/c mice. In control animals, renin protein labelling was localized to all types of granules (proto-, polymorphous, intermediate and mature) and to transport vesicles, whilst prorenin labelling was found in all these sites except mature granules, confirming that active renin is localized to mature granules only. Following short-term enalapril treatment, the exocytosis of renin protein from mature granules was increased. Long-term enalapril treatment resulted in increased numbers of transport vesicles and all types of granules, consistent with increased synthesis and storage of renin. More large intermediate granules contained discrete regions labelled for prorenin. Renin protein was exocytosed from individual and multiple granules, whilst prorenin was exocytosed from protoand intermediate granules. It is concluded that under normal conditions prorenin is secreted constitutively by bulk flow from transport vesicles. On the other hand, active renin is secreted regulatively from mature granules. In conditions of intense stimulation (angiotensin-converting enzyme inhibition treatment), increased synthesis of prorenin leads to enhanced secretion of prorenin by both constitutive and regulative pathways. Under these conditions, the conversion of prorenin to active renin is increased, with increased secretion of active renin occurring in a regulative manner. Furthermore, the localization of prorenin to one discrete region of large intermediate granules leads us to conclude, that cleavage of the prosegment of renin occurs with the transition of intermediate to mature granules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00338063
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    Paper (German National Licenses)
    Fulltext
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