The stability of marginal bone level is an important factor in ensuring long-term good clinical efficacy of implantation.The design of implant-abutment interface(IAI)is of considerable importance,including whether undergoing multiple abutment disconnection,whether platform switching is used,connection type,connection torque,and connection material differences.These fac-tors can affect the micro gap and micro movement of the connection interface,which change the size of micro leakage and mechanical stability,thereby affecting the long-term clinical efficacy of implants.This article presents a detailed review of the progress of research on different designs in implant-abutment interface,in order to provide a theoretical basis for the selection and operation of abutments in clinical diagnosis and treatment.

Objective:To explore the application effect of preoperative autologous blood localization method in laparoscopic resection of gastric stromal tumors in unfavorable areas of the stomach.Methods:A retrospective analysis was conducted on the case data of 40 patients with gastric stromal tumors in unfavorable locations admitted to Jinjiang Hospital from January 2019 to December 2022. The patients were divided into a control group (intraoperative endoscopic localization method) and an autologous blood localization group according to different intraoperative lesion localization methods, with 20 cases in each group. The surgical time, intraoperative blood loss, hospitalization time, postoperative exhaust time, and adverse reactions were compared between the two groups.Results:The surgery time of the autologous blood localization group was shorter than that of the control group [(92.30±8.80)min vs (108.20±14.87)min, P<0.05]. There was no statistically significant difference in intraoperative bleeding, hospitalization time, and postoperative exhaust time between the two groups (all P>0.05). Two groups of patients did not show an increase in inflammatory indicators such as white blood cells and C-reactive protein on the day after surgery. Both groups of patients did not experience adverse reactions such as fever, abdominal pain, or postoperative complications. Conclusions:The autologous blood injection localization method provides a safe, simple, and effective method for preoperative localization of gastric stromal tumors in unfavorable areas of the stomach under laparoscopy, and is worthy of clinical promotion and use.

Objective:To compare the clinical efficacy and quality of life of patients between Billroth Ⅱ+ Braun anastomosis and simple Billroth Ⅱ anastomosis in digestive tract reconstruction after laparoscopic distal gastric cancer radical resection.Methods:A retrospective analysis was performed on clinical data of 68 patients who underwent laparoscopic distal gastric cancer radical resection in Jinjiang Municipal Hospital from January 2019 to January 2022. Forty patients who underwent Billroth Ⅱ+ Braun anastomosis were included in the observation group, and 28 patients who underwent simple Billroth Ⅱ anastomosis were included in the control group. Perioperative indicators and postoperative indicators one year after surgery were collected to observe the safety and efficacy of patients after surgery.Results:There were no significant differences in operation time, intraoperative bleeding volume, postoperative exhaust time, time to remove gastric tube and drainage tube, and postoperative hospital stay between the two groups (all P>0.05). There were also no significant differences in postoperative complications between the two groups ( P>0.05). One year after surgery, the incidence of food retention and residual gastritis in the observation group were lower than those in the control group (all P<0.05), while there were no significant differences in the incidence of bile reflux and reflux esophagitis between the two groups (all P>0.05). One year after surgery, nutritional evaluation showed that the total protein decline and prognostic nutritional index (PNI) in the observation group were lower than those in the control group, with significant differences (all P<0.05). The incidence of bloating and reflux symptoms in the observation group one year after surgery was lower than that in the control group, with significant differences (all P<0.05). Conclusions:Billroth Ⅱ+ Braun anastomosis is a safe method for digestive tract reconstruction after laparoscopic distal gastric cancer resection, which can improve patients′ quality of life after surgery.

Gastrointestinal neoplasms is the most common digestive tract neoplasms, and its incidence rate is increasing year by year. Compared with other solid tumors, the application of immune checkpoint inhibitors in gastrointestinal neoplasms is still in the stage of continuous exploration. This paper intends to review the relevant research and latest progress of immune checkpoint inhibitors in advanced gastric cancer, mismatch repair function defect/microsatellite high instability and mismatch repair function integrity/microsatellite stability or microsatellite low instability, and further evaluate the effectiveness and safety of immunotherapy combined with relevant studies.

