Analysis of indicators related to visceral fat index based on the random forest model / 中华健康管理学杂志

Objective:To explore indicators related to visceral fat index by constructing a random forest model.Methods:In this cross-sectional study, the laboratory measures and body composition analysis records of 617 hospital employees (in-service and retired) who underwent physical examination in Heilongjiang Provincial Hospital Health Management Center from March to September 2021 were selected. The subjects were divided into a training set ( n=411) and a test set ( n=206) with the ratio of 2∶1. A total of 110 predictors were included in the model. The model was constructed with the training set and was evaluated with the test set. The optimal number of nodes and decision trees were selected to evaluate the prediction performance of the optimal model. And the top 10 relatively important factors were selected for further investigation. The 617 participants were further divided in to groups according to the visceral fat index: the normal or high visceral fat index group, and the differences of the top 10 relatively important factors were further compared between the two groups. Results:The optimal number of nodes of the final random forest model was 39 and the number of decision trees was 300. The accuracy, precision, sensitivity and specificity of the model was 83.3%, 73.9%, 89.4% and 78.7%, respectively. The area under the receiver operating characteristic curve and 95% confidence interval of the model was 0.881 (0.832-0.931). The top 10 relatively important factors in the model were body mass index, gender, age, serum uric acid, red blood cell count, monocyte cell count, C-peptide, carcinoembryonic antigen, glycosylated hemoglobin and glutamyl transpeptidase. There were significant differences in the up-mentioned 10 indicators between the subjects with normal and high visceral fat index (all P<0.05). Conclusions:The random forest model built in this study has good performance in predicting visceral fat index, and visceral fat is related with changes in liver function, pancreas function and immune function.

Effect of cabazitaxel on metastasis and proliferation of lung cancer cell A549 and its mechanism / 中华内分泌外科杂志

Objective:To investigate the effects of cabazitaxel on lung cancer cell metastasis and proliferation and the related mechanisms.Methods:Lung cancer cells A549 were divided into two groups. The experimental group were cultured with a low concentration of 50 μg/ml cabazitaxel, and the control group were cultured with an equal volume of a solution of cabazitaxel. The proliferation ability of the two groups of cells was examined using CCK8 and plate cloning experiments. The migration ability of A459 cells was verified by transwell and cell scratch experiments. The expression levels of MMP2/9, CDK4/6, and P16 protein were detected by Western blotting.Results:Compared with the control group, the cell proliferation ability of the A549 cell was weakened in the experimental group. The plate clone formation rate of the experimental group was 17.5%±2.3%, and A549 cell clone formation rate of the control group was 74.8%±4.5%. The cloning ability was reduced in the experimental group. Western blot results showed that the expression of CDK4/6 in the experimental group was down-regulated and the expression of P16 was up-regulated. The scratch healing percentage of the cells in the experimental group was 56.2%±3.8%, and the scratch healing percentage of the cells in the control group was 86.8%±5.2%. The scratch healing ability of the cells in the experimental group decreased. The transwell results showed that the experimental group had 35±4 cells per field of view, while it was 78±9 in the control group. The cell migration ability of the experimental group was decreased. Western blot results showed that the expression of MMP2/9 in the experimental group was down-regulated.Conclusion:Cabazitaxel leads to a decrease in the metastasis ability of lung cancer cells A549 through the extracellular matrix pathway, and inhibits cell proliferation by up-regulating P16.

Predictive value of 18F-FDG PET/CT for EGFR mutations in patients with lung adenocarcinoma / 中华核医学与分子影像杂志

