Betulinic acid, a natural cytotoxic agent, fails to trigger apoptosis in human Burkitt's lymphoma-derived B-cell lines.

Abstract

Betulinic acid (BA), a pentacyclic triterpene of natural origin, effectively induces apoptosis in neuroectodermal tumors and was recently shown to be a potent trigger of cell death in human leukemia-derived cell lines. To explore the potential of BA in the treatment of hematologic malignancies, we tested a panel of 10 Burkitt's lymphoma (BL)-derived B-cell lines for sensitivity to BA. The human Jurkat T leukemia cell line was included as a positive control. Our studies show that BA exerts cytotoxic effects in some of the BL cell lines tested, including DG75, a chemoresistant BL cell line. However, cell death was caspase-independent, as evidenced by a lack of protection by zVAD-fmk, a pancaspase inhibitor, and displayed signs of necrosis. Furthermore, BA-induced caspase activation was seen to a minor extent in only 1 of the 10 BL cell lines tested (Ramos, a p53-deficient cell line), but was readily detected in Jurkat cells. Together, these studies indicate that resistance to BA-induced apoptosis is a common feature of BL-derived cell lines.

• Authors: Maria B Karpova, Duangmanee Sanmun, Jan-Inge Henter, Aleksandr F Smirnov, Bengt Fadeel
• Journal: International journal of cancer (Int J Cancer) Vol. 118 Issue 1 Pg. 246-52 (Jan 01 2006) ISSN: 0020-7136 [Print] United States
• PMID: 16003746 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright 2005 Wiley-Liss, Inc.

Chemical References

• Antineoplastic Agents, Phytogenic
• Pentacyclic Triterpenes
• Triterpenes
• Caspases
• Betulinic Acid

Topics

• Antineoplastic Agents, Phytogenic (pharmacology)
• Apoptosis (drug effects)
• Burkitt Lymphoma (pathology)
• Caspases (metabolism)
• Drug Resistance, Neoplasm
• Drug Screening Assays, Antitumor
• Genes, p53
• Humans
• Jurkat Cells
• Lymphoma, B-Cell (pathology)
• Pentacyclic Triterpenes
• Triterpenes (pharmacology)
• Tumor Cells, Cultured
• Betulinic Acid