Objective To evaluate the utility of fluorescent dye SYTO 13 for high -resolution melting ( HRM) detection in single nucleotide polymorphism ( SNP) genotyping and its clinical application . Methods This is a performance verification study .36 genotype defined samples were divided into three groups:SNP rs3125734 C>T (class Ⅰ SNP) ,rs255758 A>C (class ⅡSNP) and rs688C>T.These samples were used to evaluate SYTO 13′s SNP genotyping capability of class ⅠSNP, classⅡSNP, and two PCR products of different lengths (52 and 107 bp) covering the same SNP of rs688C>T.The commercial HRM dye of LCGreen Plus was used as the control .The genotyping capability is indicated by the Tm difference(ΔTm) between wild type and homozygous mutant genotypes .The Tm differences between wild genotype and homozygous mutant genotype were compared using the Independent Samples t test.Paired t test was used to evaluate genotyping capability of the two dyes .The clinical applicability is evaluated by synchronously performing PCR amplification and HRM analysis on thirty -five randomly selected DNA samples with known genotypes of the three SNPs .Results The SNPs of class Ⅰ and class Ⅱ can be genotyped directly and clearly with SYTO13 (ΔTmclas Ⅰ =0.36 ±0.05,tclas Ⅰ =14.827,Pclas Ⅰ =0.000;ΔTm clas Ⅱ =0.42 ±0.110,tclasⅡ =9.539,Pclas Ⅱ =0.000).The classⅠSNP genotyping results was better using SYTO13 (ΔTmSYTO13 =0.39 ±0.027), while the SNP genotyping for small amplicon did not discriminated clearly in this study .Long amplicons of class ⅠandⅡSNPs can be identified directly except for several samples which can be genotyped accurately after having performed reexamination .Conclusion SYTO13 can apply for HRM analysis of genotyping classⅠand ⅡSNPs with long amplicon and for clinical routine detection.

Objective To study the clinical feature,treatment,and prognosis of the cytomegalovirus (CMV)pneumonia patients treated with immunosuppressor against kidney disease.Mlethod The patients received immunosuppressor against kidney disease in The First Affiliated Hospital of Sun Yat-sen University from June 1999 to December 2006.CMV antigen of leucocyte in the peripheral blood and/or bronchoalveolar lavage fluid of these patients were detected with immunocytochemical methods,and 21 patients were found suffering from CMV pneumonia.The 21 patients were introvenously injected with ganciclovir 5～10 mg/(kg?d),and the immunosuppressive agent treatment suspended.Their clinical feature and prognosis were retrospectively analyzed. Results The 21 patients received corticosteroids before CMV pneumonia contracted,of them,13 patients had been intensively treated with Methyllprednisolone with mean total dose(3.2?0.6)g.Of them,15 had been treated with cyclophosphamide with mean total dose(3.8?1.3)g.The median time from the beginning of using immunosuppressor to the onset of CMV pneumonia was 25(13～92)days.All patients had fever,cough, shortness of breath and X-ray showed interstitial pneumonia,of them,19 patients developed hypoxemia,and 11 patients' CMV antigen was positive in the leucocyte from bronchial lavage fluid.The result showed 9 patients survived and 12 died.The average duration of treatment with ganciclovir was(26.2?6.3)days. CMV pneumonia is a serious complication in patients who were treated with immunosuppressor against kidney disease.The mortality is high.Ganciclovir is a medicine of choice to treat CMV pneumonia.

Bilingual teaching is adapted to the development of higher education in china.Based on actual fact of college,teaching mode,evaluation and effect of bilingual teaching on medical microbiology were studied,which started with necessity of bilingual teaching to use original edition teaching material in English. The result would provide some gist to choice the suitable pattern of bilingual teaching for other subject of our college.

OBJECTIVETo discuss the pathological characteristics of cervical spinal fracture complicating ankylosing spondylitis (AS) and the effect of combined anterior and posterior operation.

METHODSEighteen AS patients with traumatic cervical fracture-dislocation were treated operatively from January 2000 to January 2006. The symptom duration of AS was 14.5 years on average. Three cases had undergone osteotomy in lumbar spine. There were 4 cases of Grade A, 3 cases of Grade B, 9 cases of Grade C and 2 cases of Grade D according to Frankel's score. There were 15 cases of Grade III dislocation and 3 cases of Grade II. All patients underwent surgical procedures by combined anterior and posterior approach.

