Biomedical subjects

Jian-ting Chen

Publications and source records attributed to Jian-ting Chen.

12 recordsLinked to original sources

PubMed2006

[Analysis of the long-term outcome of anterior approach surgery on cervical spondylotic myelopathy].

OBJECTIVE: To investigate the long-term efficacy of anterior approach surgery on cervical spondylotic myelopathy and factors affecting prognosis. METHODS: The data in 116 patients suffered from cervical spondylosis from January 1992 to December 2000 were reviewed, including 80 male cases and 36 female cases, whose age ranged from 36 to 76 years (mean, 51 years). The preoperative course of disease was 2 months to 20 years (mean, 19 months). There were 65 cases (56.0%) with single segments involved, 44 cases (37.9%) with two segments, 7 cases (6.0%) with three segments. Ninety-eight cases were onset slowly, 18 cases with no remote cause and aggravating quickly. Three kinds of surgeries were performed: anterior cervical decompression and autoiliac bone interbody fusion, anterior cervical decompression and fusion with threaded fusion cage, anterior cervical decompression and autoiliac bone interbody fusion with anterior screw-plate system. Improvement in spinal cord function was assessed using the Japanese Orthopaedic Association (JOA) scoring system, the long-term efficacy and influential factors were also analyzed. RESULTS: The mean follow-up time was 7 years and three months (5 - 12 years). The mean preoperative JOA score was 9.34 +/- 1.81. The mean postoperative JOA score was 10.35 +/- 1.85. At the final follow-up, the JOA score was 14.09 +/- 1.90 and the recovery rate was 63.2%. Among the total patients, 27 cases were excellent, 47 cases were fine, 23 cases were good, 19 cases were poor, the fineness rate was 63.8%. The long-term efficacy of anterior approach surgery has close correlations with time of course, age of onset, preoperative spinal cord function and the number of affected segments, but has no correlations with modes of fusion and internal fixation. CONCLUSIONS: The patients will be attentively observed while having a definite diagnosis of cervical spondylotic myelopathy. The good long-term results will be obtained after early anterior cervical decompression and fusion.

Adult↗

PubMed2006

[Kyphoplasty using an enhanced balloon expander: an experimental study].

OBJECTIVE: To test the efficacy of kyphoplasty using an enhanced balloon expander in restoring the height of vertebral compression fractures (OVCF). METHODS: Fifteen lumbar vertebral bodies (L1-L5) were harvested from 3 young male fresh cadavers and separated into individual vertebral bodies with the bilateral pedicles of the vertebral arch removed. Before operation, plain X-ray films of all the vertebral bodies were obtained. All the vertebral bodies were compressed lengthwise to approximately 80% of their original heights using a universal material-testing machine to result in compression fractures. Post-compression vertebral bodies were then repaired using an enhanced balloon expander, and the delivery of the bone cement into the vertebral bodies was observed. The heights of the anterior and posterior borders of the vertebral bodied were measured before and after compression as well as after kyphoplasty. RESULTS: The inflation of the balloon expander averaged 2.95-/+0.18 ml and the pressure was 122.67-/+27.89 psi (1 psi=6895 Pa). Kyphoplasty resulted in significant restoration of the vertebral body height lost due to the compression (P<0.01). CONCLUSION: Kyphoplasty using an enhanced balloon expander may restore vertebral body height damaged by compression and correct the kyphotic deformity. The balloon expander can be a effective and economic choice for kyphoplasty for its relatively low cost.

Adult↗

PubMed2004

[The selection of the surgical approach in the management of fracture and dislocation of lower cervical spine combined spinal cord injury].

