Characteristics of the Cytotoxicity of Taraxacum mongolicum and Taraxacum formosanum in Human Breast Cancer Cells.

Breast cancer is a highly heterogeneous disease that has been clinically divided into three main subtypes: estrogen receptor (ER)- and progesterone receptor (PR)-positive, human epidermal growth factor receptor 2 (HER 2)-positive, and triple-negative breast cancer (TNBC). With its high metastatic potential and resistance to endocrine therapy, HER 2-targeted therapy, and chemotherapy, TNBC represents an enormous clinical challenge. The genus Taraxacum is used to treat breast cancer in traditional medicine. Here, we applied aqueous extracts from two Taraxacum species, T. mongolicum and T. formosanum, to compare their potential antitumor effects against three human breast cancer cell lines: MDA-MB-231 (ER-, PR-, and HER2-), ZR-75-1 (ER+, PR+/-, and HER2-), and MCF-7 (ER+, PR+, and HER2-). Our results show that T. mongolicum exerted cytotoxic effects against MDA-MB-231 cells, including the induction of apoptosis, the reduction of cell proliferation, the disruption of the mitochondrial membrane potential, and/or the downregulation of the oxygen consumption rate. Both T. mongolicum and T. formosanum decreased cell migration and colony formation in the three cell-lines and exerted suppressive effects on MCF-7 cell proliferation based on metabolic activity and BrdU incorporation, but an enhanced proliferation of ZR-75-1 cells based on BrdU incorporation. T. formosanum induced ribotoxic stress in MDA-MB-231and ZR-75-1 cells; T. mongolicum did not. In summary, these findings suggest that T. mongolicum showed greater cytotoxicity against all three tested breast cancer cell lines, especially the TNBC MDA-MB-231 cell line.

Korean red ginseng improves blood pressure stability in patients with intradialytic hypotension.

Introduction. Intradialytic hypotension (IDH) is a common complication during hemodialysis which may increase mortality risks. Low dose of Korean red ginseng (KRG) has been reported to increase blood pressure. Whether KRG can improve hemodynamic stability during hemodialysis has not been examined. Methods. The 8-week study consisted of two phases: observation phase and active treatment phase. According to prehemodialysis blood pressure (BP), 38 patients with IDH were divided into group A (BP ≥ 140/90 mmHg, n = 18) and group B (BP < 140/90 mmHg, n = 20). Patients were instructed to chew 3.5 gm KRG slices at each hemodialysis session during the 4-week treatment phase. Blood pressure changes, number of sessions disturbed by symptomatic IDH, plasma levels of vasoconstrictors, blood biochemistry, and adverse effects were recorded. Results. KRG significantly reduced the degree of blood pressure drop during hemodialysis (P < 0.05) and the frequency of symptomatic IDH (P < 0.05). More activation of vasoconstrictors (endothelin-1 and angiotensin II) during hemodialysis was found. The postdialytic levels of endothelin-1 and angiotensin II increased significantly (P < 0.01). Conclusion. Chewing KRG renders IDH patients better resistance to acute BP reduction during hemodialysis via activation of vasoconstrictors. Our results suggest that KRG could be an adjuvant treatment for IDH.

Anticancer Effects of Taraxacum via Cell Cycle Arrest, Necrosis, Apoptosis, and Endoplasmic Reticulum Stress.

