Objective To evaluate effects of different types of gingival flap suture on the quality of life in patients after removal of mandibular third molar. Methods A randomized, controlled clinical trial design was adopted. Sixty-two patients in oral surgery department, Stomatology Hospital of Tianjin Medical University were selected. Patients were required removal of bilateral symmetry impacted mandibular third molars, and enclosed suture (primary suture) was used in one side, open drainage suture (secondary suture) was used in the other side. The postoperative symptom severity scale (PoSSe scale) was used to evaluate the quality of life in patients after removal of mandibular third molar. The evaluation was completed 7 days after surgery, and the scale was compared between two groups. Results A total of 57 cases of clinical data were enrolled in the final analysis. The operative time for primary suture group was (17.7±4.6) min, and the operative time for secondary su?ture group was (16.3 ± 5.1) min, the difference was not statistically significant (t=1.539, P>0.05). The PoSSe score was sig?nificantly higher in primary suture group (26.348 ± 12.414) than that of secondary suture group (21.633 ± 11.382, P<0.05). Conclusion Secondary suture reduces the influence of teeth removal on quality of life in patients through relieving pain and swelling, and which is suitable for clinical application.

BACKGROUND: In vitro construction of tissue engineered cardiac muscle becomes a hot spot in recent years, and the selection and design of scaffold is the key link. However, there is lack of ideal cardiac tissue engineering scaffold material. OBJECTIVE: To evaluate the novel biodegradable polyurethane in vitro, and to discuss the feasibility of polyurethane as cardiac tissue engineeru scaffold. METHODS: A new type polyurethane (PV-Lys) was synthesized using diphenylmethane-4,4'-diisocyanate as hard segment and lysine as expand chain. The tensile and suture strength were tested in vitro respectively, hydrolytic degradation was carded out in phosphate buffer saline of pH 7.4 at 37 ℃, and cytotoxicity was evaluated by MTT measurement and morphological observation. RESULTS AND CONCLUSION: The tensile strength of the polyurethane was up to (8.1±0.1) MPa, and the suture strength was (12.2+0.8) N. The average value of the mass loss of PV-Lys was (13.1+0.3)% at 8 weeks of in vitro hydrolytic degradation. MTT assay results showed that the cytotoxic grade of the novel PV-Lys was 0-1. Cell morphology observation showed that the L929 cells were spindle-shaped or tdangular with good stretch. This PV-Lys scaffold is with favorable mechanical property, cytocompatibility, biodegradable property, which meets the requirements of tissue engineering application.

OBJECTIVETo explore the effect of Chinese herbal medicine Baotai Granule (BTG, a self-made preparation) on CD antigen blocking efficiency, prolactin (PRL) and progesterone (P) in patients with recurrent spontaneous abortion (RSA).

METHODSThirty-four women suffered from RSA were treated with BTG, twice every day, 1 package (10 g) in each time by orally intake. Changes of the efficiency of serum blocking antibody in them to the CD antigen in their husband's peripheral T-lymphocytes before and after treatment were observed. And the changes of blood levels of PRL and P were also monitored.

RESULTSFetus had successfully protected in 30 women (88.2%), in them, the efficiency of blocking to CD3, CD4 and CD8 after treatment were all higher than that before treatment, and levels of PRL and P in peripheral blood increased along with the increase of gestational age, while no obvious change was found in those who failed to complete pregnancy.

CONCLUSIONChinese herbal medicine could protect the fetus by regulating the response between endocrine and immunity network during pregnancy.

Abortion, Habitual ; drug therapy ; immunology ; Adult ; Antibodies, Blocking ; drug effects ; Antigens, CD ; drug effects ; immunology ; Drugs, Chinese Herbal ; therapeutic use ; Female ; Humans ; Phytotherapy ; Pregnancy ; Progesterone ; blood ; Prolactin ; blood ; T-Lymphocytes ; immunology

AIMTo study the relationship between changes of learning, memory and orphanin FQ (OFQ) in hippocampus of rats in acute hypobaric hypoxia at two different altitude levels of 4 500 m(moderate) and 7 500 m(serious).

METHODSHypobaric chamber, Morris water maze training method and RT-PCR technique were used in the experiment.

