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Articles by Z Zhu
Total Records ( 4 ) for Z Zhu
  Z Zhu , Y Yan , Q Wang , J Qian and J. Ge
 

The serum proteins creatine kinase isoenzyme MB (CK-MB) and cardiac troponin T are classic biomarkers of cardiac ischemic damage in clinical practice, which can sensitively detect myocardial necrosis, while other two serum proteins, ischemia-modified albumin and N-terminal pro-B-type natriuretic peptide (NT-proBNP), have been recently identified as novel biomarkers of myocardial ischemia. In this study, the four biomarkers were detected in sera from 44 eligible patients with suspected coronary heart disease (CHD) before and after treadmill exercise test (TET), electrocardiogram (ECG) was measured during TET (TET-ECG) and invasive examination of coronary angiography (CAG), which is the ‘gold standard’ of CHD diagnosis, was also performed. For CAG, 25 patients were positive and 19 were negative, whereas for TET-ECG the numbers were 19 and 25, respectively. Among these four biomarkers, the NT-proBNP level in CAG positive group was much higher than those in CAG negative group both before and after TET, with statistical significance before TET (P = 0.008). Furthermore, according to receiver operating characteristic (ROC) curve, the serum biomarker NT-proBNP showed diagnostic effect of CHD and its cutoff value was 67 pg/ml, thus 30 of the patients in this study were NT-proBNP positive and 14 were negative. And it was found that NT-proBNP obviously enhanced the sensitivity of examinations whether analyzed alone or in combination with TET-ECG. More importantly, all the patients who were negative in both NT-proBNP and TET-ECG tests turned out to be CAG negative, which means that the combination of these two non-invasive examinations might take the place of invasive examination of CAG for CHD diagnosis. Further studies with more patients are warranted to validate the findings in this paper.

  P. B Mann , W Jiang , Z Zhu , P Wolfe , A McTiernan and H. J. Thompson
 

Emerging evidence indicates that intrinsic differences and induced changes in aerobic capacity are probably to play a critical role in the development of chronic diseases like cancer. This study was initiated: (i) to determine how citrate synthase activity, which is routinely used as a marker of aerobic capacity and mitochondrial density in skeletal muscle, was affected by voluntary running on either a motorized activity wheel or a non-motorized free wheel and (ii) to investigate the association between aerobic capacity and the carcinogenic response induced in the mammary gland by intraperitoneal injection of 1-methyl-1-nitrosurea. Overall, wheel running reduced cancer incidence (96 versus72%, P = 0.0006) and the number of cancers per animal (2.84 versus 1.78, P < 0.0001) and induced citrate synthase activity (276 versus 353 U/mg, P < 0.0001, sedentary control versus wheel running,respectively). Both motorized and free wheel running increased citrate synthase activity (373 ± 24, 329 ± 11 and 276 ± 9 U/mg protein, P < 0.0001) and reduced the average number of cancers per rat (2.84, 1.96 and 1.63, P < 0.01), sedentary control, free wheel and motorized wheel, respectively. However, regression analyses failed to provide evidence of a significant association between citrate synthase activity and either cancer incidence or cancer multiplicity. Citrate synthase activity is a single measure in a complex pathway that determines aerobic capacity. The multifaceted nature of intrinsic and inducible aerobic capacity limits the usefulness of citrate synthase activity alone in elucidating the relationship between aerobic capacity and the carcinogenic response.

  W Li , W Zou , D Zhao , J Yan , Z Zhu , J Lu and X. Wang
  Weida Li, Wei Zou, Dongfeng Zhao, Jiacong Yan, Zuoyan Zhu, Jing Lu, and Xiaochen Wang

During apoptosis, dying cells are quickly internalized by neighboring cells or phagocytes, and are enclosed in phagosomes that undergo a maturation process to generate the phagoslysosome, in which cell corpses are eventually degraded. It is not well understood how apoptotic cell degradation is regulated. Here we report the identification and characterization of the C. elegans tbc-2 gene, which is required for the efficient degradation of cell corpses. tbc-2 encodes a Rab GTPase activating protein (GAP) and its loss of function affects several events of phagosome maturation, including RAB-5 release, phosphatidylinositol 3-phosphate dynamics, phagosomal acidification, RAB-7 recruitment and lysosome incorporation, which leads to many persistent cell corpses at various developmental stages. Intriguingly, the persistent cell corpse phenotype of tbc-2 mutants can be suppressed by reducing gene expression of rab-5, and overexpression of a GTP-locked RAB-5 caused similar defects in phagosome maturation and cell corpse degradation. We propose that TBC-2 functions as a GAP to cycle RAB-5 from an active GTP-bound to an inactive GDP-bound state, which is...

  Y. E Nikiforov , D. L Steward , T. M Robinson Smith , B. R Haugen , J. P Klopper , Z Zhu , J. A Fagin , M Falciglia , K Weber and M. N. Nikiforova
 

Context: Thyroid nodules are common in adults, but only a small fraction of them are malignant. Fine-needle aspiration (FNA) with cytological evaluation is the most reliable tool for cancer diagnosis in thyroid nodules. However, 10–40% of nodules are diagnosed as indeterminate by cytology, making it difficult to optimally manage these patients.

Objective: The aim of this study was to establish the feasibility and role of testing for tumor-specific mutations in improving the FNA diagnosis of thyroid nodules.

Design: The prospective study included 470 FNA samples of thyroid nodules from 328 patients. At the time of aspiration, a small portion of the material was collected and tested for BRAF, RAS, RET/PTC, and PAX8/PPAR mutations. The mutational status was correlated with cytology and either surgical pathology diagnosis or follow-up (mean, 34 months).

Results: A sufficient amount of nucleic acids were isolated in 98% of samples. Thirty-two mutations were found, including 18 BRAF, eight RAS, five RET/PTC, and one PAX8/PPAR. The presence of any mutation was a strong indicator of cancer because 31 (97%) of mutation-positive nodules had a malignant diagnosis after surgery. A combination of cytology and molecular testing showed significant improvement in the diagnostic accuracy and allowed better prediction of malignancy in the nodules with indeterminate cytology.

Conclusions: These results indicate that molecular testing of thyroid nodules for a panel of mutations can be effectively performed in a clinical setting. It enhances the accuracy of FNA cytology and is of particular value for thyroid nodules with indeterminate cytology.

 
 
 
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