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1.
J Asian Nat Prod Res ; : 1-18, 2024 Jul 27.
Artículo en Inglés | MEDLINE | ID: mdl-39067002

RESUMEN

A series of amino acid ester trifluoroacetate derivatives was synthesized from scaberol C. They were screened for their inhibitory activity against Non-Small Cell Lung Cancer (NSCLC) cells. Among them, compound 2 l showed significant cytotoxicity against A549 and H460 cells (IC50), and was more active than cisplatin (DDP). The epidermal growth factor receptor (EGFR) was overexpressed in NSCLC, which was the target of multiple cancer therapies and a strong prognostic indicator. Our previous studies reported that the target of scaberol C derivatives against NSCLC cells was EGFR. And then molecular docking analysis and molecular dynamics (MD) simulations indicated that 2 l can stably and covalently bind to the EGFR target protein.

2.
Fitoterapia ; 175: 105947, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38570097

RESUMEN

Employing an MS/MS-based molecular networking-guided strategy, three new eudesmane-type sesquiterpenes (1-3) and one undescribed pseudoguaianolide sesquiterpene (8), along with four known eudesmane-type sesquiterpene lactones (4-7) were extracted and purified from the herbs of Carpesium abrotanoides L. Structural elucidation encompassed comprehensive spectroscopic analysis, NMR calculations, DP4+ analysis, and ECD calculations. The cytotoxicity activity of all isolates was evaluated against two human hepatoma carcinoma cells (HepG2 and Hep3B) in vitro. It was demonstrated that compounds 2 and 4 showed moderate cytotoxic against HepG2 and Hep3B cells. Furthermore, all compounds were evaluated for their acetylcholinesterase (AChE) inhibitory activity. Particularly noteworthy is that, in comparison to the positive control, compound 1 demonstrated significant AChE inhibition with an inhibition rate of 77.86%. In addition, the inhibitory mechanism of compound 1 were investigated by in silico docking analyze and molecular dynamic simulation.


Asunto(s)
Antineoplásicos Fitogénicos , Asteraceae , Inhibidores de la Colinesterasa , Simulación del Acoplamiento Molecular , Sesquiterpenos , Humanos , Inhibidores de la Colinesterasa/farmacología , Inhibidores de la Colinesterasa/aislamiento & purificación , Inhibidores de la Colinesterasa/química , Sesquiterpenos/farmacología , Sesquiterpenos/aislamiento & purificación , Sesquiterpenos/química , Estructura Molecular , Asteraceae/química , Antineoplásicos Fitogénicos/farmacología , Antineoplásicos Fitogénicos/aislamiento & purificación , Fitoquímicos/farmacología , Fitoquímicos/aislamiento & purificación , Células Hep G2 , Espectrometría de Masas en Tándem , Línea Celular Tumoral , China , Acetilcolinesterasa/metabolismo
3.
Bioorg Chem ; 147: 107367, 2024 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-38626492

RESUMEN

Lung cancer is the leading cause of cancer deaths worldwide. Non-small cell lung cancer (NSCLC) accounts for 80-85% of all lung cancers. Euphorbia kansui yielded 13-oxyingenol-dodecanoate (13OD), an ingenane-type diterpenoid, which had a strong cytotoxic effect on NSCLC cells. The underlying mechanism and potential target, however, remained unknown. The study found that 13OD effectively inhibited the cell proliferation and colony formation of NSCLC cells (A549 and H460 cells), with less toxicity in normal human lung epithelial BEAS-2B cells. Moreover, 13OD can cause mitochondrial dysfunction, and apoptosis in NSCLC cells. Mechanistically, the transcriptomics results showed that differential genes were mainly enriched in the mTOR and AMPK signaling pathways, which are closely related to cellular autophagy, the related indicators were subsequently validated. Additionally, bafilomycin A1 (Baf A1), an autophagy inhibitor, reversed the mitochondrial damage caused by 13OD. Furthermore, the Omics and Text-based Target Enrichment and Ranking (OTTER) method predicted ULK1 as a potential target of 13OD against NSCLC cells. This hypothesis was further confirmed using molecular docking, the cellular thermal shift assay (CETSA), and Western blot analysis. Remarkably, ULK1 siRNA inhibited 13OD's toxic activity in NSCLC cells. In line with these findings, 13OD was potent and non-toxic in the tumor xenograft model. Our findings suggested a possible mechanism for 13OD's role as a tumor suppressor and laid the groundwork for identifying targets for ingenane-type diterpenoids.


