Intervention effect of transcutaneous auricular vagus nerve stimulation on myocardial structural remodeling, electrical remodeling and apoptosis in rat heart failure model with preserved ejection fraction / 中华老年医学杂志

Objective:To observe the effect of percutaneous auricular vagus nerve stimulation on myocardial structural remodeling, electrical remodeling and apoptosis in rats of heart failure with preserved ejection fraction, and to explore the relationship between this effect and oxidative stress.Methods:The arteriovenous fistula was closed by ligation two weeks after establishment in SD rat.By increasing cardiac volume load in the short term, a rat model of heart failure with preserved ejection fraction was constructed.Forty rats were randomly divided into four groups, with 10 rats in each group: sham operation group(S), abdominal aorta-inferior vena cava fistula + closure group(AVF+ L), abdominal aorta-inferior vena cava fistula + closure+ percutaneous auricular vagus nerve stimulation group(AVF+ L+ tVNS)and abdominal aorta-inferior vena cava fistula + closure+ percutaneous auricular vagus nerve stimulation + acetylcholine M 2 receptor antagonist group(AVF+ L+ tVNS+ M -). Rats in the AVF+ L+ tVNS group received percutaneous vagal nerve stimulation on the basis of those in the AVF+ L group.Rats in the AVF+ L+ tVNS+ M - group received daily injection of acetylcholine M 2 receptor antagonist mesotramine(0.5mg/Kg)into tail vein on the basis of those in the AVF+ L+ tVNS group.The parameters of cardiac structural remodeling and electrical remodeling in each group were obtained by cardiac ultrasound and cardiac electrophysiological stimulator.Enzyme-linked immunosorbent assay(ELISA)was used to detect the values of B-type natriuretic peptide precursor(NT-proBNP)and oxidative stress-related indicators in each group.hematoxylin-eosin(HE)staining was used to observe the damage of myocardial structure, disorder of cell arrangement and infiltration of inflammatory cells.Cardiomyocyte apoptosis was observed by TdT-mediated dUTP nick end labeling(TUNEL)staining and apoptosis index was calculated.reverse transcription-polymerase chain reaction(RT-PCR)and Western blotting were used to detect the mRNA and protein expression of B cell lymphoma / leukemia-2(BCL-2)and apoptosis promoting gene(BAX)in BCL-2 gene family. Results:The rats in the AVF + L group developed heart failure characterized by ventricular wall hypertrophy and diastolic dysfunction, and the left ventricular ejection fraction(LVEF)was >50 %.The rat heart failure model with preserved ejection fraction was successfully established.HE staining showed that the myocardial tissue structure damage, cell arrangement disorder and inflammatory cell infiltration were obvious in AVF+ L group, while the pathological changes of myocardial tissue in AVF+ L+ tVNs were significantly less than those in AVF+ L group.Compared with AVF+ L group, in the AVF+ L+ tVNs, the value of NT-proBNP decreased[(301.25 ± 16.07)ng/L vs.(79.33±5.63)ng/L, P<0.05], the value of E/A increased(1.28 ± 0.06 vs.1.66 ±0.05, P<0.05), the expression of BCL-2 mRNA[0.08(0.07, 0.08) vs.0.70(0.64, 0.76), P<0.05]and BCL-2 protein(0.19±0.03 vs.0.46±0.04, P<0.05)both increased, the expression of BAX mRNA(5.00±0.32 vs.2.14±0.36, P<0.05)and BAX protein(0.76±0.04 vs.0.43±0.05, P<0.05)both decreased, while the apoptotic index was also decreased(16.26±0.32 vs.7.04±0.24, P<0.05). Compared with AVF + L group, the indexes of myocardial structural remodeling, electrical remodeling and oxidative stress were decreased in AVF + L + tVNs group(P<0.05). Compared with AVF + L group, there was no significant difference in the above indexes in AVF + L + tVNS + M - group( P>0.05). Conclusions:tVNS can alleviate myocardial structural remodeling, electrical remodeling and apoptosis in HFpEF rats, which may be related to the reduction of oxidative stress response activity.

