Euphane and Tirucallane Triterpenes with Trypanocidal Activity from .

The phytochemical investigation of resulted in the isolation of 15 previously undescribed triterpenoids (desmondiins A, C-P) and 8 already described compounds. The structures of the isolated compounds were determined by extensive spectroscopic analyses. The compounds were identified as tirucallane and euphane triterpenes based on 7-keto-8-ene, 11-keto-8-ene, or 7,11-diketo-8-ene skeletons.

New Members of the Centrapalus Coumarin and Pauciflorin Series from .

Monoterpene and 5-methylcoumarin- or 5-methylchromone-coupled meroterpenoids occurring mainly in the Asteraceae species proved to have high potency against protozoans, worms, and various tumor cells, which make them interesting targets for searching for new bioactive compounds. The African plant was applied in traditional medicine for healing chest pain and stomach aches. Three new meroterpenoids named centrapalus coumarin N (), pauciflorins P (), and Q (), and the already known cyclohoehnelia coumarin (), were isolated from the chloroform extract of , together with centrapalus coumarin O (), which was obtained for the first time from a natural source.

Anticancer Meroterpenoids from leaves: Chromone- and 2,4-Chromadione-Monoterpene Derivatives.

Eight previously undescribed chromones, named pauciflorins F-M and two 5-methyl-2,4-chromadione derivatives named as pauciflorins N and O, were isolated from the methanol extract of the leaves of (Willd.) H.Rob.

Pauciflorins A-E, Unexpected Chromone-Monoterpene-Derived Meroterpenoids from .

Five unusual meroterpenoids based on new carbon skeletons, pauciflorins A-E (-), were isolated by multistep chromatographic separations of a methanol extract of the aerial parts of . Compounds - are derived by the connection of a 2-nor-chromone and a monoterpene unit, whereas and are dihydrochromone-monoterpene adducts with a rarely occurring orthoester functionality. The structures were solved using 1D and 2D NMR, HRESIMS, and single-crystal X-ray diffraction.

Triterpenes and Phenolic Compounds from with Antiviral Activity against Herpes Simplex Virus Type-2.

Two undescribed compounds, 37-dihydroxy-24-methylenelanosta-8-ene-11-one () and neolignane deightonin () were isolated from the aerial parts of Croizat together with six known compounds, namely, kansenone (), euphorbol-7-one (), dehydrodiconiferyl diacetate (), marylaurencinol D (), scoparon (), and 3,4,3'-tri--methylellagic acid (). The structures of the isolated compounds were determined by HRESIMS, 1D (H, C JMOD) and 2D NMR (HSQC, HMBC, H-H COSY, NOESY) spectroscopic analysis, and by comparison of the assignments with literature data. The anti-herpes simplex virus type-2 activity of the isolated compounds were investigated by qRT-PCR assay on Vero cells after determining cytotoxic concentration 50% (CC).

12-Deoxyphorbol Esters Induce Growth Arrest and Apoptosis in Human Lung Cancer A549 Cells Via Activation of PKC-δ/PKD/ERK Signaling Pathway.

Prostratin, a non-tumor promoting 12-deoxyphorbol ester, has been reported as a protein kinase C (PKC) activator and is shown to have anti-proliferative activity in certain cancer cell types. Here we show that GRC-2, a prostratin analogue isolated from , is ten-fold more potent than prostratin for inhibiting the growth of human non-small cell lung cancer (NSCLC) A549 cells. Flow cytometry assay revealed that GRC-2 and prostratin inhibited cell cycle progression at the G2/M phase and induced apoptosis.

Diterpenoids from Euphorbia dulcis with Potassium Ion Channel Inhibitory Activity with Selective G Protein-Activated Inwardly Rectifying Ion Channel (GIRK) Blocking Effect.

