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Biomedical subjects

Jing Chen

Publications and source records attributed to Jing Chen.

At least 109 records · Page 6Linked to original sources
PubMed2006

[18FDG PET cerebral function imaging in 10 vascular dementia patients receiving needling at Baihui(DU20), Shuigou(DU26) and Shenmen(HT7)].

OBJECTIVE: To observe the effect of needling at Baihui(DU20), Shuigou(DU26) and Shenmen(HT7) on glucose metabolism in different regions of the brain in vascular dementia patients. METHODS: Ten patients with vascular dementia were randomized into 2 groups, and the patients in the control group received the treatment with needling in the routine acupoints for hemiplegia (chosen from 6 Yang meridians of the hand and foot), while those in treatment group received needling at 3 additional acupoints, namely Baihui(DU20), Shuigou(DU26) and Shenmen(HT7), which were specific for dementia treatment. All the patients were examined by positron-emission tomography(PET) to detect the glucose metabolism in different brain regions before and after acupuncture treatment by means of semiquantitative analysis of the average values of radioactive count in the brain regions. RESULTS: Needling at the additional 3 acupoints could obviously enhance glucose metabolism in the bilateral frontal lobes, bilateral thalamus, temporal lobe and lentiform nucleus on the uncompromised side. CONCLUSION: The effect of needling at Baihui(DU20), Shuigou(DU26) and Shenmen(HT7) on vascular dementia is closely related to improved cerebral glucose metabolism.

Acupuncture Points↗
PubMed2006

[Female urogenital mycoplasma infection and drug sensitivity status in Changsha].

OBJECTIVE: To survey mycoplasma infection in female urogenital tract and analyze the drug sensitivity of mycoplasma in Changsha. METHODS: Ureaplasma urealyticum (Uu) and Mycoplasma hominis (Mh) were detected in 6566 cases of female urogenital tract infection by means of mycoplasma culture and drug sensitivity reagent kit. Sensitivity tests for 10 antibiotics were also performed. RESULTS: A total of 2938 cases were mycoplasma-positive (positivity rate of 44.75%), including 2469 Uu-positive cases (37.6%), 52 Mh-positive cases (0.08%) and 417 cases positive for both Uu and Mh (6.35%). Josamycin, doxycycline, clarithromycin and azithromycin were more effective against Uu infection. Josamycin, doxycycline and thiamphenicol were more effective against Mh infection. Mixed infection with Uu and Mh was more resistant to most antibiotics but Josamycin and doxycycline. CONCLUSION: The female urogenital mycoplasma infection results mainly from Uu. Compared with simple Uu or Mh infection, mixed infection with Uu and Mh has significantly greater resistance to a wider variety of drugs. Josamycin and doxycycline are the primary choice for female urogenital mycoplasma infection in Changsha.

Adolescent↗
PubMed2006

[Effect of electro-scalp acupuncture on cerebral dopamine transporter in the striatum area of the patient of Parkinson's disease by means of single photon emission computer tomography].

OBJECTIVE: To probe the mechanism of electro-scalp acupuncture in treatment of Parkinson's disease (PD) by single photon emission computer tomography (SPECT). METHODS: Five cases of PD received electro-scalp acupuncture at Dingnie Qianxiexian (MS 6), Epangxian III (MS 4), Dingpangxian I (MS 8), Dingpangxian II (MS 9) and Zhenxia Pangxian (MS 14). Contralateral points were selected for pathologic change on one side and bilateral points were selected for pathologic lesion on both sides. All the patients received 99mTc-TRODAT-1 SPECT examination before and after acupuncture treatment of 6 weeks. And activities of dopamine transporter (DAT) were analyzed by the ratio of striatum/occipital lobe (ST/OC), which was evaluated by means of technique of regional of interesting (ROI). RESULTS: The ratio of ST/OC on the same side of the affected extremity before and after treatment were 1.19 +/- 0.15 and 1.24 +/- 0.31 respectively. And on the other side were 0.90 +/- 0.12 and 0.95 +/- 0.25 respectively. They were increased after treatment (P > 0.05). CONCLUSION: Electro-scalp acupuncture can decrease the loss of DAT and improve the activities of DAT in the striatum of the patient of PD.

