Formulating 10-hydroxycamptothecin into nanoemulsion with functional excipient tributyrin: An innovative strategy for targeted hepatic cancer chemotherapy

This study aimed to develop an innovative dosage form for 10-hydroxycamptothecin (HCPT), a chemotherapeutic agent with limited aqueous solubility and stability, to enhance its parenteral delivery and targeting to hepatic cancer. We formulated HCPT into a nanoemulsion using tributyrin, a dietary component with histone deacetylase inhibitor activity. The resulting HCPT-loaded tributyrin nanoemulsion (Tri-HCPT-E) underwent extensive evaluations. Tri-HCPT-E significantly improved the aqueous solubility, stability, and anti-cancer activities in HepG2 cells. Pharmacokinetic studies confirmed the increased stability and hepatic targeting, with Tri-HCPT-E leading to a 120-fold increase in plasma exposure of intact HCPT and a 10-fold increase in hepatic exposure compared to the commercial free solution. Co-administration of 17α-ethynylestradiol, an up-regulator of low-density lipoprotein (LDL) receptor, further enhanced the distribution and metabolism of HCPT, demonstrating an association between the LDL receptor pathway and hepatic targeting. Most importantly, Tri-HCPT-E exhibited superior in vivo anti-cancer efficacy in a mouse xenograft model compared to the commercial formulation, without causing escalated hepatic or renal toxicity. In conclusion, formulating HCPT into a nanoemulsion with tributyrin has proven to be an innovative and effective strategy for targeted hepatic cancer chemotherapy while tributyrin, a pharmacologically active dietary component, has emerged as a promising functional excipient for drug delivery.

The intramolecular SN2 reaction tautomeric ent-Kauranoids isolated from the aerial parts of Isodon amethystoides

As our ongoing searching for the bioactive natural terpenoids, nine ent-kauranoids (1-9), including three previously undescribed ones (1, 2, and 9), were isolated from the aerial parts of Isodon amethystoides. Their structures were elucidated on the basis of spectroscopic data analysis, including NMR, MS, and ECD. Compounds 1 and 2 were a pair of tautomeric compounds, which was confirmed by the HPLC analysis and low temperature NMR testing. The underlying mechanism of the tautomer was proposed as an intramolecular SN2 reaction, which was explained by quantum chemical calculation. The HOMO-LUMO gap and the free energy revealed the spontaneous of the tautomeric of the 1 and 2. Additionally, the similar phenomena were also found in the two groups of known compounds 3 and 4 and 6 and 7, respectively. Apart from the tautomer, compounds 3 and 4 can be hydrolyzed into 5 through ester hydrolysis in CDCl3, while compounds 6, 7 can be hydrolyzed into 8 through ester hydrolysis. These phenomena were also confirmed through HPLC analysis and low temperature nuclear magnetic resonance tests and the mechanism was studied using quantum chemical calculation.

Impact of institutional interventions on the rate of paclitaxel hypersensitivity reactions

PURPOSE

Paclitaxel is associated with hypersensitivity reactions (HSRs). Intravenous premedication regimens have been devised to decrease the incidence and severity of HSRs. At our institution oral histamine 1 receptor antagonists (H1RA) and histamine 2 receptor antagonists (H2RA) were adopted as standard. Standardizations were implemented for consistent premedication use in all disease states. The purpose of this retrospective study was to compare the incidence and severity of HSRs before and after standardization.

METHODS

Patients who received paclitaxel from 20 April 2018 to 8 December 2020 having an HSR were included in analysis. An infusion was flagged for review if a rescue medication was administered after the start of the paclitaxel infusion. The incidences of all HSR prior to and post-standardization were compared. A subgroup analysis of patients receiving paclitaxel for the first and second time was performed.

RESULTS

There were 3499infusions in the pre-standardization group and 1159infusions in the post-standardization group. After review, 100 HSRs pre-standardization and 38 HSRs post-standardization were confirmed reactions. The rate of overall HSRs was 2.9% in the pre-standardization group and 3.3% in the post-standardization group (p = 0.48). HSRs, during the first and second doses of paclitaxel, occurred in 10.2% of the pre-standardization and 8.5% of the post-standardization group (p = 0.55).

CONCLUSIONS

This retrospective interventional study demonstrated that same-day intravenous dexamethasone, oral H1RA, and oral H2RA are safe premedication regimens for paclitaxel. No change in the severity of reactions was seen. Overall, better adherence to premedication administration was seen post-standardization.

Sulfur dioxide-releasing polymeric micelles based on modified hyaluronic acid for combined cancer therapy

In this study, an amphiphilic polymer mPEG-HA(SA)-DNs was designed and synthesized to fabricate a multifunctional micellar system to enhance the therapeutic efficacy and reduce the toxic effect of paclitaxel (PTX). The polymer was prepared by introducing mPEG, stearic acid (SA) and 2,4-dinitrobenzenesulfonic acid (DNs) to the backbone of hyaluronic acid (HA). With above modifications, the fabricated micelles could encapsulate PTX in the core with high drug loading. The optimized PTX-loaded micelles had a mean size of 158.3 nm. Upon the effect of mPEG, the mPEG-HA(SA)-DNs micelles reduced the non-specific protein adsorption. In vitro drug release study revealed the excellent glutathione (GSH)-triggered PTX release behavior of the micelles. Moreover, GSH could trigger the detachment of DNs segment from mPEG-HA(SA)-DNs, and result in the release of SO2. In vitro and in vivo antitumor efficacy studies demonstrated that the PTX-loaded mPEG-HA(SA)-DNs micelles exhibited outstanding tumor suppression effect. The micelles would be potential carriers for combination cancer therapy by SO2 and PTX.

Bioactive diterpenoids isolated from the twigs and leaves of Casearia velutina

Nine previously undescribed clerodane-type diterpenoids (1-9), named caseabalanspenes A-I, along with six know compounds (10-15), were isolated from the twigs and leaves of Casearia velutina. Spectroscopic data (1D and 2D NMR) analysis permitted the definition of their structures and then determination of the molecular formula of the compound by high resolution mass spectrometry (HR-ESI-MS). It is worth noting that compound 7 contains N- heterocycle. Compounds 1-8 were tested the anti-inflammasome activity, and compound 3 exhibited potent activity and decreased LDH level in a dose-dependent manner, with IC50 values of 2.90 μM.

Do Naturally Modified Nucleotides Contribute to Stabilizing Complexes between Ribosomes and Small Molecules? A Case Study with the Antitumor Drug Homoharringtonine

Modified nucleotides are ubiquitous with RNAs, also in contact with drugs that target the ribosome. Whether this represents a stabilization of the drug-ribosome complex, thus affecting the drug's affinity and possibly also intrinsic efficacy, remains an open question, however. The challenge of answering this question has been taken here with the only human-ribosome-targeting small-molecule currently in clinical use, the antitumor plant alkaloid homoharringtonine (HHT). The approach consisted in dissecting HHT-nucleotide interaction energies from QM-MM simulations in explicit water. What emerged is a network of mostly weak interactions of the large, branched HHT with standard nucleotides and a single modified nucleotide, out of the four ones present at PCT's A site. This is unlike the case of the small, compact marine antitumor alkaloid agelastatin A, which displays only a few, albeit strong, interactions with site-A ribosome nucleotides. This should aid tailoring drugs targeting the ribosome.

