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  • 1
    ISSN: 1432-1440
    Keywords: Noninsulin-dependent diabetics ; Insulin treatment ; Sulfonylurea treatment ; High-density lipoproteins2 ; Postheparin-lipolytic activity ; Insulinunabhängiger Diabetes ; Insulintherapie ; Sulphonylharnstofftherapie ; High-density-lipoproteins2 ; Post-heparin-lipolytische Aktivität
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Wirkung der Behandlungsart des Diabetes auf die Lipide und Lipoproteine und auf die post-heparin-lipolytische Aktivität (PHLA) im Plasma von 26 insulinunabhängigen Diabetikern wurde untersucht. Die Patienten waren bisher mit einer maximal effektiven Dosis von Glibenclamid behandelt worden. Sie wurden in 2 randomisierte Gruppen unterteilt: In Gruppe I wurde Glibenclamid durch ein Insulindepotpräparat ersetzt. Insulin wurde einmal täglich verabreicht und die Dosis solange gesteigert, bis eine zufriedenstellende Einstellung erreicht war. In Gruppe II wurde Glibenclamid durch Placebo ersetzt. Zum Zeitpunkt der Wochen 0, 1, 3, 7 und 12 nach Umstellung der Therapie wurden folgende Parameter bestimmt: Blutglukose, die Plasmakonzentrationen von Cholesterin, Triglyzeriden, Phospholipiden, HDL-cholesterin, very-low-density-lipoproteins, intermediate-density-lipoproteins, low-density-lipoproteins, high-density-lipoproteins2 (HDL2), HDL3 und die PHLA. Zu Beginn der Studie bestanden keine signifikanten Unterschiede zwischen Gruppe I und II im Hinblick auf alle oben angeführten Parameter. Die Umstellung von Glibenclamid auf Insulin resultierte in einem ständigen Abfall der Blutglukose (p〈0,01) bei gleichzeitigem Anstieg der HDL2 (p〈0,01) und der PHLA (p〈0,01) während des Untersuchungszeitraums. Im Gegensatz dazu hatte die Umstellung von Glibenclamid auf Placebo keinen signifikanten Effekt. Die Ergebnisse zeigen, daß bei insulinunabhängigen Diabetikern, die mit Sulphonylharnstoffpräparaten nicht mehr befriedigend eingestellt waren, eine Umstellung auf Insulin nicht nur zu einer weitgehenden Normalisierung des Glukosestoffwechsels sondern auch zu einer signifikanten Besserung der Störung im Lipoproteinstoffwechsel bei Diabetes mellitus führt. Glibenclamid per se dürfte weder die Konzentration der HDL2-fraktion noch die PHLA beeinflussen.
    Notes: Summary To study the effect of treatment on plasma lipid and lipoprotein concentration and on postheparin-lipolytic activity (PHLA) in plasma, 26 noninsulin-dependent diabetics were investigated who were treated with maximally effective doses of glibenclamide. The patients were randomly divided into two groups: In group I, glibenclamide was replaced by a long-acting insulin preparation given once daily at variable doses until satisfactory metabolic control was achieved. In group II, glibenclamide was replaced by placebo. At weeks 0, 1, 3, 7, and 12 after change of treatment, the following parameters were determined: Blood glucose, plasma concentrations of cholesterol, triglycerides, phospholipids, HDL cholesterol, very-low-density lipoproteins, intermediate-density lipoporteins, low density lipoproteins, high-density lipoproteins2 (HDL2), HDL3, and PHLA. At week 0, no statistically significant differences existed between group I and group II with respect to all parameters mentioned above. The replacement of glibenclamide by insulin resulted in a continous decrease of blood glucose (p〈0.01) with a concomitant increase in HDL2 (p〈0.01) and in PHLA (p〈0.01) during the period of investigation. In contrast, replacement of glibenclamide by placebo exerted no significant influence on all determined parameters during 12 weeks. These data suggest that in noninsulin-dependent diabetics, who are inadequately controlled by sulfonylureas, an adequate insulin substitution is necessary to correct, apart from glucose metabolism, the impaired lipoprotein metabolism of diabetes mellitus. Sulfonylureas per se seem not to decrease the HDL2 fraction nor the PHLA.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1440