Objective:To investigate the predictive value of 18F-fluorodeoxyglucose (FDG) PET/CT imaging for the epidermal growth factor receptor (EGFR) mutations in patients with lung adenocarcinoma. Methods:From January 2013 to December 2017, a total of 146 patients (83 males, 63 females, age: (60.2±10.3) years) who were confirmed as lung adenocarcinoma by pathology and were examined by 18F-FDG PET/CT imaging and EGFR mutation testing in Shanxi Cancer Hospital were retrospectively analyzed. The differences of clinical characteristics (age, gender, smoking, tumor diameter, loymph node metastasis, distant metastasis, stage, thyroid transcripition factor-1 (TTF-1), NapsinA, cyiokeratin (CK)-7, Ki-67) and PET/CT parameters (maximun standardized uptake value (SUV max) of the primary tumor (pSUV max), SUV max of lymph node (nSUV max) and SUV max of distant metastasis (mSUV max)) between patients of EGFR mutation and EGFR wild type were analyzed using independent-sample t test, χ2 test and Fisher exact test. The predictors for EGFR mutation were analyzed by logistic regression analysis. The predictive value of pSUV max and pSUV max combined with gender, smoking and tumor diameter was determined by receiver operating characteristic (ROC) curve analysis. Results:There were 46.58%(68/146) patients with EGFR mutations and 53.42%(78/146) patients with wild type. Gender, smoking, lymph node metastasis, tumor diameter, pSUV max, nSUV max, TTF-1, NapsinA and Ki-67 were significantly different between patients with EGFR mutations and those with wild type ( t values: from -3.023 to -2.032, χ2 values: 4.725-33.749, all P<0.05). Female (odds ratio ( OR)=3.236, 95% CI: 1.213-8.779; P=0.029), non-smoker ( OR=4.947, 95% CI: 1.796-13.621; P=0.019), tumor diameter<3.5 cm ( OR=2.750, 95% CI: 1.109-6.818; P=0.001) and pSUV max<9.1( OR=2.960, 95% CI: 1.227-7.141; P=0.016) were predictors of EGFR mutations in lung adenocarcinoma. The area under the curve (AUC) of pSUV max was 0.640 with the specificity of 43.6%(34/78)and the sensitivity of 27.9%(19/68), while the AUC of the four independent factors was 0.83 with the specificity of 71.8%(56/78) and the sensitivity of 83.8%(19/68). Conclusions:pSUV max is associated with mutant EGFR status. Moreover, the combination of pSUV max, gender, smoking and tumor diameter can enhance the predictive value on EGFR mutation status in patients with lung adenocarcinoma.

Purification and optimization of crystallization conditions of oncogenic protein MDM2 / 中国生化药物杂志

Objective To investigate and optimize the condition of purification and crystallization of oncogenic protein MDM2.Methods MDM2 was expressed in E.coli expression system, and purified by Ni-NTA chelating affinity chromatography and molecular sieve chromatography.The secondary structure of purified protein was analyzed by circular dichroism spectroscopy (CD).Then the crystallization condition of MDM2 was screened and optimized by sitting-drop vapor-diffusion method.Results High purity of MDM2 was obtained by Ni-NTA chelating affinity chromatography and molecular sieve chromatography purification.CD analysis indicated the secondary structure of MDM2 was ordered.Protein-crystallisation experiments illustrated that MDM2 was prone to crystallization under lower pH.Conclusion The optimum pH of MDM2 protein crystallization is 5.5, the optimum protein concentration is 10 mg/mL.

Investigation of correlation between real-time ultrasound elastosonography score and autoimmunity in patients with hashimoto thyroiditis / 中国免疫学杂志

Objective:To investigate the correlation between ultrasonic elasticity score ,elasticity coefficient and autoimmune thyroid function in patients with HT ( hashimoto thyroiditis ) .Methods: Used GE LOGIQ3 type Color Doppler Ultrasound Diagnostic System to acquire satisfactory elastosonography from 216 patients with HT,and evaluated the elasticity score and elasticity coefficient;to detecte the thyroid function and the titer of Thyroid peroxidase antibody ( TPOAb ) , Thyroid globulin antibody ( TgAb ) by chemiluminescence ,respectively investigated the correlation between ultrasonic elasticity score , elasticity coefficient and autoimmune thyroid function.Results:Serum Thyroid stimulating hormone (TSH),TGA and TPO in 216 patients with HT increased significantly , TgAb and elastic coefficient were positively correlated , r=0.54 , P<0.01;TgAb and elasticity score were positively correlated , r=0.496 ,P<0.01;TPOAb and elastic coefficient were positively correlated ,r=0.77 ,P<0.01 ,TPOAb and elasticity score were positively correlated,r=0.73,P<0.01.Conclusion: Real-time ultrasound elastography in combination with measurement of autoimmune thyroid function was helpful to diagnosis of HT .

