Overexpression of pyruvate dehydrogenase kinase 3 increases drug resistance and early recurrence in colon cancer

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)

Abstract

The switch of cellular metabolism from mitochondrial respiration to glycolysis is the hallmark of cancer cells and is associated with tumor malignancy. Pyruvate dehydrogenase kinase-1 (PDK1) and PDK3 participate in the metabolic switch of cancer cells; however, the medical significance of PDK1 and PDK3 in cancer progression is not known. Here, we assessed the expression profiles of PDK1 and PDK3 in colorectal cancer. Western blot analysis (n = 74) demonstrated that PDK3 was markedly increased in colon cancer compared to that in adjacent normal tissues, whereas PDK1 was decreased in cancer cells. In addition, PDK3 expression was positively correlated with that of hypoxia inducible factor-1α (HIF-1α) in cancer cells. Further analysis using immunohistochemical staining revealed that PDK3 levels were positively associated with severity of cancer and negatively associated with disease-free survival. In vitro studies using several colon cancer cell lines showed that PDK3 expression was controlled by HIF-1α and contributed to hypoxia-induced increased drug resistance, perhaps explaining why patients with PDK3 overexpression have a greater incidence of treatment failure. Taken together, our findings suggest that PDK3 plays an important role in the metabolic switch and drug resistance of colon cancer and is potentially a novel target for cancer therapy.

Original languageEnglish
Pages (from-to)1405-1414
Number of pages10
JournalAmerican Journal of Pathology
Volume179
Issue number3
DOIs
Publication statusPublished - 2011 Sep

All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine

Fingerprint Dive into the research topics of 'Overexpression of pyruvate dehydrogenase kinase 3 increases drug resistance and early recurrence in colon cancer'. Together they form a unique fingerprint.

Cite this