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  • 1975-1979  (2)
  • Microperfusion  (1)
  • Urat uptake  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 53 (1975), S. 261-264 
    ISSN: 1432-1440
    Keywords: Urat uptake ; erythrocyte ; hyperuricemia ; gout ; Harnsäureaufnahme ; Erythrocyt ; Hyperurikämie ; Gicht
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 19 Patienten mit primärer Hyperurikämie, 6 mit sekundärer Hyperurikämie, 17 mit primärer Gicht und 30 Kontrollpersonen wird die Aufnahme von 2-C14 Harnsäure in die Erythrocyten gemessen. Es zeigt sich, daß die Erythrocyten von Gichtpatienten signifikant weniger Harnsäure aufnehmen als die von Kontroilpersonen. Dagegen unterscheiden sich die primären und sekundären Hyperurikämiepatienten nicht signifikant von den Kontrollen. Der Unterschied in der Aufnahme von Harnsäure bei Erythrocyten von Gichtpatienten und Kontrollen betrifft hauptsächlich den Anfangsteil der Aufnahmekinetik. Es wird die mögliche pathophysiologische Bedeutung der verminderten Harnsäureaufnahme für das Entstehen der Harnsäurepräcipitationen bei Gicht diskutiert und auf die Möglichkeit hingewiesen, den Harnsäure-Tracer-Aufnahmetest als diagnostisches Hilfsmittel für die Früherkennung der Gicht anzuwenden.
    Notes: Summary The uptake of 2-C14 urate by erythrocytes was measured in 19 patients with primary hyperuricemia, 6 patients with secondary hyperuricemia, 17 patients with primary gout and 30 controls. The uptake of urate in patients with primary gout was significantly lower than in the controls. In contrast no such difference could be observed in patients with primary and secondary hyperuricemia. The uptake of labeled urate by erythrocytes from gouty patients is especially diminished in the early phase of the uptake kinetics. The possible relevance of this finding for the pathogenesis of urate precipitation in gout is discussed. Further, we consider the application of the tracer urate uptake by erythrocytes as an aid in the early diagnosis of gout.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 374 (1978), S. 243-248 
    ISSN: 1432-2013
    Keywords: Oxalate ; Wistar rat ; Microperfusion ; Microinfusion ; Organic acid secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Renal transport of14C-oxalate was studied in the rat by clearance and micropuncture techniques. The ultrafilterability of oxalate was 0.98±0.02 (n=7). Fractional clearance of oxalate was significantly above unity in antidiuresis and volume expansion: mean 1.24 ±0.04 (n=115). Pyrazinamide (1.1·10−3 mol/kg BW) and probenecid (0.35·10−3 mol/kg BW) had no significant effect on oxalate clearance. P-aminohippurate (1.45·10−3 mol/kg BW) and urate (0.48 ·10−3 mol/kg BW) depressed the fractional clearance of oxalate significantly from 116 to 91 and from 125 to 90%, respectively. Excess excretion of14C-oxalate over3H-inulin was invariably demonstrable in peritubular microperfusion experiments (n=5) and in microinfusions underneath the kidney capsule (n=4). Together with the first 50% of3H-inulin 58±2% of the total14C-oxalate were excreted in the peritubular microperfusions, and 64±3% in the subcapsular microinfusions. In tubular microinfusion experiments (n=36) urinary14C-oxalate recovery was almost complete after early proximal microinfusion (93±4%) and complete after late proximal microinfusion (102±4%). In continuous microperfusion experiments of proximal tubules (n=42) a small but highly significant outflux of14C-oxalate of 7% per mm perfusion distance was found. The data suggest that oxalate is freely filterable at the glomerular site. A small but significant amount of oxalate is reabsorbed in the proximal nephron. Most likely at the same site and in the pars recta oxalate is secreted and tubular load increased to 124% of filtered load. This amount is excreted in final urine. The secretion of oxalate is inhibited by organic acids which are known to be secreted by the proximal tubule and the pars recta.
    Type of Medium: Electronic Resource
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