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Biomedical subjects

Yu-ping Wang

Publications and source records attributed to Yu-ping Wang.

12 recordsLinked to original sources
PubMed2006

Diffusion tensor imaging in medial temporal lobe epilepsy.

BACKGROUND: Diffusion tensor imaging (DTI) is a noninvasive imaging technique for the assessment of the integrity of cerebral tissues. This study was undertaken to assess the changes of diffusion indices of hippocampal formation (HF) in patients with medial temporal lobe epilepsy (MTLE). METHODS: Fourteen patients with MTLE and 14 healthy subjects were evaluated. Mean diffusivity (MD) and fractional anisotropy (FA) from the symmetrical-voxel sampling regions of the anterior HF were calculated in all subjects. The MD and FA values were compared across the groups. RESULTS: No significant differences of MD and FA values were noted between right and left HF in the controls. In the patient group, MD significantly increased in the HF ipsilateral to the lesioned side [(9.27 +/- 1.09) x 10(-4) mm(2)/s], compared with the values in the contralateral HF [(8.20 +/- 0.59) x 10(-4) mm(2)/s] (t = 4.479, P = 0.001) and healthy subjects [(7.58 +/- 0.51) x 10(-4) mm(2)/s] (P < 0.001), but no significant differences were found in FA. When compared with the controls, patients had a significantly higher MD in the contralateral HF (P < 0.05), but the difference in FA was not statistically significant. CONCLUSIONS: DTI could detect hippocampal abnormality in patients with MTLE. This technique may be helpful for preoperative evaluation of such patients.

Adolescent↗
PubMed2006

[Ultrastructural features and platelet-derived growth factor receptor A gene mutations in CD117-negative gastrointestinal stromal tumor].

OBJECTIVE: To explore the ultrastructural features and mutation status of platelet-derived growth factor receptors A (PDGFRA) and c-kit in gastrointestinal stromal tumors that were immunohistochemically negative for CD117 antigen. METHODS: Six cases of gastrointestinal stromal tumors that were CD117 immunostain negative were studied by electron microscopy. Direct PCR sequencing was used to investigate the mutation status of c-kit gene exons 9, 11, 13, 17 and PDGFRA gene exons 12 and 18. RESULTS: The ultrastructural features of all 6 cases were similar to those of the interstitial cell of Cajal (ICC). None of the 6 cases were found to have c-kit gene mutations. However, three tumors were found to harbor PDGFRA exon 18 activating mutations, including two tumors having an Asp-->Val842 missense mutation and one having an Arg-->Ser841 missense mutation. CONCLUSIONS: PDGFRA mutations may provide an important alternative molecular mechanism for the development of gastrointestinal stromal tumor.

Adult↗
PubMed2006

[Development of ELISA-kit of quantitative analysis for Zearalenone].

OBJECTIVE: To develope a rapid, sensitive, quantitative ELISA-kit for Zearalenone and determine zearalenone in cereals. METHODS: On the base of monoclonal antibodies against ZEN, apply indirect ELISA to study the performance parameter of the kit. RESULTS: The limited concentration of detection of the ELISA-kit was 1ng/ml, linear range was 1-200 ng/ml, the linear equation was Y = 0.99 - 0.40 x (R2 = 0.99). The inhibition concentration of 50% against ZEN was 16.3 ng/ml. The average recovery rate of spiked corn and wheat was 96.5% and 95.5%, respectively, the coefficient of variant was 13.2% and 10.9%, respectively. The kit can be stored at 4 degrees C over 6 months. The cross reaction rate with the other mycotoxins was less than 1%, and coefficient of variant within-laboratory and between-laboratory was less than 15% and less than 20%, respectively. Detecting the VICAM sample with ELISA method and HPLC method, the results were within the range of the sample, and there was no statistic difference between the two methods. CONCLUSION: This ELISA-kit was quick, sensitive, stable and specific and can be used to determine ZEN in cereals.

Edible Grain↗
PubMed2006

[Correlation between desmin gene, platelet-activating factor acetylhydrolase gene and dilated cardiomyopathy].