Dandelion (Taraxacum species) is a wild plant with over 2500 species. Flavonoids, phenolic compounds, saponins, sesquiterpenes, and sugars have been detected in the organs of Taraxacum, and for centuries it has been used in traditional medicine for the relief and treatment of various diseases. However, details of its working mechanism remain unclear. Bioactive compounds in herbal extracts generally have low yields, which makes their isolation and purification intensive in terms of time and cost. Here, to assess their versatility and safety, we applied aqueous extracts of two species of Taraxacum, T. mongolicum and T. formosanum, including extracts of both fresh and dried T. formosanum, to compare their potential antitumor effects on HeLa human cervical cancer cells, three liver cancer cell lines, and one normal liver cell line. After being treated with a lower dose of Taraxacum, the upregulation of subG1 and S populations, as well as increased levels of p-eIF2[Formula: see text]-to-eIF2[Formula: see text] ratio, were observed in HeLa cells, whereas the downregulation of S population and the absence of mRNA expressions were detected in HeLa cells when being treated with a higher dose of Taraxacum. These results indicated that Taraxacumcould induce apoptosis and endoplasmic reticulum stress while suppressing proliferation, transcription, colony formation, migration, and invasion. What's more, we also found that the effects of fresh T. formosanum were much stronger than that of T. mongolicumin HeLa cells. Based on these results, we suggest that T. formosanum may contain specific compound(s) that are potentially useful for cancer therapy. However, much work remains to identify these effective compounds for the future application of Taraxacumto cancer therapy.

Ellagic Acid, the Active Compound of Phyllanthus urinaria, Exerts In Vivo Anti-Angiogenic Effect and Inhibits MMP-2 Activity.

This study aimed to assess the potential anti-angiogenic mechanism of Phyllanthus urinaria (P. urinaria) and characterize the major compound in P. urinaria that exerts anti-angiogenic effect. The water extract of P. urinaria and Ellagic Acid were used to evaluate the anti-angiogenic effect in chorioallantoic membrane (CAM) in chicken embryo and human vascular endothelial cells (HUVECs). The matrix metalloproteinase-2 (MMP-2) activity was determined by gelatin zymography. The mRNA expressions of MMP-2, MMP-14 and tissue inhibitor of metalloproteinase-2 (TIMP-2) were analyzed by reverse transcription polymerase chain reaction (RT-PCR). Level of MMP-2 proteins in conditioned medium or cytosol was determined by western blot analysis. We confirmed that P. urinaria's in vivo anti-angiogenic effect was associated with a reduction in MMP-2 activity. Ellagic acid, one of the major polyphenolic components as identified in P. urinaria by high performance liquid chromatography mass spectrometry (HPLC/MS), exhibited the same anti-angiogenic effect in vivo. Both P. urinaria and Ellagic Acid inhibited MMP-2 activity in HUVECs with unchanged mRNA level. The mRNA expression levels of MMP-14 and TIMP-2 were not altered either. Results from comparing the change of MMP-2 protein levels in conditioned medium and cytosol of HUVECs after the P. urinaria or Ellagic Acid treatment revealed an inhibitory effect on the secretion of MMP-2 protein. This study concluded that Ellagic Acid is the active compound in P. urinaria to exhibit anti-angiogenic activity and to inhibit the secretion of MMP-2 protein from HUVECs.

A system for reporting and evaluating adverse drug reactions of herbal medicine in Taiwan from 1998 to 2016.

The Taiwan Adverse Drug Reaction Reporting System for Herbal Medicine (TADRRS-HM) has systematically documented suspected adverse events from adverse drug reaction (ADR) reports from 1998 (prior to its formal establishment in 2001) and evaluates safety profiles of herbal medicines. This article describes findings from 2079 ADR reports filed between 1998 and 2016: 941 reports involved single herbs and 87 involved folk herbals; 842 were generated from clinical trials, while 209 ADR reports involving foods, health foods, dietary supplement foods and herbal cuisine were grouped as Other. Severity assessments using the Modified Hartwig and Siegel scale classified 72.4% of ADRs as mild, 17.4% as moderate and 6.5% as severe. System Organ Class classification of the ADRs identified gastrointestinal system disorders as the most common (33.4%), followed by skin and subcutaneous tissue disorders (21.2%). The TADRRS-HM records indicate that herbal medicines may cause a wide range of ADRs. Aconiti Radix, Xiao-Qing-Long-Tang, and Datura suaveolens were the most commonly reported single herb, herbal formula, and folk herbal, respectively. The data indicate that herbal medicines may cause a wide range of ADRs. This system will confer long-term benefits for the development of Taiwan's herbal medicines adverse reaction database and facilitate epidemiological analysis.

