Article (Scientific journals)
Early downregulation of Mcl-1 regulates apoptosis triggered by cardiac glycoside UNBS1450.
Cerella, C.; Muller, Florian; Gaigneaux, A. et al.
2015In Cell death & disease, 6, p. 1782
Peer reviewed
 

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Keywords :
Antineoplastic Agents/pharmacology; Apoptosis/drug effects/physiology; Calotropis/metabolism; Cardenolides/pharmacology; Cell Line, Tumor; Down-Regulation/drug effects; Humans; Jurkat Cells; Leupeptins/pharmacology; MCF-7 Cells; Myeloid Cell Leukemia Sequence 1 Protein/biosynthesis/metabolism; Proto-Oncogene Proteins c-bcl-2/metabolism; Transcription, Genetic/genetics; bcl-X Protein/metabolism
Abstract :
[en] Cardiac glycosides (CGs), prescribed to treat cardiovascular alterations, display potent anti-cancer activities. Despite their well-established target, the sodium/potassium (Na(+)/K(+))-ATPase, downstream mechanisms remain poorly elucidated. UNBS1450 is a hemi-synthetic cardenolide derived from 2''-oxovorusharin extracted from the plant Calotropis procera, which is effective against various cancer cell types with an excellent differential toxicity. By comparing adherent and non-adherent cancer cell types, we validated Mcl-1 as a general and early target of UNBS1450. A panel of CGs including cardenolides ouabain, digitoxin and digoxin as well as bufadienolides cinobufagin and proscillaridin A allowed us to generalize our findings. Our results show that Mcl-1, but not Bcl-xL nor Bcl-2, is rapidly downregulated prior to induction of apoptosis. From a mechanistic point of view, we exclude an effect on transcription and demonstrate involvement of a pathway affecting protein stability and requiring the proteasome in the early CG-induced Mcl-1 downregulation, without the involvement of caspases or the BH3-only protein NOXA. Strategies aiming at preventing UNBS1450-induced Mcl-1 downregulation by overexpression of a mutated, non-ubiquitinable form of the protein or the use of the proteasome inhibitor MG132 inhibited the compound's ability to induce apoptosis. Altogether our results point at Mcl-1 as a ubiquitous factor, downregulated by CGs, whose modulation is essential to achieve cell death.
Disciplines :
Anatomy (cytology, histology, embryology...) & physiology
Author, co-author :
Cerella, C.
Muller, Florian ;  Université de Liège - ULiège > Cancer-Molecular Angiogenesis Laboratory
Gaigneaux, A.
Radogna, F.
Viry, E.
Chateauvieux, S.
Dicato, Mario
Diederich, M.
Language :
English
Title :
Early downregulation of Mcl-1 regulates apoptosis triggered by cardiac glycoside UNBS1450.
Publication date :
2015
Journal title :
Cell death & disease
eISSN :
2041-4889
Volume :
6
Pages :
e1782
Peer reviewed :
Peer reviewed
Available on ORBi :
since 28 May 2019

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