Objective To determine the effects of fluoride on osteoclasts's quantity and bone resorption function in vitro and its mechanisms. Methods The osteoclasts and bone marrow stromal cells(BMSCs) isolated from long bone of new born rats were cultured respectively in TC199 medium (containing 10% fetal bovine serum) with fluoride. The osteoclasts were inoculated in 96-well culture plate and ivory slice, BMSCs were inoculated in 6- well culture plate, respectively, medium were changed after 2 hours incubation. They were divided into control group, low-dose fluoride, medium-dose fluoride and high-dose fluoride groups, the doses of sodium fluoride were 0,2.5 × 10-5,5.0 × 10-5,10.0 × 10-5 mol/L, respectively. Tartrate-resistant acid phosphatase(TRAP) staining positive cells were counted under light microscope after TRAP staining on the 2nd and the 5th day and the pit formed in ivory slices were measured by histomorphometry after staining with toludine blue. The expression of receptor activator of NK-κβ ligand(RANKL) and osteoprotegerin(OPC) was detected by real-time fluorescence quantitative (337.5 ± 70.5), (447.5 ± 43.4), (472.9 ± 34.8), (475.3 ± 24.3)/well in the control group, the low-dose, mediumdose and high-dose fluoride groups, respectively. The differences were statistically significant between these groups and the control group (all P < 0.05). After in vitro culture for 5 days, the numbers of osteoclasts were (92.5 ± 22.1), (123.0 ± 26.4), (135.5 ± 22.2), (136.9 ± 23.0) per well in the control group, the low-dose, medium-dose and high-dose fluoride groups, respectively. The differences were statistically significant between these groups and the (0.088 ± 0.030), (0.100 ± 0.018), (0.152 ± 0.015), (0.242 ± 0.031 )mm2 per piece in the control group, the lowdose, medium-dose and high-dose fluoride groups, respectively. The values of medium-dose and high-dose fluoride BMSCs in the control group, the low-dose, medium-dose and high-dose fluoride groups were 100.00 ± 56.02, 144.95 ± 97.21,223.25 ± 184.48,193.98 ± 137.93, respectively. The values of medium-dose and high-dose fluoride groups were significantly higher than that of control group (all P < 0.05). Conclusions Fluoride can cause increase in the number of osteoclasts in vitro and promote their cell differentiation and bone resorption activity, which may be related to increased expression ratio of RANKL/OPG mRNA in BMSCs.

Abstract?AIM: To investigate the influence of propylene glycol mannite sulfate ( PGMS ) on the expression of tumor necrosis factor -α( TNF-α) and interleukin-1β( IL-1β) , in diabetic retinopathy by a rat model, to study the mechanism of PGMS against diabetic retinopathy, and provide a reliable theoretical and experimental evidence for the PGMS to be applied to clinical prevention and treatment of diabetic retinopathy.?METHODS: Male Wistar rats were randomized into 4 groups, normal control group, diabetic control group and PGMS in group, the PGMS in groups included the doses of 50mg/kg and 100mg/kg. 1% streptozotocin ( STZ) of 60 mg/kg was intraperitoneally injected in rats to establish the diabetic models. The PGMS with the doses of 50mg/kg and 100mg/kg were used to gavage in different groups of models for 12wk.Twelve weeks later, the animals were sacrificed and retinas were isolated. The aqueous humors and serums were taken, expressions of TNF-αand IL-1βprotein in retinas, aqueous humors and serums were detected by enzyme-linked immunosorbent assay ( ELISA) , respectively.The location and the expression of TNF-αand IL-1βprotein in retina tissue was detected by immunohistochemistry.?RESULTS: Twelve weeks after the use of PGMS, the level of blood glucose was not changed.ELISA showed that the expression of TNF-αand IL-1βprotein in serum and retina was significantly increased in diabetic control group than in normal control group(P<0.05), but in the groups which PGMS was given reduced, lower than those in diabetes mellitus( DM) group, especially as the concentration of PGMS increased ( P<0.05 ).But the levels of aqueous humor's TNF-αand IL-1βproteins in PGMS group were not reduced.Immunohistochemistry showed that the TNF -α protein was almost not expressed in normal control group. But the TNF-αprotein was highly expressed in diabetic control group. The expression mainly located in the ganglion cell layer, the inner plexiform layer, outer plexiform layer and pigment epithelium. The TNF-αprotein was weakly expressed at the group of 50mg/kg PGMS, the TNF-αprotein was almost not expressed at the group of 100mg/kg PGMS.When the normal control group was detected, the IL-1βprotein was weakly expressed in the outer plexiform layer.But the IL-1βprotein was also highly expressed in diabetic control group.The expression mainly located in the inner plexiform layer, outer plexiform layer and pigment epithelium. The IL -1βprotein was weakly expressed at the group of 50mg/kg and 100mg/kg PGMS.?CONCLUSION:PGMS can treat the diabetic retinopathy by downregulating the expressions of TNF-αand IL-1βin early diabetic retinopathy.PGMS maybe have a good control effect on early diabetic retinopathy.