Cloning and expression analysis of superoxide dismutase SmMSD2 gene from Salvia miltiorrhiza / 药学学报

Superoxide dismutase (SOD) is a key enzyme that scavenge superoxide anion free radical (O2·-) in vivo, and plays an important role in plant growth and development and stress. In this study, according to the genome and transcriptome data of Salvia miltiorrhizae, 9 SOD genes were identified and the expression patterns of SOD family genes were further analyzed, including 5 Cu/Zn-SOD, 2 Fe-SOD and 2 Mn-SOD. On the basis of proteomic analysis, combined with transcriptome data, one full-length cDNA of Mn-SOD gene, namely SmMSD2 was cloned from Salvia miltiorrhizae. The results of amino acid sequence alignment and phylogenetic analysis showed that SmMSD2 protein belongs to the manganese superoxide dismutase (Mn-SOD) subfamily, and SmMSD2 protein shares high sequence identity with the Mn-SOD proteins of various plants that all contain a C-terminal conserved metal-binding domain "DVWEHAYY". The prokaryotic expression vector pMAL-c2X-SmMSD2 was constructed and transformed into E. coli BL21 expressing strain, and the target recombinant protein was successfully induced and its enzymatic properties were analyzed. Spatiotemporal expression analysis showed that SmMSD2 gene was expressed in all tissues, indicating that SmMSD2 gene was constitutively expressed at a stable level. Real-time quantitative PCR indicated that drought (15% PEG6000), abscisic acid (ABA) and indole-3-acetic acid (IAA) could induce the expression of SmMSD2 gene, suggesting that SmMSD2 may be involved in the response of Salvia miltiorrhizae to abiotic stress such as drought, as well as the signaling pathways of phytohormone ABA and IAA. These results lay the foundation for further elucidating the involvement of superoxide dismutase in the stress response and accumulation of active components of Salvia miltiorrhiza.

Cloning, induction pattern and prokaryotic expression of a small heat shock protein SmHSP21.8 gene from Salvia miltiorrhiza / 药学学报

In order to reveal the molecular mechanism of the small heat shock proteins (sHSPs) involved in stress resistance and active ingredients accumulation in Salvia miltiorrhiza, a small heat shock protein gene was cloned from Salvia miltiorrhiza by reverse transcription PCR according to the transcriptome data of orange root Salvia miltiorrhiza. The gene is named SmHSP21.8 based on the molecular weight of the protein, and it contains an open reading frame of 585 bp, which encodes 194 amino acids. The results of phylogenetic analysis and amino acid sequence alignment showed that SmHSP21.8 protein belongs to the endoplasmic reticulum (ER) subfamily, and contains a conserved endoplasmic reticulum-specific DPFR-I/V-LE-H/Q-x-P motif at N-terminus. The prokaryotic expression vector pMAL-c2X-SmHSP21.8 was constructed and transformed into E. coli BL21 competent cells. The recombinant protein was successfully expressed after inducted. Temporal and spatial expression analysis showed that SmHSP21.8 gene was the highest expressed in flowers and had significant tissue specificity. The relative expression of the gene was significantly increased in seedlings after induction by 38 ℃, PEG6000, abscisic acid(ABA), and indole-3-acetic acid (IAA), indicating that SmHSP21.8 gene may be involved in abiotic stress such as high temperature and drought, as well as the response to exogenous hormones ABA and IAA. These results lay the foundation for further research on the molecular mechanism of small heat shock proteins involved in adversity stress.

