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    Effects of chronic renal disease on the transport of vitamin A in plasma and urine of dogs (2003)

    Art
    Zeitschriftenartikel / wissenschaftlicher Beitrag
    Autoren
    Raila, Jens
    Forterre, Simone
    Kohn, Barbara
    Brunnberg, Leo
    Schweigert, Florian J
    Quelle
    American journal of veterinary research; 64(7) — S. 874–9
    ISSN: 0002-9645
    Sprache
    Englisch
    Verweise
    Pubmed: 12856772
    Kontakt
    Klinik für kleine Haustiere

    Oertzenweg 19 b
    Haus 1
    14163 Berlin
    +49 30 838 62356
    kleintierklinik@vetmed.fu-berlin.de

    Abstract / Zusammenfassung

    Objective:
    To determine plasma and urine concentrations of retinol, retinyl esters, retinol-binding protein (RBP), and Tamm-Horsfall protein (THP) in dogs with chronic renal disease (CRD).

    Animals:
    17 dogs with naturally developing CRD and 21 healthy control dogs.

    Procedure:
    A diagnosis of CRD was established on the basis of clinical signs, plasma concentrations of creatinine and urea, and results of urinalysis. Concentrations of retinol and retinyl esters were measured by use of reverse-phase high-performance liquid chromatography. Concentrations of RBP and THP were measured by use of sensitive ELISA systems.

    Results:
    Dogs with CRD had higher plasma concentrations of retinol, which were not paralleled by differences in plasma concentrations of RBP. Calculated ratio of urinary total vitamin A (sum of concentrations of retinol and retinyl esters to creatinine concentration) and ratio of the concentration of urinary retinyl esters to creatinine concentration did not differ between groups. However, we detected a significantly higher retinol-to-creatinine ratio in the urine of dogs with CRD, which was paralleled by a higher urinary RBP-to-creatinine ratio. Thus, in dogs with CRD, the estimated fractional clearance of total vitamin A, retinol, and RBP was increased. Furthermore, dogs with CRD had a reduced urinary THP-to-creatinine ratio.

    Conclusions and clinical relevance:
    Results of this study documented that CRD affects the concentrations of retinol in plasma and urine of dogs. Analysis of the data indicates that measurement of urinary RBP and urinary THP concentrations provides valuable information that can be helpful in follow-up monitoring of dogs with CRD.