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Biomedical subjects

J Wu

Publications and source records attributed to J Wu.

At least 487 records · Page 27Linked to original sources
PubMed2000

[Genetic polymorphism of 10 STR loci on chromosome 9 and its forensic application in Chinese population].

OBJECTIVE: To have a thorough knowledge of the genetic polymorphism of 10 short tandem repeats loci of chromosome 9 in Chinese population and its application in forensic science. METHODS: The 9 STR tetrameric loci and one trimeric tandem repeat locus were chosen from Genome Databank. Eighty-three EDTA-blood samples were collected from the unrelated family in Baiyin city, Gansu province. DNA was extracted by Chelex method and amplified by the polymerase chain reaction(PCR). The PCR products were analyzed by PAGE electrophoresis. RESULTS: The polymorphisms of all 10 STR loci have been obtained in Chinese Han population. The 10 STR loci follow the Mendel ns law. CONCLUSION: The data of all 10 STR loci is beneficial to understanding the population genetics of them in Chinese Han population.

Chromosomes, Human, Pair 9↗
PubMed2000

[Studies on the polymorphism of MICA gene in four Chinese populations].

OBJECTIVE: To understand with greater clearness the genetic polymorphism of (GCT)n repeat of MHC class I chain-related gene A (MICA)in some Chinese populations and provide preliminary genetic evidence for the independent origin of Chinese Baima Tibetan (BMT). METHODS: ACD-blood or saliva specimens of 411 unrelated individuals from four Chinese populations were collected. A primer pair spanning exon 5 of MICA gene was used to amplify the GCT region. Alleles were detected by PCR and denaturing PAGE. Comparison of the allelic distributions among the four populations was carried out. RESULTS: Five previously reported alleles have been observed in all the four populations, but the allelic distributions are different from one another. The most frequent allele is the A5 in all the four populations (0.325 in BMT, 0.345 in Tibetans, 0.390 in Chengdu Hans and 0.319 in Qiangs). A5.1 allele is the second most frequent allele in Chengdu Hans (0.230) and in Qiangs (0.293), while the second most frequent alleles for BMT and Tibetans are A4 (0.254) and A9 (0.272) respectively. The distribution of alleles in BMT is significantly different from that in the other three populations. CONCLUSION: Alleles of MICA gene exon 5 are conservative in all populations studied so far. The results suggest that genetically BMT might be an independent ethnic population.

Alleles↗
PubMed2000

[Asymmetric biosynthesis of chiral styrene oxide].

Used styrene as the sole carbon and energy source, 12 strains of aerobic bacterial and two strains of fungi were screened from a series soil samples. These strains were able to convert styrene to styrene oxide. HPLC and chiral GC method were used for determination the substrate, product and e.e value of culture broth. There were obvious effect on the biomass and epoxidase activity under various conditions in the fermentation. Styrene epoxidation of the strain PS-1206 was studied in different reaction time. 35% of conversion yield and 80% e.e value of (R)-styrene oxide could been obtained at the optimum conditions.

Bacteria↗
PubMed2000

[Inhibition of human glioma growth in nude mice by local secretion of angiostatin K(1-3)].

OBJECTIVE: To discuss the feasibility of human glioma therapy by the local secretion of angiostatin K(1-3)[AK(1-3)]. METHOD: AK(1-3) cDNA with secretive signal was inserted into polylinker sites of eukaryotic expression vector pcDNA3 to construct pcDNA-SAK(1-3); The vector was transfected into human glioma SHG44 cells by lipofectamine and the positive clone was screened by G418. The biological characters of glioma cells were examined with electron microscopy and FCM. The activity of AK(1-3) protein expressed by the SHG44 cells was examined by the endotheliocyte inhibition assay and immunofluorescence assay. When the tumor cells were implanted into nude mice, the tumor necrosis and micrangium was calculated by immunohistochemistry and electron microscopy in order to determine the influence of AK(1-3) protein to the human glioma growth. RESULTS: The pcDNA-SAK(1-3) vector was successfully constructed and transfected into glioma cells that could express AK(1-3) protein. The tumorigenesis and angiogenesis of glioma cells in nude mice were greatly reduced (tumour end volume, experiment group 170 mm3, control group 8 120 mm3, P < 0.01; Blood vessel counting, experimental group 5.4, control group 12.2, P < 0.01). CONCLUSION: The human glioma angiogenesis and growth were inhibited by the local secretion of AK(1-3). It can be further used in the treatment of other solid tumors.

