Objective To study the effects of mechanical strain on the proliferation of the human pulmonary epithelial cell and the redistribution of its membrane receptors, integrins ? 5 and ? 1. Methods A cyclic strain unit in vitro was designed. The cellular proliferative index was measured by flow cytometry and the redistribution of ? 5 and ? 1 integrins was analyzed in human pulmonary epithelial cell line H727 by laser confocal microscopy. Results The cellular proliferative index reduced significantly after cells were subjected to 15% elongation at frequencies of 20 cycles/min or 40 cycles/min for 24 h. In human pulmonary epithelial H727 cells, ? 5 and ? 1 integrins transferred from the apical layer to the basal layer and formed an adhesion plaque after 24 h exposure to 15% elongation at frequency of 40 cycles/min. Conclusion The results suggest that ? 5 and ? 1 integrins in pulmonary epithelial cells may play an important role in the transduction of mechanical stress.

Objective To observe the survival,conversion and function preservation of mesenchymal stem cells(MSC) after transplantation.Methods MSCs from male Sprague-Dawley(SD) rats were isolated and cultured,then were transplanted to bone defect of female SD rats.Tissues were obtained at defferent periolds.Hybridization in situ was performed on the tissues using Y chromosome specific DNA probe labeled with digoxin to observe the transplanted cells on distribution,quantity and function.Results Allogeneic MSCs could survive and proliferate in the bone defect of recipients and formed bony callus with large quantity and good quality.After 90 days of graft,stem cells still survived and distributed in marrow and newly formed bone tissue.Conclusion After transplantation,allogeneic MSCs have a long-term surviving in marrow and new bone tissue and maintain the characteristic of ossification.

Objective To investigate the correlation between gastric polyps and helicobacter pylori (Hp) infection .Methods 150 patients with gastric polyps(experimental group) and 150 patients with chronic gastritis(control group) from October 2011 to No-vember 2012 in Shapingba people′s hospital of Chongqing were enrolled in this study .The polyps biopsy in patients with gastric polyps and the mucosa in gastric antrum big and small bends ,and the anterior and posterior walls(about 2-5 cm from the pylorus) from both groups were detected for the pathological type ,inflammation degree and stained(modified Giemsa staining) for detection of the existence of Hp .Results In 150 patients with gastric polyps ,58% (87/150) of the cases were infected by Hp mainly in medi-um and low degree ,in which 39 .3% (59/150) of the infection located at polyps and 42% (63/150) of the infection occurred out of polyps .Pathological analysis for this group further demonstrated that the types of hyperplastic polyps ,fundic gland polyps ,inflam-matory polyp and adenomatous polyps accounted for 68 .0% (102 cases) ,20 .7% (31 cases) ,9 .3% (14 cases) and 2 .0% (3 cases) of total 150 gastric polyps cases ,of which 63 .7% (65/102) ,38 .7% (12/31) ,57 .1% (8/14) and 66 .7% (2/3) cases were infected by Hp ,respectively .Pathological analysis also indicated that ,among total 150 gastric polyps cases ,single polyps and multiple polyps types accounted for 62 .0% (93 cases) and 38 .0% (57 cases) .The polyps commonly existed at gastric fundus in which the incidence rate of the hyperplastic polyps type and the fundic gland polyps type were 94 .1% (96/102) and 87 .1% (27/31) ,respectively .The infection rate in hyperplastic polyps was markedly higher than that in fundic gland polyps (P<0 .05) ,and the infection of hyperplas-tic polyps was mainly medium and high degrees .In addition ,the inflammatory response in the hyperplastic polyps was higher ,ac-companied by the intestinal metaplasia and atrophy of gastric mucosa ,as compared with non-hyperplastic polyps .In the total 150 control cases ,52 .0% (78/150) patients were infected by Hp with mainly medium and high degree .Results indicated that there is no relationship between polyps occurring and Hp infection .Conclusion Compared to the chronic gastritis ,there is no positive associa-tion between gastric polyps and Hp infection .There is no remarkable difference for Hp infection rate and degree between the polyps and the non-polyps sites in the stomach .The infection rate and infection degree of hyperplastic polyps is significantly higher than that of fundic polyps .However ,the underlying mechanisms for the development of hyperplastic polyps have to be elucidated in the future .

