Chemical constituents of the secondary metabolites of endophytic fungi DL02 from Saposhnikovia divaricata and their biological activities / 中成药

AIM To study the chemical constituents of the secondary metabolites of endophytic fungi DL02 from Saposhnikovia divaricata (Turcz.) Schischk.and their biological activities.METHODS The ethyl acetate and methanol extract leavening from S.divaricata was isolated and purified by silica and Sephadex LH-20,then the structures of obtained compounds were identified by physicochemical properties and spectral data.The antifungal and antibacterial activities were determined by the minimum inhibitory concentration method.RESULTS Seven compounds were isolated and identified as β-sitosterol (1),kojic acid (2),stigmasta-7,22-diene-3β,5α,6α-triol (3),uracil (4),allantoin (5),erythritol (6) and adenosine (7).Compound 4 had strong inhibitory effects on pseudomonas aeruginosa with the MIC values of 31.3 μg/mL.CONCLUSION Compounds 2-5 and 7 are isolated from this fungus for the first time.Compounds 4-5 have strong biological activities.

Chemical constituents from Fallopia multiflora / 中成药

AIM To study the chemical constituents of Fallopia multiflora (Thunb.) Harald.var.cillinerve (Nakai) A.J.Li.METHODS The 95％ ethanol extract of the roots from F.multiflora was isolated and purified by silica column and Sephadex LH-20,then the structures of obtained compounds were identified by physicochemical properties and spectral data.RESULTS Ten compounds were isolated and identified as β-sitosterol (1),daucosterol (2),gallic acid (3),succinic acid (4),α-D-glucose (5),Annulatin 3'-O-β-D-xyloside (6),kaempferitrin (7),inotodisaccharide (8),n-butyl-β-D-fructopyranoside (9),erythritol (10).CONCLUSION Compounds 6-10 are isolated from genus Fallopia for the first time,compounds 3-10 are isolated from this plant for the first time.

Chemical constituents from Polygonum posumbu / 中成药

AIM To study the chemical constituents from Polygonum posumbu.METHODS The 95％ ethanol extract from P.posumbu was isolated and purified by silica,Sephadex LH-20 and recrystallization,then the structures of obtained compounds were identified by physicochemical properties and spectral data.RESULTS Fourteen compounds were isolated and identified as n-hexacosanol (1),n-tetradecanoic acid (2),β-sitosterol (3),daucosterol (4),gallic acid (5),quercetin-3-O-(2″-O-galloyl)-β-D-glucopyranoside (6),quercetin-3-O-β-D-glucopyranoside (7),quercetin (8),o-phthalic acid bis-(2-ethyl decyl)-ester (9),inositol (10),sucrose (11),succinic acid (12),n-butyl-β-D-fructopyranoside (13),α-D-glucose (14).CONCLUSION Compounds 1,2,9,10 and 14 are isolated from genus Polygonum for the first time,compounds 1-14 are isolated from this plant for the first time

Chemical constituents from Zanthoxylum bungeanum Dahongpao / 中成药

AIM To study the chemical constituents from Zanthoxylum bungeanum Dahongpao.METHODS The 95％ ethanol extract from Z.bungeanum Dahongpao was purified by silica column and Sephadex LH-20,then the structures of obtained compounds were identified by physicochemical properties and spectral data.RESULTS Nine compounds were isolated and identified as β-sitosterol (1),hydroxy-β-sanshool (2),daucosterol (3),quercetin-3-O-galactoside (4),3-methoxyquercetin (5),succinic acid (6),mannitol (7),arbutin (8),7-O-α-Dglucosyl-3,8-dihydroxy-2-(3-hydroxy-4-methoxyphenyl)-5-methoxy-4H-1-benzopyran-4-one (9).CONCLUSION Compounds 5 and 7 are isolated from genus Zanthoxylum for the first time,compounds 1,3-9 are first isolated from this plant.

Impacts of exposure to 900 MHz mobile phone radiation on liver function in rats / 中国应用生理学杂志

