2.Troubleshooting of bioinequivalence of compound valsartan tablets.
Da SHAO ; Yifan ZHANG ; Yan ZHAN ; Xiaoyan CHEN ; Dafang ZHONG
Acta Pharmaceutica Sinica 2014;49(4):524-9
The study aims to evaluate the bioequivalence of valsartan hydrochlorothiazide tablets, and to investigate the potential cause of bioinequivalence. This was a single-center study with an open, randomized double-way crossover design. Test and reference preparations containing 160 mg of valsartan and 25 mg of hydrochlorothiazide were given to 36 healthy male volunteers. Plasma concentrations of valsartan and hydrochlorothiazide were determined simultaneously by LC-MS/MS. The pharmacokinetic parameters and relative bioavailability were calculated, while the bioequivalence between test and reference preparations were evaluated. The dissolution profiles of test and reference preparations in four different mediums were determined via dissolution test and HPLC. The similarity was investigated according to the similarity factors (f2). The F(o-t) and F(0-infinity) were (139.4 +/- 65.2)% and (137.5 +/- 61.2)% for valsartan of test preparations. It led to get the conclusion that test and reference preparations were not bioequivalent for valsartan. A significant difference was observed between test and reference tablets in the valsartan dissolution test of pH 1.2 hydrochloric acid solution. The key factor of the bioinequivalence might be that dissolution of valsartan in acid medium has marked difference between two preparations.
3.Progress on the research of prevention and treatment of renal transplantation rejection by integrative Chinese and Western medicine.
Chinese Journal of Integrated Traditional and Western Medicine 2004;24(8):764-766
Aged
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Animals
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Cyclosporine
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adverse effects
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therapeutic use
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Drugs, Chinese Herbal
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therapeutic use
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Graft Rejection
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drug therapy
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prevention & control
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Humans
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Immunosuppressive Agents
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therapeutic use
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Kidney Diseases
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chemically induced
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prevention & control
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Kidney Transplantation
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Phytotherapy
4.Troubleshooting of bioinequivalence of compound valsartan tablets.
Da SHAO ; Yi-Fan ZHANG ; Yan ZHAN ; Xiao-Yan CHEN ; Da-Fang ZHONG
Acta Pharmaceutica Sinica 2014;49(4):524-529
The study aims to evaluate the bioequivalence of valsartan hydrochlorothiazide tablets, and to investigate the potential cause of bioinequivalence. This was a single-center study with an open, randomized double-way crossover design. Test and reference preparations containing 160 mg of valsartan and 25 mg of hydrochlorothiazide were given to 36 healthy male volunteers. Plasma concentrations of valsartan and hydrochlorothiazide were determined simultaneously by LC-MS/MS. The pharmacokinetic parameters and relative bioavailability were calculated, while the bioequivalence between test and reference preparations were evaluated. The dissolution profiles of test and reference preparations in four different mediums were determined via dissolution test and HPLC. The similarity was investigated according to the similarity factors (f2). The F(o-t) and F(0-infinity) were (139.4 +/- 65.2)% and (137.5 +/- 61.2)% for valsartan of test preparations. It led to get the conclusion that test and reference preparations were not bioequivalent for valsartan. A significant difference was observed between test and reference tablets in the valsartan dissolution test of pH 1.2 hydrochloric acid solution. The key factor of the bioinequivalence might be that dissolution of valsartan in acid medium has marked difference between two preparations.
Administration, Oral
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Adolescent
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Adult
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Angiotensin II Type 1 Receptor Blockers
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administration & dosage
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adverse effects
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blood
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pharmacokinetics
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Antihypertensive Agents
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administration & dosage
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adverse effects
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blood
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pharmacokinetics
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Area Under Curve
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Chromatography, Liquid
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Cross-Over Studies
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Drug Liberation
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Humans
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Hydrochlorothiazide
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administration & dosage
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adverse effects
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blood
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pharmacokinetics
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Male
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Tablets
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Tandem Mass Spectrometry
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Therapeutic Equivalency
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Valsartan
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administration & dosage
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adverse effects
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blood
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pharmacokinetics
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Young Adult
5.The Establishment of an Anti-Trypanosoma Drug Screening System with Leucyl-tRNA Synthetase as an Inhibition Target
Guang-Wei GAO ; Ying YAO ; Da-Zhong DING ; Long YE ; Hu-Chen ZHOU ; Da-Wei LI ;
China Biotechnology 2006;0(12):-
Trypanosoma is a human parasite severely affecting poor tropical areas.However,current frontline drugs for Trypanosoma treatment have severe side-effects with decreased effectiveness.Based on the fact that aminoacyl-tRNA synthetase is a bonafide drug target for several microorganisms,including bacteria and fungi,it is plausible that it may also be effective target of Trypanosoma.The Trypanosoma brucei leucyl-tRNA synthetase(tbLeuRS)was cloned,expressed and purified to develop an in vitro enzymatic assay system.The assay conditions were further optimized for the effective screening of tbLeuRS inhibitors thus establishing an anti-Trypanosoma drug screening system targeting tbLeuRS.The results indicated that this system can be employed for the effective screening of anti-Trypanosoma drugs with satisfactory specificity.In addition,this system can also be used for compound optimization,as well as IC50 testing.Using this system a series of compounds are identified that are effective Trypanosoma inhibitors without toxicity to human cells.Therefore,targeting tbLeuRS may represent a new venue for the development of anti-Trypanosoma drugs.
