Acute Disease ; Cytogenetics ; Humans ; Leukemia ; genetics

Objective To detect TCRγ gene rearrangements in skin lesions and peripheral blood of patients with parapsoriasis, and to study their clinical significance. Methods Totally, 20 patients with parapsoriasis were included in this study. BIOMED?2 multiplex PCR was performed to detect TCRγgene rearrangements in lesional skin (n=20)and peripheral blood(n=11)samples from the patients with parapsoriasis. Statistical analysis was performed to assess the relationship of TCRγ gene rearrangements with clinical types of parapsoriasis as well as general information and histopathological manifestations(including non?specific manifestations and atypical manifestations)of patients. Results TCRγ gene rearrangements were positive in lesional skin from 7 of the 20 patients, in peripheral blood from 3 of 11 patients, and in both lesional skin and peripheral blood from 2 patients. Positive TCRγ gene rearrangements in skin lesions were significantly correlated with mycosis fungoides(MF)?related atypical histopatho?logical manifestations(P<0.05), but those in neither skin lesions nor peripheral blood were correlated with gender and age of patients or clinical course and types of parapsoriasis(all P>0.05). During an average follow?up time of 44.85 ± 18.48 months, 1 case progressed into MF, and 2 were cured. Conclusions Positive TCRγgene rearrangements in skin lesions of patients with parapsoriasis may be correlated with MF?related atypical manifestations. The presence of TCRγgene rearrangements and atypical histopathological manifestations may suggest the possibility of progression from parapsoriasis into MF.

1 ? 25-dihydroxy-vitamin D3(1? 25 (OH)2 D3)induced differentiation of human promyelocytic leukaemia cells ( HL-60 ) into mature myeloid cells in vitro. The ratio of nuclei to cytoplasma decreased; Their nucleoli reduced; Cells became irrgular and extended the pseudopods. 1 ? 25 (OH ) 2 D3 caused significant increase of nitroblue tetrazolium ( NBT ) reduction and ?-non-specific acid esterase (?-NAE ) and acid phosphatase (ACP ) activities. These data and morphological characteristics suggest that HL-60 cells were conclusively identified as monocytes/macrophages. The histogram of DNA distribution ahylyzed by flow cytometry demonstrated G0 + G1 phase increased and S phase increased and S phase decreased remarkably after treatment with l?, 25 ( OH ) 2 D3 as compared with untreated cells.

As a foreign body, intravascular stent will induce platelet aggregation on the stent surface and activate platelet system and coagulation system, resulting in thrombosis. Smooth muscle cells migrate to injured site and proliferate, leading to intimal hyperplasia and vessel wall remodeling, which induces restenosis. Incidence of intravascular restenosis is determined by stent type, disease of the host, severity of stenosis before implantation and remnant stenosis length following stenting. Inhibition of intimal hyperplasia or improvement of intima formation and vessel wall remodeling can effectively prevent restenosis. Currently, there are many drugs to prevent restenosis, including antiplatelet drug, anti-inflammatory growth factor inhibitor and anti-cell proliferation drugs.

Objective:To study the effects of PRF and recombinant hPDGF-AB,TGF-β1 and VEGF on the proliferation and adhe-sion of rat adipose tissue-derived stem cells(ADSCs)in vitro.Methods:ADSCs were cultured with PRF membrane and various do-ses of PDGF-AB,TGF-β1 and VEGF,cell adhesion was examined by adhesion assay after 2 culture,cell proliferation was examined by CCK-8 kit after 1 -7 d culture.Results:Cell adhesion assay showed that the adhesive numbers of rat ADSCs in PRF group were significantly higher than those in the negative group(P <0.05).The adhesive numbers of the ADSCs treated by PDGF-AB showed no significantly difference among different concentration groups(P >0.05).The adhesive numbers of the ADSCs treated by VEGF or TGF-β1 at different concentrations showed significant difference(P <0.05).CCK-8 kit assay showed that at different time points, the A values of ADSCs in PRF group were significantly higher than those of the negative control group(P <0.05).The A values of ADSCs in VEGF or PDGF-AB groups at different concentrations showed significant difference(P <0.05).The A values of rat AD-SCs in TGF-β1 group at different concentrations were lower than those in the negative control group(P <0.05).Conclusion:PRF as a combination of growth factors may stimulate the proliferation and adhesion of rat ADSCs in vitro.PDGF-AB and VEGF may stim-ulate the proliferation of rat ADSCs.TGF-β1 and VEGF may stimulate the adhesion of rat ADSCs in a dose-response manner to some degree.

Objective:To evaluate the effects of the flowable resin used as pit and fissure sealant using different etching adhesive systems.Methods:60 caries-free extracted human premolars were randomly divided into 4 groups(n =1 5)and treated by Gluma, NT and 3M-Z350 flowable resin(group A);Clearifil SE Bond adhesive and 3M-Z350 flowable resin(group B),phosphoric acid etching,3M-Z350 flowable resin and phosphoric acid etching(group C)and 3Mconcise sealant(group D)respectively.After pro-cessing the tooth surface the pit and fissue of 1 0 sample in each group were sealed.The microleakage was measured by 1 % methyl-ene blue staining(n =8).The material-enamel interface was observed by SEM(n =2).The shear bond strength of the column-shaped samples with the diameter and the height of 3 mm(n =5)on the mesial or dental surface was examined by a test machine. The sealant cartridges and flowable resin cartridges with the diameter and height of 4 mm were used for the crushing strength exami-nation(n =1 0).Results:There was no significant difference in the microleakage among the 4 groups.SEMobservation showed that the resin tags of group A were long and dense and the resin tags of group B were short and sparse,bubbles and cracks were found on the local site in group A and B.The resin tags of group C were long and thin,but combined with tooth tightly;the resin tags of group D were short and dense;the penetration was poor at the bottom of the fissures in the 4 groups.The shear bond strength of Group A was the highest(P <0.01 ),that of group C was higher than that of group B and D(P <0.05).There was no significantly difference between group B and D(P >0.05).The compressive strength of flowable resin groups was higher than that of fissure seal-ant group(P <0.05).Conclusion:The shear bond strength and compressive strength of all-etching bonding system combined with flowable resin is superior to that of self-etching bonding system combined with flowable resin and the traditional sealant.Using Prime&Bond NT bond after acid etching may improve the shear bonding strength.

