The artemisia L. Genus: a review of bioactive essential oils.

Numerous members of the Anthemideae tribe are important as cut flowers and ornamental crops, as well as being medicinal and aromatic plants, many of which produce essential oils used in folk and modern medicine and in the cosmetics and pharmaceutical industry. Essential oils generally have a broad spectrum of bioactivity, owing to the presence of several active ingredients that work through various modes of action. Due to their mode of extraction, mostly by distillation from aromatic plants, they contain a variety of volatile molecules such as terpenes, phenol-derived aromatic and aliphatic components. The large genus Artemisia L., from the tribe Anthemideae, comprises important medicinal plants which are currently the subject of phytochemical attention due to their biological and chemical diversity. Artemisia species, widespread throughout the world, are one of the most popular plants in Chinese traditional preparations and are frequently used for the treatment of diseases such as malaria, hepatitis, cancer, inflammation and infections by fungi, bacteria and viruses. Extensive studies of the chemical components of Artemisia have led to the identification of many compounds as well as essentials oils. This review summarizes some of the main reports on the chemistry and anti-infective activities of Artemisia. Li. essential oils from the data in the recent literature (2000-2011).

An update on drug interactions with the herbal medicine Ginkgo biloba.

Medicinal plants are gaining in popularity due to the various advantages they offer, such as fewer side-effects, better patient compliance, relatively low cost and high accessibility as well as their high acceptability due to a long history of use. There is a widespread belief among the general public that herbal preparations are "good for humans" as they are "all natural". However, the increasing use of herbal medicinal products in the community where people are also receiving prescription medicines suggests that adverse herb-drug interactions may be have significant public health consequences. There is little understanding or appreciation of the fact that these "all natural" preparations are actually a combination of potentially biologically active compounds already existing in marketed products in unknown quantities. Among the most popular herbal products used worldwide is Ginkgo biloba, used for the treatment of cerebral insufficiency, peripheral vascular diseases, and frequently taken for the enhancement of memory function. Although the safety of Ginkgo biloba is promising, accumulated data show evidence of significant interactions with medications, which can place individual patients at great risk. In this review, we examined the literature from 2000 to 2008 and focused on the importance of the risk of drug interactions and potential side effects when Ginkgo biloba is involved. The aim of this systematic review is to assess the clinical evidence on interactions between Ginkgo biloba and drugs.

Anti-infectious activity in the Cistaceae family in the Iberian Peninsula.

Infectious diseases caused by bacteria, fungi, viruses and parasites are still a major threat to public health, despite the tremendous progress in human medicine. New antimicrobials are needed in medicine due to the rapid emergence of new resistant and opportunistic microbes and the increasing number of patients suffering from immunosuppressive situations, e.g., acquired immunodeficiency syndrome, transplantation, cancer, etc Research on new antimicrobial substances must therefore be continued and all possible strategies should be explored. Plants have been a source of therapeutic agents from more than 5000 years. Approximately 25% of modern medications are developed from plants. In the area of infectious diseases, 75% of new drugs originated from natural sources between 1981 and 2002. As less than 10% of the world's biodiversity has been tested for biological activity, many more useful natural lead compounds are awaiting discovery. The Cistaceae family comprises a large number of species, growing in the warm temperate regions of the Mediterranean area, that have been and are still used as medicinal plants, particularly in folk medicine. In the present review, we analyse the past, present and future of medicinal plants of the Cistaceae family present in the Iberian Peninsula, both as potential antimicrobial crude drugs as well as a source of natural compounds that act as new anti-infectious agents.

COX-2 and sPLA2 inhibitory activity of aqueous extract and polyphenols of Rhizophora mangle (red mangrove).

The aqueous extract of Rhizophora mangle bark and its polyphenolic fractions showed remarkable in vitro antiinflammatory activity in a preliminary study. The low molecular weight fraction exhibited cyclooxygenase-2 inhibitory activity while the total aqueous extract and the low molecular weight fraction showed secretory phospholipase A(2) inhibitory activity.

Phenylpropanoid glycosides from Scrophularia scorodonia: in vitro anti-inflammatory activity.