Angiostatins↗
PubMed2000

[Analysis of the design principle and mechanics nature of adjustable semi-circular planum external fixator].

This thesis presents our studies of an adjustable semi-circular planum external fixator and offers a relatively detailed introduction and analysis of the structure principle and mechanics nature. Because dual-direction joining pole with active joints was used, by adjusting the length of each pole, it can not only make the two semi-circular steel plates more parallely along the axis line to stabilize the fracture and lengthen the extremity, but it also can change the planum angle of the steel plate, and thus achieve the effect of orthopaedic function.

Equipment Design↗
PubMed2000

[Quantitative study on the expression of mRNA for TGF-beta and collagenase (MMP-1), tissue metalloproteinase inhibitor-1 (TIMP-1) in hypertrophic scar].

OBJECTIVE: To investigate the expression of mRNA for TGF-beta, MMP-1 and TIMP-1 and their effects on the formation of hypertrophic scar (HTS). METHODS: In situ hybridization and image analysis were used in this study. RESULTS: The expressions of mRNA for TGF-beta and TIMP-1 in HTS was greatly increased compared with those of normal skin. The average integral optical density of mRNA for TGF-beta and TIMP-1 increased by 8 and 7 folds (P < 0.001) related to normal skin and the expression of them showed highly positive correlation. CONCLUSIONS: The findings suggest that TGF-beta promotes the expression of TIMP-1 and may be a possible factor for hypertrophic scar formation.

Adolescent↗
PubMed2000

[Concept of ecosystem management and its essential elements].

Ecosystem management originates from the tradition fields of natural resources management and utilization, and develops in the 1990's. Based on our best understanding of the ecosystem composition, structure and function, and in definite spatiotemporal scales, it integrates human values and social-economic principles into managing ecosystems to resotre and/or sustain ecosystem integrity and sustainability. Ecosystem management requires the collection of field data and the monitoring of ecosystem dynamics at multiple scales. The essential elements of ecosystem management include clear management goals, definite ecological boundaries and units, sound ecological understanding, appropriate scale and hierarchic structure, understanding of ecosystem uncertainty, adaptive management, cooperation between agency and individuals, and viewing human and its value as ecosystem components. The goal of ecosystem management focuses on ecosystem sustainbility.

Ecosystem↗
PubMed2000

Effect of 8-bromo-cyclic AMP on neuron specific enolase, heat shock protein, nitric oxide, nitric oxide synthase and nitric oxide synthase mRNA in human retinoblastoma HXO-Rb44 cells and cell differentiation.

OBJECTIVE: To study the effect of 8-bromo-cyclic AMP (8-Br-cAMP) on nitric oxide synthase (NOS) mRNA, NOS and nitric oxide (NO) product, heat shock protein (hsp) 70 and neuron specific enolase (NSE) in human retinoblastoma HXO-Rb44 cells and the effect related to cell differentiation. METHODS: Cultured human retinoblastoma HXO-Rb44 cells were divided into two aliquots. One was cultured with 2 x 10(-5) mol/L of 8-Br-cAMP for 24 hours as the experiment group; the other was treated with no 8-Br-cAMP as the control group. The cell suspensions in concentration of 1 x 10(7)/ml in both groups were dropped onto the nitrocellulose membrane (NCM). The NOS mRNA was detected with the biotin-labeled NOS cDNA probe by RNA dot blot. The NOS activity was detected by protein dot blot. The immunoreactivity (IR) of hsp70 and NSE was detected by protein dot blot. The NO was detected by nitrate reductase method. NCM specimens were analyzed by a TLC scanner for detection of the dot blot signal intensity. RESULTS: The signals of NOS mRNA, NOS activity, hsp70-IR, NSE-IR, and NO content in the experiment group were higher than those in the control group (P < 0.05-0.01). CONCLUSIONS: 8-Br-cAMP could increase NO product and the expression of NOS mRNA, NOS, NSE and hsp70. The results indicate that 8-Br-cAMP could facilitate synthesis of NO in the neuroblastoma HXO-Rb44 cells, which could have tendency toward neuron development, suggesting that the increased hsp70, NO and NOS may involve cell differentiation of the retinoblastoma HXO-Rb44.