A processing technique has been developed to prepare acellular bone collagen matrix (ABCM) and ABCM-PDLLA composite materials. The properties of these materials were characterized through several different methods. The histocompatibility of the materials were investigated by ELISA (enzyme linked immunosorbent assay) test and healing the defection of New Zealand white rabbit bilateral radius. The spectroscopy indicated that the major inorganic and organic components of the bone blocks were carbonated hydroxyapatite and collagen respectively,and the fatty and cellular components were. completely eliminated. The test results also revealed that the materials had good mechanical property and well-internnected pore structure, and the addition of PDLLA increased the strength of the materials. The ELISA results demonstrated that the materials had low immunogenicity in short order, and the degree of immune response caused by ABCM was greater than that by ABCM-PDLLA. All of the grafts exhibited good osteoconductive ability and a new bone form after the creeping substitution. In conclusion, two kinds of materials with good histocompatibility have been prepared, and owing to its good mechanical performance and low immunogenicity, ABCM-PDLLA is a better candidate for bone substitute and bone tissue engineering scaffold when compared with single ABCM.
Animals ; Biocompatible Materials ; Bone Substitutes ; chemistry ; Cattle ; Collagen ; chemistry ; Durapatite ; chemistry ; Extracellular Matrix ; chemistry ; Implants, Experimental ; Lactic Acid ; chemistry ; Materials Testing ; Polyesters ; Polymers ; chemistry ; Rabbits ; Random Allocation ; Tissue Engineering ; methods ; Tissue Scaffolds

Objective:To investigate the value of artificial intelligence (AI)-assisted quantitative measurement in evaluation of the dynamic changes of CT for COVID-19 pneumonia.Methods:The clinical and chest CT dynamic imaging data of 99 patients with confirmed COVID-19 pneumonia who were hospitalized in Wuhan Central Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology from January 15, 2020 to March 10, 2020 were retrospectively analyzed. According to the definitive diagnosis, the 99 patients were classified into common ( n=36), severe ( n=33) and critical ( n=30) type, the CT imaging findings of each type were analyzed, including CT basic signs, total volume of pneumonia lesions and percentage of pneumonia lesions of the total lung volume (volume ratio). AI software was used to quantitatively evaluate the dynamic changes of chest CT images. The quantitative indicators included CT peak time of lesions, total volume of lesions peak, volume ratio of lesions peak, maximum growth rate of total volume and maximum growth rate of volume ratio. Kruskal-Wallis rank sum test was used to compare the difference of quantitative indexes between the 3 types, and χ 2 test or Fisher exact probability test was used to compare the difference of qualitative indexes between the 3 types. Sequence measurement and scatter plots were used to show the evolution trend of the volume ratio of the three types of COVID-19 pneumonia lesions. The ROC curve was used to analyze the value of the volume ratio of pneumonia lesions and its maximum growth rate in predicting the conversion of common pneumonia to severe or critical pneumonia. Results:There were statistically significant differences in age and gender distribution among patients with common, severe and critical COVID-19 ( P<0.05), the age of severe and critical types were significantly higher than that of common type ( P<0.01). Compared with common [2.5 (1.0, 5.0) d] and critical type[2.5 (1.0, 4.0) d], the time from onset to the first chest CT scan of severe type was prolonged [5.0 (2.5, 8.0) d, P<0.01]. There were statistically significant differences in involvement of multiple lung lobes (20 cases, 29 cases, 25 cases, χ2=10.403, P=0.006) in patients with common, severe and critical COVID-19 at the first scan, the incidence of the involvement of multiple lung lobes in severe and critical types was significantly higher than that of common type ( P=0.002). The volume ratios of patients with common, severe and critical COVID-19 at the first scan were statistically significant [1.0% (0.2%, 4.7%), 9.30% (1.63%, 26.83%), 2.10% (0.64%, 8.61%), Z=14.236, P=0.001], and the volume ratio of severe type was significantly higher than that of common type ( P<0.001), there was no statistically significant difference between common type and critical type ( P=0.062). Follow-up CT showed that the pneumonia lesions showed a dynamic transformation of progress and recovery, and it was seen that the coexistence of multiphase lesions. The trend line in the scatter plot of the three types of COVID-19 pneumonia lesions showed that the lesions in the advanced stage developed from less to more. The lesion peak volume ratios of the common, severe and critical types were 9.75% (4.83%, 13.18%), 29.80% (23.99%, 42.36%) and 61.81% (43.73%, 72.82%), respectively, the difference was statistically significant ( Z=74.147, P<0.001). The maximum growth rates of lesion volume ratio were 1.27% (0.50%, 1.81%)/d, 4.39% (3.16%, 5.54%)/d and 6.02% (4.77%, 9.96%)/d, respectively, the difference was statistically significant ( Z=52.453, P<0.001). The peak times of lesions were 12.0 (9.0, 15.0) d, 13.0 (10.0, 16.0) d and 16.5 (12.0, 25.0)d, respectively, the difference was statistically significant ( Z=9.524, P=0.009). Taking the volume ratio of pneumonia lesion 22.60% and the maximum growth rate of the volume ratio 1.875%/d as the boundary value, the sensitivity of diagnosing common type to severe or critical type was 92.10% and 96.83%, and the specificity was 100% and 80.56%, respectively. The area under the curve was 0.987 and 0.925, respectively. Conclusions:The lesions of COVID-19 pneumonia show a similar parabolic change on CT imaging. The use of AI technology to dynamitcally and accurately measure the CT pneumonia lesion volume ratio is helpful to evaluate the severity of the disease and predict the development trend of the disease. Patients with a rapid growth of volume ratio are more likely to become severe or critical type.