Aged↗
PubMed2006

[Determination of bitter components in citrus juice by high performance liquid chromatography].

Bitterness in citrus juice is primarily due to the presence of both limonin and naringin, and determination of them is a standard in controlling the quality of juice. A high performance liquid chromatographic (HPLC) method was developed for the rapid determination of bitter components in citrus juice. The HPLC conditions were as follows: ODS column with acetonitrile-tetrahydrofuran-water (17.5: 17.5: 65, v/v) as mobile phase, flow rate at 1 mL/min, 207 nm as detection wavelength for limonin, and methanol-100% acetic acid-water (40:1:59, v/v) as mobile phase, flow rate at 1 mL/min, 283 nm as detection wavelength for naringin. As results showed, for limonin and naringin, the linearity was good within the ranges of 1.00 - 50.00 mg/L (r = 0.9992) and 20.00 - 160.00 mg/L (r = 0.9988) respectively, and the detection limits were 0.07 microg and 0.14 microg, then the average recoveries were 98.69% and 100.13% with relative standard deviations of 2.5% and 1.5%, respectively. The method is simple, rapid and accurate for determining limonin and naringin in juice.

English Abstract↗
PubMed2006

[Correlation between karyotypic characteristics and treatment outcome in childhood acute lymphoblastic leukemia].

OBJECTIVE: To analyze the relationship between karyotypic characteristics and treatment outcome of childhood acute lymphoblastic leukemia (ALL) and compare the difference in karyotypic aberration between ALL patients in China and in western countries. METHODS: From January 1998 to May 2003, 193 patients with newly diagnosed ALL were enrolled on protocol ALL-XH-99. The patients were classified into 4 groups according to the karyotype of the leukemia cells: normal karyotype, hypodiploid, hyperdiploid and pseudodiploid. Event-free survival (EFS) was estimated by Kaplan-Meier analysis and the distributions of EFS were compared using the log-rank test. A Cox proportional hazards model was used to identify independent prognostic factors. RESULTS: (1) Of 193 ALL patients, 115 had cytogenetic data. There were 53 (46.09%) with normal karyotype, 29 (25.22%) hyperdiploid, 9 (7.83%) hypodiploid, 4 coexpression of hypodiploid/hyperdiploid and 20 (17.39%) pseudodiploid. The probability of 5-year EFS for the four subgroups were (78.28 +/- 6.34)%, (86.07 +/- 6.47)%, (53.85 +/- 13.83)% and (40.10 +/- 12.17)%, respectively (P = 0.0041). (2) The clinical presentation and early response to treatment had no difference among the four groups, but the events are significantly different. (3) The probability of 5-year EFS for the combined hypodiploid group and the non-hypodiploid group was (53.85 +/- 13.83)% and (69.98 +/- 5.94)%, respectively (P = 0.1281). (4) The probability of 4-year EFS was significantly worse for patients with Philadelphia chromosome than for no Philadelphia chromosome patients [(28.57 +/- 17.07)% vs (70.85 +/- 5.60)%, P = 0.0009]. (5) Multivariate analysis suggested that the karyotypic characteristics, Philadelphia chromosome, age < 1-year or > 12-year, and white blood cell counts were independent prognostic factors. CONCLUSIONS: The cytogenetic pattern of Chinese childhood ALL patients was similar to that of western countries. Cytogenetic findings especially Philadelphia chromosome had important prognostic significance.

Adolescent↗
PubMed2006

[Determination of 16 PAHs from atmospheric particulate matter PM2.5 in certain ironworks district by HPLC].

The paper describes the determination of the 16 polycyclic aromatic hydrocarbons (PAHs) prescribed by Environmental Protection Agency in PM2.5 in certain ironworks district of Beijing by HPLC. A HPLC method of VWD-FLD connected in series was founded. The 16 PAHs were completely separated by the method. The earlier eluted ten PAHs were detected by VWD and the rest were detected by FLD. The minimum detection limits of the 16 PAHs vary from 0.29 microg x L(-1) (for Bkf) to 50.6microg x L(-1) (for Nap), the average recoveries range between 85.1% (for Nap) and 103.2% (for Fla) and the relative standard deviations are between 4.31% (for Flu) and 9.93% (for Ind). The detection results indicate that the pollution situation is still very serious in this district.