Asunto(s)
Homólogo de la Proteína 1 Relacionada con la Autofagia , Carcinoma de Pulmón de Células no Pequeñas , Proliferación Celular , Relación Dosis-Respuesta a Droga , Ensayos de Selección de Medicamentos Antitumorales , Neoplasias Pulmonares , Humanos , Carcinoma de Pulmón de Células no Pequeñas/tratamiento farmacológico , Carcinoma de Pulmón de Células no Pequeñas/patología , Carcinoma de Pulmón de Células no Pequeñas/metabolismo , Proliferación Celular/efectos de los fármacos , Neoplasias Pulmonares/tratamiento farmacológico , Neoplasias Pulmonares/patología , Relación Estructura-Actividad , Homólogo de la Proteína 1 Relacionada con la Autofagia/metabolismo , Homólogo de la Proteína 1 Relacionada con la Autofagia/antagonistas & inhibidores , Estructura Molecular , Diterpenos/farmacología , Diterpenos/química , Apoptosis/efectos de los fármacos , Animales , Ratones , Antineoplásicos Fitogénicos/farmacología , Antineoplásicos Fitogénicos/química , Péptidos y Proteínas de Señalización Intracelular/metabolismo , Péptidos y Proteínas de Señalización Intracelular/antagonistas & inhibidores , Antineoplásicos/farmacología , Antineoplásicos/química , Antineoplásicos/síntesis química
4.
J Asian Nat Prod Res ; : 1-13, 2024 Feb 12.
Artículo en Inglés | MEDLINE | ID: mdl-38347741

RESUMEN

Gastric cancer is one of the common malignant tumors. It is reported that daphne-type diterpenes have inhibitory effects on gastric cancer cells, but the mechanism is still unknown. To explore the detailed mechanism of the anticancer effect of daphne-type diterpenes, we carried out an integrated network pharmacology prediction study and selected an effective component (yuanhuacine, YHC) for the following validation in silico and in vitro. The result showed that daphne-type diterpenes exerted an anti-tumor effect by targeting proto-oncogene tyrosine-protein kinase SRC as well as regulating the Ras/MAPK signaling pathway, which caused the apoptosis and mitochondrial damage in gastric cancer cells.

5.
Phytochemistry ; 220: 113992, 2024 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-38301947

RESUMEN

Seven undescribed neovibsane-type diterpenoids (1-7) were isolated from the leaves of Viburnum odoratissimum. Their planar structures and relative configurations were elucidated based on a combination of 1D and 2D NMR analysis. The absolute configurations were confirmed by Rh2(OCOCF3)4-induced ECD analysis and comparison of experimental and TDDFT-calculated ECD spectrum. Based on the empirical results of the ECD of in situ formed Rh-complexes, rapid determination of the absolute configuration of C-14 within vibsane-type diterpenoids was proposed. In addition, 3 exhibited a high neuroblastoma cell protective effect of 81.8 % at 50 µM (the control group showed a neuroblastoma cell protective effect of 56.2 % at 50 µM).


