Nigella sativa seed extracts enhance glucose-induced insulin release from rat-isolated Langerhans islets.

Nigella sativa L. 'Black cumin' (Ranunculaceae) is one of the plants commonly used in Moroccan folk medicine for treatment of various ailments including diabetes mellitus. The present study was undertaken to investigate the effect of different N.

Antiplasmodial and antifungal activities of iridal, a plant triterpenoid.

Iridal, a triterpenoidic compound extracted from Iris germanica L., was previously shown to have an interesting activity on two cultured human tumor cell lines (A2780 and K562). In the present work, this same product was tested in vitro on Plasmodium falciparum chloroquine-resistant and -sensitive strains, in vivo on P.

Cytotoxicity of iridals, triterpenoids from Iris, on human tumor cell lines A2780 and K562.

Six different triterpenoids (known iridals) extracted from Iris germanica L. were purified and bioassayed on two cultured human tumor cell lines: A2780 and K562 (and for each one a drug-sensitive and a drug-resistant cell line). All of the tested iridals had an IC50 in the 0.

Insulinotropic effect of Citrullus colocynthis fruit extracts.

Infusions of Citrullus colocynthis Schrad. (Cucurbitaceae) fruits are traditionally used as antidiabetic medication in Mediterranean countries, but to our knowledge no studies have been undertaken so far to determine the possible mechanisms involved in the antidiabetic properties of the fruit. The present study was designed to investigate whether these fruits possess insulinotropic effects.

4-Hydroxyisoleucine: effects of synthetic and natural analogues on insulin secretion.

4-Hydroxyisoleucine, a peculiar amino acid extracted from fenugreek seeds and never found in mammalian tissues, exhibits interesting insulinotropic activity. To investigate the structural requirements for this stimulating effect, the insulinotropic activity of the major isomer (2S,3R,4S) of 4-hydroxyisoleucine, in the presence of 8. 3 mM glucose, was compared to that of (1) its minor isomer (2R,3R, 4S) (2) its lactone form, (3) classical structurally related amino acids, and (4) synthetic monomethylated analogues.