8-Bromo Cyclic Adenosine Monophosphate↗
PubMed2000

Noninvasive three-dimensional computed tomographic angiography in preoperative detection of intracranial arteriovenous malformations.

OBJECTIVE: To assess the value of noninvasive three-dimensional computed tomographic angiography (3D-CTA) in preoperative detection of intracranial arteriovenous malformations (AVMs). METHODS: A prospective evaluation at a single institute over a 2-year period included 23 patients suspected of intracranial AVMs. All patients underwent 3D-CTA and digital subtraction angiography (DSA). Results from both procedures were compared. RESULTS: 3D-CTA imaging provided excellent visualization of intracranial AVMs. The false positive error and false negative error were zero in our sample. The details of arterial supply (numerical measure, orientation, caliber and routing) and vascular nidus (size, morphosis and location) provided by 3D-CTA images were the same as DSA and the details of venous drainage were an approximate match. Additionally, 3D-CTA can depict tridimensional anatomical information for AVMs and their relationship to adjacent structures, a function not possible with DSA. This assisted the surgeons in making better surgical planning and reduced trauma. As a noninvasive course, there were no related-complications in the course of 3D-CTA processing. CONCLUSIONS: DSA is still regarded as the gold standard for intracranial AVMs detection. The modality of 3D-CTA is accurate, noninvasive, nearly risk free and low-price; we could routinely use it instead of or as a supplement to DSA, in the preoperative detection of suspected intracranial AVMs and postoperative radiological follow-up. 3D-CTA adds tridimensional aspect and assists the surgeon in a the more accurate therapeutic scheme. Preliminary data suggest that 3D-CTA is playing a favorable role in the assessment of patients with intracranial AVMs.

Adolescent↗
PubMed2000

Acute fatty liver of pregnancy: diagnosis and management of 8 cases.

OBJECTIVE: To investigate the early recognition and management of acute fatty liver of pregnancy (AFLP) to improve maternal and fetal survival. METHODS: Eight cases of AFLP seen in our hospital during the past three years were studied retrospectively. Symptoms, laboratory findings, timing of liver biopsy, and maternal and fetus outcome were assessed. RESULTS: The mean gestational age at onset was 34 +/- 2 weeks. All cases were primigravida. In the early stages, all patients presented malaise, nausea, vomiting and epigastric distress followed by jaundice in the third trimester of pregnancy. LABORATORY FINDINGS: all had raised transaminases and serum bilirubin (32.5-510.8 mumol/L), hypoalbuminemia (22.4-30.0 g/L), hypofibrinogenemia (< 180 mg/dl), prolonged prothrombin time and prolonged partial thromboplastin time. Maternal complication included hepatic encephalopathy (6 cases), ascites (6), hypoglycemia (5), hematemesis (2), and postpartum hemorrhage (5) and preeclampsia (4). Emergency cesarean section was performed in 3 cases. One mother died of fulminant hepatic failure and the others survived. There was no fetus death. Liver biopsy was done on the 5th to 15th postpartum day in 8 cases. CONCLUSION: With increasing awareness, especially in the early recognition of milder cases, and prompt progressive management including early termination of pregnancy by cesarean section and large dose infusion of fresh frozen plasma and albumin alternately, the prognosis of AFLP can be improved.

Acute Disease↗
PubMed2000

Activated protein C resistance in antiphospholipid thrombosis syndrome.

OBJECTIVE: To explore the correlation between antiphospholipid antibodies (APA), activated protein C resistance (APCR) and antiphospholipid thrombosis (APL-T) syndrome and further investigate the mechanism of thrombosis in APL-T syndrome. METHODS: ELISA, PTT-LA and APTT +/- APC methods were used to detect anticardiolipin antibodies (ACA), lupus anticoagulants (LA) and APC R in 20 APL-T syndrome patients. RESULTS: Twenty patients were diagnosed as APL-T. ACA-IgG, M and LA are strongly associated with APL-T. The incidence of APCR in APL-T (75%) was significantly higher than that of the normal group (5%). CONCLUSION: There was high prevalence of APCR in APL-T, which was strongly associated with LA. It is proposed that acquired APCR induced by APA is a key to understanding thrombosis in Chinese APL-T patients.

