Background In vitro study showed that chemotaxis consist of chemotaxis factor 4(CXCR4)and stromal cells derived factor-1(SDF-1)and may play a role in the orientation and migration of retinal progenitor cells (RPCs)toward lesion.Overexpression of CXCR4 in RPCs can enhance the chemotaxis activity.Objective This work was to explore the feasibility and underlying mechanism of up-regulation of CXCR4 on RPCs induced by hypoxia.Methods RPCs were retained in an incubator with normal O2volume(16％)or hypoxia condition(10％ O2)for 12 hours and 24 hours respectively.Flow cytometer cell analysis screening(FACS)was conduced to measure the proportion of CXCR4-expressing cells,and CXCR4,HIF-1 mRNA were analyzed by reverse transcription-polymerse chain reaction(RT-PCR).The chemotical effect of 30 mg/L SDF-1 to RPCs cultured under the hypoxia condition was assessed using Boyden chamber.Results The expression level of CXCR4(CXCR4 mRNA/β-actin mRNA)inRPCs cultured by 10％ O2 for 12 and 24 hours were 0.28+0.07and 0.48+0.17 and increased by 1.75 and 3.00 fold more than that of 16％ O2 culture group(0.16+0.02)(P＜0.01).The expression level of HIF-1 mRNA(HIF-1 mRNA/β-actin mRNA)in RPCs cultured by 10％ O2 for 12 and 24 hours were 0.18 ±0.07and 0.38 ±0.13 and increased by 3.00 and 6.30 fold more than that of 16％ O2 culture group(0.06±0.01)(P＜0.01).The chemotical effect of 30 μg/L SDF-1 to RPCs increased from 13.00％ in 16％ O2 culture group to 36.00％ and 46.00％ in the cells cultured by 10％ O2for 12 and 24 hours.FACS revealed that the proportion of CXCR4+ cells in hypoxia-exposure for 12 and 24 hours were 26.90％ and 46.10％,respectively,but that in 16％ O2 culture group was 9.10％,showing a statistically significant difference(P ＜ 0.01).Conclusions RPCs induced by hypoxia can enhance the expression of CXCR4 in RPE cells and the chemotaxia to SDF-1.The overexpression of H1F-1 in RPCs may be involved in the up-regulation of CXCR4 expression.

Animals ; Ear Canal ; surgery ; Female ; Gene Expression ; Hypothalamus ; metabolism ; Nerve Block ; Pregnancy ; RNA, Messenger ; genetics ; Rats ; Rats, Sprague-Dawley ; Receptors, N-Methyl-D-Aspartate ; genetics ; metabolism

Animals ; Female ; Gene Expression Regulation, Developmental ; Inferior Colliculi ; metabolism ; N-Methylaspartate ; genetics ; metabolism ; RNA, Messenger ; genetics ; Rats ; Rats, Sprague-Dawley ; Receptors, N-Methyl-D-Aspartate ; genetics ; metabolism

Objective To study the association between cytotoxin-associated gene A of Helicobacter pylori (Hp-CagA) and the expressions of mtp53 and c-myc protein in different subtypes of intestinal metaplasia.Methods One hundred and sixty-five patients with gastroscopy included 125 cases with chronic atrophic gastritis with intestinal metaplasia,40 cases with non-atrophic gastritis.Intestinal metaplasia included complete intestinal metaplasia,incompletetype intestinal metaplasia,complete colonic epithelial metaplasia and incomplete colonic epithelial metaplasia.The carbon-14-urea breath test was used to determine Helicobacter pylori (Hp);AB-PAS and HID-AB mucinous staining was used to distinguish intestinal metaplasia subtypes; the immunohistochemical Elivision method was used to determine the expressions ofmtp53 and c-myc protein;indirect ELISA was used to determine Hp-CagA.Results Forty-five cases with incomplete colonic epithelial metaplasia,47 cases with incomplete type intestinal metaplasta,17 cases with complete colonic epithelial metaplasia,16 cases with complete intestinal metaplasia.The positive rate of Hp-CagA in all intestinal metaplasia subtypes was higher than that in non-atrophic gastritis,but there was no significant difference (P ＞ 0.05).The expression of mtp53 protein in incomplete colonic type of intestinal metaplasia with Hp-CagA positive was higher than that in incomplete colonic type of intestinal metaplasia with Hp-CagA negative (x2 =5.494,P ＜ 0.05).The expression of c-myc protein in incomplete colonic type of intestinal metaplasia with Hp-CagA positive was higher than that in incomplete colonic type of intestinal metaplasia with Hp-CagA negative (x2 =13.950,P ＜ 0.01).Conclusion Hp-CagA is a sort of highly virulent strain,and Hp-CagA may do a strong role in the promotion of gastric atrophy and intestinal metaplasia.