Impact of histamine-2 antagonist shortage on the incidence of hypersensitivity reactions to paclitaxel: a reconsideration of premedication protocols in France (PACLIREACT Study)

PURPOSE

An international shortage of ranitidine led to adjustments in premedication regimens for paclitaxel-based chemotherapy in early October 2019. In this study, we implemented and evaluated an anti-allergic protocol without histamine-2 antagonists (H2As) and aimed to assess the risk of hypersensitivity reactions (HSRs) to the different premedication regimens used.

METHODS

We conducted a single-center observational retrospective study of paclitaxel administrations (7173 administrations in 831 patients). Between January 2019 and December 2020, all allergies reported were recorded. A mixed logistic regression model was implemented to predict the risk of allergy at each injection and to account for repeated administration per patient.

RESULTS

A total of 27 HSRs occurred in 24 patients. No protective effect was observed for H2A when comparing paclitaxel injections with H2A premedication versus without H2A (OR = 1.12, p = 0.84). There was also no significant difference in risk of HSR for famotidine versus ranitidine (OR = 0.79, p = 0.78). However, the risk of HSRs was significantly lower for paclitaxel injections with corticosteroids than for those without (OR = 0.08, p = 0.03). In addition, the risk of HSR was significantly higher for the first, second, or third paclitaxel injections than for the subsequent injections (OR = 10.1, p < 0.001).

CONCLUSION

We did not find substantial evidence of an increased risk of HSR due to the absence of H2A in the premedication protocols for paclitaxel. Thus, in contrary to the existing literature on paclitaxel, our findings support the use of a premedication protocol without H2A.

The Antioxidant Potential of Graviola and Its Potential Medicinal Application

Graviola (Annunona muricata L.), a plant growing in tropical regions, has many names and a range of ethnomedicinal uses. The leaves are used to treat insomnia, diabetes, cystitis, and headaches, the crushed seeds have anthelmintic properties, and the fruits are used in the preparation of ice creams, candy, syrups, shakes, and other beverages. The key active components are believed to be annonaceous acetogenins, with more than 100 such compounds having been isolated from A. muricata. The plant is also a source of a range of phenolic compounds, essential oils, alkaloids, flavonol triglycosides, and megastigmanes, together with various minerals, including Mg, Fe, Cu, K, and Ca. Its key phenolic compounds are rutin, kaempferol, and quercetin. This paper provides an overview of the current state of knowledge about the antioxidant properties of various graviola organs and their major constituents, based on a review of various electronic databases. However, few findings have been obtained from clinical trials, and few in vitro and animal studies suggest that graviola preparations have antioxidant properties; as such, the antioxidant potential of graviola, and its safety, remain unclear.

Anti-inflammatory and cytotoxic specialised metabolites from the leaves of Glandularia × hybrida

In our ongoing effort to investigate active specialised metabolites from genus Glandularia, phytochemical studies on the ethanolic extract of Glandularia × hybrida (Groenl. & Rümpler) G.L. Nesom & Pruski leaves resulted in the isolation of three undescribed compounds, a dibenzylbutyrolactolic lignan and two echinocystic acid based triterpenoid saponins, in addition to two known compounds. Interestingly, this study reports isolation of chemo-systematically valuable specialised metabolites for the first time from the genus under investigation. Additionally, the isolated metabolites were evaluated for their iNOS inhibition and cytotoxic activities using a combination of in silico and in vitro studies. The pharmacokinetics properties (ADMET) of some of the isolated compounds were determined using pkCSM-pharmacokinetics server. Molecular docking analysis showed that saponin compound possesses higher negative score (-9.59 kcal/mol) than the lignan compound (-6.56 kcal/mol). The isolated compounds also showed iNOS inhibition activity with IC₅₀ values ranging between 6.6 and 49.7 μM and significant cytotoxic activity against a series of cell lines including SK-MEL, KB, BT-549, SK-OV-3, LLC-PK1 and VERO cells. Hence, this study reveals that specialised metabolites from G. hybrida plant are of significant anti-inflammatory and cytotoxicity potentials.

Evaluation of the effects of Ipomoea staphylina on ovarian cancer cell line

Ovarine cancer is a common woman malignancy in the world. Majority of the ovarian cancers are originated in the epithelial region which are lack of symptomps and this type of cancer is often get localized, when the tumour has spread outside the pelvis. Based on this context, the present study evaluated the effects of both aqueous and ethanolic extracts of Ipomoea staphylina leaves on ovarian cancer cell line. The SKOV-3 ovarian cancer cell line was used for evaluation of the effects of both extracts. Both extracts showed IC₅₀ effects on ovarian cancer cell lines as sensitivity index (SI) for both extracts were recorded to above 1.iFurther, ethanol extract was more effective in the moderation of gene expressions of matrix metalloproteinase-2 (MMP-2) and matrix metalloproteinase-9 (MMP-9) in comparison to aqueous extract. Further, morphological changes of SKOV-3 cells after treatment with both extracts also confirmed the results. The study, therefore, concludes that the ethanolic extract of Ipomoea staphylina leaves is more effective against ovarian cancer cell line.

Bioequivalence assessment of high-capacity polymeric micelle nanoformulation of paclitaxel and Abraxane® in rodent and non-human primate models using a stable isotope tracer assay

The in vivo fate of nanoformulated drugs is governed by the physicochemical properties of the drug and the functionality of nanocarriers. Nanoformulations such as polymeric micelles, which physically encapsulate poorly soluble drugs, release their payload into the bloodstream during systemic circulation. This results in three distinct fractions of the drug-nanomedicine: encapsulated, protein-bound, and free drug. Having a thorough understanding of the pharmacokinetic (PK) profiles of each fraction is essential to elucidate mechanisms of nanomedicine-driven changes in drug exposure and PK/PD relationships pharmacodynamic activity. Here, we present a comprehensive preclinical assessment of the poly (2-oxazoline)-based polymeric micelle of paclitaxel (PTX) (POXOL hl-PM), including bioequivalence comparison to the clinically approved paclitaxel nanomedicine, Abraxane®. Physicochemical characterization and toxicity analysis of POXOL hl-PM was conducted using standardized protocols by the Nanotechnology Characterization Laboratory (NCL). The bioequivalence of POXOL hl-PM to Abraxane® was evaluated in rats and rhesus macaques using the NCL's established stable isotope tracer ultrafiltration assay (SITUA) to delineate the plasma PK of each PTX fraction. The SITUA study revealed that POXOL hl-PM and Abraxane® had comparable PK profiles not only for total PTX but also for the distinct drug fractions, suggesting bioequivalence in given animal models. The comprehensive preclinical evaluation of POXOL hl-PM in this study showcases a series of widely applicable standardized studies by NCL for assessing nanoformulations prior to clinical investigation.

