Objective:To investigate the effect of basic fibroblast growth factor(bFGF) on the proliferation of gingiva-derived mesenchymal stem cells(GMSCs) in vitro.Methods:GMSCs were isolated from healthy gingival tissue samples and identified.GMSCs of passage 4 were treated by bFGF at 0,0.5,1,5,10,20 ng/ml respectively for 1-9 d.The proliferation of the cells was evaluated using CCK-8 kit.Results:bFGF at 0.5-20 ng/ml increased GMSCs proliferation.0.5-10 ng/ml of bFGF showed dose and time dependant proliferation promoting effect on GMSCs.Conclusion:bFGF can increase GMSCs proliferation ability in a dose and time dependant manner.

Objective To investigate traditional Chinese medical emotional intervention on the cognition function of senile patients after abdominal surgery. Methods Seventy senile patients having elective abdominal operation were randomized into intervention group and control group, 35 cases in each group. The control group received routine peri-operative nursing, and the intervention group was given routine peri-operative nursing and emotional intervention based on the theory of traditional Chinese medicine. The cognition function was evaluated with mini-mental state examination (MMSE) on preoperative day 1, postoperative day 3 and 7, and serum S100βprotein level was detected before operation and on postoperative day 7. Results (1)Time for recovery from general anesthesia in the intervention group was much shortened as compared with that of the control group(P<0.05). (2)On postoperative day 3, the incidence of postoperative cognitive dysfunction(POCD) was much lower than that of the control group(P<0 . 0 5), and on postoperative day 7 , the difference of POCD incidence was insignificant between the two groups(P>0.05). (3) On postoperative day 7, serum S-100β protein level in the two groups was increased as compared with that before treatment(P<0.05), but the difference between the two groups was insignificant(P>0.05). Conclusion Traditional Chinese medical emotional intervention has an effect on shortening time for recovery from general anesthesia and decreasing POCD incidence, but has no effect on POCD incidence and serum S100βprotein level on postoperative day 7.

Genome of Arabidopsis has a kind of genes encoding proteins with ARM repeat domains and some of these proteins are known to play important roles in plant development and responses to hormone. An Arabidopsis mutant lfr with a distinct phenotype was got in leaf and flower development. The gene is predicted to encode a protein with ARM repeat domains. In order to study its function and molecular mechanism, recombination expression plasmid pGEX-2TGST∶LFR was constructed and transformed into the host bacteria strain Rosetta. Then IPTG was used to induce the recombinant protein expression in engineering strain. The expression products were detected by 12% SDS-PAGE. The GST∶LFR fusion protein was existed in soluble form with a relative molecular mass 77 ku, which is fit with the molecular mass supposed from gene coding frame. After purification by GST-tag affinity chromatography and electroelution, the fusion protein was used as antigen to prepare polyclonal antiserum in rabbits. After the fifth injection of antigen, the antiserum was obtained and further purified by decreased nonspecific bacteria and GST-tag antibody with method of immuno-precipitation. Western blot analysis showed that the purified antiserum, raised against the recombination LFR protein in rabbits, could react to the recombinant protein expressed in Rosetta specifically. And then the nuclear proteins of Arabidopsis wild type and mutant were extracted and separated by SDS-PAGE. Western blot assays revealed that there was a protein band, with a relative molecular mass 50 ku, indicating that antiserum could react to the native protein expressed in Arabidopsis specifically.

Problem-based learning (PBL) teaching method combined with formative evalua-tion was used in the teaching practice of pediatrics education. This method was implemented by four phases: courses designing, group-preparing, problems-organizing and teaching practice. The method was evaluated by students' feedback and survey results of patients, teachers and teaching councilors. It was showed that the teaching effects of PBL combined with formative evaluation was better than tra-ditional teaching method in pediatrics teaching.

OBJECTIVETo study the root canal curvatures of adolescents' maxillary first premolars in Guangdong province and the differences between male and female were studied.

METHODS200 maxillary first premolars among adolescents in Guangdong Province (100 males and 100 females) were numbered in proper. After access preparation, a K-file was inserted into the canal until the tip of the file was just seen at the apical foramen. Then standardized periapical images were taken from mesial-distal and buccal-lingual directions with radio visio graphy. The angle of canal curvature (CCA) was determined according to the method described by Schneider. Then the curved canals whose angle were more than 5 degrees were chosen, and the canal access angle (CAA), curvature height (X) and curvature distance (Y) were determined according to the method described by Günday. Linear correlations of the measurements were analyzed.

RESULTS59.21% of the total roots were curved in buccal-lingual directions. The incidence rates of males' and females' were 49.74% and 68.98%, respectively. 41.05% of the total roots were curved in mesial-distal directions. The incidence rates of males' and females' were 36.27% and 45.99%, respectively. 6.84% of the total roots were S-shaped curves. 4.15% and 9.63% of canals from male and female were S-shaped curves, respectively. The curvatures of single root canals between male and female had statistical differences in buccal-lingual directions (P<0.05). The curvatures of the lingual root canals from females in buccal-lingual directions and mesial-distal directions was higher than males' (P<0.05). The Y of buccal root canals in buccal-lingual directions and mesial-distal directions and the CCA of lingual root canals in buccal-lingual directions between male and female had statistical differences (P<0.05). The CAA of curved buccal canals and curved palatal canals from female and female had positive correlation with CCA and X (P<0.01), while negative correlation with Y (P<0.05).

