OBJECTIVETo study role of dental follicle in tooth root development.

METHODSSixteen mandibular first molar dental germs from eight five-day postnatal Balb/c mice were divided into two groups randomly. Dental follicle of germs in one group was undetached and that of another group was removed. Subsequently, each of the germs was separately transplanted to back-muscles of adult nude mice. At seventh and fourteenth day after transplanting, the germs were collected, fixed, demineralized, dehydrated, and embedded in wax in sequence. Serial sections of 5 microm thick were made following the routine methods, stained with haematoxylin-eosin dying solution, and observed under a light microscope.

RESULTSAll implantations were located in the back-muscles with abundant capillary vasculature. Under microscope, although all tooth germs could further develop after grafting, tooth germs without dental follicle developed slowly with small size and low calcification compared to those with dental follicle. Although position of Hertwig's epithelial root sheath of all germs seemed no changing, roots of the group with dental follicle could further develop and the roots develop toward the apical direction; this tendency couldn't be seen in the germs of another group. Inflammatory cells could be seen in and out of the pulp cavity of the two groups at 7th day after grafting, while no obvious inflammatory cell was observed at 14th day after grafting.

CONCLUSIONDental follicle play an important role in tooth root development. It probably can lead tooth root to develop in normal direction.

Animals ; Dental Pulp Cavity ; Dental Sac ; Enamel Organ ; Mice ; Mice, Nude ; Molar ; Odontogenesis ; Tooth ; Tooth Germ ; Tooth Root

etabolic response to radiotherapy may predict the prognosis of paitents with locally advanced NPC. The prognosis is poor for patients with high FDG uptake before and after radiotherapy or SUV max-NSUV max-P .

Objective To analyze alterations in electrocardiogram (ECG) of adenosine test in 99Tcm-MIBI myocardial perfusion imaging(MPI)SPECT study. Methods A total of 641 patients were in cluded in the study. The patients each underwent 99Tcm-MIBI MPI with adenosine test. The ECGs were taken before, during, and after adenosine infusion. Results In all, abnormal ECGs were found in 205(32.0%) patients. During adenosine infusion, 20.6%(132/641) of patients suffered from arrhythmia,29.5%(39/132) had atrial premature beats, 34. 1% (45/132) had premature ventricular beats, and 6. 1% (8/132) had sinoatrial block. In addition, 5.3% (7/132) had first-, 24.2% (32/132) had second-, and 0.8%(1/132) had third-degree atrioventricular block (AVB). After adenosine infusion, 4.4%( 28/641) of patients suffered from arrhythmia, 57.1% (16/28) had atrial premature beats, 39.3%(11/28) had premature ventricular beats, and 3.6% (1/28) had sinoatrial block. The perfusion images showed ischemia in 36 patients and infarction in 8 patients. Adenosine infusion was terminated in 39 patients (6. 1%) because of poorly tolerated side effects. However, no death or acute myocardial infarction occurred in the study. Conclusions Adenosine pharmacologic test for 99TcmMIBI MPI may result in relatively high incidence of arrhythmia in ECG monitoring.

OBJECTIVETo study the distribution and expression of fibromodulin, decorin and biglycan in developing normal periodontal tissues, so as to understand its role in periodontal tissue formation.

METHODSThirty six BALB/c mice in different developing stages were killed and their bilateral mandibular first molars with surrounding alveolar bones and gingival tissues were taken out, Power Vision two steps immunohistochemical method with anti-fibromodulin, anti-decorin and anti-biglycan was used to detect the tissue distribution and cellular localization of fibromodulin and related proteoglycans, decorin and biglycan.

RESULTSFibromodulin was strongly expressed in the subcutaneous gingival connective tissue, periodontal ligament, mainly in gingival and periodontal fibroblasts as well as their matrices. Strong expression was also noted in the area close to the interfaces of periodontal ligament-alveolar bone and periodontal ligament-cementum. Decorin was strongly expressed in the area of gingival connective tissue, periodontal ligament and the surface of alveolar bone, while biglycan was stained evidently in gingival connective tissue throughout the period of investigation, but negative in the surface of alveolar bone and osteoblasts.

