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Objective To evaluate the mechanical responses of human neck tissues under the influence of massage head by modeling and simulation, so as to provide guidance for the design of massage apparatus. Methods Gray images of human tissues under application of message head were obtained through CT scanning, and the three-dimensional (3D) model for these tissues was established with reverse engineering method. Changes in strain, stress and message force of muscles and cervical vertebrae under the application of message head with the radius of 15 mm and 10 mm and pressed depth from 0 mm to 10 mm, as well as its damage and influence to bones and tissues were analyzed by finite element method. Results When 15 mm-radius massage head moved in depth of 6 mm and 7 mm, the maximum local stress was 3.0 MPa and 3.4 MPa, which was beyond damage limit of the vein. In contrast, when 10 mm-radius massage head moved in depth of 6 mm and 7 mm, the maximum local stress was 3.2 MPa and 3.7 MPa, which was beyond damage limit of the vein. To derive 1 MPa stress in cervical spine, the 15 mm- and 10-mm radius massage head should move in depth of 8 mm and 6 mm, respectively. Conclusions To avoid the local tissue damages, the pressed depth of massage should not be greater than 5 mm and 7 mm with the 10 mm- and 15 mm-radius message head, respectively. The message head with a larger radius could produce a larger action range and a more moderate massage force.
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Background and purpose:One of the reasons why cancer cells are resistant to chemotherapy is the existence of cancer stem cells. The purpose of this study was to investigate the chemoresistance of CD44+/CD24+ Siha cells to cisplatin and its mechanisms.Methods:Siha cells were cultivatedin vitro. The CD44+/CD24+ Siha cells were sorted out by fluorescence activated cell sorter (FACS) andin vitro proliferation was detected by MTT assay after treatment with the different concentrations of cisplatin. The cell apoptosis rate was detected by flow cytometry after 10 μg/mL cisplatin acted on CD44+/CD24+ Siha cells for 24, 48 and 72 h. The relative mRNA and protein expressions of Bcl-2, Oct-4 and ABCG2 were detected by quantitative real-time polymerase chain reaction (qRT-PCR) and Western blot, respectively. Results:The survival rates of CD44+/CD24+ Siha cells treated with different concentrations of cisplatin (0.1, 1, 5, 10, 15 and 20 μg/mL) were higher than those of their parental Siha cells [(88.42±1.51)%vs (92.87±1.5)%, (79.94±1.05)%vs (84.72±1.09)%, (69.78±0.81)%vs (75.13±2.86)%, (58.97±0.70)%vs (65.79±2.71)%, (49.60±0.88)%vs (52.10±0.52)%, (45.13±0.69)%vs (48.84±1.02)%,P<0.05]. Compared with their parental Siha cells, the apoptosis rates of CD44+/CD24+ Siha cells were lower after 10 μg/mL of cisplatin acting on them for 24, 48 and 72 h, respectively [(3.05±0.16)%vs (5.17±0.27)%, (17.94±2.02)%vs (32.60±4.28)% and (40.14±3.01)%vs (56.62±5.32)%,P<0.05]. The results from both qRT-PCR and Western blot indicated that Oct-4, ABCG2 and Bcl-2 were highly expressed on CD44+/CD24+ Siha cells. A significant difference was found in Oct-4, ABCG2 and Bcl-2 expression between CD44+/CD24+Siha cells and their parental cells (P=0.015<0.05).Conclusion:CD44+/CD24+ Siha cells could be resistant to apoptosis induced by cisplatin and expressed high levels of cancer stem cell markers such as Oct-4 and ABCG2. This study lays the basis for useful isolation and further targeted therapy of cervical cancer stem cells.