Objective:To explore the value and advantages of perioperative nutritional support in enhanced recovery after surgery (ERAS).Methods:The clinical data of patients admitted to Jinjiang City Hospital for acute abdomen and undergoing surgery from April 2018 to January 2021 were collected. They were divided into two groups: the enhanced recovery after surgery group (ERAS group, 78 cases) and the traditional perioperative management group (CPM group, 75 cases). The nutritional risk assessment of NRS2002 was performed on admission to the two groups. The postoperative inflammatory indexes, nutrition and rehabilitation related indexes were compared between the two groups.Results:There was no significant difference in preoperative NRS 2002 score, operation method, operation time and blood loss between ERAS group and CPM group ( P>0.05). There was no significant difference in C-reactive protein (CRP), albumin (Alb) and prealbumin (PA) between ERAS group and CPM group before operation ( P>0.05). The ALb and PA of the two groups on the first day after operation were significantly lower than those before operation, and the CRP levels on the first, third, fifth and seventh day after operation were higher than those before operation( P<0.05), with significant difference. The CRP level of ERAS group was lower than that of CPM group on the third day after operation, with significant difference ( P<0.05). On the 7th day after operation, the levels of Alb and PA in ERAS group were higher than those in CPM group ( P<0.05). The recovery time of gastrointestinal function and hospitalization days in ERAS group were significantly reduced, and the total cost of hospitalization was significantly less than that in CPM group ( P<0.05). Conclusions:Perioperative effective nutritional support is helpful to accelerate the recovery of patients with acute abdomen. The application of enhanced recovery after surgery can effectively improve the nutritional status of patients with acute abdomen, reduce the incidence of complications and improve the clinical outcome of patients.

Objective:To explore the relationship between the level of C-reactive protein/serum albumin ratio (CAR) and early postoperative anastomotic leakage in patients with colorectal cancer.Methods:From September 2016 to September 2019, all colorectal cancer patients who were treated in gastrointestinal surgery of Jinjiang hospital in Fujian Province were collected for retrospective analysis. The baseline data of the patients were collected. The blood C-reactive protein (CRP), procalcitonin (PCT) and serum albumin (ALB) were monitored on the first, third, fifth and seventh days after operation, and the results were statistically analyzed.Results:There was no significant difference in baseline data such as age, body mass index (BMI), operation time and intraoperative hemorrhage between the anastomotic leakage group and the non anastomotic leakage group ( P>0.05), but the hospitalization time of the anastomotic leakage group was longer than that of the non anastomotic leakage group ( P<0.05). The CRP level on the 3rd and PCT level on the 5th day after operation in the anastomotic leakage group were higher than those in the non anastomotic leakage group, with significant difference ( P<0.05). The CAR value on the 3rd and 5th day after operation in the anastomotic leakage group was higher than those in the non anastomotic leakage group with significant difference ( P<0.05). Conclusions:CAR can predict early anastomotic leakage in patients with colorectal cancer.

Objective To investigate the mechanisms of quercetin in retinal angiogenesis via in vitro and in vivo studies.Methods Human umbilical vein endothelial cells (HUVECs) was used in in vitro study,and oxygen-induced retinopathy (OIR) and laser-induced choroidal neovascularization (CNV) animal models were used in in vivo study.In the in vitro cell study,normal control group,VEGF-165 treatment group and VEGF-165 combined with quercetin treatment group were used.Cell counting kit-8 (CCK8) and Transwell were used to measure HUVECs cell viability,including proliferation and migration.OIR and CNV animal models were administrated through intraperitoneal injection of quercetin,and the non-perfusion area and CNV aera were evaluated.Western blot assay was used to detect the expression of integrin α5 and integrin β3 expression.In the animal study,18 breastfeeding mice and 18 infant mice were randomly divided into normal control group,model control group and quercetin treatment group,6 for each group.The animal feeding and use was in accordance with the standards set by the ARVO,and the experiment was approved by the Ethic Committee for Experimental Animal of Fu Xing Hospital,Capital Medical University (2016-KY-0036).Results In the in vitro study,VEGF-165 (20 ng/ml) promoted the proliferation and migration of HUVECs,while quercetin (50 μmol/L) inhibited HUVECs proliferation and migration significantly,comparing to the VEGF-165 treatment group (proliferation:Fgroups =18.51,P =0.00;migration:F =85.74,P =0.00).In the in vivo studies,quercetin 20 mg/(kg·day) decreased the non-perfusion area and CNV area comparing to the untreated groups,with significant differences between them (t =6.02,P =0.00;t =5.79,P =0.00).Besides,quercetin down-regulated the expression of integrin α5 and integrin β3 significantly both in the in vitro and in vivo studies.Western blot test showed that integrin α5 and integrin β3 in VEGF-165+quercetin processing 24 hours group were significantly decreased than those in the VEGF-165 group,with significant differences between them (t =4.46,P＜0.05;t =5.18,P＜0.01).Compared with the VEGF-165 +quercetin 24 hours group,the integrin α5 and integrin β3 in VEGF-165 +quercetin processing 48 hours group were increased,but they were still significantly increased than those in the VEGF-165 group,with significant differences between them (t =6.54,P ＜ 0.05;t =7.17,P ＜ 0.01).For the animal studies,quercetin also inhibited the levels of integrin α5 and integrin β3 in OIR and CNV models (t =5.44,13.52;both at P=0.00).Conclusions Quercetin can inhibit the retinal and choroidal neovascularization through integrin pathway,which provides a new treatment strategy for clinical therapy.

