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1.
J Agric Food Chem ; 72(14): 8225-8236, 2024 Apr 10.
Artigo em Inglês | MEDLINE | ID: mdl-38557068

RESUMO

As a continuous flow investigation of novel pesticides from natural quinolizidine alkaloids, the chemical compositions of the seeds of Sophora alopecuroides were thoroughly researched. Fifteen new aloperine-type alkaloids (1-15) as well as six known aloperine-type alkaloids (16-21) were obtained from the extract of S. alopecuroides. The structures of 1-21 were confirmed via HRESIMS, NMR, UV, IR, ECD calculations, and X-ray diffraction. The antiviral activities of 1-21 against tobacco mosaic virus (TMV) were detected following the improved method of half-leaf. Compared with ningnanmycin (protective: 69.7% and curative: 64.3%), 15 exhibited excellent protective (71.7%) and curative (64.6%) activities against TMV. Further biological studies illustrated that 15 significantly inhibited the transcription of the TMV-CP gene and increased the activities of polyphenol oxidase (PPO), peroxidase (POD), superoxide dismutase (SOD), and phenylalanine ammonia-lyase (PAL). The antifungal activities of 1-21 against Phytophythora capsica, Botrytis cinerea, Alternaria alternata, and Gibberella zeae were screened according to a mycelial inhibition test. Compound 13 displayed excellent antifungal activity against B. cinerea (EC50: 7.38 µg/mL). Moreover, in vitro antifungal mechanism studies displayed that 13 causes accumulation of reactive oxygen species and finally leads to mycelia cell membrane damage and cell death in vitro.


Assuntos
Alcaloides , Quinolizidinas , Sophora , Vírus do Mosaico do Tabaco , Antifúngicos , Sophora/química , Alcaloides/química , Antivirais/farmacologia , Antivirais/química , Sementes/química
2.
J Agric Food Chem ; 72(12): 6711-6722, 2024 Mar 27.
Artigo em Inglês | MEDLINE | ID: mdl-38491973

RESUMO

Through bioassay-guided isolation, eight undescribed coumarins (1-8), along with six reported coumarins (9-14), were obtained from Coriaria nepalensis. The new structures were determined by using IR, UV, NMR, HRESIMS, and ECD calculations. The results of the biological activity assays showed that compound 9 exhibited broad spectrum antifungal activities against all tested fungi in vitro and a significant inhibitory effect on Phytophthora nicotianae with an EC50 value of 3.00 µg/mL. Notably, compound 9 demonstrated greater curative and protective effects against tobacco balack shank than those of osthol in vivo. Thus, 9 was structurally modified to obtain new promising antifungal agents, and the novel derivatives (17b, 17j, and 17k) exhibited better effects on Sclerotinia sclerotiorum than did lead compound 9. Preliminary mechanistic exploration illustrated that 9 could enhance cell membrane permeability, destroy the morphology and ultrastructure of cells, and reduce the exopolysaccharide content of P. nicotianae mycelia. Furthermore, the cytotoxicity results revealed that compound 9 exhibited relatively low cytotoxicity against HEK293 cell lines with an inhibition rate of 33.54% at 30 µg/mL. This research is promising for the discovery of new fungicides from natural coumarins with satisfactory ecological compatibility.


Assuntos
Fungicidas Industriais , Magnoliopsida , Humanos , Células HEK293 , Fungicidas Industriais/química , Antifúngicos/farmacologia , Nicotiana , Cumarínicos/química , Relação Estrutura-Atividade
3.
J Agric Food Chem ; 72(9): 5047-5061, 2024 Mar 06.
Artigo em Inglês | MEDLINE | ID: mdl-38394631

