Objective To investigate the effects of 2-methoxyl estradiol(2-ME)on the expression of L-selectin and its mRNA and the relationship between L-selectin and bcr/abl fusion gene expression in chronic myelocytic leukemia(CML)K562 cells.Methods The cultured K562 cells were divided into three groups.The control group,K562 cells were cultured without 2-ME treatment.The experimental group,K562 cells were cultured in the medium containing different concentrations of 2-ME(1,2,4,8 and 16?mol/L)for 36h.The negative control group,K562 cells were replaced by water without RNase in the medium containing different concentrations of 2-ME for 36h.The expression of L-selectin protein in K562 cells was determined by flow cytometry(FCM)method.The expression of L-selectin mRNA in K562 cells was detected by half-quantitative reverse transcription-polymerase chain reaction(RT-PCR).The bcr/abl fusion gene expression in K562 cells was detected by quantitative SYBR Green Ⅰ real-time RT-PCR.Results After being treated with 2-ME at different concentrations for 36 hours,the expression of L-selectin protein and its mRNA increased in K562 cells in a concentration-dependent manner,and the expression level in the experimental group was higher than that in the control group(P

AIM: To study the neuroprotective effect and molecular mechanism of progesterone on reperfusion injury following ischemia. METHODS: The rats with transient middle cerebral artery occlusion(MACO) was described by Zea-longa for 2 h and reperfusion for 24 h. 48 male rats were divided randomly into 6 groups that were the sham, ischmia/reperfusion (I/R), dimethl sulfoxide (DMSO), and posttreatment, pretreatment, pre+posttreament with PROG groups. The immunohistochemistry staining and TUNEL reaction were used to facilitate the quantities of p53 protein and apoptosis in the brain tissuses. RESULTS: There were 26.25? 3.54 cells in p53 immunostaining in the I/R group, 22.88? 3.52 cells in DMSO group, 15.00? 2.07 cells in the pretreatment group, 16.75? 2.60 cells in the posttreatment group, and 10.38? 1.69 cells in the pre and posttreament group. The number of apoptosic cells was 1.88? 0.25 in the sham group, 41.38? 3.85 in the I/R group, 38.13? 5.69 in the DMSO group, 22.88? 2.70 in the pretreatment group, 25.63? 2.93 in the posttreatment group, and 20.88? 2.30 in the pre+posttreament group. The difference among drug management groups(pretreament, posttreament, and pre+posttreament)and control groups(I/R, DMSO)was significant (P

The pure squalene(99.9%) was separated from liver oil of Mustelus griseus(Pietschmann) by TLC on silver nitrate-impregnated silica gel. The structure of squalene was confirmed by MS, ~1H-NMR and ~(13)C-NMR techniques.

Objective To evaluate the levels of serum organochlorine pesticide residues in breast cancer patients and benign breast disease patients from Tangshan areas. Methods One hundred fifty-eight breast cancer patients and 129 benign breast disease patients from two districts of TangShan were entrolled in the study. The levels of serum organochlorine pesticides ( DDTs and HCHs) were detected through gas chromatography/electron capture. Spearman's rank correlation was used between age, BMI and the level of serum organochlorine pesticide residues in patients. Results The serum levels of a-HCH, p-HCH and PP'-DDE between breast cancer patients and benign breast disease patients were statistically different(P <0. 05). The serum levels of p-HCH and PP'-DDE were positively correlated with age and BMI in both groups, with correlation coefficients of 0. 272 and 0. 330 for age and 0. 207 and 0. 313 for BMI in the breast cancer patients,as well as correltion coefficients of 0. 339 and 0. 260 for age and 0. 227 and 0. 209 for BMI in the benign breast disease patients. Conclusions The levels of organochlorine pesticide residues in serum in breast cancer patients were higher than those in benign breast disease patients and were positively correlated with age and BMI. The results offer more information to the pathogenesis, prevention and control measures of breast cancer.

Objective To observe the levels of serum lipid, blood pressure, waist circumference and blood glucose and to investigate the clinical features of metabolic syndrome in patients with acute cerebral infarction. Methods Serum lipid, blood pressure (systolic/diastolic blood pressure), waist circumference, and blood glucose in 2030 patients with acute cerebral infarction were analyzed retrospectively. Results The prevalence of metabolic syndrome of 2030 inpatients with acute cerebral infarction was 67.73%, and the men and women were 71.80% and 62.00% respectively. The proportions of hypertension, abnormal waist circumference, lipid abnormalities, and impaired fasting glucose in the men were significantly higher than those in the women (all P ＜ 0.05 ). The proportions of metabolic syndrome,hypertension, abnormal waist circumference, and impaired fasting glucose increase with the age (all P ＜ 0.05 ). Conclusions The prevalence of metabolic syndrome in patients with acute cerebral infarction is high. It is very important to evaluate metabolic syndrome in patients with acute cerebral infarction. Controlling dyslipidemia, hypertension, hyperglycosemia, and obesity in the primary and secondary prevention of ischemic stroke can not be ignored.

