Objective To study helical CT manifestations of neck lymph node metastasis in thyroid carcinoma.Methods Forty-four patients of neck lymph node metastasis in thyroid carcinoma were performed helical CT scans and were analyzed retrospectively to compare with pathology and operation.CT manifestations mainly included:density,sector and calcification.Results On the one hand,CT manifestations had common character of neck lymph node metastasis;that was low-attenuant center and rim enhancement,on the other hand,CT manifestations showed:(1)thinness-sand and mottle calcification in the metastatic lymph node;(2)metastatic lymph node obvious enhancement.After enhance average density ranged from 28.00~50.54 HU to 62.85~145.78 HU,average density was near or more than 100 HU.Conclusion In metastatic lymph node of thyroid carcinoma,the findings of thinness-sand and mottle calcification suggest malignant tumor in thyroid focal,and metastatic lymph nodes were obviously enhanced;average density of lymph node after enhancement is near or more than 100 HU.

Objective To investigate the effects of inhaled low dose nitric oxide(NO)on lung ischemia-reperfusion injury during flush and delayed 10 min after reperfusion.Methods Sixty health a- dult male Sprague-Dawley rats were randomly allocated to the control and the NO group.Before the donor lung was harvested,the right hilus was clipped for 5 min(clipping test),then blood sample was collected from carotid artery for arterial blood gas analysis as baseline.Lung transplantation was per- formed in a“cuff-like”vessel anastomosis technique.Dynamic compliance(Cdyn)and resistance of airway(Raw)were monitored before operation(baseline)and after 2-h reperfusion.The graft's gas exchange and oxygenation were assessed by“clipping test”after 2-h reperfusion.The lung graft was harvested for measuring wet/dry weight ratio(W/D),the activity of myeloperoxidase(MPO)and in- ducible nitric oxide synthase(iNOS),the content of malonyldialdehyde(MDA),and the expression of iNOS gene and protein.Results After 2-h reperfusion,compared to the control group,PaO_2/FiO_2, OI,and Qs/Qt were improved significantly in the NO group(277?91 vs.157?47,P＜0.01;2.67?0.89 vs.4.72?1.48,P＜0.01;21.1?4.57 vs.27.1?2.37,P＜0.01,respectively).The activi- ties of MPO were significantly reduced in NO group(1.80?0.46 vs 3.08?0.65 U/g tissue,P＜0.01).The content of MDA in the lung tissue of NO group was significantly higher than that of the control group(34.8?7.9 vs.20.0?11.2 nmol/mg protein,P＜0.05).Inflammatory cell infiltration was also significantly reduced(P＜0.05).The expression of iNOS gene and protein in the lung tissue of NO group was significantly lower than that of the control group.The activities of iNOS were also significantly reduced in NO group(10.6?10.2 vs 97.8?82.2 nmol?g~(-1)?min~(-1),P＜0.05).The im- munohistochemical positive staining of iNOS was localized in the alveolar epithelial cells and the in- flammatory cells infiltrated in the alveolar spaces and mesenchymal tissue.But there were no signifi- cant differences between two groups in Cdyn,Raw and W/D ratio.Conclusion Inhaled low dose NO might mitigate the intrapulmonary shunt,prevent neutrophil sequestration,inhibit the expression of iNOS gene and protein in isograft,thereby ameliorate ischemia-reperfusion injury and improve the ox- ygenation of the graft.

Objective To investigate the expression of COX-2,MMP-2 and TIMP-2 ,the pathological fea-tures ,and their relationship in breast cancer. Methods The expressions of COX-2 ,MMP-2 and TIMP-2 were deter-mined by S-P immunohistochemical method on tissue chips,which containing 127 cases of breast carcinoma. Results The positive rates of COX-2,MMP-2 and TIMP-2 protein were 81.1 (103/127)% ,96.9(123/127)% and 60.6 (77/127) % respectively;The expression of COX-2 was positively related to auxiliary lymph node metastasis and TNM staging (P<0.01 and P<0.05, respectively), and inversely related to PR expression (P<0.05). Further-more,the expression of COX-2 was positively correlated with MMP-2 (r=0. 290 ,P<0.01). Conclusions The ex-pression of COX-2 might be closely related to the invasion and metastasis of breast cancer and has a close relation-ship with MMP-2. The levels of MMP-2 might be partly regulated by COX-2.

OBJECTIVETo obtain the peptide that specifically binds to human osteosarcoma MG-63 cells from Ph. D. 7TM phage display peptide library.

METHODSHuman osteosarcoma MG-63 cells were used as the target cells with human embryonic kidney 293T cells as the control for screening the peptide from Ph. D. 7TM phage display peptide library. The enriched specially binding peptides were verified by cell enzyme-linked immunosorbent assay (ELISA). The location of the peptide in MG-63 cells was investigated using cell fluorescence staining, and targeting of the peptide was tested by organ immunohistochemistry with Osteosarcoma model.

RESULTSThe specifically binding peptides were enriched after 4 rounds of screening. The sequence SLTNLSK was confirmed as the most frequent peptide by DNA sequencing and showed strong specificity verified by cell ELISA, fluorescent staining and organ immunohistochemistry.

CONCLUSIONA peptide that specifically binds to MG-63 cells has been screened from Ph. D. 7TM phage display peptide library to serve as a potential candidate for osteosarcoma-targeting therapy.

Amino Acid Sequence ; Animals ; Bone Neoplasms ; drug therapy ; Cell Line, Tumor ; Drug Screening Assays, Antitumor ; Humans ; Mice ; Mice, Inbred BALB C ; Mice, Nude ; Osteosarcoma ; drug therapy ; Peptide Library ; Peptides ; analysis ; Protein Binding