Gynostemma pentaphyllum decreases allergic reactions in a murine asthmatic model.

The increasing incidence of asthma in developing countries emphasizes the importance of identifying more effective treatments that have low cost. Gynostemma pentaphyllum (Thunb.) Makino (Cucurbitaceae), a common herbal tea in China, has been used to treat lung inflammation. Since the Th2 cytokines are the major mediators in the pathogenesis of asthma, Th1-biased immune responses caused by G. pentaphyllum might have the potential to relieve asthmatic symptoms. We hypothesized that oral administration of G. pentaphyllum extracts might suppress Th2 cytokine-induced airway inflammation responses in ovalbumin (OVA)-sensitive mice. BALB/c mice were sensitized with intraperitoneal injection and challenged 3 times with OVA inhalation (IH) (the IH3 model). G. pentaphyllum was orally administered for 7 consecutive days before the end of the OVA challenge. In the IH5 model, 2 more OVA challenges were administered to mimic the encounter with an allergen after drug treatment. G. pentaphyllum extracts significantly attenuated airway hyperresponsiveness (AHR) and inhibited eosinophil infiltration in mice in both models. Serum OVA-specific antibodies were also reduced with the treatment. Decreased Th2-type cytokines and increased IFN-gamma were detected in the cultures of OVA-activated splenocytes from treated mice. Our results suggest that G. pentaphyllum extracts might be beneficial for asthma airway inflammation through the suppression of Th2 activity.

Extract of Gynostemma pentaphyllum enhanced the production of antibodies and cytokines in mice.

Gynostemma pentaphyllum is a popular herbal tea in China and some Asian countries. The modulatory function of G. pentaphyllum total plant extracts on immune cells was evaluated in this study. The extract was intraperitoneally injected into mice for 5 consecutive days. The production of antibodies from B cells or cytokines from T cells was determined mainly with ELISA. After the treatment, serum IgM and IgG2a were significantly enhanced and showed dose-dependent effect. Moreover, serum IgA and IgG1 were also increased when received the extract at the doses of 0.05 or 0.50 g/kg/day. In addition to the serum levels, the injection of the extract enhanced the production of all antibodies from LPS-activated spleen cells. Furthermore, more cytokines were secreted from Con A-stimulated splenocytes of G. pentaphyllum-treated mice. Our results suggest that the extract of G. pentaphyllum might promote immune responses through the activation of T and B cells.

Anti-tumor and anti-angiogenic effects of Phyllanthus urinaria in mice bearing Lewis lung carcinoma.

Phyllanthus urinaria, a widely used herb medicine in Asia, was tested for its anti-tumor effect in vivo for the first time. The anti-tumor activity in P. urinaria extract was evaluated by its effect on tumor developed in C57BL/6J mice with implantation of Lewis lung carcinoma cells. The oral administration of P. urinaria to mice caused significant inhibition of tumor development with lower occurrence rate and markedly reduced tumor size. Neither the total body weight of mouse nor the weights of organs including heart, lung, liver, spleen and kidney revealed any difference between two groups, suggesting limited in vivo cytotoxic effect of P. urinaria in mice. TUNEL assay demonstrated the increase of apoptosis in tumor sections prepared from P. urinaria-treated mice compared with control mice. It is worth of note that the neovascularization in tumor was inhibited in P. urinaria-treated mice, which implicated the potential anti-angiogenic effect of P. urinaria. Further study using an in vitro matrix-induced tube formation of HUVECs again confirmed the anti-angiogenic action of P. urinaria. P. urinaria exerted no inhibitory effect on the growth of HUVECs, however, the migration of HUVECs as analyzed using transwell assay was suppressed markedly by P. urinaria in a dose-dependent manner. All together, the present study indicated that P. urinaria extract is an anti-tumor and anti-angiogenic agent, which can be used safely in animals.

Regulation of fibronectin by thyroid hormone receptors.