Asunto(s)
Diterpenos , Neuroblastoma , Viburnum , Viburnum/química , Estructura Molecular , Diterpenos/química , Hojas de la Planta/química
6.
Bioorg Chem ; 145: 107208, 2024 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-38354501

RESUMEN

Hepatocellular carcinoma (HCC) is a major challenge for human healthy. Daphnane-type diterpenes have attracted increasingly attention due to remarkable pharmaceutical potential including anti-HCC activity. To further develop this class of compounds as inhibitors of HCC, the daphnane diterpenoids 12-O-debenzoyl-Yuanhuacine (YHC) and 12-hydroxydaphnetoxin (YHE) were prepared by a standard chemical transformation from dried flower buds of the Daphne genkwa plant. Subsequently, 22 daphnane diterpenoidal 1,3,4-oxdiazole derivatives were rationally designed and synthesized based on YHC and YHE. The assessment of the target compound's anti-hepatocellular carcinoma activity revealed that YHC1 exhibited comparable activity to sorafenib in the Hep3B cell line, while demonstrating higher selectivity. The mechanistic investigation demonstrates that compound YHC1 induces cell cycle arrest at the G0/G1 phase, cellular senescence, apoptosis, and elevates cellular reactive oxygen species levels. Moreover, molecular docking and CETSA results confirm the interaction between YHC1 and YAP1 as well as TEAD1. Co-IP experiments further validated that YHC1 can effectively inhibit the binding of YAP1 and TEAD1. In conclusion, YHC1 selectively targets YAP1 and TEAD1, exhibiting its anti-hepatocellular carcinoma effects through the inhibition of their interaction.


Asunto(s)
Carcinoma Hepatocelular , Daphne , Diterpenos , Neoplasias Hepáticas , Humanos , Carcinoma Hepatocelular/tratamiento farmacológico , Línea Celular Tumoral , Proliferación Celular , Daphne/química , Diterpenos/farmacología , Diterpenos/química , Neoplasias Hepáticas/tratamiento farmacológico , Simulación del Acoplamiento Molecular , Oxadiazoles/química , Oxadiazoles/farmacología
7.
Bioorg Chem ; 143: 107007, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38039928

RESUMEN

Hepatocellular carcinoma (HCC) is one of the most common malignant tumors worldwide, with high mortality and poor prognosis. WBDC-1 is a novel highly oxidized germacranolide from the Elephantopus tomentosus in our previous work, which has excellent anti-HCC activity, but the detailed mechanism is still unclear. In this study, we found that WBDC-1 was able to inhibit the proliferation and colony formation of Hep3B and HepG2 cells, as well as the cell migration ability and EMT. In addition, WBDC-1 showed no obvious toxicity to normal liver epithelial cells L-02. The potential targets of WBDC-1 were predicted by network pharmacology, and the following verified experiments showed that WBDC-1 exerted anti-HCC effect by targeting EGFR. Mechanismly, subsequent biological analysis showed that WBDC-1 can inhibit EGFR and its downstream RAS/RAF/MEK/ERK and PI3K/AKT signaling pathways. Overexpression of EGFR reversed the anticancer properties of WBDC-1. Consistent with in vitro experiments, WBDC-1 was able to inhibit tumor growth and was non-toxic in xenograft tumor models. In summary, this study revealed a potential tumor suppressive mechanism of WBDC-1 and provided a novel strategy for HCC treatment. It also laid a foundation for further research on the anti-tumor effect of highly oxidized germacranolides.


Asunto(s)
Carcinoma Hepatocelular , Neoplasias Hepáticas , Sesquiterpenos de Germacrano , Humanos , Carcinoma Hepatocelular/patología , Neoplasias Hepáticas/patología , Proteínas Proto-Oncogénicas c-akt/metabolismo , Fosfatidilinositol 3-Quinasas/metabolismo , Línea Celular Tumoral , Proliferación Celular , Receptores ErbB
8.
Fitoterapia ; 172: 105762, 2024 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-38040095

RESUMEN

Six undescribed guaianolide sesquiterpenes (1-6) were obtained from the aerial parts of Daphne penicillata. Their structures and absolute configuration were elucidated by HRESIMS, NMR analyses, ECD calculations and single-crystal X-ray diffraction analysis. Structurally, all compounds possess the typical 5,7-fused system of 8,12-guaianolides and this guaianolide-type was first reported to be isolated from Daphne penicillata. All compounds (1-6) were evaluated for anti-inflammatory and cytotoxic activity. Among them, compounds 1 and 5 showed moderate inhibitory effects on LPS-induced NO production in BV2 cells and 4 displayed potential inhibition against Hep3B cells with an IC50 value of 7.33 µM.


