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Two new macrolide sesquiterpene pyridine alkaloids from Maytenus emarginata: emarginatine G and the cytotoxic emarginatine F.

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Two new macrolide sesquiterpene pyridine alkaloids, emarginatine F [1] and emarginatine G [2], were isolated from Maytenus emarginata. The structural determinations of 1 and 2 by 2D nmr techniques and spectral comparison with a related compound, emarginatine A [3], are discussed. Biological

Two sesquiterpene pyridine alkaloids and a triterpenoid saponin from the root barks of Tripterygium hypoglaucum.

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Two new sesquiterpene pyridine alkaloids hypoglaunines E (1) and F (2) and a new triterpenoid saponin hypoglaside A (3), together with a known diterpenoid glucoside11-O-β-D-glucopyranosyl neotriptophenolide (4) and two known triterpenoids 23-noroxopristimerol(5) and 2,3-dihydroxy-6-oxo-D:A-froedo-24

Wilforine Resensitizes Multidrug Resistant Cancer Cells via Competitive Inhibition of P-glycoprotein

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Background and purpose: Multidrug resistance (MDR) remains the main obstacle in cancer treatment and overexpression of P-glycoprotein (P-gp) is one of the most common causes of chemoresistance. The development of novel P-gp inhibitors from natural products is a

Piperlongumine chemosensitizes tumor cells through interaction with cysteine 179 of IκBα kinase, leading to suppression of NF-κB-regulated gene products.

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Recently, two different reports appeared in prominent journals suggesting a mechanism by which piperlongumine, a pyridine alkaloid, mediates anticancer effects. In the current report, we describe another novel mechanism by which this alkaloid mediates its anticancer effects. We found that

Three New Pyridine Alkaloids from Vinca major Cultivated in Pakistan.

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Three new pyridine type alkaloids, (-)-vinmajpyridines A-C (1-3), along with two known alkaloids, have been isolated from the aerial parts of Vinca major cultivated in Pakistan. Their structures have been elucidated by means of NMR and HRESIMS spectroscopic data. The new alkaloids were evaluated for

Chemical constituents from the roots of Tripterygium wilfordii and their cytotoxic activity.

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In our ongoing search for bioactive constituents, a new sesquiterpene polyol ester, named triptersinine U (1), together with five known triterpenes (2-6) and seven sesquiterpene pyridine alkaloids (7-13), were isolated from the roots of Tripterygium wilfordii Hook. f. Their chemical structures were

In vitro testing of the responses of human gingival fibroblasts and L-929 cells to nicotine.

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Tobacco smoke is considered to be a major risk factor in the development of cardiac diseases and lung cancer. It has also been shown that periodontitis is more prevalent and more severe in smokers than in non-smokers. Nicotine, the major pyridine alkaloid in tobacco, has been shown to participate in

Antitumor agents. 228. five new agarofurans, Reissantins A-E, and cytotoxic principles from Reissantia buchananii.

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Twenty-one compounds, including five new agarofuran sesquiterpenes, reissantins A-E (1-5), were isolated from Reissantia buchananii by means of bioassay-directed fractionation and their structures identified from spectral data. Reissantins A-C are the first reported simple agarofuran sesquiterpenes

Anti-inflammatory sesquiterpene derivatives from the leaves of Tripterygium wilfordii.

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Twelve new dihydroagarofuran sesquiterpene polyol esters, triptersinines A-L (1-12), and eight known sesquiterpene pyridine alkaloids were isolated from the leaves of Tripterygium wilfordii. Their structures were elucidated on the basis of spectroscopic analyses, including UV, IR, and NMR

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