Salvadora persica leaves: phytochemical profile and in vitro-inhibitory activity on inflammatory mediators implicated in periodontal disease.

CONTEXT: Virtually all parts of Salvadora persica L. (Salvadoraceae) are used in traditional medicine. The twigs and leaves are used for oral health, but leaves are far less investigated. OBJECTIVE: This study assesses the oral health-promoting potential of S. persica leaves with emphasis on anti-inflammatory and antiproliferative effects and provides an in depth-characterization of their metabolite profile. MATERIALS AND METHODS: Hot-water and methanolic S. persica leaf extracts (1, 10, and 100 µg/mL) and their major constituents (5, 10, and 50 µM), were subjected to cellular assays on IL-8 and TNFα release in LPS-stimulated human neutrophils, NO-release in LPS/IFNγ stimulated mouse macrophages, and proliferation of HNO97 human tongue carcinoma cells. Metabolite profiling was performed by UHPLC-HRMS analysis. Major constituents were isolated and structurally elucidated. RESULTS AND DISCUSSION: Both extracts showed pronounced anti-inflammatory activity in LPS-stimulated neutrophils. Major identified compound classes were flavonoid glycosides, the glucosinolate glucotropaeolin, phenyl- and benzylglycoside sulfates, and megastigmane glycosylsulfates, the latter ones identified for the first time in S. persica. Glucotropaeolin strongly inhibited the release of IL-8 and TNF-α (13.3 ± 2.0 and 22.7 ± 2.6% of the release of stimulated control cells at 50 µM), while some flavonoids and 3-(3'-O-sulfo-ß-d-glucopyranosyloxy)-7,8-dihydro-ß-ionone, a newly isolated megastigmane glycosylsulfate, were moderately active. Benzylisothiocyanate, which is likely formed from glucotropaeolin during traditional application of S. persica, showed considerable antiproliferative activity (IC50 in HNO97 cells: 10.19 ± 0.72 µM) besides strongly inhibiting IL-8 and TNFα release. CONCLUSIONS: Glucotropaeolin and benzylisothiocyanate are likely implicated in the oral health-promoting effects of S. persica leaves. The chemistry and pharmacology of the newly identified megastigmane glycosylsulfates should be further evaluated.

Germacranolides from Carpesium divaricatum: Some New Data on Cytotoxic and Anti-Inflammatory Activity.

Carpesium divaricatum Sieb. & Zucc., a traditional medicinal plant used as an inflammation-relieving remedy, is a rich source of terpenoids. At least 40 germacrane-type sesquiterpene lactones, representatives of four different structural groups, were isolated from the plant. Cytotoxicity against cancer cells in vitro is the most frequently described biological activity of the compounds. However, little is known about the selectivity of the cytotoxic effect. The anti-inflammatory activity of the germacranolides is also poorly documented. The objective of the present study was to assess the cytotoxic activity of selected C. divaricatum germacranolides-derivatives of 4,5,8,9-tetrahydroxy-3-oxo-germacran-6,12-olide towards cancer and normal cell lines (including cells of different p53 status). Moreover, to assess the anti-inflammatory effect of the compounds, the release of four proinflammatory cytokines/chemokines (IL-1ß, IL-8, TNF-α and CCL2) by lipopolysaccharide-stimulated human neutrophils was measured by ELISA. The investigated sesquiterpene lactones demonstrated nonselective activity towards prostate cancer (Du145 and PC3) and normal prostate epithelial cells (PNT2) as well as against melanoma cells (A375 and HTB140) and keratinocytes (HaCaT). Cytotoxic activity against osteosarcoma cells was independent of their p53 status. In sub-cytotoxic concentrations (0.5-2.5 µM) the studied compounds significantly decreased cytokine/chemokine release by lipopolysaccharide-stimulated human leukocytes.

A New Diterpene and Anti-inflammatory Sesquiterpene Lactones from Sigesbeckia orientalis.