OBJECTIVE: To investigate how to select an appropriate surgical approach in the management of fracture and dislocation of lower cervical spine combined spinal cord injury. METHODS: The clinical data of 54 patients of lower cervical spine fracture and dislocation were retrospectively analyzed. There were 29 cases with vertebral body compressive fracture and dislocation, 7 cases with vertebral body bursting fracture and dislocation, 3 cases with unilateral facet dislocation, 15 cases with bilateral facet dislocation. All cases were associated with spinal cord injury. According to American Spinal Injury Association (ASIA) grades, 21 cases were in A grade, 5 cases in B grade, 22 cases in C grade and 6 cases in D grade. All patients had surgical reduction, decompression, stabilization and fusion, 43 cases in anterior approach and 11 cases in posterior approach. RESULTS: All patients were followed up in 12 to 36 months, the mean follow-up time was 18 months. There were no great vessels, trachea, esophagus or spinal cord iatrogenic injury. There were no pull-out and breakage of screws or plates. Fusion was achieved in all patients at an average of 12 weeks postoperatively. There were no pseudarthrosis or bone nonunion. Of all the patients, 96.3% were acquired completely reduction and the normal intervertebral height and lordosis were maintained. Patients with complete spinal cord had no neurologic recovery, but they felt relief from upper limb pain or numb. Incomplete spinal cord lesions improved on average 1-2 Frankel grade after surgery. CONCLUSIONS: For lower cervical spine fracture and dislocation, an ideal anatomy reduction can be obtained with either anterior or posterior approach surgery. It is important to select a suitable surgical approach according to different types of cervical fracture and dislocation.

Adolescent↗

PubMed2004

[Molecular cloning and expression of human PDGF-B chain mature peptide gene].

OBJECTIVE: To acquire sufficient PDGF-BB protein and provide the basis for the further studies of its role on the fracture healing and trauma reconstruction and its clinical applications. METHODS: Constructed the prokaryotic expression vector pQE-PDGF-B with the gene rearrangement technique, and the monomeric form of recombinant PDGF-B expressed in E. coli M15. RESULTS: PDGF-B mature peptide gene was inserted into prokaryotic expression vector pQE30, which was confirmed by PCR, enzyme digestion and sequencing identification; the expressed products of pQE-PDGF-B in E. coli showed a single protein on SDS-PAGE, and their expression level was about 15% of the total bacterial protein. The molecular weight of the purified PDGF-B protein was about 15 KDs on SDS-PAGE. CONCLUSIONS: The construction of recombinant plasmid and preparation of the monomeric protein of PDGF-B provides a solid foundation for further studying the function of PDGF-BB and producing biologically PDGF-BB protein.

Becaplermin↗

PubMed2004

[Construction and identification of yeast expression vectors containing human platelet-derived growth factor B-chain gene].

OBJECTIVE: To investigate the expression efficiency of human platelet-derived growth factor B-chain (PDGF-B) gene in yeast and assess the activity of the expressed product. METHODS: A full-length complementary DNA of human PDGF-B gene was amplified from the total RNA extracted from human vascular endothelial cells using reverse transcription (RT)-PCR and then cloned into pGEM-T vector. The PCR products with specific primers were recombined into yeast expression plasmids pMETB or pMETalphaA, followed by identification with restriction endonuclease. RESULTS: The 578 bp fragment encoding mature PDGF-BB peptide with signal peptide and the 340 bp fragment without signal peptide were identified and verified by restriction endonuclease mapping and sequencing, and two yeast expression vectors pMETB-PDGFB(1) and pMETalphaA-PDGFB(2) were reconstructed. CONCLUSION: The yeast expression vectors containing human PDGF-B gene have been successfully constructed for further studies of gene expression in yeast.

Becaplermin↗

PubMed2004

[Distribution of -477C/T single nucleotide polymorphism in the promoter region of ABCA1 gene and its significance for plasma lipids levels in normal Chinese Han population].

OBJECTIVE: To investigate the distribution of -477C/T single nucleotide polymorphisms (SNP) in the promoter region of ATP binding cassette transporter (ABCA1) gene and its relation to plasma lipid levels in normal Chinese Han population. METHODS: The three genotypes of -477C/T polymorphisms in the promoter region of the ABCA1 gene were detected using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) in 113 normal Chinese Han subjects. RESULTS: -477C/T SNP was present in normal Chinese Han population, and 37.2% (42) of the examined subjects belonged to the genotype of CC, 46.9% (53) belonged to CT and 15.9% (18) to TT. The individuals with the TT genotype had a lower plasma high-density lipoprotein cholesterol (HDL-C) level than those with the CC genotype (P<0.05). No association was found between the genotypes and plasma levels of total cholesterol, triglyceride, low-density lipoprotein, very low-density lipoprotein and body mass index. CONCLUSION: The TT genotype significantly influences the plasma levels of HDL-C in normal Chinese Han individuals.

ATP Binding Cassette Transporter 1↗

PubMed2004

[Diaphyseal defect repair with nacre/polylactic acid composite artificial bone in rabbits].

