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  • 1
    ISSN: 1432-0878
    Keywords: Muscle ultrastructure ; (Na+, K+)-ATPase localization ; Sarcotubules ; Sarcoplasmic reticulum ; Junctional SR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary ATPase activity sensitive to ouabain was examined in both cardiac (ventricular) and skeletal (tibialis anterior) muscle cells of the mouse. Short-term fixation was combined with incubation in a medium designed to reduce artifactual deposition of lead phosphate. With incubation medium containing Na+ and K+, Pb3 (PO4)2 precipitate appears throughout the sarcoplasmic reticulum (SR) of both cardiac and skeletal cells. The precipitate generally is heavier in the junctional SR than in network SR, although the two regions are interconnected. Ouabain (1 mM) eliminates activity in the network SR of myocardial cells, but only reduces it in skeletal muscle cells. The total ATPase activity of junctional cisternae of the SR of myocardial cells does not appear to be reduced by ouabain, whereas the activity of the terminal cisternae of skeletal muscle is substantially diminished. The use of an incubation medium containing zero K+ reduces the level of activity, but not consistently. These data suggest that (Na+, K+)-ATPase is present in the network SR of both cardiac and skeletal muscle cells, and probably in the terminal cisternae of skeletal muscle cells.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 143 (1974), S. 409-433 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Gonadotrophic cells in the pars distalis of Anolis carolinensis often contain juxtanuclear concentrations of filaments with diameters intermediate in size (approximately 100 Å) between microtubules and microfilaments. Their size and their substructure, which gives them a tubular appearance when they are displayed in cross-section, appear to place these filaments in the “intermediate filament” category (Ishikawa et al., '68). In their juxtanuclear position in the intact animal, the intermediate filaments are collected in randomly-oriented tangles. In castrated specimens of Anolis, gonadotrophs degranulate and elongate. During this elongation, increased numbers of microtubules appear in orientation parallel to the long axis of the cell, and the 100 Å filaments reassemble in rod-like masses oriented parallel to the microtubules. This apparent distributional interaction may facilitate the elongation of the cell. Intimate physical associations between the intermediate filaments and secretory granules suggest that the filaments may act in the movement of the granules during the processes of degranulation and secretion.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 136 (1972), S. 227-245 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The stellate cell in the pars distalis of Anolis carolinensis has been studied with the electron microscope. This cell type is characterized by the lack of secretory granules, and it possesses elongate processes that insert between secretory cells. Few cytoplasmic filaments are present in these processes, and desmosomes linking them to adjacent stellate cells or to secretory cells are seen infrequently in control animals. Stellate cells are often encountered in the caudal half of the pars distalis, but they are less commonly found in the rostral half. In animals undergoing thyroidal depression, thyroidectomy cells arise in the caudal pars distalis. Concurrently, stellate cells of that region hypertrophy and exhibit increased numbers of desmosomes, complex intercellular junctions, and micropinocytotic vesicles. Injected horseradish peroxidase penetrates the intercellular spaces, enters the micropinocytotic vesicles, and is transported to the interior of the stellate cell. It is suggested that stellate cells in Anolis under certain conditions may transport materials between the bloodstream and secretory cells.
    Type of Medium: Electronic Resource
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