1.Improved RP-HPLC method for determination of ferulic acid concentration in human serum
Jingqun HUANG ; Xi HUANG ; Li ZHANG ; Rui XU ; Ping REN
Chinese Traditional and Herbal Drugs 1994;0(09):-
Object To develop an improved RP-HPLC method for determining ferulic acid in the human serum. Methods The determination was carried on RP-HPLC, using Kromasil-C 18column, methanol-water-acetic acid (36.4∶63∶0.6) as mobile phase with a flow rate of 1.0 mL/min and at the detection wavelength of 322 nm, and p-hydroxybenzaldehyde was used as internal standard. The serum sample was deproteinized with acetonitrile to extract ferulic acid. Results The calibration curve showed good linearity over the range of 9.94-159.04 ng/mL (r=0.992 5). RSD was less than 10% within day and day-to-day, the average recovery was 99.77% and the minimal concentration in serum was 5 ng/mL. Conclusion This method, which is simple, rapid, sensitive, reproducible and low toxic, is appropriate for the quantitative determination of ferulic acid in the human serum.
2.Effect of aluminum on concentration of calcium in cells of the cerebral cortex.
Rui REN ; Bai-xiang LI ; Yang ZHANG ; Xiao-feng ZHANG ; Shu-ying GAO ; Yan-ping WU
Chinese Journal of Industrial Hygiene and Occupational Diseases 2006;24(3):182-183
Aluminum
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toxicity
;
Animals
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Animals, Newborn
;
Calcium
;
metabolism
;
Cerebral Cortex
;
drug effects
;
metabolism
;
Dose-Response Relationship, Drug
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Female
;
Male
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Rats
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Rats, Wistar
3.Effects of aluminum on the intracellular calcium concentration and the expression of calcium channels in the hippocampus of rats
Rui, REN ; Yang, ZHANG ; Xiao-feng, ZHANG ; Yan-ping, WU ; Bai-xiang, LI
Chinese Journal of Endemiology 2009;28(5):501-504
Objective To dynamically investigate the effects of aluminum on the concentration of free intracellular Ca2+([Ca2+]i) and the expression of calcium channels in the hippocampus of rats. Methods Healthy 64 Wistar rats were taken as the experimental objects. And these rats were randomly divided into 16 groups according to their weights, and were instilled with AlCl3 at 0(control),37.3,74.7 and 248.7 mg/kg respectively. The experimental time exposed to AlCl3 was 45,75,120 d, among which the rats were given AlCl3 for 120 d fed normally for 30 d. The hippoeampus were segregated on day 45,75,120 and 150 d and the[Ca2+]i of hippocampus of rats were detected by fluorospectrophotometer. The expression of Ryanodine receptor 2 (RyR2) mRNA and α1C ubunit of L-type calcium ehannels(L-Ca2+α1C) mRNA were detected by RT-PCR analysis. Results [Ca2+]i was increased by AlCl3 in a dose-and time-dependant manner(F=23.136 and 19.089, P<0.01). There was a synergistic effect between the dose and time in [Ca2+]i (F=2.270, P<0.05). In time of 120,150 days, the [Ca2+]i of rats hippocampus in 37.3[(299.3±48.7), (342.7±35.3)nmol/L], 74.7[(391.2±47.9), (408.1±42.8)nmol/L] and 248.7 mg/kg group[(397.9±55.8), (405.2±22.7)nmol/L] significantly increased compared with control group [(195.1±29.9), (209.1±30.6)nmol/L; P<0.01]. The expression of RyR2 mRNA and L-Ca2+α1C mRNA were increased by AlCl3(F=23.301 and 60.812, P<0.01). The experimental time could lower the expression of L-Ca2+ α1C mRNA (F=6.088, P<0.01), but had no influences on the expression of RyR2 mR NA (F=1.361, P>0.05). There was interaction between the dose of AlCl3 and the time in the expression of L-Ca2+α1C mRNA (F=5.876,P< 0.01). On day 75,120 and 150 of the experiment, the expression of L-Ca2+α1C mRNA in rat hippocampus of 74.7 (1.03±0.16,1.18±0.18,0.92±0.11) and 248.7 mg/kg group(1.89±0.26, 1.25±0.10, 1.07±0.14) also increased compared with control group(0.63±0.09,0.78±0.16,0.69±0.11; P<0.05 or <0.01). On day 45,75, 120 and 150 of the experiment, the expression of RyR2 mRNA in 74.7(0.49±0.06,0.51±0.07,0.57±0.11, 0.47±0.11), 248.7(0.47±0.03,0.52±0.09, 0.70±0.10, 0.78±0.09)mg/kg AlCl3 groups was highly increased compared with control group (0.24±0.07, 0.32±0.04, 0.30±0.06, 0.27±0.06; P<0.05 or<0.01). Conclusion Al increases [Ca2+]i by increasing the expression of the RyR2 mRNA and L-Ca2+α1C mRNA, thus exerts an irreversible neuronal toxicity.
