OBJECTIVETo explore the effects of methylglyoxal on endothelia cell migration.

METHODSHuman umbilical vein endothelial cells (HUVECs) were stimulated by serial concentrations of methylglyoxal (MGO, 0, 25, 50, 100 and 200 µmol/L) for 24 h, and the cell migration was assessed by scratch wound and Transwell assay. The expression of integrin β3 in the treated cells was examined by immunoblotting, and the effect of an anti-β3 antibody, LM609, on cell migration was investigated.

RESULTSMethylglyoxal significantly inhibited HUVEC migration in a concentration-dependent manner (P<0.05). Methylglyoxal decreased the expression of integrin β3 in a time- and concentration-dependent manner (P<0.05). LM609 also significantly inhibited HUVEC migration (P<0.05).

CONCLUSIONMethylglyoxal inhibits HUVEC migration in vitro by down-regulating integrin β3 expression.

Cell Movement ; drug effects ; Cells, Cultured ; Down-Regulation ; Human Umbilical Vein Endothelial Cells ; drug effects ; metabolism ; Humans ; Integrin beta3 ; metabolism ; Pyruvaldehyde ; pharmacology

Objective To compare the relative dose of small fields measured by clinically common detectors and those obtained from Monte Carlo simulation in order to obtain the accurate measurement method, and to modify the inappropriate detectors.Methods The percentage depth-dose distribution curve and profile (flatness and symmetry) curves were collected at 2 cm×2 cm, 3 cm×3 cm, and 4 cm×4 cm under 6-MV X-ray of Trilogy linear accelerator by CC13, PFD, SFD, and blue phantom.The results were compared with the stimulation results from Monte Carlo method (the current gold standard).The correction factors for the detectors with large error were calculated to provide reference data for clinical practice.Results The results measured by SFD detector were most close to the results from Monte Carlo simulation.The measurement errors of CC13 and PFD detectors were large.The correction factor in the penumbra for CC13 and PFD detector was 0.664-1.499.Conclusions SFD detector is better than CC13 and PFD detector in the measurement of small fields, but CC13 and PFD detector can provide reference data for clinical practice after the corresponding correction.

Objective To observe the gastric changes in adult male Sprague-Dawly (SD) rats irradiated by the single large dose electron beam,providing animal experimental evidence for intraoperative radiotherapy for gastric cancer.Methods Thirty-eight SD rats were randomly divided into the control and experimental groups.The stomach of the rats in the experimental group were subject to single 6 MeV 20 Gy irridiation by using the patent technology of Accurate Irradiation Experiment Table for Small Animal Radiation.The general conditions,gastric injury and body weight change were observed at different days following irradiation.Results The most severe gastric damage of rats was observed on the 14th d after irradiation.The gastric injury was gradually repaired accompanied with glandular atrophy at 28 d postirradiation,and the gastric injury was manifested as cellulose fibrinous repair on the 56th d after irradiation.Within 1 week post-irradiation,weight loss was noted in the experimental group,which significantly differed from the rats in the control group (P＜0.05).During the 2nd week,the body weight was increased in the experimental group,significantly lower compared with the rats in the control group (P＜ 0.05).The body weight of rats did not significantly differ between two groups at 6 weeks after irradiation (P＞ 0.05).Conclusions The most severe gastric injury is observed at 2 weeks after the single-dose 6 MeV electron beam 20 Gy irradiation,whereas no gastric perforation occurs.The gastric injury can be restored to normal status within 8 weeks following irradiation.

OBJECTIVETo assess the feasibility and effectiveness of transarterial embolization for management of acute massive hemorrhage in patients with duodenal ulcer.

METHODSTwenty-two patients with duodenal ulcer underwent transarterial embolization for acute massive hemorrhage in our hospital between January 2007 and December 2012. Embolic agents were coils and gelatin sponge. The clinical data and embolization procedures of these patients were retrospective analyzed.

RESULTSBleeding was controlled in 20 of 23 patients after the first embolization procedures. In the other 3 patients with rebleeding, one patient was successfully managed by repeat embolization and two patient underwent surgical treatment. The overall clinical success rate for acute hemorrhage after transarterial embolization was 91% (21/23). No severe complication occurred.

CONCLUSIONTransarterial embolization is safe and effective for acute massive hemorrhage in patients with duodenal ulcer.

Adult ; Aged ; Duodenal Ulcer ; complications ; Embolization, Therapeutic ; methods ; Female ; Gastrointestinal Hemorrhage ; etiology ; therapy ; Humans ; Male ; Middle Aged ; Retrospective Studies ; Treatment Outcome

OBJECTIVE: To quantify the relationship between cerebral blood flow velocity and peripheral blood pressure during hypotension period, aiming to predict the brain hypotension before symptomatic occurrence. METHODS: Twenty vasovagal syncope (VVS) patients who had a previous clinical history were selected in groups and 20 pair-matched control subjects underwent 70° tilt-up test. The subjects remained supine for 30 minutes before recordings when Doppler probes, electrodes and Finapres device were prepared. After continuous baseline recordings for 10 min, the subjects underwent head up tilt (HUT) test (70°), and were standing upright for 30 minutes or until syncope was imminent. For ethical reasons, the subjects were turned back to supine position immediately after SBP dropped to ≥20 mmHg, when their consciousness persisted. The point of syncope was synchronized for all the subjects by the point SBP reached the minima. Their beat-to-beat blood pressures (BP) were recorded continuously and bilateral middle cerebral artery (MCA) flow velocities were obtained with two 2 MHz Doppler probes from a transcranial Doppler ultrasonography (TCD) system. A nonlinear dynamic method--multimodal pressure flow (MMPF) analysis was introduced to access cerebral autoregulation during different time intervals. We introduced a new indicator--syncope index (SI), which was extracted from blood flow velocity (BFV) signal to evaluate the variation of cerebral vascular tension, and could reflect the deepness of dicrotic notch in BFV signal. RESULTS: Compared with the syncope index of the baseline value at the beginning of the tilt test, SI in VVS group showed significantly lower when the VVS occurred (0.16±0.10 vs.0.27±0.10,P<0.01),while there was no significant difference in syncope index between the control group at the end of the tilt test and the baseline value at the beginning of the tilt test. For those VVS patients, pulse index and resistance index had no significant change. Syncope index decreased significantly 3 minutes before the point of syncope (0.23±0.07 vs.0.29±0.07,P<0.01). CONCLUSION Dynamic regulation is exhausted when vasovagal syncope occurred. Tension decrease of small vessels could have some relationship with loss of the cerebral autoregulation capability. The proposed syncope index could be a useful parameter in predicting syncope of VVS patients since it decreased significantly up to 3 minutes earlier from the point of syncope.
Blood Pressure ; Heart Rate ; Humans ; Nonlinear Dynamics ; Syncope ; Syncope, Vasovagal ; Tilt-Table Test

N6-Methyladenosine (m⁶A) is the most abundant internal modification in eukaryotic mRNA, playing critical role in various bioprocesses. Like other epigenetic modifications, m⁶A modification can be catalyzed by the methyltransferase complex and erased dynamically to maintain cells homeostasis. Up to now, only two m⁶A demethylases have been reported, fat mass and obesity-associated protein (FTO) and alkylation protein AlkB homolog 5 (ALKBH5), involving in a wide range of mRNA biological progress, including mRNA shearing, export, metabolism and stability. Furthermore, they participate in many significantly biological signaling pathway, and contribute to the progress and development of cancer along with other diseases. In this review, we focus on the studies about structure, inhibitors development and biological function of FTO and ALKBH5.