Sigesbeckia orientalis, more commonly referred to as Herba Sigesbeckiae or Xi Xian Cao in traditional Chinese medicine and hy thiêm in traditional Vietnamese medicine, is used in China and Vietnam to treat inflammatory diseases such as arthritis, rheumatism, and joint pain. In initial investigations, the dichloromethane extract from the aerial parts of S. orientalis showed distinct inhibitory effects on the release of interleukin-8 in human neutrophils. Therefore, the purpose of the present study was the phytochemical investigation of the bioactive dichloromethane extract and the in vitro analysis of the effects of the isolated compounds on interleukin-8, interleukin-1ß, tumor necrosis factor-α, and monocyte chemoattractant protein 1 release, and surface expression of adhesion molecules (CD11a, CD11b, and CD62L) in lipopolysaccharide-stimulated human neutrophils to identify the active principle(s). The separation of the bioactive dichloromethane extract using various chromatographic techniques led to the isolation of nine compounds. Their chemical structures were elucidated from nuclear magnetic resonance and mass spectrometry data. One diterpene, 17(13 → 14)-abeo-ent-3S*,13S*,16-trihydroxystrob-8(15)-ene, was identified as a new natural product. Three germacranolide sesquiterpene lactones inhibited interleukin-8 production with IC50 values between 1.6 and 6.3 µM, respectively, and tumor necrosis factor-α production with IC50 values between 0.9 and 3.3 µM, respectively. Furthermore, they significantly inhibited interleukin-1ß and monocyte chemoattractant protein 1 production and diminished the effects of lipopolysaccharide on the surface expression of the adhesion molecules CD11a, CD11b, and CD62L. These findings support the traditional use of S. orientalis in the treatment of inflammatory diseases.

UHPLC-DAD-ESI-MS/MS and HPTLC profiling of ash leaf samples from different commercial and natural sources and their in vitro effects on mediators of inflammation.

INTRODUCTION: In European traditional medicine, common ash leaf infusion is recommended by European Medicines Agency to treat minor articular pain and to increase the amount of urine for flushing minor urinary complaints. However, a comprehensive ultra-high-performance liquid chromatography diode array detector electrospray ionisation tandem mass spectrometry (UHPLC-DAD-ESI-MS/MS) analysis of this pharmacopeial plant material has never been performed. Moreover, the number of biological and pharmacological investigations proving the usefulness of this plant material in recommended traditional uses is surprisingly small. OBJECTIVE: Phytochemical profiling of ash leaf samples from different commercial and natural sources and the determination of the in vitro effects on inflammatory mediators in a model of human neutrophils. METHODS: Ash leaf samples were characterised by total hydroxycinnamic acid content and by high-performance thin layer chromatography (HPTLC), UHPLC-DAD-ESI-MS/MS methods. The effects of leaf infusions on reactive oxygen species (ROS), tumor necrosis factor (TNF-α), interleukin 8 (IL-8), interleukin 1ß (IL-1ß), and monocyte chemoattractant protein 1 (MCP-1) production by neutrophils were measured using luminol-dependent chemiluminescence and enzyme-linked immunosorbent assay (ELISA). RESULTS: In ash leaf samples 64 compounds were identified or partly identified together with four unknown compounds. The major compounds detected belong to different structural groups, including phenolic acid derivatives, phenylethanoids, flavonoids, iridoids, secoiridoids and lignans. The major compounds detected in ash samples were chlorogenic acid, quercetin-3-O-rutinoside, verbascoside, oleuropein and ligstroside. However, one sample contained coumarin derivatives. This finding suggested adulteration with other Fraxinus species and/or plant parts. All infusions were able to inhibit ROS, cytokine and chemokine production. CONCLUSIONS: The performed phytochemical and biological analyses contribute to the knowledge about this pharmacopeial plant material and supports its traditional use to treat minor inflammatory complaints.

Constituents of Xerolekia speciosissima (L.) Anderb. (Inuleae), and Anti-Inflammatory Activity of 7,10-Diisobutyryloxy-8,9-epoxythymyl Isobutyrate.