Euphorfinoids E-L: Diterpenoids from the roots of Euphorbia fischeriana with acetylcholinesterase inhibitory activity

Eight undescribed diterpenoids, euphorfinoids E-L, together with twelve known analogues, were isolated from the roots of wild Euphorbia fischeriana. Their structures and absolute configurations were elucidated by a combination of NMR, MS, ECD, and X-ray diffraction analyses. The plausible biosynthetic pathway of 1 was also proposed. The isolated compounds displayed moderate inhibitory activity against acetylcholinesterase (AChE) with 50% inhibiting concentration (IC₅₀) values of 6.23-192.38 μM.

Uncomfortably numb: how Nav1.7 mediates paclitaxel-induced peripheral neuropathy

This scientific commentary refers to ‘Paclitaxel increases axonal localization and vesicular trafficking of Nav1.7’ by Akin et al. (doi: 10.1093/brain/awab113).

Antimicrobial ent-abietane-type diterpenoids from the roots of Euphorbia wallichii

Three previously undescribed ent-abietane-type diterpenoids, designated as 11β-hydroxy-14-oxo-17-al-ent-abieta-8(9),13(15)-dien-16,12β-olide (1), 11β,17-dihydroxy-12-methoxy-ent-abieta-8(14),13(15)-dien-16,12ɑ-olide (2), and 14ɑ-hydroxy-17-al-ent-abieta-7(8),11(12),13(15)-trien-16,12-olide (3), were isolated from 95% ethanol extract of the roots of Euphorbia wallichii. The structures of the new compounds were elucidated by spectroscopic analysis (NMR, IR, UV, and MS). The isolated diterpenoids were tested in vitro for antimicrobial potentials against 6 pathogenic microorganisms. As a result, compounds 1-3 exhibited some antimicrobial activity against the tested Gram positive bacteria with minimum inhibitory concentration values less than 60 μg/ml.[Formula: see text].

Natural Phytochemicals Derived from Gymnosperms in the Prevention and Treatment of Cancers

The incidence of various types of cancer is increasing globally. To reduce the critical side effects of cancer chemotherapy, naturally derived compounds have been considered for cancer treatment. Gymnosperms are a group of plants found worldwide that have traditionally been used for therapeutic applications. Paclitaxel is a commercially available anticancer drug derived from gymnosperms. Other natural compounds with anticancer activities, such as pinostrobin and pinocembrin, are extracted from pine heartwood, and pycnogenol and enzogenol from pine bark. Gymnosperms have great potential for further study for the discovery of new anticancer compounds. This review aims to provide a rational understanding and the latest developments in potential anticancer compounds derived from gymnosperms.

Momordin Ic induces G0/1 phase arrest and apoptosis in colon cancer cells by suppressing SENP1/c-MYC signaling pathway

Momordin Ic (MI) is a natural pentacyclic triterpenoid enriched in various Chinese natural medicines such as the fruit of Kochia scoparia (L.) Schrad. Studies have shown that MI presents antitumor properties in liver and prostate cancers. However, the activity and potential mechanisms of MI against colorectal cancer remain elusive. Here, we showed that MI inhibited cell proliferation with G0/1 phase cell cycle arrest in colon cancer cells. Moreover, it was observed that MI increased apoptosis compared to untreated cells. Further investigation showed that the SUMOylation of c-Myc was enhanced by MI and led to the down-regulated protein level of c-Myc, which is involved in regulating cell proliferation and apoptosis. SENP1 has been demonstrated to be critical for the SUMOylation of c-Myc. Meanwhile, knockdown of SENP1 by siRNA abolished the effects of MI on c-Myc level and cell viability in colon cancer cells. Together, these results revealed that MI exerted an anti-tumor activity in colon cancer cells via SENP1/c-Myc signaling pathway. These finding provide an insight into the potential of MI for colon cancer therapy.

Antiproliferative activity of standardized phytopreparations from Ibervillea sonorae (S. Watson) Greene

Ibervillea sonorae (Cucurbitaceae) is a medicinal plant utilized in Northwest Mexico against Diabetes and cancer. This natural product is taken orally, its presentation is capsules containing the plant's dried and powdered caudices. There is no regulation or standardized dosage that allows reproducibility of its pharmacological effects. Cucurbitacins are the main group of compounds found in I. sonorae and are known for their antiproliferative activity in cancer cells. Cucurbitacin IIb (CIIb), one of the compounds present in I. sonorae, has demonstrated in experimental models with HeLa cervical cancer cells an apoptotic and anti-tumoral activity. The objective of this study is to obtain and standardize two phytopreparations of I. sonorae based on their CIIb content, evaluate their antiproliferative activity in cancer cell lines, and compare the results with those obtained with CIIb; expecting to find phytopreparations with anti-cancer potential. APCI-IT-MSn is utilized for the identification of cucurbitacins, FT-ICR-MS/MS for the quantification of CIIb, and the MTT assay for the evaluation of the antiproliferative activity. The CIIb content was 0.67% for Fito-Ison-EtOH and 1.84% for Fito-Ison-EtOAc. In both phytopreparations, six cucurbitacins have been identified, and a seventh one not previously identified. Phytopreparations were more effective against HeLa, with IC₅₀ of 30.0 and 18.6 µg/mL for Fito-Ison-EtOH and Fito-Ison-EtOAc, respectively. This effect is lower than observed on CIIb in HeLa (5.8 µg/mL). There are no significant differences (p > 0.05) in the antiproliferative activity between Fito-Ison-EtOAc and CIIb in A549, LS180, and MDA-MB-231 cells. Phytopreparations of I. sonorae have potential for the development of anti-cancer products.

Structural Elucidation of Garcipaucinones A and B From Garcinia paucinervis Using Quantum Chemical Calculations

Two tocotrienol derivatives, garcipaucinones A (1) and B (2), and a biosynthetically related known analogue (3) were isolated from the fruit of Garcinia paucinervis. Their structures including absolute configurations were unequivocally determined by spectroscopic methods complemented with electronic circular dichroism (ECD) calculations and gauge-independent atomic orbital (GIAO) NMR calculations. Compounds 1 and 2 are the first naturally occurring tocotrienol derivatives with a 3,10-dioxatricyclo-[7.3.1.0^2,7]tridecane skeleton incorporating an unusual γ-pyrone motif. A reasonable biosynthetic pathway for formation of the two compounds is proposed. The antiproliferative and anti-inflammatory activities of compounds 1 and 2 were also evaluated.

Kaempferol induces ROS-dependent apoptosis in pancreatic cancer cells via TGM2-mediated Akt/mTOR signaling

BACKGROUND

Kaempferol, a natural flavonoid, exhibits anticancer properties by scavenging reactive oxygen species (ROS). However, increasing evidence has demonstrated that, under certain conditions, kaempferol can inhibit tumor growth by upregulating ROS levels. In this study, we aimed to investigate whether kaempferol effectively suppresses pancreatic cancer through upregulation of ROS, and to explore the underlying molecular mechanism.

