Bone morphogenetic protein-4 inhibits heat-induced apoptosis by modulating MAPK pathways in human colon cancer HCT116 cells

Haiyun Deng, T. S. Ravikumar, Weng Lang Yang

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Cancer thermotherapy and radiofrequency ablation (RFA) have been adopted as modalities for treating various kinds of cancer. We have previously demonstrated that bone morphogenetic protein-4 (BMP-4) is up-regulated in colonic adenocarcinoma. Here, we investigated whether an increase of BMP-4 expression changes cellular response to heat treatment in human colon cancer HCT116 cells. BMP-4 overexpressing HCT116 cells generated by stable transfection showed a significantly increased survival rate and a decreased apoptotic rate in comparison to empty vector controls after heat treatment at 45 °C for 20 min. The expression levels and pattern of HSP90, HSP70, and HSP27 after heat treatment were similar between these two cell lines. There was no difference in expression levels of Bcl-2 and Bax in these two cell lines and their expression remained unchanged after heat treatment. Both activities of the extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) were stimulated by heat in these cells. Comparatively, BMP-4 overexpressing cells had an intense and prolonged ERK activation, while a less intense and short JNK activation. Correspondingly, treatment of BMP-4 overexpressing cells with noggin, a BMP-4 antagonist, resulted in a reduction of heat-activated ERK but an increase of heat-activated JNK and significantly increased heat-induced apoptotic rate. These results indicate that BMP-4 can protect colon cancer cells from heat-induced apoptosis through enhancing the activation of ERK as well as inhibiting the activation of JNK.

Original languageEnglish (US)
Pages (from-to)207-217
Number of pages11
JournalCancer Letters
Volume256
Issue number2
DOIs
StatePublished - Oct 28 2007
Externally publishedYes

Keywords

  • Apoptosis
  • BMP-4
  • Colon cancer
  • Hyperthermia
  • MAPK pathway

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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