RESUMO

As part of our ongoing investigation of natural bioactive substances from the genus Thermopsis of the tribe Fabaceae for agricultural protection, the chemical constituents of the herb Thermopsis lupinoides were systematically investigated, which led to the isolation of 39 quinolizidine alkaloids (QAs) (1-39), including 14 new QAs (1-14) and 14 isoflavones (40-53). Their structures were elucidated through comprehensive spectroscopic data analysis (IR, UV, NMR, HRESIMS), ECD calculations, and X-ray crystallography. The antitomato spotted wilt virus (TSWV) and antifungal (against Botrytis cinerea, Gibberella zeae, Phytophythora capsica, and Alternaria alternata) and insecticidal (against Aphis fabae and Tetranychus urticae) activities of the isolated compounds were screened using the lesion counting method, mycelial inhibition assay, and spray method, respectively. The bioassay results showed that 34 exhibited excellent protective activity against TSWV, with an EC50 value of 36.04 µg/mL, which was better than that of the positive control, ningnanmycin (86.03 µg/mL). The preliminary mechanistic exploration illustrated that 34 induced systemic acquired resistance in the host plant by acting on the salicylic acid signaling pathway. Moreover, 1 showed significant antifungal activity against B. cinerea (EC50 value of 20.83 µg/mL), while 2 exhibited good insecticidal activity against A. fabae (LC50 value of 24.97 µg/mL). This research is promising for the invention of novel pesticides from QAs with high efficiency and satisfactory ecological compatibility.


Assuntos
Fabaceae , Fungicidas Industriais , Inseticidas , Antifúngicos/farmacologia , Antifúngicos/química , Fungicidas Industriais/farmacologia , Fungicidas Industriais/química , Alcaloides Quinolizidínicos , Inseticidas/farmacologia , Inseticidas/química , Antivirais/farmacologia , Relação Estrutura-Atividade
4.
J Asian Nat Prod Res ; 26(3): 302-312, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-37312516

RESUMO

Three new quinolizidine alkaloids (1 - 3), including one new naturally isoflavone and cytisine polymer (3), along with 6 known ones were isolated from the ethanol extract of Sophora tonkinensis Gagnep. Their structures were elucidated by comprehensive spectroscopic data analysis (IR, UV, HRESIMS, 1D and 2D NMR), combined with ECD calculations. The antifungal activity against Phytophythora capsica, Botrytis cinerea, Gibberella zeae, and Alternaria alternata of the compounds was evaluated in a mycelial inhibition assay. Biological tests indicated that compound 3 exhibited strong antifungal activity against P. capsica with EC50 values of 17.7 µg/ml.


Assuntos
Alcaloides , Sophora , Alcaloides Quinolizidínicos , Sophora/química , Antifúngicos/farmacologia , Raízes de Plantas/química , Alcaloides/química , Estrutura Molecular
5.
Nat Prod Res ; : 1-6, 2023 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-38099336

RESUMO

Four new steroids cynansteroid G-I (1-3) and cynansteroid K (4), a new natural product 5,6-deacidizingcaudatin (5), and a known compound glycocaudatin (6), were isolated from the roots of Cynanchum auriculatum. The structures of new compounds were identified by comprehensive spectroscopic analyses, including NMR, HRESI-MS, ECD, UV, and IR spectral data. The cytotoxic activities of all the isolates against two human tumour cell lines (COLO-205 and BGC-823) were screened, unfortunately, which were weaker than positive control.

6.
J Agric Food Chem ; 71(44): 16581-16592, 2023 Nov 08.
Artigo em Inglês | MEDLINE | ID: mdl-37897427

RESUMO

Physalis angulata Linn. is an exotic Amazonian fruit that is commonly recognized as wild tomato, winter cherry, and gooseberry. While its fruit is known to contain many nutrients, such as minerals, fibers, and vitamins, few papers have investigated withanolide derivatives from its fruits. UPLC-Q-Orbitrap-MS/MS, which produces fragmentation spectra, was applied for the first time to guide the isolation of bioactive withanolide derivatives from P. angulata fruits. As a result, twenty-six withanolide derivatives, including two novel 1,10-secowithanolides (1 and 2) and a new derivative (3), were obtained. Compounds 1 and 2 are rare rearranged 1,10-secowithanolides with a tetracyclic 7/6/6/5 ring system. All structures were assigned through various spectroscopic data and quantum chemical calculations. Nine withanolide derivatives exhibited significant inhibitory effects on three tumor cell lines with IC50 values of 0.51-13.79 µM. Moreover, three new compounds (1-3) exhibited potential nitric oxide inhibitory effects in lipopolysaccharide-stimulated RAW264.7 cells (IC50: 7.51-61.8 µM). This investigation indicated that fruits of P. angulata could be applied to treat and prevent cancer and inflammatory-related diseases due to their potent active withanolide derivatives.


