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Steroidal saponins from Dioscorea preussii.

Turibio Kuiate Tabopda1, Anne-Claire Mitaine-Offer2, Chiaki Tanaka3

  • 1EA 4267 (FDE/UFC), Laboratoire de Pharmacognosie, Faculté de Pharmacie, Université de Bourgogne, 7, Bd. Jeanne d'Arc, BP 87900, 21079 Dijon CEDEX, France; Département de Chimie Organique, Université de Yaoundé 1, BP 812, Yaoundé, Cameroun.

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|June 15, 2014
PubMed
Summary

Three new steroidal saponins, diospreussinosides A-C, were isolated from Dioscorea preussii rhizomes. These compounds, along with two known ones, were evaluated for their cytotoxic effects on human colon carcinoma cell lines.

Keywords:
CytotoxicityDioscorea preussiiDioscoreaceaeNMRSteroid saponins

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Area of Science:

  • Phytochemistry
  • Natural Products Chemistry
  • Pharmacology

Background:

  • Dioscorea preussii is a plant species known to contain various bioactive compounds.
  • Steroidal saponins are a class of natural products with diverse pharmacological activities.
  • Understanding the chemical constituents of medicinal plants is crucial for drug discovery.

Purpose of the Study:

  • To isolate and characterize new steroidal saponins from Dioscorea preussii rhizomes.
  • To investigate the cytotoxic potential of isolated compounds against human colon carcinoma cell lines.

Main Methods:

  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation through comprehensive spectroscopic analyses (1D and 2D NMR, Mass Spectrometry).
  • Cytotoxicity assays using HT-29 and HCT 116 human colon carcinoma cell lines.

Main Results:

  • Three new steroidal saponins, diospreussinosides A-C (1-3), were identified.
  • Two known steroidal saponins (4, 5) were also isolated.
  • Compound 3 exhibits a novel spirostane-type skeleton with unusual F-ring dihydroxylation.
  • Compounds 2-5 demonstrated varying degrees of cytotoxicity against HT-29 and HCT 116 cells.

Conclusions:

  • Dioscorea preussii is a source of novel steroidal saponins with unique structural features.
  • The isolated compounds, particularly those with cytotoxic activity, warrant further investigation for potential anti-cancer applications.
  • The identification of a new dihydroxylation pattern in compound 3 expands the known structural diversity of spirostane saponins.