BACKGROUND:To reduce the amount of bleeding and the amount of hemoglobin after total knee replacement has been a key project in the clinical research in the division of bone and joint. Currently, ice therapy has been widely used in the clinic for tissue sweling and pain due to various physical and chemical factors. OBJECTIVE:To investigate the risk factors of postoperative hemoglobin after total knee replacement and discuss the effects of ice intervention. METHODS: 240 patients with osteoarthritis based on the random draw principles were equaly divided into the treatment group and the control group. The general information, disease status, diagnosis and treatment and prognosis of the two groups were investigated. Al patients were actively subjected to artificial total knee replacement. On the basis of the treatment in the control group, the treatment group received ice intervention at 2 hours after replacement for 7 consecutive days. RESULTS AND CONCLUSION:The postoperative hemoglobin decrease occurred in 34 patients, with the incidence of 14.2% among 240 patients at 7 days after replacement. Multivariate logistic regression analysis results showed that age, no ice treatment, body mass index were the main risk factors for hemoglobin decrease after total knee replacement (P < 0.05). Compared with the control group, the postoperative hemoglobin values of the treatment group were significantly higher (P < 0.05). Hemoglobin decrease values, total blood loss, blood transfusion rate, blood transfusion amount, and pain score at 3 and 7 days after replacement were significantly lower in the treatment group than in the control group (P < 0.05). The knee function excelent and good rate was 96.7% in the treatment group, and 95.8% in the control group, which showed no significant difference (P > 0.05). Results verify that clinical application of total knee replacement facilitated the knee recovery in patients with osteoarthritis, but hemoglobin decrease and bleeding existed. Active ice intervention can reduce the risk and relieve postoperative pain.

Objective:To observe the efficacy of gemcitabine and oxaliplatin combined with targeted drug apatinib in the treatment of gallbladder cancer.Methods:The data of 82 patients with gallbladder cancer who were admitted to Haiyang People's Hospital, Yantaishan Hospital and Rongjun Hospital of Yantai City in Shandong Province from May 2017 to December 2018 were retrospectively analyzed. The patients were divided into control group and observation group according to the medication, with 41 cases in each group. Patients in the control group were treated with gemcitabine combined with oxaliplatin regimen (gemcitabine 1 000 mg/m 2 was injected intravenously for 30 minutes on the 1st and 8th day, and oxaliplatin 100 mg/m 2 was injected intravenously for 3 hours on the 1st day), the observation group was combined with apatinib mesylate 500 mg/d based on the treatment method of the control group. The treatment effect, serum tumor marker levels, adverse reactions and survival were compared between the two groups. Results:The disease control rate of the control group was 70.73% (29/41), which was significantly lower than that of the observation group [92.68% (38/41)] ( χ2 = 6.609, P < 0.05). After treatment, the levels of vascular endothelial growth factor (VEGF), carcinoembryonic antigen (CEA), soluble interleukin-2 receptor (sIL-2R) and Dickkopf-1 in the observation group were significantly lower than those in the observation group, and the differences were statistically significant ( t values were 6.011, 3.048, 4.444, and 4.514, all P < 0.05). The incidence of proteinuria and hand-foot syndrome in the observation group were significantly lower than those in the control group, and the differences were statistically significant ( χ2 values were 6.116 and 4.986, both P < 0.05). During the 1-year follow-up, 2 patients in the observation group died, and the survival rate was 95.13% (39/41); 8 patients in the control group died, and the survival rate was 80.49% (33/41). There was a statistical difference in the survival rate between the two groups ( χ2 = 4.100, P < 0.05). Conclusion:Gemcitabine and oxaliplatin combined with apatinib mesylate are effective in treating gallbladder cancer, which can effectively reduce serum tumor marker levels and improve the prognosis of gallbladder cancer patients.

