Numb,one of the important cell fate determinants,plays a key role in regulation of nerve system development,and it is closely related to the occurrence of tumors.It is proven that Numb is implicated in the processes of occurrence,invasion and metastasis of tumors through regulating the way of cell division,cell polarity,epithelial-mesenchymal transitions and several signal pathways,e.g.,Notch,Hh,p53.The expression levels of Numb in cells are related to the malignant degree and prognosis of tumors.It is vital to explore the role of Numb in tumors for treating tumors at the standpoint of Numb.

BACKGROUND: Nitric oxide synthase(NOS) is the key factor for the synthesis of nitric oxide (NO) . Because NO combines with oxygen, hemoglobin and other substances in vivo easily and deactivates quickly, and it is not exactly determined, so determining the activity of NOS is the important link for further studying the pathogenesis of NO in cerebral ischemia/reperfusion (I/R)injury.OBJECTIVE: To study the effect of different types of NOS in the process of cerebral I/R injury.DESIGN: Randomized and controlled animal experiment.SETTING: Instituteof Cerebrovascular Disease, Affiliated Hospital of Medical College of Qingdao University.MATERIALS: This experiment was carried out in the Shandong Key Laboratory of Prevention and Treatment for Encephalopathy from May to December 2005. Twenty-eight adult healthy male Wistar rats, of clean grade, weighing from 220 to 260 g, were provided by the Experimental Animal Center of Shandong University. The involved rats were randomly divided into sham-operation group (n =4) and cerebral ischemia group (n =24). Six time points were set in cerebral ischemia group: ischemia 1 hour reperfusion 6 hours, 12 hours, 1 day, 3 days, 7 days and 14 days, 4 rats at each time point.METHODS: Rat models of middle cerebral artery occlusion/reperfusion were established by suture-occluded method through inserting a suture into the left internal-external carotid artery. The expressions of different types of NOS at different time points after cerebral I/R were detected by immunohistochemical technique.MAIN OUTCOME MEASURES: ①Toluidine blue-stained two groups of nerve cells; ② The expression and distribution of neuronal NOS (nNOS), endothelial NOS (eNOS) and inducible NOS(iNOS) at different time points.RESULTS: ①Karyopyknosis and cell debris appeared in the nerve cells of the injured region of cerebral ischemia group,and there were no significant differences of cells among different time points. ② Six hours after reperfusion, the expressions of nNOS, eNOS and iNOS were found in the neurons of brain tissue and increased with the elongation of time of reperfusion. The regions in which different types of NOS in neurons of brain tissue were expressed were cortical area and corpora striata. nNOS and iNOS were highly expressed within 12 hours to 7 days after reperfusion in the brain, and eNOS was highly expressed within a short time period, i.e. 6 hours to 3 days after reperfusion. eNOS expression increasing and decreasing occurred earlier than nNOS and iNOS. But the expressions of three kinds of NOS all reached peak on the first day after reperfusion. The changing tendencies of the expression of three kinds of NOS in the cortical area and corpora striata were the same basically.CONCLUSION: After cerebral I/R injury, the high expression of eNOS occurs early and lasts for a short time, while that of nNOS and iNOS occurs late and lasts for a long time.

Community rehabilitation of cardiovascular disease is of great significance. Exercise therapy of cardiovascular disease in communities is necessary and feasible. At present, the main problems China faced to carry out community exercise therapy of cardiovascular disease include: cardiovascular patients with a weak sense of community exercise therapy, lack of professional rehabilitation personnel, inadequate community-based exercise therapy practice and lack of community rehabilitation funding. To solve above problems, we should strengthen the community exercise therapy practice of cardiovascular disease, and promote the cooperation between community rehabilitation and hospital rehabilitation. In all, comprehensive efforts should be made in order to solve the problems.

Aggregatibacter actinomycetemcomitans ; physiology ; Bacterial Adhesion ; Biofilms ; Periodontal Diseases ; microbiology ; Porphyromonas endodontalis ; physiology

OBJECTIVEThis study aims to construct a three-dimensional finite element model of a maxillary anterior teeth retraction force system in light wire technique and to investigate the difference of hydrostatic pressure and initial displacement of upper anterior teeth under different torque values of tip back bend.

