Biomedical subjects

Bing Zhang

Publications and source records attributed to Bing Zhang.

114 records · Page 7Linked to original sources

PubMed2002

[Application of autogenous bone grafting with vascular anastomosis in treatment of nonunion of fracture and bone defect].

OBJECTIVE: To present a surgical choice for nonunion and bone defect. METHODS: From November 1994 to October 1997, 17 cases of nonunion of fracture and massive bone defect were treated by autogenous iliac bone and fibular bone with vascular anastomosis. Of 17 cases, there were 10 cases of nonunion of bone fracture, 7 cases of bone defect following tumor resection (4 cases of benign and 3 cases of malignant). Autogenous fibular bone grafting with vascular anastomosis, ranging from 12 cm to 29 cm in length, were employed in 12 cases; autogenous iliac bone grafting, ranging from 7 cm x 3 cm to 9 cm x 5 cm in size, were utilized in the other 5 cases. All of 17 cases were followed up for 10 months to 5 years, 3 years and 7 months in average, and were evaluated from clinical manifestation. RESULTS: Bone union was achieved in 10 cases of nonunion of fracture after bone grafting, bony refilling of the bone defect was observed in 4 cases due to benign tumor and 1 case due to malignant tumor. The other 2 cases of malignant tumor died from lung metastasis of the tumor 10 months and 12 months after bone grafting, respectively. CONCLUSION: Bone grafting is an effective surgical option in treatment of nonunion of fracture and bone defect.

Adolescent↗

PubMedDate not supplied

An alternative strategy to determine the mitochondrial proteome using sucrose gradient fractionation and 1D PAGE on highly purified human heart mitochondria.

An alternative strategy for mitochondrial proteomics is described that is complementary to previous investigations using 2D PAGE techniques. The strategy involves (a) obtaining highly purified preparations of human heart mitochondria using metrizamide gradients to remove cytosolic and other subcellular contaminant proteins; (b) separation of mitochondrial protein complexes using sucrose density gradients after solubilization with n-dodecyl-beta-D-maltoside; (c) 1D electrophoresis of the sucrose gradient fractions; (d) high-throughput proteomics using robotic gel band excision, in-gel digestion, MALDI target spotting and automated spectral acquisition; and (e) protein identification from mixtures of tryptic peptides by high-precision peptide mass fingerprinting. Using this approach, we rapidly identified 82 bona fide or potential mitochondrial proteins, 40 of which have not been previously reported using 2D PAGE techniques. These proteins include small complex I and complex IV subunits, as well as very basic and hydrophobic transmembrane proteins such as the adenine nucleotide translocase that are not recovered in 2D gels. The technique described here should also be useful for the identification of new protein-protein associations as exemplified by the validation of a recently discovered complex that involves proteins belonging to the prohibitin family.

Blotting, Western↗

PubMedDate not supplied

Expanded coverage of the human heart mitochondrial proteome using multidimensional liquid chromatography coupled with tandem mass spectrometry.

Recent evidence suggests that mitochondria are closely linked with the aging process and degenerative disorders such as Alzheimer's disease and Parkinson's disease. Thus, there has been increasing interest in cataloging mitochondrial proteomes to identify potential diagnostic and therapeutic targets. We have previously reported results of a one-dimensional electrophoresis/liquid chromatography MS/MS study to characterize the proteome of normal human heart mitochondria (Taylor et al. Nat. Biotechnol. 2003, 21, 281-286). We now report two subsequent studies where multidimensional liquid chromatography MS/MS was investigated as an alternative means for characterizing the same sample.

Chromatography, Liquid↗

PubMedDate not supplied

Genetic and molecular analysis of synaptic vesicle recycling in Drosophila.

Following exocytosis, one of the major presynaptic events is replenishing synaptic vesicles (SVs) to ensure the possibility of continuous synaptic transmission. The nerve terminal is thought to recycle SVs through clathrin-mediated endocytosis and by a clathrin-independent pathway called "kiss and run". This review highlights the use of the genetic model organism, the fruit fly (Drosophila melanogaster), in dissecting the molecular mechanisms of clathrin-mediated endocytosis in recycling SVs at neuromuscular junctions (NMJs). Analyses of endocytotic mutants in Drosophila indicate that clathrin-mediated endocytosis may be essential for SV recycling, including a putative fast recycling mechanism uncovered recently. Further, a rather complex picture begins to emerge suggesting that clathrin-mediated endocytosis involves several sequential steps mediated by a large number of proteins. Finally, these studies also reveal that SV proteins may be selectively retrieved into nascent SVs by clathrin accessory proteins and defects in protein retrieval have significant impacts on synaptic transmission. Following the completion of the Drosophila Genome Project and the development of gene targeting and RNAi approaches, genetic studies in Drosophila have become increasingly efficient. Hence, Drosophila is expected to continue to serve as an important model organism for studies of SV recycling.

Animals↗

PubMedDate not supplied

Lower specificity of occult-blood test on stool collected by digital rectal examination.

BACKGROUND/AIMS: To compare the diagnostic accuracy of an immunochemical fecal occult-blood test for colorectal cancer between the stool specimens obtained during the routine screening and those during the digital rectal examination. METHODOLOGY: One hundred and fourteen patients with colorectal cancer and 228 healthy controls served as subjects of the study. Fecal occult-blood was tested by both of two methods; by the routine screening and by the digital rectal examination, and the sensitivity and specificity of an immunochemical fecal occult-blood test were determined in these two methods. RESULTS: The sensitivity and specificity were 79.8% and 96.5% in the routine screening method, and 86.0% and 79.8% in the digital rectal examination method, respectively, showing a significant difference in the specificity (P < 0.01) between these two stool collection methods. There was no significant difference in the sensitivity between these two stool collection methods. CONCLUSIONS: These findings indicate that the stool specimens collected at the time of the digital rectal examination is not suitable for testing of fecal occult-blood.

Colorectal Neoplasms↗

PubMedDate not supplied

Sensitivity of immunochemical fecal occult blood test for colorectal flat adenomas.

BACKGROUND/AIMS: To assess the sensitivity of an immunochemical fecal occult blood test for colorectal flat adenomas, and to determine the relation between the size of flat adenomas and the results of this test. METHODOLOGY: Eleven colorectal flat adenomas under 1cm, 18 flat adenomas 1cm or larger, 187 polypoid adenomas under 1cm, 42 polypoid adenomas 1cm or larger and 144 healthy controls were investigated. Each subject was tested with an immunochemical occult blood test on two consecutive days, and the accuracy of this test was evaluated. RESULTS: The sensitivity of this test was 18% for flat adenomas under 1cm, 67% for flat adenomas 1cm or more, 19% for polypoid adenomas under 1cm and 60% for polypoid adenomas 1cm or more. Specificity was 95%, showing a significant difference in the sensitivity between flat adenomas 1cm or more and those under 1cm (p<0.05) as well as a significant difference between flat adenomas 1cm or more and polypoid adenomas under 1cm (p<0.001), whereas no significant difference was seen in the sensitivity between flat adenomas 1cm or more and polypoid adenomas 1cm or more. CONCLUSIONS: These results indicate that the sensitivity of immunochemical occult test for flat adenomas was similar to the sensitivity for common polypoid adenomas. The size of adenomas is a more important morphological factor for determining the sensitivity of this fecal occult blood test.

Adenocarcinoma↗