Objective To explore the repair possibilities of endothelial progenitor cells (EPCs)in peripheral blood in patients with different extents of obstructive sleep apnea (OSA) through measuring the levels of pro-angiogenic factors and different subgroups EPCs in peripheral blood in patients with OSA. Methods Ninety adult patients with OSA, 30 healthy controls with matched age and gender were enrolled for this study. The subjects performed Polysomnography, were divided in-to four group based on Apnea Hypopnea Index (AHI). The serum levels of HIF-1α, SDF-1αand VEGF were assessed by ELISA. Mononuclear cells were isolated from peripheral blood with density gradient centrifugation, and flow cytometry was used to detect levels of CD133+KDR+EPC, CD133+CD34+EPC, CD34+KDR+EPC and ALDHloCD34+KDR+EPC based on AL-DH activity, and CD133, CD34, PE-KDR related cell surface markers. Results The levels of CD133+KDR+EPC, CD133+CD34+EPC, CD34+KDR+EPC were higher in OSA groups than those of control group, both of which were higher in severe OSA group than those of in mild and moderate OSA groups. The levels of ALDHloCD34+KDR+EPC were higher in mild and moderate OSA groups than that of the control groups, and the levels of ALDHloCD34+KDR+EPC were significantly lower in se-vere OSA group than those of control, mild and moderate OSA groups. Serum levels of HIF-1α. VEGF were significantly high-er in OSA groups compared to those in control groups, both of which were higher in severe OSA group than those of mild and moderate OSA groups. Serum levels of SDF-1αwere significantly lower in severe OSA groups than those of mild, moderate OSA and control groups (P<0.05). Conclusion The mobilization and recruitment of different subtypes of EPCs are obvious-ly increased in patients with OSA, but ALDHloCD34+KDR+EPC with vascular repair capacity keeps to invariability, even de-creases in patients with severe OSA, which results in endothelial damage, and increases the risk of cardiovascular disease.

OBJECTIVEThis study aims to investigate the caries status of the first permanent molar and primary tooth among 7- to 9-year-old children in Tangshan city and the correlation between caries of primary tooth and the first permanent molar.

METHODSA stratified cluster sampling method was used on the basis of the Basic Approach of Oral Health Survey of WHO and the Guideline of the Third National Oral Health Survey. A total of 10 primary schools were randomly sampled in clusters that included 51 primary school sampling spots in Tangshan. The caries status of 1 794 children aged 7 years to 9 years was examined.

RESULTSThe prevalence rate of the first permanent molar caries was 47.49% (852/1 794), the mean number of DMFT was 1.30 ± 1.59, the mean number of DMFS was 1.96 ± 3.40, and the filling rate was only 2.35% (20/852). The preva- lence rate and mean DMFT of the first permanent molar caries showed significant difference between different ages and genders (P < 0.05). However, the mean DMFS of the first permanent molar caries only showed significant difference between the various ages (P < 0.05). The prevalence rate of the primary tooth caries was 83.11% (1 491/1 794), the mean number of dmft was 4.82 ± 3.55, the mean number of dmfs was 6.51 ± 5.61, and the filling rate was 12.41% (185/1 491). Caries of primary tooth was the first permanent molar caries risk factor [r = 0.277, OR = 5.736, P = 0.00, 95% CI (4.175, 7.881)]. Significant correlation was found between the caries of primary tooth and first permanent molar (r = 0.274, P < 0.001).

CONCLUSIONCaries status of the first permanent molar among 7- to 9-year-old children in Tangshan city is serious. Caries status of primary tooth may play an important role in predicting the first permanent molar caries in clinic and prevention.

Colorectal cancer is currently the third most common cancer worldwide,and there are still half of the patients undergoing recurrence and metastasis after surgical treatment,so it is necessary for colorectal cancer patients to receive radiation therapy routinely.Due to the side effects brought by radiotherapy,it is of great importance to solve how to minimize the radiation dose in radiation therapy and improve radiation sensitivity.In recent years,people discovered that microRNAs can not only be involved in the origins of colorectal cancer and progress,but also play a increasingly important role in cancer radiosensitivity.MicroRNAs can regulate tumor radiosensitivity by influencing tumor microenvironment and function on target genes.DNA damage response caused by radiation includes the activation of ATM,histone modification and chromatin remodeling,cell cycle arrest,damage repair and apoptosis.microRNAs can regulate tumor radiosensitivity through above processes.This review focuses on the mechanism of microRNAs in affecting DNA damage repair and prospects the future of microRNAs in influencing the sensitivity of cancer radiotherapy in clinical application.

Objective To evaluate the complication rate of secondary surgery in patients with benign thyroid disease. Methods From June 1992 to June 2003, 65 patients underwent reoperation. Operative procedures. pathology and complications were reviewed. Results The first surgery was unilateral in 27 cases (41.5%), bilateral in 38 (58.5%). Reoperation identified carcinoma in 8 cases with complications developed in 8 cases and left over permanent in 1 case (1.5%). Conclusion The complication rate of second operation is higher than that of first thyroid surgery, but still acceptable.