BACKGROUND:As a kind of dental implant material, the application of titanium has certain restrictions because of its higher probability of postoperative bleeding rate, infection and gingival hyperplasia. Studies have shown that polymethylmethacrylate has been used in artificial joints and artificial bones, but rarely reported to be used as dental implant material. OBJECTIVE:To explore the biocompatibility indexes such as cytotoxicity, cel adhesion rate, relative cel proliferation rate and post-implantation inflammatory response of human osteoblasts when pure titanium and polymethylmethacrylate are used as dental implant materials, so as to provide certain reference basis for the clinical usage of polymethylmethacrylate as the dental implant material. METHODS:Human osteoblasts were cultured in vitro. Three groups were divided as folows: control group (cels cultured normaly), pure titanium group (cels cultured with titanium extract) and polymethylmethacrylate group (cels cultured with polymethylmethacrylate extract). RESULTS AND CONCLUSION:Compared with the control group, the cel adhesion rate was significantly decreased after 2, 4, 8 and 16 hours of culture with pure titanium and polymethylmethacrylate extracts (P < 0.05); the cel adhesion rate in the polymethylmethacrylate group was higher than that in the pure titanium group (P < 0.05). Compared with the control group, the cels were sparse and grew slowly after 2 days of culture with pure titanium and polymethylmethacrylate extracts. Cels in the polymethylmethacrylate group grew faster with fusiform distribution and obvious drawing phenomenon. Compared with the control group, the relative cel proliferation rate was significantly decreased after 2 days of culture with pure titanium and polymethylmethacrylate extracts (P < 0.05); the relative cel proliferation rate of polymethylmethacrylate group was higher than that of the pure titanium group (P < 0.05). The expression of inflammatory factors in rat serum was significantly increased after 7 days of implantation of titanium and polymethylmethacrylate materials (P < 0.05), the expression of inflammatory factors in the polymethylmethacrylate group was less than that in the titanium group (P < 0.05). There was only one rat developing alergic reaction, but no pyrogen reaction and no death in the polymethylmethacrylate group; and three rats presented with alergic reaction, one rat present with pyrogen reaction and no death occurred in the pure titanium group. These results demonstrate that as the dental implant material, polymethylmethacrylate is superior to pure titanium in the cel toxicity, inflammatory response and biocompatibility.

In the clinical practice,critically ill patients are in great risk of delirium because of the impact of psychological,surroundings,illness,and medications,with the incidence rate as high as 45％-87％.Delirium could result in bad prognosis and clinical consequences of cognitive function in late stage.Dexmedetomidine (DEX) is a novel and highly selective 2-adrenoceptor agonist.It offers beneficial pharmacological properties and has been widely used in intensive care unit (ICU).In order to provide scientific and effective references for clinical practice,this paper reviewed the development of DEX intervention for the prevention of delirium in ICU both in China and abroad refereed to the pharmacological characteristics and the efficiency in clinic and the influence factors ofthe efficiency;and also discussed the possible mechanisms,such as modulating the neurotransmitters,and attenuating stress response and inflammation.

AIM:To investigate the principle of function of Stomach-Clearing Powder (Radix Rehmanniae, Radix Angelicae Sinensis, Cortex Moutan Rhizoma Coptidis, etc.) on clearing the stomach-heat. METHODS: 5% alcohol water were used as drink water of mice to make model. In the treatment group, "Stomach-Clearing Powder" was administed. Three weeks later, the anal temperature, the evacuation time of active carbon powder,stomach cAMP, SOD, MDA and the pathological changes in stomach and tongue were observed and recorded. RESULTS: "Stomach-Clearing Powder" could can obviously improve the pathological changes of the model group with stomach-heat syndrom. CONCLUSION: The established pathological model of stomach-heat syndrome accorded with traditional Chinese medicine; "Stomach-Clearing Powder" has the effect on clearing the stomach-heat on the experimental mouse.