Nine new (1-9) and two known (10, 11) jatrophane diterpenoids were isolated from the methanol extract of Euphorbia dulcis. The structure elucidation of the compounds was performed by means of extensive spectroscopic analysis, including HRESIMS, 1D (H, JMOD), and 2D (HSQC, HMBC, H-H-COSY, NOESY) NMR experiments. The absolute configuration of compound 1 was determined by single-crystal X-ray diffraction.

Pellitorine, an extract of Tetradium daniellii, is an antagonist of the ion channel TRPV1.

Background: Transient Receptor Potential Vanilloid 1 (TRPV1) confers noxious heat and inflammatory pain signals in the peripheral nervous system. Clinical trial of resiniferatoxin from Euphorbia species is successfully aimed at TRPV1 in cancer pain management and heading toward new selective painkiller status that further validates this target for drug discovery efforts. Evodia species, used in traditional medicine for hundreds of years, are a recognised source of different TRPV1 agonists, but no antagonist has yet been reported.

Isolation of Phorbol Esters from Euphorbia grandicornis and Evaluation of Protein Kinase C- and Human Platelet-Activating Effects of Euphorbiaceae Diterpenes.

Human platelets contain conventional (α and β) and novel isoforms of PKC (δ and θ), and PKC activation can result in platelet aggregation and secretion reaction that are important for thrombus formation. Several tumor-promoting Euphorbiaceae diterpenes are known to act as direct activators of PKC, but many types of such diterpenes have not been studied as platelet stimulators. In the present study, two new and five known phorbol esters were isolated from Euphorbia grandicornis.

Diterpene Constituents of Euphorbia exigua L. and Multidrug Resistance Reversing Activity of the Isolated Diterpenes.

Phytochemical investigation of the MeOH extract obtained from the aerial parts of the annual weed Euphorbia exigua L. resulted in the isolation of two novel (1, 2) and one known (3) jatrophane diterpenes. Their structures were established by extensive 1D- and 2D-NMR spectroscopy and HR-ESI-MS.

Possible role of fat tissue in the pharmacokinetics of Dodeca-2E,4E,8Z,10E/Z-tetraenoic acid isobutylamides after oral administration of Echinacea angustifolia extract in rats.

Alkamides are one of the most important constituents of lipophilic extracts of Echinacea angustifolia roots. These compounds play an important role in the versatile pharmacological actions of this plant. The present study aimed to compare the concentrations of isomeric dodeca-2E,4E,8Z,10E/Z-tetraenoic acid isobutylamides (DTAI) in brain and periepididymal fat tissues and blood plasma of rats.

Alkamides and a neolignan from Echinacea purpurea roots and the interaction of alkamides with G-protein-coupled cannabinoid receptors.

Multiple chromatographic separations of the CHCl₃-soluble extract of the roots of Echinacea purpurea led to the isolation of 19 compounds. Four natural products, three alkamides and nitidanin diisovalerianate, were identified, and five further compounds were detected for the first time in this species. Additionally, 10 known E.

Jatrophane diterpenes from Euphorbia esula as antiproliferative agents and potent chemosensitizers to overcome multidrug resistance.

Phytochemical study of whole, undried plants of Euphorbia esula led to the isolation of six new (1-6) jatrophane diterpene polyesters, named esulatins H-M, together with the known compounds 2α,3β,5α,7β,15β-pentaacetoxy-9α-nicotinoyloxyjatropha-6(17),11-dien-14-one (7), salicinolide (8), and euphosalicin (9). The structures and relative configuration of 1-6 were established on the basis of extensive spectroscopic analysis, including HRESIMS and one- and two-dimensional NMR techniques. All these compounds, together with diterpenes (10-14) isolated previously from this plant, were evaluated for their antiproliferative activity against HeLa, Ishikawa, and MCF7 cells.

Unusual tigliane diterpenes from Euphorbia grandicornis.

