BACKGROUND:Studies have shown that methylation modification using CARM1-catalyzed histone H3R17/R26 can maintain the stemness of embryonic stem cel s. However, mechanism underlying CARM1 effect on the stemness of amniotic fluid-derived stem cel s is stil unclear.
OBJECTIVE:To investigate the function and underlying molecular mechanism of CARM1 to maintain stemness in the amniotic fluid-derived stem cel s.
METHODS:Amniotic fluid-derived stem cel s from term pregnancy were isolated and cultured. RT-PCR was used to identify the stem cel mark and CARM1 gene expression. CARM1 expression in amniotic fluid-derived stem cel s was knocked down by using two shRNA. RT-qPCR was used to detect the silencing efficiency, and western blot employed to examine the methylation level of Arginines 17 at N terminus of histone 3 (H3mR17). Moreover, the expression of embryonic stem cel markers, including OCT4, SOX2 and NANOG, were detected.
RESULTS AND CONCLUSION:Amniotic fluid-derived stem cel s from term pregnancy could express CARM1 and stem cel markers, including OCT4, SOX2, Nanog and KLF4. Both of the shRNAs could knock down the expression of CARM1 efficiently. When CARM1 was knocked down, the H3mR17 level was decreased and OCT4, SOX2 expression was also reduced, but NANOG expression had no change. Al these indicate that CARM1 is required for amniotic fluid-derived stem cel s to maintain stemness through regulating OCT4 and SOX2 expression.

Objective To analyzes the epidemic trend and sexual behavior changes among men who have sex with men (MSM ) in Yinchuan city so as to provide scientific evidence for the future development of prevention and control strategies .Methods A cross-sectional survey was conducted and data about the sexual behavior as well as trend of HIV epidemic among MSM from 2008 to 2012 were collected and analyzed .Results A total of 1 644 MSM were recruited from 2008 to 2012 .The MSM condom use rate in last time homosexual sex fluctuated between 73 .5% -80 .2% ,and their condom use rate in every time was increasing significant-ly(P<0 .05) from 54 .3% in 2012 to 44 .0% in 2008 .The HIV prevalence and 90% CI was 2 .6% (1 .1-4 .0) ,4 .5% (2 .5-7 .5) , 5 .7% (6 .6-7 .8) ,3 .8% (2 .2-5 .3) and 7 .0% (4 .9 -9 .1) respectively .The HIV prevalence was increasing significantly (P<0 . 01) from 7 .0% in 2012 to 2 .6% in 2008 .Syphilis prevalence was increasing significantly (P<0 .01) from 9 .0% in 2009 to 2 .9%in 2008 ,then decreasing significantly (P<0 .01) from 6 .3% in 2012 to 13 .6% in 2010 .Conclusion The HIV infection rate have a rising trend among MSM in Yinchuan city .More effective intervention measures should be taken to promote safe sex and curb the AIDS epidemic spread among MSM .

0.025 63 h-1).A linear relation between absorption and concentration was noted for simvastatin at a concentration of 1.0～20.0 ?g?mL-1;and within a pH value of 5.0～7.4,the absorption of simvastatin was not affected.CONCLUSION:Simvastatin showed absorption behavior in the whole section of intestine.The absorption of the drug conforms to the passive transport mechanism and first-order kinetics.The results indicate that simvastatin can be formulated and prepared into sustained-release drug delivery system.

To study the etiology and pathogenesis of seasonal contact dermatitis (SG),some skin tests including pollen allergen patch test were performed in 43 cases of SG.Sixty-two patients with al- lergic contact dermatitis(NSG) and 50 healthy individual(HG) were used as control.The results showed that the level and positivity rate of total serum IgE in SG,and the positivity rate of specific IgE,pollen allergen prick test and patch test in SG were higher than those in NSG and HG.The speeific IgE,pollen allergen prick test and pollen allergen patch test were significantly correlated,and showed high consis- tency.These results indieate that the pathogenesis of seasonal contact dermatitis he obviously associated with pollen allergen-induced IgE-mediated late-phase reaction.

OBJECTIVE To investigate the cognition on hand hygiene and the reasons affecting the hand hygiene performance in hospital.METHODS Medical staff of 358 parsons were randomly selected by questionnaire.RESULTS It was higher cognition among medical staff on hand washing indication learned from Standards of Hand Hygiene among Medical Personnel in Medical Institutions(draft for soliciting opinions) issued by the Ministry of Health.The cognition coincidence of hand sterilization indication was 68.04%,but existed some less cognition or miscognition in this field among them.The main factors affecting the hand hygiene performance were busy at work,to which was the primary cause to affect use of stream water to wash hands.The concept that using stream water wash hand is reliable is the primary cause influence medical staffs to use alcohol scrape hand.CONCLUSIONS The nosocomial infection monitoring,guidance and control should be emphasized in the field of more use of the fast hand antiseptics instead washing hands and supervising the relevance of the amount of hand hygiene product consumpsion to nosocomial infections.

OBJECTIVE:To put forward constructive suggestions about human resource management in Chinese pharma?ceutical enterprises in new century.METHODS:Based on relevant literature,the current situation of human resource manage?ment in state-own pharmaceutical enterprises was surveyed and analysed.RESULTS&CONCLUSION:Only by raising the level of human resource management and practicing new management modes,the pharmaceutical enterprises will get sustained benefit of the company and society.