METHODS

PANC-1 and Mia PaCa-2 cells were exposed to different concentrations of kaempferol. Cell proliferation and colony formation were evaluated by CCK-8 and colony formation assays. Flow cytometry was performed to assess the ROS levels and cell apoptosis. The mRNA sequencing and KEGG enrichment analysis were performed to identify differentially expressed genes and to reveal significantly enriched signaling pathways in response to kaempferol treatment. Based on biological analysis, we hypothesized that tissue transglutaminase (TGM2) gene was an essential target for kaempferol to induce ROS-related apoptosis in pancreatic cancer. TGM2 was overexpressed by lentivirus vector to verify the effect of TGM2 on the ROS-associated apoptotic signaling pathway. Western blot and qRT-PCR were used to determine the protein and mRNA levels, respectively. The prognostic value of TGM2 was analyzed by Gene Expression Profiling Interactive Analysis (GEPIA) tools based on public data from the TCGA database.

RESULTS

Kaempferol effectively suppressed pancreatic cancer in vitro and in vivo. Kaempferol promoted apoptosis in vitro by increasing ROS generation, which was involved in Akt/mTOR signaling. TGM2 levels were significantly increased in PDAC tissues compared with normal tissues, and high TGM2 expression was positively correlated with poor prognosis in pancreatic cancer patients. Decreased TGM2 mRNA and protein levels were observed in the cells after treatment with kaempferol. Additionally, TGM2 overexpression downregulated ROS production and inhibited the abovementioned apoptotic signaling pathway.

CONCLUSIONS

Kaempferol induces ROS-dependent apoptosis in pancreatic cancer cells via TGM2-mediated Akt/mTOR signaling, and TGM2 may represent a promising prognostic biomarker for pancreatic cancer.

Eupholides A-H, abietane diterpenoids from the roots of Euphorbia fischeriana, and their bioactivities

The roots of Euphorbia fischeriana known as "Langdu" in traditional Chinese medicine have been used for the treatment of tuberculosis in China. Through a bioactive phytochemical investigation of the roots of E. fischeriana, 15 diterpenoids were obtained by various chromatographic techniques. On the basis of wide spectroscopic data, including NMR, UV, IR, HR-ESI-MS, ECD and X-ray crystallography, all of the isolated compounds were elucidated to be ent-abietane diterpenoid analogs, including undescribed eupholides A-H and seven known diterpenoids. In the bioassay for anti-tuberculosis, eupholides F-H moderately inhibited the proliferation of Mycobacterium tuberculosis H37Ra, with the MIC determined to be 50 μM. Furthermore, eupholides G, ent-11α-hydroxyabieta-8(14), 13(15)-dien-16,12α-olide, and jolkinolide F significantly inhibited the lyase activity of human carboxylesterase 2 (HCE 2), with IC₅₀ values of 7.3, 150, and 34.5 nM, respectively.

Study on the Role of Paclitaxel Nano-Drug Delivery System in Inhibiting Intimal Hyperplasia and Improving Vascular Remodeling in Abdominal Aortic Injury Model

The surface-modified paclitaxel nanoparticles were prepared to observe its inhibitory effect on the intimal and mediator proliferation and the improvement of vascular remodeling after rabbit abdominal aortic injury. First, paclitaxel nanoparticles were prepared by ultrasonic emulsification solvent evaporation method. The surface of paclitaxel nanoparticles was modified by physical adsorption, the nanoparticles were characterized and the encapsulation efficiency was evaluated. Secondly, the endometrial thickness was measured by hematoxylin and eosin staining, and a spheroid with a smooth surface was observed under a scanning electron microscope. Finally, compared with the control group, local infusion of paclitaxel nanoparticles could effectively inhibit the proliferation of vascular endothelium in a dose-dependent manner. Local intravascular infusion of paclitaxel nanoparticle suspension can effectively inhibit the proliferation of vascular endothelial cells, and its inhibitory effect increases with the increase of the concentration of nanoparticle suspension. The paclitaxel nanoparticle suspension at a concentration of 30 mg/ml can play a good inhibitory role.

The synthesis and cytotoxic activity of derivatives of 4β-hydroxywithanolide E

4β-Hydroxywithanolide E, which can be obtained in large amounts from the Physalis genus, possessed anti-proliferative effects on a variety of human cancer cell lines. For discussing its anti-tumor structure-activity relationship, a series of 4β-hydroxywithanolide E derivatives (1-17) were synthesized and evaluated for their antitumor activity in vitro towards acute promyelocytic leukemia NB4 cell line by the Alarma blue assay. Cytotoxicity data revealed that the enone structure and C-4 hydroxyl substituents of ring A, together with the side chain (C-20-C-28) play an important effect on the cytotoxicity.

Tirucallane triterpenoids from the mastic (Pistacia lentiscus) and their anti-inflammatory and cytotoxic activities

Phytochemical investigation of mastic, a resin produced by Pistacia lentiscus, led to the isolation and identification of 16 tirucallane triterpenoids, 13 (1-13) of which are undescribed. Their structures and absolute configurations were elucidated based on the analysis of spectroscopic data and single-crystal X-ray diffraction. Compounds 12 and 13 are unusual 7(8 → 9)abeo-tirucallane triterpenoids. Anti-inflammatory assays indicated that compounds 7, 8, 14, and 16 exhibited stronger inhibitory NO production activities (IC50 = 7.7-13.4 μM) than that of the positive control dexamethasone (IC50 = 19.5 μM). In addition, compound 1 showed comparable cytotoxic activity against HepG2 cells to that of doxorubicin (IC50 = 4.92 VS 1.34 μM).

Biological Activity of High-Purity β-1,3-1,6-Glucan Derived from the Black Yeast Aureobasidium pullulans: A Literature Review

The black yeast Aureobasidium pullulans produces abundant soluble β-1,3-1,6-glucan-a functional food ingredient with known health benefits. For use as a food material, soluble β-1,3-1,6-glucan is produced via fermentation using sucrose as the carbon source. Various functionalities of β-1,3-1,6-glucan have been reported, including its immunomodulatory effect, particularly in the intestine. It also exhibits antitumor and antimetastatic effects, alleviates influenza and food allergies, and relieves stress. Moreover, it reduces the risk of lifestyle-related diseases by protecting the intestinal mucosa, reducing fat, lowering postprandial blood glucose, promoting bone health, and healing gastric ulcers. Furthermore, it induces heat shock protein 70. Clinical studies have reported the antiallergic and triglyceride-reducing effects of β-1,3-1,6-glucan, which are indicators of improvement in lifestyle-related diseases. The primary and higher-order structures of β-1,3-1,6-glucan have been elucidated. Specifically, it comprises a single highly-branched glucose residue with the β-1,6 bond (70% or more) on a backbone of glucose with 1,3-β bonds. β-Glucan shows a triple helical structure, and studies on its use as a drug delivery system have been actively conducted. β-Glucan in combination with anti-inflammatory substances or fullerenes can be used to target macrophages. Based on its health functionality, β-1,3-1,6-glucan is an interesting material as both food and medicine.