Objective: To study the effects of soluble multi-peptide agent,marked “Gu Kang Tai Ling”,derived from bone tissue on rat bone fracture healing.Methods 80 right tibia defects of rats were sawed.The “Gu Kang Tai Ling”were intramuscularly injected to the rats.The quality of the defect healing was investigated continuously and respectively by the defect bone histomorphometry,biomechanics,X-ray film,and bone mineral density(BMD).Results: Under the treatment of the agent,at early stage trabecular bone volume (TBV)ratio increased 24.7%,and osteoblast surface(OBS)26.7%,at late stage mean trabecular healing surface rate(MTHSR)was increased 38.8%,tibia anti-fracture strength 0.4527～1.4350N，and BMD 7.65% compared with the control group.Conclusion: “Gu Kang Tai Ling”can accelerate rat fracture healing and improve the quality of healing.

BACKGROUND: Mini-screw anchorage is an innovation technique applied in the orthodontic field, expanding the treatment ability of orthodontic appliance. Accurate of mini-screw insertion in the target position is a clinical problem which making orthodontist trouble in this technique application. OBJECTIVE: To introduce a kind of three dimensional guide of mini-screw used as anchorage in orthodontic treatment and to evaluate the positioning accuracy. DESIGN, TIME AND SE'I-rlNG: A contrast study was performed at the Department of Orthodontics, Capital Medical University from April to October 2005. PARTICIPANTS: Twenty cases (40 mini-screws) of maxillary critical anchorage requisition were considered as the experimental group, and 15 cases (30 mini-screws) who were not treated with surgical guide were considered as the control group. METHODS: Self-made stent was used as a positioning guide for implantation of mini-screw anchorage between the roots of upper second bicuspid and first molar. Thereafter, the position was measured. MAIN OUTCOME MEASURES: The vertical distance from measure points to the reference middle line were measured. RESULTS: In 40 mini-screws inserted with the aid of surgical guide, the average survival time of mini-screw as anchorage was 10.3 months, 2 were lost, and the success rate was 95%. The average survival time of 30 mini-screws in the control group was 9 months, 9 were loss, and the success rate was 70%. The positioning measurement showed that deviation of mini-screw was not found in the experimental group, but it was found in the control group. CONCLUSION: By aid of surgical guide splint, mini-scraw can be inserted correctly into the target region.

Objective To study the influence of gene transfer of TNFR on the tumorcidal activity of TNF. Methods By constructing retroviral expressin vector of TNFR and transfecting package cell PA317,the virus that can transfer TNFR was established.Then the virus was used to infect BIU 87 cell line.The TNFR number on tumor cell membrane and the tumorcidal activity of TNF in vitro were detected. Results The number of TNFR on cell membrane of BIU 87 cell was 912/cell and increased to 2 872/cell( P

Objective Investigating transplanted time of periosteal mesenchymal stem cell (PMSC) Methods Rat PMSCs were allografted into rat tibia defects made in different time of granulation Then the quantity of formatted bone,i.e.,trabecular volumm rate (TVR),in the defects were measured in histology and bone histomorphometry by 2,3,4 and 8 weeks respectively after transplantation The long bone draft fracture defects of patients were allografted with PMSC of youth children after 2 week of fracture Results TVR was higher and the defects healed more fast in those rats transplanted PMSCs within 2 weeks after the defect were made However there was insignificant difference between the groups of PMSC transplantation was carried out after two weeks of the defect The fractured defects were healed in 15 cases (57 7%) and were not healed in 11 cases (42 3) after 9 months of transplantation Conclusion That rat bone defects were transplanted PMSC within 2 weeks showed expected bone formed effect and insignificant effect on accelerating defect healing by PMSC transplantation in rats or patients after 2 weeks.

ObjectiveTo investigate the effect of NF-?B on the differentiation and maturation of mu rine bone marrow-derived dendritic cells (DC) in vitro.MethodsThe activity of NF-?B in dendritic cells was blocked by oligodeoxyribonucleot ide Decoys (ODN Decoys) containing two special binding sites for NF-?B. Morpho logical changes of DS were observed. The expression of assistant molecules on th e cell surface was detected by using flow cytometer, and the stimulating activit y of allogeneic T lymphocyte proliferative response was determined in culture mu rine DC. The effect of NF-?B on the maturation and immunobiological activity o f murine DC was studied.ResultsNF-?B ODN Decoys were efficiently incorporated by DC, markedly suppressed the maturation of DC, the expression of assistant costimulatory molecules (CD80, CD8 6 and CD40) on the surface of DC and the secretion of IL-12, blocked the develo pment of DC and this blocked function was not reversed by lipopolysaccharide (LP S). In mixed lymphocyte reactions, DC treated with NF-?B ODN Decoys could indu ce allogeneic T cells hyphoresponsiveness, and this was associated with the inhi bition of Th1-type cytokines (IL-2 and IFN-?) production.ConclusionsNF-? B is a key gene to the development and maturation of DC. Specific interference w ith NF-?B in DC using ODN Decoys approaches could offer a novel strategy for i nducing and generating tolerogeneic immature DC and provide a promising means to induce transplant immune tolerance.