RESULTSThere were 4 anterior-posterior procedures, 8 anterior-posterior-anterior procedures and 6 posterior-anterior procedures. Seven patients had one stage operation and 11 cases underwent two stage surgeries. There was certain extent of neurological improvement in 14 incomplete paraplegic patients, but no improvement in 4 complete paraplegic patients. The follow-up period was 21.2 months on average and the time for bone fusion was 3.6 months. There were 4 complications during operation and a long-term complication in follow-up.

CONCLUSIONSThe study suggests that anterior combined with posterior approach makes the spine stable and relieves the pressure immediately. It is a reasonable surgical strategy for treatment of cervical spinal fracture-dislocation with AS.

Adult ; Cervical Vertebrae ; injuries ; Humans ; Joint Dislocations ; surgery ; Male ; Middle Aged ; Postoperative Complications ; etiology ; Retrospective Studies ; Spinal Fractures ; surgery ; Spondylitis, Ankylosing ; complications

OBJECTIVETo investigate the inhibitory effect of RNA interference on chronic myeloid leukemia (CML) bcr/abl oncogene expression.

METHODSThe small interference RNAs (siRNAs) were synthesized in vitro. K562 cells stably expressing bcr/abl gene were transfected with the siRNA by electroporation, both the non-transfected cells and non-specific siRNAs transfected cells were taken as controls. The enhanced green fluorescent protein (EGFP) plasmid was used as positive control and the transfection efficiency was detected by flow cytometry. Inhibitory effect of siRNAs was demonstrated by real-time quantitative RT-PCR and Western blots. Cell proliferation was measured by MTT assay and apoptosis by Annexin V-FITC assay.

RESULTSThe transfection efficiency was about 70%. The synthesized siRNAs inhibited CML bcr/abl oncogene expression at both mRNA and protein levels. siRNAs could inhibit K562 cell proliferation to 47% and 56% at 24 h and 48 h after transfection, respectively, and induce cell apoptosis from 1.00% in control group to 15.05% and 19.4% at 24 h and 48 h respectively.

CONCLUSIONAt the cell level, inhibition of CML bcr/abl oncogene expression by chemically synthesized siRNAs provides the new method for anti-leukemia study.

Apoptosis ; genetics ; Cell Proliferation ; Fusion Proteins, bcr-abl ; genetics ; Humans ; K562 Cells ; RNA, Small Interfering ; Transfection

OBJECTIVETo study the early X-ray and CT findings of patients with severe acute respiratory syndrome (SARS).

METHODSChest radiography and CT were performed in 28 patients with SARS within one to three days after onset of the disease. CT examinations included conventional spiral CT and high-resolution CT (HRCT). The radiographic and CT findings of these patients were analyzed retrospectively.

RESULTSAbnormal CT findings were noted in all the patients, but abnormal chest radiographic findings in 17 cases (60.7%, 17/28). CT showed single small focal patchy opacities in 23 patients (82.1%, 23/28), including oval ground-glass opacities in 20 patients, lobular distribution ground-glass opacities in 2 and small patchy consolidation in one. Multi-focal ground-glass opacities were found in 2 patients and extensive opacities in three. In the 28 patients, a total of 31 lesions were found in the upper (7, 22.6%), middle (3, 9.7%), and lower lobes (21, 67.7%). The diameter of the lesions ranged from 20 to 35 mm.

CONCLUSIONThe dominant feature of early SARS patients is focal patchy opacity in the lung, and oval small ground-glass opacities are the common morphological findings on CT.

Adult ; Female ; Humans ; Male ; Middle Aged ; Radiography, Thoracic ; Severe Acute Respiratory Syndrome ; diagnostic imaging ; pathology ; Tomography, X-Ray Computed

OBJECTIVETo analyze occurrence, prevention and treatment of the complications of thoracoscopic assisted spine surgery.

METHODSRetrospective review of 182 patients who underwent standard thoracoscopic technique or video-assisted thoracic surgical procedure from October 1998 to August 2004. The treatment of thoracic diseases included debridement, decompression with (or) reconstruction. The total number of complications were recorded, and its mechanism, prevention and treatment were analyzed.