Xerolekia speciosissima (L.) Anderb., a rare plant from the north of Italy, is a member of the Inuleae-Inulinae subtribe of the Asteraceae. Despite its close taxonomic relationship with many species possessing medicinal properties, the chemical composition of the plant has remained unknown until now. A hydroalcoholic extract from the aerial parts of X. speciosissima was analyzed by HPLC-DAD-MSn, revealing the presence of caffeic acid derivatives and flavonoids. In all, 19 compounds, including commonly found chlorogenic acids and less frequently occurring butyryl and methylbutyryl conjugates of dicaffeoylquinic and tricaffeoylhexaric acids, plus two flavonoids, were tentatively identified. Chromatographic separation of a hydroalcoholic extract from the capitula of the plant led to the isolation of (+)-dehydrodiconiferyl alcohol 4-O-ß-glucopyranoside, quercimeritrin, astragalin, isoquercitrin, 6-hydroxykaempferol-7-O-ß-glucoside, quercetagitrin, methyl caffeate, caffeic acid, protocatechuic acid, chlorogenic acid and 1,5-dicaffeoylquinic acid. Composition of a nonpolar extract from the aerial parts of the plant was analyzed by chromatographic methods supported with 1H-NMR spectroscopy. The analysis revealed the presence of loliolide, reynosin, samtamarine, 2,3-dihydroaromaticin, 2-deoxy-4-epi-pulchellin and thymol derivatives as terpenoid constituents of the plant. One of the latter compounds-7,10-diisobutyryloxy-8,9-epoxythymyl isobutyrate-at concentrations 0.5, 1.0 and 2.5 µM, significantly reduced IL-8, IL-1ß and CCL2 excretion by LPS-stimulated human neutrophils.

Eupatoriopicrin Inhibits Pro-inflammatory Functions of Neutrophils via Suppression of IL-8 and TNF-alpha Production and p38 and ERK 1/2 MAP Kinases.

During chronic inflammation, neutrophils acting locally as effector cells not only activate antibacterial defense but also promote the inflammatory response. Interleukin 8 (IL-8), the main cytokine produced by activated neutrophils, positively correlates with the severity of respiratory tract diseases. By screening European plants traditionally used for treating respiratory tract diseases, we found that extracts of aerial parts of Eupatorium cannabinum inhibit IL-8 release from neutrophils. Using bioassay-guided fractionation, we identified five sesquiterpene lactones, eupatoriopicrin (1), 5'-deoxyeupatoriopicrin (2), hiyodorilactone A (3), 3-hydroxy-5'- O-acetyleupatoriopicrin = hiyodorilactone D (4), and hiyodorilactone B (5), that efficiently (IC50 < 1 µM) inhibited IL-8 and TNF-α release in lipopolysaccharide (LPS)-stimulated human neutrophils. Moreover, all these sesquiterpene lactones suppressed the adhesion of human neutrophils to an endothelial monolayer by downregulating the expression of the ß2 integrin CD11b/CD18 on the neutrophil surface. Furthermore, eupatoriopicrin efficiently suppressed LPS-induced phosphorylation of p38 MAPK and ERK and attenuated neutrophil infiltration in the thioglycolate-induced peritonitis model in mice. Altogether, these results demonstrate the potential of the sesquiterpene lactone eupatoriopicrin as a lead substance for targeting inflammation.

The Activity of Urolithin A and M4 Valerolactone, Colonic Microbiota Metabolites of Polyphenols, in a Prostate Cancer In Vitro Model.

The gut microbiota-derived metabolites of ellagitannins and green tea catechins, urolithin A (uroA) and 5-(3',4',5'-trihydroxyphenyl)-γ-valerolactone (M4), respectively, are among the main compounds absorbed into human system after ingestion of these polyphenols. The aim of this study was to establish the effects of M4, uroA, and their combinations on LNCaP cells, an androgen dependent prostate cancer in vitro model.. The LNCaP cells were incubated with increasing concentrations of tested metabolites. The cell proliferation was determined by measurement of DNA-bisbenzimide H 33 258 complexes fluorescence. The isobolographic analysis was used to establish the type of interaction between metabolites. The apoptosis, androgen receptor (AR) localization, and phosphorylation of Akt kinase were measured by flow cytometry. Prostate-specific antigen (PSA) secretion was determined by ELISA. M4 showed modest antiproliferative activity in LNCaP cells (IC50 = 117 µM; CI: 81 - 154). UroA decreased proliferation (IC50 = 32.7 µM; CI: 24.3 - 41.1) and induced apoptosis of LNCaP cells. The mixture of M4 with uroA had synergistic antiproliferative effect. Moreover, M4 potentiated inhibition of PSA secretion and enhanced retention of AR in cytoplasm caused by uroA. Interestingly, uroA increased levels of pSer473 Akt in LNCaP cells. These results show that colonic metabolites may contribute to chemoprevention of prostate cancer by varied polyphenol-rich diet or composite polyphenol preparations.

