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Página 1 desde 66 resultados
Antitumor and anti-invasive effects of diverse new macrocyclic lactones, alkylolides and alkenylolides, and their enhancement by hyperthermia.
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Alkylolides and alkenylolides of 198-254 Da such as hexadecan-16-olide and 9-hexadecen-16-olide were chemically synthesized in the present study as new macrocyclic lactones that are structurally different from widespread natural macrocyclic lactones including bryostatin (887 Da) and rhizoxin (613
Inhibition of NF-kappaB by combination therapy with parthenolide and hyperthermia and kinetics of apoptosis induction and cell cycle arrest in human lung adenocarcinoma cells.
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We investigated the mechanisms of thermosensitization related to combination therapy with sesquiterpene lactone parthenolide (PTL), a nuclear factor-kappaB (NF-kappaB) inhibitor, and hyperthermia using human lung adenocarcinoma cells A549. The kinetics of apoptosis induction and cell cycle of cells
Inhibition of 5-lipoxygenase and cyclo-oxygenase in leukocytes by feverfew. Involvement of sesquiterpene lactones and other components.
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Leaves or infusions of feverfew, Tanacetum parthenium, have long been used as a folk remedy for fever, arthritis and migraine, and derived products are widely available in U.K. health food shops. Previous reports have suggested interactions with arachidonate metabolism. Crude chloroform extracts of
Isolation and identification of antiplasmodial sesquiterpene lactones from Oncosiphon piluliferum.
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Oncosiphon piluliferum (Asteraceae) is used traditionally to treat a variety of ailments, mainly fevers. This prompted the screening of this plant for antiplasmodial properties. The dichloromethane extract of the aerial parts of the plant showed activity in vitro against the chloroquine-sensitive
Molecular mechanisms of hyperthermia-induced apoptosis enhanced by withaferin A.
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Hyperthermia is a good therapeutic tool for non-invasive cancer therapy; however, its cytotoxic effects are not sufficient. In the present study, withaferin A (WA), a steroidal lactone derived from the plant Withania somnifera Dunal, has been investigated for its possible enhancing effects on
Synthesis and anti-viral activity of a series of sesquiterpene lactones and analogues in the subgenomic HCV replicon system.
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Hepatitis C virus (HCV) infection is a severe liver disease that often leads to liver cirrhosis and hepatocellular carcinoma (HCC). Current therapy is inadequate to conquer this viral disease. In this study, we identified parthenolide (1), an active component in feverfew, a popular remedy for fever
Sesquiterpene lactones with antinociceptive and antipyretic activity from two Centaurea species.
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BACKGROUND
Several Centaurea species are used to alleviate pain and inflammatory symptoms in rheumatoid arthritis, high fever, and head ache in Turkish folk medicine.
OBJECTIVE
The effectiveness of extracts, fractions and subfractions from dried Centaurea solstitialis L. subsp. solstitialis (CSS)
Styryl lactones and their derivatives: biological activities, mechanisms of action and potential leads for drug design.
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Nature is an inexhaustible source of natural compounds with interesting biological activities. In general, natural products are an important source of new compounds with a variety of structural arrangements and singular properties. Styryl lactones are a group of secondary metabolites ubiquitous in
Promotive effects of hyperthermia on the cytostatic activity to Ehrlich ascites tumor cells by diverse delta-alkyllactones.
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OBJECTIVE
To evaluate promotive effects of hyperthermia on antitumor activity of new delta-alkyllactones (DALs) of low molecular weight (184-254 Da), chemically synthesized, which are different from natural macrocyclic lactones of high molecular weight (348-439 Da), such as camptothecin and
The Pseudomonas aeruginosa quorum-sensing molecule N-(3-oxododecanoyl)homoserine lactone contributes to virulence and induces inflammation in vivo.
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Pseudomonas aeruginosa has two well-characterized quorum-sensing systems, Las and Rhl. These systems are composed of LuxR-type proteins, LasR and RhlR, and two acyl homoserine lactone (AHL) synthases, LasI and RhlI. LasI catalyzes the synthesis of N-(3-oxododecanoyl)homoserine lactone (3O-C12-HSL),
Parthenolide attenuates LPS-induced fever, circulating cytokines and markers of brain inflammation in rats.
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Parthenolide, a sesquiterpene lactone, has been reported to exhibit a variety of anti-inflammatory and immunomodulatory effects. To test the effect of parthenolide on brain inflammatory responses, brain oxidative stress and fever, we treated rats with parthenolide (1 mg/kg), simultaneously or 1 h
Identification of a quorum-sensing signal molecule in the facultative intracellular pathogen Brucella melitensis.
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Brucella melitensis is a gram-negative alpha2-proteobacterium responsible for abortion in goats and for Malta fever in humans. This facultative intracellular pathogen invades and survives within both professional and nonprofessional phagocytes. A dichloromethane extract of spent culture supernatant
Altered pharmacokinetics and metabolism of CPT-11 in liver dysfunction: a need for guidelines.
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Metabolic conversion of CPT-11 is a major route of elimination of this new topoisomerase 1 inhibitor. Presently, recommendations for dose adjustments of CPT-11 in patients with liver dysfunction are lacking. We describe the case of a patient with metastatic colon cancer with liver dysfunction
Alternative administration of camptothecin analogues.
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The binding of camptothecin (CPT) to the DNA-topoisomerase complex is reversible, but it needs to be maintained for maximal inhibitory activity. It is also dependent on the chemical structure of CPT. The lactone form is thought to be necessary for the activity. In human serum, the equilibrium
A phase I and pharmacokinetic study of intraperitoneal topotecan.
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OBJECTIVE
To evaluate the feasibility and pharmacology of intraperitoneal (IP) topotecan.
METHODS
Fifteen patients with recurrent ovarian cancer in a phase I trial were treated with escalating IP topotecan doses (5-30 mg/m(2)) for pharmacokinetic analysis.
RESULTS
Dose limiting toxicity (DLT) was
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