Asunto(s)
Daphne , Sesquiterpenos , Estructura Molecular , Sesquiterpenos de Guayano/farmacología , Sesquiterpenos/química , Componentes Aéreos de las Plantas/química
9.
Phytochemistry ; 218: 113950, 2024 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-38101591

RESUMEN

Eight structurally diverse rearranged sesquiterpenoids, including seven undescribed sesquiterpenoids (1a/1b and 3-8) were obtained from the aerial parts of Daphne penicillata. 1a/1b, 3, 5 and 6 possess rare rearranged guaiane skeletons and 4 represents the first example of rearranged carotene sesquiterpenoids. Their structures and absolute configurations were determined by extensive spectroscopic analyses, NMR and ECD calculations. Interestingly, 1a and 1b were a pair of magical interconverting epimers that may interconvert by retro-aldol condensation. The mechanism of interconversion has been demonstrated indirectly by 9-OH derivatization of 1a/1b and a hypothetical biogenetic pathway was proposed. All compounds were evaluated for anti-inflammatory and cytotoxic activities. Among them, 1a/1b and 2 exhibited potential inhibitory activities on the production of NO against LPS-induced BV2 microglial cells.


Asunto(s)
Daphne , Sesquiterpenos , Daphne/química , Estructura Molecular , Isomerismo , Sesquiterpenos/farmacología , Sesquiterpenos/química , Componentes Aéreos de las Plantas
10.
Phytochemistry ; 215: 113858, 2023 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-37709157

RESUMEN

Structural characteristics-guided investigation of Ailanthus altissima (Mill.) Swingle resulted in the isolation and identification of seven undescribed potential Michael reaction acceptors (1-7). Ailanlactone A (1) possesses an unusual 1,7-epoxy-11,12-seco quassinoid core. Ailanterpene B (6) was a rare guaianolide-type sesquiterpene with a 5/6/6/6-fused skeleton. Their structures were determined through extensive analysis of physiochemical and spectroscopic data, quantum chemical calculations, and single crystal X-ray crystallographic technology using Cu Kα radiation. The cytotoxic activities of isolates on HepG2 and Hep3B cells were evaluated in vitro. Encouragingly, ailanaltiolide K (4) showed significant cytotoxicity against Hep3B cells with IC50 values of 1.41 ± 0.21 µM, whose covalent binding mode was uncovered in silico.


Asunto(s)
Ailanthus , Cuassinas , Ailanthus/química , Extractos Vegetales/química , Hojas de la Planta , Cuassinas/química
11.
Phytochemistry ; 215: 113857, 2023 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-37716545

RESUMEN

A chemical investigation of Solanum lyratum Thunb. (Solanaceae) afforded six pairs of enantiomeric lignanamides consisting of twelve undescribed compounds, along with two undescribed racemic mixtures, and the separations of the enantiomers were accomplished by chiral-phase HPLC. The structures of these undescribed compounds were elucidated by the analysis of spectroscopic data, NMR and electronic circular dichroism calculations. All isolated compounds were assessed for neuroprotective activities in H2O2-induced human neuroblastoma SH-SY5Y cells, and acetylcholinesterase (AChE) inhibitory activities. Among tested isolates, some enantiomeric lignanamides exhibited conspicuous neuroprotective effects and AChE inhibitory effect.


