More than 50％ microRNAs (miRNAs) are located in tumor-associated genome of amplification region or fragile site,which may also act as oncogenes or tumor suppressor gene (TSG).Recently,researches show that the expression of miR-449 is lower in human gastric,lung and ovarian cancer,and may act as TSG.The abnormal expression of miR-449 plays a pivotal role in carcinogenesis and progression,and elucidating its function and regulatory,mechanism can provide valuable diagnostic,prognostic biomarker for cancer management.

Polycyclic aromatic hydrocarbons ( PAHs) are ubiquitous environmental pollutants, whose carcinogenicity is determinated.The mechanism of their carcinogenicity: PAHs are able to combine with aryl hydrocarbon hydrocarbon receptor ( AhR ) , resulting in some toxicity and carcinogenicity.AhR is a ligand-dependent activation transcription factor, which is activated by a large variety of ligands, regulating the expression of a series of gene involved in metabolism, and participating in important biological processes, such as singal transduction, cell proliferation,differentiation and apoptosis,and so on.Besides, it's closely related with the tumor development.Thus, it will provide a new approach for cancer prevention and treatment to study the role of PAHs and AhR in the development of tumor.

Objective To characterize the skin damage induced by ultraviolet radiation in officers was observed in 67.5% of the 1286 officers and soldiers:tanning in 62.05%(798/1286),photoaging in 18.66%(240/1286),polymorphous light eruption in 13.69%(176/1286)and sunbum in 13.30%(171/1286).Two hundred and thirteen subjects each had two kinds of skin amage,and 152 subjects each had three kinds of skin damage.With the time of being in the army and cumulative sun-exposure period,the prevalence of tanning,photoaging and polymorphous light eruption increased,while the prevalence of sunburn decreased.Sunburn mostly occurred in newly assigned soldiers.Conclusions The condition of skin damage nduced by ltraviolet radiation iS severe in officers and soldiers working in high altitude,and effective measures are warranted for the prevention and treatment of the skin damage.

Objective To investigate the change in the function of the motor nerve fibers of the sciatic nerve of rat following injection of different neurolytic drugs. Methods Thirty-five SD rats weighing 350-380 g were randomly divided into 7 groups ( n = 5 each): group C received normal saline; group Ad adriamycin 5 mg/ml;group Aa anhydrous alcohol; group Pg1 8% phenol-glycerol; group Pg2 10% phenol-glycerol; group Pg3 12% phenol-glycerol and group Ci cidomycin 4000 U/ml. 0.2 ml of the different neurolytic drugs was injected at the points where the branches of the sciatic nerve entering semi-membranous and adductor magnus muscles. The action potential and conduction velocity of motor and sensory nerve fibers were measured at 21 d after injection. Results The conduction velocity of sensory nerve fibers was 0 in each group. The conduction velocity and action potential of the motor nerve fibers were significantly decreased in group Ad, Aa, Pg1, Pg2, Pg3 and Ci as compared with group C (the control group). The action potential and the conduction velocity were significantly higher in group Ad than in other neurolytic drug groups. The potential and the conduction velocity were the lowest in group Aa and Pg3.The conduction velocity in group Pg1, Pg2, Ci was comparable. Conclusion 5% adriamycin seems to be a better neurolytic drug with less interference with function of motor never fibers.

Aim To explore the protective effect of ac-tive components of Xiaoxuming decoction ( XXMD ) on focal cerebral ischemia/reperfusion injury in rats dur-ing early recovery period .Methods The ischemia and reperfusion of middle cerebral artery model rats were established by nylon wire with 2 hours ischemic time on healthy male SD rats .The models of MCAO were eval-uated by Zea-Longa′s standard score .The model rats were randomly divided into sham operation group , the ischemia/reperfusion model group , the active compo-nents group of Xiaoxuming decoction and the positive group (extract of ginkgo biloba leaves EGb 761).Rats were orally administrated with different drugs 24 h after operation for up to 14 days, once a day.The effect of active components of Xiaoxuming decoction on behavior changes of MCAO rats in different recovery period was evaluated by a series of behavioral assessent methods such as modified neurological severity scores and cor-ner test.The infarct volume was observed by TTC stai-ning.Moreover, the contents of MDA and the activities of GSH-Px, SOD and NOS in the penumbra and core tissues of rat brain were detected by spectrophotometric method.Results Compared with the I/R model group, the active components group of XXMD could significantly alleviate the neurological deficit scores with prolonged administration . The motion function tended to be normal , stayed longer on the balance beam, sensory function gradually restored sensitivity , reduced the radio of turning to the right .Among them , compared with model group , the active components of XXMD could effectively improve the neurological dys-function after five days of administration ( P<0.05, P<0.01).Meanwhile, the active components of Xiaox-uming decoction could significantly reduce the infarct volume percentage in the cerebral tissue on post opera-tion day 5 and 14(P<0.01).In addition, the active components of XXMD could reduce the content of MDA and the activity of NOS , increase the activity of SOD and GSH-Px.Conclusion The active components of XXMD can generate neuroprotective effect in early stage of recovery and may play a major role in regula-ting the level of oxidative stress in rat brain .