4.Prophylactic effect of TLR5 agonist flagellin on acute graft versus host disease after allogeneic hematopoietic stem cell transplantation and its mechanism.
Xu-Dong GONG ; Liang-Ming MA ; Lei ZHU ; Hui-Min GUO ; Lian-Sheng REN ; Rui-Rui REN ; Hua-Ping ZHANG ; Fen WEI ; Yan-Yan NIU
Journal of Experimental Hematology 2012;20(4):965-970
This study was aimed to investigate the prophylactic effect of Toll like receptor (TLR)5 agonist flagellin on acute graft versus host disease (aGVHD) after allogeneic hematopoietic stem cell transplantation (allo-HSCT) and its possible mechanism. The animal model with allo-HSCT aGVHD was established by using purebred mice (male mouse C57BL/6 as donor, female mouse BALB/c as recipient) with complete-unidentical major histocompatibility antigen. The recipient mice were randomly divided into 3 groups: group 1 in which mice were injected with high purity (95%) flagellin before and after allo-HSCT respectively, group 2 in which mice received allo-HSCT without injection of flagellin, group 3 in which mice were radiated alone. The aGVHD features of mice in group 1 and 2 were observed and compared. The results showed that the typical symptoms of aGVHD appeared in transplanted mice. The death peak of mice in group 2 appeared at day 4-5 after transplantation. The aGVHD symptoms were obviously alleviated and the mean survival time was prolonged significantly in mice group 1 as compared with mice in group 2 (P < 0.05). The comparison of WBC count in peripheral blood of mice in 3 groups before transplantation showed no significant difference (P > 0.05), while WBC count of mice in group 1 and 2 showed the significant difference at days 14 and 21 after transplantation (P < 0.05). The pathological appearances of aGVHD in mice of group 1 were obviously reduced as compared with mice in group 2. The flow cytometric detection of Treg cell/CD4(+) T cell levels at different time before and after transplantation demonstrated that the Treg cell level in mice of group 1 at weeks 2-4 after transplantation significantly increased as compared with mice in group 2 (P < 0.05). It is concluded that flagellin can effectively prevent the aGVHD occurrence after allo-HSCT, reduce the symptoms and pathological changes of aGVHD, obviously prolong mean survival time of mice in group 1. The mechanism of flagellin effect may be associated to increase of Treg cell level in mice after allo-HSCT.
Animals
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Female
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Flagellin
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therapeutic use
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Graft vs Host Disease
;
prevention & control
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Hematopoietic Stem Cell Transplantation
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adverse effects
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methods
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Male
;
Mice
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Mice, Inbred BALB C
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Mice, Inbred C57BL
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T-Lymphocytes, Regulatory
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Toll-Like Receptor 6
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agonists
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Transplantation, Homologous
5.Research progress on immunologic mechanisms of mesenchymal stem cells for treatment of graft-versus-host disease.