Thyroid hormones regulate growth, development, differentiation, and metabolic processes by interacting with and activating thyroid hormone receptors and associated pathways. We investigated the triiodothyronine (T3) modulation of gene expression, in human hepatocellular carcinoma cell lines, via a PCR-based cDNA subtraction method. Here we present further data on one of the T3-upregulated genes, fibronectin (FN). We demonstrate that the induction of FN protein expression by T3 in TRalpha1 and TRbeta1 over-expressing cells was time and dose-dependent at the mRNA and protein levels. Blockade of protein synthesis by cycloheximide almost completely inhibited the concomitant induction of FN mRNA by T3, indicating that T3 indirectly regulates FN. Furthermore, nuclear-run on and FN promoter assay clearly can specifically increase the number of FN transcriptional demonstrated that the presence of T3 initiations. In addition, we further confirmed that the up-regulation of FN by T3 was mediated, at least in part, by transforming growth factor-beta (TGF-beta), because the induction of FN was blocked in a dose-dependent manner by the addition of TGF-beta neutralizing antibody. In an effort to elucidate the we demonstrated the involvement of the signaling pathways involved in the activation of FN by T3, mitogen activated protein kinase/c-Jun N-terminal kinase/p38 MAPK (MAPK/JNK/p38) pathway. Although T3 induces the expression of TGF-beta, neither wild-type nor dominant-negative Smad3 or Smad4 over-expression affected the activation of FN by T3. Thus, we demonstrate that T3 regulates FN gene expression indirectly at the transcriptional level, with the participation of the MAPK/JNK/p38 pathway and the TGF-beta signaling pathway but independent of Smad3/4.

Phyllanthus urinaria triggers the apoptosis and Bcl-2 down-regulation in Lewis lung carcinoma cells.

Phyllanthus urinaria (P. urinaria), a widely used herb medicine, was tested for the anticancer effect in its water extract for the first time. The water extract of P. urinaria significantly decreased the number of Lewis lung carcinoma cells in a dose-and time-dependent manner as determined by MTT assay. However, the water extract of P. urinaria did not exert any cytotoxic effect on normal cells such as endothelial cells and liver cells. Result from flow cytometry revealed a dose-dependent increase of dead cells 24 hours after treating Lewis lung carcinoma cells with P. urinaria extract. The anticancer activity of P. urinaria extract was due to the apoptosis induced in Lewis lung carcinoma cells, which was demonstrated by DNA fragmentation analysis and increased caspase-3 activity. The apoptosis triggered by P. urinaria extract in Lewis lung carcinoma cells was associated with the down-regulation of Bcl-2 gene expression, but not with p53, p21 and Bax. Furthermore, the partial inhibition of P. urinaria-induced apoptosis in Lewis lung carcinoma cells by pretreatment with cyclosporin A, a mitochondria permeability transition pore inhibitor, suggesting that P. urinaria extract induced the apoptosis of Lewis lung carcinoma cells, at least in part, through a mitochondria-associated intrinsic pathway.

Phyllanthus urinaria induces the Fas receptor/ligand expression and ceramide-mediated apoptosis in HL-60 cells.

Phyllanthus urinaria (P. urinaria), a widely used herb medicine, was tested for the anticancer effect on human myeloid leukemia cells in this study. The water extract of P. urinaria induced the apoptosis of HL-60 cells as demonstrated by morphological change, DNA fragmentation and increased caspase-3 activity. However, normal human peripheral mononuclear cells remained viable under the same treatment. The P. urinaria-induced apoptosis of HL-60 cells was associated with the increased Bax gene expression and decreased Bcl-2 gene expression. In addition, the gene expressions of Fas receptor and Fas ligand, but not p53, were also induced in HL-60 cells dose- and time-dependently. The inhibitor of ceramide synthase, fumonisin B1, completely suppressed the apoptosis induced by P. urinaria and this inhibitory effect of fumonisin B1 could be eliminated by the addition of ceramide. It indicated that the activity of ceramide synthase is critical for the P. urinaria-induced apoptosis in HL-60 cells. The P. urinaria-induced apoptosis in HL-60 cells is mediated through a ceramide-related pathway.