<p><b>OBJECTIVE</b>To study the impacts of exposure to electromagnetic radiation (EMR) on liver function in rats.</p><p><b>METHODS</b>Twenty adult male Sprague-Dawley rats were randomly divided into normal group and radiated group. The rats in normal group were not radiated, those in radiated group were exposed to EMR 4 h/ d for 18 consecutive days. Rats were sacrificed immediately after the end of the experiment. The serum levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST), and those of malondialdehyde (MDA) and glutathione (GSH) in liver tissue were evaluated by colorimetric method. The liver histopathological changes were observed by hematoxylin and eosin staining and the protein expression of bax and bcl- 2 in liver tissue were detected by immunohistochemical method. Terminal-deoxynucleotidyl transferase mediated nick and labelling (TUNEL) method was used for analysis of apoptosis in liver.</p><p><b>RESULTS</b>Compared with the normal rats, the serum levels of ALT and AST in the radiated group had no obvious changes (P>0.05), while the contents of MDA increased (P < 0.01) and those of GSH decreased (P < 0.01) in liver tissues. The histopathology examination showed diffuse hepatocyte swelling and vacuolation, small pieces and focal necrosis. The immunohistochemical results displayed that the expression of the bax protein was higher and that of bcl-2 protein was lower in radiated group. The hepatocyte apoptosis rates in radiated group was higher than that in normal group (all P < 0.01).</p><p><b>CONCLUSION</b>The exposure to 900 MHz mobile phone 4 h/d for 18 days could induce the liver histological changes, which may be partly due to the apoptosis and oxidative stress induced in liver tissue by electromagnetic radiation.</p>

Protective effect of Liuweidihuang Pills against cellphone electromagnetic radiation-induced histomorphological abnormality, oxidative injury, and cell apoptosis in rat testes / 中华男科学杂志

<p><b>OBJECTIVE</b>To observe the effect of Liuweidihuang Pills in relieving cellphone electromagnetic radiation-induced histomorphological abnormality, oxidative injury, and cell apoptosis in the rat testis.</p><p><b>METHODS</b>Thirty adult male SD rats were equally randomized into a normal, a radiated, and a Liuweidihuang group, the animals in the latter two groups exposed to electromagnetic radiation of 900 MHz cellphone frequency 4 hours a day for 18 days. Meanwhile, the rats in the Liuweidihuang group were treated with the suspension of Liuweidihuang Pills at 1 ml/100 g body weight and the other rats intragastrically with the equal volume of purified water. Then all the rats were killed for observation of testicular histomorphology by routine HE staining, measurement of testicular malondialdehyde (MDA) and glutathione (GSH) levels by colorimetry, and determination of the expressions of bax and bcl-2 proteins in the testis tissue by immunohistochemistry.</p><p><b>RESULTS</b>Compared with the normal controls, the radiated rats showed obviously loose structure, reduced layers of spermatocytes, and cavitation in the seminiferous tubules. Significant increases were observed in the MDA level (P < 0.01) and bax expression (P < 0.01) but decreases in the GSH level (P < 0.01) and bcl-2 expression (P < 0.01) in the testis issue of the radiated rats. In comparison with the radiated rats, those of the Liuweidihuang group exhibited nearly normal testicular structure, significantly lower MDA level (P < 0.05), bax expression (P < 0.01), and bcl-2 expression (P < 0.01).</p><p><b>CONCLUSION</b>Liuweidihuang Pills can improve cellphone electromagnetic radiation-induced histomorphological abnormality of the testis tissue and reduce its oxidative damage and cell apoptosis.</p>

Study on the genotyping of 113 Mycobacterium tuberculosis strains isolated in Beijing based on 13 variable number of tandem DNA repeats / 中华流行病学杂志

<p><b>OBJECTIVE</b>Variable Number of Tandem Repeats (VNTRs) analysis was a recently developed method which could serve as a 'real-time' genotyping tool for Mycobacterium tuberculosis. One hundred and thirteen M. tuberculosis isolates from the patients with tuberculosis in Beijing were analysed using the reference method to study the characters of genetic diversity and genotype.</p><p><b>METHODS</b>Thirteen tandem repeat loci (ETR-A, ETR-C, ETR-D, MIRU10, MIRU16, MIRU27, MIRU31, MIRU40, Mtub21, Mtub30, Mtub38, Qublla, Qubllb) in the total genome of MTB were analyzed by PCR and agarose gel electrophoresis method. The characters of the polymorphism of DNA fingerprinting of one hundred and thirteen MTB strains were analyzed with Gel-Pro analyzer 3.1 software and BioNumerics 3.0 software. Results One hundred and thirteen MTB strains were characterized and classified in to four genotype families(type I , type II , type NV, type V ) based on thirteen tandem repeat loci. One hundred and four isolates(92.0%) belonged to type I , the other three genotypes scattered, five strains(4.4%) remaining with type II , while type IV and type V having the same quantity 1.8% (2/113). M. tuberculosis H37Rv belonged to a unattached genotype(type ll ). Conclusion There was obvious length polymorphism in the M. tuberculosis isolates which implied that type I was the epidemic strain clusters in M. tuberculosis in Beijing. VNTRs analysis seemed to be a simple, rapid, sensitive and valuable tool for epidemiological studies of M. tuberculosis complex organisms.</p>