Homeobox gene Six1,as a transcription factor has been proved to participate in most malignant tumors.Its overexpression is associated with the genesis and development of breast cancer intimately.Overexpression of Six1 in mammary cells is sufficient to induce activation of stem cells.Similarly,Six1-overexpressed tumors could activate the TGF-β pathway and Wnt/β-catenin pathway,lead to malignant transformation by inducing epithelial-mesenchymal transition and mammary tumorigenesis.Research on the role of sixl will improve understanding the mechanisms of breast cancer initiation and development.

Aim To determine whether there existed melatonin receptor (MR) in adult hepatoma tissue and to observe its property of binding.Methods Immuno-histochemistry was used to detect MR and identify its subcellular distribution. Specific binding and kinetic analyses of melatonin receptor were measured by radioligand binding assay.Results The results of immunohistochemistry showed that MT1 and MT2 existed in membrane, cytosol and nucleus of the hepatoma cells, but the expression of them principally localized in the membrane and cytosol. The specific binding assay properties of MR were presented as follows: the maximum binding capacity (B_(max)) was (0.29±0.07) pmol·g~(-1) protein. Equilibrium dissociation constant (K_d) was (48.7±6.5) pmol·L~(-1). The trait of MR, saturation and reversibility, was detected by ~(125)I-Mel specific binding kinetic analyses.Conclusions MR exists in adult hepatoma cells, furthermore, the subtypes of MR (MT1 and MT2) coexist in the membrane and cytosol, respectively,whose characters of the specific binding sites were low binding capacity,high affinity,saturation and reversibility.

Several transplantation strategies have made some advance in promoting axonal regeneration and partial functional recovery in animal models of spinal cord injury and in some clinical trials.This article reviews the transplants used in recent laboratory studies and phase 1 clinical trials,introduces their application condition and mechanism of action,etc.

BACKGROUND:Polyester fabric as a common clinical consumable item is characterized by simple drawing, low cost, and high toughness and ductility, and can serve as a good repair material. OBJECTIVE:To investigate the clinical efficacy of polyester fabrics used for huge chest wal repair. METHODS: Totaly 46 patients with chest wal tumors, aged 39-73 years, including 29 males and 17 females. These patients were randomly and equaly divided into observation group and control group. After the removal of chest wal tumors, patients in the observation group underwent polyester fabric repair of huge chest wal defects, and those in the control group were treated with autologous pedicle flap for repair of huge chest wal defects. The clinical efficacy and patient satisfaction were recorded in the two groups. RESULTS AND CONCLUSION: After treatment, al the patients could feel up to their daily work, and there were no death and serious complications. Only two cases developed postoperative local effusion, and then recovered after wound drainage. Thoracic appearance was good in al patients, and the patients did not feel discomfort at the reconstruction site during breathing and movement. At the end of 6-24 months of folow-up, X-ray review showed good reconstruction of the thorax, and there were no loose transplants, foreign body rejection, chest wal deformity, recurrence and serious complications. Clinical efficacy and patient satisfaction were better in theobservation group than the control group (P < 0.05). These results show that polyester fabrics for the repair of huge chest wal defects are effectively, safe and reliable.

Objective To discuss the effect of growth hormone(GH) on acute gastric mucosal lesion(AGML) in rats.Methods 120 Wistar rats were divided into four groups randomly: blank control group(n=8),simple model group(n=32),model+rhGH group(n=40) and model+cimetidine group(n=40).Animal models of AGML were set up through soak and tie of rats.GH was injected to the rats in experimental groups,while cimetidine was used in the positive control group.Morphologic changes of rat gastric mucosa in each group were observed and compared on different days(0,4,8,12 d) after stress through gross looking,light microscope,and electron microscope.Ulcer index(UI),secretion amount of gastric acid,pH value and gastric mucosal were compared.Results Compared with blank control and model+cimetidine groups,the histomorphologic changes of gastric mucosa were obviously alleviated in model+rhGH group: only part of epithelial cells swelled,red blood cells were seldom seen,neutrophils infiltration reduced obviously,no remarkable changes were observed in the submucosal tissue.Mucosal cells were in good state and degeneration were seen in only a few cells under the electronic microscope.In addition,UI and the degree of gastric mucosal atrophy in model+rhGH group were lower than that in control group significantly(P