Air Pollutants↗
PubMed2006

[Asparagine synthetase activity in pediatric acute lymphoblastic leukemia].

OBJECTIVE: To study the cellular activity of asparagine synthetase in different types of childhood acute lymphoblastic leukemia (ALL). METHODS: The cellular activity of asparagine synthetase was detected by HPLC-FLD and Protein measurement in 28 ALL children (7 cases of T-ALL and 21 cases of B-lymphoid lineage ALL) before chemotherapy. RESULTS: The asparagines synthetase activity levels in T-ALL children were significantly higher than those of the B-lymphoid lineage ALL patients, with the median activity level of 9.3 nM Asn/mg protein/hr vs 5.2 nM Asn/mg protein/hr (P < 0.05). The distribution of the asparagine synthetase activity demonstrated a polymorphism in either T-ALL or B-lymphoid lineage ALL patients. CONCLUSIONS: The cellular activity of asparagines synthetase in ALL patients is presented with a polymorphism distribution. The asparagines synthetase activity levels in T-ALL are significantly higher than in B-lymphoid lineage ALL.

Asparaginase↗
PubMed2006

[Development and equivalence evaluation of spondee lists of mandarin speech test materials].

OBJECTIVE: To edit the spondee (disyllable) word lists as a part of mandarin speech test materials (MSTM). These will be basic speech materials for routine tests in clinics and laboratories. METHODS: Two groups of professionals (audiologists, Chinese and Mandarin scientists, linguistician and statistician) were set up at first. The editing principles were established after 3 round table meetings. Ten spondee lists, each with 50 words, were edited and recorded into cassettes. All lists were phonemically balanced (3-dimensions: vowels, consonants and Chinese tones). Seventy-three normal hearing college students were tested. The speech was presented by earphone monaurally. Three statistic methods were used for equivalent analysis. RESULTS: Related analysis showed that all lists were much related, except List 5. Cluster analysis showed that all ten lists could be classified as two groups. But Kappa test showed that the lists' homogeneity were not well. CONCLUSIONS: Spondee lists are one of the most routine speech test materials. Their editing, recording and equivalent evaluation are affected by many factors. This also needs multi-discipline cooperation. All lists edited in present study need future modification in recording and testing in order to be used clinically and in research. The phonemic balance should be kept.

Adult↗
PubMed2006

[Expression and significance of X-linked inhibitor of apoptosis protein and its antagonized proteins in acute leukemia].

To investigate the expression and significance of X-linked inhibitor of apoptosis protein (XIAP) and XIAP-associated factor 1 (XAF1) in acute leukemia, the expression of XIAP, XAF1, Smac, and HtrA2 mRNA in the bone marrow aspirates from 87 newly diagnosed AL patients, 23 patients in remission, 6 patients in relapse, and 17 normal controls were detected by means of reverse transcriptase polymerase chain reaction (RT-PCR), and their relationship with clinical therapeutic efficiency was analyzed. The results showed that the expression level of XIAP mRNA in newly diagnosed AL patients (0.990 +/- 0.337) was significantly higher than that in normal controls (0.395 +/- 0.148) (P < 0.01); the positive rate and expression level of XAF1 mRNA in newly diagnosed AL patients (56.32%, 0.246 +/- 0.267) were significantly lower than that in normal controls (100%, 0.964 +/- 0.387) (P < 0.01). In 69 out of 87 newly diagnosed AL patients, efficacy remained evaluable. AL patients with high level of XIAP achieved a lower complete remission (CR) rate than patients with low level of XIAP (54.55% and 86.11%, respectively) (P < 0.01). XAF1 positive patients achieved a higher CR rate than XAF1 negative patients (86.84% and 51.61%, respectively) (P < 0.01). It is concluded that the overexpression of XIAP and negativity of XAF1 may be two adverse prognostic factors in AL patients.