Application of continuous renal replacement therapy in the treatment of neonates with inherited metabolic diseases / 中国当代儿科杂志

OBJECTIVE@#To study the efficacy and safety of continuous renal replacement therapy (CRRT) in the treatment of neonates with inherited metabolic diseases and hyperammonemia.@*METHODS@#A retrospective analysis was performed on the medical records of neonates with inherited metabolic diseases and hyperammonemia who were hospitalized and underwent CRRT in the Department of Neonatology, Hunan Children's Hospital, from September 2016 to March 2020, including general conditions, clinical indices, laboratory markers, and adverse reactions.@*RESULTS@#A total of 11 neonates were enrolled, with 7 boys (64%) and 4 girls (36%). The neonates had a mean gestational age of (38.9±0.8) weeks, a mean body weight of (3 091±266) g on admission, and an age of (5.7±2.0) days at the time of CRRT. The main clinical manifestations were vomiting (100%), convulsions (100%), and coma (55%), and the main primary disease was urea cycle disorder (55%). The mean duration of CRRT was (44±14) hours, the medium duration of coma before CRRT was 2 hours, and the total duration of coma was 10 hours. The patients had a mean hospital stay of (18±10) days and a survival rate of 73%, and 2 survivors had epilepsy. After treatment, all patients had significant reductions in blood ammonia, lactic acid, and K@*CONCLUSIONS@#CRRT is safe and effective in the treatment of neonates with inherited metabolic diseases and hyperammonemia.

A multicenter survey of antibiotic use in very and extremely low birth weight infants in Hunan Province / 中国当代儿科杂志

OBJECTIVE@#To investigate the current status of antibiotic use for very and extremely low birth weight (VLBW/ELBW) infants in neonatal intensive care units (NICUs) of Hunan Province.@*METHODS@#The use of antibiotics was investigated in multiple level 3 NICUs of Hunan Province for VLBW and ELBW infants born between January, 2017 and December, 2017.@*RESULTS@#The clinical data of 1 442 VLBW/ELBW infants were collected from 24 NICUs in 2017. The median antibiotic use duration was 17 days (range: 0-86 days), accounting for 53.0% of the total length of hospital stay. The highest duration of antibiotic use was up to 91.4% of the total length of hospital stay, with the lowest at 14.6%. In 16 out of 24 NICUs, the antibiotic use duration was accounted for more than 50.0% of the hospitalization days. There were 113 cases with positive bacterial culture grown in blood or cerebrospinal fluid, making the positive rate of overall bacterial culture as 7.84%. The positive rate of bacterial culture in different NICUs was significantly different from 0% to 14.9%. The common isolated bacterial pathogens Klebsiella pneumoniae was 29 cases (25.7%); Escherichia coli 12 cases (10.6%); Staphylococcus aureus 3 cases (2.7%). The most commonly used antibiotics were third-generation of cephalosporins, accounting for 41.00% of the total antibiotics, followed by penicillins, accounting for 32.10%, and followed by carbapenems, accounting for 13.15%. The proportion of antibiotic use time was negatively correlated with birth weight Z-score and the change in weight Z-score between birth and hospital discharge (r=-0.095, -0.151 respectively, P<0.01), positively correlated with death/withdrawal of care (r=0.196, P<0.01).@*CONCLUSIONS@#Antibiotics used for VLBW/ELBW infants in NICUs of Hunan Province are obviously prolonged in many NICUs. The proportion of routine use of third-generation of cephalosporins and carbapenems antibiotics is high among the NICUs.

Progress of antibiotic-loaded bone cement in joint arthroplasty / 中华医学杂志(英文版)

Bone cement, consisting of polymethyl methacrylate, is a bioinert material used for prothesis fixation in joint arthroplasty. To treat orthopedic infections, such as periprosthetic joint infection, antibiotic-loaded bone cement (ALBC) was introduced into clinical practice. Recent studies have revealed the limitations of the antibacterial effect of ALBC. Moreover, with the increase in high infection risk patients and highly resistant microbes, more researches and modification of ALBC are required. This paper reviewed latest findings about ALBC for most popular and destructive pathogens, summarized the influence of antibiotic kind, drug dosage, application method, and environment towards characteristic of ALBC. Subsequently, new cement additives and clinical applications of ALBC in joint arthroplasty were also discussed.

