Objective To study absorption characteristic of dioscin from Dioscorea nipponica Makino extract in rat intestine.Methods Single-pass intestinal perfusion (SPIP) model was used for rat in situ and HPLC was used to determine the concentrations of dioscin.The effects of different intestinal segments,drug concentration and P-glycoprotein (P-gp) inhibitor on intestinal absorption were investigated.Results Dioscin could be absorbed in the whole intestine,the absorption rate constant (Ka) and the apparent coefficient (Papp) of dioscin decreased following the sequence of ileum > duodenum =jejunum > colon.Absorption parameters of dioscin had no significant difference at different concentrations (40,80,120 mg·L-1).There were significant differences in Ka and Papp values between P-gp inhibitor group and no P-gp inhibitor group(P<0.05).Conclusion The saturate phenomena was not observed under the test range of drug concentration,and the absorption mechanism may be passive diffusion transport.Dioscin in Dioscorea nipponica Makino extract may be the substrate of P-gp.

Air Pollutants, Occupational ; analysis ; Chromatography, Gas ; methods ; Fluorocarbon Polymers ; analysis ; Workplace

BACKGROUND: Research has showed that the abnormal expression of some proteins closely relates to the occurrence and development of cerebral glioma. However, the relationship between the abnormal expression of CyelinD1protein and the occurrence, development and prognosis of glioma is still uncertain which needs further study.OBJECTIVE: To study the expression of CyclinD1 protein in cerebral glioma and relationship between it and the impact of tumor DESIGN: Control study based on pathological specimens.SETTING: Neurosurgery department of a university hospital.PARTICIPANTS: Totally 48 glioma specimens of different malignaut degree were collected from the patients who accepted surgery treatment in Neurosurgery Department of Second Hospital of Xi' an Jiaotong University during January 1990 and December 1995. Twelve normal cerebral specimens were from the non-tumor patients who were conducted intracranial pressure reducing in Neurosurgery Department of Second Hospital of Xi' an Jiaotong University during January 1990 and December 1995.METHODS: S-P immunohistochemical technique was used to detect the abnormal expression of Cyclin D1 protein. Simultaneously, the dyeing results and clinical characters of patients were associated in order to conduct comparison.RESULTS: The positive expression rate of CyclinD1 protein in human cerebral glioma was 54. 12% while in normal cerebral tissue it was about 8.33%. There was significant difference between them(x2 =8. 148 1,P = 0. 004 3 ) . And the positive expression rate in cerebral glioma of low malignancy was 37.04% while in specimens of high malignancy it was 76.19%, there was significant difference (x2 = 7. 294 0, P = 0. 006 9). The positive expression rate of CyclinD1 protein in specimens of patients with long survival period and short survival period after surgery was 70. 37% and 33.33% respectively with significant difference between them (x2 = 6. 5268,P =0.010 6).CONCLUSION: CyclinD1 is closely related to the occurrence and development of human cerebral glioma. It has provided experimental evidence for the prevention to the occurrence of glioma and the estimation of its prognosis by studying the abnormal proliferation of glioma cells targeted on CyclinD1.

Objective To explore application value of blood flow ratio indexes in the diagnosis of Hashimoto's thyroiditis(HT) with different thyroid functions.Methods One hundred and four patients who were diagnosed clinically as HT were enrolled in the study.The patients were classified into three groups according to thyroid functions:the hyperthyroidism group,the hypothyroidism group and the euthyroidism group.Thirty-two volunteers with normal thyroid functions were enrolled as control group.All the cases were examined with ultrasound and five blood flow ratio indexes were calculated automatically.Their differences in the four groups were compared.Results ①Among the five blood flow ratio indexes,three indexes(mean ratio,maxratio and minratio) had significant differences between each two groups(P ＜ 0.001),the other two indexes didn't have any differences among the four groups.②Two receiver operating characteristic (ROC) curves on meanratio were drew:a)HT with hyperthyroidism and HT with euthyroidism;b) HT with euthyroidism and HT with hypothyroidism.The cutoff value as a result of the ROC analysis of HT with hyperthyroidism and HT with euthyroidism was 0.235 with the maxim of specificity and sensitivity.The cutoff value of HT with euthyroidism and HT with hypothyroidism was 0.113 with the maxim of specificity and sensitivity.Both Bland-Altamn scatter diagrams and high intraclass correlation coefficient(ICC) showed that blood flow ratio indexes have high repeatability.Conclusions Blood flow ratio indexes are promising quantitative indexes in reflecting the vascularity of thyroid parenchyma,and they are helpful in the differential diagnosis of HT with different thyroid functions.