Rui-Ping WANG ; Hu CHEN ; Yu-Qing GUO ; Ren-Na WU ; Bin ZHANG
Journal of Experimental Hematology 2011;19(2):550-553
Mesenchymal stem cells (MSC) are the non-hematopoietic stem cells with a multi-differentiation potentials, which has a low immunogenicity and immune regulation ability. MSC immune regulation ability is particularly important, such as MSC can inhibit the activation and proliferation of T, B lymphocytes, NK cells and dendritic cells (DC). Meanwhile, MSC is able to reconstruct the human hematopoietic microenvironment, improving the successful rate of hematopoietic stem cell transplantation. Graft versus host disease (GVHD) is the main factor causing hematopoietic stem cell transplantation-related mortality. Based on the above mentioned properties, MSCs are used to treat autoimmune diseases and GVHD, recently. Therefore, deep exploration of the cellular immune mechanisms of MSC to treat GVHD is particularly important. This review focuses on progress of research related to treatment of GVHD by MSC immune mechanisms and briefly summarizes the status of the clinical studies.
Graft vs Host Disease
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immunology
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therapy
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Humans
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Mesenchymal Stem Cell Transplantation
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Mesenchymal Stromal Cells
;
immunology
6.The therapeutic strategy of humeral supracondylar fracture with never injury in children.
Zhao-ping ZHONG ; Jin CAO ; Rong REN ; Lin-rui PENG ; Qiu CHEN
China Journal of Orthopaedics and Traumatology 2009;22(1):27-28
OBJECTIVETo determine the clinical features and therapeutic strategy of humeral supracondylar fractures with nerve injuries in children.
METHODSFrom June 2000 to December 2006,28 patients of humeral supracondylar fracture (Gartlang III) with never injuries were analyzed. Twenty-four patients were close injuries and the others were open. Sixteen cases (group A)were treated with close reduction and K-wires fixation. Twelve cases (group B)were treated with open reduction and nerve exploration, among them, contusive nerve injuries in 8 cases, incarceration in 3, complete neurotmesis in 1.
RESULTSThe symptoms of nerve injuries of 28 cases recovered completely within 4 to 6 weeks in 13 cases, 8 to 10 weeks in 2 cases and 12 weeks in 1 case in group A, meanwhile, within 4 to 6 weeks in 6 cases, 8 to 10 weeks in 3 cases and 12 to 16 weeks in 3 cases in group B.
CONCLUSIONMost nerve injuries in humeral supracondylar fractures in children can be cured after close reduction of the fracture. Sometimes, open reduction and nerve exploration are necessary, which has important practical significance.
Adolescent ; Child ; Child, Preschool ; Female ; Fracture Fixation, Internal ; Humans ; Humeral Fractures ; surgery ; Male ; Radial Neuropathy ; surgery ; Treatment Outcome
7.Analysis on complications of elastic nail treating children's long bone fractures.
Lu-feng YAO ; Qiu CHEN ; Zhao-ping ZHONG ; Rong-ming XU ; Hao-ran WANG ; Lin-rui PENG ; Rong REN
China Journal of Orthopaedics and Traumatology 2009;22(2):98-100
OBJECTIVETo analyze the reasons on complications of treatment with elastic nail in children's long bone fracture.
METHODSSixty-six cases (75 parts of long bone fratures) were treated by elastic nail including 49 male and 17 female. The age ranged from 3 to 17 years, mean 7.8 years. There were 35 femur fractures (2 cases were hibateral), 20 tibia and fibula fractures (12 cases were tibia fractures), 8 radial fractures (1 case was ulna fracture) and 3 humerus fractures. The cases included 4 open fractures and 62 closed fractures. All cases were fresh fractures, no multi-segmental fractures. Three cases associated with brain and chest injuries. These cases were treated by open or closed reduction and internal fixaion with elastic nail. A cast or brace had been used after operation for a month. Following-up included the function of the joint,the bottom of the nail and the callus. Complications were timely recorded.
RESULTSAll the patients were followed-up for 12 to 29 months, averaged 17 months. The cases occurrenced compilications including 2 cases of nonunion, 2 of new fracture, 1 of displacment, 4 of joint dysfunction, 3 of irritation of the bottom of the nail and 1 malunion.
CONCLUSIONStrict indication, well design,canonical operation is a good way to avoid compliacations. At the same time,early treatment can reduce the sequela.