Assuntos
Physalis , Vitanolídeos , Physalis/química , Relação Estrutura-Atividade , Vitanolídeos/farmacologia , Vitanolídeos/química , Frutas , Espectrometria de Massas em Tandem , Extratos Vegetais/farmacologia , Extratos Vegetais/química
7.
BMC Cancer ; 23(1): 868, 2023 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-37715133

RESUMO

BACKGROUND: Novel and effective immunotherapies are required for refractory or recurrent sarcomas. Transforming growth factor-beta (TGF-ß) is a diverse regulatory and fibrogenic protein expressed in multiple sarcoma tumors that promotes epithelial-mesenchymal transition and excessive deposition of extracellular matrix. This study evaluated the efficacy and safety of the anti-PD-L1/TGF-ß antibody TQB2858 in patients with refractory osteosarcoma and alveolar soft part sarcoma (ASPS). METHODS: This single-arm phase 1b exploratory study included patients with refractory osteosarcoma or ASPS who had previously undergone at least two lines of systemic therapy. Patients were administered 1200 mg of TQB2858 once every 3 weeks. The primary endpoint was objective response rate (ORR), with null and alternative hypotheses of ORR ≤5% and ≥20%, respectively. Exploratory biomarker analyses using immunohistochemistry (IHC) staining (for PD-L1 and TGF-ß) were performed on pre-treatment tumor samples. RESULTS: Eleven eligible patients were included in this study. TQB2858 did not demonstrate evidence of efficacy as 0/5 osteosarcomas had any objective response, while 2/6 ASPS showed a partial response. The median progression-free survivals were 1.51 (1.38, Not Evaluable) and 2.86 (1.38, Not Evaluable) months for the osteosarcoma and ASPS groups, respectively. None of the administered cycles met the criteria for unacceptable toxicity. Other Grade 3 toxicities included abnormal liver function and elevation of γ-glutamyl transferase. IHC analysis revealed that functional enrichment in the TGF-ß pathway or PD-L1 was not associated with treatment outcomes. CONCLUSIONS: The combination of PD-L1 and TQB2858 did not significantly improve the ORR in patients with recurrent osteosarcoma. However, it improved immunogenic responses in ASPS, even after progression upon anti-PD-1/PD-L1 therapy, with an acceptable safety profile. IHC profiling with pathway enrichment analysis may not have any predictive value for survival outcomes. TRIAL REGISTRATION: Prospectively registered in the Ethical Review Committee of Peking University People's Hospital. The trial registration number is 2021PHA105-001 and 2021PHA140-001 and the registration date was March 2, 2022. CLINICALTRIALS: gov Identifier CTR20213001 and CTR20220390.


Assuntos
Antineoplásicos Imunológicos , Neoplasias Ósseas , Osteossarcoma , Sarcoma Alveolar de Partes Moles , Neoplasias de Tecidos Moles , Humanos , Povo Asiático , Neoplasias Ósseas/tratamento farmacológico , População do Leste Asiático , Osteossarcoma/tratamento farmacológico , Sarcoma Alveolar de Partes Moles/tratamento farmacológico , Neoplasias de Tecidos Moles/tratamento farmacológico , Fator de Crescimento Transformador beta/antagonistas & inibidores , Antígeno B7-H1/antagonistas & inibidores , Antineoplásicos Imunológicos/uso terapêutico , Anticorpos/uso terapêutico
8.
Am J Cancer Res ; 13(4): 1509-1521, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37168346