Bionic mechanical design and 3D printing of novel porous Ti6Al4V implants for biomedical applications / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

In maxillofacial surgery, there is a significant need for the design and fabrication of porous scaffolds with customizable bionic structures and mechanical properties suitable for bone tissue engineering. In this paper, we characterize the porous Ti6Al4V implant, which is one of the most promising and attractive biomedical applications due to the similarity of its modulus to human bones. We describe the mechanical properties of this implant, which we suggest is capable of providing important biological functions for bone tissue regeneration. We characterize a novel bionic design and fabrication process for porous implants. A design concept of "reducing dimensions and designing layer by layer" was used to construct layered slice and rod-connected mesh structure (LSRCMS) implants. Porous LSRCMS implants with different parameters and porosities were fabricated by selective laser melting (SLM). Printed samples were evaluated by microstructure characterization, specific mechanical properties were analyzed by mechanical tests, and finite element analysis was used to digitally calculate the stress characteristics of the LSRCMS under loading forces. Our results show that the samples fabricated by SLM had good structure printing quality with reasonable pore sizes. The porosity, pore size, and strut thickness of manufactured samples ranged from (60.95± 0.27)% to (81.23±0.32)%, (480±28) to (685±31) μm, and (263±28) to (265±28) μm, respectively. The compression results show that the Young's modulus and the yield strength ranged from (2.23±0.03) to (6.36±0.06) GPa and (21.36±0.42) to (122.85±3.85) MPa, respectively. We also show that the Young's modulus and yield strength of the LSRCMS samples can be predicted by the Gibson-Ashby model. Further, we prove the structural stability of our novel design by finite element analysis. Our results illustrate that our novel SLM-fabricated porous Ti6Al4V scaffolds based on an LSRCMS are a promising material for bone implants, and are potentially applicable to the field of bone defect repair.

Bionic mechanical design and 3D printing of novel porous Ti6Al4V implants for biomedical applications / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

In maxillofacial surgery, there is a significant need for the design and fabrication of porous scaffolds with customizable bionic structures and mechanical properties suitable for bone tissue engineering. In this paper, we characterize the porous Ti6Al4V implant, which is one of the most promising and attractive biomedical applications due to the similarity of its modulus to human bones. We describe the mechanical properties of this implant, which we suggest is capable of providing important biological functions for bone tissue regeneration. We characterize a novel bionic design and fabrication process for porous implants. A design concept of “reducing dimensions and designing layer by layer” was used to construct layered slice and rod-connected mesh structure (LSRCMS) implants. Porous LSRCMS implants with different parameters and porosities were fabricated by selective laser melting (SLM). Printed samples were evaluated by microstructure characterization, specific mechanical properties were analyzed by mechanical tests, and finite element analysis was used to digitally calculate the stress characteristics of the LSRCMS under loading forces. Our results show that the samples fabricated by SLM had good structure printing quality with reasonable pore sizes. The porosity, pore size, and strut thickness of manufactured samples ranged from (60.95± 0.27)% to (81.23±0.32)%, (480±28) to (685±31) µm, and (263±28) to (265±28) µm, respectively. The compression results show that the Young’s modulus and the yield strength ranged from (2.23±0.03) to (6.36±0.06) GPa and (21.36±0.42) to (122.85±3.85) MPa, respectively. We also show that the Young’s modulus and yield strength of the LSRCMS samples can be predicted by the Gibson-Ashby model. Further, we prove the structural stability of our novel design by finite element analysis. Our results illustrate that our novel SLM-fabricated porous Ti6Al4V scaffolds based on an LSRCMS are a promising material for bone implants, and are potentially applicable to the field of bone defect repair.

Apoptosis-Inducing Effect of Ginsenoside Rh2 on Human Acute T Lymphoblastic Leukemia Jurkat Cells and Its Mechanism / 中国实验血液学杂志