Inhibition of Pro-Inflammatory Functions of Human Neutrophils by Constituents of Melodorum fruticosum Leaves.

In an initial screening, the dichloromethane extract from the leaves of Melodorum fruticosum showed distinct inhibitory effects on the release of interleukin-8 (IL-8) in human neutrophils. Therefore, the aim of the present study was the phytochemical and pharmacological investigation of this extract, to better understand which compounds might be responsible for the anti-inflammatory effect. Phytochemical analysis led to the isolation of 12 known compounds and two new natural products, 5-hydroxy-6-(2-hydroxybenzyl)-4',7-dimethoxyflavanone (13) and 2',4'-dihydroxy-3'-(2-hydroxybenzyl)-4,6'-dimethoxychalcone (14). The influence of the isolated compounds on the production and release of the pro-inflammatory factors IL-8, tumor necrosis factor alpha (TNF-α), reactive oxygen species (ROS), and adhesion molecules (CD62L and CD11b) in human neutrophils was evaluated. Three constituents, melodamide A, 2',4'-dihydroxy-4,6'-dimethoxychalcone, and 2',6'-dihydroxy-4'-methoxychalcone, showed significant inhibition of IL-8 release (IC50 =6.6, 8.6, and 11.6 µm, respectively) and TNF-α production (IC50 =4.5, 13.3, and 6.2 µm, respectively).

Determination of the Phenolic Profile and Antioxidant Properties of Salvia viridis L. Shoots: A Comparison of Aqueous and Hydroethanolic Extracts.

Salvia viridis L. is an annual herb used in Mediterranean medicine. The purpose of this study was to determine the polyphenol profile of aqueous (decoction and infusion) and hydroethanolic extracts of aerial parts of field-grown S.viridis and to evaluate their antioxidant activity. The polyphenol profiling was performed via UPLC-DAD/ESI-MS. Additionally, the total polyphenol content in extracts tested were determined by UV-Vis spectrophotometry using the Folin-Ciocalteu assay. The antioxidant effect was evaluated by the FRAP, DPPH, ABTS, O2•− scavenging and TBARS methods. The hydroethanolic extract gave the highest content of total phenolic compounds, followed by the infusion. The UPLC-DAD/ESI-MS analysis of extracts showed a total of 19 phenolic compounds identified as flavonoids (four compounds), phenylethanoids (eight compounds) and phenolic acids (seven compounds). Rosmarinic acid was the predominant phenolic acid, verbascoside was the predominant phenylethanoid, while apigenin glucuronide or methylluteolin glucuronide, depending on the sample, were the predominant flavonoids in the analyzed extracts. The presence of a high polyphenol level indicated a high antioxidant activity of both the infusion and the hydroalcoholic extract. These results indicate that S. viridis is a rich resource of phenolic compounds and can be used in dietary applications with the potential to reduce oxidative stress.

Phase II Conjugates of Urolithins Isolated from Human Urine and Potential Role of ß-Glucuronidases in Their Disposition.