Ascorbate-induced oxidative stress mediates TRP channel activation and cytotoxicity in human etoposide-sensitive and -resistant retinoblastoma cells

There are indications that pharmacological doses of ascorbate (Asc) used as an adjuvant improve the chemotherapeutic management of cancer. This favorable outcome stems from its cytotoxic effects due to prooxidative mechanisms. Since regulation of intracellular Ca2+ levels contributes to the maintenance of cell viability, we hypothesized that one of the effects of Asc includes disrupting regulation of intracellular Ca2+ homeostasis. Accordingly, we determined if Asc induced intracellular Ca2+ influx through activation of pertussis sensitive Gi/o-coupled GPCR which in turn activated transient receptor potential (TRP) channels in both etoposide-resistant and -sensitive retinoblastoma (WERI-Rb1) tumor cells. Ca2+ imaging, whole-cell patch-clamping, and quantitative real-time PCR (qRT-PCR) were performed in parallel with measurements of RB cell survival using Trypan Blue cell dye exclusion. TRPM7 gene expression levels were similar in both cell lines whereas TRPV1, TRPM2, TRPA1, TRPC5, TRPV4, and TRPM8 gene expression levels were downregulated in the etoposide-resistant WERI-Rb1 cells. In the presence of extracellular Ca2+, 1 mM Asc induced larger intracellular Ca2+ transients in the etoposide-resistant WERI-Rb1 than in their etoposide-sensitive counterpart. With either 100 µM CPZ, 500 µM La3+, 10 mM NAC, or 100 µM 2-APB, these Ca2+ transients were markedly diminished. These inhibitors also had corresponding inhibitory effects on Asc-induced rises in whole-cell currents. Pertussis toxin (PTX) preincubation blocked rises in Ca2+ influx. Microscopic analyses showed that after 4 days of exposure to 1 mM Asc cell viability fell by nearly 100% in both RB cell lines. Taken together, one of the effects underlying oxidative mediated Asc-induced WERI-Rb1 cytotoxicity stems from its promotion of Gi/o coupled GPCR mediated increases in intracellular Ca2+ influx through TRP channels. Therefore, designing drugs targeting TRP channel modulation may be a viable approach to increase the efficacy of chemotherapeutic treatment of RB. Furthermore, Asc may be indicated as a possible supportive agent in anti-cancer therapies.

Anti-osteosarcoma Biological Activity Evaluation and Complete Chloroplast Genome Sequencing of Populus yunnanensis

Recently, the Populus yunnanensis extract has drawn the attention of most researchers, because of their anti-cancer activity. In this present research, the anti-cancer activity of the Populus yunnanensis extract was measured with Cell Counting Kit-8 (CCK-8) detection kit on the cancer cells. Then, the inhibitory activity of the Populus yunnanensis extract on the migration and invasion ability of the cancer cells was also determined in this present research with trans-well assay. Subsequently, to reveal the evolutionary genome evolution evaluation of the Populus yunnanensis and other Populus species, the high-throughput Illumina pair-end sequencing was performed and the chloroplast (cp) genome of Populus yunnanensis was determined, and the phylogenetic analysis was finished as wells. The results of the CCK-8 assay indicated that the Populus yunnanensis extract showed inhibitory effect on the cancer cell viability. Besides, the migration and invasion ability of the cancer cell was also reduced by the Populus yunnanensis extract. The complete chloroplast genome sequence results revealed that the Populus yunnanensis has a 156,505 bp circular cp genome. The phylogenetic analysis further revealed that the Populus yunnanensis has closely relationship with Populus simonii.

Chemoprotective Effect of Syringic Acid on Cyclophosphamide Induced Ovarian Damage via Inflammatory Pathway

Cyclophosphamide (CP) is very well-known anticancer drug and commonly used against various cancers. CP therapy is related to female ovarian cancer and causes female infertility. The ovarian cancer associated with the increase oxidative stress and inflammatory reaction. Syringic acid (SA) is very well phyto-constituent and already proof antioxidant and anti-inflammatory effects on various diseases. We investigated the chemoprotective impact of SA on CP mediated ovarian damage, and the underlying mechanism. CP (75 mg/kg) was used to cause ovarian damage and rats were randomly divided into separate groups and received a different dose of SA for 14-day. Body weight, food and water intake were determined. Ovarian weight and tumor index was measured. Antioxidant parameters were determined in the serum and ovarian tissue. Pro-inflammatory cytokines, apoptosis parameters and inflammatory mediators were estimated in the serum. Hormonal parameters and Histomorphometry were estimated. Dose dependently treatment of SA significantly (p < 0.001) decreased the levels of biochemical parameter such as nitric oxide (NO), myeloperoxidase (MPO) and augmented the antioxidant parameters include catalase (CAT), glutathione (GSH), glutathione peroxidase (GPx), superoxide dismutase (SOD) and reduced malondialdehyde (MDA) level in serum and ovarian tissue. SA treatment significantly (p < 0.001) suppressed the level of luteinizing hormones (LH), anti-mullerian hormone (AMH), estradiol (E2) and folliclestimulating hormone (FSH) as well as ovarian follicles. SA significantly (p < 0.001) down-regulated cytokines, inflammatory mediator and caspase-3 parameters. Taken altogether, we conclude that SA considerably reduced ovarian damage via reduced oxidative stress and inflammatory reaction.

Anticancer and Anti-inflammatory Effect of Diosmin against Dalton Ascitic Lymphoma Induced Leukemia

Cancer is the world's biggest health problem and cancer-induced mortality happened all over the planet after the heart disease. The present study was to scrutinize the anti-leukemia effect of diosmin against Dalton Ascitic Lymphoma (DAL) induced leukemia in mice. DAL cell was used for induction the solid tumor. Body weight, life spans, tumor volume and mean survival time was estimated. Antioxidant, biochemical and pro-inflammatory cytokines were estimated. Diosmin showed the cell viability effect at dose dependent manner against the both cell lines. DAL induced solid tumor mice showed the decreased body weight, mean survival days, non viable cell count and increased the tumor volume, viable cell count and diosmin significantly (p < 0.001) reverse the effect of DAL. Diosmin significantly (p < 0.001) altered the hematological, differential leukocytes, antioxidant, biochemical, pro-inflammatory cytokines at dose dependently. Collectively, we can say that diosmin might alter the DAL induced abnormality via antioxidant and anti-inflammatory effects.

