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  • Ageing  (1)
  • Electron microscopy  (1)
  • Human skin  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 271 (1981), S. 341-346 
    ISSN: 1432-069X
    Keywords: Xeroderma pigmentosum ; Fibroblasten ; Tissue culture ; Ageing ; Xeroderma pigmentosum ; Fibroblasten ; Gewebekulturen ; Senescenz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die normalen gealterten Fibroblasten zeigen einen signifikanten hohen Anteil veränderter Enzyme. Diese Veränderungen werden als molekularbiologische Zeichen des Alterns betrachtet. Um die möglichen moleckularen Veränderungen mit De Sanctis-Cacchione-Syndrom, der schwersten Form des Xeroderma pigmentosum, bei dem Repair-Mechanismen auf UV der DNA defekt sind und die neurologischen Abnormalitäten offenbar einen beschleunigten Altersvorgang belegen, wurde die Hitzestabilität der Glucose-6-Phosphat-Dehydrogenase in rohen Extrakten von Hautfibroblastenkulturen untersucht. Es standen drei Patienten zur Untersuchung zur Verfügung. Bei den frühesten kulturellen Passagen zeigte sich der hitzelabile Anteil der Glucose-6-Phosphat-Dehydrogenase in den Zellen der Patienten vermehrt im Vergleich mit den normalen Kontrollen. Die Überlebenszeit der Zellkulturen zeigten keinen Unterschied zu den der Kontrollen. Es wurden keine bemerkenswerte Alterserscheinungen beobachtet. Der Anstieg der hitzelabilen Glucose-6-Phosphat-Dehydrogenase in Zellen der Patienten mit De Sanctis-Cacchione-Syndrom scheinen mehr direkt auf einen defekten Repair-Mechanismus der DNA hinzuweisen als sich aus dem Altern der Zellkulturen ableiten zu lassen.
    Notes: Summary The normal senescent fibroblasts in culture accumulate a significantly high proportion of altered enzymes, and the alterations are considered to be the manifestation of ageing in molecular terms. To detect the possible molecular alterations in patients with De Sanctis-Cacchione syndrome, the severest form of xeroderma pigmentosum, in which repair processes to UV light-damaged DNA are defective and the neurologic abnormalities are considered to reflect accelerated ageing, we studied the heat stability of glucose-6-phosphate dehydrogenase (G6PD) in crude extracts of cultured skin fibroblasts. Three patients with the syndrome were the center of our investigation. Even at early passage in culture the heat-labile portion of G6PD was increased in the cells from patients in comparison to normal controls. The life span of the cells in culture from patients was not reduced below normal age-matched controls, and no appreciable senescent appearance was observed. The increase in the heat-labile portion of G6PD from cells of De Sanctis-Cacchione syndrome patients to reflect that defective repair of DNA damage occurs, rather than being a direct result of ageing of cultured cells.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 282 (1990), S. 402-407 
    ISSN: 1432-069X
    Keywords: Electron microscopy ; Culture ; Hair cells ; Growth ; Differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cultured hair cells from 4-day-old C3H mice were studied by electron microscopy. The hair roots isolated from the skin by collagenase digestion were dispersed into a cell suspension by treatment with a mixture of trypsin and ethylenediaminetetraacetate. The cells were cultured in MCDB-153 (a medium containing seven growth factors) for 1, 3, 6 or 13 days. The number of cultured cells on day 3 was twice that on day 1, and stayed at the same level until day 13. By electron microscopy, some of the cells cultured for 1 day were seen to be undifferentiated and others already showed differentiation into various hair structures. Such differentiated cells disappeared on day 3 and most of the cells cultured for 3 days were undifferentiated. Cells cultured for 6 days were differentiated showing inner root sheath cell, hair cortical cell and medulla cell structures. The characteristics of these cultured cells corresponded well to those of in vivo cells of the hair tissues from the back skin of 7-day-old C3H mice. On day 13 degeneration occurred in the cultured cells. In none of these cultures were mesenchymal cells, such as fibroblasts, found. The present electron microscopic study reveals that immature cells obtained from mouse hair tissues proliferate in vitro and differentiate into several subpopulations corresponding to those of in vivo cell layers of hair tissues. The present culture technique may be useful for studies of hair cell growth and differentiation.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-069X
    Keywords: smg p25A ; Human skin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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