Inhibition of CaMKII-mediated c-FLIP expression sensitizes malignant melanoma cells to TRAIL-induced apoptosis

Chang Xiao, Bao Feng Yang, Jin H. Song, Howard Schulman, Liang Li, Chunhai Hao

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

TRAIL can induce apoptosis in melanoma cells and thus may offer new hope for melanoma therapy. However, many melanoma cells are resistant to TRAIL. To examine molecular mechanisms in cell resistance, we analyzed TRAIL-induced DISC in TRAIL-sensitive melanoma cells and showed that apoptosis-initiating caspase-8 and caspase-10 were recruited to the DISC where they became activated through autocatalytical cleavage, leading to apoptosis through cleavage of downstream substrates such as caspase-3 and DFF45. In TRAIL-resistant melanoma cells, however, c-FLIP proteins were recruited to the DISC, resulting in the inhibition of caspase-8 and caspase-10 cleavage in the DISC. Both calmodulin-dependent protein kinase II (CaMKII) protein and enzymatic activity were upregulated in resistant cells and CaMKII inhibitor KN-93 downregulated expression of c-FLIP proteins, thus sensitizing resistant cells to TRAIL-induced apoptosis. Transfection of CaMKII cDNA in sensitive melanoma cells resulted in cell resistance to TRAIL, where transfection of CaMKII dominant-negative cDNA in resistant cells restored TRAIL sensitivity in cells. These results indicate that the CaMKII-mediated pathway for c-FLIP upregulation protects melanoma cells from TRAIL-induced apoptosis and targeting this pathway may provide novel therapeutic strategies in treatment of melanomas.

Original languageEnglish (US)
Pages (from-to)244-255
Number of pages12
JournalExperimental Cell Research
Volume304
Issue number1
DOIs
StatePublished - Mar 10 2005
Externally publishedYes

Fingerprint

Calcium-Calmodulin-Dependent Protein Kinase Type 2
Melanoma
Apoptosis
Caspase 10
Caspase 8
Transfection
Complementary DNA
Proteins
Protein Kinase Inhibitors
Caspase 3
Up-Regulation
Down-Regulation

Keywords

  • Apoptosis
  • c-FLIP
  • CaMKII
  • DISC
  • Melanoma
  • TRAIL

ASJC Scopus subject areas

  • Cell Biology

Cite this

Inhibition of CaMKII-mediated c-FLIP expression sensitizes malignant melanoma cells to TRAIL-induced apoptosis. / Xiao, Chang; Yang, Bao Feng; Song, Jin H.; Schulman, Howard; Li, Liang; Hao, Chunhai.

In: Experimental Cell Research, Vol. 304, No. 1, 10.03.2005, p. 244-255.

Research output: Contribution to journalArticle

Xiao, Chang ; Yang, Bao Feng ; Song, Jin H. ; Schulman, Howard ; Li, Liang ; Hao, Chunhai. / Inhibition of CaMKII-mediated c-FLIP expression sensitizes malignant melanoma cells to TRAIL-induced apoptosis. In: Experimental Cell Research. 2005 ; Vol. 304, No. 1. pp. 244-255.
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