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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 3 (1964), S. 372-386 
    ISSN: 1432-0533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 1. Der Durchtritt von mit Fluorescein sowie mit radioaktiv-I131 markiertem Albumin und Gamma-Globulin durch den Plexus chorioideus des Huhns und des Kaninchens wurdein vitro studiert. 2. Die Inkubation in Lösungen von fluorescenzmarkierten Substanzen (FLA, FLGG und Strophanthin K) brachte zwei Aufnahmeweisen im isolierten Plexus chorioideus des Huhns zum Vorschein, und zwar eine überwiegend stromale und eine überwiegend epitheliale Aufnahme. 3. Bei Raumtemperatur zeigten FLA und Strophanthin K ein rasches Eindringen in das Stroma ohne sichtbare Anhäufung im Plexusepithel. Diese Stromapassagen zeigten Eigenschaften, die mit dem aktiven Transport vergleichbar sind, d.h. der Einfluß niedriger Temperaturen und metabolischer Hemmsubstanzen. 4. Die Fähigkeit zur stromalen Aufnahme von FLA des Plexus chorioideus des Huhns tritt zwischen dem 9.—13. Tag des Embryonallebens auf. In keinem Stadium wurde ein Eindringen von FLGG in den Plexus chorioideus des Huhns beobachtet. 5. Die Inkubation von fluorescierenden Proteinen und Strophanthin K mit Zusatz von unmarkiertem Gamma-Globulin führte zu einer intensiven Aufnahme dieser Substanzen durch das Plexusepithel. Ein ähnlicher Effekt konnte bei Inkubation mit Zusatz von unmarkiertem Albumin nicht erzeugt werden. 6. Die Beobachtungen über die Aufnahme von radioaktivem Albumin und Gamma-Globulin durch den Plexus chorioideus des Kaninchens zeigten, daß die RIHSA-Aufnahme durch niedrige Temperaturen und durch metabolische Hemmstoffe verhindert wurde, während im Gegensatz hierzu die RIHSGG-Aufnahme durch niedrige Temperaturen lediglich herabgesetzt wurde. 7. Die Bedeutung dieser Beobachtungen wird besonders im Hinblick auf die mögliche Rolle des aktiven Transportes und der Pinocytose diskutiert.
    Notes: Summary 1. The passage of fluorescein labeled as well as radioactive I131 labeled albumin and gamma globulin into the choroid plexus of the chick and rabbit was studiedin vitro. 2. Incubations in solutions of fluorescent tracers [fluorescein labeled albumin (FLA), fluorescein labeled gamma globulin (FLGG), and Strophanthin K] revealed two patterns of uptake by the isolated chick choroid plexus characterized by either predominant stromal or epithelial uptake. 3. At room temperature FLA and Strophanthin K were shown to penetrate rapidly into the stroma without any visible accumulation of these tracers in the choroidal epithelium. This stromal passage revealed features compatible with active transport, i.e. effect of low temperature and of metabolic inhibitors. 4. The capacity for the stromal uptake of FLA by the chick choroid plexus was shown to develop between the 9th and 13th days of embryonic life. No penetration of FLGG into the chick choroid plexus was observed at any stage. 5. The incubations in fluorescent proteins and Strophanthin K with addition of unlabeled gamma globulin resulted in intense uptake of these tracers by the choroidal epithelium. No such effect was achieved in incubations with addition of unlabeled albumin. 6. The observations on the uptake of radioactive albumin and gamma globulin by the rabbit choroid plexus revealed that radioactive iodinated human serum albumin (RIHSA) uptake was inhibited by low temperature and by metabolic inhibitors whereas the uptake of radioactive iodinated human serum gamma globulin (RIHSGG) was reduced by low temperature only. 7. The significance of these observations particularly with reference to the possible role of active transport and pinocytosis is discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 151 (1978), S. 527-537 
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Newborn to 9-week-old kittens were anesthetized and then sacrificed by inserting a scalpel into the thoracic cavity and severing the descending aorta. The cerebella were removed and processed according to Golgi-Cox and rapid Golgi modifications. The results indicate that the dendritic processes of the granule cells undergo a marked postnatal maturation even though there is little postmigratory change in the size and shape of the cell body. A clubshaped swelling of the distal portions of the dendrites is observed by the end of the first week; this “claw” becomes multilobated by three weeks and displays elaborate digitiform projections by nine weeks. The sequence of postnatal development in the kitten appears to follow a time course similar to that observed in other species. A possible correlation between the postnatal development of the granule cell and the postnatal development of the spincocerebellar system is discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    American Journal of Anatomy 156 (1979), S. 533-542 
    ISSN: 0002-9106
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Long-Evans black-hooded rat pups underwent hemicerebellectomies at various postnatal ages. The animals were killed at 28 days of age and thoracolumbar segments of the spinal cord were removed and processed according to Golgi and Nissl techniques. Hemicerebellectomy at two and three days postnatally produced, in addition to cellular hypotrophy in Clarke's column, dendritic alterations which included a decrease in the number of primary dendrites and a reduction of the remaining dendrites to truncated stubs. Hemicerebellectomy at 21 days postnatally had little effect on either cell size or dendritic arborization. The role of the target nucleus in maintaining cell growth and dendritic arborization during critical developmental periods is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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