Objective To study that Geranylgeranylacetone(GA) induce the expression of heat shock protein 70 expression in hippocampus of Alzheimer's model rats and its effect on learning and memory ability in the model rats induced by Aβ1-42 injection into hippocampus.Method 72 health SD rats were randomly divided into GGA group,model group was injected with Aβ1-42 and control group was injected with normal saline into hippocampus.Y maze test was used to detect the learning and memory ability of the rats at the 7th,14th and 21st day after injection into hippocampus separately.HSP70 expression in hippocampus tissues were detected by RT-PCR and western-blot as soon as Y maze test has been finished.Result The learning and memory ability of the rats in model group decreased significantly at the 14th and 21st day after injection than those in control group(P<0.05),but not too much changed in GGA group(P<0.05).HSP70 expres- sions in hippocampus tissues in model group decreased gradually after injection Aβ1-42,but increased in GGA group at the 7th,14th and 21st day after injection.Conclusion GGA can induce the expression of HSP70 in hippocarnpus of Alzheimer's model rats and meliorate the neuron impairment as well as the learning and memory ability of the rats.

Objective To observe the effects of the topical benzalkonium chloride on the cornea of experi-ment animals and evaluate the safety of topical benzalkonium chloride.Methods 36 rabbits were randomly divided into two groups according to the random number table,18 rabbits(36 eyes)in each group.The benzalkonium group was assigned as preservative benzalkonium chloride(0.05%)gutta,the control group was served as blank control. Rabbits were examined by the slit lamp,non-contact corneal endothelial microscope and Ultrasonic Wave instrument for corneal endothelial cell density and corneal thickness before and the 3rd weeks,the 6th weeks after the medica-tion.In vitro cornea was stained by typan blue and alizarin red,corneal endothelial cells were observed and calculate the viability of corneal endothelial cells (CECs).Results The differences of corneal thickness at the 3rd weeks and the 6th weeks were not statistically significant between the two groups(t =1.876,1.876,all P >0.05);The differ-ences of the corneal endothelial cell density and the viability of corneal endothelial cells(CECs)between the two groups at the 3rd weeks and the 6th weeks were not statistically significant(t =0.321,1.541,all P >0.05);The tear meniscus height of the benzalkonium group were lower than the control group at the 6th weeks[(142 ±36)μm vs. (198 ±31)μm,t =2.462,P <0.05].Conclusion Benzalkonium chloride has no impact on the corneal endothelial cells in short period,but the affection on the tear is obvious.

Objective To evaluate the efficacy of discriminant function analysis for pericolic infiltration in colorectal cancer on enhanced 64-slice spiral CT and to improve the diagnostic accuracy and specificity of pericolic infiltration. Methods Dynamic enhanced 64-slice spiral CT was performed in 49 colorectal cancer patients (49 masses in total) before surgery. One or two slices were selected for each mass, with a total of 96 slices. The 96 slices were classified into two groups (pericolic infiltration or nonpericolic infiltration group) according to pathological data. Discriminant analysis was performed on the CT values between the mass and the corresponding pericolic tissue 5 mm from the mass at different time points as follows; 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, and 75 s. The discriminant function was calculated, and the pericolic infiltration determined by discriminant function and CT morphology were compared with the pathological results. The CT values in pericolic and non-pericolic infiltration groups at different enhancement time points were assessed using analysis of variance. Results The mean CT values ranged from (43. 6 ±7. 8) HU to (52. 3 ±0. 8) HU in the pericolic infiltration group, and ranged from (100.4±20.3)HU to(116.2±21.4)HU in the non.perieolic infiltration group.At 20 s and 40 s,the mean CT vshle8 were(43.6±27.8)HU and(50.9±27.8)HU in the perleolic infiltration group, (102.0±16.9)HU and(116.2 ±21.4)HU in the non-perieolic infiltration group,respectively.The mean CT value in the pericolic infiltration group was significantly lower than that in the non-pericolic infiltration group at all contrast enhancement time points(F=6.278,P<0.01).A diseriminant function Was obtained as follows:D=-3.450+0.023Xl±0.017X2-0.00lX12-0.001X22+0.002X1×X2. Based on the CT morphology of colorectal cancer,69 slices were identified correctly and 27 slices were fulsely interpreted.the sensitivity.speeificity and accuracy for perieolic infiltration determination were 82.5%,64.3%and 71.9%.respectively.Based on diseriminant function,85 slices were identified correctly and 11 slices were falsely interpreted.the sensitivity,specificity and accuracy were 85.0%.91.1%and 88.5%,respectively.Conclusion The discriminant function with dynamic enhanced 64-slice spiral CT can improve the diagnostic accuracy and specificity of perieolic infiltration in eolorectal cancer patients.

