Delayed-Action Preparations ; Drug Carriers ; Drug Delivery Systems ; Lactic Acid ; Microspheres ; Nanotechnology ; Polyesters ; Polymers ; Technology, Pharmaceutical ; methods

OBJECTIVETo constitute a model of B immunoblastic lymphomas in the Hu-PBL-SCID mice.

METHODSThe SCID mice were reconstituted by intraperitoneal injection (i.p.) of 5 x 10(7) human lymphocytes from Epstein-Barr virus (EBV) seronegative individuals. After one week, the SCID mice were inoculated with EBV by i.p. injection, and subjected to the investigation of whether there was any tumor in the abdomen of such SCID mice four weeks later. The characteristics of the found tumor was observed by the methods of Hematoxylin-eosin (HE) stain, immunohistochemical staining and polymerase chain reaction (PCR).

RESULTSCompared with the control groups, all the EBV-infected Hu-PBL-SCID mice had abdominal solid tumors [(32 +/- 12.5) mm3] developed, often located in the liver. HE staining and immunohistochemical staining showed the tumors were human B cell lymphomas. EBV DNA could be detected in the tumors by the PCR.

CONCLUSIONSThe model of B immunoblastic lymphomas in the Hu-PBL-SCID mice is successfully constituted, and may well be useful to the human tumor immunological study.

Animals ; Disease Models, Animal ; Herpesvirus 4, Human ; physiology ; Humans ; Lymphoma, Large-Cell, Immunoblastic ; Mice ; Mice, SCID

Objective To explore the correlation between MSCT perfusion parameters and biologic characters in nasopharyngeal carcinoma(NPC),and to investigate the clinical utility of MSCT perfusion for NPC.Methods Nasopharynx in 49 cases was studied using MSCT perfusion imaging,including 30 NPC cases before radiotherapy,14 post-radiotherapy NPC cases,and 5 cases of normal nasopharynx as controls. The perfusion data of tumors and nasopharyngeal wall such as blood flow(BF),peak enhancement index (PEI),time to peak (TTP),and blood volume (BV)were calculated.MVD defined by CD34 stain was counted in 16 cases of NPC.The correlation of MSCT perfusion parameters,MVD,and clinical stage was analyzed.Results 1 case of NPC failed in CT perfusion exam.In NPC group (n=29),BF,PEI,TTP, and BV were (48.6?16.9)ml?100 g~(-1)?min~(-1),(32.3?7.9)HU,(17.5?4.9)s,and (12.8? 4.4)ml?100 g~(-1),respectively.BF,PEI,TTP,and BV in control group (5 cases)were (15.9? 5.9)ml?100g~(-1)?min~(-1),(12.6?1.3)HU,(22.6?6.9)s,and (3.5?0.5)ml?100 g~(-1), respectively,and those in post-radiotherapy group (14 cases)were (25.2?7.0)ml?100 g~(-1)?min~(-1), (19.8 ?5.9)HU,(22.6?4.3 )s,and (6.1?2.4)ml?100 g~(-1),respectively.The perfusion values in NPC group had significant difference compared with those in the other two groups (P

AIMTo investigate the paclitaxel-loaded nanoparticles of poly(ethylene glycol)-b-poly(D,L-lactic acid) amphiphilic diblock copolymer (PMT).

METHODSPMT was prepared by solid dispersion technique. The average size and size distribution were determined by dynamic light scattering (DLS). The morphology was characterized by transmission electron microscopy (TEM) and 1HNMR. The influences of the copolymer molecular weight and the paclitaxel-fed amount on PMT were studied. Therapeutic effect of PMT was studied on Kunming mice liver cancer H22.

RESULTSPMT showed nanometer size and spherical morphology with core and shell. The sizes of PMT increased with increasing the molecular weight of the hydrophobic segment in PEDLLA or increasing the drug-loaded amount. The tumour inhibiting effect of PMT was similar with that of Taxol.

CONCLUSIONIt will provide an experiment basis for the development of new kind of intravenous administration of paclitaxel.

