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2014 ; 23
(11
): 2791-801
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Znē? dyshomeostasis caused by loss of ATP13A2/PARK9 leads to lysosomal
dysfunction and alpha-synuclein accumulation
#MMPMID24334770
Tsunemi T
; Krainc D
Hum Mol Genet
2014[Jun]; 23
(11
): 2791-801
PMID24334770
show ga
Mutations in ATP13A2 (PARK9) cause Kufor-Rakeb syndrome (KRS) characterized by
juvenile-onset parkinsonism, pyramidal signs and dementia. PARK9 belongs to type
5 P-type ATPase with its putative function as a cation transporter. Loss of PARK9
leads to lysosomal dysfunction and subsequent ?-synuclein (?-Syn) accumulation.
However, the mechanistic link between PARK9 and lysosomal dysfunction remains
unclear. Here, we found that patient fibroblasts expressing mutant PARK9 or
primary neurons with silenced PARK9 exhibited increased sensitivity to
extracellular zinc (Zn(2+)). This effect was rescued with the Zn(2+) chelators
clioquinol or TPEN. PARK9-deficient cells showed decreased lysosomal
sequestration of Zn(2+) and increased expression of zinc transporters.
Importantly, increased concentrations of Zn(2+) (Zn(2+) stress) resulted in
lysosomal dysfunction that was partially restored by expression of wild-type
PARK9. Zn(2+) stress also caused increased expression of ?-Syn and consequently
decreased activity of the lysosomal enzyme glucocerebrosidase. Together, these
data suggest that PARK9 loss of function leads to dyshomeostasis of intracellular
Zn(2+) that in turn contributes to lysosomal dysfunction and accumulation of
?-Syn. It will be of interest to examine whether therapeutic lowering of zinc may
prove beneficial for patients with KRS.