OBJECTIVE@#To investigate the apoptosis-inducing effect of Ginsenoside (Rh2) on human acute T lymphoblastic leukemia Jurkat cells and it mechamism.@*METHODS@#The effects of different concentration of Rh2 (0, 10 , 20, 40 and 80 µg/ml) on the proliferation activity of Jurkat cells were detected by methyl thiazolyl tetrazolium (MTT) method, and the semi-inhibitory concentration (IC) of Rh2 on Jurkat cells at 48 h was calculated. Microscopy and Hoechst 33258 fluorescence staining were used to observe the apoptosis of Jurkat cells treated with IC Rh2 for 48 h. And then, the cell experiment was divided into 4 groups: control, Rh2 (IC), PI3K inhibitor LY294002 (50 µmol/l) and Rh2 (IC) + LY294002 (50 µmol/l). After synchronous culture for 48 h, the apoptosis and cycle changes of Jurkat cells were detected by using PI single staining and Annexin V-FITC/PI double staining, respectively. Western blot was used to detect the expression level of apoptosis-related protein BAX, BCL-2, Cleaved-Caspasase 3, cell cycle-related protein Cyclin D1 and PI3K/AKT signaling pathway-related protein AKT and p-AKT.@*RESULTS@#Rh2 (10-80 µg/ml) inhibited the Jurkat cell proliferation in a dose-time dependent manner (r = 0.999, P＜0.01; r = 0.991; P＞0.05), accompanied by obvious morphological changes of apoptosis cells. Flow cytometry showed that compared with the control group, the cell apoptosis rate in Rh2 or LY294002 group significantly increased, and the cell cycle was mostly blocked in G0/G1 phase. However, the cell apoptosis and cell cycle block in Rh2+LY294002 group were more significant than that in Rh2 and LY294002 group. Western blot showed that compared with the control group, Rh2 significantly promoted the expression of BAX and Cleaved-Caspasase 3, inhibited the expression of BCL-2, Cyclin D1 and p-AKT, furthermore LY294002 significantly promoted this effect.@*CONCLUSION@#Rh2 can induce the apoptosis of Jurkat cells in time-dose dependent manner, moreover, Rh2 also can result in an obvious block of Jurkat cells at G0/G1, that may be closely related to a series of apoptotic signaling cascades mediated by Rh2 inhibiting PI3K/AKT pathway.

Effects of Osthole on Apoptosis of HL-60 Cells Induced by TRAIL and Its Related Mechanism / 中国实验血液学杂志

<p><b>OBJECTIVE</b>To explore the effects of Osthole on apoptosis of HL-60 cells induced by tumor necrosis factor related apoptosis inducing ligand (TRAIL) and its possible mechanism.</p><p><b>METHODS</b>The proliferative inhibition of HL-60 cells treated with different concentrations of Osthole, TRAIL alone and Osthole combined with TRAIL was measured by MTT assay. The HL-60 cells were treated with Osthole, TRAIL alone and Osthole combined with TRAIL at the concentration<ICvalue, i.e. 100µmol/L for Osthole and 40 ng/ml for TRAIL. Apoptosis and mitochondrial membrane potential (MMP) of HL-60 cells were detected by flow cytometry; the mRNA expression of BCL-2, BAX and DR5 was determined by RT-PCR; and the levels of Caspase-3,-8,-9 activity were detected by spectrophotometry.</p><p><b>RESULTS</b>The combined treatment (100µmol/L Osthole + 40 ng/ml TRAIL) of HL-60 cells for 48 h induced an apoptotic rate of (33.9±2.7) %, which was significantly higher than that of cells treated with Osthole or TRAIL alone (P<0.05); at the same time, the combined treatment promoted the decrease of MMP and the expression rate of BCL-2/BAX, and potentiated the expression of DR5 and Caspase-3,-8,-9 activity.</p><p><b>CONCLUSION</b>Osthole can sensitize HL-60 cells to TRAIL-induced apoptosis, which may be related with the activation of mitochondrial pathways and up-regulation of DR5.</p>

Development of Microchip Electrophoresis and Its Applications in Ion Detection / 分析化学

Microchip electrophoresis is emerging as a highly promising method for portability and fast analysis with minimum amount of analytes. This paper reviewed the recent development of microchip electrophoresis, and discussed the structures,materials,processing technologies,surface modification,experimental methods, and application on ion detection. The existing issues and prospects of future study were also discussed.