Gossypol Reduces Metastasis and Epithelial-Mesenchymal Transition by Targeting Protease in Human Cervical Cancer

Metastasis is the most prevalent cause of cancer-associated deaths amongst patients with cervical cancer. Epithelial-mesenchymal transition (EMT) is essential for carcinogenesis, and it confers metastatic properties to cancer cells. Gossypol is a natural polyphenolic compound with anti-inflammation, anti-oxidant, and anticancer activities. In this study, we investigated the antimetastatic and antitumour effects of gossypol on human cervical cancer cells (HeLa and SiHa cells). Gossypol exerted a strong inhibition effect on the migration and invasion of human cervical cancer cells. It reduced the focal adhesion kinase (FAK) pathway-mediated expression of matrix metalloproteinase-2 and urokinase-type plasminogen activator, subsequently inhibiting the invasion of SiHa cells. In addition, gossypol reversed EMT induced by transforming growth factor beta 1 (TGF-[Formula: see text]1) and up-regulated epithelial markers, such as E-cadherin but significantly suppressed Ras homolog family member (Rho)A, RhoB, and p-Samd3. The tail vein injection model showed that gossypol treatment via oral gavage reduced lung metastasis. Gossypol also decreased tumour growth in vivo in the nude mouse xenograft model. All these findings suggest that gossypol suppressed the invasion and migration of human cervical cancer cells by targeting the FAK signaling pathway and reversing TGF-[Formula: see text]1-induced EMT. Hence, gossypol warrants further attention for basic mechanistic studies and drug development.

Enhancing Oral Bioavailability by Paclitaxel Polymeric Micelles: Role of Transmembrane Pathways in the Oral Absorption

The oral administration of paclitaxel suffering obstacles like poorly solubility and low permeability, causing extremely low oral bioavailability. In this study, we aim to study the role of transmembrane pathway on the absorption mechanisms of PTX-Micelles. In addition, we will further study the permeability of PTX-Micelles by employing in situ perfusion model. The results showed the PTX-Micelles could be up taken by caco-2 intact. In addition, we found that the endocytosis pathway and M cells pathway attended, while paracellular pathway absented in the transport process of PTX-Micelles. The study on in situ perfusion showed the absorption rate constant (Ka) of PTX was enhanced from 6.3, 6.1, 10.6 and 13.6 × 10^-2/min to 15.1, 18.4, 45.6 and 42.9 × 10^-2/min by micelles in duodenum, jejunum, ileum and colon, respectively, indicating the PTX-Micelles could enhance the permeability of PTX in intestinal membrane. This study indicating that transmembrane pathway-mediated transport is an important part in the transport process of polymeric micelles, and designing formulation based on transmembrane pathways may be a promising route for oral bioavailability enhancement of poor-soluble drugs.

St. John's Wort Suppresses Growth in Triple-Negative Breast Cancer Cell Line MDA-MB-231 by Inducing Prodeath Autophagy and Apoptosis

The rational regulation of programmed cell death by means of autophagy and apoptosis has been considered a potential treatment strategy for cancer. We demonstrated the inhibitory effect of St. John’s Wort (SJW) on growth in the triple-negative breast cancer (TNBC) cell line and xenografted mice and its target mechanism concerning autophagic and apoptotic cell death. SJW ethanol extract (SJWE) inhibited proliferation in a dose-dependent manner. SJWE treatment dramatically increased autophagy flux and apoptosis compared with the control. The autophagy inhibitor, 3-methyladenine (3-MA), reversed the SJWE-induced inhibition of cell proliferation and regulation of autophagy and apoptosis, indicating that SJWE induced apoptosis through prodeath autophagy. Furthermore, SJWE inhibited tumor growth and induced autophagy and apoptosis in the tumor of MDA-MB-231 xenografted athymic nude mice. Our results indicate that SJWE might have great potential as a new anticancer therapy for triple-negative breast cancer by inducing prodeath autophagy and apoptosis.

Kava as a Clinical Nutrient: Promises and Challenges

Kava beverages are typically prepared from the root of Piper methysticum. They have been consumed among Pacific Islanders for centuries. Kava extract preparations were once used as herbal drugs to treat anxiety in Europe. Kava is also marketed as a dietary supplement in the U.S. and is gaining popularity as a recreational drink in Western countries. Recent studies suggest that kava and its key phytochemicals have anti-inflammatory and anticancer effects, in addition to the well-documented neurological benefits. While its beneficial effects are widely recognized, rare hepatotoxicity had been associated with use of certain kava preparations, but there are no validations nor consistent mechanisms. Major challenges lie in the diversity of kava products and the lack of standardization, which has produced an unmet need for quality initiatives. This review aims to provide the scientific community and consumers, as well as regulatory agencies, with a broad overview on kava use and its related research. We first provide a historical background for its different uses and then discuss the current state of the research, including its chemical composition, possible mechanisms of action, and its therapeutic potential in treating inflammatory and neurological conditions, as well as cancer. We then discuss the challenges associated with kava use and research, focusing on the need for the detailed characterization of kava components and associated risks such as its reported hepatotoxicity. Lastly, given its growing popularity in clinical and recreational use, we emphasize the urgent need for quality control and quality assurance of kava products, pharmacokinetics, absorption, distribution, metabolism, excretion, and foundational pharmacology. These are essential in order to inform research into the molecular targets, cellular mechanisms, and creative use of early stage human clinical trials for designer kava modalities to inform and guide the design and execution of future randomized placebo controlled trials to maximize kava's clinical efficacy and to minimize its risks.

Clinical significance of Saussurea Costus in thyroid treatment

Saussurea costus (S. costus) belongs to family of Asteraceae and is one of the therapeutic plants extensively used as a traditional medicine in Saudi Arabia. Constituents of this plant have the potential to be developed as bioactive molecules. Among Arabs, the prevalence of thyroid disorders ranges from 6.18 % to 47.34% and hypothyroidism has been reported to be the most prevalent. Although there is no natural treatment that can directly replace thyroid hormones, their role as an alternate treatment or as an add-on to available thyroid treatment has been explored. Flavanoids and antioxidant properties of S. costus may be an important mechanism involved in supporting its medicinal use. Current data on the possible role of S. costus in thyroid disorders is lacking and the available evidence is inconclusive. This review deal with the current understanding of use and myth regarding the use of this medicinal plant in thyroid disease.

Germacranolides from Elephantopus scaber L. and their cytotoxic activities

Seven undescribed germacranolides, named as scabertopinolide A-G were obtained from whole herbs of Elephantopus scaber L. The determination of their structures was conducted via comprehensive spectroscopic analyses combined with experimental electronic circular dichroism (ECD) spectroscopic data and quantum mechanical ECD calculations. The absolute configuration of scabertopinolide A was determined by X-ray crystallography data analysis. The cytotoxicity of all compounds was evaluated against three human cancer cell lines HepG2, Hep3B (human hepatocellular carcinoma cell lines), and MCF-7 (human breast adenocarcinoma cell line). Scabertopinolide G exhibited the most significant cytotoxic activities against the three cancer cell lines with IC₅₀ values between 7.0 and 10.3 μM. Furthermore, flow cytometry analysis has suggested that scabertopinolide G may cause death of cancer cells through apoptosis induction.

