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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 66 (1988), S. 241-245 
    ISSN: 1432-1440
    Schlagwort(e): Erythropoietin ; Stability ; Radioimmunoassay ; Polycythemic mouse bioassay ; Recombinant DNA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Radioimmunoassays for erythropoietin are limited so far to a few specialized laboratories and this requires transport and storage of samples. We therefore tested the stability of immunoreactive erythropoietin in serum and plasma samples obtained from a uremic and a nonuremic anemic patient. No significant change in the concentration of immunoreactive erythropoietin was found in either serum or plasma samples for up to 14 days of storage. This type of stability was observed no matter whether the samples were stored at room temperature, 4° C, or −20° C. There was no difference between the estimates of erythropoietin in serum and heparinized plasma. Validity of the radioimmunoassay used in this study was demonstrated by parallelism of dilution curves of test specimens and the 2nd International Reference Preparation for erythropoietin and by a close correlation between the immunoreactivity and the bioactivity of the hormone, as assessed in the same samples by the exhypoxic polycythemic mouse bioassay. In conclusion the data obtained clearly indicate that the necessity of storage and transport of clinical samples does not limit the practicability of the radioimmunoassay for erythropoietin.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 66 (1988), S. 236-240 
    ISSN: 1432-1440
    Schlagwort(e): Recombinant human erythropoietin ; Stem cells ; Megakaryopoiesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Recombinant human erythropoietin (rhEpo), now available, might become increasingly more important for clinical use, e.g., in the treatment of anemia of chronic renal failure. As a prerequisite of clinical trials, we analyzed the stimulatory and suppressive effects of rhEpo on human hemopoiesis by adding rhEpo to in vitro cultures of nonadherent low-density bone marrow cells obtained from normal persons and from patients undergoing hemodialysis for chronic renal failure. rhEpo was shown to be an effective stimulus for erythroid and multilineage colony formation. The dose-response curve was similar for erythroid progenitors BFU-E from normal controls and patients with chronic renal failure. rhEpo had no effect on megakaryocytic colony formation nor on the megakaryocytic differentiation of multilineage stem cells. Because of a good stimulatory activity on erythroid and multilineage stem cells and lack of toxic effects, rhEpo might be useful in the treatment of certain kinds of anemia.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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