Radiomics-based prediction of microsatellite instability in stage Ⅱ and Ⅲ rectal cancer patients based on T2WI MRI and diffusion-weighted imaging / 中华外科杂志

Objective: To examine the radiomics model based on high-resolution T2WI and diffusion weighted imaging (DWI) in predicting microsatellite stability in patients with stage Ⅱ and Ⅲ rectal cancer. Methods: From February 2016 to October 2020, 175 patients with stage Ⅱ and Ⅲ rectal cancer who met the inclusion criteria were retrospectively collected. There were 119 males and 56 females, aged (63.9±9.4) years (range: 37 to 85 years), including 152 patients with microsatellite stability and 23 patients with microsatellite instability. All patients were randomly divided into the training group (n=123) and the validation group (n=52) with a ratio of 7∶3. The region of interest was labeled on the T2WI and DWI images of each patient using the ITK-SNAP software, and PyRadiomics was used to extract seven kinds of radiomics features. After removing redundant features and normalizing features, the least absolute shrinkage and selection operation were used for feature selection. One clinical model, three radiomics models and one clinical-radiomics model were constructed in the training group based on a support vector machine. The area under receiver operating characteristic curve (AUC), sensitivity, specificity, and accuracy were used to evaluate the performance of the models in the verification group. Results: Three clinical features (age, degree of tumor differentiation, and distance from the lower edge of the tumor to the anal edge) and six radiomics features (two DWI-related features and four T2WI-related features) most related to microsatellite status of rectal cancer patients were selected. The AUC of the clinical-radiomics model in the training group was 0.95. In the validation group, the AUC was 0.81, better than the clinical model (0.68, Z=0.71, P=0.04), and equivalent to the T2WI+DWI model (0.82, Z=0.21, P=0.83). Conclusions: Radiomic features based on preoperative T2WI and DWI were related to microsatellite stability in patients with stage Ⅱ and Ⅲ rectal cancer and showed a high classification efficiency. The model based on the features provided a noninvasive and convenient tool for preoperative determination of microsatellite stability in rectal cancer patients.

Effect of Modified Si Junzitang Drug Serum on Expression of Apoptosis-related Molecules of Gastric Cancer Cell SGC-7901 / 中国实验方剂学杂志

Objective: To explore the effect of modified Si Junzitang (MSJZT) drug serum on the expression of apoptosis-related molecules of gastric cancer cell SGC-7901 and further its anti-tumor mechanism.Method: A total of 40 SD rats were randomly divided into four groups:low-dose,middle-dose,high-dose MSJZT (0.213,0.426,0.853 g·kg-1) groups and normal group (n=10).The treatment groups were administrated through gastric perfusion,and the normal group was given the equivalent volume of normal saline for 10 days.1.5 h after the last treatment,chloral hydrate peritoneal anesthesia was performed,blood was collected from heart,and different doses of serum were separated to prepare drug-containing serum of low-dose,middle-dose,high-dose MSJZT groups,in order to incubate SGC-7901 gastric cancer cell.Early and late apoptosis rates were detected with flow cytometry.Afterwards,the tumor suppressor gene p53,c-nucleoprotein gene (c-Myc),cysteine-aspartic acid protease-3(Caspase-3),B-cell lymphoma-2(Bcl-2) mRNA expressions were confirmed by fluorescence quantitative polymerase chain reaction (Real-time PCR).The protein expressions of p53,c-Myc,Caspase-3,Bcl-2 were detected by immunofluorescence.Result: Compared with the normal group,the high-dose MSJZT group could obviously increase the apoptosis rate to 22.58%(PPPPPPConclusion: MSJZT drug serum could exert an anti-tumor effect by inhibiting the expression of the anti-apoptotic protein Bcl-2,and promoting the expressions of pro-apoptotic-related molecules p53,c-Myc,Caspase-3.

