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  • Title: Tissue sources of serum alkaline phosphatase in 34 hyperthyroid cats: a qualitative and quantitative study.
    Author: Foster DJ, Thoday KL.
    Journal: Res Vet Sci; 2000 Feb; 68(1):89-94. PubMed ID: 10684764.
    Abstract:
    The concentration of serum alkaline phosphatase (SALP) is commonly elevated in hyperthyroid cats. Agarose gel electrophoresis, in tris -barbital-sodium barbital buffer, with and without the separation enhancer neuraminidase, was used to investigate the sources of the constituent isoenzymes of SALP in serum samples from 34 hyperthyroid cats, comparing them to sera from five healthy cats and to tissue homogenates from liver, kidney, bone and duodenum. Contrary to previous reports, treatment of serum with neuraminidase made differentiation of the various isoenzymes more difficult to achieve. A single band corresponding to the liver isoenzyme (LALP) was found in 100 per cent of healthy cats. Eighty-eight per cent of the hyperthyroid cats showed two bands, corresponding to the liver and bone (BALP) isoenzymes while 12 per cent showed a LALP band alone. In hyperthyroid cats, there was a significant correlation between the serum L-thyroxine concentrations and the SALP concentrations. These findings suggest pathological changes in both bone and liver in most cases of feline thyrotoxicosis.
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