CONCLUSIONThere are curved root canals in buccal-lingual and mesial-distal directions in the maxillary first premolars, and some curved root canals were S-shaped. The curved canals incidence rate of females was higher than males.

Bicuspid ; Dental Pulp Cavity ; Female ; Humans ; In Vitro Techniques ; Male ; Root Canal Therapy ; Tooth Root

Squamous cell carcinoma of the head and neck is the sixth most common cancer in the world, 40% of which occurs in the oral cavity. Although the level of early diagnosis and treatment of oral cancer has been significantly improved, the 5-year survival rate of advanced patients is still low. Nanomedical technology has the ability to efficiently deliver drugs, nucleic acids and contrast agents, enhance the tolerance of patients and improve the quality of life while improving the accuracy of diagnostic technology and the efficacy of chemotherapeutic drugs, thus providing a broad prospect for the diagnosis and treatment of oral cancer. This paper reviews the research progress of the application of nanomedical technology in both diagnosis and treatment of oral cancer.

Objective: To study the effects of hedysarum polybotys saccharides (HPS) and selenizated hedysarum polybotys saccharides (SE-HPS) on the oral squamous cancer cell line SCC25. Methods: Different concentrations (0, 10, 25, 50, 100, 200, 400 μg/ml) of HPS and SE-HPS were added to SCC25 cells in the logarithmic growth stage. Cell proliferation was detected by the CCK-8 method, apoptosis was detected by flow cytometry, and apoptosis-related indexes were observed by RT-qPCR and Western blotting. Results : The concentrations of HPS and SE-HPS inhibited the proliferation of SCC25 cells. The inhibitory effect of 50 μg/mL HPS and SE-HPS on the proliferation of SCC25 cells was the strongest and was time-dependent. The inhibition effect significantly increased within 48 h, and the effect was achieved after 48 h. At the plateau stage, SE-HPS inhibited the proliferation of SCC25 cells more strongly than HPS (P < 0.05). The results of flow cytometry showed that 50 μg/mL HPS and SE-HPS acted on SCC25 cells for 48 h, and the apoptotic rates were 25.8% and 30.8% respectively. Compared with the control group (0 μg/mL HPS and SE-HPS), the difference was statistically significant (P < 0.05). RT-qPCR and Western blotting showed that 50 μg/mL HPS and SE-HPS acted on SCC25 cells for 48 h, and the mRNA and protein expression levels of the apoptosis gene Fas/FasL were upregulated. The difference was statistically significant (P < 0.05). Conclusion Both HPS and SE-HPS can inhibit the proliferation of SCC25 oral cancer cells, but SE-HPS is superior to HPS and can induce apoptosis through the Fas/Fasl pathway.

OBJECTIVE To investigate the effects of Codonopsis pilosula polysaccharide （CPP） regulating the nuclear factor- erythroid 2-related factor 2 （Nrf2）/heme oxygenase-1 （HO-1） signaling pathway on gastric mucosal injury in rats with chronic atrophic gastritis （CAG）. METHODS Rats were randomly divided into control group， model group， CPP low-dose， medium-dose and high-dose groups （CPP 10， 20， 40 mg/kg）， and ML385 group （Nrf2 inhibitor ML385 30 mg/kg+CPP 40 mg/kg）， 10 rats per group. CAG rat model was established using N-methyl-N′- nitro-N-nitrosoguanidine combined with irregular diet， then they were given drugs for consecutive 6 weeks. HE staining was used to observe the pathological changes in gastric tissue morphology； the levels of serum gastrin （GAS）， motilin （MTL）， pepsin （PP）， as well as tumor necrosis factor-α （TNF-α）， interleukin-8 （IL-8） malondialdehyde （MDA） and superoxide dismutase （SOD） in gastric mucosal tissue were detected； TUNEL assay was used to observe gastric mucosal tissue cell apoptosis； immunohistochemical assay was adopted to observe the expressions of Nrf2 and recombinant Bcl2 associated X protein （Bax） in gastric mucosal tissue； Western blot was used to detect the expressions of Nrf2， HO-1， Bax and Bcl-2 proteins in gastric mucosal tissue. RESULTS Compared with the control group， the gastric mucosal tissue was damaged； the levels of GAS， MTL， PP and SOD， and the protein expressions of Nrf2， HO-1 and Bcl-2 were significantly reduced in model group （P＜0.05）， while the levels of MDA， TNF-α and IL-8， the cell apoptosis index， and the protein expression of Bax were significantly increased （P＜0.05）. Compared with model group， CPP low-dose， medium-dose and high- dose groups showed varying degrees of improvement in gastric mucosal histopathology； the levels of the quantitative indicators were significantly reversed （P＜0.05）. Nrf2 inhibitor ML385 significantly attenuated the improvement effect of high-dose CPP on the above indicators in CAG rats （P＜0.05）. CONCLUSIONS CPP can improve gastric mucosal injury in CAG rats， and inhibit oxidative stress， inflammatory response， and cell apoptosis. The mechanism of action may be related to the activation of Nrf2/HO-1 signaling pathway.