Role of Prion protein in premature senescence of human fibroblasts

[en] Prion protein (PrP) is essentially known for its capacity to induce neurodegenerative prion diseases in mammals caused by a conformational change in its normal cellular isoform (PrPC) into an infectious and disease-associated misfolded form, called scrapie isoform (PrPSc). Although its sequence is highly conserved, less information is available on its physiological role under normal conditions. However, increasing evidence supports a role for PrPC in the cellular response to oxidative stress. In the present study, a new link between PrP and senescence is highlighted. The role of PrP in premature senescence induced by copper was investigated. WI-38 human fibroblasts were incubated with copper sulfate (CuSO4) to trigger premature senescence. This induced an increase of PrP mRNA level, an increase of protein abundance of the normal form of PrP and a nuclear localization of the protein. Knockdown of PrP expression using specific small interfering RNA (siRNA) gave rise to appearance of several biomarkers of senescence as a senescent morphology, an increase of senescence associated β-galactosidase activity and a decrease of the cellular proliferative potential. Overall these data suggest that PrP protects cells against premature senescence induced by copper. © 2017 Elsevier B.V.

Disciplines :

Biochemistry, biophysics & molecular biology

Author, co-author :

Boilan, E.; Unité de Recherche en Biologie Cellulaire (URBC) - Namur Research Institute for Life Sciences (Narilis), University of Namur, Belgium, CESI, Chaussée de Louvain 290, 5004 Bouge, Belgium

Winant, V.; Unité de Recherche en Biologie Cellulaire (URBC) - Namur Research Institute for Life Sciences (Narilis), University of Namur, Belgium

Dumortier, E.; Unité de Recherche en Biologie Cellulaire (URBC) - Namur Research Institute for Life Sciences (Narilis), University of Namur, Belgium

Elmoualij, Benaïssa ; Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Histologie

Quatresooz, Pascale ; Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Histologie

Osiewacz, H. D.; Institute of Molecular Biosciences, Johann Wolfgang Goethe University, Frankfurt am Main, Germany

Debacq-Chainiaux, F.; Unité de Recherche en Biologie Cellulaire (URBC) - Namur Research Institute for Life Sciences (Narilis), University of Namur, Belgium

Toussaint, O.; Unité de Recherche en Biologie Cellulaire (URBC) - Namur Research Institute for Life Sciences (Narilis), University of Namur, Belgium

Language :

English

Title :

Role of Prion protein in premature senescence of human fibroblasts

Publication date :

2017

Journal title :

Mechanisms of Ageing and Development

ISSN :

0047-6374

Publisher :

Elsevier Ireland Ltd

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 27 November 2020

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