Objective To determine the impact of fluorine and aluminum,and both action combined on the number of rat osteoclasts and bone resorption cultured in vitro and to explore its mechanisms.Methods The osteoclasts and bone marrow stromal cells (BMSCs) isolated from long bone of new born rats were cultured,respectively,in TC199 medium (containing 10％ fetal bovine serum) with fluoride,aluminum and fluoride combined with aluminum.The osteoclasts were inoculated in 96-well culture plate and ivory slice,BMSCs in 6-well culture plate,and culture medium was changed after 2 hours incubation.The cells were divided into control group,fluoride group,aluminum group and fluoride combined with aluminum group; the doses of sodium fluoride were 0,1.0 × 10-4,0,1.0 × 10-4 mol/L and the doses of aluminum chloride were 0,0,1.0 × 10-5,1.0 × 10-5 mol/L,respectively.Tartrate-resistant acid phosphatase (TRAP) staining positive cells were counted under light microscope after TRAP staining on the 5th day and the pit formed in ivory slices were measured by histomorphometry after staining with toludine blue.The expression of osteoprotegerin(OPG) and receptor activator of nuclear factor kappa-B ligand (RANKL) was detected by real-time fluorescence quantitative PCR in BMSCs after 8 h treatment.Results ① Fluoride,aluminum and the interactive effects of fluoride and aluminum all had impact on the numbers of osteoclasts (F =7.15,6.56 and 7.98,respectively,all P ＜ 0.05).The numbers of osteoclasts in fluoride group,aluminum group and fluoride combined with aluminum group[(136.9 ± 22.99),(135.4 ± 23.5),(163.0 ± 24.4) per well] were higher than that in the control group[(92.5 ± 22.1) per well,all P ＜ 0.05].② Fluoride,aluminum and the interactive effects of fluoride and aluminum all had impact on the resorption pit area on ivory slices(F =10.47,12.64,14.29,respectively,all P ＜ 0.05).The resorption pit area on ivory slices in fluoride group,aluminum group and fluoride combined with aluminum group[(0.242 ± 0.031),(0.293 ± 0.026),(0.333 ± 0.016)mm2 per slice] was higher than that in the control group [(0.088 ± 0.030)mm2 per slice,all P ＜ 0.05].③Fluoride,aluminum and the interactive effects of fluoride and aluminum all had impact on the expression ratios of RANKL/OPG in BMSCs (F =8.15,15.38,23.59,respectively,all P ＜ 0.05).The expression ratios of RANKL/OPG in BMSCs in fluoride group,aluminum group and fluoride combined with aluminum group [(193.98 ± 137.93)％,(326.11 ± 176.78)％,(599.84 ± 275.82)％] were higher than that in the control group[(100.00 ± 56.02)％,all P ＜ 0.05].Conclusions Both fluoride and aluminum can cause increase in the number of osteoclasts in vitro and promote cell differentiation and bone resorption activity,which may be related to increased expression ratio of RANKL/OPG mRNA in BMSCs.The stimulating effects of fluoride on osteoclasts differentiation and bone resorption is enhanced by aluminum.

