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The effect of Amaryllidaceae alkaloids haemanthamine and haemanthidine on cell cycle progression and apoptosis in p53-negative human leukemic Jurkat cells.

Abstract
Plants from the Amaryllidaceae family have been shown to be a promising source of biologically active natural compounds of which some selected are currently in pre-clinical development. Regardless of interesting pioneer works, little is known about Amaryllidaceae alkaloids that have shown promising anti-cancer activities. The crinane group of the Amaryllidaceae, including haemanthamine and haemanthidine, was amongst the first of these compounds to exhibit an interesting cytotoxic potential against cancer cell lines. However, the mechanism of cytotoxic and anti-proliferative activity is not yet entirely clear. The primary objectives of the current study were to investigate the effects of haemanthamine and haemanthidine on the induction of apoptosis and the cell cycle regulatory pathway in p53-null Jurkat cells. Results indicate that haemanthamine and haemanthidine treatment decreases cell viability and mitochondrial membrane potential, leads to a decline in the percentage of cells in the S phase of the cell cycle, induces apoptosis detected by Annexin V staining and increases caspase activity. Dose dependent apoptosis was cross verified by fluorescence and bright field microscopy through Annexin V/propidium iodine staining and morphological changes which characteristically attend programmed cell death. The apoptotic effect of haemanthamine and haemanthidine on leukemia cells is more pronounced than that of gamma radiation. Contrary to gamma radiation, Jurkat cells do not completely halt the cell cycle 24h upon haemanthamine and haemanthidine exposure. Both Amaryllidaceae alkaloids accumulate cells preferentially at G1 and G2 stages of the cell cycle with increased p16 expression and Chk1 Ser345 phosphorylation. Concerning the pro-apoptotic effect, haemanthidine was more active than haemanthamine in the Jurkat leukemia cell line.
AuthorsRadim Havelek, Martina Seifrtova, Karel Kralovec, Lenka Bruckova, Lucie Cahlikova, Marketa Dalecka, Jirina Vavrova, Martina Rezacova, Lubomir Opletal, Zuzana Bilkova
JournalPhytomedicine : international journal of phytotherapy and phytopharmacology (Phytomedicine) Vol. 21 Issue 4 Pg. 479-90 (Mar 15 2014) ISSN: 1618-095X [Electronic] Germany
PMID24182986 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2013 Elsevier GmbH. All rights reserved.
Chemical References
  • Amaryllidaceae Alkaloids
  • Antineoplastic Agents, Phytogenic
  • Cyclin-Dependent Kinase Inhibitor p16
  • Phenanthridines
  • Plant Extracts
  • hemanthidine
  • hemanthamine
  • Protein Kinases
  • Checkpoint kinase 1
  • Caspases
Topics
  • Amaryllidaceae Alkaloids (pharmacology, therapeutic use)
  • Antineoplastic Agents, Phytogenic (analysis)
  • Apoptosis (drug effects)
  • Caspases (metabolism)
  • Cell Cycle Checkpoints (drug effects)
  • Cyclin-Dependent Kinase Inhibitor p16 (metabolism)
  • Drug Screening Assays, Antitumor
  • Genes, p53
  • Humans
  • Jurkat Cells
  • Leukemia (drug therapy)
  • Liliaceae (chemistry)
  • Membrane Potential, Mitochondrial (drug effects)
  • Phenanthridines (pharmacology, therapeutic use)
  • Phytotherapy
  • Plant Extracts (pharmacology, therapeutic use)
  • Protein Kinases (metabolism)

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