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1.
Acta Pharmaceutica Sinica B ; (6): 895-902, 2020.
Article in English | WPRIM | ID: wpr-828836

ABSTRACT

Seven indole alkaloid glycosides containing a 1'-(4″-hydroxy-3″,5″-dimethoxyphenyl)ethyl unit (-) were isolated from an aqueous extract of leaves (da qing ye). Their structures were determined by spectroscopic data analysis combined with enzymatic hydrolysis as well as comparison of their experimental CD (circular dichroism) and calculated ECD (electrostatic circular dichroism) spectra. Based on analysis of and/or Cotton effect (CE) data of -, two simple roles to assign location and/or configuration of -glycopyranosyloxy and 1'-(phenyl)ethyl units in the indole alkaloid glycosides are proposed. Stereoselectivity in plausible biosynthetic pathways of - is discussed. Compounds and and their mixture in a 3:2 ratio showed activity against KCNQ2 in CHO cells. The mixture of and (3:2) exhibited antiviral activity against influenza virus H1N1 PR8 with IC 64.7 μmol/L (ribavirin, IC 54.3 μmol/L), however, the individual or was inactive. Preliminary structure-activity relationships were observed.

2.
Acta Pharmaceutica Sinica B ; (6): 933-943, 2018.
Article in English | WPRIM | ID: wpr-775013

ABSTRACT

Five new sulfur-enriched alkaloids isatithioetherins A-E (-), and two pairs of scalemic enantiomers (+)- and (-)-isatithiopyrin B ( and ) and isoepigoitrin and isogoitrin and ), along with the known scalemic enantiomers epigoitrin and goitrin ( and ), were isolated and characterized from an aqueous extract of the roots. Their structures were determined by extensive spectroscopic data analysis, including 2D NMR and theoretical calculations of electronic circular dichroism (ECD) spectra based on the quantum-mechanical time-dependent density functional theory (TDDFT). Compounds - represent a novel group of sulfur-enriched alkaloids, biogenetically originating from stereoselective assemblies of epigoitrin-derived units. Isolation and structure characterization of and support the postulated biosynthetic pathways for the diastereomers and a rare thio-Diels-Alder reaction. Compounds and showed antiviral activity against the influenza virus A/Hanfang/359/95 (H3N2, IC 0.60 and 1.92 μmol/L) and the herpes simplex virus 1 (HSV-1, IC 3.70 and 2.87 μmol/L), and also inhibited Coxsackie virus B3 (IC 0.71 μmol/L).

3.
Acta Pharmaceutica Sinica B ; (6): 409-419, 2018.
Article in English | WPRIM | ID: wpr-690898

ABSTRACT

Eight new C-diterpenoid alkaloid arabinosides, named aconicarmichosides E-L (-), were isolated from an aqueous extract of the lateral roots of (Fu Zi). Their structures were determined by spectroscopic and chemical methods including 2D NMR experiments and acid hydrolysis. Compounds -, together with the previously reported four neoline 14--arabinosides from the same plant, represent the only examples of glycosidic diterpenoid alkaloids so far. At a dose of 1.0 mg/kg (i.p.), as compared with the black control, compounds , , and - exhibited analgesic effects with >65.6% inhibitions against acetic acid-induced writhing of mice. Structure-activity relationship was also discussed.

4.
Acta Pharmaceutica Sinica B ; (6): 46-54, 2016.
Article in English | WPRIM | ID: wpr-309986

ABSTRACT

Three new sesquiterpene glycosides, named codonopsesquilosides A-C (1-3), were isolated from an aqueous extract of the dried roots of Codonopsis pilosula. Their structures including absolute configurations were determined by spectroscopic and chemical methods. These glycosides are categorized as C15 carotenoid (1), gymnomitrane (2), and eudesmane (3) types of sesquiterpenoids, respectively. Compound 1 is the first diglycoside of C15 carotenoids to be reported. Compound 2 represents the second reported example of gymnomitrane-type sesquiterpenoids from higher plants. The absolute configurations were supported by comparison of the experimental circular dichroism (CD) spectra with the calculated electronic CD (ECD) spectra of 1-3, their aglycones, and model compounds based on quantum-mechanical time-dependent density functional theory. The influences of the glycosyls on the calculated ECD spectra of the glycosidic sesquiterpenoids, as well as some nomenclature and descriptive problems with gymnomitrane-type sesquiterpenoids are discussed.