Objective To investigate the clinical application value of psychological induction in impression taking of deciduous crossbite.Methods Totally 84 children of deciduous crossbite receiving impression taking were divided equally into 2 groups.Children in the control group received impression taking directly,while children in the experimental group received psychological induction before impression taking.A comparative study was carried out according to special cooperative behavior assessment for children.Results The cooperation degree of the experiment group was increased significantly after psychological induction with statistical differences between them(P ＜ 0.05).Conclusions Psychological induction can improve the cooperation degree of children in impression taking.

Animals ; Dementia, Vascular ; blood ; psychology ; Erythrocyte Count ; Learning ; drug effects ; Male ; Memory ; drug effects ; Peptides ; pharmacology ; Rats ; Rats, Sprague-Dawley

OBJECTIVE:To monitor the antimicrobial resistance of Enterococcus faecalis and Enterococcus faecium in our hospital from 2006 to 2008 in order to provide reference for clinical rational use of antibiotics.METHODS:The susceptibility of isolated enterococci was determined by K-B paper diffusion method,and the antibiotic resistance rates of Enterococcus faecalis and Enterococcus Faecium were analyzed using Whonet 5 software.RESULTS:Vancomycin was the most sensitive antimicrobial against Enterococcus faecalis and Enterococcus faecium.E.faecalis had low resistance rates to penicillin G,high concentration gentamicin,ciprofloxacin and rifampicin,while E.faecium had low resistance rates to high concentration streptomycin,tertracycline,chloromycetin,and qinupristin/dalforpristin.CONCLUSION:E.faecalis and E.faecium are multi-drug resistant.Antimicrobials should be used rationally based on the susceptibility test of E.faecalis and E.faecium.

Based on the concept of environmental factors of ICF, together with the practice of environmental assessment and reform in the recent years, this paper discussed the principle, specification, procedures and content of environmental assessment.

A case of mercury-induced Baboon syndrome is reported.A 31-year-old female presented with a 2-3 day history of pruritic symmetric erythematous papules on both axillas,popliteal fossa,buttocks and groins.The patient was exposed to a broken mercury thermometer two days before the onset of the eruption.Patch testing showed that the patient was sensitive to ammoniated mercury,mercury,mercuric chloride and mercurochrome.The mercury levels in serum and full blood reached the up limit of normal value three days after the onset,and gradually decreased over time.The patient was diagnosed with Baboon syn- drome caused by mercury according to the clinical manifestation and results from laboratory studies.

Clinical internships play an important role in higher medical education. According to the new standards in undergraduate medical education set by the MOE and MOH,we identified 4 main problems in our internships training,including lack of awareness of career planning,interns'absence from duty,lack of hands-on opportunities,psychological problems,etc. According to these problems,we carried out a series of solutions such as strengthening intern orientation,especially in aspects of professionalism and clinical skills training,optimizing the rotation schedule and improving the evaluation methods etc. Experiential evidence and perceptions of interns and their tutors showed that these changes were effective.