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Triptolide inhibits cyclooxygenase-2 and inducible nitric oxide synthase expression in human colon cancer and

Xiangmin Tong1, Shui'er Zheng, Jie Jin

  • 1Institute of Hematologic Disease, Department of Hematology, First Affiliated Hospital, Medical School, Zhejiang University, Hangzhou 310003, China. yaohp2001@yahoo.com.cn.

Acta Biochimica Et Biophysica Sinica
|February 6, 2007
PubMed

Insights

Triptolide (TP) demonstrates significant antitumor effects by inhibiting the proliferation of colon cancer and leukemia cells. Its mechanism involves down-regulating inflammatory factors like nitric oxide (NO) and prostaglandin E2 (PGE2).

Area of Science:

  • Pharmacology and Toxicology
  • Cancer Biology
  • Immunology

Background:

  • Triptolide (TP), a compound from traditional Chinese medicine, shows promise for autoimmune diseases and possesses antineoplastic activity.
  • Existing research indicates TP's potential against various human tumor cell lines.
  • The precise molecular mechanisms underlying TP's antitumor effects require further elucidation.

Purpose of the Study:

  • To investigate the antitumor efficacy of Triptolide (TP) in human colon cancer (SW114) and myelocytic leukemia (K562) cell lines.
  • To explore the molecular mechanisms associated with TP's anti-cancer activity, focusing on inflammatory pathways.

Main Methods:

  • Human colon cancer (SW114) and myelocytic leukemia (K562) cells were treated with varying concentrations of TP (0-50 ng/ml).
  • Cell viability was assessed using the MTT assay.
  • Production of nitric oxide (NO) and prostaglandin E2 (PGE2) was quantified via ELISA; mRNA and protein expression of inducible NO synthase (iNOS) and cyclooxygenase-2 (COX-2) were analyzed using real-time RT-PCR and Western blotting.

Main Results:

  • TP significantly inhibited the proliferation of both SW114 and K562 cells in a dose-dependent manner.
  • TP markedly suppressed the production of NO and PGE2.
  • TP treatment led to the down-regulation of iNOS and COX-2 at both mRNA and protein levels.

Conclusions:

  • Triptolide exhibits potent antitumor effects against human colon cancer and leukemia cells.
  • The anti-cancer mechanism of TP is associated with the inhibition of key inflammatory mediators, specifically iNOS and COX-2.
  • TP's ability to modulate inflammatory pathways suggests its potential as a therapeutic agent for cancer treatment.

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