In recent years, many xenobiotics derived from natural products have been shown to undergo extensive metabolism by gut microbiota. Ellagitannins, which are high molecular polyphenols, are metabolized to dibenzo[b,d]pyran-6-one derivatives-urolithins. These compounds, in contrast with their parental compounds, have good bioavailability and are found in plasma and urine at micromolar concentrations. In vivo studies conducted for ellagitannin-containing natural products indicate their beneficial health effects toward inflammation and cancer, which are associated with the formation of urolithins. However, the great majority of in vitro experiments that have revealed the molecular mechanisms responsible for the observed effects were conducted for urolithin aglycones. These studies are thus incongruent with the results of pharmacokinetic studies that clearly indicate that glucuronide conjugates are the dominant metabolites present in plasma, tissue, and urine. The aim of this study was to isolate and structurally characterize urolithin conjugates from the urine of a volunteer who ingested ellagitannin-rich natural products, and to evaluate the potential role of ß-glucuronidase-triggered cleavage in urolithin disposition. Glucuronides of urolithin A, iso-urolithin A, and urolithin B were isolated and shown to be cleaved by the ß-glucuronidases released by neutrophils from azurophilic granules upon N-formylmethionine-leucyl-phenylalanine stimulation as well as by Escherichia coli standard strains and clinical isolates from patients with urinary tract infections. These results justify the hypothesis that the selective activation of urolithin glucuronides by ß-glucuronidase, which are present at high concentrations at inflammation and infection sites and in the microenvironments of solid tumors, could locally increase the concentration of bioactive urolithin aglycones.

Bioassay-Guided Isolation of Iridoids and Phenylpropanoids from Aerial Parts of Lamium album and Their Anti-inflammatory Activity in Human Neutrophils.

In traditional medicine, flowers and aerial parts of Lamium album are assigned by their anti-inflammatory, antiseptic, and mucolytic activities, and are used in chronic bronchitis and pharyngitis as well as skin, vaginal, and cervical inflammation.The aim of the present study was to compare effects of ethanolic extracts prepared from flowers and aerial parts of L. album on selected functions of human neutrophils, which are involved in an inflammatory response. In order to identify the compounds engaged in the anti-inflammatory activity of extracts, the bioassay-guided isolation of compounds was performed based on the inhibition of cytokine secretion by stimulated neutrophils.The extracts were phytochemically characterized with the HPLC-DAD-MSn method. The inhibition of reactive oxygen species production by formyl-met-leu-phenylalanine- or phorbol 12-myristate 13-acetate-stimulated neutrophils was determined using luminol- or lucigenin-dependent chemiluminescence. The effect on myeloperoxidase secretion by neutrophils was established spectrophotometrically. The levels of cytokine (interleukin 8, TNF-α) production after extract treatment was measured by ELISA.The most abundant constituents of extracts were phenylpropanoids, iridoids, flavonoids, and phenolic acids. Both extracts at concentrations of 25 and 100 µg/mL significantly inhibited reactive oxygen species production, and myeloperoxidase and interleukin 8 secretion. The phenylethanoid glycosides, such as lamiusides A, B, and C as well as 6″-O-ß-D-glucopyranosylmartynoside, were isolated and identified. The cells treated with 6″-O-ß-D-glucopyranosylmartynoside and lamiuside B produced 29.47 ± 7.11 % and 64.67 ± 5.25 % of interleukin 8, respectively, compared to non-treated control cells.Our results support the traditional use of L. album and indicate it as a potential source of natural anti-inflammatory constituents, such as phenylpropanoids.

Evaluation of the Effect of Epilobium angustifolium Aqueous Extract on LNCaP Cell Proliferation in In Vitro and In Vivo Models.

Epilobium sp. are commonly used in traditional medicine in the treatment of early stages of benign prostatic hyperplasia and inflammation. It is suggested that a dominating constituent, oenothein B, is responsible for the extracts therapeutic effects. Several bioactivities were established for extracts and oenothein B in various in vitro models, but due to the questionable bioavailability of this dimeric macrocyclic ellagitannin, their significance in the in vivo effects remains unresolved. We have thus focused our attention on a complex comparative investigation of the in vitro and in vivo activities of phytochemically characterized Epilobium angustifolium aqueous extract and oenothein B on prostate cancer cells proliferation.Incubation of different cell lines with E. angustifolium aqueous extract resulted in a significant reduction of proliferation of PZ-HPV-7 and LNCaP cells, which was partly associated with antiandrogenic activity. These effects were fully congruent with oenothein B, examined in parallel. Oral supplementation of rats implanted with LNCaP cells with E. angustifolium aqueous extract 50-200 mg/kg b. w. resulted in a reduction of the occurrence of prostatic adenoma up to 13 %. Oenothein B was not detected in the urine and feces of the E. angustifolium aqueous extract-treated group, however, conjugates of nasutins gut microbiota metabolites of ellagitannins were detected in the urine, while in human volunteers supplemented with Epilobium tea, only urolithin conjugates were present.Despite observing significant and consistent effects in vitro and in vivo, we were unable to point out unequivocally the factors contributing to the observed E. angustifolium aqueous extract activity, facing the problems of an unknown metabolic fate of oenothein B and interspecies differences in E. angustifolium aqueous extract gut microbiota metabolism.

