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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 63 (1985), S. 84-89 
    ISSN: 1432-1440
    Keywords: Thrombocytopenia ; Platelet survival ; 51Cr ; 111In
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Optimal labelling conditions of human platelets with111In-oxine were determined in vitro. Based on this optimized technique, platelet mean life span (MLS) and platelet sequestration site were comparatively evaluated in 79 patients with two labels,51Cr (n=26) and111In (n=53). Patients were subgrouped according to clinical criteria as autoimmune thrombocytopenic purpura (AITP) (group 1;n=49), hypersplenism (2;n=12), impaired thrombopoiesis (3;n=3), unclassified thrombocytopenia (4;n=6), and nonthrombocytopenic patients (5;n=9). In patients with AITP and hypersplenism the mean values for the MLS determined either with51Cr or with111In were lowered but the difference was not statistically significant, neither for group 1 (18.6 h vs 17.3 h;P〉0.2) nor for group 2 (94.7 vs 122.3 h;P〉0.2). The correlation between MLS and platelet counts in patients with AITP was significant for both labels (P〈0.001). The 15 min recovery tended to be higher with111In in all groups, but the difference was significant (P〈0.05) only for group 1. The sequestration sites were similar with both labels. We conclude that, contrary to previous reports, platelet survival studies yield similar results with both the51Cr and111In methods. Due to its distinct advantages111In is the label of choice for investigation of platelet kinetics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 57 (1979), S. 711-718 
    ISSN: 1432-1440
    Keywords: Menschliches Pepsinogen I ; Menschliches Pepsin I ; Immunoadsorbentien ; Human pepsinogen I ; Human pepsin I ; Immunoadsorbents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Immunochemical homogeneous human pepsinogen I-group (PgI) was purified by solid immunoadsorbent and by DEAE-chromatography from gastric mucosa. PgI contained five electrophoretic distinct bands at pH 8.2 but only four bands at pH 5.6. After acid activation human pepsin (PI) was separated from the inhibitory peptide by affinity chromatography using poly-L-lysine. Purified PgI contained 9–16% of the inhibitory peptide. The yield of PI was 64 to 85%. A 65% increase of specific activity was observed. PI demonstrated three bands in agar gel electrophoresis at pH 5.6. The pH range of PI was rather wide, showing two maxima at pH 2.0 and pH 3.0 with hemoglobin as substrate. Irreversible inactivation of PI was observed at pH 7.0 and at a temperature of 60° C. The Km-value of PI was 0.170 mmol as determined with N-acetyl-L-phenyl-alanyl-L-3,5 diiodotyrosine. The specific activity was 9.6 IU/mg (hemoglobin substrate) and 0.032 IU/mg (dipeptide substrate). Porc pepsinogen (PPg) and its activated pepsin (PP) was used for comparison. PP showed identical elution patterns in affinity chromatography. In AEE PPg and PP demonstrated both two components at pH 5.6 with different electrophoretic mobilities. The pH optimum of PP was observed at pH 2.0. PP was slightly more sensitive in alkali and heat inactivation than human P. A higher Km-value of PP of 0.082 mmol and higher specific activity as compared to human PI was observed.
    Notes: Zusammenfassung Die immunchemisch homogene menschliche Pepsinogen I-Gruppe (PgI) wurde aus Magenschleimhautextrakt durch Immunoadsorbentien und durch DEAE-Chromatographie gereinigt. PgI ergab anläßlich der elektrophoretischen Auftrennung bei pH 8,2 5, bei pH 5,6 nur 4 proteolytische Banden. Nach Säureaktivierung wurde menschliches Pepsin (PI) vom Inhibitor durch Affinitätschromatographie mit Hilfe von Poly-L-Lysine abgetrennt. Gereinigtes PgI enthielt 9–16% des Inhibitor-Peptids. Die Ausbeute von PI betrug 64–85%. Eine Zunahme der spezifischen Aktivität um 65% wurde beobachtet. PI ergab in der Agargelelektrophorese bei pH 5,6 drei proteolytische Banden. Der pH-Bereich von PI war ziemlich weit und ergab zwei Maxima bei pH 2,0 und pH 3,0 unter Verwendung von Hämoglobin als Substrat. Eine irreversible Inaktivierung von PI wurde bei pH 7,0 und bei 60° C beobachtet. Der mit N-Acetyl-L-Phenyl-Alanyl-L-3,5 Diiodotyrosin bestimmte Km-Wert von PI betrug 0,170 mmol. Die spezifische Aktivität betrug 9,6 IU/mg (Hämoglobinsubstrat) und 0,032 IU/mg (Dipeptidsubstrat). Pepsinogen vom Schwein (PPg) und dessen aktiviertes Pepsin (PP) wurde zum Vergleich mit untersucht. PP ergab ein identisches Elutionsmuster in der Affinitätschromatographie. Nach elektrophoretischer Auftrennung ergaben PPg und PP zwei proteolytische Banden bei pH 5,6, die jedoch unterschiedliche elektrophoretische Mobilitäten aufwiesen. Das pH-Optimum von PP lag bei pH 2,0. PP war etwas mehr empfindlich gegenüber Alkali- und Hitzeinaktivierung als menschliches P. Im Vergleich zum menschlichen PI wurden bei PP höhere Km-Werte von 0,082 mmol und höhere spezifische Aktivitäten beobachtet.
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