Objective To explore the expression of vascular endothelial growth factor (VEGF)mRNA and protein in endothelia progenitor cells (EPCs) and VEGF in the culture medium and serum of patients during acute period of cerebral hemorrhage associated with hypertension (APCHH). Methods Mononuclear cells from peripheral blood of patients with APCHH ( 16 patients) and hypertension ( 16 patients) were isolated and induced to EPCs. Semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) analysis was performed to assay VEGF mRNA. VEGF protein was assessed by Western blotting. The VEGF protein level in patient's serum and culture medium ( at day 7 ) were assayed using VEGF ELISA Kit and compared between APCHH group and hypertension group. Results Compared with hypertension group, VEGF mRNA (0. 186 ±0. 035 versus 0.090 ±0.031, t =8.318, P ＜0.0l ) and protein (0. 223 ± 0. 028 versus 0.169 ± 0. 022, t = 3. 744, P ＜ 0. 01 ) expression of EPCs, the concentration of VEGF protein in the supernatant (414 ±37 versus 316 ±29, t =8. 270, P ＜0. 01 ) and in serum (408 ±49versus 222 ±34, t = 12.406, P ＜0. 01 ) were all significantly increased in APCHH group. Conclusion The VEGF protein levels in serum of patients and in the culture medium, VEGF mRNA and protein expression in EPCs were all significantly increased during acute periods of cerebral hemorrhage.

AIM To study the effects of Rehmanniae Radix Preparata (A) and Poria (B) on decoction amounts of loganin,morroniside and 5-hydroxymethylfurfural in Corni Fructus (C).METHODS These three medicinal materials were combined one another and divided into seven groups (A,B,C,A + B,A + C,B + C and A + B + C).Then the contents of three constituents were determined by HPLC.RESULTS Compared with the single decoction of Corni Fructus,the decoction amounts of loganin and 5-hydroxymethylfurfural were decreased,and that of morroniside was increased at the time of mixed decoction of Rehmanniae Radix Preparata and Corni Fructus,or Rehmanniae Radix Preparata,Poria and Corni Fructus.This situation was just the contrary at the time of mixed decoction of Poria and Corni Fructus.CONCLUSION The mixed decoction of Corni Fructus,Rehmanniae Radix Preparata and Poria increases the decoction amount of morroniside,which may make mixed decoction liquid show better efficacy.

OBJECTIVE:To study the effects of combined decoctions of alismatis rhizoma and curcumae radix and rehmanniae radix praeparata on the decoction amount of acteoside in rehmanniae radix praeparata,and provide reference for studying the effec-tive ingredients of three-drug effect. METHODS:Single decoction-1(rehmanniae radix praeparata 20 g),single decoction-2(alis-matis rhizoma 20 g),single decoction-3(curcumae radix 20 g),combined decoction-1(rehmanniae radix praeparata 20 g,alisma-tis rhizoma 20 g),combined decoction-2(rehmanniae radix praeparata 20 g,curcumae radix 20 g),combined decoction-3(alisma-tis rhizoma 20 g,curcumae radix 20 g)and combined decoction-4(rehmanniae radix praeparata 20 g,alismatis rhizoma 20 g,cur-cumae radix 20 g)were respectively taken to prepare dry extracts after extracting by refluxing,HPLC was used to detect the acteo-side content and calculate its decoction amount in sample. RESULTS:The decoction amounts of acteoside in single decoction-1, combined decoction-1,combined decoction-2 and combined decoction-4 dry extracts were 0.0354,0.0223,0.0228,0.0110 mg/g,respectively. Compared with single decoction-1 group,the last 3 groups had statistical significances(P<0.01);combined decoc-tion-4 showed lowest decoction amount in three-drug combined decoction group. Acteoside was not detected in the negative control groups(single decoction-2,single decoction-3 and combined decoction-3). CONCLUSIONS:The decoction amount of acteoside is reduced when alismatis rhizoma,curcumae radix and rehmanniae radix praeparata were decocted together,indicating that it may not be the main ingredient of playing effects in three-drug combined decoction liquid.

