Objective To evaluate the dynamic contrast-enhanced MRI (DCE-MRI)in detecting experimentally induced testicular ischemia. Methods Thirty healthy male New Zealand rabbits were randomly assigned into 6 groups. There were 5 rabbits in each of the following experimental groups: ( 1 ) Normal control, (2) Sham-operated, (3) ischemia of 3 h group, (4) ischemia of 6 h group, (5) ischemia of 12 h group, (6) ischemia of 24 h group. In all experiment groups, the right testis served as the internal control while the left testis served as the experimental side. DCE-MRI for each animal lasts about 10 minutes. Signal enhanced ratios (SERs) of ROI for both sides of each group were calculated by a computer, and parameters of SERs of 30 s, 75 s, 120 s and maximal SER were used for statistical analysis.Time intensity curves (TICs) were made for two sides of each group via Excel 2003 software and classified into 4 types. Statistical analysis was performed to compare the differences of SERs between left and right testis by two independent Kolmogorov-Smirnov test. Results In group I and 2, significant enhancement was observed on both testes of 10 rabbits. The enhancement decreased gradually with the elongation of ischemia in torsion groups. Three cases of type Ⅰ and 2 cases of type Ⅱ were observed in group 1,5 cases of type Ⅰ in group two, 2 cases of type Ⅰ and 3 cases of type Ⅱ b in group three, 2 cases of type Ⅰ and 2 cases of type Ⅱ b in group four, 5 cases of type Ⅱ b in group five and 5 cases of type Ⅲ in group six were noticed in the left testes. And in TICs of right testes, all cases showed TICs of type Ⅰ except 2 cases of type Ⅱ a in group six. In four torsion groups, the values for SER75 of the left side were 0. 084%, 0. 076%, 0.164% and 0.065%, while the right side were 0.255%, 0.410%, 0.586% and 0.302% (P ＜0.05). The values for SER120 in group three, five and six were 0.221% , 0.158% and 0.059% for the left side, and 0.405%,0.522% and 0.207% for the right side(P ＜0.05). The values for MSER in group three, five and six were 0.217% ,0.164% and 0.072% for the left side, and 0.405%, 0.586% and 0.302% for the right side(P ＜0.05). Conclusion DCE-MRI technique may be useful in the diagnosis of testicular torsion, which shows potential in the clinical application.

Objective To compare the relationship between the enzyme‐linked immunosorbent assay(ELISA) reagent and West‐ern blot(WB) confirmation reagent for analyzing the quality lever of human T‐cell lymphotropic virus(HTLV) detection reagent . Methods The WB confirmation reagent was used to detect anti‐HTLV antibody in 156 human serum samples of ELISA prelimina‐ry screening positive .The ELISA cut‐off value(optimal value) was selected by using the two‐graph receiver operating characteristics (TG‐ROC) analytical method .The two‐by‐two table analysis was constructed to analyze the consistency of results detected by the two methods ,moreover the McNemar test was used to evaluate the consistency of detection results .The quality level of HTLV de‐tection reagent was comprehensively evaluated .Results Among 156 serum samples of ELISA preliminary screening positive ,only 40 samples were positive by the WB confirmation ,and other 116 samples were negative .The sensitivity and specificity of ELISA de‐tection reagent obtained by TG‐ROC analysis were 97 .5% and 45 .7% respectively ,the TG‐ROC test also indicated that the detec‐tion results had significant difference between ELISA and WB(P<0 .05) .By adjusting the cut‐off value ,the sensitivity and specific‐ity of ELISA were increased to 88 .8% (parametric method) .In the comparison of the parametric method and the non‐parametric method ,the obtained areas under the curve(AUC) was 0 .923 5(parametric method) ,their results were basically consistent .Conclu‐sion Although above results indicate that the detection results of ELISA reagent are different from those of WB ,but adjusting the cut off value can increase its sensitivity and specificity ,thus increases the reliability of diagnosis result .