METHODSA geometric three-dimensional model of the maxillary bone, including all the upper teeth, was achieved via CT scan. To construct the force model system, lingual brackets and wire were constructed by using the Solidworks. Brackets software, and wire were assembled to the teeth. ANASYS was used to calculate the hydrostatic pressure and the initial displacement of maxillary anterior teeth under different tip-back bend moments of 15, 30, 45, 60, and 75 Nmm when the class II elastic force was 0.556 N.

RESULTSHydrostatic pressure was concentrated in the root apices and cervical margin of upper anterior teeth. Distal tipping and relative intrusive displacement were observed. The hydrostatic pressure and initial displacement of upper canine were greater than in the central and lateral incisors. This hydrostatic pressure and initial intrusive displacement increased with an increase in tip-back bend moment.

CONCLUSIONLingual retraction force system of maxillary anterior teeth in light wire technique can be applied safely and controllably. The type and quantity of teeth movement can be controlled by the alteration of tip-back bend moment.

Objective To investigate the effects of lower limb training at different intensities on the recovery of walking function after stroke.Methods Thirty-six stroke patients were randomly divided into a 40-minutes of training group,an 80-minutes of training group and a 120-minutes of training group.Because of three missing followup cases,the final numbers of cases were 12,11 and 10 cases respectively.All of the patients received lower limb training based on regular rehabilitation therapy,but at the three different intensities:40 minutes,80 minutes or 120 minutes a day,five days per week,for 4 weeks.Walking function was assessed using the Holden functional ambulation categories (FACs) and the Fugl-Meyer assessment (FMA).These were carried out before treatment,and after two and four weeks of treatment.Results Before treatment,the average FACs of the three groups were (1.83 ±0.94),(1.73 ± 1.01) and (1.80 ± 1.03) respectively.Their average FMA scores were (19.17 ±5.52),(23.00±4.71) and (19.40 ±7.90).After two weeks of treatment,the average FAC in the 120-minutes training group was (3.30 ± 0.48),significantly higher than in the 40-minutes training group.After four weeks the average FACs in the 40-minutes,80-minutes and 120-minutes training groups were (2.67 ± 0.65),(3.18 ± 0.60) and (3.80 ±0.42) respectively.The differences between the 120-minutes group and the 80-minutes group as well as between the 80-minutes group and the 40-minutes training group were statistically significant.The average FMA scores of the three groups after four weeks were (25.08±4.46),(28.64±3.56) and (25.90±5.19) respectively.All the differences were significant compared with pre-treatment.There were no significant differences in FMA scores among the three groups after two weeks or four weeks of treatment.Before treatment,the proportion of patients able to walk independently in the 40-minutes,80-minutes and 120-minutes training groups were 16.7％,18.2％ and 20.0％.After two weeks the proportions had risen to 33.3％,36.4％ and 100％ respectively,so the results in the 120-minutes training group were significantly better.After four weeks of treatment the proportions of the three groups were 58.3％,90.9％ and 100％.All these improvements were significant compared with pre-treatment,but when compared with the 80-minutes training group,neither of the others showed a significant difference.Conclusions Intensive training can accelerate the recovery of walking function of patients after stroke and promote their ability to participate in daily activities.

Objective To observe the effect of daidzein on extracellular matrix of uremic rats and to discuss its mechanism.Methods Uremic rat model were established by 5/6 nephrectomized. Model rats were devided into daidzein group, control group. Rats with sham-operation were regarded as the normal control. At time of baseline, 4th and 8th week after operation, urinary protein and biochemical detection were measured. The pathologic changes, fibronectin (FN) and typeⅣcollagen (ColⅣ) were investigated at 8th week. The Western-Blot and RT-PCR were used to measure protein expression and mRNA transcription of TGF-β1. Results At 8th week after operation, the urinary protein (12.35 ± 2.13 mg/24 hvs. 19.93 ± 3.19 mg/24 h), serum urea (10.11 ± 0.65 mmol/Lvs.12.09 ± 0.78 mmol/L) and creatinine (68.10 ± 2.51μmol/Lvs.77.63 ± 3.20μmol/L) in the daidzein group decreased significantly than those in the control group (P<0.01). The deposition of ColⅣ (16.33% ± 2.14%vs. 24.68% ± 3.97%) and FN (19.17 ± 2.68 vs. 29.35 ± 4.15) in the daidzein group decreased significantly than those in the control group (P<0.01). Compared with control group, the pathological lesion in the daidzein group was less serious. The mRNA transcription (0.37 ± 0.06vs. 0.64 ± 0.08) and protein expression of TGF-β1 (0.28 ± 0.09vs. 1.40 ± 0.13) in the daidzein group were attenuated significantly than those in the control group (P<0.05). ConclusionsDaidzein had a beneficial effect on uremic rats. It may be associated with a decrease of extracellular matrix accumulation.