Effect of salmeterol/fluticasone propionate combined with lip shrinkage respiration on the treatment of pneumoconiosis complicated COPD / 中国职业医学

OBJECTIVE: To observe the effects of combined treatment using salmeterol / fluticasone propionate and lip shrinkage respiration on the treatment of patients with pneumoconiosis complicated with chronic obstructive pulmonary disease( COPD). METHODS: By random number table method,98 patients with stable pneumoconiosis complicated with COPD were divided into 3 groups: drug treatment group( 33 cases) was treated only with inhalation of salmeterol /fluticasone propionate( 50 μg /500 μg),twice a day; lip shrinkage respiration group( 34 cases) was treated with abdominal breathing and lip shrinkage respiration training,three times daily for 15 min per session; combined treatment group( 31 cases) was treated with both the above treatments. Before and after 6 months of treatment,the lung function,the 6-minute walk distance and the oxygen saturation( Sa O2) were detected. The modified Medical Research Council( m MRC) Respiratory Questionnaire was used to evaluate the degree of dyspnea. RESULTS: After 6 months of treatment,the forced vital capacity percentage( FVC%),percentage of forced expiratory volume in one second( FEV1%),maximum ventilatory volume( MVV),6-minute walking distance,m MRC degree and the Sa O2 improved in the patients of these 3groups compared with those before treatment( P < 0. 05). Compared with the drug treatment group or lip shrinkage respiration group after treatment,the FVC%,FEV1%,MVV,6-minute walking distance and the Sa O2 in the combined treatment group were higher( P < 0. 05),and the m MRC degree was lower( P < 0. 05). CONCLUSION: Salmeterol /fluticasone propionate combined with lip shrinkage respiration treatment had better therapeutic effect than single treatment in treating patients with pneumoconiosis combined with COPD.

Effect of Pinggan Qianyang Recipe Containing Serum on Angiotensin II Induced Vascular Smooth Muscle Cell Proliferation and Migration and DNA Methylation / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To observe the effect of Pinggan Qianyang Recipe (PQR) on inhibiting angiotensin II (Ang II) induced proliferation and migration of vascular smooth muscle cells (VSMCs) and changes of DNA methylation.</p><p><b>METHODS</b>VSMCs were cultured using tissue explant method, and PQR containing serum was prepared. Primarily cultured VSMCs were divided into four groups, the normal group, the model group, the folate group (folic acid intervention) , and the PQR group. The proliferation and migration of VSMCs was duplicated by Ang II. After 24-h Ang II induced culture, 40 microg/mL folic acid was added to the folate group for 48 h, while 5% PQR containing serum was added to the PQR group for 48 h. The cell growth curve of VSMCs was drawn by using Cell Counting Kit (CCK-8). The proliferative activity of VSMC was determined by MTT assay. The migration of VSMCs was measured by Millicell chamber. The general level of cytosine methylation in cell nucleus was detected via 5-mC antibodies immunofluorescence, and mRNA expression levels of DNA methyltransferase 1 (DNMT1) were measured by Real-time q-polymerase chain reaction (q-PCR).</p><p><b>RESULTS</b>VSMCs were promoted by Ang II at 10(-6) mol/L for 24 h. Compared with the normal group, the proliferative activity and migration quantity of VSMCs obviously increased, and DNA methylation level obviously decreased (P < 0.05, P < 0.01). Compared with the model group, the cell growth, proliferative activity and migration quantity of VSMCs obviously decreased and the general DNA methylation level increased in the folate group and the PQR group (P < 0.05, P < 0.01). Compared with the normal group, the mRNA expression of DNMT1 decreased in the model group (P < 0.01). Compared with the model group, mRNA expression of DNMT1 in Ang II induced VSMCs was obviously enhanced in the folate group and the PQR group (P < 0.01).</p><p><b>CONCLUSIONS</b>PQR could inhibit Ang II induced proliferation and migration of VSMCs, and cause high genomic DNA methylation level. Changes of DNA methylation might be associated with DNMT1 expression.</p>

Cytisine, a Partial Agonist of α4β2 Nicotinic Acetylcholine Receptors, Reduced Unpredictable Chronic Mild Stress-Induced Depression-Like Behaviors

