Journal
CELL CYCLE
Volume 8, Issue 4, Pages 639-642Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/cc.8.4.7794
Keywords
calreticulin; ERp57; endoplasmic reticulum stress; caspase; exocytosis
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Funding
- Fonds zur Forderung der wissenschaftlichen Forschung (Austria) [S-9304-B05]
- Fonds zur Forderung der wissenschaftlichen Forschung (Austria)
- Swedish Research Council (Vetenskapsradet)
- Ligue Nationale contre le Cancer (Equipe labellisee)
- European Commission
- Canceropole Ile-de-France
- Fondation de France and Fondation pour la Recherche Medicale
- Austrian Science Fund (FWF) [W 901] Funding Source: researchfish
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The pre-apoptotic exposure of calreticulin (CRT) on the cell surface determines the efficient engulfment of mouse or human tumor cells by antigen-presenting dendritic cells. CRT exposure is rapidly induced by anthracyclins and ionizing irradiation and follows a complex signal transduction pathway that is interrupted by depletion of PERK, caspase-8, BAP31, Bax, Bak or SNAREs, as well as by knock-in mutation of eIF2 alpha (to make it non-phosphorylable by PERK) or BAP31 (to render it uncleavable by caspase-8). Here, we show that yeast (Saccharomyces cerevisiae) can expose the CRT orthologue CNE1 on the surface in response to cell death induced by the anthracylin mitoxantrone (MTX). This MTX-triggered CNE1 translocation is abolished by knockout of the yeast orthologues of PERK (Gcn2), BAP31 (Yet3) and SNAREs (Nyv1, Sso1). Altogether, our data point to the existence of an ancestral and cell death-related CRT exposure pathway with conserved elements shared between unicellular fungi and mammals.
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