Aqueous extract of Phyllanthus urinaria induces apoptosis in human cancer cells.

Cell apoptosis is now known to play an important role in the maintenance of cellular homeostasis and anti-carcinogenesis. The anticancer effect of aqueous extract prepared from Phyllanthus urinaria (P. urinaria) was investigated by analyzing its potential to induce apoptosis in human cancer cells. We showed that the aqueous extract of P. urinaria could reduce the viability by inducing the apoptosis in human cancer cells derived from several different origins as demonstrated by morphological changes and DNA fragmentation. Yet, P. urinaria extract exhibited no cytotoxic effect on normal human cells, including vascular endothelial cells and liver cells under the same conditions. It suggests that the aqueous extract of P. urinaria is substantially useful in treating various kinds of human cancer cells without toxic side effect on normal cells.

Davallia bilabiata inhibits TNF-α-induced adhesion molecules and chemokines by suppressing IKK/NF-kappa B pathway in vascular endothelial cells.

Davallia bilabiata (D. bilabiata) is also called GuSuiBu in Taiwan and is used as a substitute for Drynaria fortunei J. Sm. It is often used for trauma and bone repair. The inhibitory effect of D. bilabiata on inflammatory activity has not been reported. In the present study, we aimed to study the mechanism of anti-inflammation of D. bilabiata on the adhesion of leukocytes to vascular endothelial cells. The results showed that D. bilabiata, at concentrations without cytotoxic effect, inhibited the adhesion of monocytes (THP-1) to the TNF-α-stimulated human umbilical vascular endothelial cells (HUVECs). D. bilabiata suppressed the expression of the adhesion molecules ICAM, VCAM, and E-selectin at both the mRNA and protein level. In addition, both of the TNF-α-induced mRNA and protein expression of chemokines including fractalkine/CX3CL1, MCP-1 and RANTES as well as the level of secreted soluble fractalkine were decreased by D. bilabiata. We also verified that D. bilabiata inhibited the TNF-α-induced nuclear translocation of NF-κB through the inhibitory process on the TNF-α-activated phosphorylation of IKKα, IKKß, IκB and NF-κB. All together, we concluded that the D. bilabiata affected the canonical pathway of TNF-α-induced NF-κB activation and down-regulated cell adhesion molecules and chemokine expression through inhibition of the NF-κB/IκBα/IKK signaling pathway. These findings strongly indicated that D. bilabiata might be a promising alternative/adjunct treatment for inflammatory diseases, such as rheumatoid arthritis and osteoarthritis.

Anti-angiogenic effect of Tanshinone IIA involves inhibition of matrix invasion and modification of MMP-2/TIMP-2 secretion in vascular endothelial cells.

Tanshinone IIA (Tan IIA) is one of the major lipophilic components of Salvia miltiorrhiza Bunge reported to exhibit anti-carcinogenic effect. In the present study, we further evaluated the anti-angiogenic effect of Tan IIA using the chorioallantoic membrane (CAM) in chicken embryos and human umbilical vascular endothelial cells (HUVECs). Tan IIA was confirmed to inhibit in vivo angiogenesis by CAM assay. Tan IIA also exhibited in vitro anti-angiogenic effects as demonstrated by tube formation assay, transwell migration assay and TNF-α-induced matrix invasion assay. The mRNA expressions of matrix metalloproteinase-2, -3, -9, -14 (MMP-2, -3, -9, -14), tissue inhibitor of metalloproteinase-2 (TIMP-2) and reversion-inducing cysteine-rich protein with kazal motifs (RECK) were not affected by Tan IIA as analyzed by reverse transcription polymerase chain reaction (RT-PCR). However, the extracellular matrix metalloproteinase-2 (MMP-2) activity was found to be reduced dose-dependently by Tan IIA as determined by gelatin zymography. Results from western blot analysis and ELISA further demonstrated the dose-dependent decrease of MMP-2 and increase of TIMP-2 secretion from cytosol of vascular endothelial cells simultaneously after Tan IIA treatment. Together, the present study confirmed the anti-angiogenic effects of Tan IIA both in vivo and in vitro. Our results also demonstrated that Tan IIA could modulate the secretion of MMP-2 and TIMP-2 in an opposite way and resulted in the decreased MMP-2 activity of vascular endothelial cells.