Cytisine (CYT), a partial agonist of α4β2-nicotinic receptors, has been used for antidepressant efficacy in several tests. Nicotinic receptors have been shown to be closely associated with depression. However, little is known about the effects of CYT on the depression. In the present study, a mouse model of depression, the unpredictable chronic mild stress (UCMS), was used to evaluate the activities of CYT. UCMS caused significant depression-like behaviors, as shown by the decrease of total distances in open field test, and the prolonged duration of immobility in tail suspension test and forced swimming test. Treatment with CYT for two weeks notably relieved the depression-like behaviors in the UCMS mice. Next, proteins related to depressive disorder in the brain region of hippocampus and amygdala were analyzed to elucidate the underlying mechanisms of CYT. CYT significantly reversed the decreases of 5-HT1A, BDNF, and mTOR levels in the hippocampus and amygdala. These results imply that CYT may act as a potential anti-depressant in the animals under chronic stress.

metabonomics research on coronary heart disease patients of phlegm turbidity syndrome and qi deficiency syndrome / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To study the correlation between Chinese medical types of coronary heart disease (CHD) [i.e., phlegm turbidity syndrome (PTS) and qi deficiency syndrome (QDS)] and their metabolites.</p><p><b>METHODS</b>Recruited were 65 CHD patients including 37 cases of PTS and 28 cases of QDS. Serum endogenous metabolites in the two syndrome types were determined by gas chromatograph-mass spectrometer-computer (GC/MS), and their differences between their metabolic profiles analyzed.</p><p><b>RESULTS</b>More than 100 chromatographic peaks were totally scanned. Chromatograms obtained was matched with mass spectrum bank, and finally we got the category contribution value of 46 kinds of substances. Results of MCTree analysis showed patients of PTS and patients of QDS could be effectively distinguished. Compounds contributing to identify the two syndromes were sequenced as serine, valine, 2 hydroxy propionic acid. Comparison of metabolites showed contents of serine and 2 hydroxy propionic acid were higher in patients of PTS than in patients of QDS (P<0.05).</p><p><b>CONCLUSION</b>The differences in the metabonomics of CHD TCM syndrome types could provide material bases for TCM syndrome differentiation of CHD, indicating that metabonomics technologies might become a new research method for TCM syndrome typing.</p>

miR-200c inhibits metastasis of breast cancer cells by targeting HMGB1 / 华中科技大学学报（医学）（英德文版）

miR-200c has been shown to regulate the epithelial-mesenchymal transition (EMT) by inhibiting ZEB1 and ZEB2 expression in breast cancer cells. This study further examined the role of miR-200c in the invasion and metastasis of breast cancer that goes beyond the regulation on ZEB1 and ZEB2 expression. In this study, the bioinformatics software (miRanda) was used to predict the target gene of miR-200c and Renilla luciferase assay to verify the result. The metastatic breast cancer cells MDA-MB-231 were cultured and transfected with the miR-200c mimic or inhibitor. The expressions of miR-200c and HMGB1 were detected by RT-PCR and Western blotting, respectively. Transwell assay and wound healing assay were employed to examine the invasive and migrating ability of transfected cells. Target prediction and Renilla luciferase analysis revealed that HMGB1 was a putative target gene of miR-200c. After transfection of MDA-MB-231 cells with the miR-200c mimic or inhibitor, the expression of miR-200c was significantly increased or decreased when compared with cells transfected with the miR-200c mimic NC or inhibitor NC. Moreover, the expression of HMGB1 was reversely correlated with that of miR-200c in transfected cells. Tranwell assay showed that the number of invasive cells was significantly reduced in miR-200c mimic group when compared with miR-200c inhibitor group. It was also found that the migrating ability of cells transfected with miR-200c mimics was much lower than that of cells transfected with miR-200c inhibitors. It was suggested that miR-200c can suppress the invasion and migration of breast cancer cells by regulating the expression of HMGB1. miR-200c and HMGB1 may become useful biomarkers for progression of breast cancer and targets of gene therapy.