Acute Disease↗
PubMed2006

[Equivalence analysis of disyllabic Mandarin speech test materials].

OBJECTIVE: To evaluate the equivalence of difficulty of disyllabic Mandarin Speech Test Materials (MSTM) in order to facilitate wider use of speech audiometry in Chinese audiology clinics. METHOD: The Mandarin disyllabic materials, including 10 lists with 50 words in each, have been recorded and converted digitally into CD format. Sixty-five subjects (the age-range 18-25 years) with normal hearing who speak Mandarin well in their daily lives participated in this study. Five of them joined the pilot study, which aimed to identify a presentation level which would be used into the formal test. The other sixty subjects participated in the formal speech perception test. The results were analyzed statistically with Statistical Package for the Social Sciences Software Version 11.0 (SPSS 11.0). RESULT: Nine of the 10 lists were found to have equal difficulty with application of the ANOVA and SNK-Q statistical methods. CONCLUSION: Nine lists of 50 words of these Mandarin disyllabic materials can be considered to have equal difficulty and could be used in a clinical setting.

Adolescent↗
PubMed2006

[An experimental research on the combination treatment of sFLK-1 gene therapy combined with gamma knife].

OBJECTIVE: To evaluate whether the sustained expression by adenovirus-mediated gene (sFLK-1) transfer can enhance the treatment efficacy of gamma knife radiosurgery. METHODS: The mouse sFLK-1 gene was cloned to construct the recombinant adenovirus. The gliomata growing in BALB/c female nude mice with an initial mean volume of (109.3 +/- 20.5) mm3 were treated with gamma knife alone (13 Gy on day 12), sFLK-1 adenovirus alone (1 x 10(9) plaque-forming units, PFU was given to two mouse tail vein by injections, 7 and 14 days), gamma knife associated with sFLK-1 adenovirus or control adenovirus (1 x 10(9) PFU was given to two mouse tail vein by injections, 13 and 17 days). After the completion of therapy, the tumor size was recorded. The microvessel density (MVD) and tumor apoptosis were evaluated by immunohistochemical means. RESULTS: As comparing with three other control groups, the combination treatment group with sFLK-1 gene therapy and gamma knife not only significantly reduced tumor volume and prolonged the life span of tumor burden mice as well. In addition, the average tumor weights were lower in sFLK-1 combined with gamma knife group than in any other control group. Immunohistochemical analysis of glioma demonstrated a decreased MVD and a high apoptosis cell rate in sFLK-1 combined with gamma knif group. CONCLUSION: The antitumor effect of gamma knife can be potentiated by sFLK-1 gene therapy. Thus the combination of sFLK-1 gene therapy and gamma knife results an additive effect of antitumor. The observation may provide an important strategy for treatment cancer metastasis.

Adenoviridae↗
PubMed2006

[Neurogenesis of hippocampus following pentylenetrazol-induced status epilepticus in developing rats and the effect of MK-801 on neurogenesis].

OBJECTIVE: This study aimed to determine whether pentylenetetrazol-induced status epilepticus (SE) can induce dentate granule cell neurogenesis in the developing rat and the effect of MK-801, a noncompetitive antagonism of N-methyl-D-aspartate receptor (NMDAR), on neurogenesis. METHODS: Two hundred and sixteen postnatal days 7, 14, 21 or 28 Sprague Dawley (SD) rats were involved in this study. Each age group consisted of 54 rats which were randomly assigned into a SE group, a SE + MK-801 group and a Normal control group (n=18 each). SE was induced by intraperitoneal injection of PTZ (80 mg/kg). The SE + MK-801 group was injected intraperitoneally with MK-801 (1 mg/kg) at 1 hr after SE episode. All rats were given 5-bromodeoxyuridene (BrdU) intraperitonealy to label newborn cells at 6, 13 and 27 days after seizures and then were sacrificed 24 hrs after BrdU injection. The immunohistochemistry method was used to measure the expression of BrdU, TuJl (betaIII tubulin), and glial fibrillary acidic protein (GFAP) in the dentate gyrus of hippocampus of rats. RESULTS: The number of the BrdU positive cells in the SE group was significantly higher than in the age-matched normal controls at 7 and 14 days after SE episode (P <0.05 or 0.01). Approximately 82.5% and 80.3% of BrdU-labeled cells in the SE and the Control groups were co-expressed TuJ1 respectively. MK-801 treatment decreased the BrdU positive cells compared with the SE group at 7 and 14 days after SE seizures (P < 0.01). On the 28th day after SE episode there were no differences among the three groups for the BrdU positive cells. CONCLUSIONS: PTZ-induced SE can increase the dentate granule cell neurogenesis in the developing rat. NMDAR plays an important role in neurogenesis following seizures.