Zinc-chelation contributes to the anti-angiogenic effect of ellagic acid on inhibiting MMP-2 activity, cell migration and tube formation.

BACKGROUND: Ellagic acid (EA), a dietary polyphenolic compound, has been demonstrated to exert anti-angiogenic effect but the detailed mechanism is not yet fully understood. The aim of this study was to investigate whether the zinc chelating activity of EA contributed to its anti-angiogenic effect. METHODS AND PRINCIPAL FINDINGS: The matrix metalloproteinases-2 (MMP-2) activity, a zinc-required reaction, was directly inhibited by EA as examined by gelatin zymography, which was reversed dose-dependently by adding zinc chloride. In addition, EA was demonstrated to inhibit the secretion of MMP-2 from human umbilical vein endothelial cells (HUVECs) as analyzed by Western blot method, which was also reversed by the addition of zinc chloride. Reversion-inducing cysteine-rich protein with Kazal motifs (RECK), known to down-regulate the MMP-2 activity, was induced by EA at both the mRNA and protein levels which was correlated well with the inhibition of MMP-2 activity. Interestingly, zinc chloride could also abolish the increase of EA-induced RECK expression. The anti-angiogenic effect of EA was further confirmed to inhibit matrix-induced tube formation of endothelial cells. The migration of endothelial cells as analyzed by transwell filter assay was suppressed markedly by EA dose-dependently as well. Zinc chloride could reverse these two effects of EA also in a dose-dependent manner. Since magnesium chloride or calcium chloride could not reverse the inhibitory effect of EA, zinc was found to be involved in tube formation and migration of vascular endothelial cells. CONCLUSIONS/SIGNIFICANCE: Together these results demonstrated that the zinc chelation of EA is involved in its anti-angiogenic effects by inhibiting MMP-2 activity, tube formation and cell migration of vascular endothelial cells. The role of zinc was confirmed to be important in the process of angiogenesis.

Anti-cancer effects of Phyllanthus urinaria and relevant mechanisms.

Phyllanthus urinaria (P. urinaria), a widely used herbal medicine, has been reported to possess various biological activities. This report aimed to characterize the whole P. urinaria plant, present the anticancer effects of P. urinaria both in vivo and in vitro, and explore relevant mechanisms. The water extract of P. urinaria not only significantly reduces the cell viability of various cancer cell lines from different origins but also suppresses tumor development in C57BL/6J mice after implantation of Lewis lung carcinoma (LCC) cells. The anticancer activity of P. urinaria extract is mainly due to induced apoptosis of cancer cells as demonstrated by DNA fragmentation and increased caspase-3 activity through both intrinsic and extrinsic pathways. The decrease in viability with P. urinaria treatment might be partially associated with down-regulation of telomerase activation and induction of the apoptotic process. In addition, P. urinaria also exhibits anti-angiogenic activity that is mediated, at least in part, by suppression of matrix metalloproteinase 2 (MMP-2) secretion and inhibition of MMP-2 activity through zinc chelation.

Long-term oral administration of Gynostemma pentaphyllum extract attenuates airway inflammation and Th2 cell activities in ovalbumin-sensitized mice.