miR-200c inhibits metastasis of breast cancer cells by targeting HMGB1 / 华中科技大学学报（医学）（英德文版）

miR-200c has been shown to regulate the epithelial-mesenchymal transition (EMT) by inhibiting ZEB1 and ZEB2 expression in breast cancer cells. This study further examined the role of miR-200c in the invasion and metastasis of breast cancer that goes beyond the regulation on ZEB1 and ZEB2 expression. In this study, the bioinformatics software (miRanda) was used to predict the target gene of miR-200c and Renilla luciferase assay to verify the result. The metastatic breast cancer cells MDA-MB-231 were cultured and transfected with the miR-200c mimic or inhibitor. The expressions of miR-200c and HMGB1 were detected by RT-PCR and Western blotting, respectively. Transwell assay and wound healing assay were employed to examine the invasive and migrating ability of transfected cells. Target prediction and Renilla luciferase analysis revealed that HMGB1 was a putative target gene of miR-200c. After transfection of MDA-MB-231 cells with the miR-200c mimic or inhibitor, the expression of miR-200c was significantly increased or decreased when compared with cells transfected with the miR-200c mimic NC or inhibitor NC. Moreover, the expression of HMGB1 was reversely correlated with that of miR-200c in transfected cells. Tranwell assay showed that the number of invasive cells was significantly reduced in miR-200c mimic group when compared with miR-200c inhibitor group. It was also found that the migrating ability of cells transfected with miR-200c mimics was much lower than that of cells transfected with miR-200c inhibitors. It was suggested that miR-200c can suppress the invasion and migration of breast cancer cells by regulating the expression of HMGB1. miR-200c and HMGB1 may become useful biomarkers for progression of breast cancer and targets of gene therapy.

Observing the effect of high glucose on proliferation of bone marrow stromal stem cells through Wnt/Β-catenin pathway / 中国医学科学院学报

<p><b>OBJECTIVE</b>To explore the effect of high glucose on proliferation of bone marrow stromal stem cells through Wnt/Β-catenin pathway.</p><p><b>METHODS</b>Bone marrow stormal cells were obtained from the mandible of Wistar rats and stimulated with different concentrations of glucose (5.5 and 16.5 mmol/L). Cell proliferation was evaluated with methyl thiazolyl tetrazolium assay (1, 3, 5, and 7 d)and cell cycle analysis by flow cytometry (5 d). Β-catenin and cyclin D1 protein levels were determined by Western blot. The mRNA expression of lymphoid enhancer binding factor-1 (LEF-1) and cyclin D1 were tested by real-time polymerase chain reaction.</p><p><b>RESULTS</b>The results of methyl thiazolyl tetrazolium assay indicated that the optical density values of two different concentrations of the glucose had no statistical difference on day 1 (P=0.700). On days 3, 5, and 7, the optical density values of the 16.5 mmol/L group were significantly lower than those in the 5.5 mmol/L group (P=0.006, P=0.002, and P=0.003). Cell cycle analysis indicated that high glucose concentration could reduced the progression from phase G1 to S, and the proliferation index values of the 16.5 mmol/L group were significantly lower than those of the 5.5 mmol/L group (P=0.014). The Β-catenin and cyclin D1 levels were lower in the 16.5 mmol/L group when compared with the 5.5 mmol/L group. High glucose condition also reduced the mRNA expressions of LEF-1 and cyclin D1.</p><p><b>CONCLUSION</b>High glucose can inhibit the proliferation of bone marrow stormal cells by suppressing the expressions of Β-catenin, LEF-1, and cyclin D1 in the Wnt/Β-catenin pathway.</p>

Effect of early oral enteral nutrition on clinical outcomes after colorectal cancer surgery / 中华胃肠外科杂志