Synthetic study of vonoprazan fumarate / 国际药学研究杂志

Objective To develop a practical synthetic process of vonoprazan fumarate with high-yield and lower impurities to meet the quality requirements. Methods By using 5-(2-fluorophenyl)pyrrole-3-carboxaldehyde as the starting material,the qualified vonoprazan fumarate was synthesized via the following steps:①N-sulfonylation and the chloride impurity was removed by recrystalli-zation from MeOH;②the aldehyde was converted to amine by reductive amination,followed by forming the vonoprazan chloride to re-move the dimethylamino impurity;③vonoprazan free base was obtained by neutralization and then converted to fumarate at room tem-perature and finally recrystallized from MeOH/H2O(1:1). Results An impurity controllable synthetic process was developed with a 4％total yield improving. The final product was confirmed by ESI-MS and 1H NMR. Conclusion The synthetic process with single im-purity less than 0.1％and purity above 99.5％was obtained and suitable for scale production of vonoprazan fumarate.

Association between platelet-activating factor acetylhydrolase gene polymorphisms and gastrointestinal bleeding in children with Henoch-Schönlein purpura / 中国当代儿科杂志

<p><b>OBJECTIVE</b>To study the association between the single nucleotide polymorphisms (SNPs) of the ninth exon Val279Phe of platelet-activating factor acetylhydrolase (PAF-AH) gene and gastrointestinal bleeding in children with Henoch-Schönlein purpura (HSP).</p><p><b>METHODS</b>A total 516 children with HSP were enrolled, among whom 182 had gastrointestinal bleeding and 334 had no gastrointestinal bleeding. PCR was used to investigate the distribution of genotypes and alleles in the SNPs of Val97Phe. The plasma PAF-AH activity was measured, as well as the levels of platelet-activating factor (PAF), granular membrane protein-140 (GMP-140), β-thromboglobulin (β-TG), and platelet factor 4 (PF4).</p><p><b>RESULTS</b>The Val279Phe genotype and allele frequencies were in Hardy-Weinberg equilibrium, and the homozygous genotype TT and heterozygotes accounted for 0.97% and 6.05% respectively. The gastrointestinal bleeding group had a significantly higher allele frequency than the control group (5.22% vs 3.33%; P<0.01). The HSP patients with GG genotype in the gastrointestinal bleeding group had significantly higher levels of plasma PAF and GMP-140 than those in the non-gastrointestinal bleeding group (P<0.05), while the non-gastrointestinal bleeding group had a significantly higher PAF-AH activity than the gastrointestinal bleeding group (P<0.05). There were no significant differences in β-TG and PF4 between the two groups (P>0.05).</p><p><b>CONCLUSIONS</b>Val279Phe gene polymorphisms in PAF-AH are associated with PAF-AH activity and PAF and GMP-140 levels and may be a risk factor for HSP with gastrointestinal bleeding.</p>

Influence of neurtophil elastase on sperm quality in male infertile patients / 国际检验医学杂志

Objective To explore the relationship between sperm quality and neurtophil elastase (NE) in male infertile patients . Methods the NE concentration was detected in1 30 male infertile patients ,the research subjects were classified into 3 groups based on the neurtophil elastase concentration :neurtophil elastase concentration more than 1 000 ng/mL (group A ) ,250-1 000 ng/mL (group B) less than 250 ng/mL (group C) .Then sperm basic parameters and biochemical markers (phosphatase ,citrate ,zinc and fructose) were detected .Results (1) The sperm density and motility showed statistically significant differences among the group A ,B and C(P0 .05) .(2) There were statistically significant differences in the levels of phosphatase ,citrate and zinc among three groups (P0 .05) .Conclusion The NE level in semen has significant reverse correlation with sperm density ,sperm motility and bi‐ochemical markers (phosphatase ,citrate and zinc) ,implying that semen NE has significantly negative effect on the sperm quality , thus affecting male fertility ability .