Objective:To screen the neutralizing epitope of enterovirus 71 (EV71) and determine the specific minimum amino acid sequence that triggers immunity for providing a theoretical basis for the development of synthetic peptide vaccines.Methods:EV71 neutralizing antibody-specific binding clones were panned and sequenced using a phage display random 12-peptide library to obtain the key sequences of neutralizing epitopes. A series of peptides containing the key sequences with N-terminal acetylation (AC) and C-terminal linking to Keyhole limpet hemocyanin (KLH) were synthesized. Serum samples were collected after immunizing mice with the modified peptides. Then the immunogenicity of the peptides and the neutralizing activity of serum samples were analyzed by Western blot, ELISA and neutralization test.Results:After three rounds of panning, cloning and sequencing, KQEKDL was identified as the key motif. The serum samples collected from the mice immunized with the modified series of peptides containing key motifs had different degrees of binding ability to EV71 and VP1 protein. The serum samples of mice immunized the synthetic peptide containing only the minimum key motif (AC-KQEKDL-KLH) had the strongest response to the other three peptides and EV71 and the highest neutralizing titer.Conclusions:The EV71 neutralizing epitope was successfully screened using the phage display random peptide library. The key motif of KQEKDL might be the specific minimum amino acid sequence that triggered the immune system. This study provides a theoretical basis for better understanding the immune response mechanism, evaluating the immunogenicity of the antigens and further research and development of polypeptide vaccines.

Objective: To evaluate whether simultaneous vaccination with live attenuated polio vaccine affects the immunogenicity of live attenuated rotavirus (RV) vaccine. Methods: Rotarix produced by GlaxoSmithKline was used as the research object. Two doses of Rotarix were orally administered on day 0 and month 1, and oral live attenuated polio vaccine (OPV) was administered on day 0, month 1 and month 2 according to the national vaccination plan. Healthy infants aged 6 to 16 weeks were randomly divided into two groups: interval vaccination group (Rotarix and OPV were vaccinated on different days) and simultaneous vaccination group (Rotarix and OPV were vaccinated on the same day). Serum samples were collected on day 0, month 2 and month 12, and serum RV-IgA was measured by enzyme linked immunosorbent assay. Statistical analysis was performed to evaluate whether there were statistical differences in the seroconversion rate and level distribution of RV-IgA between the two groups. Results: The seroconversion rate of serum RV-IgA in month 2 was 73.84% in the interval vaccination and 63.95% in the simultaneous vaccination group, and the difference between them was statistically significant (P<0.05). The geometric mean concentrations (GMC) of RV-IgA were 97 EU/ml and 90 EU/ml, respectively (P>0.05). Compared with the simultaneous vaccination group, the seroconversion rate and GMC of serum RV-IgA in month 12 were higher in the interval vaccination group, and the differences were statistically significant (P<0.05). Conclusions Simultaneous vaccination with live attenuated polio vaccine would affect the immune response of live attenuated rotavirus vaccine, especially the maintenance of RV-IgA antibody level.

Objective To set up the model of deiodinase ( Dio) 3b-/- zebrafish and to observe the effect of which on embryo development. Methods The zebrafish model of Dio3b-/- was set up by CRISPR-Cas9 gene editing technology, PCR and sequencing was used to confirm the efficiency of deletion. The heart rate of embryos at 48 hours post fertilization was counted. The locomotor activity of 5-7 days post fertilization larve was detected using behavior tracking system. Results The model of Dio3b knockout zebrafish was set up successfully. The heart rate of embryos Dio3b-/- increased ( P＜0. 001) and the locomotor activity of 5-7 days post fertilization larves lacking Dio3b gene increased (P＜0.05) significantly compared with that of wild type control respectively. Conclusion The deletion of zebrafish Dio3b gene results in the phenotype of hyperthyroidism and the model of Dio3b-/- is proper for studying the effect of partial excess thyroid hormone on embryo development.