<p><b>OBJECTIVE</b>To investigate the effect of early oral feeding with enteral nutrition after surgery on clinical outcomes in patients with colorectal cancer.</p><p><b>METHODS</b>Forty-eight patients with colorectal cancer undergoing elective operation between January 2012 and May 2012 were randomly divided into study group (n=24) and control group (n=24). Patients in the group were given small amount of water several times and enteral nutrition early after surgery. Patients in the control group received conventional postoperative care protocol. Nutritional status, immune function, time of flatus, postoperative hospital stay, medical cost and incidence of complications between the two groups were compared.</p><p><b>RESULTS</b>As compared to the control group, nutritional status and immune function in the study group were significantly better (P<0.05). In the study group, time to flatus [(54.3±11.9) h vs. (65.7±10.0) h, P<0.05] and postoperative hospital stay [(5.4±1.1) d vs. (7.1±1.4) d, P<0.05] were significantly shorter, and medical cost [(36.3±6.4) thousand RMB vs. (42.8±4.3) thousand RMB, P<0.05] was significantly less as compared with the control group. No difference of the complication incidence was found [12.5% (3/24) vs. 16.7% (4/24), P>0.05].</p><p><b>CONCLUSION</b>Early oral feeding with enteral nutrition after surgery can improve the nutritional status and immune function, and accelerate the recovery of patients with colorectal cancer.</p>

Effect of early oral enteral nutrition on clinical outcomes after gastric cancer surgery / 中华胃肠外科杂志

<p><b>OBJECTIVE</b>To investigate the effect of early oral feeding with enteral nutrition preparation after surgery on clinical outcomes in patients with gastric cancer.</p><p><b>METHODS</b>Sixty patients with gastric cancer undergoing radical operation between July 2010 and May 2011 were randomly divided into two groups using random digit table: experimental group(n=30, administration of water and enteral nutrition early after surgery) and control group(n=30, conventional postoperative care protocol). Clinical outcomes, immune function, and nutritional status between the two groups were compared.</p><p><b>RESULTS</b>As compared to the control group, duration of fever was significantly shorter in the experimental group [(81.1±6.4) h vs. (87.3±8.0) h, P<0.05], as were postoperative time of flatus [(79.9±9.5) h vs. (86.6±8.7) h, P<0.05] and postoperative hospital stay [(7.83±2.23) d vs. (9.57±1.96) d, P<0.01]. The medical cost [(30,220±3,220) RMB vs.(34,600±32,120) RMB, P<0.01] was lower than that in the control group. There was no significant difference in morbidity between the two groups[13.3%(4/30) vs. 16.7%(5/30), P>0.05]. The levels of CD3(+)T, CD4(+)T, NK cell, CD4(+)T/CD8(+)T, albumin, and prealbumin were higher in the experimental group as compared to the control group on postoperative day 3 and 7(P<0.05).</p><p><b>CONCLUSION</b>Early oral feeding with enteral nutrition preparation after surgery can improve the nutritional status and immune function, and accelerate the rehabilitation for patients with gastric cancer.</p>

Clinical study on risk factor associated with gut flora change in patients with rectal cancer during perioperative period / 中华胃肠外科杂志

<p><b>OBJECTIVE</b>To investigate the effects of the different treatment on gut flora in patients with rectal cancer in the perioperative period.</p><p><b>METHODS</b>A total of 64 patients with rectal cancer were prospectively enrolled from July 2010 to June 2011 at the Qingdao University Medical College Affiliated Hospital, and randomized into 8 groups receiving different treatments in perioperative period. Factorial design was used to study three factors including preoperative bowel preparation, antibiotics use, and postoperative fasting. Patients were randomized into 8 groups with 8 patients in each group using the random digit table. Preoperative and postoperative stool specimens were collected and diluted, which were transferred to selective medium. Bacteria counts were calculated after 48 hours of culture under constant temperature. The changes in gut flora between the different groups were compared.</p><p><b>RESULTS</b>Compared to the preoperative parameters, total bacteria, Bifidobacterium, Peptostreptococcus, Lactobacillus, Bacteroides, Enterococcus decreased significantly(P<0.05), while the E.coli count increased significantly. The bacillus/coccus ratio was significantly imbalanced. Preoperative bowel preparation, oral antibiotics, and postoperative fasting were all predominant factors associated with gut flora(all P<0.05). Compared with the antibiotic restriction group, Bacteroides, Enterococcus, Lactobacillus, Peptostreptococcus, and total bacteria count were reduced significantly, and the bacillus/coccus ratio increased in the non-antibiotics restriction group(P<0.05). In the bowel preparation group, Bacteroides, Peptostreptococcus, total bacteria count, and the bacillus/coccus ratio decreased(P<0.05). In the postoperative fasting group, Bacteroides, Enterococcus, total bacteria, and bacillus/coccus ratio decreased(P<0.05).</p><p><b>CONCLUSIONS</b>Antibiotics, bowel preparation, and postoperative fasting can affect the number and ratio of gut flora in patients with rectal cancer in the perioperative period, leading to dysbacteriosis.</p>

