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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Diabetologia 22 (1982), S. 258-263 
    ISSN: 1432-0428
    Schlagwort(e): Plasma glucagon ; mice ; muscular dystrophy ; gel filtration ; immunoglobulins ; glucose ; insulin
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The present investigation was undertaken to determine and characterize glucagon immunoreactivity in plasma from normal NMRI mice and from dystrophic mice and their unaffected littermates of the 129/ReJ strain. Very young dystrophic mice (6 weeks old) displayed much higher basal levels of plasma glucagon immunoreactivity than normal mice. In contrast, plasma concentrations of insulin and glucose were lower in these dystrophic mice than in normal NMRI mice. The plasma glucagon levels declined with age in both strains during the time-period studied (1.5–5 months). Gel filtration of plasma from dystrophic as well as normal mice on Sephadex G-200 revealed that a large part of the total glucagon immunoreactivity was eluted in fractions containing the immunoglobulins. The amount of the ‘true’ glucagon part was lower in plasma from normal mice (about 0.2 μg/l) than in plasma from mice of the dystrophic strain (0.4–0.5 μg/l)). This finding was indirectly corroborated by the observation that a large intravenous glucose load decreased plasma glucagon by approximately 0.2 μg/l in the non-dystrophic NMRI strain and by about 0.4–0.6 μg/l in the dystrophic strain. Thus, the ability of glucose to suppress glucagon secretion appeared unaffected in the dystrophic mice. Glucose-induced insulin release, however, was considerably impaired in these animals. It is concluded that mice of the dystrophic 129/ReJ strain have higher plasma levels of ‘true’ glucagon than mice of the non-dystrophic NMRI strain. Whether the abnormally high plasma glucagon levels in the dystrophic strain, particularly in very young dystrophic mice, might contribute to the development of the muscular dystrophy remains to be elucidated.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    European journal of clinical pharmacology 21 (1982), S. 403-408 
    ISSN: 1432-1041
    Schlagwort(e): glibenclamide ; diabetes ; insulin ; kinetics ; blood glucose ; relationship to meals ; absorption
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Medizin
    Notizen: Summary In an attempt to assess whether intake of glibenclamide before meals would improve its therapeutic capacity, the present investigation compared the effect of glibenclamide 2.5mg t.i.d. given before and together with meals. In addition, these effects were compared with that of glibenclamide given as a single morning dose of 7.5mg. The subjects studied were six Type 2 diabetics not previously exposed to sulphonylurea drugs. Irrespective of dosage and mode of administration, addition of glibenclamide to a standardized breakfast, lunch and dinner enhanced plasma IRI concentrations and reduced blood glucose concentrations as compared to administration of meals without the drug. The different modes of glibenclamide administration did not differ significantly with respect to IRI responses. However, the blood glucose reduction after breakfast was significantly greater when glibenclaimde 2.5mg had been given before the meal than when 2.5 or 7.5mg were given with the meal; a similar, but non-significant tendency was observed after lunch; no consistent difference was seen after dinner. Food intake did not affect glibenclamide kinetics. It appears that administration of glibenclamide 2.5mg before breakfast improved glucose utilization following the breakfast load, due to earlier attainment of an effective concentration of glibenclamide.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1432-0878
    Schlagwort(e): Skeletal muscle ; Protamine ; Endocytosis ; Autophagic vacuolation ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The uptake in vitro of horseradish peroxidase (HRP) in mouse skeletal muscle was examined by electron microscopy and chemical determination. In muscles exposed to an HRP solution for 60 min at +37°C, HRP infiltrated the basal lamina of muscle fibres and caused an intense labelling of their sarcolemma. In addition HRP was found within the transverse tubules. Exposure to HRP for 30 min at +37°C followed by HRP together with a polycationic protein (protamine) for 30 min at +37°C caused an intracellular vesicular uptake of HRP. Intracellular HRP was found in numerous vesicles, membrane limited bodies and vacuoles. Protamine also induced focal autophagic vacuolation with progressive muscle fibre degeneration. An intracellular HRP uptake or muscle cell vacuolation could not be detected in the absence of protamine or when the incubation temperature was + 4°C. Chemical determination of HRP uptake was in general agreement with the morphological results. The uptake of HRP in the presence of protamine was stimulated at +31°C and blocked at +4°C. The results suggest that in skeletal muscle in vitro intracellular uptake of macromolecules occurs by endocytosis.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Cell & tissue research 186 (1978), S. 1-11 
    ISSN: 1432-0878
    Schlagwort(e): Skeletal muscle (Mouse) ; Acid phosphatase ; Lysosomes ; Vacuolation ; Endocytosis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Incubation of mouse skeletal muscle in a physiological Ringer solution containing protamine (60 μg/ml) at +37° C for 1 h induced ultrastructural changes including proliferation of tubular profiles and vesicles at the I-band level close to the A-I junction, formation of numerous acid phosphatase positive lysosomes in the longitudinal sarcoplasmic reticulum and autophagic vacuolation starting at the level of the A-I junction. Biochemical determination of acid phosphatase in the incubated muscles showed that protamine caused an increase in acid phosphatase activity of about 25 % compared to enzyme activities obtained from muscles incubated without protamine at +37°C or with protamine at +4°C. The morphological findings suggest that the vesicles arising adjacent to the A-I junction originate from transverse tubules. Such vesicles, designated as endocytic, may acquire acid phosphatase activity in the longitudinal SR and be active in an autophagic process resulting in large vacuoles. A causal relationship between endocytosis and lysosomal activation is suggested.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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