Objective To explore diagnosis value of spiral CT on intracranial dermoid cyst based on retrospective analysis.Methods 10 cases of intracranial dermoid cyst were enrolled in and confirmed by surgery and pathology.The retrospective analysis was based on the CT manifestations,causes,pathological and clinical features.Results Among the 10 cases,5 lesions were located in the posterior cranial fossa,3 in besides saddle,1 in up saddle and 1 in the temporal fossa.The morphology of nidus was round or round like with clear boundary.There was no edema around the nidus.Fat was found in 7 cases appeared hypodensity with insufficiency uniformity on CT,and the density was lower than that of cerebrospinal fluid with CT value ranged from-6 HU to 80 HU.There was a few calcification on the edge in 1 case.Hyperdensity irregular and lumpy hair-liked shadow was found in 2 hypodensity cases.1 lesion closed to the cranial plate was compressed thin and buckled.Conclusions Intracranial dermoid cyst has typical CT manifestations.It will be an accurate diagnosis based on clinical analysis and CT manifestations.

·AIM: To evaluate the function of primary human corneal endothelial cells(HCEC) serving as immunological cells. ·METHODS: Expression of HLA-DP, -DQ, -DR, CD40, CD80, and CD86 was determined by immunohistochemical methods. Meanwhile, purified peripheral blood mononuclear cells(PBMC) were cocultured with primary HCEC which were pre-treated with and without γ-IFN respectively; activation of lymphocytes was determined by FACS analysis.·RESULTS: In coculture system, T lymphocyte was activated by primary HCEC, HLA-DP, -DQ, -DR and CD40 expression were increased by γ-IFN induction. Costimulatory molecular CD80 was shown on the endothelial cells. ·CONCLUSION: Primary HCEC were assumed to be involved in the corneal transplantation rejection process as potential antigen presenting cells(APC).

Objective To investigate the predictive value of dose?volume histograms ( DVHs ) of organs at risk ( OARs ) including the bladder, rectum, and small intestine in volumetric modulated arc therapy ( VMAT) plans for cervical cancer. Methods A total of 100 VMAT plans for cervical cancer were assigned into the learning group. The correlation of the anatomical information with the V30 , V40 , and V50 values of the bladder, rectum, and small intestine was evaluated in the group. The support vector regression ( SVR) algorithm was used to establish the correspondence between the anatomical information and the DVHs of OARs. The DVHs of OARs in the verification group containing 20 VMAT plans were predicted based on the anatomical information. Results The DVHs of the bladder, rectum, and small intestine were likely to be influenced mainly by the spatial relationship between these OARs and target volume. In the verification group, the prediction errors of V30,V40 and V50 by SVR algorithm were-2.4%±3. 5%,-2.5%±3. 8%, and-1.5%±4. 9% for the bladder, 0.5%±2. 6%,-1.5%±5. 1%, and-2.0%±7. 4% for the rectum, and-2.9%± 5. 3%, 2.7%±7. 7%, and 5.3%±11. 1% for the small intestine, respectively. Conclusions After learning the correlation between the anatomical information and the DVHs of OARs from prior VMAT plans for cervical cancer, SVR algorithm can precisely predict the DVHs of the bladder, rectum, and small intestine based on the anatomical information.