Effect of different perioperative treatments on gut flora in SD rats / 中华胃肠外科杂志

<p><b>OBJECTIVE</b>To study the effects of different perioperative treatments on the number and proportion of gut flora in SD rats.</p><p><b>METHODS</b>Forty-eight SD rats were randomized into 8 groups including the control group, antibiotics group, bowel preparation group, fasting group, antibiotic-bowel preparation group, antibiotics-bowel preparation-fasting group, bowel preparation-surgery-antibiotics-early postoperative feeding group (early feeding group), and bowel preparation-surgery-antibiotics-postoperative fasting group. The rats were sacrificed and stool specimens were collected from the cecum. Stools were diluted and transferred to selective medium. Bacteria counts were calculated after 48 hours of culture under constant temperature. The changes in gut flora between the different groups were compared in terms of E.coli, Bacteroides, Bifidobacterium, and Enterococcus.</p><p><b>RESULTS</b>Compared with the control group, the total bacteria, Bacteroid, Enterococcus, Bifidobacterium were all significantly decreased(P<0.05), while the E.coli count and the bacillus/coccus ratio were significantly elevated(P<0.05). In the bowel preparation group, the total bacteria count, Bacteroid, Enterococcus, Bifidobacterium were all significantly decreased(P<0.05), while the E.coli count remained stable(P>0.05) and the bacillus/coccus ratio was significantly elevated(P<0.05). In the fasting group, the total bacteria count, Bacteroid, Enterococcus, Bifidobacterium were all significantly decreased(P<0.05), while the E.coli count remained stable(P>0.05) and the bacillus/coccus ratio was significantly elevated(P<0.05). Early postoperative feeding increased E.coli, Enterococcus, and total bacteria count(P<0.05), and lowered bacillus/coccus ratio(P<0.05) as compared to the fasting group.</p><p><b>CONCLUSIONS</b>Antibiotics, bowel preparation, and fasting have influence on the gut flora of SD rats in count and bacillus/coccus ratio, leading to dysbiosis. Early postoperative feeding may improve dysbiosis.</p>

Experimental study on co-culture of salivary adenoid cystic carcinoma cells and ganglia / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To construct the co-culture models of salivarya denoid cystic carcinoma (SACC) cells and dorsal root ganglia (DRG) of chickens and investigate the promotive effects of SACC on neural tissue.</p><p><b>METHODS</b>Glass-base culture dish was adopted to construct co-culture model of SACC-83 cells and DRG. SACC-83 cells were seeded in the medium pore with DRG around them. Outgrowth of neuronal processes was observed. Then DRG was cultured in the conditioned medium of SACC-83, with the groups of conditioned medium of MC3T3-E1 and HGF, the group of cell lysis buffer, the groups of serum-free medium and serum-plus medium as the controls. Outgrowth of neuronal processes was also recorded and compared with control groups.</p><p><b>RESULTS</b>In the co-culture model of tumor and neuronal tissue, SACC-83 cells produced a suitable microenvironment in which neuronal processes remarkably grow. Neuronal processes of most DRG displayed growth tendency toward SACC. The group of conditioned medium from SACC-83 manifested obvious promotive effects on DRG.</p><p><b>CONCLUSIONS</b>Co-culture model of tumor and neuronal tissue was successfully constructed, with which the promotive effects of tumor on outgrowth of neuronal processes could be observed. So hypothesized that SACC could secrete some neurotrophic factors to guide peripheral nerves gemmating and to trigger the cascade of the neural invasion in succession.</p>