Differences in Metabolism of Ellagitannins by Human Gut Microbiota ex Vivo Cultures.

Ellagitannin-rich plant materials are used as popular remedies in the treatment of various inflammatory diseases. Urolithins are gut microbiota metabolites of ellagitannins and are considered responsible for in vivo health effects. Various natural products have been studied that are known sources of urolithins. However, few studies have focused on the metabolism of ellagitannin molecules. The aim of the study was to examine the metabolic fate of select ellagitannins using ex vivo cultures of human gut microbiota. Fifteen monomeric and dimeric ellagitannins, 1-O-galloyl-4,6-(S)-HHDP-ß-d-glucose (2), pedunculagin (3), potentillin (4), casuarictin (5), coriariin B (6), vescalagin (7), castalagin (8), stachyurin (9), casuarinin (10), stenophyllinin A (11), stenophyllanin A (12), salicarinin A (13), gemin A (14), agrimoniin (15), and oenothein B (16), and ellagic acid (1) were studied. The formation of the metabolites in ex vivo human microbiota cultures was monitored using UHPLC-DAD-MS/MS. Ellagitannins possessing hexahydroxydiphenoyl moieties were metabolized to 6H-dibenzo[b,d]pyran-6-one derivatives, i.e., urolithins. The observed differences in amounts of produced urolithins indicated that the individual microbiota composition and type of ingested ellagitannins could determine the rate of urolithin production. When the oral ingestion of natural products containing ellagitannins with hexahydroxydiphenoyl groups is considered, the formation of urolithins and their bioactivity should be addressed.

Quantitative Determination of Secoiridoids and Phenylpropanoids in Different Extracts of Ligustrum Vulgare L. Leaves by a Validated HPTLC-Photodensitometry Method.

INTRODUCTION: The genus Ligustrum (Oleaceae) is distributed in Europe and Asia (south China and Korea), where it is used to prevent hypertension, sore throats, inflammation and diabetes. The main groups of compounds in extracts of Ligustrum vulgare are biologically active secoiridoids and phenylpropanoids. OBJECTIVES: The aim of the study was primarily the development and validation of a HPTLC-photodensitometry method for separation and determination of secoiridoids (oleacein, oleuropein) and phenylpropanoids (echinacoside) in different extracts prepared from leaves of L. vulgare. A secondary issue was the quantitative screening of oleacein, oleuropein and echinacoside in extracts from leaves collected at different stages of plant growth (from May to September). METHODS: A HPTLC-photodensitometry method was developed and validated for quantification of oleuropein, oleacein and echinacoside in plant extracts (aqueous and ethanolic extract, decoction, infusion). Silica gel was used as the stationary phase and dichloromethane:methanol:formic acid:water (80:25:1.5:4, v/v/v/v) as the mobile phase. RESULTS: The HPTLC-photodensitometry method developed for quantification of oleacein, oleuropein and echinacoside was specific, accurate and precise. The presence of oleacein was detected in aqueous extracts, whereas oleuropein was present, in particular, in ethanolic extracts, decoctions and infusions. Echinacoside was detected in all the extracts prepared. The content of secoiridoids was variable from May to September, whereas the amount of echinacoside increased in this term. CONCLUSION: The developed and validated HPTLC-photodensitometry method allowed performing fast screening of quantitative profiles of oleacein, oleuropein and echinacoside in preparations of privet leaves.

Influence of gut microbiota-derived ellagitannins' metabolites urolithins on pro-inflammatory activities of human neutrophils.