Activated Protein C Resistance↗
PubMed2000

Azathioprine and methylprednisolone: prevention of chronic cerebral vasospasm in dogs.

OBJECTIVE: To study the preventive effects of single use of azathioprine and its combination with methylprednisolone on chronic cerebral vasospasm (CVS). METHODS: A canine model of the "double subarachnoid hemorrhage (SAH)" was established to study the angiogram characteristics of chronic CVS. The effects of azathioprine and its combination with methylprednisolone on the prevention of chronic CVS were observed in a randomized study. The content of malondialdehyde (MDA) and pathological changes in the basilar artery (BA) wall were also analyzed. RESULTS: The results were obtained on the 7th day after subcarachnoid hemorrhage. In the azathioprine group, the BA diameter was 87% +/- 26% of the original BA diameter, and the MDA content of BA wall was 0.03 +/- 0.01 nmol/mg tissue. In the azathioprine plus methylprednisolone group, it was 93% +/- 20% (BA diameter) and 0.02 +/- 0.01 nmol/mg tissue (MDA content). In the control group, the BA diameter was 53% +/- 19% and MDA content was 0.11 +/- 0.05 nmol/mg tissue. Pathological examination confirmed the reduction in BA wall damage in the experimental groups. CONCLUSION: Azathioprine has a preventive effect on chronic CVS following SAH. It may suppress the production of free radicals and reduce damage to the BA wall. Combined use of azathioprine with methylprednisolone allows lower dosage and less complication compared with a single agent, and results in a better outcome.

Animals↗
PubMed2000

Expression and significance of urokinase-type plasminogen activator in human gliomas.

OBJECTIVE: To investigate the expression and clinical significance of urokinase type plasminogen activator (uPA) in human gliomas. METHODS: mRNA and protein expressions of uPA were examined by Northern blot hybridization and immunohistochemical method in 43 cases of gliomas and 5 cases of normal brain tissues and their relationship to clinical indexes was comprehensively analyzed. RESULTS: All tissues expressed the 2.5 kb transcript of uPA mRNA. The uPA mRNA level in high-grade gliomas was considerably higher than that in low-grade gliomas and normal brain tissues (P < 0.01). Levels of uPA mRNA expression in tumor tissues with recurrence during 18 postoperative months and a survival period less than 3 years, were significantly higher than counterparts (P < 0.01). uPA mRNA expression was strongly correlated with the microvessel quantity (MVQ) in gliomas (r = 0.56, P < 0.01). uPA protein was mainly distributed in tumor cells and endothelial cells of glioblastomas and anaplastic astrocytomas. CONCLUSION: Expression of uPA is associated with the malignant progression, invasion and angiogenesis of gliomas, and it may play a critical role in the recurrence and prognosis of gliomas.

Adolescent↗
PubMed2000

Continuous long-term albendazole therapy in intraabdominal cystic echinococcosis.

OBJECTIVE: To assess the therapeutic effects of long-term albendazole therapy in intraabdominal cystic echinococcosis. METHODS: Fifteen patients with a total of 45 cysts were treated with albendazole with dosage regimen of 20 mg.kg-1.d-1 for an average of 2.5 years. Repeated CT and ultrasound scannings (US) were performed after the end of therapy. The duration of follow-up was 3.6 years on average. The number, size and morphology of cysts were compared before and after treatment. RESULTS: The hydatid cysts were classified according to location and CT patterns into hepatic simple cysts, hepatic cysts with daughter cysts, hepatic/abdominal cysts and splenic cysts. The hepatic simple cysts responded most favorably to albendazole therapy, with an overall cure rate of 88.7%. The disappearance of cysts was observed in 43.0% of cases (15/35). Sixteen cysts (45.7%) became solidified or calcified, among which 8 cysts were completely calcified, 6 showed egg shell-like calcification of the cystic walls, and 2 showed solidification and calcification of cyst contents. Four patients had large hepatic cysts containing daughter cysts; the daughter cysts all disappeared after treatment, but one patient relapsed with the reappearance of daughter cysts at 4-year follow-up. Two splenic cysts also calcified. Two patients had peritoneal cysts; one calcified and the other one reduced in size. Among 15 patients treated, 9 were cured and 6 were improved. There was no serious toxic reactions with continuous long-term therapy in a small series of patients. CONCLUSIONS: Continuous long-term albendazole treatment of intraabdominal cystic echinococcosis is safe and effective in the treatment of hepatic simple cysts, and some daughter cysts, peritoneal secondary cysts and splenic cysts. No serious toxic reactions were found.