RESUMO

In the era of molecular targeted drugs, elderly patients with acute myeloid leukemia (AML) are still very difficult to treat, especially those older than 70 years. The decline in immune function leads to serious infection and disease recurrence. The microtransplant treatment regimen (MST) chemotherapy combined with allogeneic hematopoietic stem cell infusion is a new cell therapy regimen. The aim of this MST study was to improve the survival of elderly patients by graft versus leukemia action and improving T-cell immune function. From May 2012 to July 2020, one hundred and eleven patients aged 70 to 88 years with de novo AML were analyzed retrospectively. After induction chemotherapy, patients whom complete remission (CR) was achieved were given another 2 cycles of postremission therapy. The MST groups were given allogeneic stem cell infusion after each chemotherapy cycle. CR, leukemia-free survival, and overall survival (OS) were compared between groups. Additionally, the immune function and the T cell receptor (TCR) library of T cells were detected and analyzed. The MST group exhibited an encouragingly high CR rate (63.8%), even in high-risk patients (54%), and this rate was significantly higher than that in the chemotherapy alone group. The 1-year OS of MST patients was 57.7%, and it was 55.9% in the high-risk group. It was only 37.3% in the chemotherapy alone group. Higher numbers of naive T cells were found in the MST population than in the chemotherapy alone group. More updated T-cell clones were observed in MST patients by T-cell receptor repertoire analysis with a next-generation sequencing methodology. These results suggest that MST is a safe and practical regimen conducive to longer-term survival in patients of a highly advanced age with AML. Furthermore, it has broad clinical value in the recovery of immune function in elderly patients.

9.
J Agric Food Chem ; 71(10): 4394-4407, 2023 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-36854107

RESUMO

As a continuation of our research on the development of pesticide active quinolizidine alkaloids (QAs) from the family Fabaceae, the chemical constituents of the root of Sophora tonkinensis Gagnep. were systematically investigated. Seventeen new matrine-type alkaloids (1-17), including one new naturally occurring compound (17), along with 20 known ones were isolated from the EtOH extract of S. tonkinensis. Notably, compound 5 possessed an unprecedented 6/6/5/4/6/6 hexacyclic system. Their structures were confirmed via comprehensive spectroscopic data analysis (IR, UV, NMR, HRESIMS), ECD calculation, and X-ray crystallography. Biological tests indicated that compounds 1, 4, 10, 12, 13, and 30 displayed significant anti-tomato spotted wilt virus (TSWV) activities compared with the positive control ningnanmycin. Moreover, compound 12 strongly inhibited the expression of the TSWV N, NSs, and NSm genes and TSWV NSs protein in plant host. Furthermore, compounds 4, 10, 12, 20, and 22 exhibited moderate insecticidal activities against TSWV thrip vector (Frankliniella occidentalis).


Assuntos
Sophora , Tospovirus , Matrinas/química , Matrinas/farmacologia , Tospovirus/efeitos dos fármacos , Antivirais/química , Antivirais/farmacologia , Espectrofotometria , Cristalografia por Raios X , Ativação Viral/efeitos dos fármacos , Animais , Inseticidas/química , Inseticidas/farmacologia , Proteínas não Estruturais Virais/genética , Modelos Moleculares , Estrutura Molecular , Raízes de Plantas
10.
J Asian Nat Prod Res ; 25(2): 163-170, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-35675145

RESUMO

Two new isoflavones (1 and 2), as well as eight known ones were isolated from the roots of Sophora tonkinensis Gagnep. Compound 1 represents an unprecedented polymerization pattern constructed by isoflavone and cytisine. Their structures were elucidated by comprehensive spectroscopic data analysis, combined with ECD calculations. Compound 1 displayed significant anti-tobacco mosaic virus (TMV) activity compared with the positive control ningnanmycin. Moreover, compound 6 exhibited potent α-glucosidase inhibitory activity with IC50 value of 47.4 mg/L.