Five phenylpropanoid glycosides isolated from Scrophularia scorodonia L. (Scrophulariaceae), namely angoroside A (1), angoroside C (2), angoroside D (3), acteoside (4) and isoacteoside (5), had been evaluated as potential inhibitors of some macrophage functions involved in the inflammatory process. These compounds have been tested in two experimental systems: ionophore-stimulated mouse peritoneal macrophages and human platelets serve as source of COX-1 and 5-LOX, and mouse peritoneal macrophages stimulated with E. coli LPS are the means of testing for COX-2, NO and TNF-alpha activity. None of compounds assayed had a significant effect on LTC(4)-release from calcium ionophore-stimulated mouse peritoneal macrophages. However, the release of PGE(2) by mouse peritoneal macrophages stimulated with calcium ionophore was inhibited by most of these compounds. In the TXB(2)-release assay, acteoside (4), angoroside A (1) and angoroside C (2) showed a significant effect. These five compounds, except angoroside C (2) significantly inhibited LPS-induced PGE(2), NO and TNF-alpha in a concentration-dependent manner. In LPS-stimulated macrophages, the phenylpropanoid glycoside angoroside C (2) only had activity on NO. These results indicate that the pharmacology of these compounds may participate in the anti-inflammatory effect of Scrophularia scorodonia.

Flavonoids and a sesquiterpene lactone from Tanacetum microphyllum inhibit anti-inflammatory mediators in LPS-stimulated mouse peritoneal macrophages.

In our ongoing research into anti-inflammatory compounds from Tanacetum microphyllum, four naturally occurring flavonoids (santin, ermanin, centaureidin and 5,3'-dihydroxy-4'-methoxy-7-methoxycarbonylflavonol) and one sesquiterpene lactone (hydroxyachillin) isolated from this plant, were evaluated as potential inhibitors of some macrophage functions involved in the inflammatory process. These five compounds significantly inhibited lipopolysaccharide (LPS)-induced nitric oxide (NO) and prostaglandin E (2) (PGE (2)) in a concentration-dependent manner. In the tumour necrosis factor-alpha (TNF-alpha) assay, only centaureidin and hydroxyachillin significantly inhibited the accumulation of TNF-alpha. These results indicate that these compounds may contribute to the anti-inflammatory properties of T. microphyllum.

Screening of South American plants against human immunodeficiency virus: preliminary fractionation of aqueous extract from Baccharis trinervis.

Ethanolic and aqueous extracts of 14 South American medicinal plants were tested for inhibitory activity on human immunodeficiency virus (HIV). Both extracts were relatively non-toxic to human lymphocytic MT-2 cells, but only the aqueous extract of Baccharis trinervis exhibited potent anti-HIV activity in an in vitro MTT assay. To delineate the extract-sensitive phase, some studies of the antiviral properties of the active extract are described in this paper. Based on the results presented here, a separation scheme was devised, which permitted the preliminary fractionation of the extract, with the aim of finding an inhibitor of this virus.

Antiviral activity of seven iridoids, three saikosaponins and one phenylpropanoid glycoside extracted from Bupleurum rigidum and Scrophularia scorodonia.

As part of our screening of antiviral agents from medicinal plants, 11 compounds from plant origin (Bupleurum rigidum and Scrophularia scorodonia), three saikosaponins, seven iridoids and one phenylpropanoid glycoside were tested in vitro against herpes simplex type I (HSV-1), vesicular stomatitis virus (VSV) and poliovirus type 1. Five of these compounds showed antiviral activity against VSV. The percentages of cellular viability at the non-toxic limit concentrations of the active compounds were: verbascoside 53.6 % at 500 microg/ml, 8-acetylharpagide 32.1 % at 500 microg/ml, harpagoside 43.3 % at 450 microg/ml, scorodioside 47.8 % at 500 microg/ml and buddlejasaponin IV 56.9 % at 25 microg/ml. Although none of the saikosaponins were active against HSV-1, the iridoid scorodioside showed moderate in vitro anti-HSV-1 activity (30.6 % at 500 microg/ml). However, none of the compounds tested in this survey had any effect against poliovirus.