Ellagitannin-rich products exhibit beneficial influence in the case of inflammation-associated diseases. Urolithins, metabolites of ellagitannins produced by gut microbiota, in contrary to high molecular weight hydrophilic parental polyphenols, possess well established bioavailability. Because of the important role of neutrophils in progression of inflammation, the influence of urolithins on their pro-inflammatory functions was tested. Urolithin B at a concentration of 20 µM showed significant inhibition of interleukin 8 and extracellular matrix-degrading enzyme MMP-9 production. It was also significantly active in prevention of cytochalasin A/formyl-met-leu-phenylalanine-triggered selectin CD62L shedding. Urolithin C was the only active compound towards inhibition of elastase release from cytochalasin A/formyl-met-leu-phenylalanine-stimulated neutrophils with 39.0 ± 15.9% inhibition at a concentration of 5 µM. Myeloperoxidase release was inhibited by urolithins A and C (at 20 µM by 46.7 ± 16.1 and 63.8 ± 8.6%, respectively). Urolithin A was the most potent reactive oxygen species release inhibitor both in formyl-met-leu-phenylalanine and 4ß-phorbol-12ß-myristate-R13-acetate-stimulated neutrophils. At the concentration of 1 µM, it caused reactive oxygen species level decrease by 42.6 ± 26.6 and 53.7 ± 16.0%, respectively. Urolithins can specifically modulate inflammatory functions of neutrophils, and thus could contribute to the beneficial health effects of ellagitannin-rich medicinal plant materials and food products.

Determination of C-glucosidic ellagitannins in Lythri salicariaeherba by ultra-high performance liquid chromatography coupled with charged aerosol detector: method development and validation.

INTRODUCTION: Lythri salicariaeherba is a pharmacopoeial plant material used by patients in the form of infusions in the treatment of acute diarrhoea. According to its pharmacopoeial monograph it is standardised for total tannin content, which should be not less than 5.0% using pyrogallol as a standard. Previous studies have shown that aqueous extracts from Lythri herba contain mainly ellagitannins among which vescalagin, castalagin and salicarinins A and B are dominating constituents. OBJECTIVE: To develop and validate an efficient UHPLC coupled with a charged aerosol detector (CAD) method for quantification of four major ellagitannins in Lythri salicariaeherba and in one commercial preparation. METHODS: Extraction conditions of ellagitannins from plant material were optimised. The relative response factors for vescalagin, castalagin and salicarinins A and B using gallic acid as an external standard were determined for the CAD detector. Then, a UHPLC method for quantification of ellagitannins was developed and validated. RESULTS: Four major ellagitannins were quantified in four samples of Lythri herba and in one commercial preparation. The sum of ellagitannins for each sample was determined, which varied from 30.66 to 48.80 mg/g of raw material and 16.57 mg per capsule for the preparation investigated. CONCLUSION: The first validated UHPLC/CAD UHPLC-CAD method for quantification of four major ellagitannins was developed. The universality of the CAD response was evaluated and it is shown that although all compounds analysed have similar structures their CAD response differs significantly.

Effects of an aqueous extract from leaves of Ligustrum vulgare on mediators of inflammation in a human neutrophils model.

Leaves of Ligustrum vulgare (common privet) have been used for treatment of oropharyngeal inflammations or as antirheumatic, diuretic, and hypotensive agents in folk medicine in southern Europe. Taking into account that neutrophils are involved in the inflammation, the aim of the study was to determine the effect of an aqueous extract prepared from leaves of Ligustrum vulgare on neutrophil functions. The extract was characterized by the HPLC-DAD-MSn method. The inhibition of reactive oxygen species production by formyl-met-leu-phenylalanine- or phorbol 12-myristate 13-acetate-stimulated neutrophils was determined using luminol- or lucigenin-dependent chemiluminescence. The effect on myeloperoxidase, metalloproteinase 9, and interleukin 8 production by neutrophils was measured by an enzyme-linked immunosorbent assay. Neutrophil elastase release was established spectrophotometrically. The expression of adhesion molecules on neutrophils was analyzed with flow cytometry. The main compounds detected were flavonoids, phenylpropanoids, hydroxycinnamates, and secoiridoids. The inhibition of oxidative burst by the extract was comparable in both stimuli models (formyl-met-leu-phenylalanine: IC50 = 18.2 ± 4.0 µg/mL; phorbol 12-myristate 13-acetate: IC50 = 19.8 ± 3.0 µg/mL). The extract in the concentration range of 5-50 µg/mL inhibited neutrophil elastase release by 23.9-34.1 % and myeloperoxidase release by 24.2-37.4 %. The inhibitory effect on metalloproteinase 9 and interleukin 8 production was around 20 %. The extract in the highest concentration modulated the expression of L-selectin and ß2 integrin. Our results partly support the traditional use of common privet leaves as an anti-inflammatory agent.