RESULTSComplications occurred in 16 patients, 12 cases of perioperative complications included 3 patients suffered from pneumonia, 3 pulmonary atelectasis, 2 patients' lung injured by trocar, 1 patient obtained transient monoplegia, 2 suffered from transient intercostal nerve pain and 1 had superficial incision infection. Long-term complications occurred in 4 cases: spinal tuberculosis relapsed 2 cases (one who had diabetes obtained relapse in 8 months of post-operation and another relapsed with complex spinal tuberculosis in 4 weeks postoperation), 2 patients suffered from kyphosis deformity and pain.

CONCLUSIONSThe type and incidence of complications with thoracoscopic spine surgery mainly depend on indication, operation procedures and anesthesia, only by limit surgical indication, ameliorate technique, obey surgical principle and consummate perioperative treatment can we obtain mini-invasive effect by thoracoscopic assisted spine surgery.

Adolescent ; Adult ; Decompression, Surgical ; adverse effects ; methods ; Female ; Humans ; Male ; Middle Aged ; Retrospective Studies ; Spinal Diseases ; surgery ; Spinal Fusion ; adverse effects ; methods ; Thoracic Vertebrae ; surgery ; Thoracoscopy ; adverse effects

OBJECTIVETo observe the effects of Shenqifuxin oral liquid(SQFXOL) on plasma kaliuretic peptide (KP), atrial natriuretic polypeptide(ANP), angiotension II (Ang II), endothelin(ET) and the left ventricular remodeling and the myocardial contractility and relaxation of left ventricle in experimental rats with heart failure(HF).

METHODThe SD rat model with HF was produced by constricting abdominal aorta. Hemodynamic parameters including maximum rate of intraventricular pressure rise (+dp/dtmax), left ventricular systolic pressure(LVSP), maximum velocity of contractile element shortening(Vmax), maximum rate of intraventricular pressure down(-dp/dtmax) and left ventricular end diastolic pressure(LVEDP) were measured by the method of the catheterization. Plasma concentrations of KP, ANP, Ang II and ET were determined by radioimmunoassays. The effects of treatment were evaluated by observing and comparing the changes of heart morphological structure, collagen element, heart weight/body weight ratio (HW/BW), left intraventricular area(LVA) and myocardial nuclei number (MNN) per square area.

RESULTIn high dose SQFXOL group, the LVSP, -dp/dtmax and Vmax were increased, while LVEDP was decreased, and plasma concentrations of KP, Ang II and ET were decreased. In comparision with those in model group, the difference was significant(P < 0.05 or P < 0.01). Though the +dp/dtmax and the level of ANP were decreased, the difference was insignificant(all P > 0.05). The collagen tissues around myocardial cells were reduced. HW/BW and LVA were lower, and MNN per square area was higher significantly (P < 0.05 or P < 0.01). The indices of +dp/dtmax in all of treatment groups and control group were not considerably different in comparison with those in model group. The levels of plasma ANP in middle dose group and low dose group were significantly lower than those in model group(all P < 0.01).

CONCLUSIONSQFXOL can reduce the plasma concentrations of KP, Ang II, ET, and ANP, improve the myocardial contractility and relaxation of left ventricular and inhibitate left ventricular remodeling in rats with HF.

Administration, Oral ; Angiotensin II ; blood ; Animals ; Astragalus membranaceus ; chemistry ; Atrial Natriuretic Factor ; blood ; Cardiotonic Agents ; administration & dosage ; pharmacology ; Drug Combinations ; Drugs, Chinese Herbal ; administration & dosage ; isolation & purification ; pharmacology ; Endothelins ; blood ; Heart Failure ; blood ; physiopathology ; Male ; Myocardial Contraction ; drug effects ; Ophiopogon ; chemistry ; Panax ; chemistry ; Plants, Medicinal ; chemistry ; Protein Precursors ; blood ; Rats ; Rats, Sprague-Dawley ; Ventricular Function, Left ; Ventricular Remodeling ; drug effects

OBJECTIVETo explore the effect of ITF2357, a novel histone deacetylase (HDAC) inhibitor, on the growth, differentiation and apoptosis of acute myeloid leukemic (AML) cells and its mechanism.