Abdominal Abscess↗
PubMed2000

An investigation of immunocompetence substances in normal gingival and periodontitis tissue.

OBJECTIVE: To investigate the effects of nitric oxide (NO), endothelin (ET), substance P (SP) and calcitonin gene-related peptide (CGRP) immunocompetence substances and their relationship to chronic periodontitis. METHODS: Immunohistochemical aod histochemical staining methods were used to detect the expression of the NO synthase (NOS), ET, SP and CGRP levels in 20 patients with chronic periodontitis and 20 healthy subjects as control. RESULTS: Quantitative analysis by Quantimat 970 showed that NOS and ET in periodontitis tissue increased significantly (P < 0.01), particularly the content of ET in comparison with healthy subjects. The intergroup expression of SP and CGRP showed no remarkable changes. CONCLUSION: Our results demonstrate that the level of NOS and ET were significantly increased in periodontic tissue, which may diminish the blood supply and influence the periodontal tissue causing tissue damage. Our study suggests that immunocompetence substances NO and ET are closely associated with periodontitis and may play an important role in the disease.

Adult↗
PubMed2000

Angiostatin K(1-3) gene for treatment of human gliomas: an experimental study.

OBJECTIVE: To discuss the feasibility of gene therapy of human glioma by antiangiogenesis method. METHODS: Angiostatin K(1-3) cDNA with secretive signal was inserted into the polylinker sites of eukaryotic expression vector pcDNA3 to construct pcDNA-SAK(1-3). The vector was transfected into human SHG44 glioma cells by lipofectamine and the positive clone was screened by G418. The biological characteristics of glioma cells were examined by electronmicroscope and flow cytometry. The activity of angiostatin K(1-3) protein expressed by SHG44 cells was examined by the bovine micrangium endotheliocyte inhibition assay and immunofluorescence assay. When SHG44 cells were implanted into the strata subcutaneum of nude mice, tumor necrosis and micrangium were calculated immunohistochemically and electronmicroscopically for determining their characteristics and validity in gene therapy of human glioma by antiangiogenesis method. RESULTS: The eukaryotic expression vector pcDNA-SAK (1-3) was successfully constructed and transfected into glioma cells. The cells expressed angiostatin K(1-3) protein, and their tumorigenesis and angiogenesis in nude mice were greatly reduced. CONCLUSION: Angiostatin K(1-3) gene is feasible to treat human glioma. This experiment lays a foundation for gene therapy of the other solid tumors by antiangiogenesis method.

Angiostatins↗
PubMed2000

[Tumor infiltrating dendritic cells in relation to prognosis of lung cancer].

OBJECTIVE: To study the degree of infiltration of dendritic cells in lung cancer in relation to prognosis. METHODS: S-100 protein as the marker of tumor-infiltraing dendritic cells (TIDC) was stained immunohistochemically in lung cancer specimens. The degree of infiltration was considered mild and marked according to the criteria reported by Furukawa. The survival rate was obtained by Log-rank test of the data. RESULTS: In 15 of 38 adenocarcinomas, whose TIDC infiltration was marked, the five-year survival rate was 60.0%, while in 23 with mild TIDC infiltration, the five-year survival rate was 21.7% (P < 0.01) Quite similar data were obtained from 44 squamous-cell carcinomas. Significantly higher five-year survival rate (61.1%) was observed in those with marked TIDC than those with mild infiltration (19.2%). CONCLUSION: The degree of TIDC infiltration is positively correlated with the survival rate of lung carcinoma patients.

Dendritic Cells↗