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Record number 495103
Title SIRT1/PGC1a-dependent increase in oxidative phosphorylation supports chemotherapy resistance of colon cancer
Author(s) Vellinga, T.T.; Borovski, T.; Boer, V.C.J. de; Kranenburg, O.
Source Clinical Cancer Research 21 (2015)12. - ISSN 1078-0432 - p. 2870 - 2879.
DOI https://doi.org/10.1158/1078-0432.CCR-14-2290
Department(s) Human and Animal Physiology
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) oxidative phosphorylation - chemotherapy resistance - colon cancer
Abstract PURPOSE:
Chemotherapy treatment of metastatic colon cancer ultimately fails due to development of drug resistance. Identification of chemotherapy-induced changes in tumor biology may provide insight into drug resistance mechanisms.
EXPERIMENTAL DESIGN:
We studied gene expression differences between groups of liver metastases that were exposed to preoperative chemotherapy or not. Multiple patient-derived colonosphere cultures were used to assess how chemotherapy alters energy metabolism by measuring mitochondrial biomass, oxygen consumption, and lactate production. Genetically manipulated colonosphere-initiated tumors were used to assess how altered energy metabolism affects chemotherapy efficacy.
RESULTS:
Gene ontology and pathway enrichment analysis revealed significant upregulation of genes involved in oxidative phosphorylation (OXPHOS) and mitochondrial biogenesis in metastases that were exposed to chemotherapy. This suggested chemotherapy induces a shift in tumor metabolism from glycolysis towards OXPHOS. Indeed, chemotreatment of patient-derived colonosphere cultures resulted in an increase of mitochondrial biomass, increased expression of respiratory chain enzymes, and higher rates of oxygen consumption. This was mediated by the histone deacetylase sirtuin-1 (SIRT1) and its substrate, the transcriptional coactivator PGC1α. Knockdown of SIRT1 or PGC1α prevented chemotherapy-induced OXPHOS and significantly sensitized patient-derived colonospheres as well as tumor xenografts to chemotherapy.
CONCLUSIONS:
Chemotherapy of colorectal tumors induces a SIRT1/PGC1α-dependent increase in OXPHOS that promotes tumor survival during treatment. This phenomenon is also observed in chemotherapy-exposed resected liver metastases, strongly suggesting that chemotherapy induces long-lasting changes in tumor metabolism that potentially interfere with drug efficacy. In conclusion, we propose a novel mechanism of chemotherapy resistance that may be clinically relevant and therapeutically exploitable.
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