Type 2 innate lymphoid cells ( ILC2s) are recently identified members of the innate lymphoid cell ( ILC) family. These cells are capable of producing Th2-type cytokines such as IL-5 and IL-13 in response to epithelial cell-derived cytokines IL-25 and IL-33 and play critical roles in allergic diseases such as bronchial asthma. Further investigations on ILC2s will enhance the better understanding of type 2 immune responses and may provide new strategies for the treatment of allergic asthma. In this review, we fo-cus on the origin, location and biological function of ILC2s as well as their possible roles in the pathogenesis of bronchial asthma.

Objective To prepare a redox-responsive doxorubicin-loaded nanoparticle,and to study its in vitro realease behavior and targeting effect on heptoma cells.Methods Cystamine was grafted on the side chains of hyaluronic acid with 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride/N-hydroxysuccinimide catalyst,and then β-cyclodextrin (β-CD) was conjugated on the amine groups of the cystamine by Schiff's base reaction to prepare β-CD modified hyaluronic acid (HACD).The HACD/DOX nanoparticles were prepared by encapsulating DOX into HACD using dialysis method.The drug loading,encapsulation efficiency,particle size and distribution,zeta potential and other physical and chemical properties,as well as in vitro drug release behavior of the HACD/DOX nanoparticles were characterized.The cytotoxicity of HACD/DOX nanoparticles to HepG2 cells was studied by cell counting kit-8 (CCK-8) method.The targeting effect of HACD/DOX nanoparticles on HepG2 cells was studied using flow cytometry and confocal laser scanning microscopy (CLSM).Results HACD were successfully synthesized,which could carry DOX to form uniform homogeneous nanoparticles.The drug loading of DOX in the nanoparticles was (16.1±0.2)％ and the encapsulation efficiency was (64.2±0.9)％.The transmission electron microscope images indicated that the shape of the HACD/DOX nanoparticles was homogeneous sphere.The results of granularity analysis showed that the average size of the HACD/DOX nanoparticles was (203.1 ±2.5) nm with a narrow size distribution (PDI =0.202).The zeta potential of the HACD/DOX nanoparticles was (-29.1±0.8) mV.The in vitro release behavior of the nanoparticles exhibited obvious redox-sensitivity.The results of in vitro cytotoxicity showed that the blank carrier material HACD had no obvious toxicity to hepatoma cells,and the HACD/DOX nanoparticles could effectively kill hepatoma cells with the 0.38 μg/ml half maximal inhibitory concentration (IC50) value at 48 h.Flow cytometry and CLSM results demonstrated that the HACD/DOX nanoparticles could target hepatoma cells through the mediating effect of hyaluronic acid.Conclusions The prepared HACD/DOX nanoparticles have suitable particle size,high drug loading and encapsulation efficiency,and can release DOX under the stimulation of reducing agent.These nanoparticles have obvious targeting effect on hepatoma cells,which is expected to be applied as the drug delivery system of hepatocellular carcinoma (HCC) therapy.

Objective To investigate the effect of pyrrolidine dithiocarbamate(PDTC) on monocyte chemotactic protein1 (MCP-1) in rejection of cardiac allograft and its mechanisms.Methods Heterotopic cervical heart transplantation was performed by cuff-technique.The SD rat recipients were randomly divided into 3 groups:AR group (Acute rejection,n =12),both the recipients and donors were without any treatment.CsA group(n =12),the recipients were treated with 10 mg/kg cyclosporine A after transplantation.PDTC group(n =12),the recipients were treated with 100 mg/kg PDTC after transplantation.All the cardiac allografts were harvested at different time post transplantation according to requirements.We studied allograft myocardial fibrosis wih the help of Masson stain,immuno-histo-chemistry and western blot also were used to detect the expression of MCP-1.Results The survival time of the cardiac allografts was significantly longer in PDTC group than in acute rejection group and CsA group(P ＜ 0.01),and myocardial fibrosis of cardiac allografts in PDTC group was significantly decreased (P ＜ 0.01).The IOD in PDTC group was markedly lower than in CsA group (P ＜ 0.01).Conclusion As the inhibitor of NF-κB,PDTC can significantly relieve rejection of cardiac allograft by inhibiting the expression of MCp-1.