Assuntos
Alcaloides , Isoflavonas , Sophora , Isoflavonas/farmacologia , Sophora/química , Raízes de Plantas/química , Alcaloides/química , Quinolizinas/análise
11.
Chem Biodivers ; 20(2): e202201097, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-36583710

RESUMO

A new quinoline alkaloid, 5-hydroxy-6-methoxy-N-methyl-2-phenylquinoline-4-one (1), and seventeen known quinoline alkaloids (2-18) were isolated from the roots of Orixa japonica. The structure of 1 was determined by analysis of spectroscopic data. Among them, compounds 2, 3, and 13 were isolated from this plant for the first time. All isolates were screened for the anti-pathogenic fungi activities, including Rhizoctonia solani, Magnaporthe oryzae, and Phomopsis sp. The results showed that five compounds (4, 8, 10, 11, and 12) exhibited significant anti-pathogenic fungi effects at 50.0 µg/mL. In special, compound 10 exhibited the best antifungal activities toward R. solani and M. oryzae with the IC50 values of 37.86 and 44.72 µM, respectively, better than that of the positive control, hymexazol (IC50 121.21 and 1518.18 µM, respectively). Moreover, eleven new quinoline alkaloids derivatives (12a-12k) were designed and synthesized to investigate the structure-activity relationships (SARs). The SARs analysis indicated that the furo[2,3-b]quinoline skeleton and the methoxy at C-7 (compounds 8, 11, and 12) played a key role for improving the antifungal activities.


Assuntos
Alcaloides , Quinolinas , Antifúngicos/farmacologia , Estrutura Molecular , Relação Estrutura-Atividade , Quinolinas/química , Fungos
12.
J Org Chem ; 87(17): 11309-11318, 2022 09 02.
Artigo em Inglês | MEDLINE | ID: mdl-35981284

RESUMO

Six novel Maillard reaction products (MRPs) (1-6) were isolated from the processed Thermopsis lanceolata R. Br. seed extract, along with one biogenetically related intermediate (7). Compounds 1-4 possessed three rare dimerization patterns constructed by cytisine, whereas compounds 5 and 6 represented the first example of the addition products of cytisine and 5,6-dihydroxy-4-hexanolide. Their structures were elucidated by comprehensive spectroscopic data analysis and quantum chemistry calculations including GIAO 13C{1H} NMR and ECD calculation, combined with single-crystal X-ray diffraction analysis. Biologically, compound 3 displayed significant anti-tobacco mosaic virus activity compared with the positive control ningnanmycin.


Assuntos
Vírus do Mosaico do Tabaco , Antivirais/química , Produtos Finais de Glicação Avançada , Extratos Vegetais/química
13.
J Agric Food Chem ; 70(29): 9214-9226, 2022 Jul 27.
Artigo em Inglês | MEDLINE | ID: mdl-35849433

RESUMO

As part of our ongoing investigation of pesticide active quinolizidine alkaloids (QAs) from the family Fabaceae, the chemical constituents of the seeds of Thermopsis lanceolata R. Br. were systematically investigated. Bioassay-guided fractionation and purification of the crude extract led to the isolation of seventeen new QAs (1-17), including three new naturally occurring compounds (15-17), along with 15 known compounds (18-32). Their structures were elucidated by comprehensive spectroscopic data analysis (IR, UV, NMR, and HRESIMS) and quantum chemistry calculations (13C NMR and ECD). The antitomato spotted wilt virus activities and insecticidal activities against Aphis fabae, Nilaparvata lugens (Stal), and Tetranychus urticae of compounds 1-32 were screened using the lesion counting method, spray method, and rice-stem dipping method, respectively. Biological tests indicated that compounds 6, 9, 10, and 18 displayed significant anti-TSWV activities compared with the positive control ningnanmycin. Compounds 3, 4, and 5 showed better insecticidal activities against A. fabae with LC50 values of 10.07, 12.07, and 6.56 mg/L, respectively. Moreover, compounds 5, 18, and 24 exhibited moderate insecticidal activities against N. lugens (Stal) with LC50 values of 37.91, 53.44, and 31.21 mg/L, respectively. Furthermore, compounds 9 and 10 exhibited moderate insecticidal activities against T. urticae.