Objective:To construct a self-management intervention program for patients with adenocarcinoma chemotherapy based on chronic disease trajectory model, and to provide reference for clinical nursing intervention.Methods:From October 2021 to June 2022, a research team was established. Based on the chronic disease trajectory model and self-management theory, through preliminary quantitative research, literature review and semi-structured interview, the first draft of the intervention plan was prepared. 24 experts were selected for two rounds of Delphi expert correspondence consultation to determine the self-management intervention plan for breast cancer patients undergoing chemotherapy based on the trajectory model of chronic disease.Results:The effective questionnaire recovery rates of the two rounds of expert letter consultation were 100%, and the coefficient of expert authority degree was 0.805 and 0.863, respectively. The mean values of importance were 4.21- 4.96 and 4.46 - 5.00, the coefficients of variation were 0.00 - 0.19 and 0.00-0.17, and the Kendall concordant coefficients were 0.123 and 0.149 ( both P<0.01). Finally, the self-management intervention scheme for breast cancer chemotherapy patients based on the trajectory model of chronic disease was constructed, including 3 first-level indicators, 6 second-level indicators and 27 third-level indicators. Conclusions:The self-management intervention program for patients with adenocarcinoma chemotherapy based on chronic disease trajectory model constructed in this study can provide a certain reference for clinical nurses to carry out targeted self-management interventions.

Objective To validate a cell infection-based quantitative RT-PCR for evaluating the potency of rotavirus vaccine. Methods According to the ICH ( the International Council for Harmonization) Harmonised Tripartite Guideline, the method was validated for its specificity, accuracy, precision, linearity and robustness. Results The method had good specificity as it could only amplify and detect the corre-sponding type of rotavirus strain. The recovery rates for determining the potency against rotaviruses of G2, G3 and G4 types were 97％ to 108％. The percent coefficient of variation ( CV) of both intra-plate and in-ter-plate precision was≤2. 62％, while the intraday and interday CV was≤1. 76％ and≤2. 27％, respec-tively. The CV between the two experimenters was≤7. 68％. The linearity range of the method was 4. 4-6. 5 UI for G2 type rotavirus, 3. 9-8. 3 UI for G3 type and 3. 5-8. 1 UI for G4 type. Good robustness was observed using the cells of 140 to 160 generations. Conclusions The cell infection-based quantitative RT-PCR was shown to have satisfactory specificity, accuracy, precision, linearity and robustness, suggesting that it was a suitable method for evaluating the potency of multivalent rotavirus live vaccines.

OBJECTIVETo detect potential mutations in two neonates suspected for Cornelia de Lange syndrome (CdLS).

METHODSPeripheral blood samples from the neonates and their parents were collected and analyzed for CdLS-related genes using targeted sequence capture and next-generation sequencing. Suspected mutations were confirmed by direct Sanger sequencing.

RESULTSThe neonates were found to respectively carry mutations c.7219C to T and p.D2339Lfs*4 of the NIPBL gene, among which the p.D2339Lfs*4 mutation has not been reported previously. No pathogenic mutation was found in other CdLS-related genes including NIPBL, SMC1A, SMC3, RAD21 and HDAC8.

CONCLUSIONThe c.7219C to T and p.D2339Lfs*4 mutations of the NIPBL gene probably account for the disease in both patients.