CONCLUSIONSFibromodulin may interact with decorin and biglycan to regulate the network formation of gingival connective tissues and periodontal collagen fibers, and may be involved in mineralization of the alveolar bone and cementum.

Alveolar Process ; cytology ; growth & development ; Animals ; Biglycan ; Decorin ; Extracellular Matrix Proteins ; analysis ; Fibromodulin ; Gingiva ; chemistry ; growth & development ; Immunohistochemistry ; Mice ; Mice, Inbred BALB C ; Osteoblasts ; chemistry ; Periodontal Ligament ; chemistry ; growth & development ; Proteoglycans ; analysis ; Tooth Germ ; chemistry

Objective To investigate the expression of calcineurin 1 (RCAN1) regulator and calcineurin A (Ca-NA) in brain tissue of temporal lobe (TLE) epilepsy patients and pentylenetetrazol (PTZ)-induced rat model. Methods Cortical samples from 18 patients with temporal lobe epilepsy were collected as epilepsy group and corti-cal samples from 11 patients with brain trauma were used as control group. 30 SD rats were randomly divided into model control group (MC) and PTZ group. The expression of RCAN1 and CaNA in human brain cortex,rat cortex and rat hippocampus were detected by Western blot and Immunohistochemistry assay. The location analysis of RCAN1 was detected by immunofluorescence. Moreover,co-immunoprecipitation was used to test whether there was an interaction between RCAN1 and CaNA. Results RCAN1 mainly located in neuronal cytomembrane.The expres-sion of RCAN1 was down-regulated and expression of CaNA was up-regulated both in the epileptic patients and epi-leptic rats (P<0.01). RCAN1 interacted with CaNA. Conclusions Decreased expression of RCAN1 and increased expression of CaNA indicate that RCAN1 may be involved in the epileptogenesis by regulating CaNA.

To prepare a soluble human extracellular III domain of Flt1 and analyze its biological activity. The gene encoding extracellular domain III of Flt-1 was cloned into the expression vector pAZY by RT-PCR from human umbilical vein endothelial cell (HUVEC), and induced to express in Escherichia coli by low phosphoric medium, the product was purified by E-tag affinity chromatography. SDS-PAGE and Western blotting analysis showed that Flt-1 gene domain III gene was expressed in E. coli and the yield of the soluble fusion protein was about 1.10 mg/L. Enzyme-Linked ImmunoSorbent Assay (ELISA) revealed that the Flt-1 domain III was able to bind to VEGF165 dose-dependently. Monolayer denudation assay and Transwell assay showed that the fusion protein could inhibit HUVECs migration induced by conditional medium with 50 ng/mL VEGF165 and 100 ng/mL bFGF. In conclusion, Flt-1 gene domain III gene has been successfully cloned and expressed in E. coli, which will be useful in both the research on the function of Flt-1 gene domain III and preparation of anti-Flt-1 monoclonal antibody in the future.
Cloning, Molecular ; Endothelial Cells ; cytology ; metabolism ; Escherichia coli ; genetics ; metabolism ; Extracellular Space ; metabolism ; Genetic Vectors ; genetics ; Humans ; Recombinant Fusion Proteins ; genetics ; isolation & purification ; metabolism ; pharmacology ; Solubility ; Umbilical Veins ; cytology ; Vascular Endothelial Growth Factor Receptor-1 ; genetics ; isolation & purification ; metabolism

OBJECTIVETo determine the relative molecular mass of marine collagen peptides (MCPs) and investigate the effects of MCPs on serum lipids, anti-oxidative enzymes and malondialdehyde (MDA) in hyperlipidemic rats.