Triterpene saponins from the seeds of Erythrophleum fordii and their cytotoxic activities

Erythrosides A-G, seven undescribed oleanane-type triterpenoid saponins, were isolated from the seeds of Erythrophleum fordii. Their structures with absolute configurations were determined by extensive spectroscopic analysis including one-dimensional [1D] and two-dimensional [2D] nuclear magnetic resonance [NMR], high-resolution electrospray ionization mass spectroscopy [HR-ESI-MS] analysis, and chemical methods. Erythrosides A-G featured a diverse oligosaccharide chain containing 4-6 pentoses or hexoses at C-3 and a monoterpenic acid or a (E)-cinnamic acid unit at the C-21 position. Of particular interest, erythrosides A-C, E and F contained a rare alpha xylose in their sugar chains. The bioassay results indicated that erythrosides A-C showed moderate cytotoxic activities against human lung cancer cell line PC9 with IC₅₀ values of 13.14, 16.67 and 17.59 μM, respectively (the positive control, Taxol, IC₅₀ = 0.60 nM).

Alkaloids isolated from Tropaeolum tuberosum with cytotoxic activity and apoptotic capacity in tumour cell lines

Two alkaloids were isolated and identified for the first time in the black tubers of Tropaeolum tuberosum, collected from the Titicani-Taca, Ingavi province in La Paz, Bolivia. Their structures were elucidated by extensive NMR and MS spectroscopic analyses. The isolated compounds were evaluated for their cytotoxicity and apoptotic capacity against four human cancer cell lines. 2-Benzyl-3-thioxohexahydropyrrolo[1,2-c]imidazole-1-one (1) showed slight cytotoxic activity against all the cancer cell lines which were tested, with IC₅₀ values ranging from 27.45 ± 0.80 to 31.07 ± 0.87 μM. Moreover, N-(4-acetyl-5-methyl-5-phenyl-4,5-dihydro-1,3,4-thiadiazol-2-yl) acetamide (2) showed significant anti-cancer potential, with IC₅₀ values between 1.26 ± 0.57 μM and 1.37 ± 0.09 μM against all human cancer cell lines which were tested. Treatment of tumour cell lines with the compounds caused an increase in the apoptotic rate of these cells, observing that compound 2 presented an apoptotic effect which was double with respect to the control (Dimethylenastron).

Antiproliferative diterpenoids and acetophenone glycoside from the roots of Euphorbia fischeriana

Three undescribed compounds and nine known compounds were isolated from the Euphorbia fischeriana Steud. Their structures were elucidated by extensive analysis of the 1D and 2D NMR spectra and HRESIMS data. The absolute configurations of two undescribed diterpenoids were determined by comparing their experimental and calculated ECD data. To further understand the antitumor effects of E. fischeriana, we tested the antiproliferative activities of these compounds against AGS, Hep-G2 cell lines in vitro using CCK-8 assays. The results showed that both types of compounds had significant antiproliferative effects, among which a diterpenoid with a galloyl moiety (IC₅₀ = 7.03 μM) was the most significant one that could be regarded as a potential leading compound against liver cancer for further comprehensive study.

Cytotoxic monoterpenoid indole alkaloids from the aerial parts of Kopsia officinalis

Three new monoterpenoid indole alkaloids, kopsiaofficines A-D (1-3), were isolated from the 95% EtOH extract of the aerial parts of Kopsia officinalis. Their structures were established on the basis of spectroscopic data. The isolated alkaloids were tested in vitro for cytotoxic activity against seven lung cancer cell lines. Consequently, alkaloids 1 and 3 exhibited some cytotoxic activities against all the tested tumor cell lines with IC₅₀ values less than 20 µM.[Formula: see text].

Triterpene glycosides from Silene odontopetala

Silene species are known for their use in traditional medicine in treating several diseases. To the authors' knowledge there is no report on the chemical composition of S. odontopetala. Therefore, the phytochemical investigation of the methanol extract of S. odontopetala was carried out, leading to the isolation of six undescribed oleanane-type glycosides along with the known saponin azukisaponin IV. Their structures were elucidated by the analysis of 1D and 2D-NMR experiments, along with mass spectrometry analysis. The cytotoxic activity of oleanane-type saponins was evaluated against a small panel of cancer cell lines, including PC-3 (prostate carcinoma cells), MCF-7 (breast cancer cells), A549 (alveolar basal carcinoma cells), and HeLa (cervical carcinoma cells). Furthermore, the activity of isolated compounds against a normal cell line HEK-293, used for assessing their cytotoxicity, was evaluated.

Three new isoquinoline alkaloids from the whole plants of Thalictrum tenue with cytotoxic activities

Three new isoquinoline alkaloids, including two aporphines (1 and 2) and one oxoaporphine (3), were isolated from the 90% EtOH extract of the whole plants of Thalictrum tenue Franch. The structures of the isolated compounds were established based on 1D and 2D (¹H-¹H COSY, HMQC, and HMBC) NMR spectroscopy, in addition to high resolution mass spectrometry, respectively. The isolated alkaloids were tested in vitro for cytotoxic activity against six esophageal carcinoma cell lines. Consequently, alkaloids 1-3 exhibited some cytotoxic activities against all the tested tumor cell lines with IC₅₀ values less than 20 μM. [Formula: see text].

Dietary Crocin is Protective in Pancreatic Cancer while Reducing Radiation-Induced Hepatic Oxidative Damage

Pancreatic cancer is one of the fatal causes of global cancer-related deaths. Although surgery and chemotherapy are standard treatment options, post-treatment outcomes often end in a poor prognosis. In the present study, we investigated anti-pancreatic cancer and amelioration of radiation-induced oxidative damage by crocin. Crocin is a carotenoid isolated from the dietary herb saffron, a prospect for novel leads as an anti-cancer agent. Crocin significantly reduced cell viability of BXPC3 and Capan-2 by triggering caspase signaling via the downregulation of Bcl-2. It modulated the expression of cell cycle signaling proteins P53, P21, P27, CDK2, c-MYC, Cyt-c and P38. Concomitantly, crocin treatment-induced apoptosis by inducing the release of cytochrome c from mitochondria to cytosol. Microarray analysis of the expression signature of genes induced by crocin showed a substantial number of genes involved in cell signaling pathways and checkpoints (723) are significantly affected by crocin. In mice bearing pancreatic tumors, crocin significantly reduced tumor burden without a change in body weight. Additionally, it showed significant protection against radiation-induced hepatic oxidative damage, reduced the levels of hepatic toxicity and preserved liver morphology. These findings indicate that crocin has a potential role in the treatment, prevention and management of pancreatic cancer.

Anticancer Activity of Rosmarinus officinalis L.: Mechanisms of Action and Therapeutic Potentials

Alternative treatments for neoplastic diseases with new drugs are necessary because the clinical effectiveness of chemotherapy is often reduced by collateral effects. Several natural substances of plant origin have been demonstrated to be successful in the prevention and treatment of numerous tumors. Rosmarinus officinalis L. is a herb that is cultivated in diverse areas of the world. There is increasing attention being directed towards the pharmaceutical capacities of rosemary, utilized for its anti-inflammatory, anti-infective or anticancer action. The antitumor effect of rosemary has been related to diverse mechanisms, such as the antioxidant effect, antiangiogenic properties, epigenetic actions, regulation of the immune response and anti-inflammatory response, modification of specific metabolic pathways, and increased expression of onco-suppressor genes. In this review, we aim to report the results of preclinical studies dealing with the anticancer effects of rosemary, the molecular mechanisms related to these actions, and the interactions between rosemary and anticancer drugs. The prospect of utilizing rosemary as an agent in the treatment of different neoplastic diseases is discussed. However, although the use of rosemary in the therapy of neoplasms constitutes a fascinating field of study, large and controlled studies must be conducted to definitively clarify the real impact of this substance in clinical practice.