    Keywords: Liver cirrhosis ; Lipoproteins ; LCAT ; Hepatic lipase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 12 patients with unequivocal post-alcoholic end-stage liver cirrhosis were compared with 12 healthy controls with regard to the plasma concentrations of lipids, lipoproteins (by rate zonal ultra-centrifugation) and apolipoproteins of high-density-lipoproteins (HDL) (by disc electrophoresis), as well as to the activities of lecithin-cholesterol acyltransferase (LCAT) in plasma and of hepatic lipase (HL) in post-heparin plasma. The cirrhotic group showed the following differences (all significant at thep〈0.01 level) from the control group: Total cholesterol, HDL-cholesterol, very-low-density-lipoproteins (VLDL), HDL, and HL were decreased. Intermediate-density-lipoproteins (IDL) were not detectable in the cirrhotic group. Low-density-lipoproteins (LDL) did not differ significantly from controls. However, LDL from cirrhotic patients contained more triglycerides but less esterified and free cholesterol (allp〈0.01). The percentage apolipoprotein composition of HDL did not differ significantly between controls and cirrhotics. Surprisingly, LCAT acivity in plasma as well as the ratios between esterified and free cholesterol in plasma, LDL, and HDL were nearly identical in both groups. It seems likely that LCAT activity decreases only in the states of acute or subacute liver injury or of biliary obstruction. Severe chronic liver damage as in our cases of end-stage liver cirrhosis without any signs of acute liver injury exhibits apparently no defect in cholesterol esterification.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 60 (1982), S. 337-342 
    ISSN: 1432-1440
    Keywords: Hyperthyreosis ; Hypothyreosis ; Lipoproteins ; Postheparin lipolytic activity ; Hyperthyreose ; Hypothyreose ; Lipoproteine ; Postheparin-lipolytische Aktivität
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Konzentration der Hauptlipoproteindichteklassen und die Post-heparin-lipolytische Aktivität (PHLA) wurden im Plasma von 12 hyperthyreoten und 8 hypothyreoten Patienten im Vergleich mit 12 euthyreoten, stoffwechselgesunden Kontrollpersonen bestimmt. Low-density-lipoproteins (LDL) und high-density lipoproteins2 (HDL2) waren bei Hyperthyreose erniedrigt (p〈0,01) und bei Hypothyreose erhöht (p〈0,01). Im Hinblick auf die Konzentration der very-low-density-lipoproteins (VLDL) und der HDL3 bestanden keine signifikanten Unterschiede, während die intermediate-density-lipoproteins (IDL) bei hypothyreoten Patienten erhöht waren (p〈0,05). Die PHLA war bei Hyperthyreose erhöht (p〈0,01) und bei Hypothyreose erniedrigt (p〈0,01). Die chemische Zusammensetzung der LDL und HDL2 von Patienten mit Hyper- und Hypothyreose sowie die Apolipoproteinzusammensetzung des Proteinanteils der HDL2 unterschieden sich nicht signifikant von denen der Kontrollen. Bei Analyse der Daten aller untersuchten Individuen ergab sich keine signifikante Beziehung zwischen VLDL und HDL2, während HDL2 und PHLA signifikant negativ korrelierten (p〈0,05). Es wird vermutet, daß HDL2 zusätzlich zu den LDL als Träger des bei der Hypothyreose vermehrt vorhandenen Cholesterins fungieren.