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Objective To explore whether CD44 +/CD24 + expressing cervical cancer cells are resistant to X-ray irradiation and investigate the underlying mechanism.Methods Cervical cancer cell line (Siha) was cultured in vitro and the CD44 +/CD24 + expressing cells were sorted with a flow cytometer.The cells were irradiated with 8,16 and 30 Gy of 6 MV X-rays.Colony formation test was used to evaluate the radiosensitivity of CD44 +/CD24 + expressing cervical cancer cells.Cell morphology was observed by electronmicroscopy,cell apoptosis was analyzed with a flow cytometer and also verified with a DNA ladder assay.Gene expression was determined by RT-PCR.Results After radiation,the ratio of CD44 +/CD24 + cells significantly increased.Compared to Siha cells,the radiosensitivity of CD44 +/ CD24 + cells decreased (t =93.99-400.45,P ＜0.05),and the expressions of bcl-2,survivin and Oct4 mRNA increased in CD44 +/CD24 + cells (t =221.35,941.65,82.27,P ＜0.01).Both apoptotic body and specific DNA ladder pattern were observed in cells but not in the CD44 +/CD24 + Sihacells which had no obvious morphological changes of apoptosis.Conclusions The CD44 +/CD24 + expressing cervical cancer cells are resistant to X-rays due to expression of anti-apoptosis factors.
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Objective To explore the effect of high voltage alternating electric field therapy on fracture healing in rats. Methods An animal model of cortical bone defect was successfully established in the unilateral proximal tibia of 41 rats.They were then randomized into an experimental group (21 rats) and a control group (20 rats).The animals in the experimentsl group were given high voltage alternating electric field therapy for 30 minutes daily,while those in the control group only had sham exposure to the high voltage alternating electric field therapy.Rats in each group were sacrificed at days 7,14,21 and 28 post-operation.After blood collection,the operated tibias of the rats were resected with muscle and other soft tissue removed.Bone mineral density (BMD) of the callus at the fracture point was measured using dual energy X-ray absorptiometry (DEXA).The calluses were then cut down and fixed,decalcificated and sliced for histological observation.At the same time serum osteocalcin ( OC ) and bone alkaline phosphatase (RAP) were also detected by ABC-ELISA. Results The BMD examination showed that callus BMD in the experimental group was significantly higher than in the control group at days 14 and 28.Serum OC and RAP in the experimental group were also higher at days 14 day 21,and OC was still significantly higher in the experimental group at day 28.Histological examination showed that in the early stages of bone healing hematoma absorption and organization appeared earlier in the experimental group than in the control group,with remarkable osteoblast and chondroblast proliferation.While at the later stage,bone trabeculas connection and mineralization also appeared earlier in the experimental group than in the control group. Conclusions High voltage alternating electric field therapy may promote fracture healing by accelerating hematoma absorption and organization,elevating osteoblast proliferation and differentiation as well as promoting extracellular matrix secretion and mineralization.The underlying therapeutic mechanism might be related to the increased expression of OC and RAP caused by exposure to the high voltage alternating electric field.
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ObjectiveTo investigate the expression of estrogen receptor(ER)and progesterone receptor(PR)in intrahepatic cholangiocarcinoma(ICCA)and extrahepatic cholangiocarcinoma(ECCA)comparatively.MethodsThe expression of ER and PR was detected in 24 specimens of ICCA and 34specimens of ECCA by immunohistochemistry assay.ResultsThe positive rates for ER and PR expression were 29 ％(7/24)and 46 ％(11/24)in ICCA specimens,respectively.3 cases among 9 cases of high histological grade,3 cases among 11 cases of middle histological grade and 1 case among 4 cases of low histological grade expressed ER positively,while 2 cases,7 cases and 2 cases expressed PR positively,respectively.The expression of ER and PR expressions showed no statistically significant differences between different histological grades of ICCA.ER and PR were all negative in 34 specimens of ECCA.Conclusion ER and PR show significant different expression between ICCA and ECCA,with exclusive positive expression in ICCA.ER and PR might be involved in the pathogeuesis of ICCA.