6.Study on the potential to differentiate into myocytes of the CD34~+ cells
Yunxian CHEN ; Xueyun ZHONG ; Ruiming OU ; Huizhen CHEN ; Weiqiong LUO ; Liye ZHONG ; Da XING ; Zhongcha HAN
Chinese Journal of Pathophysiology 1986;0(02):-
AIM:To investigate the potential of differentiatng into myocytes of the granulocyte colony-stimulating factor(G-CSF)-mobilized CD34 + cells. METHODS: Three hours after intraperitoneal injecction of isoprenaline(ISO) to develop acute ischemic model, rats' bone marrow hematopoietic stem cells were mobilized to the site of myocardial infarction by G-CSF. The techniques of immunohistochemisty and HE stain were used to detect the infiltration of CD34 + cells and the regeneration of myocytes in the infarct zones. RESULTS: 24 hours after administration of ISO , a large amount of infiltrative monocytes and regenerative myocytes which were CD34 positive expression could be found in the infarct zones of the G-CSF treatment group, while majority of the infiltrative inflammatory cells in control group were neutrophils and there was no infiltrative cells and myocytes which were CD34 positive expressio, 2 weeks after administration of ISO, there were a plenty of scar in control group, but not in the G-CSF treatment group. CONCLUSION: G-CSF-mobilized CD34 + cells possess the potential to differentiate into myocytes and it may be used in treating acute myocardial infarction.
7.Determination of γ-aminobutyric acid in human plasma by LC-MS/MS and its preliminary application to a human pharmacokinetic study.
Yao CHEN ; Xiao-Jian DAI ; Jiang-Bo DU ; Kan ZHONG ; Xiao-Yan CHEN ; Da-Fang ZHONG
Acta Pharmaceutica Sinica 2014;49(11):1593-1599
A rapid, sensitive and convenient LC-MS/MS method was developed for the determination of γ-aminobutyric acid (GABA) in human plasma. d2-γ-Aminobutyric acid (d2-GABA) was synthesized as internal standard (IS). After extraction from human plasma by protein precipitation with acetonitrile, all analytes were separated on a Luna HILIC column (100 mm x 3.0 mm, 3 μm) using an isocratic mobile phase of water: acetonitrile: formic acid (20 : 80 : 0.12) with a flow rate of 0.5 mL x min(-1). Acquisition of mass spectrometric data was performed in multiple reaction monitoring mode (MRM) in positive electrospray ionization using the transitions of m/z 104 --> 69 for GABA and m/z 106 --> 71 for d2-GABA. The method was linear in the concentration range of 5.00 to 1 000 ng x mL(-1). The intra- and inter-day precisions were within 9.9%, and accuracy ranged from 99.1% to 104%, within the acceptable limit across all concentrations. The method was successfully applied to a pharmacokinetic study of GABA tablets in healthy Chinese volunteers.
Chromatography, Liquid
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Humans
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Tandem Mass Spectrometry
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gamma-Aminobutyric Acid
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blood
8.The enantioselective pharmacokinetic study of desvenlafaxine sustained release tablet in Chinese healthy male volunteers after oral administration.
Yin-xia CHEN ; Jiang-bo DU ; Yi-fan ZHANG ; Xiao-yan CHEN ; Da-fang ZHONG
Acta Pharmaceutica Sinica 2015;50(4):486-491
A chiral LC-MS/MS method for the simultaneous analysis of desvenlafaxine (DVS) enantiomers in human plasma was developed and applied to a pharmacokinetic study on 12 Chinese healthy volunteers. d6-Desvenlafaxine was used as internal standard (IS). Chromatographic separation was performed on the Astec Chirobiotic V chiral column (150 mm x 4.6 mm, 5 μm). The assay was linear over the concentration range of 0.500-150 ng x mL(-1) for both enantiomers (r2 > 0.99). The method was successfully applied to a stereoselective pharmacokinetic study of 100 mg desvenlafaxine sustained release tablets on 12 Chinese healthy volunteers under fasting conditions. The results showed that the pharmacokinetic parameters were similar to both enantiomers in Chinese healthy volunteers. The AUC(0-t), and C(max) of the two enantiomers were about 1.5 times higher than those of blacks and whites reported in the literature.