Scanning electron microscopy observation of the growth of osteoblasts on Ti-24Nb-4Zr-8Sn modified by micro-arc oxidation and alkali-heat treatment and implant-bone interface / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To observe the efficacy of micro-arc oxidation and alkali-heat treatment (MAH) on Ti-24Nb-4Zr-8Sn (Ti2448).</p><p><b>METHODS</b>Disks (diameter of 14.5 mm, thickness of 1 mm) and cylinders (diameter of 3 mm, height of 10 mm) were fabricated from Ti2448 alloy. Samples were divided into three groups: polished (Ti2448), micro-arc oxidation(MAO-Ti2448), micro-arc oxidation and alkali-heat treatment (MAH-Ti2448). MC3T3-E1 osteoblastic cells were cultured on the disks and cell morphology was observed with scanning electron microscopy (SEM) aftre 3 days. The cylinder samples were implanted in the tibia of dogs and implant-bone interface was observed with SEM after 3 months.</p><p><b>RESULTS</b>A rough and porous structure was shown in both MAO and MAH group. The MC3T3-E1 cells on the MAH-Ti2448 discs spread fully in intimate contact with the underlying coarse surface through active cytoskeletal extentions. Osseointegration was formed in the implant-bone interface in MAH samples.</p><p><b>CONCLUSIONS</b>MAH treatment can provide a more advantageous Ti2448 surface to osteoblastic cells than MAO treatment does, and the former can improve the implant-bone integration.</p>

Effect of ultrasound on osteoprotegerin and receptor activator nuclear factor kappaB ligand expression during root resorption in rats / 南方医科大学学报

<p><b>OBJECTIVE</b>To evaluate the effect of pulsed ultrasound on the expressions of osteoprotegerin (OPG) and receptor activator nuclear factor kappaB ligand (RANKL) during root resorption in a mouse model of orthodontic tooth movement.</p><p><b>METHODS</b>Thirty-two male Wistar rats (6-8 weeks old) were randomly assigned into 4 equal groups, including the blank control group, two ultrasound exposure groups with daily local LIPUS stimulation (100 and 150 MW/cm(2)) for 10 days during mechanical loading, and the control group with mechanical loading but not LIPUS exposure. Nickel-titanium closed-coil springs were used to generate 100 g mesial force for 10 days to move the maxillary right first molars. The expression of OPG and RANKL proteins at the compression sites was detected by immunohistochemistry.</p><p><b>RESULTS</b>Ultrasound stimulation significantly up-regulated the expression of OPG and down-regulated RANKL expression (P<0.05). The expressions of OPG and RANKL showed significant differences between the two ultrasound exposure groups (P<0.05).</p><p><b>CONCLUSION</b>Ultrasound stimulation might be useful to protect against root resorption and accelerate its repair by regulating the expressions of OPG and RANKL.</p>

Study on metastasis and micrometastasis in No.14v lymph nodes of patients with lower third gastric cancer / 中华胃肠外科杂志

<p><b>OBJECTIVE</b>To study the metastasis and micrometastasis in No.14v lymph nodes in patients with lower third gastric cancer.</p><p><b>METHODS</b>A retrospective study was performed. A total of 53 patients undergoing radical resections by a single surgeon for lower third gastric cancer in the Department of General Surgery at the Affiliated Hospital of Qingdao Medical College were included. Conventional pathological section was used to detect lymph nodes metastasis and telomere TRAP-ELISA was used to identify the micrometastasis in No.14v lymph nodes.</p><p><b>RESULTS</b>A total of 96 lymph nodes were dissected from the No.14v group and lymph nodes metastasis were discovered in 9 patients by conventional pathological section. Forty-four patients had no metastasis on conventional pathological examination, of whom 13(29.6%) were found to have micrometastasis. The overall metastatic rate was 41.5%(22/53). Metastasis and micrometastasis in the No.14v lymph nodes were associated with Borrmann types, depth of invasion, No.6 lymph nodes metastasis, tumor diameter, and TNM staging(P<0.05).</p><p><b>CONCLUSIONS</b>No.14v lymph nodes in patients with lower third gastric cancer is associated with a high incidence of metastasis and micrometastasis. The status of No.6 lymph nodes may be used as an useful indicator for No.14v lymph nodes metastases during the operation.</p>