OBJECTIVE: To test the Missense mutation of Desmin gene (Ile451Met), the frequency of missense mutation (G994-->T) of Platelet-Activating Factor Acetylhydrolase (PAF-AH) gene, and the correlation between these mutations and dilated cardiomyopathy (DCM) in the Chinese population with DCM. METHODS: A case control study was conducted with 89 DCM patients and 110 healthy people (control group) participating in the study. The exon 8 of Desmin gene and exon 9 of PAF-AH gene were identified by polymerase chain reaction, restriction enzyme digestion, polyacrylamide gel electrophoresis and DNA sequencing for described mutation site of Desmin (Ile451Met) and PAF-AH (Val279Phe). RESULTS: No mutation (Ile451Met) in Desmin gene was found in either the DCM patients or the healthy people. There was no significant difference in the frequency of PAF-AH gene mutation (Val279Phe) between the patient and control groups (P>0.05). CONCLUSION: Neither the mutation of Ile451Met in gene encoding for Desmin exon 8 nor the mutation frequency of PAF-AH gene (G994-->T) has correlation with the DCM.

1-Alkyl-2-acetylglycerophosphocholine Esterase↗
PubMed2005

Molecular detection of EWS-Ets fusion transcripts and their clinicopathologic significance in Ewing's sarcoma/peripheral primitive neuroectodermal tumor.

BACKGROUND: Ewing's sarcoma/peripheral primitive neuroectodermal tumor (ES/pPNET) is often difficult to distinguish from other small round cell tumors. The EWS-Ets gene fusions that result from chromosomal translocations in this tumor provide potential molecular diagnostic markers. To apply these molecular markers to commonly available archival materials, we evaluated the feasibility of detecting EWS-Ets including EWS-Fli1 and EWS-ERG fusion transcripts in paraffin-embedded tissues and its diagnostic value for detecting ES/pPNET. METHODS: Thirteen paraffin-embedded samples of ES/pPNETs were retrieved from archives. Thirteen cases of other tumors with small round cell features (including rhabdomyosarcoma, neuroblastoma, lymphoma, small cell carcinoma, and desmoplastic small round cell tumor) were used as negative controls. Beta-actin and beta2-microglobulin were used as internal controls. A nested reverse transcriptase-polymerase chain reaction (RT-PCR)-based assay was performed to detect the EWS-Fli1 and EWS-ERG fusion transcripts. RESULTS: Beta-actin and beta2-microglobulin were detected in 10/13 and 13/13 ES/pPNETs, respectively. EWS-Fli1 fusion transcripts were detected in 11 of 13 (85%) ES/pPNETs. Three chimeric transcripts, all EWS-Fli1, were detected in ES/pPNET samples. Among 11 EWS-Fli1-positive cases, 7 cases had a type I fusion transcript involving fusion of EWS exon 7 with Fli1 exon 6, 2 cases had a type II fusion transcript involving EWS exon 7 with Fli1 exon 5, and 2 cases expressed fusion transcripts involving EWS exon 7 and Fli1 exon 8. Type I EWS-Fli1 fusion predominated over other types. Fusion types could not be distinguished in the remaining 2 cases. Thirteen negative controls did not show detectable chimeric messages. There was a significant relationship between EWS-Fli1 fusion transcripts and CD99 expression. CONCLUSIONS: Molecular detection of EWS-Fli1 fusion transcripts in formalin-fixed paraffin-embedded material by nested RT-PCR is feasible and is useful for the diagnosis and differential diagnosis of ES/pPNETs.

Adolescent↗
PubMed2005

[Detection of EWS-WT1 fusion transcripts in paraffin-embedded tissues for desmoplastic small round cell tumor].

OBJECTIVE: To detect the EWS-WT1 chimeric mRNA in desmoplastic small round cell tumor (DSRCT) and its clinicopathological significance. METHODS: Formalin fixed, paraffin-embedded tumor specimens from 4 examples of this entity were studied by reverse transcriptase polymerase chain reaction to detect the EWS-WT1 fusion transcripts resulting from the chromosomal translocation t(11;22)(p13;q12). The following tumor specimens were included as controls: 2 Ewing's sarcomas/primitive neuroectodermal tumors (PNET/ES), 2 alveolar rhabdomyosarcomas, and 2 lymphomas. RESULTS: EWS-WT1 fusion transcripts were detected in 3 of 4 desmoplastic small round cell tumors but not in any other tumor types studied as controls. CONCLUSION: The analysis of the EWS-WT1 fusion transcript which was performed on formalin-fixed, paraffin-embedded tissues is a sensitive and specific method in the diagnosis and differential diagnosis of DSRCT.

