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2015 ; 5
(ä): 12425
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Parallel damage in mitochondrial and lysosomal compartments promotes efficient
cell death with autophagy: The case of the pentacyclic triterpenoids
#MMPMID26213355
Martins WK
; Costa ÉT
; Cruz MC
; Stolf BS
; Miotto R
; Cordeiro RM
; Baptista MS
Sci Rep
2015[Jul]; 5
(ä): 12425
PMID26213355
show ga
The role of autophagy in cell death is still controversial and a lot of debate
has concerned the transition from its pro-survival to its pro-death roles. The
similar structure of the triterpenoids Betulinic (BA) and Oleanolic (OA) acids
allowed us to prove that this transition involves parallel damage in mitochondria
and lysosome. After treating immortalized human skin keratinocytes (HaCaT) with
either BA or OA, we evaluated cell viability, proliferation and mechanism of cell
death, function and morphology of mitochondria and lysosomes, and the status of
the autophagy flux. We also quantified the interactions of BA and OA with
membrane mimics, both in-vitro and in-silico. Essentially, OA caused
mitochondrial damage that relied on autophagy to rescue cellular homeostasis,
which failed upon lysosomal inhibition by Chloroquine or Bafilomycin-A1. BA
caused parallel damage on mitochondria and lysosome, turning autophagy into a
destructive process. The higher cytotoxicity of BA correlated with its stronger
efficiency in damaging membrane mimics. Based on these findings, we underlined
the concept that autophagy will turn into a destructive outcome when there is
parallel damage in mitochondrial and lysosomal membranes. We trust that this
concept will help the development of new drugs against aggressive cancers.