C_3H/10T 1/2 cell line was used for the study of malignant transformation induced by chemical carcinogen-Benzopyren (BP). The results showed that the transformed foci developed in 7—9 weeks after being attacked by BP. The transformed cells separated from the foci lost their ability of post-confluence inhibition of division, and could grow into colony in soft agar medium. The transformed cells have produced sarcoma in situ after inoculation into the immunosuppressed animals. The above results suggest that C_3H/10T(1/2) cell line is very useful for the study of malignant transformation of cells in vitro induced by carcinogens.In chromosome analysis, the changes in number and structure of chromosome in the transformed cells were found. The abnormality of chromosome proved the close relationships between the malignant transformation of cells and the DNA damage induced by chemical carcinogens

Studies were carried out on the incidence of SCE and chromosomal aberrations in primary cultured cells of mouse embryo exposed to ~(60)Co-? rays and/or treated with chemical carcinogen——benzopyrene.Result shows in the cultured cells exposed to ~(60)Co-? rays at 50 rads, as compared wtih controls there was no statistically significant change in the frequencies of the appearance of both SCE and chromosomal aberrations, In the cells, however, exposed at 300 rads, the frequencies of SCE and chromosomal aberrations were about 1.3 and 24 times higher than that in the unirradiated controls respectively. In the cultured cells treated with 0.05?g of benzopyrene per millilitre of culture medium, the frequency of SCE were increased by about 1.8 times of that of the control group, while the change of chromosomal aberrations had no statistical significance.From the above results, it was suggested that SCE was proved to be a sensitive indicator for evaluating the effects of chemical carcinogens. There is a remarkable difference existing between the frequencies of SCE and chromosomal aberrations induced by ionizing radiation and chemical carcinogens. The difference seems to have a certain relation to their differences in carcinogenic mechanism and effects on carcinogenesis.It was noted that there are some advantages to utilize primary cultured cells of mouse embryo as target cells.

In this experiment, primary mixed culture cells of lung and liver derived from new born mouse was made use of target cells, 0.1 ?Ci 3~H-TdR per milliliter medium was added in the culture in order to induce malignant transformation of the cells in the culture. Results of the experiment was that the cells effected by 3~H-TdR had a unlimited growing and formed sarcoma after being inoculated into new born mice immunosuppressed with ATS. It suggested that they had became malignant transformation cells. Results of analysis of chromosome aberrations of the transformed cells, the long arm chromosome was observed in 5% of cells, the metacentric chromosome in 7% of cells, the acentric fregment in 8% of cells. It shows that DNA damage of the cells induced by 3~H-TdR causes their chromosome aberrations and, futhermore, development of malignant cells. The fact that unstable aberrations was Still in sight in the malignant transformation cells suggested that there have been a bit of 3~HTdR left in these cells which kept damaging DNA of the cells.

In this paper we established a method of preparing chromosomes of peritoneal cells and made use of the method for observing the Y-chromosome of marrow and peritoneal cells of female mice which had been irradiated with 850 rad ~(60)Co-?, rays and then transplanted with marrow cells of male mice. The results showed that the chromosome karyotypes of the marrow cells of the female mice were of the XY type of male mice. It means that the marrow cells of the recipients were substituted by those of the donors. At the same time, the chromosome types of the peritoneal cells of the recipients were also of the XY type. It is suggested that the peritoneal cells were derived from the marrow cells.By the use of the method for assaying CFU-C and CFU-S of mouse marrow cells, CFU-C and CFU-S of peritoneal cells of mice were assayed. The result demonstrated that there were a number of CFU-C and CFU-S among the peritoneal cells.On the observation of the cell morphology of CFU-C and CFU-S, it was discovered that CFU-C differentiated mainly into mononuclear phagocytes, while CFUS had the ability to differentiate into erythrocytie series and granulocytic series, which implies that there were some multipotential stem ceils among peritoneal cells of mice.When more than 10~6 peritoneal cells per mouse were transplanted into the mice which had received 850 rad of ~(60)Co-? rays, their life span could be prolonged.It is still a question unsetteled that whether the stem cells in the peritoneal cavity differentiate diroctly into the mononuclear phagocytes or the mononuclear cells in the blood penetrate into the peritoneal cavity and then differentiate into the macrophages.