Assuntos
Alcaloides , Afídeos , Fabaceae , Inseticidas , Quinolizidinas , Alcaloides/análise , Alcaloides/farmacologia , Animais , Inseticidas/química , Quinolizidinas/farmacologia , Sementes/química
14.
Chem Biodivers ; 19(6): e202200243, 2022 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-35560497

RESUMO

Three new compounds named cynansteroid A (1), cynansteroid B (2) and cynansteroid C (3), together with nine known C21 -steroidal pregnane sapogenins (4-12) were isolated from the hydrolytic extract of the roots of Cynanchum auriculatum. The structures of cynansteroid A-C (1-3) were ascertained via the detailed analysis of the HR-ESI-MS, 1D and 2D NMR, and the calculated and experimental ECD data of cynansteroid B (2). Compound 11 displayed moderate inhibitory activity toward Verticillium dahliae Kleb (IC50 =37.15 µM), furthermore, compounds 11 and 12 showed significant inhibitory activity against Phomopsis sp. (IC50 =16.49 µM and 17.62 µM, respectively).


Assuntos
Cynanchum , Sapogeninas , Cynanchum/química , Glicosídeos/química , Raízes de Plantas/química , Pregnanos/química , Pregnanos/farmacologia
15.
Fitoterapia ; 158: 105140, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35122885

RESUMO

Seven undescribed thermopsine-based alkaloids (1-7), including one undescribed biogenetically related intermediate (7), were isolated from the seeds of Thermopsis lanceolata R. Br. Compound 1 possessed a 6/6-6 tricyclic skeleton, while compounds 2-6 represented three rare dimerization patterns constructed by quinolizidine alkaloids. Their structures were elucidated by comprehensive spectroscopic data analysis as well as ECD calculations. Biologically, compound 6 displayed significant anti-Tomato spotted wilt virus (TSWV) activity compared with the positive control ningnanmycin. Moreover, compound 1 exhibited good insecticidal activity against Aphis fabae with LC50 value of 25.2 mg/L.


Assuntos
Alcaloides , Inseticidas , Alcaloides/química , Antivirais/química , Antivirais/farmacologia , Inseticidas/química , Inseticidas/farmacologia , Estrutura Molecular , Sementes/química
16.
Fitoterapia ; 158: 105158, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-35176424

RESUMO

Seven new acylated C-glycosylflavones, oreocharioside A-G, together with two known compounds were isolated from the whole plant of Oreocharis auricula. Their structures were characterized by the comprehensive analysis of their NMR, IR, UV, CD spectra and HRESIMS data. All the new compounds were evaluated for the antioxidant and anti-inflammatory activities. The results showed that compounds 1 and 2 had significant DPPH and ABTS radical scavenging activities, with the IC50 values of 0.32-3.20 µg/mL. Compounds 2 and 3 exhibited the higher potency among all the new compounds in reducing TNF-α production.


Assuntos
Anti-Inflamatórios , Antioxidantes , Anti-Inflamatórios/farmacologia , Antioxidantes/química , Estrutura Molecular , Extratos Vegetais/química
17.
J Asian Nat Prod Res ; 24(12): 1141-1149, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34984943

RESUMO

Two new (1 and 2) cytisine-type alkaloids that were chemically inseparable isomers (present in a 1:1 ratio) were identified from the seeds of Thermopsis lanceolata R. Br. Their structures were elucidated by comprehensive spectroscopic data analysis (IR, UV, NMR, HRESIMS) and ECD calculation. Compound 1 displayed significant anti-tobacco mosaic virus (TMV) activity, while compounds 1 and 2 displayed moderate insecticidal activities against Aphis fabae with LC50 value of 43.15 and 46.47 mg/L, respectively.