5.
Chinese Journal of Hematology ; (12): 51-55, 2016.
Article in Chinese | WPRIM | ID: wpr-234034

ABSTRACT

<p><b>OBJECTIVE</b>To study the promoter methylation status of SFRP genes and the effect of 5- aza- 2'- deoxycytidine (5- Aza- CdR)induced apoptosis via Wnt/β- catenin pathway by demethylation in Jurkat cells.</p><p><b>METHODS</b>Jurkat cells were treated with different concentrations of 5- Aza- CdR. The cell proliferation level of Jurkat cells was detected by MTT assay. Apoptosis was evaluated by flow cytometry. Methylation- spcific PCR (MSP) was used to determine the methylation status of SFRP genes. The expressions of SFRP genes were detected by real time fluorescence quantitative PCR. The mRNA expression levels of survivin, c- myc and cyclin- D1 were analyzed by RT- PCR. Western blot was used to detect the levels of β-catenin protein.</p><p><b>RESULTS</b>Compared with control group, the different concentrations of 5-Aza-CdR could significantly inhibit the proliferation of Jurkat cells in a time-dose dependent manner (P<0.05). After being treated by 5- Aza- CdR for 48 hours, the cell early apoptosis rate in experiment group was significantly higher than that in control group (P<0.05). The promoters of SFRP1, SFRP2, SFRP4, SFRP5 genes were hypermethylation state in the control group, after being treated by 5-Aza-CdR for 72 hours, the brightness of SFRP1, SFRP2, SFRP4, SFRP5 genes' methylation strips weakened in a dose- dependent manner. SFRP mRNA expression increased (P<0.05) when 5- Aza- CdR concentration increased, and the level of β- catenin protein was dampened in a dose- dependent manner (P<0.05). As compared to the control group, the mRNA expressions of associated apoptosis genes survivin, c-myc and cyclin- D1, respectively were obviously down- regulated in a dose- dependent manner (P<0.05).</p><p><b>CONCLUSION</b>The effect of demethylation could up- regulate SFRP genes expressions by reversing its hypermethylation and induced apoptosis by down-regulation of β-catenin and associated apoptosis genes.</p>


Subject(s)
Apoptosis , Azacitidine , Pharmacology , Cell Proliferation , DNA Methylation , Down-Regulation , Gene Expression , Humans , Intercellular Signaling Peptides and Proteins , Genetics , Jurkat Cells , Membrane Proteins , Genetics , Promoter Regions, Genetic , Wnt Signaling Pathway , beta Catenin , Metabolism
6.
Acta Pharmaceutica Sinica B ; (6): 215-222, 2015.
Article in English | WPRIM | ID: wpr-310033

ABSTRACT

Four new acetylenes (1-4) and one new unsaturated ω-hydroxy fatty acid (5), together with 5 known analogues, were isolated from an aqueous extract of Codonopsis pilosula roots. Their structures were determined by spectroscopic and chemical methods. The new acetylenes are categorized as an unusual cyclotetradecatrienynone (1), tetradecenynetriol (2), and rare octenynoic acids (3 and 4), respectively, and 3 and 4 are possibly derived from oxidative metabolic degradation of 1 and/or 2. The absolute configuration of 1 was assigned by comparison of the experimental circular dichroism (CD) spectrum with the calculated electronic circular dichroism (ECD) spectra of stereoisomers based on the quantum-mechanical time-dependent density functional theory, while the configuration of 2 was assigned by using modified Mosher׳s method based on the MPA determination rule of Δδ RS values for diols.