METHODSSephadex G-25, high performance liquid chromatography (HPLC) and matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF-MS) methods were used to determine the relative molecular mass of MCPs. Then 50 healthy male SD rats were divided into 5 groups, which were normal control (NC) group, hyperlipidemic model control (HC) group and 1.0, 3.0, 9.0 g/kgbw MCPs groups, MCPs were orally administered by gavage to rats in MCPs group for 45 consecutive days (2 ml/100 kgbw per day), and the control rats were given vehicle only, all animals (except NC rats) were fed with a high fat diet composed of 79% basic diet, 10% lard, 10% yolk powder and 1% cholesterol. The levels of serum lipids, the content of MDA and activity of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) in serum were measured.

RESULTSThe levels of serum total cholesterol (TC) in 1.0, 3.0, 9.0 g/kgbw MCPs groups were 1.89 +/- 0.29, 2.07 +/- 0.39 and 1.99 +/- 0.29 mmol/L respectively, each of which was significantly lower than that in HC group (3.37 +/- 0.24 mmol/L); low-density lipoprotein cholesterol (LDL-C) levels in 1.0, 3.0, 9.0 g/kgbw MCPs groups were 0.83 +/- 0.16, 1.01 +/- 0.35 and 0.91 +/- 0.26 mmol/L respectively, each of which was significantly lower than that in HC group(2.20 +/- 0.34 mmol/L); triglyceride (TG) levels in 3.0 and 9.0 g/kgbw MCPs groups (0.90 +/- 0.15 and 0.86 +/- 0.12 mmol/L) were reduced significantly compared with that in HC group (1.18 +/- 0.18 mmol/L); MDA level in 9.0 g/kgbw MCPs group was 7.1 +/- 4.1 nmol/ml, which was significantly lower than that in HC group ( 15.9 +/- 9.9 nmol/ml); and atherogenic index (AI) in hyperlipidemic rats fed with 1.0, 3.0, 9.0 g/kgbw MCPs were 1.14 +/- 0.22, 1.16 +/- 0.27 and 0.99 +/- 0.31 respectively, each of which was significantly lower than that in HC group (2.27 +/- 0.55). The activities of SOD in 1.0, 3.0, 9.0 g/kgbw MCPs groups (218.6 +/- 33.2, 242.7 +/- 21.4 and 242.1 +/- 44.8 U/ml) were obviously increased compared with that in HC group (119.7 +/- 47.8 U/ml), and anti-atherogenic index (AAI) were also increased significantly (0.47 +/- 0.04, 0.47 +/- 0.06, 0.51 +/- 0.09 vs 0.31 +/- 0.05).

CONCLUSIONMCPs should have antioxidative and lipid-lowering effects, and might play a preventive role in hyperlipidemia and atherogenesis.

Animals ; Antioxidants ; pharmacology ; Cholesterol ; blood ; Cholesterol, LDL ; blood ; Collagen ; chemistry ; pharmacology ; Hypolipidemic Agents ; pharmacology ; Male ; Marine Biology ; Peptides ; chemistry ; pharmacology ; Rats ; Rats, Sprague-Dawley ; Superoxide Dismutase ; blood

Objective To improve the CR image quality and to promote the digital image standard constitution by analyzing the common problems and malpractiees in application of computed radiography. Methods Phenomenon and reasons of 107 CR junk-films from nine three-"A"-hospitals were analyzed, discussed,recorded,and statistised by 20 radiologists,radiographers and engineers.Results Among 107 junk fihns,there are 36 cases(33.64%)of incorrect operations,29 cases(27.10%)of artifacts in reading and transferring the data of IP,15 cases(14.02%)of artifacts in IP system,and 13 cases (12.15%)of selection of inappropriate radiographic parameters,and 9 eases(8.41%)of printer-failures, and 5 eases(4.67%)of inappropriate post-processing techniques.By analyzing the reasons of 107 junk films we found that 60.74% were due to less responsibilities and incorrect operations,and 35.51% were due to new problems in CR techniques,and other were due to inappropriate post-processing techniques. Conclusion Responsibilities,operation regulations,digital image quality standards,studying of new techniques and appropriate use of the post-processing techniques are the key points for improving the CR image quality and the diagnosis level.

