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Cytotoxicity of small peptides of misletoes in the familiy Loranthaceae, Santalales
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry, Division of Pharmacognosy.
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URN: urn:nbn:se:uu:diva-92806OAI: oai:DiVA.org:uu-92806DiVA: diva2:166104
Available from: 2005-04-01 Created: 2005-04-01 Last updated: 2012-03-14
In thesis
1. Cytotoxic Compounds of Plant Origin – Biological and Chemical Diversity
Open this publication in new window or tab >>Cytotoxic Compounds of Plant Origin – Biological and Chemical Diversity
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Cytotoxiska föreningar från växter – biologisk och kemisk diversitet
Abstract [en]

The development of resistance by tumour cells to chemotherapeutic agents is a major problem in cancer treatments. One way to counter this is to find compounds with cytotoxic mechanisms other than those of drugs in clinical use today. The biological and chemical diversity encountered in Nature provide opportunities to discover completely new chemical classes of compounds. Some of these may represent previously unknown anticancer agents, and in some cases, novel, potentially relevant cytotoxic mechanisms.

The selection of plants for the cytotoxic investigation in this project was designed to cover large parts of the angiosperm system, providing a broad representation of species. Extracts of the plants were subjected to a polypeptide fractionation protocol, followed by bioassay-guided isolation, yielding series of fractions with increasing purity and cytotoxicity. The cytotoxicity assay included tumour cells from patients and a cell-line panel including ten different cell lines representing several types of resistant and non-resistant tumours. This screening strategy allowed fractions and compounds acting with novel mechanisms to be detected at an early stage.

The compounds isolated represent substantial chemical diversity and originate from diverse parts of the phylogenetic spectrum examined. They include the highly potent cytotoxic alkaloid, thiobinupharidine, the structure of which was determined by NMR techniques. Furthermore, two types of compound were shown to have previously unreported cytoxic activity: cyclotides (small macrocyclic polypeptides, in this case from violets) and polypeptides, possibly of thionine type, of loranthaceaeous mistletoes (collected in Panama). The well known cardiac glycosides from the foxglove, Digitalis, were identified as being responsible for the anti-tumour activity of this species.

In conclusion, the results obtained in this project show that selection based on phylogenetic information, together with a robust and reliable method to detect cytotoxicity, can be a useful approach for exploring the plant kingdom for cytotoxic substances.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 71 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Pharmacy, ISSN 1651-6192 ; 7
Pharmacognosy, pharmacognosy, cytotoxicity, antitumour, Nuphar alkaloid, cyclotide, thionin, cardiac glycoside, Farmakognosi
National Category
Pharmaceutical Sciences
urn:nbn:se:uu:diva-5728 (URN)91-554-6197-2 (ISBN)
Public defence
2005-04-22, Room C8:301, BMC, Husargatan 1, Uppsala, 09:15
Available from: 2005-04-01 Created: 2005-04-01Bibliographically approved

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