Asunto(s)
Neuroblastoma , Fármacos Neuroprotectores , Solanum , Humanos , Estructura Molecular , Peróxido de Hidrógeno , Acetilcolinesterasa , Fármacos Neuroprotectores/farmacología , Fármacos Neuroprotectores/química
12.
Chem Biodivers ; 20(9): e202300941, 2023 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-37548481

RESUMEN

Four pairs of aryldihydronaphthalene-type lignanamide enantiomers were isolated from Solanum lyratum (Solanaceae). The enantiomeric separation was accomplished by chiral-phase HPLC, and five undescribed compounds were elucidated. Analysis by various spectroscopy and ECD calculations, the structures of undescribed compounds were illuminated. The neuroprotective effects of all compounds were evaluated using H2 O2 -induced human neuroblastoma SH-SY5Y cells and AchE inhibition activity. Among them, compound 4 a exhibited remarkable neuroprotective effects at high concentrations of 25 and 50 µmol/L comparable to Trolox. Compound 1 a showed the highest AchE inhibition with the IC50 value of 3.06±2.40 µmol/L. Molecular docking of the three active compounds was performed and the linkage between the compounds and the active site of AchE was elucidated.


Asunto(s)
Neuroblastoma , Fármacos Neuroprotectores , Solanum , Humanos , Solanum/química , Fármacos Neuroprotectores/química , Simulación del Acoplamiento Molecular , Estereoisomerismo , Estructura Molecular
13.
J Org Chem ; 88(17): 12385-12393, 2023 09 01.
Artículo en Inglés | MEDLINE | ID: mdl-37585921

RESUMEN

Cyclovibsanones A-D (1-4, respectively), featuring unprecedented caged tricyclo[5.4.1.05,9]dodecane and bicyclo[4.2.1]hexane cores, were isolated from the leaves of Viburnum odoratissimum. Their structures as well as that of one chemical derivative (5), which was transformed from 2, were determined by spectroscopic data, theoretical calculations, and the ML-JDP4/MAEΔΔδ methods. In addition, compounds 1 and 2 were found to possess dissimilarities in acid tolerance during nuclear magnetic resonance (NMR) experiments. The potential mechanism was consequently postulated and further supported through NMR analysis and mechanistic calculations. Biologically, chemical derivative 5 exerted antiproliferative activity against HepG2 cells.


Asunto(s)
Diterpenos , Humanos , Estructura Molecular , Diterpenos/química , Hojas de la Planta/química , Espectroscopía de Resonancia Magnética , Células Hep G2
14.
Nat Prod Res ; : 1-6, 2023 Aug 24.
Artículo en Inglés | MEDLINE | ID: mdl-37615118

RESUMEN

Ingenane-type diterpenoids (ITDs) are distinct components of plants belonging to the genus Euphorbia. These compounds have significant cytotoxic effects on non-small cell lung cancer (NSCLC) cells. However, the underlying molecular mechanism has yet to be reported. To explore the mechanism of the anticancer effect of ITDs, we carried out a network pharmacology prediction study. PPI network suggested that SRC and PI3K had high levels of interaction. In addition, KEGG analysis revealed that these common targets were significantly enriched in the PI3K/Akt signalling pathway. 13-oxyingenol-dodecanoate (13OD) was used for validation after the biological evaluation of some ITDs against NSCLC cells. It demonstrated that 13OD could significantly inhibit the growth of NSCLC cells by inducing apoptosis. The results from molecular docking and Western blotting showed that 13OD interacted with SRC and PI3K and down-regulated the SRC/PI3K/Akt signalling pathway in NSCLC cells. This study provided the underlying mechanism of ITDs against NSCLC.