Objective To study the influence of artesunate (Akt) on the proliferation and apoptosis of human head and neck squamous cell carcinoma (HNSCC), and to explore its molecular mechanism thereof. Methods The HNSCC cell line,UM-SCC-10A cells, was cultured in vitro. The Inhibitory concentration 50 (IC50) was examined by MTT assay. The cell mor?phological changes were observed under inverted light micro-scope after being interfered by 0, 2.5, 5, 10, 20 and 40μmol/L Akt. Cell cycle changes and apoptosis were measured by flow cytometry. And the expression of cell cycle regulators and apop?totic associated protein were detected by Western blot assay. Results MTT assay demonstrated that Akt significantly inhib?ited the proliferation of UM-SCC-10A cells in dose-dependent manner. After UM-SCC-10A cells were treated with Akt for 48 h, IC50 was 15.01μmol/L. Morphological changes of cell apoptosis such as karyopyknosis and conglomeration were ob?served by Hoechst 33258 staining. Flow cytometry showed that the apoptosis was associated with cell cycle arrest during the G1 phase. Western blot analysis showed that p53 and p21 protein was up-regulated and Cyclin D protein was down-regulat?ed. Furthermore, results revealed that Bcl-2 associated X protein induced by a mitochondrial pathway, cytochrome C and caspase-3 were up-regulated, and Bcl-2 and procaspase-3 were down-regulated. The mitochondrial membrane potential was reduced. Conclusion Artesunate can induce apoptosis of UM-SCC-10A cells via a mitochondrial pathway, which was associated with cell cycle arrest in the G1 phase. As a result, artesunate has an obvious inhibitory effects on proliferation of UM-SCC-10A cells.

Objective To examine the effects of blood salvage and blood preservation on erythrocyte immunity in adults. Methods Fifty patients of both sexes (22 males, 28 females) aged 25-69 yr undergoing cardiovascular or orthopedic surgery or surgery for spleen rupture or ruptured ectopic pregnancy during which ZITI-2000 autotransfusion system was used to salvage shed blood were enrolled in this study. Blood samples were taken from autotransfusion system after being heparinized, filtered, centrifuged and washed (n = 50) (group Ⅰ) , and also directly from operative field (n = 50) (group Ⅱ). In group Ⅲ blood samples were taken from bank blood after being preserved in citrate-phosphate-dextrose-adenine (CPDA) anticoagulant solution for 2 weeks ( n = 50) . The rosette rate of RBC-C3b receptor (RBC-C3b RR), The rosette rate of RBC-immune complex (RBC-ICR), the percentage of CD35-positive erythrocyte and the content of SOD in erythrocyte were measured. Results The RBC-C3b RR, the percentage of CD35-positive erythrocyte and the SOD content in erythrocyte were significantly lower in group Ⅰ and Ⅲ than in group Ⅱ(P

Objective:To discuss the effect of the choice of brain functional MRI parameter on image quality. Methods:To select nine young volunteers for scanning brain functional MRI from February to December, 2012, and analyze the effect caused by parameters to the image quality. Results:The lower of the b value, the more level 1 image, the less level 3 image;the more of the number of diffusion sensitive gradient direction, the more level 1 image, the less level 3 image. The largest impact on image quality is the interlayer spacing, the number of diffusion sensitive gradient direction and the b value. Conclusion:The factors influencing the quality of brain functional MRI images including the interlayer spacing, the number of diffusion sensitive gradient direction and b value. In the parameter selection process, one should start from diagnostic purposes and weigh the pros and cons with overall consideration.

Objective To investigate the effects of penehyclidine hydrochloride (PHCD) pretreatment on hypoxia-inducible factor-1alpha (HIF-1α) expression in lung tissues in rats with acute lung injury (ALI) induced by lipopolysaccharide (LPS).Methods One hundred and twenty female Sprague-Dawley rats,weighing 180-220g,were randomly divided into 3 groups (n =40 each):control group (group C),ALI group and PHCD pretreatment group (group P).ALI was induced by intraperitoneal LPS 5 mg/kg in ALI and P groups.The equal volume of normal saline was given intraperitoneally in group C.Group P received intraperitoneal PHCD 2 mg/kg at 30 min before LPS administration.Eight rats in each group were chosen at 2,4,8 and 24 h after LPS administration,and the lung was removed for determination of HIF-1α mRNA expression in lung tissues by RT-PCR.Eight rats in each group were chosen at 6 h after LPS administration,and the lung was removed for determination of W/D lung weight ratio and IL-6 content (by ELISA) and for microscopic examination.Results The W/D lung weight ratio and IL-6 content at 6 h after LPS administration and HIF-1α mRNA expression at each time point after LPS administration were significantly higher in groups P and ALI than in group C (P ＜ 0.05),and lower in group P than in group ALI(P ＜ 0.05).The pathological damage was significantly ameliorated in group P as compared with group ALI.Conclusion PHCD can reduce LPS-induced ALI through down-regulation of HIF-1α expression in lung tissues and inhibition of the inflammatory response in rats.