Objective To characterize the antibiotic resistance,homology and carbapenemase genotypes of imipenem resistant Acinetobac1ter baumannii isolated from our hospital,and analyze the clonal relatedness of the test strains.Methods Ninety five strains of imipenem resistant A.baumannii were isolated from August 2003 to December 2004 in the First Affiliated Hospital, College of Medicine,Zhejiang University.The MICs of 16 antimicrobial agents against these strains were determined by agar dilution and E-test method.The homology of these isolates was analyzed by pulse-field gel electrophoresis(PFGE).The coding gene of carbapenemases was amplified.PCR products were purified,cloned and sequenced.Plasmid DNA was extracted and purified.Conjugation and Southern blot were performed to locate the position of oxa 23 gene.Results The resistance rates to ampicillin-sulbactam and cefoperazone sulhactam were 67.9% and 30.2%.Polymyxin E had the lowest resistance rate of 17%. The resistance rate to other antimicrobial agents was higher than 90%.The 95 strains,isolated from 10 clinical units,were classified into 6 clones.Clones A and B were predominant clones.All strains produced carbapenemases which were confirmed as OXA 23 by PCR and sequencing analysis.No plasmid was extracted and conjugation was not successful.Southern bolt showed that oxa-23 gene was located on Apal-digested chromosomal segments about 220 kb and 200 kb in Clones A and B,re spectively.Conclusions OXA 23-producing A.baumannii has become one of the most important multi-resistant pathogens in our hospital.Clones A and B have widely spread in our hospital.Oxa-23 gene is located on chromosomal DNA.

Objective To investigate the resistant mechanism of imipenem-resistant K. pneumoniae.Methods The minimal inhibitive concentrations (MICs) of the antimicrobial agents were determined by Etest.Isoelectric focusing electrophoresis (IEF),plasmid extraction,conjugation, transformation,PCR amplification,cloning and sequencing were carried out for analyzing the encoding gene of ?-1actamases.Results Three kinds of ?-1actamases were detected with pIs of 7.2,6.7,and 5.4.in a clinical strain of K.pneumoniae.These ?-1actamases were TEM-I (pI,5.4),SHV-12 (pI,8.2) and KPC-2 ( pI,6.7 ) confirmed by sequencing of the PCR products.Only one band of ?-1actamase with pI 6.7 was displayed in the transformant.A 1500 bp segment,which contained the KPC-2 gene confirmed by nucleotide sequence analysis,was cloned from a 60 000 bp plasmid of the transformant.Conclusion The strain of K.pneumoniae resistant to imipenem produces a plasmid-mediated carbapenemase KPC-2 which belongs to Bush group 2f,class A ?-1actamase.

Objective To investigate the protective mechanism of protein kinase C(PKC)and calcium sensing receptor(CaR)in ischemia preconditioned rat hearts.Methods Using cell culture method,in vitro cultured inhibitor(IPC+CaRI).Apoptosis was detected using TUNEL and Hoechst33342 cell viability was detected by MTT,the protein expression of easpase-12,calpain and CaR in endochylema were detected using Wedtetm blot.ResultsIn I/R group nucleus was shrank,big blue,chromatin concentrated,apoptotle body appeared.Other groups haddifferent fluorescence intensity varying degree,IPC+PKCI+CaRS group had more big blue nucleus.Myocardialcell viability and apoptotic rate,I/R group[(62.99±0.65)%,(19.13±0.87)%],IPC group[(78.67±0.37)%,(14.21±0.74)%],IPC+PKCI group[(71.09±0.52)%,(20.46±0.81)%],IPC+PKCI+CaRS group(66.10±0.75)%,(24.89±1.43)%],IPC+CaRS group[(69.56±0.44)%,(21.64±0.77)%],IPC+CaRI group(85.81±0.60)%,(13.12±0.69)%],all had a difference(P＜0.05 or＜0.01)compared with C group[(100.00)%,(6.02±0. 31)%].Western blot identified that CaR expression in IPC+PKCI and IPC+CaRS,IPC+PKCI+CaRS groupswas more than that in IPC and IPC+CaRI groups;easpase-12 had more active fragment(60×103)in I/R,IPC+CaRS,IPC+PKCI+CaRS groups;ealpain expressions in I/R,IPC,IPC+PKCI,IPC+PKCI+CaRS,IPC+CaRSgroups were higher than those in C and IPC+CaRI,I/R group was the highest one,C group the second,IPC+CaRI the third.Conclusion The interaction of PKC and CaR can reduce the intracellular Ca2+ from sarcoplasmicreticulum thus provide a protection.

