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Biochim Biophys Acta. 2014 Jun;1843(6):1207-1215. doi: 10.1016/j.bbamcr.2014.03.004. Epub 2014 Mar 13.

The plant decapeptide OSIP108 prevents copper-induced apoptosis in yeast and human cells.

Author information

1
Centre of Microbial and Plant Genetics (CMPG), KU Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium.
2
Clinic for Transplantation Medicine, Münster University Hospital, Albert-Schweitzer-Campus 1, Building A14, D-48149 Münster, Germany.
3
Department of Medicine and the Stony Brook Cancer Center, University of Stony Brook, Stony Brook, New York, 11794, USA.
4
Department of Hepatology and Metabolic Center, University Hospital Gasthuisberg, Herestraat 49, 3000 Leuven, Belgium.
5
Department of Plant Systems Biology, VIB, Technologiepark 927, 9052, Ghent, Belgium.
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Contributed equally

Abstract

We previously identified the Arabidopsis thaliana-derived decapeptide OSIP108, which increases tolerance of plants and yeast cells to oxidative stress. As excess copper (Cu) is known to induce oxidative stress and apoptosis, and is characteristic for the human pathology Wilson disease, we investigated the effect of OSIP108 on Cu-induced toxicity in yeast. We found that OSIP108 increased yeast viability in the presence of toxic Cu concentrations, and decreased the prevalence of Cu-induced apoptotic markers. Next, we translated these results to the human hepatoma HepG2 cell line, demonstrating anti-apoptotic activity of OSIP108 in this cell line. In addition, we found that OSIP108 did not affect intracellular Cu levels in HepG2 cells, but preserved HepG2 mitochondrial ultrastructure. As Cu is known to induce acid sphingomyelinase activity of HepG2 cells, we performed a sphingolipidomic analysis of OSIP108-treated HepG2 cells. We demonstrated that OSIP108 decreased the levels of several sphingoid bases and ceramide species. Moreover, exogenous addition of the sphingoid base dihydrosphingosine abolished the protective effect of OSIP108 against Cu-induced cell death in yeast. These findings indicate the potential of OSIP108 to prevent Cu-induced apoptosis, possibly via its effects on sphingolipid homeostasis.

KEYWORDS:

Apoptosis; Ceramide; Copper; OSIP108; Saccharomyces cerevisiae

PMID:
24632503
PMCID:
PMC4045106
DOI:
10.1016/j.bbamcr.2014.03.004
[Indexed for MEDLINE]
Free PMC Article

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