6% Hydroxyethyl Starch 130/4 . 0 Injection Combined with Furosemide Injection in Treatment of 55 Cases of Severe Preeclampsia Complicated by Ascites / 医药导报

Objective To observe the clinical effects of different fluid therapies in treating severe preeclampsia complicated by ascites. Methods Between Jan. 2010 and Dec. 2012, patients with severe preeclampsia complicated by ascites in Shenzhen Maternity and Child Healthcare Hospital were included in this study. The treatment group ( n=55 ) were given intravenous drip of 6% hydroxyl starch 130/0. 4 plus furosemide, and the control group (n=52) received intravenous drip of 5%human serum albumin plus furosemide. The mean arterial pressure, respiratory rate, heart rate, oxyhemoglobin saturation, colloid osmotic pressure, hematocrit and the incidence of acute pulmonary edema were observed and compared between the two groups. Results Twenty-four hours after cesarean section, the mean arterial pressure of the treatment group was significantly lower than that of the control group, whereas heart rate and oxyhemoglobin saturation were significantly higher (all P0. 05). The average duration of edema after treatment was significantly shorter in the treatment group [(2. 43±0. 37) d versus (3. 74±0. 59) d, P<0. 01]. Conclusion 6% hydroxyl starch 130/4. 0 plus furosemide can effectively elevate the colloid osmotic pressure, resolve edema, improve hypovolemia, sustain oxygen supply to the organs and decrease the complication of pulmonary edema in patients with severe preeclampsia complicated by ascites.

Ligation of descending uterine artery and compression sutures at the uterine lower segment for ;postpartum bleeding due to pernicious placenta previa / 中华围产医学杂志

Objective To evaluate the clinical effect of ligation of the descending branch of uterine artery and compression sutures at the lower uterine segment in managing postpartum bleeding due to pernicious placenta previa. Methods Clinical data of 227 patients with pernicious placenta previa, admitted to Shenzhen Maternity and Child Healthcare Hospital between June 2010 and June 2013, were retrospectively analyzed. Eight-two women,who were admitted between June,2010 to December,2011, receiving B-Lynch sutures combined with uterine lower segment packing after delivering the baby and placenta during cesarean section were assigned as the control group. Another 145 cases, who were admitted between January 2012 to June 2013, receiving ligation of the descending branch of uterine artery and compression sutures at the lower uterine segment, were defined as the observational group. Several indicators during and after the operation were compared between the two groups. T-test or Chi-square test were applied for statistics. Results The duration of operation in the observational group was shorter than in the control [(92±26) vs (106±32) min, t=3.579, P<0.01]. The estimated blood loss during the operation, the total blood loss during the first 24 h after delivery and the blood loss during the operation for placenta percreta in the observational group were all lower than in the control [(1 230±481) vs (1 858±632) ml, (1 475±236) vs (2 482±364) ml, and (2 131±515) vs (2 587±498) ml, t=8.413, 25.295 and 6.484, all P<0.01]. The adjusted postoperative hemoglobin values of the observational group were significantly higher than that of control [(82±21) vs (69±19) g/L, t= - 4.634, P<0.01]. Besides, significant differences were found between the observational and control group on the rates of hysterectomy, blood transfusion, and uterine artery embolization [1%(2/145) vs 7%(6/82), 40%(58/145) vs 66%(54/82), 2%(3/145) vs 12%(10/82), χ2=5.408, 13.945 and 9.904, P < 0.05 or 0.01]. The dosage of Carboprost Tromethamine required was smaller in the observational group [(573±104) vs (729±128) μg, t=9.971, P<0.01]. Conclusions Ligation of descending branch of uterine artery and compression sutures in the lower uterine segment during cesarean section in women with pernicious placenta previa is an effective and simple method to control bleeding resulting reduction of blood loss and the hysterectomy rate.

Effects of 17β-estradiol on propofol-induced rat cortical neuroapoptosis / 中国比较医学杂志

Objective To investigate the protective effects and the mechanisms of 17β-estradiol on the propofol-induced neuroapoptosis in primary cultured rat cortical neurons.Methods The neurons were cultured for 7 days and then divided into three groups: vehicle-control group ( treated with equal volume of 20% intralipid ) , propofol-treated group ( treated with 500μmol/L propofol) , and propofol plus 17β-estradiol treated group ( treated with 500μmol/L propofol and 0.1 μmol/L 17β-estradiol).12 hours after the treatment, neuroapoptosis was detected by Hoechst 33258 staining and TUNEL assay, and the levels of Bcl-2, Bax and cleaved caspase-3 proteins were detected by Western blot.Results Compared with the vehicle-control group, the neuroapoptosis increased greatly ( P<0.01 ) , Bcl-2 level reduced ( P <0.01), Bax and cleaved caspase-3 levels increased greatly (P<0.01), and Bcl-2/Bax ratio reduced significantly (P<0.01).Compared with the propofol-treatment group, the neuroapoptosis decreased greatly ( P <0.01), Bcl-2 level increased ( P<0.01 ) , Bax and cleaved caspase-3 levels reduced greatly ( P <0.01 ) , and Bcl-2/Bax ratio increased greatly ( P <0.01 ) . Conclusions 17β-estradiol can protect cortical neurons against propofol-induced cortical neuroapoptosis by regulating the expression of Bcl-2 and Bax.