OBJECTIVE: To investigate the expression of B-cell translocation gene 1 (BTG1) and to determine the relationship between BTG1 expression and clinicopathological features, biological behaviors in laryngeal squamous cell carcinoma. METHOD: Immunohistochemistry and Western blot were used to analyze BTG1 protein expression in 70 cases of laryngeal cancer and 35 cases of adjacent corresponding laryngeal mucosal tissues to illuminate the relationship between BTG1 expression and clinical factors. RESULT: The positive rate of BTG1 protein expression was 31.43% in laryngeal carcinoma tissues, significantly lower than 91.43% in the adjacent laryngeal tissues (P < 0.05). Western blot showed the relative expression of BTG1 protein between cancer lesion and adjacent tissue were 0.217 ± 0.032 and 0.918 ± 0.081, showing the difference with statistical significance (P < 0.05). The expression of protein was significantly correlated with the tumor invasion, lymph node metastasis, clinic stage and histological grade (P < 0.05 or P < 0.01), but not with sex, age and tumor location (P > 0.05) of patients with laryngeal cancer. CONCLUSION The expression of BTG1 protein was decreased in laryngeal squamous cell carcinoma, suggesting that BTG1 gene may be closely associated with the carcinogenesis and the degree of malignancy. Detection of BTG1 expression may be useful in diagnosis, treatment and prognosis of laryngeal carcinoma.
Carcinoma, Squamous Cell ; metabolism ; pathology ; Head and Neck Neoplasms ; metabolism ; pathology ; Humans ; Immunohistochemistry ; Laryngeal Mucosa ; metabolism ; Laryngeal Neoplasms ; metabolism ; pathology ; Lymphatic Metastasis ; Neoplasm Grading ; Neoplasm Proteins ; metabolism ; Neoplasm Staging ; Prognosis ; Squamous Cell Carcinoma of Head and Neck

Objectives: To determine the regulation effects of recombinant human growth hormone(rhGH) on dipeptide transport(PepT1) in normal and severe scalded rats. Methods: Male Sprague Dawley rats inflicted by 30% total body surface area ( TBSA) Ⅲ degree scalding were employed as the model.The rhGH was used in this study with the dose of 2 U/(kg?d). An everted sleeve of intestine was incubated in Kreb’s solution with radioactive dipeptide ( 3 H Glycylsarcosine, 3 H Gly Sar, 10 ?Ci / ml) at 37℃ for 15 min to measure the effects of uptake and transport of PepT1 of small intestinal epithelial cells in normal and severe scalded rats. Results: The transport of dipeptide in normal rats with injection of rhGH was not significantly increased compared with controls ( P =0.192 6) while the uptake was significantly increased compared with controls ( P = 0.025 3 ). The transport and uptake of PepT1 in scalded rats with injection of rhGH were significantly increased compared with controls( P = 0.008 2 and 0.039 1). Conclusions: The effects of uptake and transport of dipeptide transporters in small intestinal epithelial cells with severe injury were markedly upregulated by rhGH.

BACKGROUND:It is reported that gelatin sponge particles and chitosan/α, β-glycerophosphate gel microspheres have high application prospects in the treatment of hemoptysis of pulmonary tuberculosis.METHODS: Forty SPF Kunming mice were selected to make animal models of pulmonary tuberculosis hemoptysis using aerosolized inhalation device and randomly divided into two groups undergoing embolization for hemostasis using gelatin sponge particles and chitosan/α, β-glycerophosphate gel microspheres, respectively. Body mass changes, hemostasis time, effective rate of hemostasis, related indexes of myocardium and pathological changes of pulmonary tuberculosis were observed at 15 and 30 days after treatment.RESULTS AND CONCLUSION:(1) Mice in the chitosan/α, β-glycerophosphate gel microspheres group had higher body mass than those in the gelatin sponge group at 15 days after treatment (P < 0.05). (2) Compared with the gelatin sponge group, the hemostatic efficiency was higher and the time of hemostasis was shorter in the chitosan/α, β-glycerophosphate gel microspheres group (P< 0.05). (3) There were no significant differences in the levels of BNP precursor, creatine kinase isoenzyme and creatine kinase between the two groups (P > 0.05). (4) The lymphocyte infiltration and necrotic lesions were found around the microspheres, necrotic lesions were found, and there were a lot of active cells on the microspheres. There were a few lymphocytes in the gelatin sponge group. These results show that that the chitosan/α, β-glycerophosphate gel microspheres have better hemostatic effects in comparison with gelatin sponge particles in a mouse model of pulmonary tuberculosis.

