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Prion protein suppresses perturbation of cellular copper homeostasis under oxidative conditions.

Abstract：

:Prion protein (PrP) binds copper and exhibits superoxide dismutase-like activity, while the roles of PrP in copper homeostasis remain controversial. Using Zeeman graphite furnace atomic absorption spectroscopy, we quantified copper levels in immortalized PrP gene (Prnp)-deficient neuronal cells transfected with Prnp and/or Prnd, which encodes PrP-like protein (PrPLP/Dpl), in the presence or absence of oxidative stress induced by serum deprivation. In the presence of serum, copper levels were not significantly affected by the expression of PrP and/or PrPLP/Dpl, whereas serum deprivation induced a decrease in copper levels that was inhibited by PrP but not by PrPLP/Dpl. The inhibitory effect of PrP on the decrease of copper levels was prevented by overexpression of PrPLP/Dpl. These findings indicate that PrP specifically stabilizes copper homeostasis, which is perturbed under oxidative conditions, while PrPLP/Dpl overexpression prevents PrP function in copper homeostasis, suggesting an interaction of PrP and PrPLP/Dpl and distinct functions between PrP and PrPLP/Dpl on metal homeostasis. Taken together, these results strongly suggest that PrP, in addition to its antioxidant properties, plays a role in stabilizing cellular copper homeostasis under oxidative conditions.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Sakudo A,Lee DC,Yoshimura E,Nagasaka S,Nitta K,Saeki K,Matsumoto Y,Lehmann S,Itohara S,Sakaguchi S,Onodera T

doi

10.1016/j.bbrc.2003.12.020

subject

Has Abstract

pub_date

2004-01-23 00:00:00

pages

850-5

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006291X0302607X

journal_volume

313

pub_type

杂志文章

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