TRAP1 regulates proliferation, mitochondrial function, and has prognostic significance in NSCLC

Jackeline Agorreta, Jianting Hu, Dongxia Liu, Domenico Delia, Helen Turley, David J P Ferguson, Francisco Iborra, María J. Pajares, Marta Larrayoz, Isabel Zudaire, Ruben Pio, Luis M. Montuenga, Adrian L. Harris, Kevin Gatter, Francesco Pezzella

Research output: Contribution to journalArticlepeer-review

Abstract

The TNF receptor-associated protein 1 (TRAP1) is a mitochondrial HSP that has been related to drug resistance and protection from apoptosis in colorectal and prostate cancer. Here, the effect of TRAP1 ablation on cell proliferation, survival, apoptosis, and mitochondrial function was determined in non-small cell lung cancer (NSCLC). In addition, the prognostic value of TRAP1 was evaluated in patients with NSCLC. These results demonstrate that TRAP1 knockdown reduces cell growth and clonogenic cell survival. Moreover, TRAP1 downregulation impairs mitochondrial functions such as ATP production and mitochondrial membrane potential as measured byTMRM(tetramethylrhodamine methylester) uptake, but it does not affect mitochondrial density or mitochondrial morphology. The effect of TRAP1 silencing on apoptosis, analyzed by flow cytometry and immunoblot expression (cleaved PARP, caspase-9, and caspase-3) was cell line and context dependent. Finally, the prognostic potential of TRAP1 expression in NSCLC was ascertained via immunohistochemical analysis which revealed that high TRAP1 expression was associated with increased risk of disease recurrence (univariate analysis, P = 0.008; multivariate analysis, HR: 2.554; 95% confidence interval, 1.085-6.012; P = 0.03). In conclusion, these results demonstrate that TRAP1 impacts the viability of NSCLC cells, and that its expression is prognostic in NSCLC.

Original languageEnglish
Pages (from-to)660-669
Number of pages10
JournalMolecular Cancer Research
Volume12
Issue number5
DOIs
Publication statusPublished - 2014

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Oncology
  • Medicine(all)

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