Objective To investigate the effect of genistein on deposition of extracellular matrix(ECM) in uremic rats and its mechanism.Methods The uremic rat model was established by 5/6 nephrectomy.The model rats were divided into the genistein group(G) and control group (C).The sham-operation group served as the normal control(S).Urinary protein and biochemical indexes before operation,at postoperative 4,8 weeks were measured in various groups.The pathologic changes of renal tissue were observed.The glomerular sclerosis index(GSI) was evaluated by the semi-quantitative method.fibronectin(FN) and type Ⅳ collagen (ColⅣ) deposition situation were detected by using the immunohistochemical method.Western blot and RT-PCR were used to measure the protein expression and mRNA transcription of TGF-β1.Results Comparing postoperative 4 weeks with the group C,the urinary protein excretion amount was decreased[(11.63 ± 2.07) mg/d vs.(19.93 ± 3.19) mg/d,all P＜ 0.01],serum urea nitrogen and creatinine levels of the group G were decreased[(9.39±0.59)mmol/L vs.(12.09±0.78)mmol/L,(65.11±3.79)mmol/L vs.(77.63±3.20)μmol/L,all P＜0.01].Until postoperative 8 weeks,the urinary protein excretion amount was decreased and the decrease of serum urea nitrogen and creatinine levels was more obvious.The deposition of ColⅣ and FN in renal glomerulus was lower than that of the control group[(17.30±1.96)％ vs.(24.68±3.97)％;(18.26±2.31)％ vs.(29.35±4.15)％,all P＜ 0.01].Glomerular sclerosis was significantly alleviated.The TGF-β1mRNA and protein expression were attenuated (P＜0.05).Conclusion Genistein can reduce the deposition of ECM in uremic rats and has a protective effect on kidney.

Objective:Three-dimensional (3D) ultrasound (US) is increasingly being introduced in the clinic,both for diagnostics and image guidance.Although dedicated 3D US probes exist,because of its expensive cost,3D US can also be acquired with the still frequently used two-dimensional (2D) US probes.Methods:Obtaining 3D volumes with 2D US probes is a two-step process.First,a positioning sensor must be attached to the probe for 2D image matching;second,a reconstruction of a 3D volume can be performed into a regular voxel grid.Results:This paper presents a way to realize the 3D US in irled-based Image Guided Radiotherapy using a homemade 2D US.Conclusions:The experiments demonstrate a method of saving costs and having advantages in clinic application.

OBJECTIVE:To explore the effect of nifedipine combined with losartan on the blood pressure and renal function of hypertension complicated with coronary heart disease. METHODS:150 patients with hypertension complicated with coronary heart disease were randomly divided into observation group and control group. Control group was orally treated with Nifedipine sustained release tablet 30 mg,once a day;observation group was additionally treated with Losartan potassium capsules 50 mg,once a day. The treatment course for both groups was 1 month. Systolic blood pressure,diastolic blood pressure,renal function indicators be-fore and after treatment,and incidence of adverse reactions in 2 groups were observed. RESULTS:After treatment,systolic blood pressure and diastolic blood pressure after 3 months was lower than 1 month and lower than before treatment in same group,renal function indicators were significantly lower than before treatment,and observation group was lower than control group,the differ-ences were statistically significant(P<0.05);the incidence of adverse reactions in observation group was significantly lower than control group,the difference was statistically significant(P<0.05). CONCLUSIONS:Nifedipine combined with losartan can well control the blood pressure of hypertension complicated with coronary heart disease,protect renal functions,with good safety.