15.
Phytochemistry ; 212: 113725, 2023 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-37224912

RESUMEN

Daphnane-type diterpenoids, which are scarce in nature, exhibit potent growth-inhibitory activities against various cancer cells. To identify more daphnane-type diterpenoids, the phytochemical components in the root extracts of Stellera chamaejasme L. were analysed in this study using the Global Natural Products Social platform and the MolNetEnhancer tool. Three undescribed 1α-alkyldaphnane-type diterpenoids (1-3; named stelleradaphnanes A-C) and 15 known analogues were isolated and characterised. The structures of these compounds were determined using ultraviolet and nuclear magnetic resonance spectroscopy. The stereo configurations of the compounds were determined using electronic circular dichroism. Next, the growth-inhibitory activities of isolated compounds against HepG2 and Hep3B cells were examined. Compound 3 exhibited potent growth-inhibitory activities against HepG2 and Hep3B cells with half-maximal inhibitory concentration values of 9.73 and 15.97 µM, respectively. Morphological and staining analyses suggested that compound 3 induced apoptosis in HepG2 and Hep3B cells.


Asunto(s)
Carcinoma Hepatocelular , Diterpenos , Neoplasias Hepáticas , Thymelaeaceae , Carcinoma Hepatocelular/tratamiento farmacológico , Neoplasias Hepáticas/tratamiento farmacológico , Diterpenos/farmacología , Diterpenos/química , Línea Celular , Thymelaeaceae/química , Estructura Molecular
17.
Phytomedicine ; 114: 154744, 2023 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-36934667

RESUMEN

BACKGROUND: Acute lung injury (ALI) has the attribution of excessive inflammation of the lung. Jinzhen oral liquid (JO), a famous Chinese recipe used to treat ALI, has a favorable therapeutic effect on ALI. However, its anti-inflammatory mechanism has not been extensively studied. PURPOSE: This study was to elucidate the effects of JO on lipopolysaccharide (LPS)-induced ALI and its molecular mechanism. METHODS: An ALI model was established by intratracheal instillation of LPS (2 mg/50 µl). The open field experiment was carried out to explore the spontaneous movement and exploratory behavior of ALI mice. Cytokines levels concentrations (IL-6, IL-10 and TNF-α) were determined by enzyme-linked immunosorbent assay (ELISA). Network pharmacology was used to predict the mechanism of JO against ALI. Immunofluorescence, co-immunoprecipitation, fluorescence resonance energy transfer (FRET), Western blot and RT-PCR were used to verify the molecular mechanisms of JO. RESULTS: The in vivo results suggested that JO (1, 2, 4 g/kg) dose-dependently improved the exercise performance of mice and reduced the lung W/D weight ratio as well as the production of IL-6 and TNF-α, but increased the release of IL-10 in the ALI group. The network pharmacological analysis demonstrated that the Toll-like receptor (TLR) pathway might be the fundamental action mechanisms of JO against ALI. Immunofluorescence staining and co-immunoprecipitation analysis showed that JO decreased the expression levels of TLR4 and MyD88 and reduced their interaction in the lung tissue of ALI mice. Meanwhile, JO decreased nuclear translocation and phosphorylation of NF-κB P65. The results from cellular experiments were in line with those in vivo. The FRET experiment also confirmed that JO disturbed the interaction of TLR4 and MyD88. Subsequently, we also found that the six indicative components of JO have the similar therapeutic effect as JO. CONCLUSIONS: In summary, we suggested that JO suppressed the TLR4/MyD88/NF-κB signaling pathway, thus inhibiting LPS-induced ALI in vitro and in vivo. The clarified mechanism provided an important theoretical basis and a novel treatment strategy for the ALI treatment of JO.