Animals ; Antineoplastic Agents, Phytogenic ; administration & dosage ; pharmacology ; Delayed-Action Preparations ; Drug Carriers ; Drug Delivery Systems ; Lactic Acid ; Liver Neoplasms, Experimental ; pathology ; Mice ; Microspheres ; Nanotechnology ; Paclitaxel ; administration & dosage ; pharmacology ; Particle Size ; Polyethylene Glycols

Objective To develop a rapid test for the detection of F1 antigen of Yersinia Pestis based on gold-immunochromatography.Methods F1 antibodies were coupled with colloidal gold to prepare collidal gold reagent,which was used to detect F1 antibodies based on double antigen sandwich.The collidal gold reagent was estimated for its sensitivity specificity and stablity in labs and 1798 samples were detected in 17 surveillance spots.Results The reagent was sensitive to 0.0010 g/L F1 antigens.The reagens kept stable when it had been placed at 4℃ or room-temperature for 12 months and did not react to Yersinia pseudotuberculosis and Yersinia enterolitica.In 17 surveillance labs the reagent was used to test 1798 viscera samples from animal.resulting an accordance rate of 97.11%(1746/1798)to bacterial culture and 96.83%(1741/1798)accordance to reverse indirect hemagglutination assay(RIHA),showing a higher detection rate[9.23%(166/1798)]compared with RIHA[6.79%(122/1798)]and bacterial culture[6.28%(113/1798)].Conclusions The collidal gold reagent,sensitive and specific in diagnosing Yersinia pestis infection of both human and animals,is a rapid method in surveillance spot.

OBJECTIVETo study apoptosis and gene FasL expression induced by carbon disulfide in sertoli cells of male rats.

METHODSSertoli cells were exposed to different concentrations of CS(2) (0, 0.36, 0.72, 1.44 micromol/ml) for 24 hours. Survival rate, apoptosis rate, expression level of gene FasL were measured using MTT, FCM, and RT-PCR methods respectively.

RESULTSSertoli cell survival rate decreased as the concentration of CS(2) increased. The survival rate (73.34% +/- 1.39%) was significantly lower than the control group (99.98% +/- 5.48%) when the concentration of CS(2) > or = 1.44 micromol/ml (P < 0.05). Apoptosis rate increased as the CS(2) concentration increased. Apoptosis rate (7.93% +/- 0.43%) was significantly higher when the concentration of CS(2) > or = 1.44 micromol/ml (P < 0.05). Expression level of the FasL significantly increased as the concentrations of CS(2) (P < 0.05).

CONCLUSIONCS(2) is cytotoxic to sertoli cells. It could cause apoptosis of sertoli cells.

Animals ; Apoptosis ; drug effects ; Carbon Disulfide ; toxicity ; Cell Line ; Cell Survival ; Fas Ligand Protein ; metabolism ; Male ; Rats ; Sertoli Cells ; drug effects ; metabolism ; Testis ; cytology

OBJECTIVETo investigate the anatomic variation of nonrecurrent laryngeal nerve (NRLN) and its surgical identification and prevention during thyroidectomy.

METHODSThe database of 5 NRLN cases was analyzed to investigate the difference of operative maneuvers and procedures.

RESULTSAll 5 NRLN were located in the right side. Two cases were found have vocal cord paralysis and 1 case recovered in 3 cases who have NRLN injures.

CONCLUSIONSAny transverse bond should not be cut between vascular and laryngeal except middle thyroid vein. Recurrent laryngeal nerve (RLN) should be dissected during thyroid excision. Cervical pneumogastric nerve should be systematic dissected to detect whether RNLN is exist, if RLN is not exist in the same side.

Adult ; Female ; Humans ; Intraoperative Complications ; prevention & control ; Male ; Middle Aged ; Recurrent Laryngeal Nerve ; anatomy & histology ; Recurrent Laryngeal Nerve Injuries ; Thyroid Diseases ; surgery ; Thyroidectomy ; methods ; Vocal Cord Paralysis ; prevention & control

AIMTo probe into the affection and significance of NO on the expression of P-selectin in renal injury following hind limb ischemia/reperfusion in rats.

METHODSIn accordance with the conventional approaches of our department, the model rats were prepared after they were made to undergo 4 hours or ischemia followed by 4 hours of reperfusion of hind limbs. The Wistar rats were divided into four groups randomly: Control group, LI/R group, L-Arg group and L-NAME group. And then in those four groups of Wistar rats, a series of values of measurement were determined such as: Plasma concentrations of nitric oxide (NO), blood urea nitrogen (BUN) and creatinine (Cr). Furthermore, biochemically there came to the assessment of the values including myeloperoxidase (MPO), NO, total nitric oxide synthase (tNOS), inducible NOS (iNOS) and constitutive NOS (cNOS) of renal tissue in different groups. By the methods of electrophoresis and biochemistry, the urine protein was mensurated. The immunohistochemical method was used to detect the expression of P-selectin protein. The morphologic changes were observed with a microscope.