Cytotoxic xanthone derivatives from the twigs of Garcinia oligantha

Ten undescribed xanthone derivatives, garoliganthins A-I and oliganthaxanthone C, along with eight known compounds, were isolated from the twigs of Garcinia oligantha Merr. Their structures and absolute configurations were determined by extensive spectroscopic methods, single-crystal X-ray diffraction analysis, electronic circular dichroism analysis, and chiral HPLC/HPLC-CD analysis combined with density functional theory calculations. Garoliganthin A is an unprecedented tetrahydro-xanthone derivative possessing a bicycle [3.2.2] nonane skeleton, and garoliganthins B-E are the first examples of a new class of rearranged xanthone derivatives with six-membered lactone core scaffold. The cytotoxic effects of the isolates on four human cancer cell lines (HeLa, PC-3, A549, and K562) were measured using an MTT assay. Seven compounds showed good inhibitory activities against four cancer cell lines with IC₅₀ values ranging from 2.1 to 16.8 μM.

The Effect of 4'-hydroxy-3,4,5-trimetoxystilbene, the Metabolite of Resveratrol Analogue DMU-212, on Growth, Cell Cycle and Apoptosis in DLD-1 and LOVO Colon Cancer Cell Lines

Resveratrol is a phytoalexin that naturally occurs in grapes, blueberries, cranberries, peanuts and many other plants. Although resveratrol inhibits carcinogenesis in all three stages, its clinical application is restricted due to poor pharmacokinetics. The methylated analogues of resveratrol have been found to have higher bioavailability and cytotoxic activity than that of the prototupe compound. Among the various methoxy derivatives of resveratrol, 3,4,5,4′-tetrametoxystilbene (DMU-212) is suggested to be one of the strongest activators of cytotoxicity and apoptosis. DMU-212 has been shown to exert anti-tumor activity in DLD-1 and LOVO colon cancer cells. Since colorectal cancer is the third most common cause of cancer-related deaths worldwide, the development of new anticancer agents is nowadays of high significance. The aim of the present study was to assess the anticancer activity of 4′-hydroxy-3,4,5-trimetoxystilbene (DMU-281), the metabolite of DMU-212, in DLD-1 and LOVO cell lines. We showed for the first time the cytotoxic activity of DMU-281 triggered via cell cycle arrest at G2/M phase and apoptosis induction accompanied by the activation of caspases-9, -8, -3/7. Furthermore, DMU-281 has been found to change the expression pattern of genes and proteins related to intrinsic as well as extrinsic apoptosis. Since the activation of these pathways of apoptosis is still the most desired strategy in anticancer research, DMU-281 seems to provide a promising approach to the treatment of colon cancer.

Unusual glycosidic labdane diterpenoids with cytotoxicity from the root of Phlomoides betonicoides

Chemical investigation on the root of Phlomoides betonicoides led to the isolation of six undescribed diterpenoid glycosides, phlomoidesides A-F, along with two known ones using various chromatographic techniques. The structures of these compounds were determined by extensive spectroscopic analyses (including 1D, 2D-NMR and HRMS), single crystal X-ray diffraction, and calculated ¹³C NMR. The glycoside modifications of phlomoidesides A-F are rare in natural products, and a plausible biosynthetic pathway for these unusual glycosides was proposed. Phlomoidesides A, D, F, and phlomisosides V, Ш were cytotoxic against three human tumor cell lines, NCI-H1975, HepG2 and MCF-7, with IC₅₀ values ranging from 7.5 to 75.7 μM. Phlomoideside B only showed weak cytotoxicity against NCI-H1975, with IC₅₀ of 53.0- μM.

Kalshiolin A, new lignan from Kalimeris shimadai

The Asian plant Kalimeris shimadai has been used as food and ethnologic medicine for over a thousand years. In this study, we isolated and identified one new lignan, kalshiolin A (1), and 12 known lignans (2-13). The structures were characterized by the comprehensive analyses of spectroscopic data (HR-ESI-MS, IR, 1D, and 2D-NMR) and the absolute configuration of 1 was determined from ECD calculations. The new compound 1 was also screened for cytotoxic activity but did not show significant potency (IC50 35.9-43.3 μM) against A549, MDA-MB-231, MCF7, KB, and KB-VIN cell lines.

Gastric-cancer-derived mesenchymal stem cells: a promising target for resveratrol in the suppression of gastric cancer metastasis

The tumor microenvironment (TM) is an essential factor of tumor progression. Mesenchymal stem cells (MSCs) are important components of the TM and play critical roles in cancer metastasis. Resveratrol (RES) is a potential antitumor drug that has attracted extensive attention. However, it remains unclear whether RES can exert its antitumor activity by targeting MSCs located in the TM. In this study, we demonstrated that the conditioned medium of gastric-cancer-derived MSCs (GC-MSCs) promoted gastric cancer (GC) metastasis and facilitated the progression of epithelialmesenchymal transition (EMT) of GC cells. However, after pretreatment with RES, the prometastatic effect of GC-MSCs on GC cells was reversed. Furthermore, RES reduced GC-MSC (IL-6, IL-8, MCP-1, VEGF) gene expression and protein secretion, and counteracted the activation of the GC-MSC-induced Wnt/β-catenin signaling of GC cells, with less β-catenin nuclear transport and declined expression of β-catenin, CD44, and CyclinD3 in GC cells. Re-expression of β-catenin impaired the inhibitory effect of RES on GC cells. In conclusion, RES restricted the mobility increase of GC cells and reversed the progress of EMT induced by GC-MSCs by inactivating the Wnt/β-catenin signaling. GC-MSCs are promising target for RES in the inhibition of GC metastasis.

Seven new 1-oxygenated cholestane glycosides from Ornithogalum saundersiae

As the continuous scientific research, seven new 1-oxygenated cholestane glycosides named osaundersiosides 1 A - 1 G were isolated from an EtOH extract of the bulbs of Ornithogalum saundersiae. Their structures were deduced by means of spectroscopic data, chemical evidence and the results of hydrolytic cleavage. The cytotoxicity and anti-inflammatory effects of osaundersiosides 1 A - 1 G were evaluated, but none of them displayed significant activities. [Formula: see text].

New ingol-type diterpenes from the latex of Euphorbia resinifera

Two new ingol-type diterpenes, euphoresins A-B (1-2), have been isolated from the methanol extract of Euphorbium, the latex of Euphorbia resinifera Berg. Their structures were established on the basis of extensive analyses of their HR-ESI-MS, IR, UV, 1D, and 2D NMR spectra. The absolute configurations were confirmed by Mosher's method and circular dichroism (CD) analyses. The two compounds were tested for their cytotoxic activities against MCF-7, U937, and C6 cancer cell lines, but they both exhibited little cytotoxic effect.