Aim To investigate the effects and possible mechanisms of kaemperol in the rats with chronic cere-bral ischemia.Methods Chronic cerebral hypoperfu-sion model was produced by permanent occlusion of bi-lateral common carotid arteries (2VO)in rats.After KAE treatment,the rats underwent Morris water maze and prehensile traction test.Neuronal morphology was observed using Nissl and HE staining.The activity of SOD and the content of MDA in brain tissue were de-termined.The DJ-1 protein expression was assayed by Western blot.Results Compared with 2VO model group,KAE significantly improved learning and memo-ry and the grasping ability.In addition,KAE signifi-cantly reduced brain tissue pathological injury induced by 2VO. Furthermore, KAE significantly increased SOD activity and enhanced antioxidant protein DJ-1 ex-pression in brain tissue.Conclusions KAE could sig-nificantly attenuate the cognitive impairment,limb bal-ance dysfunction and pathological injury in rats with chronic cerebral ischemia.The mechanism may be re-lated to improving the antioxidant system in vivo.

Glutamate decarboxylase (GAD) can catalyze the decarboxylation of glutamate into γ-aminobutyrate (GABA) and is the only enzyme of GABA biosynthesis. Improving GAD activity and thermostability will be helpful for the highly efficient biosynthesis of GABA. According to the Ramachandran plot information of GAD 1407 three-dimensional structure from Lactobacillus brevis CGMCC No. 1306, we identified the unstable site K413 as the mutation target, constructed the mutant GAD by site-directed mutagenesis and measured the thermostability and activity of the wide type and mutant GAD. Mutant K413A led to a remarkably slower inactivation rate, and its half-life at 50 °C reached 105 min which was 2.1-fold higher than the wild type GAD1407. Moreover, mutant K413I exhibited 1.6-fold higher activity in comparison with the wide type GAD1407, although it had little improvement in thermostability of GAD. Ramachandran plot can be considered as a potential approach to increase GAD thermostability and activity.
Glutamate Decarboxylase ; metabolism ; Half-Life ; Industrial Microbiology ; Lactobacillus brevis ; enzymology ; Mutagenesis, Site-Directed ; Mutation ; Temperature

OBJECTIVE:To explore drug quality dynamic evaluation mechanism based on analysis of drug quality announce-ment data. METHODS:The sorts and types of drugs,places of origin,quantity of production enterprises and frequency distribu-tion of being mentioned were analyzed on the basis of drug quality announcement issued by CFDA and provincial administration in 2013. RESULTS & CONCLUSIONS:Frequency of TCM being mentioned (0.75%) was higher than that of chemical drug (0.30%). Among drugs mentioned more than 10 times,the most chemical drugs were injection (70%) and the most TCM were tablet(66.7%). Among all types,drug types produced by more than 100 enterprises accounted for 62.5%,and those produced by more than 50 enterprises accounted for 93.75%,which indicated the frequency of problems was in relatively direct proportion to the quantity of drug manufacturing enterprises. Top 10 provinces in the list of the number of drug quality announcements showed different characteristics of problem type distribution. In compassion,the quality problems of TCM in Jilin,Guangxi,Mongolia,Si-chuan were prominent,and reference number proportion of involved TCM were 85%,80%,97% and 69%,respectively;the quality problems of chemical drugs in Henan,Shanxi,Jiangsu,Guangdong,Anhui,Shandong should be paid attention,and refer-ence number proportion of involved chemical drugs were 62%,61%,95%,57%,86% and 65%,respectively. It is suggested that the government should carry out the dynamic risk assessment system based on data of drug quality announcement,and strength-en standard management of data collection of local drug quality announcement.