The effect of experimental osteoporosis on bone healing of autologous iliac crest graft around implants / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To investigate the influences of experimental osteoporosis (OP) on bone healing of autologous iliac crest graft around dental implants in rabbits.</p><p><b>METHODS</b>Twenty Japanese rabbits were randomly divided into two groups. Bilaterally ovariectomy was performed on experimental group and control group received sham-operation. Twelve weeks later, femoral bones were examined for bone mineral density (BMD) to verify OP status. Then bone defects were made in the proximal metaphysis of the tibiae and autologous iliac crest grafts with simultaneous implant placement were performed. The animals were killed at 8 and 12 weeks after bone graft surgery. Undecalcified sections were prepared and examined histologically and histomorphometrically.</p><p><b>RESULTS</b>Osteoporotic status caused by ovariectomy was verified by significantly decreased BMD in experimental group (P < 0.001). At 8 and 12 weeks after bone graft surgery, osseointegration was observed in both groups. However, thickness of cortical bone (TCB), bone volume in cancellous area (BVC), implant-bone contact rate (IBCR) at bone graft area all significantly decreased in experimental group when compared with control group (P < 0.01). Newly formed bone was also less in experimental group than that in control group.</p><p><b>CONCLUSION</b>Although experimental OP may not delay osseointegration of dental implants in autologous iliac crest graft, it certainly promotes resorption of bone grafts, decreases cancellous bone volume and implant-bone contact rate. Therefore it may be an important risk factor for patients receiving autologous bone graft with simultaneous implant placement.</p>

Experiment on inducing human periodontal ligament stem cells into adipose cells / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To explore the capability of human periodontal ligament stem cells (PDLSCs) differentiating into adipose cells in vitro and to determine their changes in cell morphology, structure and function during differentiation.</p><p><b>METHODS</b>PDLSCs isolated by magnetic-activated cell selection were treated continuously with adipogenic medium for 21 d. Then the cell morphology, ultrastructure, adipose specific markers of low density lipoprotein (LPL) and peroxisome proliferator activated receptor-gamma (PPAR-gamma) were analyzed by inverted contrast microscope, trans mission electron microscope (TEM), flow cytometry, immunofluorescence, RT-PCR and Western blot, respectively. These adipose-like cells were also identified by oil red O staining to determine the formation of lipid droplet, and the non-induced cells were used as control.</p><p><b>RESULTS</b>After continuous induction, the treated cells differentiated into adipose-like cells with round shape, and large amount of lipid drop in cytoplasm. 96.54% of the PDLSCs were found to differentiate into adipose cells as showed by flow cytometry, the specific markers of LPL mRNA and PPAR-gamma mRNA, and oil red O staining, respectively. Further, PPAR-gamma protein was detected in the induced cells in a time-dependent manner.</p><p><b>CONCLUSION</b>Human PDLSCs have the potential of differentiating into adipose cells under appropriate condition, and the differentiated cells exhibited characteristics of adipose cells both from cell morphology and from their functions.</p>

Changes of the ultrastructures of temporomandibular joint after removal of emotional stress factors in rats / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To examine the changes of the ultrastructures of temporomandibular joint after removal of the emotional stress factors in rats.</p><p><b>METHODS</b>Thirty-two 12-week-old male Wistar rats were divided into two groups randomly, experimental group and control group. Each group was divided into two subgroups according to execution time, 9-week subgroup and 12-week subgroup with eight rats in each subgroup. Chronic unpredictable stress animal model were firstly established in experimental group in the first 6 weeks, then all the stimulation factors removed and breed normally. After 9 weeks, rats in 9-week subgroup were killed. After 12 weeks, rats in 12-week subgroup were killed. All condyles and articular discs were dissected and observed by scanning electron microscope.</p><p><b>RESULTS</b>There was some recovery in condyles and articular discs in experimental group under scanning electron microscope. The gelatum on the surface of condyles increased, collagen fibrils became regular and deep layer collagen fibrils less exposed. There were no such obvious changes on the surface of condyles and articular discs in control group.</p><p><b>CONCLUSIONS</b>The ultrastructure injures of temporomandibular joint in rats induced by emotional stress could be reversed if the stress factors were removed.</p>