Recent progress in 2-haloacid dehalogenases / 生物工程学报

2-Haloacid dehalogenases (EC 3.8.1.X) catalyze the hydrolytic dehalogenation of 2-haloacids, releasing halogen ions and producing corresponding 2-hydroxyacids. The enzymes not only degrade xenobiotic halogenated pollutants, but also show wide substrate profile and astonishing efficiency for enantiomer resolution, making them valuable in environmental protection and the green synthesis of optically pure chiral compounds. A variety of 2-haloacid dehalogenases have been biochemically characterized so far. Further studies have been made in protein crystal structures and catalytic mechanisms. Here, we review the recent progresses of 2-haloacid dehalogenases in their source, protein structures, reaction mechanisms, catalytic properties and application. We also suggest further research directions for 2-haloacid dehalogenase.

Research progress in anti-diabetic drugs of cytokine / 中国药理学通报

Cytokine(CK)is a kind of low molecular weight solu-ble protein induced by immunogen,mitogen and other irritant a-gents,and is used widely in the field of diseases.Recently,a series of cytokines with anti-diabetic function such as fibroblast growth factors,adipocytokines,intestinal cytokines,epidermal growth factor were subsequently reported.Anti-diabetic drugs of cytokine have been paid much more attention to due to their less adverse reactions,the success of these researches will provide more ways for the treatment of diabetes.This article summarizes the progress in the research and development of anti-diabetic drugs of cell factor.

Polysaccharide from eggs of S. nudus (SEP) prevents cardiomyocyte hypertrophy induced by high glucose and high insulin in vitro in neonatal rat / 中国药理学通报

Aim To study the protective effects of SEP on the hypertrophic myocardial cells induced with high glucose and high insulin and the mechanism. Methods The protein content was assayed with Lowrys meth-od;the cardiomyocytes area was measured by computer photograph analysis system;the expression of ANF and PPAR-α was determined by RT-PCR;APS was select-ed as control drug. Results Compared with conctrol group,the protein content,cardiomyocytes area and the expression of ANF and PPAR-α of high glucose and high insulin group were significantly increased. Com-pared with conctrol group,the SEP of different dosages were able to decrease the protein content, area, the expression of ANF mRNA and PPAR-α mRNA of cul-tured hypertrophic myocadial cells induced with high glucose and high insulin. Conclusion SEP can pre-vent cardiomyocyte hypertrophy induced by high glu-cose and high insulin, which is related to its inhibition on PPAR-α signaling path.

Rituximab in combination with conformal radiotherapy treatment of postoperative primary central nervous system lymphoma / 白血病·淋巴瘤

Objective To analyze the long-term results of rituximab combined with whole brain radiotherapy and 3-dimentional conformal radiotherapy (3D-CRT) in treatment of patients with primary central nervous system lymphoma (PCNSL). Methods 23 postoperative patients younger than 60 years old were treated. Whole brain radiotherapy with dose of 32.4 Gy were performed and lesions were followed by 3D-CRT with dose of 18 Gy.A dose of rituximab (375 mg/m2) was infused on day 1 (once a week for six weeks).The overall survival was analyzed by using Kaplan-Meier.Results 19 patients(82.6 ％) was complete remission 3 patients (13.0 ％) was part remission,14 patients (60.9 ％) was progression-free survival was 26 months (17-34 months). The overall survival was 40 months (29-55 months). Toxicity was moderate without grade 3-4 neurotoxicity toxic events. Conclusions Radiotherapy (whole brain radiotherapy with sequential 3D-CRT)combined with rituximab seems to yield substantial long-term survival with moderate toxicity for the treatment of the younger patients with PCNSL.

Expression and Bioactivity Assay of a Novel Clamworm Antimicrobial Peptide Perinerin in Pichia pastoris / 中国生物工程杂志

A novel antimicrobial peptide, named as perinerin (GenBank accession No. P84117), was isolated and characterized from Asian marine clamworms, Perinereis aibuhitensis Grube. Perinerin showes powerful and broad activity against both grampositive and gramnegtive bacteria in vitro, especially on Pseudemonas aeruginosa. To obtain large amounts of active perinerin and characterize its main physiochemical features, The perinerin weve expressed in Pichia pastoris. Intact perinerin gene amplified by the modified gene SOEing method(Gene splicing by overlap extension)was cloned into expression vector pPICZ?A and obtained recombinant vector pPICZ?APEN, then pPICZ?APEN was expressed in the Pichia pastoris GS115. The expressed sample was analyzed by TricineSDSPAGE. The results showed that Pichia pastoris was a suitable system producing the secreted form of perinerin. Bioactivity assay showed that the recombinant perinerin had marked antimicrobial effects.

Effects of pioglitazone on hypertrophic myocardial cells induced with high glucose and high insulin / 中国药理学通报

Aim To study the effects of pioglitazone on the hypertrophic myocardial cells induced with high glucose and high insulin. Methods Using cultured myocardial cells as a model, The protein content was assayed with Lowrys method; The contracting frequency was counted by the inverted microscope;The protein synthesis was assayed with leucine intake method;The cardiomyocytes volumes was measured by computer photograph analysis system; the cellular hypertrophy was observed. Results Compared with verapamil, Pioglitazone significantly inhibited the protein content, cellular protein synthesis and volumes of cultured hypertrophic myocardial cells induced with high glucose and high insulin. Meanwhile pioglitazone and verapamil inhibited myocardial cells contracting frequency too. Conclusions Pioglitazone inhibited cardiac hypertrophy of cultured myocardial cells induced with high glucose and high glucose. The mechanism of the effect of pioglitazone on cardiac hypertrophy needs further study.

Accelerating effects of high glucose on NE-induced cardiac hypertrophy of the cultured myocardial cells / 中国药理学通报

AIM To study the effects of high glucose on the cardiac hypertrophy,cultured cardiomyocytes were used to study the accelerating effects of high glucose on norepinephrine(NE) induced cardiac hypertrophy. METHODS Using cultured myocardial cells as a model, the cellular hypertrophy was observed. The protein content was assayed with Lowrys method. The cardiomyocytes' volumes was measured by computer photograph analysis system. The protein synthesis was assayed with leucine intake method. RESULTS The total cellular protein content?cellular volumes?cellular protein synthesis showed an increase in high glucose group, NE group, high glucose and NE group compared with control group, respectively. High glucose and NE group showed a further increase compared with NE group. CONCLUSIONS The high glucose itself induced hypertrophy of the cultured myocardial cells slightly. Meanwhile high glucose can further accelerate hypertrophy of the cultured myocardial cells induced with NE. The effective mechanism between high glucose and NE on cardiac hypertrophy need further study.

Progress in research of antitumor mechanisms of marine polysaccharides / 中国药理学通报

polysaccharide has become a research focus in tumor therapy because of possessing positive immunomodulating and antitumor activities.At present,a series of polysaccharides with novel structures and unique function have been isolated from marine resources,which are potential choices for anti-tumor drugs.However,few reviews are reported about the antitumor mechanism of marine polysaccharide,so the progress in research of antitumor mechanisms of marine polysaccharide are reviewed in this paper.