Administration, Oral
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Area Under Curve
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Asian Continental Ancestry Group
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Chromatography, Liquid
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Cyclohexanols
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blood
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pharmacokinetics
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Delayed-Action Preparations
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Desvenlafaxine Succinate
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Dose-Response Relationship, Drug
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Healthy Volunteers
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Humans
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Male
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Plasma
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chemistry
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Stereoisomerism
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Tablets
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Tandem Mass Spectrometry
9.Myocardial protective effects of“integrated strategy”with Na~+/H~+ exchange inhibitor (HOE-642) plus modified K/Mg cold blood cardioplegia on canine heart grafts preserved
Da-De HUANG ; Weimin CHEN ; Cheng-Hua ZHONG ; Guangwen CHEN ; Lixin XU ;
Chinese Journal of Organ Transplantation 2005;0(10):-
Objective To investigate the myocardial protective effects of“integrated strategy”with HOE-642 plus modified K/Mg on canine heart grafts.Methods Sixteen donors-recipient pairs of adult canines were divided into the“integrated strategy”group,i.e.,donor hearts were protected with HOE-642 plus K/Mg(IS,n=8)and the routine method(RM,n=8)group.Both groups un- derwent hypothermia stored for 4 h,followed by orthotopic transplantation.Cardiac heamodynamics was measured and myocardial ultrastructure and myocardial water content were evaluated.Results One of 8 animal died of aortic anastomoses leakage in each group,and the rest could wean from car- diopulmonary bypass successfully.Preservation of left ventricular contractility,as well as left ventric- ular compliance was significantly better in the IS group than in the RM group(P<0.05),also,per- centage of myocardial water content was significantly lower in the IS group than in the RM group(P<0.05).Myocardial ultrastructures were not damaged significantly in both groups,however,better myocardial preservation were seen in the IS group.Conclusion Both the clinically used“routine meth- od”and“integrated strategy”might provide safe donor heart preservation for 4 h,but the later scheme conferred more optimal effects with alleviating the myocardial swelling,preserving myocardial ultra- structure integrity and enhancing postischemic-reperfusion cardiac functional recovery.
10.Retrospective analysis of twenty-six patients with primary gastric diffuse large B cell lymphoma:the contribution of rituximab
Kaili ZHONG ; Jing LIU ; Xilin CHEN ; Xiubin XIAO ; Yong DA ; Weijing ZHANG ; Hang SU
Military Medical Sciences 2014;(7):542-546
Objective To analyze the clinical characteristics , diagnosis, therapy and prognosis of new diagnosed pri-mary gastric diffuse large B cell lymphoma ( PGDLBCL) and to discuss the efficacy of rituximab .Methods Between Jan 2005 and May 2012 , twenty-six new-diagnosed PGDLBCL patients were reviewed retrospectively .The clinical characteris-tics, diagnosis, therapy, results and prognostic factors were analyzed .Results There were 14 males and 12 females.Their age ranged from 25 to 82 (median, 50.1) years old.The most common symptom was stomachache .Treatment strategies were chemotherapy alone ( n=9) [ scheduled as cyclophosphamide , doxorubicin , vincristine and prednisone ( CHOP) and CHOP-like] and chemotherapy combined with rituximab (n=17), followed by radiotherapy of the stomach with or without regional nodes .All clinical and pathological features were similar between the two groups .The median follow-up time was 40 months.The overall response rate was 100%(9/9)in CHOP group, including 55.56%(5/9) CR, and 93.75%(15/16) in RCHOP group including 50%(8/16) CR (P>0.05).The total PFS and OS of 5 years were 60.3%and 74.4%respectively.The PFS in CHOP group and RCHOP group was 66.7% and 58.9%, respectively,and the OS was 66.7%and 84.6%, respectively.Although the OS of RCHOP group was much better than that of CHOP group , there was no sta-tistically significant difference.Univariate analysis showed that IPI (P<0.05) and Lugano staging (P<0.05) were inde-pendent factors of survival in patients with PGDLBCL .Conclusion Chemotherapy could be the first-line therapy of PGDL-BCL.The overall survival rate might be increased by adding rituximab to chemotherapy .The Lugano stage and IPI are im-portant prognostic factors .