Objective To evaluate the intervention effect of atorvastatin on the arterial restenosis after intracavitary therapy of the lower extremity atherosclerotic occlusive disease. Methods One hundred and eighteen patients who undertook intracavitary therapy (including Balloon dilation, Stent implantation and endarterectomy, Stent implantation and thrombectomy) in our hospital from January 2008 to January 2010 were divided into two groups randomly,60 cases into the control group,and 58 cases into the atorvastatin group whom were orally medicated with Atorvastatin 20 mg once daily. Blood lipid, C-reactive protein, Intima-media thickness and the patency rate of lower limb artery of two groups were observed and recorded before treatment and at 4 weeks, 12 weeks, 24 weeks after treatment. Results Success rates of intracavitary therapy were 98. 33% (59/60) and 100. 00% (58/58) in the control and atorvastatin group respectively. The patency rate decreased in different degree with time in both groups,which decreased more significantly in the control group but remained relatively stable in the atorvastatin group. By follow up we found that the patency rate in the control group was significantly lower than that of in the Atorvastatin group(77. 96% vs 94. 82% ,P ＜ 0. 01 )at 24 weeks. Blood lipid, C-reactive protein, Intima-media thickness and the patency rate of lower extremity artery of control group increased in different degrees, but with no statistical significance (P＞ 0. 05 ), while these indices began to decrease in atorvastatin group after 4 weeks of medication and were significantly lower than the control group ( P ＜ 0.01 ). Conclusions Atorvastatin has effect on preventing the arterial restenosis after intracavitary therapy of the lower extremity atherosclerotic occlusive disease.

Hereditary leiomyomatosis and renal cell cancer (HLRCC) syndrome is a rare hereditary disease and characterized by cutaneous leiomyoma, uterine leiomyoma and/or renal cell carcinoma, but rarely associated with vena cava embolism. We treated 1 case of HLRCC syndrome patients with inferior vena cava tumor emboli (Mayo grade Ⅳ), confirmed after genetic testing, the patient and her family refused further treatment. The patient died after two months of follow-up after discharge.

Objective:To evaluate the left ventricular myocardial work parameters of the animal models with left bundle branch block (LBBB) and evaluate the effects of LBBB on left ventricular function and motion pattern by pressure-strain loops (PSL) of speckle tracking imaging (STI).Methods:In Twenty-four healthy male beagles, LBBB was induced by radio frequency ablation under anesthesia, and blood pressure was measured at the same time. Electrocardiograms and echocardiography images were acquired before (baseline), 30 minutes after (acute-LBBB) and 3 months after(chronic-LBBB) the creation of LBBB respectively. STI was applied to measure the left ventricular global longitudinal strain (GLS) and obtain the the PSL of each time point to evaluate the left ventricular global and segmental myocardial work parameters.Results:Compared to the baseline, the global work efficiencies(GWE) were obviously reduced ( P<0.05) and global wasted works(GWW) were significantly increased ( P<0.01) in the acute-LBBB and chronic-LBBB, significant differences were observed in GLS between acute-LBBB and baseline( P=0.04). In baseline, the work efficiency (WEsept) and the constructive work (CWsept) in the basal and middle segments of the septal wall were both obviously higher than the corresponding segments of left ventricular lateral wall( P<0.01), while the distribution of the wasted work(WWsept) was opposite( P<0.01). In acute-LBBB, the WEsept of all segments were significantly decreased ( P<0.05), the WWsept were obviously increased( P<0.05), the CWsept of basal segment was significantly reduced( P=0.01), while the wasted work in the basal segment of lateral wall(WWlat) was increased( P=0.04) compared with the baseline. Compared with the acute-LBBB, the WEsept of basal and middle segments were mildly recovery( P=0.03) in chronic-LBBB, but were still lower than the baseline ( P=0.001), the changes of the other myocardial work parameters of septal and lateral wall were similar to the acute-LBBB. Conclusions:Both acute-LBBB and chronic-LBBB can lead to the changes of left ventricular global and segmental myocardial work parameters. The myocardial work parameters of left ventricle can quantitatively analyze the changes of left ventricular function and motion pattern of the LBBB.