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Objective To evaluate the effect of Ganoderma lucidum on drug resistance of the cisplantin-resistant ovarian cancer cell line(A2780CP).Methods The A2780CP cells were randomly divided into control group and test group.The cells in control group and test group were incubated in culture media alone and in culture media containing Ganoderma lucidum 0.5 mg/ml for 48 h respectively.The resistance index(RI) of A2780CP was determined by WST-1 assay.The expression of Akt,Bcl-2 and p53 protein was measured by Western blot.Results The RI was significantly deeressed,the expression of Akt and Bcl-2 protein was down-regulated,while p53 protein expression was up-regulated in test group as compared with control group(P<0.05).Conclusion Ganoderma lueidum can reduce the resistance of A2780 CP cells to cisplantin by down-regulating the expression of Akt and Bcl-2 and up-regulating p53 expression in A2780CP cells.
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Bilingual teaching is the requirement of era development,but how to carry out bilingual teaching in gynecology and obstetrics needs to be explored.An investigation has been conducted in the students of five-year program with a questionnaire,and the bilingual teaching mode in gynecology and obstetrics has been discussed.Then countermeasures to the problems of bilingual teaching in gynecology and obstetrics have been brought forward.
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BACKGROUND: Fibronectin(FN) plays the role of repair in the inflammation. There is no confirmed conclusion whether it can be applied to the refractory corneal epithelial defect.OBJECTIVE: To observe the repair effect of the human plasma FN for the refractory corneal epithelial defect.DESIGN: A controlled experimental study.SETTING: Guangzhou Red Cross Hospital, Guangzhou First People's Hospital, Guangzhou Children's Hospital, Guangzhou Hospital of Traditional Chinese Medicine and Guangzhou Second People's Hos pital.PARTICIPANTS: Totally 383 eyes with the refractory corneal epithelial defect were chosen, of which 309 were in the therapy group, and 74 in the control group.METHODS: The therapy group: Human plasma FN was administered by dropping it into the eyes once every two hours. The controlgroup: 10 g/L celacol M was administered by its dribbling into the eyes once every two hours. Weilesheng was taken orally in both groups, two pills once, three times per day. According to the state of illness, both groups received anti-bacterial or anti-viral treatment and reexamination was given every day or every other day after administration. 10 g/L fluorescein sodium was used to observe the changes of cornea.MAIN OUTCOSE MEASURES: The symptoms, results of staining using fluorescein sodium as well as the corneal epithelial healing of both groups.RESULTS: The symptoms, the results from staining using the fluorescein sodium and the corneal epithelial healing were used for the evaluation. In the therapy group, 309 eyes were followed up and the cure rate was 69.9%. The average therapeutic period was 6.5 days, while those of the control group were 58.1% and 8.7 days respectively. The difference in the curative effect between the two groups was significantly different( P＜0.01 ).CONCLUSION: The application of FN for the refractory corneal epithelial defect displays a more significant effect than conventional treatment.
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0.05).Conclusion:The decreased expressions of IL-18 and ICE in local ovarian cancer Tissues should have certain relation to the occurrence and development of ovarian cancer.
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Objective:To observe effects of Shenkui Decoction on proliferation of ovarian cancer cell.Methods:The Shenkui Decoction- containing rat serum was prepared by using TCM serum pharmacological method,and effects of the drug containing serum on proliferation of ovarian cancer fresh parenchymatous tumor cells were investigated with 3H incorporation method,and effects of the drug-containing serum on proliferation of ovarian cancer cell line Tyk-nu cells were investigated by flow cytometry,cellular activity assay,cellular growth curve assay and cell colony formation rate assay.Results:The drug containing serum could inhibit proliferation of both fresh parenckymatous tumor cells and ovarian cancer cell line Tyk-nu cells,and the inhibitory rate raised with the increase of drug-containing serum content.Conclusion:The Shenkui Decoction-containing rat serum can inhibit proliferation of ovarian cancer fresh parenchymatous tumor cells and ovarian cancer cell line Tyk-nu cells.