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. 2002 Aug 15;366(Pt 1):265–272. doi: 10.1042/BJ20020148

Severe pyridine nucleotide depletion in fibroblasts from Lesch-Nyhan patients.

Lynette D Fairbanks 1, Gabriella Jacomelli 1, Vanna Micheli 1, Tina Slade 1, H Anne Simmonds 1
PMCID: PMC1222752  PMID: 11996669

Abstract

The relationship between a complete deficiency of the purine enzyme hypoxanthine-guanine phosphoribosyltransferase and the neurobehavioural abnormalities in Lesch-Nyhan disease remains an enigma. In vitro studies using lymphoblasts or fibroblasts have evaluated purine and pyrimidine metabolism with conflicting results. This study focused on pyridine nucleotide metabolism in control and Lesch-Nyhan fibroblasts using radiolabelled salvage precursors to couple the extent of uptake with endocellular nucleotide concentrations. The novel finding, highlighted by specific culture conditions, was a marked NAD depletion in Lesch-Nyhan fibroblasts. ATP and GTP were also 50% of the control, as reported in lymphoblasts. A 6-fold greater incorporation of [(14)C]nicotinic acid into nicotinic acid- adenine dinucleotide by Lesch-Nyhan fibroblasts, with no unmetabolized substrate (20% in controls), supported disturbed pyridine metabolism, NAD depletion being related to utilization by poly(ADP-ribose) polymerase in DNA repair. Although pyrimidine nucleotide concentrations were similar to controls, Lesch-Nyhan cells showed reduced [(14)C]cytidine/uridine salvage into UDP sugars. Incorporation of [(14)C]uridine into CTP by both was minimal, with more than 50% [(14)C]cytidine metabolized to UTP, indicating that fibroblasts, unlike lymphoblasts, lack active CTP synthetase, but possess cytidine deaminase. Restricted culture conditions may be neccesary to mimic the situation in human brain cells at an early developmental stage. Cell type may be equally important. NAD plus ATP depletion in developing brain could restrict DNA repair, leading to neuronal damage/loss by apoptosis, and, with GTP depletion, affect neurotransmitter synthesis and basal ganglia dopaminergic neuronal systems. Thus aberrant pyridine nucleotide metabolism could play a vital role in the pathophysiology of Lesch-Nyhan disease.

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Selected References

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