Protective effect of extract from Shuilu Erxiandan on oxidative injury of structure and function of human sperm membrane / 国际检验医学杂志

Objective To explore the mechanism of Shuilu erxiandan against male′s infertility and asthenoospermia .Methods Human sperm with normal physiological function were collected ,and then sperm suspension were divided into the normal group ,the model group ,Vitamin C group and the groups of large ,medium and small dose of Shuilu erxiandan .The reactive of species was made from hypoxanthine-xanthine oxidase .In the oxygen environment ,Vitamin C(0 .25 g/L) and different content (1 .0 ,0 .5 ,0 .25 g/mL) of extract from Shuilu erxiandan were hatched with sperm .Then the function of sperm membrane in every group was evalu-ated using hypoosmoticswelling .Meanwhile the content of MDA and SOD were detected .Results Expansion of sperm and sperm motility in all the groups of vitamin C and large ,medium and small dose of Shuilu erxiandan′s extract were significantly higher than that in the model group at time point of 1 ,3 and 6 h (P< 0 .05) .Also ,medium dose of Shuilu erxiandan (0 .5 g/mL) displayed more effective on expansion of sperm and sperm motility compared with that in the vitamin group C (P< 0 .05) .All the groups of vitamin C and large ,medium and small dose of Shuilu erxiandan′s extract significantly indicated descreased MDA content and improved SOD activity compared with that in the model group (P< 0 .05) .Also ,this effect of medium dose of Shuilu erxiandan (0 .5 g/mL ) on MDA and SOD activity were superior to that in vitamin C group ,which showed significant difference (P< 0 .05) .Conclusion Ex-tract from Shuilu erxiandan could significantly protect structure and function of sperm membrane ,which is correlated with interve-ning its lipin peroxidation .

Spontaneous intramural hemorrhage in a patient with severe hemophilia A

No abstract available.

Effects of guipi pill on bone marrow cell cycle of mice exposed to benzene / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To observe the effects of Guipi Pill (GPP) on bone marrow cell cycle of mice exposed to benzene and to explore its possible mechanisms for regulating hematopoiesis.</p><p><b>METHODS</b>Seventy-two Kunming mice were randomly divided into 6 groups, i.e., the normal control group, the model group, the Western medicine treatment group, the large, middle, and small dose GPP groups, 12 in each group. The mice were exposed to manually simulated high concentrations of benzene fqr eight h every day, fourteen successive days, to replicate benzene intoxication model. Mice in the large, middle, and small dose GPP groups were administered with 8, 4, 2 mg/kg GPP per day respectively by gastrogavage. Mice in the Western medicine treatment group were administered with leucogen (at the daily dose of 1.5 mg/kg) and batyl alcohol (at the daily dose of 5 mg/kg) by gastrogavage. Mice in the model group and the normal control group were administered with normal saline by gastrogavage, once daily, for 3 successive weeks. The nucleated bone marrow cell count and the cell cycle of bone marrow cells were detected using flow cytometry.</p><p><b>RESULTS</b>Compared with the normal control group, the nucleated bone marrow cell count obviously decreased in the model group (P <0.05). Compared with the model group, the nucleated bone marrow cell count obviously increased in the large and small dose GPP groups, and the Western medicine treatment group (P <0.01). Compared with the normal control group, the S phase cell ratio and proliferation index (PI) increased, and the G0/G1 phase cell ratio decreased in the model group, showing statistical difference (P <0.05). The G0/G1 phase cell ratio decreased, while the G2/M phase cell ratio and PI increased in the large dose GPP group. The S phase cell ratio decreased in the middle dose GPP group, showing statistical difference when compared with the model group (P <0.01, P <0.05). Compared with the Western medicine treatment group, the G2/M phase cell ratio and PI increased, and the G0/G1 phase cell ratio decreased in the large dose GPP group, showing statistical difference (P <0.01).</p><p><b>CONCLUSION</b>GPP could promote the recovery of hematopoietic functions of benzene exposed mice by ending off G1 or G2-phase arrest, accelerating G0/G1-S phase and S-G2/M phase transition, promoting the proliferation of bone marrow hematopoietic cells, and improving the peripheral hemogram.</p>

Study on protective effect of acteoside on cellular model of Alzheimer's disease induced by okadaic acid / 中国中药杂志