RESULTSAfter hind limbs had suffered from ischemia/reperfusion for 4 hours, there was the occurrence of a series of results such as in the following which were based on the comparison between plasm of LI/R group and control group. The values of NO, BUN and Cr increased significantly, and the trend of indexes such as NO in renal tissue was similar to that in plasma. The values of MPO, tNOS and iNOS in renal tissue all increased significantly after reperfusion, while cNOS decreased distinctly. The urine protein appeared, especially large molecular weight protein. Renal pathology revealed that after LI/R there were edema and infiltration of polymorphonuclear neutrophil (PMN). Immunohistochemically, the expression of P-selectin was upregulated significantly. Compared with LI/R rats, all injury changes were alleviated in L-Arg group. Morphologic changes were mild. Both the content of urine protein and the percentage of apoptosis cell decreased. The expression of P-selectin was downregulated. In L-NAME group, all injury changes got worse. Immunohistochemical results showed strong positive staining of P-selectin.

CONCLUSIONThe renal injury after LI/R may relate to the strong expression of P-selectin. NO may have protective affection by decreasing the expression of P-selectin and alleviating the adhesion, aggregation and infiltration of neutrophils.

Animals ; Kidney ; metabolism ; pathology ; Male ; NG-Nitroarginine Methyl Ester ; adverse effects ; Nitric Oxide ; blood ; P-Selectin ; metabolism ; Rats ; Rats, Wistar ; Reperfusion Injury ; metabolism ; pathology

OBJECTIVETo understand the molecular biological characteristics in order to analyse the genetic background of Yersinia pestis in China.

METHODSPrimary datum on ribotyping, pulsed field gene electrophoresis (PFGE), random amplified polymorphic DNA (RAPD) and insertion sequence (IS) of Yersinia pestis were used and under cluster analysis. Genetic interval and various methods of recognized molecular feature between different strains were evaluated.

RESULTSRibotypes the PFGE types seemed to be corresponding. Stains from Microtus fuscus and area in Tibet Zhongba belonged to 7 copy rRNA gene and the genetic interval were the far more with 6 copy rRNA gene stains, and not definite with RAPD, but with many exceptions. The genetic interval between strains were showed by resemble value.

CONCLUSIONYersinia pestis in China had its own manifold, particular molecular biological characteristics due to natural barriers, geographical complex, circumstances in Tianshan Mountains and Gandise Mountains areas. Yersinia pestis were limited to separateness, evoluted only in certain areas to form a great many gene types.

Animals ; China ; Cluster Analysis ; DNA, Bacterial ; genetics ; Electrophoresis, Gel, Pulsed-Field ; Genetic Drift ; Genotype ; Geography ; Humans ; Mice ; Random Amplified Polymorphic DNA Technique ; Ribotyping ; Yersinia pestis ; classification ; genetics ; isolation & purification

OBJECTIVETo study the single nucleotide polymorphisms in genes associated with the high density lipoprotein (HDL) metabolism in Chinese population.

METHODSTwo hundred and nine normal Han ethnic subjects, aged 59+/-10 years, were recruited from 5 medical centers in western part of China. DNA was extracted by proteinase K digestion, phenol and chloroform extraction as well as isopropanol precipitation. The polymerase chain reaction (PCR)-restriction fragment length polymorphisms (RFLP) in conjunction with sequencing were employed to test the single nucleotide polymorphisms (SNPs) in ATP-binding cassette transporter (ABCA1), cholesteryl ester transfer protein (CETP) and lipoprotein lipase (LPL) genes.

RESULTSThe allelic frequencies of A and G of ABCA1 gene are 53.4% and 46.6%; of B2 and B1 allele of CETP, 41.0% and 59.0%; of HindIII (-) and (+) allele of LPL, 18.9% and 81.1%; and of PvuII(+) and (-) allele of LPL, 66.0% and 34.0%, respectively. All genotype frequencies fit well with the Hardy-Weinberg equilibrium; the significant linkage disequilibrium exists between LPL HindIII(+)and PvuII(+) polymorphisms. All of the RFLP in these genes result from the single nucleic substitution in fragment recognized by corresponding restriction enzymes.

CONCLUSIONThe genetic polymorphisms of ABCA1, LPL-HindIII and LPL-PvuII in Chinese Han ethnic population are significantly different from Caucasians residing in USA or Europe.

ATP Binding Cassette Transporter 1 ; ATP-Binding Cassette Transporters ; genetics ; Aged ; Asian Continental Ancestry Group ; genetics ; Base Sequence ; China ; Cholesterol Ester Transfer Proteins ; genetics ; Female ; Gene Frequency ; Genotype ; Humans ; Linkage Disequilibrium ; Lipoprotein Lipase ; genetics ; Lipoproteins, HDL ; metabolism ; Male ; Middle Aged ; Polymerase Chain Reaction ; Polymorphism, Restriction Fragment Length ; Polymorphism, Single Nucleotide ; Sequence Analysis, DNA