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Planta Med 2016; 82(11/12): 992-999
DOI: 10.1055/s-0042-107675
Biological and Pharmacological Activity
Original Papers
Georg Thieme Verlag KG Stuttgart · New York

Pregnane Glycosides from Cynanchum marnierianum Stimulate GLP-1 Secretion in STC-1 Cells[*]

Michail Tsoukalas
1   Laboratory of Pharmacognosy and Bioactive Natural Products, UMR 7200, University of Strasbourg, Illkirch Graffenstaden, France
,
Christian D. Muller
1   Laboratory of Pharmacognosy and Bioactive Natural Products, UMR 7200, University of Strasbourg, Illkirch Graffenstaden, France
2   CAMBA, UMR 7178, Institut Pluridisciplinaire Hubert Curien, University of Strasbourg, Illkirch Graffenstaden, France
,
Annelise Lobstein
1   Laboratory of Pharmacognosy and Bioactive Natural Products, UMR 7200, University of Strasbourg, Illkirch Graffenstaden, France
,
Aurélie Urbain
1   Laboratory of Pharmacognosy and Bioactive Natural Products, UMR 7200, University of Strasbourg, Illkirch Graffenstaden, France
› Institutsangaben
Weitere Informationen

Publikationsverlauf

received 26. Februar 2016
revised 15. April 2016

accepted 17. April 2016

Publikationsdatum:
25. Mai 2016 (online)

   Lizenzen und Reprints

Abstract

In the framework of the search for natural glucagon-like peptide-1 secretagogues, the bioassay-guided fractionation of the ethanolic extract from Cynanchum marnierianum led to the isolation of two new pregnane glycosides named marnieranosides A (1) and B (2). The structures were determined based on spectroscopic data and were established as 12β,20 S-O-dibenzoyl-pregn-6-en-5α,8β,14β,17β-tetraol-3-O-β-D-oleandropyranosyl-(1 → 4)-β-D-cymaropyranoside (1) and 12β,20R-O-dibenzoyl-pregn-6-en-5α,8β,14β-triol-3-O-β-D-oleandropyranosyl-(1 → 4)-β-D-canaropyranosyl-(1 → 4)-β-D-cymaropyranoside (2). They present structural analogies to pregnanes previously described in species known for their appetite suppressant and antihyperglycemic effects, such as P57 from Hoodia gordonii. Lupeol (3), a known dipeptidyl peptidase-4 inhibitor, and the insulinomimetic kaempferol-3-O-neohesperidoside (4) were also identified in C. marnierianum. In an in vitro assay on secretin tumor cell line-1 cells, compounds 1, 2, and P57 were found to stimulate the secretion of GLP-1 by 130 % (all tested at 100 µM). These results suggest that C. marnierianum could be of great interest in the treatment of type 2 diabetes, and that pregnane derivatives should be partly responsible via the stimulation of glucagon-like peptide-1 secretion.

Key words

Cynanchum marnierianum - Apocynaceae - marnieranosides - pregnanes - GLP-1 - cytotoxicity

* Dedicated to Professor Dr. Dr. h. c. mult. Kurt Hostettmann in recognition of his outstanding contribution to natural product research.


 

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