RESULTS(1) Compared with the control, the OFQ mRNA expression of hippocampus increased significantly after exposure to acute serious hypobaric hypoxia (8 h/d for 6 d in succession), but obviously decreased after Morris water maze training (6 times/d for 6 d in succession, the latency of place navigation was shortened). (2) After exposure to acute hypobaric hypoxia, the latency of place navigation was markedly elongated, but the OFQ mRNA of hippocampus was significantly higher than that of learning and memory group.

CONCLUSIONThe hippocampal OFQ was involved in the mechanism of decrease in spatial learning and memory induced by acute hypobaric hypoxia.

Altitude ; Animals ; Hippocampus ; metabolism ; Hypoxia ; Maze Learning ; Memory ; Opioid Peptides ; physiology ; RNA, Messenger ; genetics ; Rats ; Rats, Wistar

Adolescent ; Carcinoma, Renal Cell ; metabolism ; pathology ; Desmin ; metabolism ; Diagnosis, Differential ; Humans ; Leg ; MART-1 Antigen ; metabolism ; Male ; Melanoma ; metabolism ; pathology ; Melanoma-Specific Antigens ; metabolism ; Perivascular Epithelioid Cell Neoplasms ; metabolism ; pathology ; surgery ; Sarcoma, Clear Cell ; metabolism ; pathology ; Skin Neoplasms ; metabolism ; pathology ; surgery

BACKGROUNDCockayne syndrome (CS) is a rare human genetic disorder characterized by increased UV sensitivity, developmental abnormalities and premature aging. Cells isolated from individuals with CS have a defect in transcription-coupled DNA repair. Despite the repair defect, there is no any increased risk of spontaneous or UV-induced cancer for CS individuals. The strategy of RNA interfering was used here to explore the potential radiosensitizing and anticancer activity of targeting CS group B (CSB) gene.

METHODSThe vectors encoding CSB-specific siRNAs were constructed by inserting duplex siRNA encoding oligonucleotides into the plasmid P(silencer TM 3.1). The cell lines expressing the CSB-siRNA were generated from HeLa cells transfected with the above vectors. Colony-forming ability was used to assay cell survival. Cell cycle was analyzed by FACScan flow cytometry. The apoptosis was measured by detecting the accumulation of sub-G(1) population as well as by fluorescence staining assay. Reverse transcriptase polymerase chain reaction (RT-PCR) was used to semi-quantify mRNA expression. Protein level was detected by Western blotting analysis.

RESULTSTwo constructs encoding CSB-specific siRNA were generated, both of them resulted in remarkable suppression on CSB expression in HeLa cells, and led to an increased sensitivity to (gamma-ray and UV light. siRNA-mediated silencing of CSB decreased cell proliferation rate, increased spontaneous apoptosis as well as the occurrence of UV- or cisplatin-induced apoptosis by 2 to 3.5 fold. A significant S phase blockage and a remarkable reduction of G(1) population were induced in control HeLa cells at 18 hours after being exposed to 10 J/m(2) of UV light. The S phase blockage was also observed in UV-irradiated CSB-siRNA transfected HeLa cells, but the extent of increased S phase population was lower than that in the UV-irradiated control cells. No or a relative weak reduction on G(1) phase population was observed in UV-irradiated CSB-siRNA transfected HeLa cells. In addition, siRNA-mediated silencing of CSB promoted the elimination of G(2)/M phase cells after UV light radiation.

CONCLUSIONSsiRNA-mediated silencing of CSB causes cells to proliferate more slowly, sensitize cells to genotoxicants, and modify UV radiation-induced cell cycle changes. siRNA-mediated inactivation of CSB could be an attractive strategy for ameliorating cancer therapy, which can be fulfilled via the combination of gene therapy and sensitization of radiotherapy or chemotherapy.

