TY  - THES
A1  - Glaser, Jan
T1  - Antileishmanial compounds from Nature - Elucidation of the active principles of an extract from Valeriana wallichii rhizomes
T1  - Antileishmaniale Wirkstoffe aus der Natur - Aufklärung des Wirkprinzips eines Wurzelextraktes von Valeriana wallichii
N2  - This study is dealing with the bioactivity-guided fractionation of a chloroform extract from pulverized rhizomes of Valeriana wallichii with focus on isolation and structure elucidation of the antileishmanial active principles.
N2  - Die vorliegende Studie beschäftigt sich mit der bioaktivitätsgeleiteten Fraktionierung eines Chloroformextraktes aus pulverisierten Rhizomen von Valeriana wallichii mit Schwerpunkt auf der Isolierung und Strukturaufklärung des antileishmanialen Wirkprinzips.
KW  - Leishmaniose
KW  - Valeriana wallichii
KW  - Extrakt
KW  - Rhizom
KW  - Naturstoff
KW  - natural products
KW  - antileishmanial
KW  - Valeriana wallichii
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-129140
ER  - 
TY  - JOUR
A1  - Glaser, Jan
A1  - Schultheis, Martina
A1  - Hazra, Sudipta
A1  - Hazra, Banazri
A1  - Moll, Heidrun
A1  - Schurigt, Uta
A1  - Holzgrabe, Ulrike
T1  - Antileishmanial Lead Structures from Nature: Analysis of Structure-Activity Relationships of a Compound Library Derived from Caffeic Acid Bornyl Ester
N2  - Bioassay-guided fractionation of a chloroform extract of Valeriana wallichii (V. wallichii) rhizomes lead to the isolation and identification of caffeic acid bornyl ester (1) as the active component against Leishmania major (L. major) promastigotes (IC50 = 48.8 µM). To investigate the structure-activity relationship (SAR), a library of compounds based on 1 was synthesized and tested in vitro against L. major and L. donovani promastigotes, and L. major amastigotes. Cytotoxicity was determined using a murine J774.1 cell line and bone marrow derived macrophages (BMDM). Some compounds showed antileishmanial activity in the concentration range of pentamidine and miltefosine which are the standard drugs in use. In the L. major amastigote assay compounds 15, 19 and 20 showed good activity with relatively low cytotoxicity against BMDM, resulting in acceptable selectivity indices. Molecules with adjacent phenolic hydroxyl groups exhibited elevated cytotoxicity against murine cell lines J774.1 and BMDM. The Michael system seems not to be essential for antileishmanial activity. Based on the results compound 27 can be regarded as new lead structure for further structure optimization
KW  - Valeriana wallichii
KW  - leishmaniasis
KW  - caffeic acid bornyl ester
KW  - structure-activity relationship
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-112835
ER  -