Effects of over-expression of macrophage migration inhibitory factor on the expression of interleukin-8 and martix metalloproteinase-9 of human cervical cancer SiHa cells / 肿瘤研究与临床

Objective To investigate the effects of macrophage migration inhibitory factor (MIF) overexpression on the expression of interleukin-8 (IL-8),martix metalloproteinase-9 (MMP-9) and invasion of human cervical cancer SiHa cells.Methods Chemical synthesis MIF eDNA gene,designed primer sequence including XhoI and BamHI enzyme sites,MIF gene was amplified by polymerase chain reaction (PCR),constructed eukaryotic expression vector pEGFP-N1/MIF and transfected into SiHa cells using Lipofectamine and won over-expression of MIF.The expression of MIF in supernatant fluid was detected by ELISA,the expression of MIF,IL-8,MMP-9 in both mRNA and protein levels were detected by real-time fluorescence quantitative-PCR and immunocytochemistry respectively.The effect of over-expressed MIF on migration was detected by Boyden small chamber.Results The expression of protein in supernatant fluid transfected with pEGFP-N1/MIF was significantly increased (Fgroup =8267.564,P ＜ 0.01),the expression of MIF,IL-8,MMP-9 in both mRNA and protein in SiHa cells transfected with pEGFP-N1/MIF were significantly increased (F values were 7019.619,2148.094,3303.540,1565.114,2807.300,523.466,P ＜ 0.01),and there was a positive correlation among MIF,IL-8,MMP-9 expression in both mRNA and protein (r values were 0.865,0.895,0.934,0.908,P ＜ 0.01).Invasion ability in SiHa cells transfected with pEGFP-N1/MIF was obviously increased (F=3430.898,P＜ 0.01).Conclusion The over-expression MIF gene in SiHa cells can promote cervical cancer cell invasion and metastasis of ability,which could be associated with the upregulation of IL-8 and MMP-9 expression.

Diagnostic value of magnetic susceptibility weighted imaging in diffuse axonal injury / 中华放射学杂志

Objective To study the diagnostic value of susceptibility weighted imaging (SWI) in diffuse axonal injury (DAI) and investigate the relationship between SWI and clinical prognosis. MethodsTwenty patients (15 males and 5 females) with DAI were included in this study. Routine sequences (T1WI, T2WI and FLAIR) and SWI were performed on a 3.0 T MRI scanner. There were 8 cases whose Glasgow score scale (GCS) ranged from 3.0 to 5.0, 4 cases from 6.0 to 8.0 and 8 from 9.0 to 12.0. The interval time between injury and examination were from 3 hours to 20 days. The number and volume of lesions observed on SWI and routine sequence were compared using Mann-Whitney U-test and paired t-test. Pearson correlation was used to analyze the relationship between the number and volume of all lesions and GCS. Results The lesions showed punctate, beaded, patchy and cord-like hypointense signal with various size on SWI (lesion diameter <2.0 cm). Distribution of lesions was multifocal with clear boundary. Routine MRI scan found a total of 78 lesions, while SWI sequence detected 424 lesions. The number of the lesions found on SWI was more than that on conventional MRI (U=-15.447,P＜0.01). The total volume of the lesions measured on routine MRI and SWI were 19 340 mm3 and 38 042 mm3, respectively. The total volume measured on SWI was more than that on routine MR (t=5.870,P＜0.01). The number and volume of all lesions were negatively correlated with GCS (r=-0.802, -0.767, P＜0.01). Conclusion SWI sequence could find more bleeding lesions than the routine MRI sequences. The number and the volume of the lesions were closely related to GCS. SWI showed high value in the diagnosis and prediction of the prognosis of DAI.