Effects of penta-O-galloyl-ß-D-glucose on human neutrophil function: significant down-regulation of L-selectin expression.

Penta-O-galloyl-ß-D-glucose (PGG) occurrs in high concentrations in medicinal herbs such as Rhus chinensis, Paeonia suffruticosa, Acer truncatum and Terminalia chebula, which demonstrate anti-inflammatory activity. We investigated the effect of PGG on stimulated and non-stimulated neutrophils in processes which included reactive oxygen species generation (ROS), metalloproteinase-9 and interleukin-8 secretion (IL-8), ß2 integrin (CD11b) and L-selectin (CD62L) expression and apoptosis. In concentrations of 5 µM-20 µM, PGG demonstrated statistically significant inhibition of ROS generation, IL-8 secretion and ß2 integrin expression in stimulated neutrophils. The inhibition of L-selectin expression by PGG resulted in prevention in neutrophils' endothelial attachment. The result obtained may explain the anti-inflammatory activity of this compound and underline the contribution of PGG in the activity of PGG rich plant extracts.

Extracts from Epilobium sp. herbs, their components and gut microbiota metabolites of Epilobium ellagitannins, urolithins, inhibit hormone-dependent prostate cancer cells-(LNCaP) proliferation and PSA secretion.

Extracts from Epilobium sp. herbs have been traditionally used in the treatment of prostate-associated ailments. Our studies demonstrated that the extracts from Epilobium angustifolium, Epilobium parviflorum and Epilobium hirsutum herbs are potent prostate cancer cells (LNCaP) proliferation inhibitors with IC50 values around 35 µg/ml. The tested extracts reduced prostate specific antigen (PSA) secretion (from 325.6 ± 25.3 ng/ml to ~90 ng/ml) and inhibited arginase activity (from 65.2 ± 1.1 mUnits of urea/mg of protein to ~40 mUnits of urea/mg protein). Selected constituents of extracts (oenothein B, quercetin-3-O-glucuronide, myricetin-3-O-rhamnoside) were proven to be active in relation to LNCaP cells. However, oenothein B was the strongest inhibitor of cells proliferation (IC50 = 7.8 ± 0.8 µM), PSA secretion (IC50 = 21.9 ± 3.2 µM) and arginase activity (IC50 = 19.2 ± 2.0 µM). Additionally, ellagitannins from E. hirustum extract were proven to be transformed by human gut microbiota into urolithins. Urolithin C showed the strongest activity in the inhibition of cell proliferation (IC50 = 35.2 ± 3.7 µM), PSA secretion (reduced PSA secretion to the level of 100.7 ± 31.0 ng/ml) and arginase activity (reduced to the level of 27.9 ± 3.3 mUnits of urea/mg of protein). Results of the work offer an explanation of the activity of Epilobium extracts and support the use of Epilobium preparations in the treatment of prostate diseases.

Synthesis of imperatorin analogs and their evaluation as acetylcholinesterase and butyrylcholinesterase inhibitors.

In this study, we synthesized several imperatorin analogs using imperatorin and xanthotoxin as substrates. The anti-cholinesterase activities of all compounds were evaluated in in vitro experiments according to the modified Ellman's method. For each synthesized compound, IC50 values for both enzymes were established. Galantamine hydrobromide was used as a positive control in the enzymatic experiments. All active compounds showed selectivity toward butyrylcholinesterase (BuChE) rather than acetylcholinesterase. The most active ones were 8-(3-methylbutoxy)-psoralen and 8-hexoxypsoralen with IC50 values for BuChE of around 16.5 and 16.4 µM, respectively. The results of our study may be considered as the beginning of a search for potential anti-Alzheimer's disease drugs based on the structure of natural furocoumarins.