OBJECTIVETo introduce a new prefabricated flap with matched colour, texture, thin enough thickness, large enough dimension and reliability for reconstruction of massive defect of face and neck.

METHODSThe patients with massive scar of face and neck were selected for treatment with prefabricated flap. Flap prefabrication involved two stages. The "sandwich" structure including the descending branch of the lateral femoral circumflex vessels and surrounding muscle fascia was harvested from the thigh and anastomosed to superior thyroid artery or facial vessels. Flap prefabrication was performed by inserting the fascia flap between the cervicothoracic skin and the tissue expander placed beneath the skin. After a period of expansion, the flap was transferred to the recipient site based on the implanted vessels. The results including complications were examined during follow-up.

RESULTSNine patients received this treatment. The average dimensions of fascia flap harvested was 6.3 cm x 11.2 cm. After mean interval of 16.7 weeks, the expanders were filled to a mean volume of 1670cc. The size of prefabricated flap ranged from 12 cm x 15 cm to 15 cm x 32 cm. In all cases, the flap efficiently covered the entire defect of the face and neck, and the donor site of the flap is closed primarily. All of the flaps developed venous congestion in some degree after the second operation. Partial flap necrosis occurred in two cases. Three flap was thinned to contour the bulky pedicle. During follow-up, the transferred flap was matched well to the adjacent skin. The reconstructed face restored nature contour and expression. Muscle weakness or paraesthesia was not found in the donor thigh.

CONCLUSIONSCervicothoracic Prefabricated Flap, is reliable and versatile in the reconstruction of massive soft tissue deficits with restoration nature surface and expression of the face and neck.

Adolescent ; Adult ; Child ; Face ; surgery ; Female ; Humans ; Male ; Middle Aged ; Neck ; Reconstructive Surgical Procedures ; methods ; Skin Transplantation ; methods ; Surgical Flaps ; Thorax ; Tissue Expansion ; Young Adult

OBJECTIVETo investigate the effect of Ulinastatin on the management of early myocardial injury and its mechanisms.

METHODSThirty-four severe burn patients with TBSA exceeding 50% were admitted into our hospital within 24 hrs after burns, and they were divided into burn group (n=17) and ulinastatin-treated group (n=17, UTI group). All patients received conventional treatment. The patients in UTI group were given 100,000 U ulinastatin intravenously immediately after admission, 3 times a day for a week. The plasma content of troponin I (cTnI) , creatine kinase (CK-MB) and PMN elastase were determined on 2, 4 and 7 postburn days (PBD), and the correlate relationship among these three indices were analyzed.

RESULTS(1) The plasma content of cTnI and PMN elastase at 2, 4, 7 PBDs were significantly higher than that of normal value (P < 0.01), but they were obviously lower in UTI group than that in burn group. (2) Compared with normal value, the plasma content of CK-MB in burn group was increased significantly on 2, 4 and 7 PBDs (P < 0.01), and it reached the peak on 4 PBD. Though it was obviously higher in UTS group on 2 and 4 PBDs compared with the normal value, but it was lower than that in burn group ( P < 0.05 or 0.01) , and it returned to normal value on 7 PBD. (3) There exhibited positive correlation among the PMN elastase content, cTnI content and CK-MB activity of the 34 patients. The correlation index of PMN elastase content and cTnI content was 0. 904, while that between cTnI content and CK-MB activity was 0.922, and that between PMN elastase content and CK-MB activity was 0.829 (P < 0.01).

CONCLUSIONUlinastatin is beneficial in alleviating myocardial injury after severe burns, and it reduces the release of PMN elastase.

Adult ; Burns ; blood ; complications ; drug therapy ; Creatine Kinase ; blood ; Female ; Glycoproteins ; therapeutic use ; Humans ; Leukocyte Elastase ; blood ; Male ; Myocardial Reperfusion Injury ; blood ; etiology ; prevention & control ; Myocardium ; metabolism ; pathology ; Troponin T ; blood