Abstract:
:Quinolinic acid (QUIN), an excitotoxic compound present in the mammalian CNS and periphery, has been hypothetically linked to human neurodegenerative disorders such as Huntington's disease and epilepsy. Quinolinic acid phosphoribosyltransferase (QPRT), the catabolic enzyme of QUIN, is found in the CNS and peripheral organs where it may be a major influence on the tissue levels of QUIN. We have measured QPRT activity in human blood as a means of assessing one aspect of QUIN metabolism in humans. The enzyme was present in blood cells, platelets having a sixfold greater activity than erythrocytes, but was essentially absent from the plasma. In a blood cell fraction, enzyme activity was potently inhibited by phthalic acid (IC50 = 6.1 microM). Kinetic analyses conducted over a range of QUIN concentrations yielded Km values of 1.89-3.75 microM and Vmax values of 33.4-72.5 fmol nicotinic acid mononucleotide/h/mg protein. Enzyme activity varied 2.2-fold between normal individuals, was reasonably constant over a series of sampling intervals, and showed some diminution when blood was stored for 1 month at -20 degrees C. No differences of enzyme activity in erythrocytes or platelets were apparent between three Huntington's disease patients and their unaffected spouses. These data indicate that measurements of QPRT activities in blood are a convenient means to monitor QUIN metabolism in human subjects and that a deficiency of the enzyme is not apparent in Huntington's disease.
journal_name
J Neurochemjournal_title
Journal of neurochemistryauthors
Foster AC,Schwarcz Rdoi
10.1111/j.1471-4159.1985.tb05493.xsubject
Has Abstractpub_date
1985-07-01 00:00:00pages
199-205issue
1eissn
0022-3042issn
1471-4159journal_volume
45pub_type
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journal_title:Journal of neurochemistry
pub_type: 杂志文章
doi:10.1046/j.1471-4159.1994.63030997.x
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journal_title:Journal of neurochemistry
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journal_title:Journal of neurochemistry
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