OBJECTIVE: To evaluate the biocompatibility, degradation and bone formation activity of a new bone substitute for bone grafting, nacre/polylactic acid composite artificial bone (NPCB). METHODS: Radial bone defects 1.5 cm in length were induced in 32 New Zealand rabbits and immediately filled with NPCB or nothing. The animals' local and whole body responses to the implants were observed after the operation, and the serum calcium levels were detected 1 week and 4 weeks postoperatively. Tissue response, new bone formation in the defects and degradation of the implants were evaluated by X-ray, and examination of the bone mineral content (BMC) in the defects and histomorphological analysis were performed after the rabbits were sacrificed. RESULTS: All the rabbits survived the operation and the incisions healed smoothly. No significant difference was noted in the serum calcium level between 1 day before operation, 1 week and 4 weeks postoperation. BMC in the defects of the rabbits with NPCB grafts increased more rapidly than that in the control group 6-12 weeks after the operation and began to decrease after 12 weeks. Gross, X-ray and histological observations revealed that NPCB possessed osteoconductive activity and new bone ingrowth in the implants was found during the whole experiment. At 16 weeks, the defects grafts were almost completely repaired with NPCB while the defects in the control group remained nonunion. Biodegradation of the implants was observed early at 6 weeks, with numerous macrophage and multinuclear giant cells containing phagocytosed NPCB particles around the implants at 12 weeks, but NPCB remnants were still visible at 16 weeks. CONCLUSION: As a bone substitute, NPCB possesses good biocompatibility, biodegradability and osteoconductive activity.

Absorbable Implants↗

PubMed2003

[Cloning and expression of insulin-like growth factor-1 platelet-derived growth factor-AA, and tumor growth factor beta1 genes in adenovirus vector].

OBJECTIVE: To establish recombinant adenovirus highly expressing genes of insulin-like growth factor-1 (IGF-1), platelet-derived growth factor-AA (PDGF-AA), and tumor growth factor beta1 (TGF beta 1) to be used in gene therapy. METHODS: Normal human osteoblasts were obtained from cancellous bone of lilium left from bone grafting and then cultured. Total RAN was extracted and IGF-1, PDGF-AA, and TGF beta 1 cDNAs was obtained by RT-PCR. Vector p-Shuttle containing these cNDAs was cloned into adenovirus and then the recombinant adenovirus was transfected into HEK293 cells. Recombinant adenovirus containing reporter gene LacZ was used in control group. Western blotting was used to detect the expression of these growth factors. Human osteoblasts were cultured and transfected with recombinant adenovirus. MTT method was used to detect the proliferation of the cells. Paranitrophenol method was used to examine the activity of alkaline phosphatase (ALP) in osteoblasts. RESULTS: Expression of IGF-1, PDGF-AA, and TGF beta 1 cDNA and expression of IGF-1, PDGF-AA, and TGF beta 1 proteins were found in HEK293 cells transfected with the recombinant adenovirus and not in the control HEK293 cells. The proliferation and ALP activity of osteoblasts transfected with the recombinant virus were significantly increased in comparison with those of the control osteoblasts (all P < 0.010). Immunohistochemical staining showed significant brown particles in the osteoblasts transfected with the recombinant virus and none in the control osteoblasts. CONCLUSION: The recombinant adenovirus thus constructed expresses the proteins of several growth factors with bioactivity in human cells and can be used as a satisfactory gene tool.

Adenoviridae↗

PubMed2003

[One-stage surgical management for spinal tuberculosis].

OBJECTIVE: To evaluate the clinical efficacy of one-stage surgical management for spinal tuberculosis. METHODS: Fifty-seven patients with thoracic, thoracolumbar and lumbar spinal tuberculosis were treated surgically by a single stage procedure from Jan 1996 to Jan 2001, including anterior resection, interbody outografting and anterior instrumentation in 35 cases, posterior debridement and posterior instrumentation in 16 cases, and posterior instrumentation and anterior resection plus interbody autografting in 6 cases. Titanium-alloy spinal implants were used in 38 cases and stainless steel implants in other 19 cases. Except for three patients, other 54 patients were followed up for one to five years (mean 2.2 years). RESULTS: All these patients had their incision healed by first intention without chronic infection or sinus formation, and no recurrence of spinal tuberculosis was noted in any patient during the follow-up period. Kyphosis correction were achieved by 21.6 degrees on the average postoperatively. There was a mild loss (2 degrees - 4 degrees) of kyphosis correction during follow-up period. Spinal solid fusion at the interface between the graft and adjacent vertebral bodies was shown radiologically in 3.8 months on the average. CONCLUSION: One-stage surgical management has more advantages in that it can completes all the aspects of surgical treatment for spinal tuberculosis. Anterior or posterior instrumentation with titanium-alloy or stainless steel spinal implants is safe, The selection of one-stage surgical procedure should be planed individually.

