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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Hematol+Oncol
2017 ; 10
(1
): 67
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Therapeutic strategies of drug repositioning targeting autophagy to induce cancer
cell death: from pathophysiology to treatment
#MMPMID28279189
Yoshida GJ
J Hematol Oncol
2017[Mar]; 10
(1
): 67
PMID28279189
show ga
The 2016 Nobel Prize in Physiology or Medicine was awarded to the researcher that
discovered autophagy, which is an evolutionally conserved catabolic process which
degrades cytoplasmic constituents and organelles in the lysosome. Autophagy plays
a crucial role in both normal tissue homeostasis and tumor development and is
necessary for cancer cells to adapt efficiently to an unfavorable tumor
microenvironment characterized by hypo-nutrient conditions. This protein
degradation process leads to amino acid recycling, which provides sufficient
amino acid substrates for cellular survival and proliferation. Autophagy is
constitutively activated in cancer cells due to the deregulation of PI3K/Akt/mTOR
signaling pathway, which enables them to adapt to hypo-nutrient microenvironment
and exhibit the robust proliferation at the pre-metastatic niche. That is why
just the activation of autophagy with mTOR inhibitor often fails in vain. In
contrast, disturbance of autophagy-lysosome flux leads to endoplasmic reticulum
(ER) stress and an unfolded protein response (UPR), which finally leads to
increased apoptotic cell death in the tumor tissue. Accumulating evidence
suggests that autophagy has a close relationship with programmed cell death,
while uncontrolled autophagy itself often induces autophagic cell death in tumor
cells. Autophagic cell death was originally defined as cell death accompanied by
large-scale autophagic vacuolization of the cytoplasm. However, autophagy is a
"double-edged sword" for cancer cells as it can either promote or suppress the
survival and proliferation in the tumor microenvironment. Furthermore, several
studies of drug re-positioning suggest that "conventional" agents used to treat
diseases other than cancer can have antitumor therapeutic effects by
activating/suppressing autophagy. Because of ever increasing failure rates and
high cost associated with anticancer drug development, this therapeutic
development strategy has attracted increasing attention because the safety
profiles of these medicines are well known. Antimalarial agents such as
artemisinin and disease-modifying antirheumatic drug (DMARD) are the typical
examples of drug re-positioning which affect the autophagy regulation for the
therapeutic use. This review article focuses on recent advances in some of the
novel therapeutic strategies that target autophagy with a view to
treating/preventing malignant neoplasms.
|Apoptosis
[MESH]
|Autophagy/*drug effects
[MESH]
|Drug Repositioning/*methods
[MESH]
|Humans
[MESH]
|Neoplasms/*drug therapy/prevention & control
[MESH]