7.
Acta Pharmaceutica Sinica B ; (6): 350-357, 2015.
Article in English | WPRIM | ID: wpr-310016

ABSTRACT

Seven new 4-hydroxybenzyl-substituted amino acid derivatives (1-7), together with 11 known compounds, were isolated from an aqueous extract of the rhizomes of Gastrodia elata Blume. Their structures were determined by spectroscopic and chemical methods. Compounds 1-3 are pyroglutamate derivatives containing 4-hydroxybenzyl units at the N atom and 4-7 are the first examples of natural products with the 4-hydroxybenzyl unit linked via a thioether bond to 2-hydroxy-3-mercaptopropanoic acid (4-6) and 2-hydroxy-4-mercaptobutanoic acid (7), which would be biogenetically derived from cysteine and homocysteine, respectively. The structures of 1 and 2 were verified by synthesis, while the absolute configurations of 4, 5 and 7 were assigned using Mosher's method based on the MPA determination rule of Δδ RS values. The known compound 4-(hydroxymethyl)-5-nitrobenzene-1,2-diol (8) exhibited activity against Fe(2+)-cysteine induced rat liver microsomal lipid peroxidation with IC50 values of 9.99×10(-6) mol/L.

8.
Article in Chinese | WPRIM | ID: wpr-387611

ABSTRACT

Objective To investigate the relationship between promoter hypermethylation of secreted frizzled-related protein (SFRP) gene and acute leukemia (AL). Methods We examined the promoter methylation starus of SFRP1, 2, 4 and 5 in primary or relapsed AL patients, cell lines ( HL60,NB4, Molt-4 and Jurkat) and peripheral blood mononuclear cells from healthy people with methylationspecific PCR (MSP). Results None of the normal mononuclear cells showed methylation of any SFRP genes. The frequencies of aberrant methylation among the samples were 33.9% (20/59) for SFRP1,23.7%(14/59) for SFRP2, 6. 8% (4/59) for SFRP4 and 10. 2% (6/59) for SFRP5 in acute myelocytic leukemia (AML), and 39.3% (11/28) for SFRP1, 28.6% (8/28) for SFRP2, 25.0% (7/28) for SFRP4 and 32. 1% (9/28) for SFRP5 in acute lymphoblastic leukemia (ALL). Hypermethylation of SFRP1, 2, 5genes were present in the 4 AL cell lines. SFRP4 was methylated in NB4, Molt-4 and Jurkat cell lines.However, methylation and unmethylation of SFRP4 were both detected in HL60. Conclusions Hypermethylation of SFRP genes is a common event in the evolution of AL. Methylation of SFRP genes might serve as potential independent biomarkers for early detection of AL.

9.
Journal of Leukemia & Lymphoma ; (12): 412-414,417, 2010.
Article in Chinese | WPRIM | ID: wpr-601652

ABSTRACT

Objective To investigate the inhibition of proliferation and the regulation of histone acetylation modification in Jurkat cells treated by sodium valproate(VPA). Methods Jurkat cells were treated with VPA.Cell proliferation was determined by CCK-8 assay, and cell cycle were analyzed by flow cytometry (FCM). mRNA of HDAC1 was detected by semi-quantitative RT-PCR, and protein expression of HDAC1 and acetylation of histone H3, H4 was examined by Western blotting. Results VPA inhibited the proliferation of Jurkat cells in concentration-and time-dependent manners. After exposure to VPA in different concentrations for 48h,cell cycle was arrested obviously at G0/G1 phase (P <0.05), and with increasing concentration, the percentage of G0/G1 phase cells was increased and that of S phase were decreased. HDAC1 mRNA expression were inhibited with the increasing concentration of VPA. The protein level of HDAC1 was down-regulated, while acetylation of histone H3、H4 was up-regulated in Jurkat cells by VPA. Conclusion VPA can inhibit proliferation of Jurkat cells and induce G0/G1 phase arrest. The mechanism may be that VPA increase acetylation of histone H3/H4 by inhibiting expressions of HDAC1 gene.

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