Apoptosis ; radiation effects ; Cell Cycle ; radiation effects ; Cell Proliferation ; radiation effects ; Cisplatin ; pharmacology ; Cockayne Syndrome ; genetics ; Gene Silencing ; Genetic Therapy ; HeLa Cells ; radiation effects ; Humans ; RNA, Small Interfering ; genetics ; Radiation Tolerance ; Ultraviolet Rays

Objective To explore the feasibility and advantages of establishment of retrograde amnesia (RA) model in mice with such methods as electric shock,anoxia,and anesthesia.Methods Kunming mice were divided into control group and 5 treatment groups,including treatments with electric shock,anoxia,propofol,electric shock+anoxia,electric shock+propofol.At first,every group received the same dark avoidance training to establish the behavior of dark avoidance,then the 5 treatment groups were treated with the methods of 120-180 V electric shock,anoxia within a closed container,intraperitoneal injection of 0.3 mL of propofol,electric shock+anoxia,electric shock+propofol,respectively.Next day,step-in latency (Lat) of mousse were measured with the dark chamber in all groups and changes of dark avoidance behavior were analyzed.Results The Lat in the control group 24 h after dark avoidance training was (111.7+17.2) s.In the treatment groups of electric shock,anoxia,electric shock+anoxia,electric shock+propofol,significantly shortened Lat,which limited to 30 s in some mice 24 hatter corresponding treatment,was observed as compared with that in the control group (P<0.05).Except for the propofol treatment group did not changed obviously,the incidence rate of shortened Lat was 43.8%,45.4%,66.7% and 60% in the electric shock treatment group,anoxia treatment group,electric shock+anoxia treatment group,and electric shock+propofol treatment group,respectively.On the 5th and 8th d,some mice recovered from the shortened Lat.Conclusion RA model can be established successfully in some mice treated with electric shock,anoxia,electric shock+anoxia,electric shock+propofol and the highest modeling rate was found in the electric shock+anoxia treatment group.RA can recover in the later stage in some modeling mice and use of pmplfol alone call not induce RA.

Objective To explore the possible mechanisms that cause the dentate gyrus (DG) neurons to play different roles in information coding. Methods In vivo extracellular single unit recording was performed on 22 waking female guinea pigs, which were positioned in a sound-attenuated recording chamber without any muscular relaxants. The spontaneous firing patterns of the DG neurons were detected and compared. Results There were two different electrophysiological populations in the DG of guinea pigs, principal cells (PCs) and fast spiking interneurons (INs). Of the PCs, 1.3% discharged regularly, 48.1% irregularly and 50.6% in bursts; in contrast, of the INs units, 64.1% discharged regularly, 2.6% irregularly and 33.3 % in bursts. The spontaneous firing patterns of PCs were significantly different from those of INs (P <0.01). In addition, the differences of several interspike interval (ISI) parameters also have been observed: (1) the ISI coefficients of variation of PCs (3.39 +/- 3.56) were significantly higher than those of INs (1.08 +/- 0.46) (P < 0.01 ); (2) the ISI asymmetric indexes of PCs (0. 047 +/- 0. 059) were significantly lower than those of INs (0. 569 +/-0. 238) (P < 0.01). Conclusion In the DG, the spontaneous firing patterns of PCs were significantly different from those of INs. The former were prone to fire in bursts, the latter were prone to fire regularly. The different roles in information coding between PCs and INs might be caused by their different firing patterns.

AIMTo develop simple but reliable intracellular labelling method for high-resolution visualization of the fine structure of single neurons in brain slice with thickness of 500 microm.

METHODSBiocytin was introduced into neurons in 500 microm-thickness brain slices while blind whole cell recording. Following processed for histochemistry using the avidin-biotin-complex method, stained slices were mounted in glycerol on special glass slides. Labelled cells were digital photomicrographed every 30 microm and reconstructed with Adobe Photoshop software.

RESULTSAfter histochemistry, limited background staining was produced. The resolution was so high that fine structure, including branching, termination of individual axons and even spines of neurons could be identified in exquisite detail with optic microscope. With the help of software, the neurons of interest could be reconstructed from a stack of photomicrographs.

CONCLUSIONThe modified method provides an easy and reliable approach to revealing the detailed morphological properties of single neurons in 500 microm-thickness brain slice. Without requisition of special equipment, it is suited to be broadly applied.

Animals ; Image Processing, Computer-Assisted ; Neurons ; cytology ; physiology ; Patch-Clamp Techniques ; Rats ; Rats, Sprague-Dawley ; Software ; Staining and Labeling ; methods

Carcinoma, Adenosquamous ; diagnosis ; Carcinosarcoma ; diagnosis ; Female ; Humans ; Middle Aged ; Thymus Neoplasms ; diagnosis