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  • 1
    ISSN: 1432-2013
    Keywords: Hyperosmolality ; ANP ; cGMP ; Inner medullary collecting duct cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The present study was undertaken to explore the acute effect of hyperosmolality on the response of cultured rat inner medullary collecting duct (IMCD) cells to atrial natriuretic peptide (ANP). In contrast to the stimulatory effect of chronic incubation (12 h) in hypertonic medium, it was found that short-term incubation (〈 2 h) reversibly suppressed the ANP-dependent cyclic guanosine monophosphate (cGMP) production. Urea, NaCl and mannitol were equi-potent as the osmolyte in suppressing the ANP-dependent cGMP production. Receptor binding assay revealed that hyperosmolality induced a rapid and marked reduction of the maximum binding (B max) of ANP without a significant change of the dissociation constant (K d). Pretreatment with protein kinase C inhibitors (calphostin-C, staurosporin) or with cytoskeleton modulators (cytochalasin-B, colchicine) did not affect the inhibitory effect of hyperosmolality. In conclusion, acute hypertonicity inhibited the ANP-induced cGMP production in contrast to chronic hypertonicity, and reduction of the number of ANP binding sites was considered to be a mechanism responsible for the inhibitory effect of hypertonicity.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 259 (1981), S. 350-353 
    ISSN: 1435-1536
    Keywords: Anticancer drug ; 1-(2-tetrahydrofuryl)-5-fluorouracil ; Sodium poly-α ; L-glutamate ; Interaction ; Viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Wechselwirkung zwischen 1-(2-Tetrahydrofuryl)-5-fluorouracil und Na-Poly-α,L-glutamat wurde mit den Methoden der Spektroskopie und der Viskositätsmessung untersucht. Aus den Bindungsdaten wurden die molare Änderung von Entropie und Enthalpie und die Zahl der Brückenstellen des Polymeren berechnet. Der Wert von ΔG° beträgt ca. −10 Kcal/mol. Die Affinität ist also sehr groß.
    Notes: Summary The interaction of an anticancer drug, 1-(2-tetrahydrofuryl)-5-fluorouracil with sodium poly-α,L-glutamate in aqueous solution was studied with a spectral method and viscosity measurement. From the binding data, the molar change in enthalpy, entropy and the number of binding sites on polymer were calculated. The standard affinity of 1-(2-tetrahydrofuryl)-5-fluorouracil is about −10 kcal/ol with sodium poly-α,L-glutamate. The affinity is also very high.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 259 (1981), S. 774-774 
    ISSN: 1435-1536
    Keywords: Malachite green ; acridine orange ; Na-poly-a ; L-glutamate ; Interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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