OBJECTIVETo develop the certified reference material of mercury in lyophilized human urine.

METHODSHuman urine samples from normal level mercury districts were filtered, homogenized, dispensed, lyophilized and radio-sterilized. Homogeneity test, stability inspection and certification were conducted using a atom fluorescence spectrophotometric method. The physical and chemical stability of the certified reference material were assessed for 18 months. The certified values are based on analysis made by three independent laboratories.

RESULTSThe certified values are as follows: low level was (35.6 ± 2.1) µg/L, high level was (50.5 ± 3.0) µg/L.

CONCLUSIONThe certified reference material of mercury in lyophilized human urine in this research reached the national certified reference material requirements and could be used for the quality control.

Freeze Drying ; standards ; Humans ; Mercury ; urine ; Reference Standards ; Spectrometry, Fluorescence ; Urinalysis ; standards

OBJECTIVETo observe different effects of moxibustion on extracellular potassium ion in acupoint under physiological and pathological status and provide experimental evidence for exploring action mechanism of moxibustion on acupoint local.

METHODSForty female SD rats were randomly divided into a blank group, a blank-moxibustion group, a model group and a model-moxibustion group, 10 cases in each one. The complete Freund's adjuvant(CFA) was adopted to establish model of adjuvant arthritis (AA) in the model group and model-moxibustion group. No treatment was given in the blank group and model group while moxibustion was applied at "Zusan-li" (ST 36) for 30 min in the blank-moxibustion group and model-moxibustion group. The tissue fluid in "Zusanli" (ST 36) was collected with microdialysis and real-time analyzed by electrolytic analyzer. The change of concentration of potassium ion in "Zusanli" (ST 36) was observed.

RESULTS(1) Under physiological status, the concentration of extracellular potassium ion in the blank group was not changed within 150 min (P > 0.05); before the moxibustion, the concentration of extracellular potassium ion in the blank-moxibustion group was (1.21 +/- 0.31) mmol/L, and after treatment it was gradually increased and reached its peak at (2.38 +/- 0.42) mmol/L after 60 min (P < 0.05), then it was reduced. 150 min after the treatment, concentration of potassium ion was slightly higher than that before moxibustion as well as that in the blank group. The concentration in the blank-moxibustion group at 60 min was statistically significant compared with that in the blank group (P < 0.05). (2) Under pathological status, the concentration of extracellular potassium ion in the model group was not changed within 150 min, differences of which at each time point was not statistically significant (all P > 0.05). Before the moxibustion, the concentration of extracellular potassium ion was (1.09 +/- 0.12) mmol/L in the model-moxibustion group, and it was immediately increased to (1.96 +/- 0.18) mmol/L after moxibustion. 60 min and 90 min after the moxibustion, it still maintained a higher level, which was (1.87 +/- 0.29) mmol/L and (1.59 +/- 0.16) mmol/L respectively (both P < 0.05). The differences of each time point after moxibustion in the model-moxibustion group were statistically significant compared with those in the model group (all P < 0.05).

CONCLUSIONThe moxibustion could increase the concentration of potassium ion in rat's acupoint local under physiological status but time of effect is short; with moxibustion at "Zusanli" (ST 36) under pathological status, the concentration of local potassium ion is obviously increased and maintains for a long time.

Acupuncture Points ; Animals ; Arthritis, Experimental ; metabolism ; therapy ; Disease Models, Animal ; Female ; Humans ; Moxibustion ; Potassium ; metabolism ; Rats ; Rats, Sprague-Dawley

OBJECTIVETo investigate the mixed infection and analyze risk factors in children with severe adenovirus pneumonia.