Phytochemical study of the aerial parts of Euphorbia grandicornis led to the isolation of two new tigliane diterpenes, 16-angeloyloxy-13α-isobutanoyloxy-4β,9α,20-trihydroxytiglia-1,5-diene-3,7-dione (1) and 16-angeloyloxy-13α-isobutanoyloxy-4β,9α,7β-trihydroxytiglia-1,5-dien-3-one (2). The structures and relative configuration of the new compounds were elucidated on the basis of extensive spectroscopic analysis, including 1D and 2D NMR experiments ((1)H NMR, JMOD, (1)H-(1)H COSY, NOESY, HSQC, and HMBC), mass spectrometry, and comparison with literature data. The biogenesis of 1 and 2 with respect to the unusual 5-en-7-one and 5-en-7-ol moieties is also discussed.

Inhibition of human cytomegalovirus IE gene expression by dihydro-beta-agarofuran sesquiterpenes isolated from Euonymus species.

The development of strategies intended to inhibit human cytomegalovirus (HCMV) immediate-early (IE) antigen expression is an important goal in research designed to prevent and treat certain forms of cancer. The aim of this study was to identify potent IE antigen-targeting natural compounds as antitumor promoters in an in vitro model of tumor promotion. Nineteen dihydro-beta-agarofuran sesquiterpenes isolated from Euonymus species were evaluated for their ability to inhibit HCMV IE antigen expression in human lung adenocarcinoma (A549) cells.

Chemoprevention and inhibition of P-glycoprotein in cancer cells by Chinese medicinal herbs.

Many of the herbal extracts used in the Chinese clinical medical routine inhibit the growth of tumor cells. In the present work, extracts of 12 selected herbs were prepared with methanol, chloroform, ethyl acetate and water, and the effects of these on the multidrug resistance (MDR) and P-glycoprotein of mouse lymphoma cells transfected with the human mdr1 gene and on a human lung alveolar epithelial cell line were investigated. The extracts were tested for antiproliferative effects, and the reversal of MDR in mouse lymphoma cells.

[Chemical diversity of the biological active ingredients of salvia officinalis and some closely related species].

Comparative studies on the volatile and non-volatile fractions of 6 species. i.e.

Diterpenes from the aerial parts of Salvia candelabrum and their protective effects against lipid peroxidation.

A methanolic extract of the aerial parts of Salvia candelabrum was subjected to multiple chromatographic separation under the guidance of anti-lipid peroxidation assay. From the most active fractions seven abietane and seco-abietane diterpenes were isolated by preparative TLC purification. Besides candesalvoquinone, candelabroquinone, 12- O-methylcandesalvone B, candesalvone B methyl ester and candelabrone (all reported earlier), the known candesalvone B and the new candesalvolactone were identified.

Jatrophane diterpenoids from Euphorbia mongolica as modulators of the multidrug resistance of L5128 mouse lymphoma cells.

The dried aerial parts of Euphorbia mongolica afforded three new acylated polyhydroxy diterpenoids based on the jatrophane framework. The structures were established by means of a combination of 1D and 2D NMR techniques and mass spectrometry as (2S,3S,4R,5R,7S,8R,13S,15R)-5alpha,7beta,8alpha-triacetoxy-3beta-benzoyloxy-15beta-hydroxyjatropha-6(17),11E-diene-9,14-dione (1), (2S,3S,4R,5R,7S,8S,9S13S,15R)-5alpha,7beta,8alpha,9alpha,15beta-pentaacetoxy-3beta-benzoyloxyjatropha-6(17),11E-dien-14-one (2), and (2S,3S,4R,5R,7S,8S,9S13S,15R)-3beta,7beta,8alpha,9alpha,15beta-pentaacetoxy-5alpha-benzoyloxyjatropha-6(17),11E-dien-14-one (3). When the isolates were assayed for multidrug resistance-reversing activity in a rhodamine 123 exclusion test using L5178 mouse lymphoma cells, all compounds demonstrated a concentration-dependent effect in inhibiting the efflux pump activity of these tumor cells in the range 11.