Adolescent ; Bone Nails ; Child ; Child, Preschool ; Female ; Follow-Up Studies ; Fracture Fixation, Intramedullary ; Fractures, Bone ; complications ; surgery ; Fractures, Closed ; complications ; surgery ; Fractures, Open ; complications ; surgery ; Humans ; Leg Bones ; injuries ; surgery ; Male ; Postoperative Complications ; etiology ; prevention & control ; therapy
8.Imperatorin enhances anti-tumor effect of TRAIL on breast cancer by upregulating expression of DR5 on cell surface
Zheng-Yang XU ; Rui-Ping REN ; Peng WAN ; Zu-Guo YUAN
Chinese Journal of Pathophysiology 2018;34(1):81-86
AIM:To investigate the synergistic effect of imperatorin on enhancing the anti -tumor effect of TNF-related apoptosis-inducing ligand(TRAIL)on breast cancer and the mechanisms.METHODS:T-47D and MCF-7 breast cancer cells were divided into control group ,imperatorin group,TRAIL group,imperatorin+TRAIL group and imperatorin+TRAIL+death receptor 5(DR5)siRNA group.The viability of T-47D and MCF-7 cells was measured by MTT assay. The apoptosis and mitochondrial membrane potential in T-47D cells were analyzed by flow cytometry.Western blot and flow cytometry analysis were performed to evaluate the expression of DR 5 on T-47D cell surface and the activation of caspase-8 and caspase-3.RESULTS:Imperatorin significantly enhanced the inhibition of cell viability induced by TRAIL of T -47D and MCF-7 cells,and significantly increased the apoptosis of T-47D cells induced by TRAIL.Imperatorin treatment ob-viously induced upregulation of DR5 expression and production of reactive oxygen species in the T-47D cells.In addition,imperatorin enhanced the TRAIL-induced damage of mitochondrial membrane potential and activation of caspase -8 and caspase-3.CONCLUSION:Imperatorin enhances the anti-tumor effect of TRAIL on breast cancer via upregulating the ex-pression of DR5.
9.Exploring the hospital scientific research funds administration model based on the lean management concept
Rui LIU ; Jiyu LI ; Ping WANG ; Zhen REN ; Xue YANG ; Jing YU
Chinese Journal of Medical Science Research Management 2018;31(1):8-11
Objective To optimize the science research funding management,improve the quality of scientific research management,as well as scientific research.Methods The concept of lean management and full life cycle were brought in to analyze the problems and shortcomings under the traditional extensive management.A new administration model adopted in the full life cycle management was constructed.Results The management of hospital research funds plays a central part of the hospital scientific research management,which is also the premise to ensure the smooth implementation of hospital scientific research.Conclusions Through the exploration of full life cycle model of scientific research funds management,relevant departments,such as Department of Research,Finance Department,Equipment Department,Hospital Office and so on improved their internal functional communication,data and information can be shared,which helped streamlining the administration of research funding,as well as the plan and supervision of research funding use.
10.A novel mutation in DKC1 gene in a patient with dyskeratosis congenita
Jian-Qin WANG ; Han-Ping WANG ; Yu-Cai WU ; Jian-Jin XIE ; Zhi-Ping XU ; Jian-Rong XU ; Guang-Zheng SUN ; Rui-hua FANG ; Ping MAO ; Ren-shan ZENG
Chinese Journal of Dermatology 1994;0(06):-
Objective To detect the mutation in DKC1 gene in a patient with dyskeratosis congeni- ta.Methods Fifteen exons of DKC1 gene were amplified by polymerase chain reaction (PCR),and the products were screened for mutations by denaturing high performance liquid chromatography (DHPLC) technology,then DNA sequencing was performed for abnormal exons as shown by DHPLC.The gene muta- tions were verified within 100 unrelated male individuals without dyskeratosis congenita.Results An ab- normal DHPLC elution peak was found in exon 12 of DKC1 gene of the patient,but not in other family members or normal individuals.DNA sequencing showed a 1236G→T transition in DKC1 gene in the pa- tient,which resulted in a 412W→C substitution in DKC1.No mutation was found in other family members and normal individuals.Conclusion The 1236G→T transition in the patient is a novel mutation in DKC1 gene,which could be a causative factor of dyskeratosis congenita.