Quercetin is a dietary flavonoid which exerts vasodilator, antiplatelet and antiproliferative effects and reduces blood pressure, oxidative status and end-organ damage in humans and animal models of systemic hypertension. We hypothesized that oral quercetin treatment might be protective in a rat model of pulmonary arterial hypertension. Three weeks after injection of monocrotaline, quercetin (1...

plants are rich source of phenolic compounds (phenolic acids, flavonoids and tannins) that are most important natural antioxidants. in the present study two ultrasonic methods including probe and bath were used for the extraction of phenolic and flavonoid compounds from celtis australis. the effects of different extraction time including 30, 60 and 90 min (bath method) and 5, 10 and 20 min (pro...

This study investigated the hepatoprotective and antioxidant response to intraperitoneal, intravenous, subcutaneous and oral treatment with quercetin in adult male Wistar rat. The animals were divided randomly into the four groups according to the routes of administration. Quercetin was allowed to react with selected hepatic isoenzymes (aspartate amino transferase, alanine amino transferase) vi...

Quercetin is the most abundant polyphenolic flavonoid found in plants. Several studies suggest that it has potent anticancer effects. The present study examines the apoptosis-inducing activity and the underlying mechanism of action of quercetin in a methotrexate (MTX)-resistant osteosarcoma model. Our results showed that quercetin inhibited cell viability in a dose-dependent manner and there wa...

Quercetin is one of the six subclasses of flavonoid compounds1, which has antioxidant properties2. Quercetin is found in many common foods including green tea1, apples, onions and berries3. Its structure with the indicated C atoms and rings is presented in Figure 1. Because of its interesting chemical and biological properties, quercetin has been one of the most studied flavonoids. Quercetin is...

The finding of 3,4-dihydroxyphenylacetic acid (DHPAA) in the urine of rabbits after the oral ingestion of rutin or its aglycone quercetin has been reported from this Laboratory (1). In this same report it was stated that in each case after the administration of the flavonoid an examination of paper chromatograms of the ether extracts of the urine revealed the excretion of at least four metaboli...

The finding of 3,4-dihydroxyphenylacetic acid (DHPAA) in the urine of rabbits after the oral ingestion of rutin or its aglycone quercetin has been reported from this Laboratory (1). In this same report it was stated that in each case after the administration of the flavonoid an examination of paper chromatograms of the ether extracts of the urine revealed the excretion of at least four metaboli...

We investigated a molecular mechanism underlying quercetin-mediated amelioration of colonic mucosal injury and analyzed chemical structure contributing to the quercetin's effect. Quercetin up-regulated vascular endothelial growth factor (VEGF), an ulcer healing factor, not only in colon epithelial cell lines but also in the inflamed colonic tissue. VEGF derived from quercetin-treated colon epit...

The natural product quercetin is a flavonoid found in many fruits and vegetables. Previous research has shown that quercetin has antitumor, anti-inflammatory, antiallergic, and antiviral activities. In the present investigation we studied the effect of quercetin on the ability of prostate cancer cell lines with various degrees of aggressive potential to form colonies in vitro. Specifically, we ...