METHODSAML cell lines kasumi-1 cells as a model for AML1-ETO positive, and THP1 cells for AML1-ETO negative, the leukemic cells proliferation was analyzed by MTT assay, expression of myeloid-specific differentiation antigen and cell cycle by flow cytometry, cell apoptosis by annexin V staining and flow cytometry. AML1-ETO, acetyl-histone, and caspase protein was analyzed by Western blot.

RESULTS0.5 µmol/L ITF2357 treatment significantly inhibited kasumi-1 cells proliferation, with the 48 h half inhibitory concentration (IC(50)) of 0.1 µmol/L. The initial inhibitory concentration of THP1 cell line was 5 µmol/L. ITF 2357 induced apoptosis of kasumi-1 cells in a time- and dose-dependent manner. A dose-dependent increase in early apoptosis occurred at 24 hours treatment and in late apoptosis at 48 hours treatment by ITF2357. Early apoptosis cells increased from (1.44 ± 1.52)% to (24.51 ± 5.79)%. Late apoptosis cells increased from (2.37 ± 2.8)% to (63.66 ± 1.56)%. ITF2357 induced AML1-ETO degradation by caspase-dependent pathway. 0.25 µmol/L ITF2357 induced a time- and dose-dependent increase in expression of myeloid cell surface protein CD13 and CD15. 5 µmol/L ITF2357 blocked the cells at G(0)/G(1) phase, G(0)/G(1) cells increased from (39.69 ± 6.56)% to (79.2 ± 6.51)% and s-phase cells declined from (60.12 ± 3.29)% to (18.97 ± 6.62)%. Kasumi-1 cells incubated with 0.5 µmol/L of ITF2357, AML1-ETO protein began to decrease at 24 hours and could hardly be detected at 96 hours. ITF2357 induced AML1/ETO degradation through a caspase-dependent mechanism. At the same time, acetylated H3 and H4 increased.

CONCLUSIONLow-dose HDAC inhibitor ITF2357 can effectively inhibit the AML cells proliferation, especially for AML1-ETO positive AML cells. It inhibits Kasumi-1 cells proliferation degradation of AML1-ETO protein expression, blocks the cells at G(0)/G(1) phase, and induces apoptosis and differentiation of the cells.

Acetylation ; Apoptosis ; drug effects ; Cell Differentiation ; drug effects ; Cell Line, Tumor ; Cell Proliferation ; drug effects ; Histone Deacetylase Inhibitors ; pharmacology ; Histones ; metabolism ; Humans ; Hydroxamic Acids ; pharmacology ; Oncogene Proteins, Fusion ; metabolism

Objective To evaluate the safety of 3D printed titanium alloy trabecular reconstruction rod, bone grafts and its clinical efficacy. Methods Sixty patients with osteonecrosis of femoral head (ONFH) stageⅡ(ACROⅡ) were randomly divided into experimental group (titanium rod group) and control group (tantalum rod group). Patients were followed up at 6, 12 and 24 months after the operation. Harris score and visual analogue scale (VAS) were used to evaluate the postoperative function. Changes of X-ray were observed before and after operation. The imaging evaluation was analyzed after 24 months. Results The Harris score was decreased in titanium rod group compared with that of tantalum rod group at six-month. There were no significant differences in Harris scores for other time points between two groups. Repeated measures analysis of variance showed that there was a significant difference in time effect. The X-ray staging results changed gradually before and after operation in two groups, stage Ⅲand stage Ⅳgradually increased with time. There was progress in ONFH after operation in two groups. No infection or rejection was found in the two groups. There were higher improvement rates of stageⅡA and stageⅡB. There were no significant differences in improvement rate and hip preservation rate between two groups. The transparent lines disappeared in the positive and lateral X-ray films 6 months after the operation. No new transparent lines were found. The bone enhancement was not found in two groups of patients during follow-up period. No stress occlusion and bone trabecular bone enhancement were observed in two groups. Conclusion Titanium rods are satisfactory for the treatment of femoral head necrosis in the early stage of ACRO Ⅱ, which is not recommended for the treatment of relatively large ACROⅡC stage of necrotic area.