Objective To investigate the interventional effect and mechanism of a novel ampe-lopsis hydrogel on dampness-heat accumulation syndrome of gouty arthritis.Methods A total of 90 patients with gouty arthritis who met the diagnostic criteria of western medicine and were differentiated as damp-heat accumulation syndrome of traditional Chinese medicine(TCM)were randomly divided into treatment group,control group and blank group,with 30 patients in each group.The blank group was treated with etoricoxib only,the control group was treated with etoricoxib combined with ampelop-sis hydrogel,and the treatment group was treated with etoricoxib combined with external application of ampelopsis hydrogel.The clinical efficacy,time to symptom improvement,safety,comfort,changes in syndrome scores of TCM,serum inflammatory factors[C-reactive protein(CRP),tumor necrosis factor-α(TNF-α),erythrocyte sedimentation rate(ESR)],NF-κB signaling pathway-related pro-teins,Visual Analogue Scale(VAS)scores for pain,and joint mobility were compared among the three groups before and after treatment.Results The total effective rates in the treatment group and control group were 93.33％and 90.00％,respectively,which were higher than 70.00％in the blank group(P＜0.05).The time for improvement of pain,redness,tenderness,and limited joint mobility in the treatment group was shorter than that in the control group and blank group(P＜0.05).After 7 days of treatment,the TCM syndrome score in the treatment group was lower than that in the con-trol group and blank group,and the levels of serum CRP,TNF-α,and ESR and the expressions of NF-κB signaling pathway-related proteins P50 and P65 in the treatment group and control group were lower than those in the blank group(P＜0.05).After 7 days of treatment,the VAS score in the treatment group was lower than that in the control group and blank group,and the comfort score in the treatment group was higher than that in the control group(P＜0.05).There was no significant differ-ence in the incidence of adverse reactions among the three groups(P＞0.05).Conclusion The effect of ampelopsis hydrogel in treating gouty arthritis is better than that of ampelopsis paste,and its mechanism may be related to the regulation of the NF-κB pathway and inhibition of inflammatory fac-tor expression.The hydrogel is easy to use,hygienic,and comfortable,and is expected to become a safe,effective,and convenient external medicine for gouty arthritis.

Objective:To observe the effect of point application-invigorate the spleen and kidney, circulation of blood formula (PA) combined with five-animal exercise (FAE) on improving the nutritional status for asthenia of patients with dialysis, and provide evidence for the rehabilitation treatment of dialysis patients.Methods:According to the random number table method, a total of 80 patients treated with regular dialysis at Department of Nephrology, the Affiliated Hospital of Nanjing University of Chinese Medicine from April 2020 to December 2021 were randomly divided into experimental group and control group, with 40 cases in each group. Participants in the control group received regular dialysis, basic treatment and diet nursing (RBD). Participants in the experimental group received RBD plus PA+FAE. Labaratory test results, Subjective Global Assessment scale score and Traditional Chinese medicine symptom score were measured at baseline and 12-weeks after the intervention. The Fried Frailty scale score was measured at baseline, 4, 8, and 12 weeks after the intervention.Results:The control group aged (54.08 ± 11.34) years old, 23 males, 17 females; the experimental group aged (57.38±9.89) years old, 19 males, 21 females. After 4, 8 and 12 weeks of intervention, the Fried Frailty Scale scores of the experimental group at different time points were 2 (2, 2), 1 (1, 2) and 1 (0, 1), respectively, lower than 3 (2, 4), 2 (2, 3) and 2 (2, 3) of the control group, and the differences in time effect, inter-group effect and interaction effect were statistically significant ( F=105.76, 18.38, 46.67, all P<0.01). Further pairwise comparisons within groups indicated significant differences of Fried Frailty scale scores at different time points ( Z=-2.78, -4.01, -6.08, all P<0.01). After 12-week of intervention, the results of hemoglobin, serum albumin and serum prealbumin were (107.88 ± 15.58) g/L, (39.10 ± 4.92) g/L, and (289.36 ± 72.05) mg/L in the experimental group, respectively, higher than (100.15 ± 17.62) g/L, (36.93 ± 4.72) g/L, (255.63 ± 75.35) mg/L in the control group ( t=-2.08, -2.01, -2.05, all P<0.05). Subjective Overall Assessment scale was found a significant difference between the 2 groups ( χ2=10.91, P<0.01): the number of grade A (good nutrition) and B (mild to moderate malnutrition) were 36 and 4 in the experimental group and 23 and 17 in the control group. Traditional Chinese medicine symptom score was (4.68 ± 2.50) in the experimental group, lower than (9.58 ± 4.40) in the control group ( t=6.13, P<0.01). Conclusions:Point application-invigorate the spleen and kidney and circulation of blood formula combined with five-animal exercise can effectively improve the nutritional status of dialysis patients and reduce the weakness of patients