HIF-1α activation under glucose deprivation plays a central role in the acquisition of anti-apoptosis in human colon cancer cells

  • Authors:
    • Arata Nishimoto
    • Naruji Kugimiya
    • Tohru Hosoyama
    • Tadahiko Enoki
    • Tao-Sheng Li
    • Kimikazu Hamano
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  • Published online on: April 3, 2014     https://doi.org/10.3892/ijo.2014.2367
  • Pages: 2077-2084
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Abstract

A poor vascular network development in a tumor mass leads to poor oxygen and nutrient supply. To adapt to a hypoxic microenvironment, it is well-known that cancer cells activate the transcription factor hypoxia-inducible factor-1α (HIF-1α). HIF-1α plays a central role in hypoxia-induced metabolic switching, anti-apoptosis, angiogenesis and drug resistance. Glucose deprivation, another major stressful microenvironment, protects cancer cells from drug-induced apoptosis. However, the molecular mechanisms by which cancer cells adapt to poor nutrient conditions remain poorly understood. In this study, we focused on HIF-1α, signal transducer and activator of transcription 3 (STAT3) and trans­cription factor 4 (TCF4), which are involved in cell survival, anti-apoptosis and drug resistance. We examined their activities and the relationships among these transcription factors under glucose deprivation. Our results showed that glucose deprivation increased HIF-1α, STAT3 and TCF4 DNA-binding activity, as well as the expression levels of their target genes OCT4, BCL-2 and VEGF. HIF-1α knockdown significantly increased poly(ADP-ribose) polymerase 1 (PARP-1) cleavage at higher levels than STAT3 knockdown under glucose deprivation. Furthermore, HIF-1α knockdown led to a significant decrease in the expression levels of both STAT3 and TCF4, although STAT3 knockdown decreased only HIF-1α expression level. Our data indicated that activation of the HIF-1α signaling pathway under glucose deprivation leads to the acquisition of anti-apoptotic properties in human colon cancer cells, and targeting the HIF-1α signaling pathway may provide an effective avenue for treating cancers resistant to conventional therapy.
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June-2014
Volume 44 Issue 6

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Nishimoto A, Kugimiya N, Hosoyama T, Enoki T, Li T and Hamano K: HIF-1α activation under glucose deprivation plays a central role in the acquisition of anti-apoptosis in human colon cancer cells. Int J Oncol 44: 2077-2084, 2014.
APA
Nishimoto, A., Kugimiya, N., Hosoyama, T., Enoki, T., Li, T., & Hamano, K. (2014). HIF-1α activation under glucose deprivation plays a central role in the acquisition of anti-apoptosis in human colon cancer cells. International Journal of Oncology, 44, 2077-2084. https://doi.org/10.3892/ijo.2014.2367
MLA
Nishimoto, A., Kugimiya, N., Hosoyama, T., Enoki, T., Li, T., Hamano, K."HIF-1α activation under glucose deprivation plays a central role in the acquisition of anti-apoptosis in human colon cancer cells". International Journal of Oncology 44.6 (2014): 2077-2084.
Chicago
Nishimoto, A., Kugimiya, N., Hosoyama, T., Enoki, T., Li, T., Hamano, K."HIF-1α activation under glucose deprivation plays a central role in the acquisition of anti-apoptosis in human colon cancer cells". International Journal of Oncology 44, no. 6 (2014): 2077-2084. https://doi.org/10.3892/ijo.2014.2367