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2015 ; 114
(4
): 570-579
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Consequences of impaired purine recycling on the proteome in a cellular model of
Lesch-Nyhan disease
#MMPMID25769394
Dammer EB
; Göttle M
; Duong DM
; Hanfelt J
; Seyfried NT
; Jinnah HA
Mol Genet Metab
2015[Apr]; 114
(4
): 570-579
PMID25769394
show ga
The importance of specific pathways of purine metabolism for normal brain
function is highlighted by several inherited disorders, such as Lesch-Nyhan
disease (LND). In this disorder, deficiency of the purine recycling enzyme,
hypoxanthine-guanine phosphoribosyltransferase (HGprt), causes severe
neurological and behavioral abnormalities. Despite many years of research, the
mechanisms linking the defect in purine recycling to the neurobehavioral
abnormalities remain unclear. In the current studies, an unbiased approach to the
identification of potential mechanisms was undertaken by examining changes in
protein expression in a model of HGprt deficiency based on the dopaminergic rat
PC6-3 line, before and after differentiation with nerve growth factor (NGF).
Protein expression profiles of 5 mutant sublines carrying different mutations
affecting HGprt enzyme activity were compared to the HGprt-competent parent line
using the method of stable isotopic labeling by amino acids in cell culture
(SILAC) followed by denaturing gel electrophoresis with liquid chromatography and
tandem mass spectrometry (LC-MS/MS) of tryptic digests, and subsequent
identification of affected biochemical pathways using the Database for
Annotation, Visualization and Integrated Discovery (DAVID) functional annotation
chart analysis. The results demonstrate that HGprt deficiency causes broad
changes in protein expression that depend on whether the cells are differentiated
or not. Several of the pathways identified reflect predictable consequences of
defective purine recycling. Other pathways were not anticipated, disclosing
previously unknown connections with purine metabolism and novel insights into the
pathogenesis of LND.