    Notes: Summary The concentration of the main lipoprotein density classes and the postheparin lipolytic activity (PHLA) were determined in the plasma of 12 hyperthyroid and eight hypothroid patients in comparison with 12 euthyroid, metabolically healthy individuals. Low-density lipoproteins (LDL) and high-density lipoproteins2 (HDL2) were decreased in hyperthyreosis (p〈0.01) and increased in hypothyreosis (p〈0.01). No significant differences could be detected with respect to the concentration of very low-density lipoproteins (VLDL) as well as for HDL3, whereas intermediate-density lipoproteins (IDL) were higher in hypothyreotics than in controls (p〈0.05). PHLA was increased in hyperthyreosis (p〈0.01) and decreased in hypothyreosis (p〈0.01). The chemical composition of LDL and HDL2 as well as the apolipoprotein composition of the protein moiety of HDL2 in hyperthyreosis and in hypothyreosis did not significantly differ from those in the control group. When data from all individuals studied were analyzed, no significant relationship could be detected between the concentrations of VLDL and HDL2, whereas HDL2 and PHLA correlated in a negative manner (p〈0.05). It is suggested that HDL2, in addition to LDL, acts as carrier protein for the cholesterol increasingly yielded in hypothyreosis.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 62 (1984), S. 593-594 
    ISSN: 1432-1440
    Keywords: Lipoprotein lipase ; Blood-pH in vivo ; Acidosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Diseases associated with acidotic blood-pH, such as chronic renal disease, diabetes mellitus or chronic alcoholism, show a marked impairment of lipoprotein lipase. Therefore we influenced blood-pH in 3 healthy subjects by infusions to get alkalotic, neutral and acidotic blood-pH on three days in series. On each day blood-pH from capillary blood and post-heparin lipoprotein lipase from fasting plasma was determined. In comparison to neutral blood-pH in vivo, alkalosis did not influence lipoprotein lipase. In contrast, during artificial acidosis, lipoprotein lipase was impaired significantly (p〈0.01). Therefore, it seems, that acidosis inhibits lipoprotein lipase in vivo.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1440
    Keywords: Hepatic lipase ; Lipoproteins ; Hyperlipemia ; Intermediate-density lipoproteins (IDL)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The main lipoprotein density classes, namely very-low-density lipoproteins (VLDL), intermediate-density lipoproteins (IDL), low-density lipoproteins (LDL), high-density lipoproteins2 (HDL2) and HDL3 were investigated with respect to their influence on hepatic lipase (HTGL) activity in vitro. Lipoproteins from pooled normal plasma (NP) and from pooled hyperlipemic plasma (HP) were prepared by means of sequential ultracentrifugation. Hepatic lipase was determined radioenzymatically after preincubation with protamine sulfate. It could be demonstrated that IDL from HP were able to stimulate HTGL activity by approximately 100% above the baseline value. HDL3 from both NP and HP revealed an inhibiting effect on HTGL activity. VLDL, LDL, and HDL2 exhibited no significant effect on HTGL activity. It is speculated that HTGL could possibly represent a second pathophysiological pathway for the catabolism of IDL in hyperlipemia but this presumption is supported by only a few investigations in vivo.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 25 (1983), S. 535-538 
    ISSN: 1432-1041
    Keywords: emotional stress ; forearm blood flow ; variance of forearm blood flow ; thioridazine ; toliprolol ; plethysmography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Forearm blood flow was measured four times per minute by venous occlusion plethysmography during rest and during a brief emotionally stressful mental task. During emotional stress not only was the mean forearm blood flow increased, but the single blood flow values fluctuated more than at rest. The greater fluctuation, expressed statistically as the variance, was an indicator of emotional stress, at least as sensitive as the mean increase in the blood flow. Both a tranquillizer (thioridazine) and a β-blocker (toliprolol) reduced the greater variance during the emotionally stressful situation in doses insufficient to diminish the mean increase in forearm blood flow.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0584
    Keywords: Human bone marrow cells ; Erythropoiesis ; Serum-free medium ; CFU-e ; BFU-e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of the present study was to investigate the influence of human lipoproteins on CFU-e and BFU-e proliferation from human bone marrow in a serum-free system. In our previously described miniaturized agar system the main lipoprotein-density-classes from human plasma, namely very low density lipoproteins (VLDL), intermediate density lipoproteins (IDL), low density lipoproteins (LDL), high density lipoproteins2 (HDL2) and HDL3 and a mixture of all the five lipoproteins were added in rising concentrations (from 1/10 to normal human plasma concentration) to serum-free medium containing delipidated and deionized bovine serum albumin (BSA), iron saturated transferrin and erythropoietin. The results demonstrate that all lipoproteins markedly increased the CFU-e and BFU-e proliferation after 7 and 14 days of incubation, respectively. Moreover, the lipoproteins induced a shift towards a lower threshold concentration of erythropoietin. Serumlike conditions were obtained if LDL and the mixture of lipoproteins were added to serum-free medium. Furthermore, in the serum-free cultures a maturation to the mature erythrocyte could be found.
    Type of Medium: Electronic Resource
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