Abdominal Neoplasms↗
PubMed2005

[Monoclonal antibodies against human tumor metastasis suppressor gene-1 TMSG-1: preparation, characterization and application].

OBJECTIVE: In order to clarify the exact molecular weight of tumor metastasis suppressor gene-1 (TMSG-1) protein and its cellular localization, a monoclonal antibody against TMSG-1 was prepared, characterized and applied to evaluate the metastatic potential of human tumors. METHODS: A dominant epitope-TMSG-1(15)-derived from TMSG-1 was synthesized based on Fmoc method, and the hapten was conjugated to Imject Maleimide activated mcKLH as a carrier protein. The antigen preparation was used to immunize BAL B/C mice. Hybridomas were generated and screened by ELISA for specific monoclonal antibodies, which were further characterized by western blotting and immunohistochemical staining. RESULTS: One hybridoma cell line secreting anti-TMSG-1 antibody, designated as C8, was eventually established after primary ELISA screening, followed by rapid limited dilution procedure. It was confirmed that C8 was of IgM isotype. Result of competitive inhibition assay showed that the antibody was TMSG-1 specific. Using this antibody, an expected protein band of about 45,000 (relative molecular mass) was detected in the non-metastatic variants PC(3)-2B4 and PG-LH7 cells by Western blotting, but not in the isogenetic metastatic variants of PC3-1E8 and PG-BE1 cells. Immunohistochemistry using C8 showed a positive staining of cell membrane and cytoplasm of 2B4 and LH7 cells, whereas 1E8 and BE1 cells were non-reactive. Immunostaining using C8 of paraffin sections of 52 breast carcinomas and 41 colon cancers demonstrated a strong positivity in non-metastatic tumors, but none to weakly reactive in metastatic tumors (P < 0.05). CONCLUSION: C8 monoclonal antibody against the synthetic peptide is TMSG-1 specific and is effective for Western blot and immunohistochemistry assays to detect TMSG-1 expression in cancer cells. TMSG-1 protein is about 45 000 (relative molecular mass) at cell membrane and cytoplasm of tumor cells. Expression of TMSG-1 protein correlates well, inversely with the tumor metastatic potential.

Animals↗
PubMed2005

[Effects of acupuncture on diabetic peripheral neuropathies].

OBJECTIVE: To observe therapeutic effect of acupuncture on diabetic peripheral neuropathy (DPN) and explore the mechanism. METHODS: Sixty-eight cases of DPN were treated with acupuncture at Jianyu (LI 15), Quchi (LI 11), Waiguan (TE 5) etc. and their blood sugar, blood lipids and hemorrheologic indexes and nerve conductive velocity before and after treatment were determined. RESULTS: After treatment, 43 cases were markedly effective, 20 cases were effective and 5 cases were ineffective, with a total effective rate of 92.6%; the nerve conductive velocity, plasma insulin, C-peptide, opioid peptides increased significantly (P<0.01) and blood viscosity significantly decreased (P<0.01). CONCLUSION: Acupuncture has a definite therapeutic effect on DPN and the increase of nerve conductive velocity is possibly related with the increase of plasma opioid peptides.

Acupuncture Therapy↗
PubMed2005

[Lung pathology and pathogenesis of severe acute respiratory syndrome: a report of six full autopsies].