METHODSA retrospective analysis was performed on the clinical data of 756 children with adenovirus pneumonia between June 2009 and June 2011. Pathogens and risk factors were studied in 216 severe cases.

RESULTSOf the 216 severe cases, 138 (63.9%) were aged from 6 months to 2 years, and 161 (74.5%) developed the disease in the winter and spring; 177 (81.9%) were affected by 1-4 pathogens besides adenovirus, including 74 cases (34.3%) infected with one pathogen as an addition. A total of 334 pathogen strains were identified from the respiratory secretions and sera of the 216 cases. Of them, 163 (48.8%) were bacterial strains, dominated by Gram-negative bacteria (124 strains), 108 (32.3%) were viral strains, and 40 (12.0%) were fungal strains. Multivariate logistic regression analysis indicated that congenital heart disease, congenital airway abnormalities, nutritional anemia, recurrent pulmonary infection, and surgical history were the independent risk factors for severe adenovirus pneumonia in children, with odds ratios of 3.3, 11.1, 7.2, 14.3 and 12.9 respectively (P<0.05).

CONCLUSIONSSevere adenovirus pneumonia is mostly seen in children aged from 6 months to 2 years and occurs frequently in the winter and spring. Many cases are also infected with other pathogens, most commonly Gram-negative bacteria. Congenital heart disease, congenital airway abnormalities, nutritional anemia, recurrent pulmonary infection and surgical history are the independent risk factors for severe adenovirus pneumonia in children.

Adenoviridae Infections ; epidemiology ; etiology ; microbiology ; Child ; Child, Preschool ; Coinfection ; epidemiology ; microbiology ; Female ; Humans ; Infant ; Infant, Newborn ; Logistic Models ; Male ; Pneumonia, Viral ; microbiology ; Retrospective Studies ; Seasons

OBJECTIVETo explore the possible mechanism of cyclovirobuxine D (CVB-D) in countering and inducing arrhythmia, by way of studying its electro-physiological effect on ventricular papillary muscles of rats in vitro.

METHODSThe transmembrane potential of rat's isolated right ventricular papillary muscles were recorded using conventional glass micro-electrode technique.

RESULTS(1) CVB-D in concentration of 13.3-63.3 micromol/L, showed prolonging effect on the action potential repolarization time, mainly the action potential duration 50 (APD50), APD70 and APD90, in dose-dependent manner, in concentration of 33.3-63.3 micromol/L, it could inhibit the resting potential, action potential amplitude (APA) and maximum depolarization velocity (Vmax) in dose-dependent manner. (2) CVB-D also showed time-dependent effect, the effect initiated 10 min after 20 micromol/L was perfused in ventricular muscle, the APD50, APD70 and APD90 were potentiated gradually along with prolongation of action time and reached the peak at 30-40 min, without any potentiation thereafter. (3) CVB-D could markedly prolong the effective refractory period (ERP) of action potential, increase the ratio of ERP/APD. (4) CVB-D in concentration of 33.3 micromol/L could induce frequent, multifocal spontaneous arrhythmia in some cells when the action time was longer than 45 min.

CONCLUSIONCVB-D has the action of anti-ventricular arrhythmia, the mechanism is correlated with the prolongation of APD and ERP of ventricular muscle as well as the increase of ERP/APD ratio, while it also has the effect of inducing arrhythmia, the mechanism might be concerned with excessive prolongation of APD and the inhibition on RP, APA and Vmax.

Action Potentials ; drug effects ; Animals ; Anti-Arrhythmia Agents ; pharmacology ; Arrhythmias, Cardiac ; chemically induced ; physiopathology ; Drugs, Chinese Herbal ; pharmacology ; Electrophysiologic Techniques, Cardiac ; Heart Ventricles ; drug effects ; In Vitro Techniques ; Male ; Myocytes, Cardiac ; cytology ; Papillary Muscles ; drug effects ; Rats ; Rats, Sprague-Dawley ; Refractory Period, Electrophysiological ; drug effects ; Ventricular Function