<p><b>OBJECTIVE</b>To investigate the effect of acteoside on SK-N-SH nerve cell injury induced by okadaic acid (OA).</p><p><b>METHOD</b>SK-N-SH nerve cells were processed with 20 nmol * L OA to establish the Alzheimer's disease (AD) cellular model, and 5, 10, 20 mg . L-1 acteoside was used to antagonize against its effect. Cell morphology was observed under inverted microscope. The cell survival rate was detected with MTT, and the LDH release rate was measured by enzyme label kit. Western blot was applied to determine the expression of phosphorylation tau proteins in nerve cells.</p><p><b>RESULT</b>The acteoside could significantly improve SK-N-SH cell morphology, enhance the cell survival rate, decrease the cell LDH release rate and the expression of phosphorylated tau proteins at p-Ser 199/202 and p-Ser 404 sites, up-regulated the expression of at non-phosphorylated tau proteins at Ser 202 site and Ser 404 sites.</p><p><b>CONCLUSION</b>Acteoside has significant protective effect on nerve cell injury induced by OA.</p>

Analysis of reason and strategy for the failure of posterior pedicle screw short-segment internal fixation on thoracolumbar fractures / 中国骨伤

<p><b>OBJECTIVE</b>To analyze the reason and strategy for failure of posterior pedicle screw short-segment internal fixation on thoracolumbar fractures.</p><p><b>METHODS</b>From March 2008 to December 2010,the clinical data of 18 patients with thoracolumbar fracture failed in posterior pedicle screw short-segment internal fixation were retrospectively analyzed. There were 11 males and 7 females with an average age of 37.2 years (ranged, 19 to 63). The time from the first operation to complication occurrence was from 6 to 44 months with an average of 14.3 months. Of them,fusion failure was in 7 cases (combined with screw breakage in 4 cases), the progressive neuro-dysfunction was in 5 cases,the progressive lumbodorsal pain was in 6 cases. All 18 patients with kyphosis were treated with anterior internal fixation remaining posterior fixation (9 cases) and anterior internal fixation after posterior fixation removal (9 cases).</p><p><b>RESULTS</b>All the patients were followed up from 18 to 50 months with an average of 30.5 months. No intetnal fixation loosening and breakage were found, moreover, X-ray and lamellar CT showed bone healing well. Preoperative, postoperative at 3 months and at final follow-up, ODI score was respectively 31.6+/-5.1, 8.6+/-5.7, 8.3+/-3.2; VAS score was respectively 7.2+/-2.3, 2.3+/-0.7, 2.1+/-1.1; kyphosis angle was respectively (-21.2/-+7.8 degreeso, (-5.3+/-6.8 degrees ), (-5.8+/-7.8 )degrees. Compared with preoperative data ,above-listed items had obviously ameliorated(P<0.05).</p><p><b>CONCLUSION</b>Treatment of thoracolumbar fracture with posterior pedicle screw short-segment internal fixation may result in the complications such as bone nonunion ,internal fixation breakage and progressive kyphosis. Anterior reconstruction may be a good strategy for the failure of posterior operation.</p>

Structure-based identification of drug-like inhibitors of p300 histone acetyltransferase / 药学学报

A growing body of evidence suggests that p300 histone acetyltransferase plays important roles in cancer cell differentiation and proliferation. Here, we employed structure-based hierarchical virtual screening method to identify novel lead compounds of p300 histone acetyltransferase. From a screening library containing approximate 100 000 diverse druglike compounds, 33 compounds were chosen for experimental testing and one compound, 4-acetyl-2-methyl-N-morpholino-3,4-dihydro-2H-benzo[b][1, 4]thiazine-7-sulfonamide (17), showed as micromolar inhibitor. Based on its predicted binding pose, we investigated its binding characteristics by designing two series of structural modifications. The obtained structure-activity relationship results are consistent with the predicted binding model. We expect that the identified novel p300 histone acetyltransferase inhibitors will serve as starting points for further development of more potent and specific histone acetyltransferase inhibitors.