OBJECTIVE: Severe acute respiratory syndrome (SARS) is an emerging infectious disease that first manifested in humans in November 2002. The SARS-associated coronavirus (SARS-CoV) has been identified as the causal agent, but the pathology and pathogenesis are still not quite clear. METHODS: Post-mortem lung samples from six patients who died from SARS from April to July 2003 were studied by light and electron microscopy, Masson trichromal staining and immunohistochemistry. Evidence of infection with the SARS-CoV was determined by reverse-transcription PCR (RT-PCR) , serological examination and electron microscopy. RESULTS: Four of six patients had serological and RT-PCR evidence of recent infection of SARS-CoV. Morphologic changes are summarized as follows: (1) Diffuse and bilateral lung consolidation was seen in all patients (6/6) with increasing lung weight. (2) Diffuse alveolar damage was universal (6/6) with hyaline membrane formation (6/6), intra-alveolar edema/hemorrhage (6/6), fibrin deposition (6/6), pneumocyte desquamation (6/6). A marked disruption in the integrity of the alveolar epithelium was confirmed by immunostaining for the epithelial marker AE1/AE3 (6/6). (3) Type II pneumocytes, with mild hyperplasia, atypia, cytomegaly with granular amphophilic cytoplasm and intracytoplasmic lipid accumulation (5/6). (4) Giant cells in the alveoli were seen in five of 6 patients (5/6) , most of which were positive for the epithelial marker AE1/AE3 (5/6), but some cells were positive for the macrophage marker CD68(2/6). (5) A pronounced increase of macrophages were seen in the alveoli and the interstitium of the lung (6/6), which was confirmed by histological study and immunohistochemistry. (6) Haemophagocytosis was present in five of the 6 patients(5/6). (7) Lung fibrosis was seen in five patients(5/6), with alveolar septa and interstitium thickening(5/6), intraalveolar organizing exudates (6/6) and pleura thickening (4/6). Proliferation of collagen was confirmed by Masson trichromal staining, most of which was type III collagen by immunostaining. The formation of distinctive fibroblast/myofibroblast foci was seen in five patients (5/6) by light microscopy and immunochemistry. (8) Squamous metaplasia of bronchial mucosa was seen in five patients(5/6). (9) Thrombi was seen in all patients(6/6). (10) Accompanying infection was present in two patients, one was bacteria, the other was fungus. In addition, electron microscopy revealed viral particles in the cytoplasm of alveolar epithelial cells and endothelial cells corresponding to coronavirus. CONCLUSION: Direct injury of SARS-CoV on alveolar epithelium, prominent macrophage infiltration and distinctive fibroblast/myofibroblast proliferation may play major roles in the pathogenesis of SARS.

Adult↗
PubMed2004

[Study on association between aldosterone synthase gene polymorphism and the left ventricular structure and function of patients with dilated cardiomyopathy in China].

OBJECTIVE: To investigate the association between a -344 C/T polymorphism of aldosterone synthase gene (CYP11B2) and the left ventricular structure and function of patients with dilated cardiomyopathy (DCM) in China. METHODS: Eighty-nine patients with DCM were genotyped by PCR-RFLP, and were divided into TT, TC, CC and TT+CC four groups by their genotypes, respectively. Left ventricular structure and function were assessed with echocardiography. RESULTS: There was no significant difference between four groups in left ventricular diameters, mass and ejection fraction in patients with DCM. CONCLUSION: The data were not in favor of a significant association between the aldosterone synthase gene CYP11B2 and the left ventricular structure and function in patients with DCM.

Adult↗
PubMed2003

[Expression of telomerase and telomerase associated-regulation protein and proliferating cell nuclear antigen in ovarian epithelial tumors].

OBJECTIVE: To investigate expression and significance of hTERT, telomerase associated-regulation protein (TRAP) and proliferating cell nuclear antigen (PCNA) in ovarian epithelial tumors. METHODS: 106 specimens of ovarian epithelial tumors and their clinical history were collected, including 54 cases of malignancy, 33 borderline cases and 19 benign tumor cases. Immunohistochemical staining for hTERT, TRAP and PCNA were performed. Follow-up information was obtained for 45 of 87 cases (malignancy in 54 and borderline malignancy in 33). RESULTS: The expression of hTERT was significantly different between benign (4/19) and borderline (90.9%, 30/33) cases, benign and malignant (94.4%, 51/54) cases (P < 0.001), as was the expression of TRAP between benign (4/15) and malignant (77.8%, 28/36) cases (P < 0.001). The expression of hTERT and TRAP was not higher in stage III, IV ovarian cancer patients than in stage I and II (P > 0.05, P > 0.3). The expression of PCNA between benign (6.9 +/- 5.9)% and borderline (26.4 +/- 17.8)% cases, benign and malignant (51.8 +/- 22.1)% cases, and borderline and malignant cases were different, and were statistically significant (P < 0.01, P < 0.001, P < 0.05). 33 cases of borderline malignancy are all survive. In 54 cases of malignancy, 35 of them have metastasis (64.8%), including 5 cases of lymph nodes metastasis. 4 of them died (7.4%). CONCLUSIONS: The expression of hTERT and TRAP is associated with the malignant degree of ovarian cancer, but does not correlate with stage. The expression of TRAP resembles hTERT, which may be a new tumor-associated gene. Telomerase activity is positively associated with PCNA.

DNA-Binding Proteins↗