With thousands of sequenced 16 S rRNA genes available,and advancements in oligonucleotide microarray technology,the detection of microorganisms in microbial communities consisting of hundreds of species may be possible.The existing algorithms developed for sequence-specific probe design are not suitable for applications in large-scale bacteria detection due to the lack of coverage,flexibility and efficiency.Many other strategies developed for group-specific probe design focus on how to find a unique group-specific probe that can specifically detect all target sequences of a group.Unique group-specific probe for each group can not always be found.Hence,it is necessary to design non-unique probes.Each probe can specifically detect target sequences of a different subgroup.Combination of multiple probes can achieve higher coverage.However,it is a time-consuming task to evaluate all possible combinations.A feasible algorithm using relative entropy and genetic algorithm (GA) to design group-specific non-unique probes was presented.

Objective To observe the role of α7 nicotinic acetylcholine receptor (α7nAChR) in the protection against delirium by the use of dexmedetomidine (DEX) in endotoxin derived delirium and its mechanism. Methods 100 male adult C57BL/6 mice were randomly divided into normal saline control group (NS group), DEX control group, lipopolysaccharide (LPS) induced endotoxemia model group (LPS group), DEX protection group (DEX+LPS group), and α-bungarotoxin antagonism group (α-BGT+DEX+LPS group), with 20 mice in each group. A model of endotoxemia was reproduced by intraperitoneal injection of LPS 20 mg/kg, and the mice in NS group and DEX control group were given equivalent sterile normal saline. The mice in DEX control group, DEX+LPS group, and α-BGT+DEX+LPS group were intraperitoneally injected with DEX 40 μg/kg 15 minutes before LPS injection. The mice in α-BGT+DEX+LPS group were intraperitoneally injected with α7nAChR inhibitor α-BGT 1 μg/kg 15 minutes before DEX injection. The mice in NS group were given equivalent sterile normal saline. Ten mice in each group were assigned for open field test before and 24 hours after model reproduction, and the mice were then sacrificed to obtain the specimens. The levels of tumor necrosis factor-α (TNF-α) and neuron-specific enolase (NSE) in serum were determined by enzyme-linked immune sorbent assay (ELISA). Western Blot method was used to determine the expression of choline acetyltransferase (ChAT) and acetylcholinesterase (AChE) in hippocampus. Another 10 mice were subjected to new object recognition test to observe the total exploration time during training period and preference index at 3 hours and 24 hours after LPS challenge. Results There were no significant differences in all parameters between NS group and DEX control group. ① It was shown by the open field test results that there were no significant differences in all parameters of open field test before model reproduction among all the groups. Twenty-four hours after model reproduction, when compared with NS group, the mice in LPS group showed that they had the ability of cognition of new environment, but learning and memory abilities were lowered, and tension was increased. DEX could significantly attenuate the degree of delirium, however, the protection of DEX from the delirious syndrome was antagonized partly by α-BGT. ② The new object recognition test results showed that compared with NS group, the ability of exploring new object was decreased in LPS group. DEX could significantly improve the exploration ability. However, DEX failed to control the delirious syndrome in α-BGT+DEX+LPS group. ③ The results of ELISA showed that the levels of TNF-α and NSE in serum were significantly increased in LPS groups as compared with that in NS group, and the levels of TNF-α and NSE were significantly decreased in DEX+LPS group. However, α-BGT could antagonise the protective effect of DEX [TNF-α (ng/L) in NS, LPS, DEX+LPS and α-BGT+DEX+LPS groups was 23.72±3.13, 808.78±87.86, 192.96±31.47, 829.99±80.98, respectively, and NSE (μg/L) was 8.70±0.74, 25.90±3.03, 18.10±2.14, and 23.12±2.21, respectively, all P < 0.01]. ④ The results of Western Blot showed that compared with NS group, the protein expression of ChAT in LPS group was significantly declined, and the protein expression of AChE was significantly increased. DEX could reverse the expressions of ChAT and AChT, however, α-BGT could reverse the protective effect of DEX [ChAT (gray value) in NS, LPS, DEX+LPS and α-BGT+DEX+LPS groups was 1.536±0.150, 0.381±0.138, 0.914±0.173, 0.628±0.088, respectively, and AChE (gray value) was 0.382±0.201, 1.843±0.325, 0.898±0.155, and 1.470±0.220, respectively, P < 0.05 or P<0.01]. Conclusions Delirium syndrome may occur in mice with endotoxemia. DEX could attenuate endotoxemia-associated delirium syndrome through transforming central neurotransmitter, and its mechanism maybe related with α7nAChR.