BACKGROUND:To dynamicaly monitor the varying levels of inflammatory factors in the gingival crevicular fluid is helpful to assess the early effect of orthodontic tooth movement. Myeloperoxidase, soluble intercelular adhesion molecule-1, pentraxin 3 are proven to be closely related to inflammation, but it is unclear about the levels of these three kinds of inflammatory factors as wel as association of these three kinds of inflammatory factors with orthodontic tooth. OBJECTIVE:To detect the expression levels of myeloperoxidase, soluble intercelular adhesion molecule-1 and pentraxin-3 in the gingival crevicular fluid during maxilary canine distal movement and to assess their correlation with periodontal disease, canine movement distance and orthodontic force. METHODS:Twenty-one orthodontic patients were enroled and assigned into 150 g (n=12) or 100 g (n=9) groups according to orthodontic force. The gingival crevicular fluid samples of orthodontic patients were colected before and at 4, 12, 24 hours, 7, 14 days after maxilary canine distal movement. Levels of myeloperoxidase, soluble intercelular adhesion molecule-1 and pentraxin-3 in the gingival crevicular fluid were measured and analyzed using ELISA assay. RESULTS AND CONCLUSION: During the distal movement of maxilary canine, under orthodontic force, the level of myeloperoxidase was peaked at 4 hours and then decreased, while the expression level of soluble intercelular adhesion molecule-1 was peaked at 12 hours, and then decreased. Both myeloperoxidase and soluble intercelular adhesion molecule-1 levels returned to normal at 7 days under orthodontic force. The expression level of pentraxin-3 was increased significantly under orthodontic force, peaked at 24 hours, and then decreased gradualy to the normal level at 7 days. In addition, the expression levels of myeloperoxidase, soluble intercelular adhesion molecule-1 and pentraxin-3 in the gingival crevicular fluid were significantly higher under 150 g force than under 100 g force. These findings indicate that detecting varying levels of myeloperoxidase, soluble intercelular adhesion molecule-1 and pentraxin-3 in the gingival crevicular fluid is useful to assess the efficiency of orthodontic treatment and prevent adverse reactions.

Objective To investgate risk factors of delayed bleeding after endoscopic submucosal dissec-tion(ESD)for early colorectal tumor and precancerrous lesions. Methods We retrospectively reviewed clinical date of 138 patients with early colorectal tumor and precancerrous lesions who received ESD in Hubei Cancer Hos-pital from October 2012 to October 2016. Risk factors of delayed bleeding were analysed by univariate and multi-variable logistic regression analysis. Results Ten(7.2%)of 138 patients occurred delayed bleeding after ESD. Univariate analysis showed that there was significent difference between the bleeding group and the non-bleeding group in location of the lesion(P = 0.022),severe fibrosis of submucosa(P = 0.016),Obvious intraoperative bleeding(P = 0.032)and inadequate endosopic experience of endoscopist(P = 0.045). Multivariate Logistic re-gression analysis showed that location of lesion(P = 0.003,OR = 4.64,95%CI:1.71~12.58),severe fibrosis of submucosa(P = 0.009,OR = 4.83,95% CI:1.49~15.60)were independent risk factors of delayed bleeding after ESD for early colorectal tumor and precancerrous lesions. Conclusion Patients with early colorectal tumor and precancerrous lesions in the rectum and severe fibrosis of submucosa are prone to delayed bleeding after ESD.