Aim To investigate the effect of preventive administration of icariin on learning and memory abili-ties and brain mitochondrial oxidative stress in senes-cence-accelerated mouse prone8 ( SAMP8 ) . Methods
The 6-month-old SAMP8 mice were randomly divid-ed into the SAMP8 model group, ICA groups (75, 150 mg · kg-1 ) , the positive Diethylstilbestrol ( DES ) group and estrogen receptor inhibitor ICI182780 com-bined with ICA (150 mg·kg-1 ) group, with 8 mice in each group. 8 same month old SAMR1 mice were selected as the normal control group. After oral admin-istration for 8 weeks, Morris water maze test and step-down passive test were used to investigate the effects of preventive administration of ICA on learning and mem-ory abilities in SAMP8 mice. Cerebral cortex mitochon-dria were isolated to determine the effect of preventive administration of ICA on the oxidative stress by detec-ting reactive oxygen species ( ROS) level, lipid perox-ides ( MDA ) content, glutathione GSH content and catalase ( CAT ) activity. Results Preventive treat-ment of ICA could significantly improve the abilities of place navigation and space exploration of SAMP8 mice, enhance their reflex ability in step-down passive test. ICA could also reduce the level of ROS and MDA content, increase GSH content in brain mitochondria of SAMP8 mice. CAT activity was not obviously changed. Compared with ICA high dose group, the learning and memory abilities of mice in ICA and estrogen receptor inhibitor ICI182780 co-administrated group were signif-icantly decreased. However,brain mitochondria oxida-tive stress was not changed obviously. Conclusion Preventive administration of icariin can significantly improve learning and memory abilities and brain mito-chondrial oxidative stress in SAMP8 mice. The mecha-nism of ICA improving learning and memory abilities may be related to its estrogen-like effect;while the ac-tion on brain mitochondrial oxidative stress may be in-dependent of estrogen receptor.

Objective To discuss teaching methods of TCM lectures for students of Western medicine in colleges and universities.Methods Totally 36 studens majoring in Western medicine from Capital Medical University were involved in the study. The first questionnaire survey showed the interest of those students. According to the students' response, the topics for the lectures were determined. The purpose for the second questionnaire was to investigate the teaching outcomes. Results The recovery rate for the first questionnaire was 100%, and the effective rate was also 100%. Students showed interest in the course of Introduction of TCM Health Maintenance, with few different ideas. The recovery rate for the second questionnaire was 88.89%, and the effective rate was also 88.89%. Students were relatively satisfied with lecture teaching, with few different ideas.Conclusion Lecture teaching can promote students' interest and teaching quality.

Objective To explore the clinical characteristics,diagnosis and therapeutic strategies of acute appendicitis in pregnancy.Methods The clinical data of 45 cases with acute appendicitis in pregnancy,which had been diagnosed by surgeries in our hospital since Jan 2010 to Jun 2016,were retrospectively analysed.Results All patients had exhibited abdominal pain.Among them,15 patients(33.3％)had exhibited shifting pain in right lower quadrant,and 44 patients(97.8％)had abdominal tenderness.4 cases with appendiceal gangrene and 1 case with necrosis of the great omentum had been found during the surgeries.There were 5 patients had occurred complications after the surgeries,including 2 cases with poor wound healing,1 case with septic shock,1 case with inflammatory ileus and 1 case with incompletely adhesive ileus.Threatened abortion and threatened premature delivery were found in 11 patients(during 22+3 to 36+2 weeks gestation)after the surgeries.Finally,1 patient occurred abortion(25+3 weeks gestation)and 3 patients occurred premature delivery(during 28+4 to 30+4 weeks gestation).Conclusion Abdominal pain as the main clinical manifestations of the pregnancy with acute appendicitis,prone to severe complications.

Objective To investigate the effect of autophagy on histone-mediated apoptosis of human proximal tubular endothelial cells(HK-2).Methods To investigate the effect of histones on the autophagy and apoptosis,HK-2 cells were treated with increasing concentrations of histones.The rate of apoptosis and the expressions of autophagy-related protien LC3Ⅱ and Beclin1 in HK-2 cells were detected by using flow cytometry and immunoblotting assay,respectively.To further confirm the effect of autophagy on apoptosis of HK-2 cells,cells were incubated with histones after one hour pretreatment with 10 mmol/L 3-MA,a pharmacological inhibitor.The rate of apoptosis and the activity of caspase-3 of HK-2 cells were detected separately by using flow cytometry and immunoblotting assay.Results Histones significantly enhanced apoptosis of HK-2 cells in a dose-dependent manner,with the increased expressions of LC3Ⅱ and Beclin1.Blockage of autophagy by 3-MA significantly increased the apoptosis of HK-2 cells and the activity of caspase3.Conclusion Autophagy in proximal tubules protects against apoptosis induced by histones,with potential value in acute kidney injury (AKI).

Objective To explore the procedures of 3Q validation for blood coagulation analyzer under the good laboratory prac‐tice(GLP) system based on the Sysmex CA7000 automatic blood coagulation analyzer .Methods Four test indicators of PT ,APTT , TT and FIB were chosen to conduct the performance verification in the within‐run precision ,between‐day precision ,accuracy ,linear‐ity ,carry‐over contamination rate of the automatic blood coagulation analyzer .They were prothrombin time(PT) ,activated partial thromboplastin time(APTT) ,thrombin time(TT) ,and fibrinogen(FIB) .Results The within‐run precision CV values of PT , APTT ,TT and FIB were 1 .33% ,1 .57% ,1 .47% and 1 .90% ,respectively ;the inter‐day precision CV values of PT ,APTT ,TT and FIB were 1 .73% ,1 .52% ,1 .55% and 2 .14% respectively ;in terms of accuracy ,the normal quality control CV values were 7 .45% ,3 .88% ,-4 .98% and 4 .36% respectively ;the abnormal quality control CV values of PT and APTT were 8 .11% and 8 .77% respectively ;the r value of FIB linear correlation coefficient was 0 .999 3 ,the a value was 1 .02 ;the highest CV value of car‐ry‐over contamination rate was 2 .15% ;the detected results all conformed to the general industry standards and requirements of in‐strument manufacturer .Conclusion The 3Q validation under the GLP system proves that the Sysmex CA7000 automatic blood co‐agulation analyzer is good in performance and is appropriate for the laboratory work of clinical laboratory department .