This paper reviews the investigation of examining a child without protective equipment exposed to an exceptionally large radiation field, in order to provide a reference for the investigation and handling of similar cases in the future. Based on the analysis of the way of obtaining evidence and the application of law, the authors put forward some suggestions, such as improving the standards, laws, and regulations related to radiation, enhancing the protective facilities, standardizing the law enforcement procedures, and strengthening the publicity and training of radiation hygiene. The health-related rights and interests of the examinees shall be effectively protected.

Objective:To investigate the mechanism by which chronic psychological stress aggravates intestinal barrier damage and promotes the development of enteritis through inhibiting Wnt/β-catenin pathway, so as to provide a new therapeutic strategy for the clinical diagnosis and treatment of inflammatory bowel disease (IBD).Methods:A comorbidity model of chronic psychological stress and enteritis was established using C57BL/6J mice. HE staining was used to analyze the effects of chronic psychological stress on the intestinal pathological damage in mice with enteritis. ELISA was used to detect the expression of proinflammatory cytokines. The ultrastructural changes of colonic cells and the state of intestinal mucus layer were observed under transmission electron microscope and scanning electron microscope. The secretion of mucoprotein 2 (MUC2) and the expression of cell proliferation marker Ki67 were detected by immunofluo rescence staining. The numbers of goblet cells were detected by Alcian blue-periodic acid-Schiff (AB-PAS) staining. Western blot was performed to analyze the expression of tight junction protein between intestinal epithelial cells, β-catenin which was a key protein of Wnt/β-catenin pathway maintaining crypt proliferation, and downstream protein c-myc.Results:The sugar water consumption ratio decreased, but tail suspension immobility time, the swimming immobility time and the expression of corticotropin releasing hormone (CRH) in hypothalamus increased (all P<0.05) in the stress group as compared with those in the control group. Chronic psychological stress promoted weight loss and colonic shortening in mice with enteritis, exacerbated pathological damage and enhanced the release of pro-inflammatory factors. Moreover, increased disappearance of intestinal epithelial microvilli and severe cellular ultrastructural damage were also observed in the stress+ dextran sulfate sodium salt (DSS) group. There was no pathological damage in the control and stress groups. Chronic psychological stress aggravated intestinal barrier injury and inhibited intestinal barrier repair by inhibiting Wnt/β-catenin pathway. Conclusions:In the mouse model of DSS-induced enteritis, chronic psychological stress preconditioning inhibited the Wnt/β-catenin pathway, weakened the repair ability of intestinal epithelium, aggravated the loss of mucus layer of intestinal barrier and the damage of tight junction structure, and promoted the development of enteritis. In the absence of enteritis, chronic psychological stress had no significant effects on the Wnt/β-catenin pathway and the intestinal barrier.

On January 20, 2020, WHO defined the epidemic of novel coronavirus pneumonia as a public health emergency of international concern, and the epidemic attracted worldwide attention. While effectively controlling source of infection, cutting off the route of transmission, and protecting the susceptible population, it is of great importance to reduce the delay in the diagnosis and treatment of patients with acute abdominal disease and ensure normal clinical work. Therefore, with reference to the current diagnosis and treatment protocols and guidelines and the actual situation in Baoding Second Hospital, this article summarizes the experience in outpatient triage, treatment process, operation classification, prevention and control, and ward management for patients with acute biliary tract infection. The analysis shows that the formulation of emergency plans for patients with acute biliary tract infection during the epidemic of novel coronavirus pneumonia can help to differentiate such patients from the patients with novel coronavirus pneumonia and avoid transmission and cross-infection of novel coronavirus during standardized diagnosis and treatment of acute biliary tract infection.