Quantitative analysis of expression levels of bax, bcl-2, and survivin in cancer cells during cisplatin treatment

Oncol Rep. 2002 Sep-Oct;9(5):1121-6.

Abstract

Cisplatin (CDDP) exerts significant activity against a wide variety of human malignancies. However, sensitivity to CDDP differs among cancer cells. CDDP induces apoptosis in cancer cells. In the present study, to evaluate good markers of chemo-sensitivity or chemo-resistance of cancer cells, the correlation between occurrence of apoptosis and the changes in expression levels of messenger RNA (mRNA) of three genes (bax, bcl-2, and survivin) in cancer cell lines during CDDP treatment were investigated. Cells (MKN-45, LoVo, and PANC-1) were incubated with CDDP (10 microg/ml). The percentage of cells in sub-G1 fraction was measured by flow cytometry. The changes in expression levels of three genes (bax, bcl-2, and survivin) during CDDP treatment were evaluated by real-time reverse transcriptase-polymerase chain reaction (RT-PCR). The percentage of cells in sub-G1 fraction increased after a shorter incubation with CDDP in LoVo cells and also increased between 12 and 24 h CDDP treatment in MKN-45 cells. On the other hand, even with a 24 h incubation with CDDP, the percentage of cells in sub-G1 fraction did not change in PANC-1 cells. The expression level of bax mRNA significantly increased after 24 h treatment with CDDP in MKN-45 cells and it significantly increased after 12 h treatment with CDDP in LoVo cells. Also, in LoVo cells, the expression level of bcl-2 mRNA decreased after 24 h treatment with CDDP. On the other hand, during CDDP treatment, the expression levels of bcl-2 and survivin mRNA significantly increased in PANC-1 cells. These findings indicate that during chemotherapy, changes in expression levels of bax, bcl-2, and survivin may provide information about chemo-sensitivity or the chemo-resistance of tumors.

MeSH terms

  • Antineoplastic Agents / therapeutic use*
  • Apoptosis
  • Cisplatin / therapeutic use*
  • DNA, Complementary / metabolism
  • Drug Resistance, Neoplasm
  • Humans
  • Inhibitor of Apoptosis Proteins
  • Microtubule-Associated Proteins / biosynthesis*
  • Neoplasm Proteins
  • Neoplasms / drug therapy*
  • Neoplasms / metabolism*
  • Proto-Oncogene Proteins / biosynthesis*
  • Proto-Oncogene Proteins c-bcl-2 / biosynthesis*
  • RNA, Messenger / metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Survivin
  • Time Factors
  • Tumor Cells, Cultured
  • bcl-2-Associated X Protein

Substances

  • Antineoplastic Agents
  • BAX protein, human
  • BIRC5 protein, human
  • DNA, Complementary
  • Inhibitor of Apoptosis Proteins
  • Microtubule-Associated Proteins
  • Neoplasm Proteins
  • Proto-Oncogene Proteins
  • Proto-Oncogene Proteins c-bcl-2
  • RNA, Messenger
  • Survivin
  • bcl-2-Associated X Protein
  • Cisplatin