Assuntos
Alcaloides , Fabaceae , Estrutura Molecular , Quinolizinas/farmacologia , Alcaloides/farmacologia , Alcaloides/química , Azocinas , Sementes , Antivirais/química
18.
Phytochemistry ; 193: 112970, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-34689099

RESUMO

Hypericum monogynum L. (Hypericaceae) has been used as a folk Chinese medicine for the treatment of inflammatory related diseases. Cyclooxygenase-2 (COX-2) is a crucial target for the development of agents to treat inflammation. To search for anti-inflammatory compounds from traditional Chinese medicines, a chemical constituent study along with COX-2 inhibitory activity analysis was performed for this plant. In this study, sixteen chemical monomers, including three undescribed oxidative degradation polycyclic polyprenylated acylphloroglucinols (PPAPs, hypemoins C-E), two undescribed PPAPs (hypemoins A and B), and 11 known compounds, were identified from the flowers of H. monogynum. Their structures were characterized by HRESIMS, NMR techniques, ECD, and single crystal X-ray diffraction. Four flavonoid derivatives showed remarkable COX-2 inhibitory activities, with IC50 values ranging from 0.220 ± 0.006 to 1.655 ± 0.098 µM. Among these compounds, the possible recognition mechanism between quercetin 3-(6″-O-caffeoyl)-ß-3-D-galactoside and COX-2 was predicted by molecular docking analysis. Moreover, the multidrug resistance reversal activities for the selected compounds were evaluated.


Assuntos
Hypericum , Ciclo-Oxigenase 2 , Flores , Simulação de Acoplamento Molecular , Estrutura Molecular , Floroglucinol/farmacologia
19.
Artigo em Chinês | WPRIM (Pacífico Ocidental) | ID: wpr-940301

RESUMO

ObjectiveTo study the chemical constituents of the seeds of Sophora tonkinensis. MethodThe chemical constituents were isolated and purified by chromatography with MCI resin, silica gel, Sephadex LH-20, and semi-preparative high performance liquid chromatography. Their structures were identified by physicochemical properties, spectral data as well as relevant references. Meanwhile, the antibacterial activities against Helicobacter pylori of these compounds were screened by agar dilution method. ResultA total of 22 compounds were isolated from the methanol extract of the seeds of S. tonkinensis, and characterized as 4′,7-dihydroxy-6-methoxy isoflavone (1), daidzein (2), wighteone (3), dalparvone (4), 5,7-dihydroxy-4′-methoxyisoflavone (5), prunetin (6), formononetin (7), genistein (8), 5-methoxydaidzein (9), ononin (10), 7,4′-dihydroxyflavone (11), liquiritigenin (12), bayin (13), 2,4-dihydroxybenzoate (14), methyparaben (15), 4-hydroxyacetophenone (16), p-anisaldehyde (17), methyl indole-3-carboxylate (18), 4-[β-D-apiofuranoyl-(1→6)-O-β-D-glucopyranosyloxy] phenylacetonitrile (19), (-)-methyl dihydrophaseate (20), methyl canavaliol ester (21), vomifoliol 3′-O-β-D-apiofuranosyl-(1→6)-β-D-glucopyranoside (22). ConclusionCompounds 1, 5, 6, 9 and 16 are isolated from S. tonkinensis for the first time, compounds 4, 14, 17-22 are isolated from the genus of Sophora for the first time. In addition, compounds 10 and 13 display moderate antibacterial activities against H. pylori.

20.
Org Lett ; 23(8): 3125-3129, 2021 04 16.
Artigo em Inglês | MEDLINE | ID: mdl-33818113

RESUMO

Hymoins A-D (1-4), two pairs of light-induced transformative polyprenylated acylphloroglucinols with an unprecedented pentacyclic skeleton, were isolated from the flowers of Hypericum monogynum. The first decarbonylative ring contraction of complex natural products was investigated by light irradiation. Their structures were elucidated by nuclear magnetic resonance analysis, X-ray crystallography, and electronic circular dichroism calculations. In addition, compound 3 showed moderate inhibition efficacy of the platelet-activating-factor-induced aggregation of rabbit platelets.


Assuntos
Hypericum/química , Floroglucinol/química , Animais , Dicroísmo Circular , Cristalografia por Raios X , Espectroscopia de Ressonância Magnética , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Floroglucinol/isolamento & purificação , Coelhos
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