Animals↗
PubMed2006

[The expression and clinical significance of survivin gene in leukemia].

OBJECTIVE: To investigate the expression of survivin in leukemia and the prognostic significance in acute leukemia (AL). METHODS: The expression of survivin mRNA was measured in 105 AL and 21 chronic myelogenous leukemia (CML) patients with semi-quantity reverse transcription (RT)-PCR. 15 adults were tested as normal control (NC) and K562, NB4, Kg-1alpha, HL-60 cell lines were also tested as positive control. The cell cycle distribution in AL was measured with flow cytometry (FCM) to analyze the relationship between the level of survivin and cell proliferation. RESULTS: The expression of survivin in de novo AL (0.525 +/- 0.460) was higher than that in NC (0.101 +/- 0.187), while it decreased in complete remission (CR) patients (0.280 +/- 0.095). In replased patients (0.935 +/- 0.343), the expression of survivin increased again. There was no difference of the expression between chronic phase of CML (0.279 +/- 0.112) and NC, but in acute phase of CML (0.653 +/- 0.236), the expression was higher than that in NC. The cases with higher level of survivin had significantly higher proliferation indices (mean PI 9.682) than those (mean PI 6.899). In AL patients, the CR rate of survivin positive cases was lower than that of survivin negative cases. CONCLUSIONS: The PI in survivin positive patients was significantly higher than that in survivin negative indicating its impact on proliferation and cleavage. Abnormal expression of survivin genes was related to pathogenesis and progression of AL and it can serve as a marker of relapse and poor prognosis in AL. Overexpression of survivin is a risk factor for CML.

Case-Control Studies↗
PubMed2006

Numerical simulation of PAHs sorption/desorption on soil with the influence of Tween80.

In this paper, the influences of inionic surfactant Tween80 on polycyclic aromatic hydrocarbons (PAHs) sorption/desorption on artificially contaminated soil were studied, and gamma model was applied to simulate the influences. Results showed that, with the use of Tween 80, the sorption behaviors of PAHs on soil altered significantly. Adsorbed Tween 80 increased the sorption amount of PAHs while the dissolved Tween80 increased the apparent solubility of PAHs. These two processes exert influences on the sorption coefficient of PAHs in soil-water system, which can be depicted by apparent sorption coefficient. The partition coefficients (the soil/water partition coefficient of PAHs and surfactants obtained from sorption experiments) and statistical parameters used in the amended gamma model were obtained in independent experiments. With these parameters, the gamma model could provide a satisfactory independent prediction of PAHs release from soil to aqueous phase at two surfactant concentrations.

Adsorption↗
PubMed2006

[Expression of vascular permeability factor in human vocal cord polyps].

OBJECTIVE: This study aimed to analyse the expression of vascular permeability factor (VPF) in human vocal fold polyps. Meanwhile, we studied the pathogenesis of vocal cord polyp further. METHOD: The expression of VPF were detected with immunohistochemical staining in the 37 cases with vocal cord polyps and 11 healthy vocal folds tissues (SP method). Meanwhile,the positive results were contrasted. RESULT: The percent of positive expression of VPF was 51.35 in vocal cord polyps. This expression tended not to be increased greatly compared with the percent of positive expression of VPF (18.18%) in healthy vocal fold (P > 0.05). But,the percent of positive vascular counts of VPF in the vocal cord polyps (56.66 +/- 25.48) %was higher than that in the healthy vocal fold tissues (37.11 +/- 29.52)% (P < 0.05). In the vocal cord polyps , there was no significant difference in the expression of VPF between the male and female( P > 0.05). CONCLUSION: The VPF may play a key role in the formation of heavy edema of vocal cord polyps. The VPF may be involved in the formation and development of vocal cord polyps . If we can control the produce of VPF in the vocal cord polyps, we may find a new way to treat it.