Objective:To explore the values of albumin-bilirubin (ALBI) score, carcinoembryonic antigen (CEA) and combination of the two in the prognostic assessment of colorectal cancer patients with postoperative liver metastasis.Methods:The clinicopathological data of 98 colorectal cancer patients with postoperative liver metastasis who were admitted to Lianyungang Oriental Hospital and receiving adjuvant chemotherapy from January 2016 to March 2020 were retrospective analyzed. The data of serum protein, bilirubin, and CEA before chemotherapy were obtained, the relationship between serum protein and bilirubin was analyzed, and the ALBI score was calculated. The ALBI-CEA score was judged according to the ALBI score and the CEA level. ALBI score > -2.60 points was categorized as high ALBI group, and ALBI score ≤ -2.60 points was categorized as low ALBI group; CEA >5 ng/ml was categorized as high CEA group, and CEA ≤5 ng/ml was categorized as low CEA group; patients were categorized into 0, 1, and 2 points groups based on ALBI-CEA score. Overall survival (OS) and progression-free survival (PFS) of ALBI score, CEA and ALBI-CEA score subgroups were analyzed by Kaplan-Meier method; with the actual survival and progress status of the patients as the gold standard, receiver operating characteristic (ROC) curve was used to analyze the effect of 3 indicators to assess patients' OS and PFS, and area under the curve (AUC) was compared; Cox proportional hazards model was used to analyze the influencing factors of OS and PFS.Results:The median albumin and bilirubin levels of the 98 patients were 34.4 g/L (26.8-42.8 g/L) and 16.6 μmol/L (7.6-44.6 μmol/L), and the result of Pearson correlation analysis showed a negative correlation between the levels of albumin and bilirubin ( r = -0.282, P < 0.001). The 3-year OS and PFS rates in the high ALBI group were lower than those in the low ALBI group (OS rate: 9.2% vs. 33.3%, PFS rate: 7.7% vs. 18.2%), and the differences in OS and PFS between the two groups were statistically significant ( χ2 values were 27.64, 23.30, both P < 0.001). The 3-year OS and PFS rates in the high CEA group were lower than those in the low CEA group (OS rate: 7.1% vs. 42.9%, PFS rate: 7.1% vs. 21.4%), and the differences in OS and PFS between the two groups were statistically significant ( χ2 values were 23.71, 17.14, both P < 0.001). The 3-year OS rates in the ALBI-CEA score 0, 1 and 2 points groups were 77.8%, 20.9% and 2.2%, and the 3-year PFS rates were 44.4%, 9.3% and 6.5%, and there were statistical differences in OS and PFS among the three groups ( χ2 values were 102.36, 76.55, both P < 0.001). The ROC curve analysis showed that the AUC of ALBI score, CEA and ALBI-CEA score for assessing OS were 0.688 (95% CI 0.544-0.832), 0.754 (95% CI 0.618-0.890) and 0.828 (95% CI 0.723-0.933) (all P < 0.05), and the AUC for assessing PFS were 0.618 (95% CI 0.436-0.799), 0.646 (95% CI 0.464-0.829) and 0.682 (95% CI 0.494-0.870) (all P > 0.05). Multivariate Cox regression analysis showed that ALBI-CEA score was an independent influencing factor for OS (2 points vs. 0 point: HR = 17.254, 95% CI 8.385-35.504, P < 0.001) and PFS (2 points vs. 0 point: HR = 6.144, 95% CI 3.725-10.134, P < 0.001) of patients. Conclusions:The colorectal cancer patients with liver metastasis and high ALBI-CEA score are at high risk of death and disease progression and have a poor prognosis, and they are recommended to receive intensive treatment.

Objective:Given the indispensable role played by medical ethics committees in protecting the rights and interests of subjects and researchers, such committees in China are found with weak organizational capacity. This study was designed to analyze the driving factors to improve their organizational capacity.Methods:Form July to September 2020, a survey and interview of 71 tertiary A hospitals in eastern China were conducd, and a total 60 valid samples were obtained. Through crisp-se qualitative comparative analysis(csQCA), the medical ethics committees of 60 tertiary hospitals were analyzed, and the factors affecting the organizational capabilities of the medical ethics committees and their combinations were explored.Results:Protection of rights and interests was key to medical ethics committee′s organizational capacity, while incompetency of the members and the irregular review process were sufficient reasons for the weak organizational capacity. There were six combinations of sufficient conditions for the medical ethics committee to be strong in organizational capacities, which could be explained by the three models of member capacity-orientation, system-process-orientation, and resource-system-orientation.Conclusions:The medical ethics committees are recommended to enhance members capacity, enhance team building; complete rules and regulations, and process mechanism; clarify organization structure, and optimize resource matching, in an effort to enhance the organizational capacity of these committees in China.