A process of preparing bovine cortical bone in order to form materials suitable for biomedical xenograft implants was described. Fresh bone samples cut from the middiaphyseal region of bovine femora were obtained from a local slaughterhouse. The bovine bone collagen matrix (BBCM) of various shapes fabricated from bovine bone by defatting and deproteination procedure may be implanted surgically for various purposes. The bone cubes were first defatted in a mixture of defatting agent; subsequently, the samples were extracted to release noncollagenous proteins, followed by digestion using a proteolytic enzyme to remove the telopeptide portions of collagen and residual noncollagenous proteins. Finally,the samples were dried in vacuum, packed and sterilized by gamma irradiation. The bone specimens were characterized by a suite of analytical techniques involving FTIR spectroscopy, X-ray diffraction spectroscopy, differential scanning calorimetry (DSC), uniaxial tension mechanical tests and scanning electron microscopy (SEM). The result showed that BBCM occurred as a white structure with suitable porosity. It contains reasonable proprotion of mineral and organic components in the original osseous architecture of the bovine bone, which is beneficial to keeping the mechanic property and weaker immunogenicity; therefore, it can serve as a potential bone implantable material and extracellular matrix material in bone tissue engineering.
Animals ; Biomimetic Materials ; chemistry ; therapeutic use ; Bone Substitutes ; chemical synthesis ; chemistry ; Bone and Bones ; chemistry ; Cattle ; Collagen ; chemistry ; Extracellular Matrix ; chemistry ; Tissue Engineering ; methods

Objective To investigate the surgical methods and experience of laparoscopic radical cystectomy and orthotopic ileal neobladder for invasive bladder cancer. Methods The clinical data of 14 patients with invasive bladder cancer underwent laparoscopic radical cystectomy and orthotopic ileal neobladder were collected retrospectively during March 2011 and October 2014. Results The 13 patients with invasive bladder cancer were successfully completed laparoscopic radical cystectomy and orthotopic ileal neobladder. 1 case was treated with laparotomy because of unsatisfactory surgery ifeld caused by excessive tumor bleeding. Twelve cases of the urethra-neobaldder anastomosis were completed through the abdominal incision, while for the other 2 cases, the anastomosis was done under the laparoscope, 2 cases were performed neovesicourethral anastomosis using single-needle running sutures through laparoscopy. The median operative time was 444 minutes, the mean intraoperative blood loss was 490 ml. Postoperative pathologic results conifrmed that 12 cases were bladder transitional cell carcinoma (1 case with partial squamous cell carcinoma) and 2 cases with bladder adenocarcinoma. No severe complication occurred except for 2 cases of urinary leakage and 1 case of urinary incontinence. Patients were followed up for 6-56 months,within which 3 patients were died of distant metastasis, 1 case was detected with intracranial metastasis, 1 case was found with urethra-vesical anastomotic stenosis while cured after urethrotomy. Ten cases were well recovered and the mean volume of the neobladder was 300 ml. Conclusions Laparoscopic radical cystectomy and orthotopic ileal neobladder have the advantage of better therapeutic effects, safety, minimal invasion and rapid recovery, which are the preferred therapeutic methods for invasive bladder cancer.

Aim To investigate the effect of curcumin on radiosensitivity of radioresistant nasopharyngeal carcinoma cell line CNE-2R and its mechanism.Methods The concentration of curcumin was screened by MTT assay.Dose-survival curves were obtained according to the colony forming test for L-Q matching and multitarget-single hitting matching,while SF2 and the correlation parameters of radiation biology were calculated.The changes of cell cycle in CNE-2R cells caused by curcumin were also tested by flow cytometry(FCM).The differential expression of genes related to cell cycle and DNA damage repair were detected by RT-qPCR.Results CNE-2R cells could not be inhibited by 10 μmol·L-1 curcumin.Dealt with 10 μmol·L-1 curcumin for 24 h,the value of α/β increased to 1 596 from 6.56;the value of SF2 decreased to 0.361 Gy from 1.93 Gy;the value of N decreased to 1.06 from 1.60;the value of D0 decreased to 2.12 from 3.27;the value of Dq decreased to 0.12 from 1.53.FCM showed that the cells in G2 phase had a significant increase and the cells in S phase had a significant decrease after dealt with 10 μmol·L-1 curcumin for 24 h.The expression of CDK4 was significantly up-regulated and GADD45g,BRCA1 were significantly down-regulated.Conclusion Curcumin radiosensitizes nasopharyngeal carcinoma cell line CNE-2R by changing cell cycle and affecting DNA damage repair through regulating the expression of CDK4,GADD45 g and BRCA1.