Asunto(s)
Lesión Pulmonar Aguda , FN-kappa B , Humanos , FN-kappa B/metabolismo , Lipopolisacáridos/efectos adversos , Factor 88 de Diferenciación Mieloide/metabolismo , Interleucina-10/metabolismo , Receptor Toll-Like 4/metabolismo , Interleucina-6/metabolismo , Factor de Necrosis Tumoral alfa/metabolismo , Lesión Pulmonar Aguda/tratamiento farmacológico , Pulmón/metabolismo
18.
J Nat Prod ; 86(2): 290-306, 2023 02 24.
Artículo en Inglés | MEDLINE | ID: mdl-36745506

RESUMEN

The prenylated flavonoid icaritin (ICT, 1), a new drug for treating advanced hepatocellular carcinoma (HCC), was selected as a template to develop more potent inhibitors. An initial semisynthetic modification of ICT was performed to obtain a structure-activity relationship (SAR), which indicated that the cytotoxicity is enhanced by OH-3 rhamnosylation and that OH-7 is an important modification site. Based on the results of the SAR study, 46 N-containing ICT derivatives were synthesized and evaluated as the anti-HCC inhibitors. The results showed that most of the derivatives produced inhibited three HCC cell lines used (Hep3B, HepG2 and SMMC-7721). The modification strategy was validated by 3D-QSAR, which provided information for the further design and optimization of ICT. The most potent compound, 11c, exhibited IC50 values of 7.6 and 3.1 µM against HepG2 and SMMC-7721 cells, respectively, which were more potent than those of ICT and sorafenib, respectively. Further mechanistic studies indicated that 11c caused arrest at the G0/G1 phase in the cell cycle and induced cell apoptosis in HepG2 and SMMC-7721 cells.


Asunto(s)
Antineoplásicos , Carcinoma Hepatocelular , Neoplasias Hepáticas , Humanos , Carcinoma Hepatocelular/tratamiento farmacológico , Neoplasias Hepáticas/tratamiento farmacológico , Flavonoides/farmacología , Línea Celular Tumoral , Relación Estructura-Actividad , Relación Estructura-Actividad Cuantitativa , Antineoplásicos/farmacología , Proliferación Celular , Apoptosis , Ensayos de Selección de Medicamentos Antitumorales
19.
Chem Biodivers ; 20(4): e202300067, 2023 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-36810976

RESUMEN

In this phytochemical investigation, two pairs of new phenylethanoid derivative enantiomers (1a/1b and 2a/2b), a new phenylethanoid derivative 3b, and seven known compounds (3a, 4-9) were isolated from the leaves of Picrasma quassioides. Spectroscopic techniques were used for the elucidation of their chemical structures, and the absolute configurations were determined by a comparison between the experimental and calculated ECD data, as well as the application of Snatzke's method. Compounds (1a/1b-3a/3b) were measured for their production of NO levels in LPS-induced BV-2 microglial cells. The results showed that all compounds exhibited potential inhibitory effects, and compound 1a showed stronger activity than the positive control.


Asunto(s)
Antiinflamatorios , Microglía , Alcohol Feniletílico , Antiinflamatorios/química , Antiinflamatorios/farmacología , Estructura Molecular , Análisis Espectral , Estereoisomerismo , Alcohol Feniletílico/análogos & derivados
20.
J Agric Food Chem ; 2023 Feb 14.
Artículo en Inglés | MEDLINE | ID: mdl-36786443

RESUMEN

Stigma maydis (corn silk) (S. maydis) is a food-based by-product of maize and possesses great nutritional and pharmaceutical value. This study aimed to explore bioactive components from S. maydis. By the guidance of bioactivity-guided approach and Global Natural Products Social (GNPS) molecular networking, 12 terpenoids were discovered from S. maydis. The structures of 11 undescribed compounds (1-11) were determined by detailed spectroscopic analyses, single-crystal X-ray diffraction analysis, specific rotation calculations, electronic circular dichroism (ECD) calculations, and NMR calculations. The neuroprotective and acetylcholinesterase (AChE) inhibitory effects of 1-12 were examined, and most of them showed significant or moderate activities. The underlying neuroprotective mechanism of 4 and 5 was revealed by Hoechst 33258, AO-EB, and JC-1 staining assays. This work illustrated the potential of S. maydis as a prospective natural source of bioactive compounds in food and pharmaceutical industries.

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