Objective To explore the changes of rabbit adipose stem cells(ASCs)and bone mesenchymal stem cells(BMSCs)cultured in vitro and the anabolism under basic fibroblast growth factor(bFGF).Methods BMSCs and ASCs were cultured with DMEM,DMEM/F12(2∶1)or α-MEM respectively.The 3rd generation ASCs and BMSCs were divided into 2 groups respectively:group A:ASCs cultured in chondrogenic medium(CM),group B:ASCs cultured in CM supplemented with bFGF 5 ng/ml,group C:BMSCs cultured in CM,group D:BMSCs cultured in CM supplemented with bFGF 5 ng/ml.Morphological changes were observed under inverted microscope.The 35SO42-incorporation and total hydroxyproline were measured.Results BMSCs and ASCs showed much higher growth rate when cultured in α-MEM medium comparison with that in DMEM or in DMEM/F12(2:1).Both stem cells attachment cultured in monolayer greatly increased and cell clones were abundant,while the cells attachment became rather difficult and cell clones were less after cutured in CM.All stem cells possessed a round-like morphology,and the cells in group B and D were more than that in the other 2 groups.The 35SO42-incorporation and total hydroxyproline synthesis of group B or D increased compared with that of group A or C,but there was no diference between group D and B.Conclusion The rabbit ASCs and BMSCs cultured in CM suppling with bFGF grow well and their metabolism increased.

Objective: To observe the cholagogic effect of Danning Tablet. Methods: We determined the gallbladder contractibility, the bile flow volume and the tensity of Oddis sphincte of rabbit. Results: Danning Tablet could increase the frequence and extent of the gallbladder contractibility and the bile flow volume, it also relaxed Oddis sphincte ( P

2-Keto-L-gulonic acid (2-KLG), the precurcor of L-ascorbic acid synthesis, was prepared directly from D-glucose by tandem fermentation. In the first step fermentation Erwinia sp. SCB 247 translated D-glucose to 2,5-diketo-D-gluconate (2,5-DKG), which accumenlated 180 mg 2,5-DKG per ml in the broth. In the second step fermentation Corynebacterium sp. SCB 3058 reduced 2,5-DKG to 2-KLG, which accumulated 35 mg 2-KLG per ml in the broth. This reductive fermentation was obtained under aerobic conditions by adding a hydrogen donor such as glucose.The average yield of five batches fermentation was 56.3 mol%, from D-glucose to 2-KLG in 10 L fermentor.

Objective To evaluate the feasibility of intra-operative ultrasound guide in breast conservative-surgery and its effect on positive margin rate and breast tissue volume.Methods Fifty-five cases of invasive breast cancer staged T1-2N0-1 were randomly assigned to palpation-guided group(control group) 26 cases and ultrasound-guided group(experiment group) 29 cases.Before and during operation,high-frequency ultrasound was used to guide the resection of breast cancer with 1 cm margin in experiment group.The resection margin positive rate deteced by tissue section frozen biopsy and resected breast tissue volume were compared between experiment and control group.Results The clinicopathologic features were accordant between two groups.The margin positive rate and near-margin positive rate in experiment group were 0 and 3.45％ respectively,slightly lower than that of control group 3.85％ and 15.38％,but with no statistical significance (P ＞ 0.05).The same situation occurred at the re-exision rate.The resected breast tissue volume in experiment group (32.40 ± 10.93) cm3 was lower than that of control group (55.11 ± 12.88) cm3,and with statistical significance (P ＜ 0.01).Conclusions Intra-operative ultrasound guide could reduce the margin positive rate and unnecessary resected brcast tissue volume in breast conservative-surgery,and improve cosmetic effect.

Objective To investigate the role of large-conductance Ga2+-activated K+ (BKCa) channels and protein kinase G (PKG) in ketamine-induced isolated tracheal smooth muscle relaxation in rats with asthma.Methods Healthy Sprague-Dawley rats,weighing 250-300 g,were used in this study.Asthma was induced with egg albumin.Thirty-six tracheal rings of 15 rats in which asthma model was successfully established were randomly divided into 3 groups (n =12 each):ketamine treatment group (group AK),IBTX (BKCa channel blocker) +ketamine treatment group (group AKI),and KT-58232 (PKG inhibitor) + ketamine treatment group (group AKK).Tracheal rings were suspended in an organ bath filled with oxygenated Kreb's solution at 36.5-37.5 ℃.In group AK,the tracheal rings were precontracted with acetyleholine 0.1 mmol/L,and the rings were then exposed to ketamine 0.4 g/L for 15 min.In group AKI,before acetyleholine and ketamine were added to the solution,the rings were pretreated with IBTX 3μmol/L for 30 min.In group AKK,before acetyleholine and ketamine were added to the solution,the rings were pretreated with KT-5823 2μmol/L for 30 min.The tension of rings was measured by using a force-displacement transducer.Results The amplitude of relaxation of isolated tracheal smooth muscle was significantly decreased in groups AKI and AKK as compared with group AK (P ＜ 0.05).Conclusion Ketamine induces isolated tracheal smooth muscle relaxation through activating BKCa channels and PKG signaling pathway in rats with asthma.