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  • 1
    ISSN: 1432-0568
    Keywords: Supraoptic nucleus ; Cell nucleus ; Perichromatin granules ; Nuclear inclusions ; Osmotic stimulation ; Cycloheximide ; Coiled body
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The distribution of perichromatin granules (PGs), a storage form of pre-mRNAs, was studied in supraoptic neurons of control and osmotically stimulated rats, and also after treatment with cycloheximide, a protein-synthesis inhibitor. In non-cycloheximide-treated rats, neuronal activation by dehydration significantly decreased the number of PGs. Conversely, PGs were drastically increased in the supraoptic neurons of dehydrated rats treated with cycloheximide for 4 h. This suggests that cycloheximide does not interfere with the transcriptional activation induced by dehydration, but it affects the processing of newly synthesized pre-mRNAs. Moreover, protein-synthesis inhibition was associated with the formation of intranuclear bundles of tubular filaments.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0568
    Keywords: Silver staining ; Neurons ; Nucleolus ; Supraoptic nucleus ; Hypothalamus ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The present paper describes a simple, efficient method for silver impregnation of supraoptic nuclei of the rat hypothalamus using a modification of the ammoniacal silver technique of Cajal (1903). This procedure, involving a silver-developer sequence in tissue blocks prior to plastic embedding, permits the simultaneous study of Ag-impregnated supraoptic neurons at both light and electron microscopic levels. Visualization of secretory magnocellular neurons impregnated by this technique using the electron microscope reveals a good preservation of nuclear structures. A selective accumulation of silver grains was observed over heterochromatin clumps and nucleoli, which allows the identification of the nucleolar fibrillar centers and also the dense fibrillar component as the main areas involved in the silver reaction. The meaning of such a silver-distribution pattern is discussed in the light of recent ultrastructural and biochemical data.
    Type of Medium: Electronic Resource
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