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  • 1
    ISSN: 1432-2013
    Keywords: Rat Kidney ; Isolated Tubules ; Cyclic Adenosine 3′:5′-Monophosphate ; Parathyroid Hormone ; Norepinephrine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Isolated rat kidney cortex tubules were used as a model system to study the hormonal regulation of cyclic adenosine-3′: 5′-monophosphate (cAMP) levels in vitro. When incubated over 15 min, parathyroid hormone increased cAMP levels 4-fold in the absence of inhibitors of cAMP phosphodiesterase. Norepinephrine in a concentration of 5·10−7 M which had itself no effect on cAMP levels under this condition, inhibited the effect of parathyroid hormone by 50%. This effect of the catecholamines could be completely abolished by the addition of an α-receptor blocking agent, phentolamine. The addition of an inhibitor of cAMP phosphodiesterase, in a concentration sufficient to prevent the breakdown of extratubular cAMP, potentiated hormone effects on cAMP levels. The antagonism between catecholamines and parathyroid hormone on cAMP levels was however not abolished by this treatment. This indicated that catecholamines probably inhibited parathyroid hormone stimulated cAMP formation. Since most of the cAMP was found to be intratubular, it can be assumed that norepinephrine and parathyroid hormone interact in the same cell. Proximal tubular sodium reabsorption and renal gluconeogenesis are discussed as possible events of this hormone interaction.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2013
    Keywords: proximal convoluted tubule ; anglotensin II ; phenylephrine ; phospholipid turnover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Angiotensin II and phenylephrine significantly increased phospholipid turnover in cortical tubule suspensions. To further localize this effect we studied the32P incorporation into phosphatidylcholine (PC) and phosphatidylinositol (PI) in single dissected proximal convoluted tubules of mouse nephron. Both hormones significantly stimulated32P labeling of PC and PI indicating that the proximal tubule is a target site of angiotensin II and phenylephrine action.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-198X
    Keywords: Key words Proteinuria ; Knowledge-based system ; Expert system ; Evaluation ; Decision support
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  A computerized Urine Protein Expert System (UPES) measuring creatinine, total protein, albumin, IgG, α1-microglobulin, α2-macroglobulin, and N-acetyl-β-D-glucosaminidase, together with urine dipstick testing for granulocyte esterase and hemoglobin pseudoperoxidase, and measurement of serum creatinine had been found to be useful in adults for differentiating between renal disorders. The objective of this study was to investigate UPES for identifying the different types of proteinuria and their underlying prerenal, glomerular, tubular, and postrenal causes in 146 children characterized by routine and invasive nephrological investigations. UPES proved to be a useful tool in pediatric renal patients after refinements were implemented in the program. Comparing UPES with the pediatric nephrologist’s interpretation of all available clinical and laboratory data, UPES diagnosed glomerulopathies in 46 (75%) of 61 patients. In a further 23% it suggested glomerular involvement by indicating either a disturbed glomerular permeability or increased excretion of albumin. Tubular proteinuria was correctly described by UPES in 23 (100%) patients with different tubulopathies. UPES revealed normal kidney function in all healthy children and all children with remission of renal disorders. Therefore, UPES can be regarded as a useful tool in the automated differentiation of renal diseases in children.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 409 (1987), S. 411-415 
    ISSN: 1432-2013
    Keywords: Glycerophosphorylcholine ; Rat renal papilla ; Cellular osmoregulation ; Organic osmolytes ; Anndiuresis ; Diuresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Glycerophosphorylcholine (GPC) — an organic solute which is considered to be involved in cellular osmoregulation in the renal medulla — was determined by means of an enzymatic assay in various zones of the rat kidney and in papillary tubule suspensions. In antidiuresis, GPC content in cortex, outer medulla and papillary tip was 0.64, 14.6, and 108.9 mmol/kg fresh weight, respectively. Significant concentrations of GPC could not be detected in the urine or in the peripheral plasma. The sharp increase in GPC concentration from cortex to papillary tip was partially abolished by the induction of diuresis by either waterloading or furosemide. These manoeuvres, however, did not change cortical GPC content. Papillary tubule suspensions prepared from hydrogenic rats contained only slightly less GPC per g protein than whole, papillae from antidiuretic animals. Incubation of tubules over 120 min did not lead to a singnificant loss of GPC which is in accordance with the low activity of GPC degrading enzymes in papillary tissue. The results confirm the intracellular localization of GPC and provide further evidence that this substance plays a substantial role in the osmoregulation of renal papillary cells.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 324 (1986), S. 343-344 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 324 (1986), S. 308-308 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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