Adolescent↗

PubMed2003

[In vitro biocompatibility and degradation of nacre/polylactic acid composite artificial bone].

OBJECTIVE: To investigate the in vitro biocompatibility and degradation of nacre/polylactic acid composite artificial bone (NPCB) grafts. METHODS: Human osteoblast cells were cultured with NPCB discs for observation of the morphological features and cell proliferation by optical microscope and scanning electron microscope. The mass loss of NPCB discs and pH variations of the saline in which the discs were immersed were examined every 2 weeks in a course of 16 weeks in vitro. RESULT: Compared with the negative control group, NPCB showed no visible cytotoxicity and facilitated the growth and proliferation of the osteoblast cells. As the immersion prolonged, gradual decrease in the mass of NPCB was observed accompanied by regular pH alteration of the saline. CONCLUSION: NPCB possesses good in vitro biocompatibility and may be gradually degraded.

Biocompatible Materials↗

PubMed2003

[Treatment of spondylolysis and spondylolisthesis with posterior STB thoracolumbar transpedicular screw-plate spine fixation system].

OBJECTIVE: To observe the clinical effect of a self-designed posterior STB thoracolumbar transpedicular screw-plate system in the treatment of spondylolysis and spondylolisthesis. METHODS: This STB screw-plate system is developed with titanium alloy (TC4, Ti6Al4V). During December, 1999 and January, 2001, this system was applied in 51 cases, including lumbar spondylolysis and spondylolisthesis (36 cases), degenerative lumbar instability (15 cases). The patients were aged 22 - 78 years, mean age: 47.5 - years; among them there were 14 male cases, 37 female cases; There were 15 cases degenerative spondylolisthesis with grade I-II slip, 36 cases of spondylolysis and spondylolisthesis, including 34 cases with grade I-II slips and 2 cases with grade III slips; single level of 33 cases, two levels 3 cases. Decompression was performed for the 43 cases with interbody fusion using iliac crest or bilateral-lateral fusion using demineralized bone matrix and 8 cases were fixed with demineralized bone matrix fusion without decompression. RESULTS: All the operations heeded about 60 - 120 minutes, and during the operations bleeding amounts were 200 - 500 ml. The cases completely recovered to work or normal action after 3 months of surgeries. 46 of all cases were achieved to satisfactorily reduction and clinical effect, 5 cases of grade II-III remained incomplete reduction (grade I slip). CONCLUSION: This STB system has advantages of biomechanical stability and reduction capability and its effect in clinical application is undoubtedly positive.

Adult↗

PubMed2002

[Application of BACTEC MGIT 960 system and molecular identification of mycobacteria in the diagnosis of spinal tuberculosis].

OBJECTIVE: To evaluate the clinical application of BACTEC MGIT 960 system and molecular identification of mycobacterium species in diagnosis of spinal tuberculosis. METHODS: Thirty-one specimens were obtained from patients with spinal tuberculosis, followed by culturing with BACTEC MGIT 960 system and in Löwenstein-Jensen (L-J) medium respectively. Mycobacterium species of the clinical isolates were identified with PCR amplification of IS986 and PCR-single-strand conformation polymorphism (PCR-SSCP) analysis of 16S rRNA, with the conventional identification approach serving as control. RESULTS: The positivity rates of mycobacterium culture with BACTEC MGIT 960 system and L-J medium were 83.87 % and 61.29 % respectively. The average detection time with BACTEC MGIT 960 were 11.3 d, 15.4 d shorter than that with the L-J medium (26.7 d). The genetic identification of mycobacterium species was more rapid and accurate with consistent results with that from conventional method. CONCLUSION: BACTEC MGIT 960 system is preferable for detecting mycobacteria in spinal tuberculosis. The combined application of this instrument with genetic identification of mycobacteria is an effective strategy for the bacteriological diagnosis of tuberculosis.

Adolescent↗