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2015 ; 5
(ä): 121
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STAT3-Mediated Metabolic Reprograming in Cellular Transformation and Implications
for Drug Resistance
#MMPMID26106584
Poli V
; Camporeale A
Front Oncol
2015[]; 5
(ä): 121
PMID26106584
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Signal transducer and activator of transcription (STAT)3 mediates the signaling
downstream of cytokine and growth factor receptors, regulating the expression of
target genes. It is constitutively phosphorylated on tyrosine (Y-P) in many
tumors, where its transcriptional activity can induce a metabolic switch toward
aerobic glycolysis and down-regulate mitochondrial activity, a prominent
metabolic feature of most cancer cells, correlating with reduced production of
ROS, delayed senescence, and protection from apoptosis. STAT3 can, however, also
localize to mitochondria, where its serine-phosphorylated (S-P) form preserves
mitochondrial oxidative phosphorylation and controls the opening of the
mitochondrial permeability transition pore, also promoting survival and
resistance to apoptosis in response to specific signals/oncogenes such as RAS.
Thus, downstream of different signals, both nuclear, Y-P STAT3, and
mitochondrial, S-P STAT3, can act by promoting cell survival and reducing ROS
production. Here, we discuss these properties in the light of potential
connections between STAT3-driven alterations of mitochondrial metabolism and the
development of drug resistance in cancer patients.