Objective To explore the relation between vitamin D deficiency and susceptibility to spinal tuberculosis. Methods A total of 163 hospitalized patients with untreated spinal tuberculosis in Tianjin Haihe hospital were enrolled in this study from June 2013 to May 2016. A total of 170 individuals participated in health examination program at the same period were enrolled as the control group. The serum level of 25-hydroxyvitamin D [25(OH)D] was measured by enzyme linked immunosorbent assay. The 25(OH)D grading included serious deficiency group (<25 nmol/L), deficiency group (≥25 nmol/L and <50 nmol/L), insufficiency group (≥50 nmol/L and <75 nmol/L) and sufficiency group (≥75 nmol/L). Histopathological classification was confirmed by intraoperative findings. Results The serum level of 25(OH)D was significantly lower in patient group [23.99(20.55,29.54)nmol/L] than that of control group [42.94(35.68,51.04) nmol/L] (P<0.01), and which was also significantly lower in four seasons than that of controls (P<0.05). The serum levels of 25(OH)D were significantly higher in summer group than those of winter group in both patient and control groups (P<0.008 3). The proportion of patients with serious deficiency of 25(OH)D was significantly higher in spring and winter groups in patient group, which was significantly lower in summer group (P<0.01). There was no significant difference in patients with serious deficiency of 25(OH)D between four seasons (P<0.01). For control group, there was a higher proportion of cases with deficiency of 25(OH)D in four seasons, and there was no significant difference in the distribution of seasons (P>0.05). In patient group, there were 107 cases of caseous necrosis type, 56 cases of hyperplasia type, and the proportion of caseous necrosis type was significantly higher in the severe deficiency group (79.17%, 76/96) than that of deficiency group (46.27%, 31/67, P<0.01). Conclusion Excluding the effect of season, vitamin D deficiency is associated with susceptibility to spinal tuberculosis and histopathologic classification.

Background and purpose:B-cell translocation gene 1(BTG1) can inhibit cell proliferation, promote cell apoptosis and regulate cell cycle progression and differentiation in a variety of cell types. This study aimed to explore the inlfuence on cell proliferation, apoptosis and cell cycle and its related mechanism of laryngeal cancer Hep - 2 cell lines through BTG1 overexpression byin vitro experiments.Methods:The BTG1 expression plasmids were constructed and transfected into Hep-2. They were divided into experimental group (transfected BTG1 of Hep-2 cells) and control group (transfected empty plasmid of Hep-2 cells). Western blot method was used to identify BTG1 protein expression levels of cells; proliferation activity of cells was detected by MTT assay; lfow cytometry was used to analyze the cell cycle distribution and AnnexinⅤ-FITC/PI cell apoptosis; Western blot was also used to assay cell cycle regulatory protein and apoptosis-related protein expression.Results:The pEGFP-N1-BTG1 plasmid was constructed successfully, and the expression of BTG1 protein was higher in experimental group than that in control group (0.921±0.091vs 0.308±0.047,P<0.05). Compared with the two group of laryngeal cancer Hep-2 cells, the cell growth in experimental group was slowed down and the proliferation was reduced (P<0.05); Cyclin D1 protein expression level was decreased (0.436±0.023vs 0.916±0.092,P<0.05), the proportion of G0/G1 phase cell cycle was increased [(85.1±5.2)%vs (63.8±3.1)%,P<0.05], the proportion of S phase cell was decreased [(8.3±1.1)%vs (23.1±1.5)%, P<0.05], phosphatidylserine ectropion in experimental group was increased, cell early apoptosis was significant [(10.3±1.1)%vs (2.8±0.3)%,P<0.05] and anti-apoptotic protein Bcl-2 expression level was reduced(0.167±0.009vs 0.834±0.084,P<0.05).Conclusion:BTG1 high expression could inhibit the proliferation growth of laryngeal Hep-2 cells and promote its apoptosis, and the possible mechanisms are interrelated with BTG1 involved in cell cycle regulation and causing cell apoptosis.