Objective To investigate in vivo pharmacokinetics and bioequivalence of Meloxicam Chewable Tablets in healthy Beagle's dogs.Method Twelve healthy adult Beagle's dogs were randomized into two groups.Using the double-preparation,double-cycle,cross-over method and administering orally of testing and reference tablet (2 mg) respectively.The plasma concentration of meloxicam was determinated by RP-HPLC.The 3P97 software was adopted to calculate the pharmacokinetic parameters and evaluate the bioequivalence of two preparations.Results The area under the curves (AUC0-96 h) of the testing tablets and innovator tablets were (2.85±0.64) and (2.79±0.48) μg/mL·h.The peak time (Tmax) was (4.33±0.65) and (4.16±0.71) h.The peak concentration (Cmax) was (0.091±0.017) and (0.086±0.021) μg/mL.The half time (t1/2) was (26.08±3.64) and (26.94± 4.21) h.After the double unilateral t test,there was no statistical significance in the difference of lnAUC and lnCmax between the testing tablets and innovator tablets.Conclusion The testing tablets and innovator tablets are bioequivalent.The relative bioavailability of generic tablet is (98.0±9.76)％.

Objective To establish a convenient,accurate and practical method for detection of adefovir dipivoxil resistance-as- sociated mutation in hepatitis B virus:rtA181V/T/S and rtN236T mutations.Methods According to HBV complete sequences in GenBank,two pairs of primers were designed to amplify the region of HBV reverse transcriptase in order to introduce a BglI restriction site upon PCR product of wild type (wt) and a BseDI restriction site upon PCR product of rt236 mutant type.After amplification,the PCR products were digested with BglI and BseDI separately.We used this method to detect wild,rt181 mu- tant,rt236 mutant plasmids and 3 chronic hepatitis B patients' serum with obvious ADV resistance-associated mutations.We also tested the sensitivity of this method by mixing the wild and mutant plasmids in different proportions.Results The method could detect rt181 and rt236 mutations simultaneously.The result of RFLP analysis was in accordance with that of DNA se- quencing and cloning analysis.This method could detect the mutants even when they comprised only 10% of the total virus population.Conclusions The PCR-RFLP method with high sensitivity can detect rt181 and rt236 mutations simultaneously.It can be used for early detection of ADV resistance-associated mutation in hepatitis B virus.

OBJECTIVETo study the resistant rate of hepatitis B virus (HBV) to ADV and the dynamic evolution of HBV in lamivudine (Lam)-resistant chronic hepatitis B (CHB) patients.

METHODSTwenty-three Lam-resistant CHB patients were assigned to a 10mg/d ADV monotherapy for 68-116 weeks. The baseline and different time point blood samples after ADV monotherapy were analyzed for ADV-resistant mutations using direct sequencing of PCR products; the evolution of HBV mutations was examined by clonal analysis of serial samples from one patient infected with ADV-associated resistant HBV strains.

RESULTSThe cumulative incidence of genotypic ADV resistance at weeks 48 and 96 was 4.3% and 10.5% respectively respectively. The evolution analysis of HBV mutant strains in an ADV-resistant CHB patient showed that the proportion of YMDD mutants gradually decreased with rtA181S mutants increasing over time after ADV monotherapy, and that rtA181S+N236T mutants became the predominant strains during prolonged ADV monotherapy. The addition of Lam to the ongoing ADV treatment had poorer antiviral response in the patient with rtA181S or rtA181S+N236T mutant infection; one clone with multi-drug resistant mutations was selected during Lam and ADV combination therapy.

CONCLUSIONIncreased risk of adefovir resistance and selection of multi-drug resistant mutations are associated with long-term ADV monotherapy in patients with Lam-resistant chronic hepatitis B.

Adenine ; analogs & derivatives ; therapeutic use ; Adult ; Antiviral Agents ; therapeutic use ; Drug Resistance, Viral ; Evolution, Molecular ; Female ; Hepatitis B virus ; classification ; drug effects ; genetics ; Hepatitis B, Chronic ; drug therapy ; virology ; Humans ; Lamivudine ; pharmacology ; Male ; Middle Aged ; Organophosphonates ; therapeutic use

BACKGROUNDPrevious studies showed that anti MHC-II monoclone antibody (MAb) only had partial inhibiting effect of alloreactive mixed lymphocyte reaction (MLR) in vitro and it was unsteady and non-persistent. The aim of this research was to determine whether radioactive isotope (188)Re marked MHC-II antibody could benefit the allograft acceptance in transplantation as compared to normal MHC-II antibody.

METHODS188Re was incorporated to 2E9/13F (ab')(2) which is against swine MHC class II antigen (MAb-(188)Re). Porcine peripheral blood mononuclear (PBMC) cells were examined for proliferation and cytokine mRNA expression after stimulation with MHC-II MAb or MAb-(188)Re.

RESULTSThe proliferative response of recipient PBMCs in mixed lymphocyte reaction (MLR) to donor alloantigen showed that the stimulation index of MAb-(188)Re group was significantly lower than the MHC-II MAb group and control (P < 0.05). mRNA expression of interleukin 2, interferon Υ and tumor necrosis factor α (type 1 cytokines) was lower in MAb-(188)Re group than the MHC-II MAb group, while interleukin 10 (type 2 cytokines) was higher in MAb-(188)Re group in the first 24 hours.

CONCLUSIONMAb-(188)Re could help the graft acceptance by inhibiting T cell proliferation, lowering the expression of type 1 cytokines and elevating the type 2 cytokines produced by PBMC.

Animals ; Antibodies, Monoclonal ; chemistry ; pharmacology ; Cell Proliferation ; drug effects ; Interleukin-10 ; genetics ; Interleukin-2 ; genetics ; Isoantigens ; immunology ; Leukocytes, Mononuclear ; drug effects ; radiation effects ; Lymphocyte Culture Test, Mixed ; Mitomycin ; pharmacology ; Radioisotopes ; Reverse Transcriptase Polymerase Chain Reaction ; Rhenium ; Swine ; Tumor Necrosis Factor-alpha ; genetics

OBJECTIVETo investigate the diversity and the distribution of host animal species of hantavirus and the effect on human health in Jiuhua Mountain area, China.

METHODSThe host animal species of hantavirus was surveyed by using the trap method and the species diversity was evaluated by using the Simpson, Shannon-Weaner, and Pielou indices. Hantavirus antigens or antibodies in lung and blood samples of all the captured host animals were detected by direct or indirect immunofluorescence.

RESULTSNine animal species of hantavirus were distributed in the forest ecosystem of Jiuhua Mountain. Of these, Niviventer confucianus and Apodemus agrarius were predominant, and N. confucianus, Rattus norvegicus, and Mus musculus had relatively large niche breadth index values. The host animals in the eastern and western mountain regions shared similar biodiversity index characteristics, predominant species, and species structures. Hantavirus was detected in 5 host animal species in Jiuhua Mountain area, the carriage rate of hantavirus was 6.03%. The average density of host animals in forest areas of the mountainous area was only 2.20%, and the virus infection rate in the healthy population was 2.33%.

CONCLUSIONThe circulation of hantavirus was low in the forest areas of Jiuhua Mountain and did not pose a threat to human health.

Adult ; Altitude ; Animals ; Antibodies, Viral ; blood ; China ; epidemiology ; Disease Vectors ; Hantavirus ; isolation & purification ; Hantavirus Infections ; blood ; epidemiology ; Humans ; Immunoglobulin G ; blood ; Lung ; virology ; Middle Aged ; Population Density ; Risk ; Rodentia ; virology ; Species Specificity ; Young Adult