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  • 1
    ISSN: 1432-2277
    Schlagwort(e): Key words Lung preservation solution ; neutrophil ; chemotaxis ; adhesion molecule
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Polymorphonuclear leukocyte (PMN) activation and PMN-endothelial cell interactions may cause graft failure due to ischemia-reperfusion injury after lung transplantation. We investigated the effects of Euro-Collins solution (EC), low-potassium dextran solution (LPD), and EC plus pentoxifylline (EC-PTXF) on adhesion molecule (CD11b/CD18 and L-selectin) expression, chemotaxis, and oxidative burst of PMN. PMN from healthy human volunteers were incubated with EC, LPD, and EC-PTXF, and, in controls, without preservation solution. LPD exerted a suppressive effect on PMN chemotaxis as compared to EC (P 〈 0.05), but had no attenuating effect on the increase of CD11b/CD18, the shedding of L-selectin, and intracellular oxidant generation. EC-PTXF attenuated the expression of CD11b/CD18 and the oxidative burst as compared to EC alone (P 〈 0.05). These effects of LPD and PTXF on PMN function may contribute to successful organ preservation in transplantation.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 221 (1982), S. 505-519 
    ISSN: 1432-0878
    Schlagwort(e): Cortical filament layer ; Spatial organization ; Fine structure ; Motive force generation ; Amoeba proteus
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The fine structural organization of a cortical filament layer in normal locomoting Amoeba proteus was demonstrated using improved fixation and embedding techniques. Best results were obtained after application of PIPES-buffered glutaraldehyde in connection with substances known to prevent the depolymerization of F-actin, followed by careful dehydration and freeze-substitution. The filament layer is continuous along the entire surface; it exhibits a varying thickness depending on the cell polarity, measuring several nm in advancing regions and 0.5–1 μm in retracting ones. Two different types of filaments are responsible for the construction of the layer: randomly distributed thin (actin) filaments forming an unordered meshwork beneath the plasma membrane, and thick (myosin) filaments mostly restricted to the uroid region in close association with F-actin. The cortical filament layer generates the motive force for amoeboid movement by contraction at posterior cell regions and induces a pressure flow that continues between the uroid with a high hydrostatic pressure and advancing pseudopodia with a low one. The local destabilization of the cell surface as a precondition for the formation of pseudopodia is enabled by the detachment of the cortical filament layer from the plasma membrane. This results in morphological changes by the active separation of peripheral hyaloplasmic and central granuloplasmic regions.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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