Our previous report demonstrated that the oral administration of short-term high dose Gynostemma pentaphyllum extract (5 g/kg per day for 7days) decreased allergic reactions in ovalbumin (OVA)-sensitized mice. The aim of this study was to determine whether long-term oral administration of G. pentaphyllum attenuated airway inflammation in OVA-sensitized mice. Mice were sensitized and challenged with normal saline or OVA. OVA-sensitized mice were fed with 1.75 g/kg (low dose, GPL) or 5 g/kg (high dose, GPH) G. pentaphyllum extract, five days a week for 4 weeks. The airway hyperresponsiveness (AHR) and eosinophilia in bronchoalveolar lavage fluid (BALF) were examined. The cytokine levels or antibodies in BALF, serum and spleen cell culture supernatants were also determined. Both high and low dose extracts reduced AHR, serum OVA-IgE, and Th2-associated cytokine levels in spleen cell supernatants and BALF in OVA-sensitized mice. These results show that long-term orally administered G. pentaphyllum extract reduced allergic reactions in OVA-sensitized mice.

Wogonin, an active compound in Scutellaria baicalensis, induces apoptosis and reduces telomerase activity in the HL-60 leukemia cells.

Crude extract of Scutellaria baicalensis (S. baicalensis) has cytotoxic effect on human myelogenous leukemia cells (HL-60). We invesigated which compound from the crude extract is responsible for the cytotoxic effect on HL-60 cells. We identified 29 compounds from the crude extract using high performance liquid chromatography mass spectrometry (HPLC/MS). Two of the compounds, baicalin and wogonoside, are converted to baicalein and wogonin, respectively, after treatment with beta-glucuronidase. We observed a dose-dependent reduction in cell viability when cells with either wogonin or aqueous extract of S. baicalensis. Several of the apoptotic features including deoxyribonucleic acid (DNA) fragmentation and increased caspase-3 activity were found in cells treated with wogonin and aqueous extract. The changes were associated with down-regulation of Bcl-2, and not Bax. Furthermore, treatment of HL-60 cells with wogonin or S. baicalensis led to the inhibition of human telomerase reverse transcriptase (hTERT), human telomerase-associated protein 1 (hTP1) and c-myc messenger ribonucleic acid (m-RNA) expression. Wogonin and S. baicaleisis down-regulated the telomerase activity. Our findings suggest that wogonin may be the major compound in S. baicalensis responsible for HL-60 growth inhibition in vitro. The inhibition of HL-60 cell growth is mediated partly through the induction of Bax/Bcl-2 apoptosis and by telomerase inhibition through suppression of c-myc, which is a promoter of hTERT.

Phyllanthus urinaria increases apoptosis and reduces telomerase activity in human nasopharyngeal carcinoma cells.

BACKGROUND: This study was designed to obtain the chemical fingerprint and to investigate the effect of Phyllanthus urinaria on telomerase activity and apoptotic pathways in the human nasopharyngeal carcinoma cell line (NPC-BM1). MATERIALS AND METHODS: The polyphenol compounds in P. urinaria were investigated by HPLC/MS. Cell viability with the treatment of P. urinaria, gallic acid, ellagic acid, quercetin and cisplatin was detected by MTT assay. TUNEL assay, DNA fragmentation analysis and caspase3 activity were used to confirm apoptotic changes. Telomerase activity was determined using the TRAP assay. RNA isolation and RT-PCR were used to analyze the related genes expression. All experiments on treatments with P. urinaria from 0-3 mg/ml were carried out for 24 h. RESULTS: 5 major compounds including gallic acid, brevifolin carboxylic acid, corilagin, phyllanthusiin C and ellagic acid were identified as a plant fingerprint by HPLC/MS. With the MTT assay, we demonstrated that P. urinaria, gallic acid and ellagic acid reduce cell viability. The apoptosis features showed DNA fragmentation and increased caspase-3 activity associated with the down-regulation of Bcl-2, but not of Bax, p53, and PCNA (proliferating cell nuclear antigen) in P. urinaria-treated NPC-BM1 cells. Furthermore, treatment of NPC-BM1 cells led to an inhibition of hTERT (human telomerase reverse transcriptase), hTP1 (human telomerase-associated protein 1) and c-myc mRNA expression and to decreased telomerase activity. CONCLUSION: This study suggests that P. urinaria induces the death of NPC-BM1 cells in vitro through the induction of apoptosis and inhibited telomerase activity.