Adult↗
PubMed2006

[Influence of substance P on the proliferation and apoptosis of fibroblasts of pathological scars].

OBJECTIVE: To further explore the effects of substance P on the proliferation and apoptosis of fibroblasts obtained from pathological scars in vitro. METHODS: Fibroblasts from keloid (KSF) , hypertrophic scar (HSF) and normal dermis (NDF) of 12 burn patients were cultured in vitro and divided into control, SP (with 1 x 10 (-6) mol/L SP added to the culture medium) , and SP + spantide( with 1 x 10 (-6) mol/L SP and 3 x 10 (-5) mol/L spantide added to the culture medium) groups. MTT method or flow cytometry assay was used for the determination of the proliferative activities or apoptotic rate of fibroblasts obtained from KSF, HSF and NDF with SP or Spantide. And then the fibroblasts in SP group were subdivided into 1 x 10( -9) -1 x 10 (-5) mol/L groups to examine the time-or dose-effect of SP to fibroblasts from different sources. RESULTS: In control group, different types of fibroblasts exhibited similar proliferative activities and apoptotic rates. But there was significant difference in these indices between control and SP group (the proliferative activity of KSF, HSF, NDF was 0. 656+/-0. 071, 0. 525 +/-0. 064, 0. 404+/-0. 063, respectively; and the apoptotic rate of KSF, HSF, NDF was [( 1.5+/-0.3) % , (4.0+/-0.5) % , (5.5+/-0.7) % , respectively],( P < 0. 05). SP had stronger effect on KSF than it did to HSF, as well as it had stronger effect on HSF than it did to NDF. In SP + spantide group, the effect of SP on KSF was partially inhibited, while it was completely inhibited in cultures of HSF and NDF. KSF was more sensitive to SP and the effect was longer when compared with HSF. CONCLUSION: SP may play an important role in the process of pathological scar formation due to its diverse effects on fibroblasts from different sources.

Adolescent↗
PubMed2006

[Effect of puerarin on ADMA-DDAH system in human umbilical vein endothelial cells cultured with oxidized free radical].

OBJECTIVE: To observe the effects of puerarin on activity of dimethylarginine dimethylaminohydrolase (DDAH) in human umbilical vein endothelial cells (HUVECs) cultured with oxidized free radical (OFR), to explore the effect of puerarin on metabolic mechanism of asymmetric dimethylarginine (ADMA). METHODS: HUVECs of the 3rd - 6th passage cultured with modified Jaffe's method were divided into 4 groups, the blank control group cultured with DMEM medium, the OFR group cultured with DMEM medium containing 0.1 mmol of OFR per liter, the puerarin group 1 and 2 cultured with DMEM medium containing 0.1 mmol of OFR per liter as well as 0.5 mg/ml and 1.0 mg/ml of puerarin respectively. After being incubated for 24 h, activity of nitric oxide synthase (NOS), contents of nitric oxide (NO), ADMA, endothelin (ET), and L-citrulline (L-cit) in the supernate were measured, and DDAH protein expression in the lysate was detected by Western blotting. RESULTS: Compared with those in the blank control group, ADMA and ET contents were higher, while the levels of NO and L-cit and the activity of NOS were lower markedly, but the DDAH expression changed insignificantly in the OFR group. These abnormalities were restored significantly in the puerarin groups. CONCLUSION: The increase of ADMA in OFR injured HUVECs was correlated with the reduction of DDAH activity and irrelevant to DDAH expression. Puerarin could promote ADMA metabolism through increasing DDAH activity, and improve NOS activity, thus to reduce the impairing of OFR on endothelial function.

Amidohydrolases↗