Objective To investigate the inhibitory effects of aloin on the growth of Staphylococcus aureus and its virulence factors α-hemolysin in vitro.Methods Broth dilution was used to measure the minimum inhibitory concentration (MIC) of water-soluble aloin on S.aureus.Agar drilling method was used to observe the size of inhibition zone of aloin for S.aureus.Plasma coagulase test was used to detect the changes of S.aureus coagulase and absorbance was measured to detect the changes of hemolytic activity when S.aureus was exposed to aloin.Real time PCR was used to detect the effects of aloin on the expressions of hla and agrA mRNA.Results The soluble aloin inhibited the growth of S.aureus in a dose-dependent manner.The inhibition zone diameter of a standard strain of S.aureus (ATCC 25923) was 21.5 mm with MIC of 12.5 mg/mL and 17 mm for the clinical isolate SA1.5 with MIC of 15 mg/mL.After treated with soluble aloin,the coagulase titers of ATCC 25923 were 16,4 and 2 for 1/2 MIC,1 MIC and 2 MIC respectively compared with titer 32 of the control group without soluble aloin.The expression of α-hemolysin of S.aureus ATCC 25923 was down-regulated by soluble aloin and the hemolytic activity of S.aureus ATCC 25923 with 1/2 MIC,1 MIC and 2 MIC groups were (77.4 ±3.41) ％,(42.2 ± 2.4) ％ and (38.7 ± 2.4) ％ respectively.The expression levels of hla were 0.020 3 (0.019 6,0.028 8),0.011 6(0.010 6,0.013 1) and 0.033 7(0.020 2,0.042 9) respectively in the 1/2 MIC,1 MIC and 2 MIC group respectively,and there were significant differences among the three groups (H =16.807,P ＜ 0.05).The expression levels of agrA was 0.074 6 (0.066 2,0.098 2),0.020 8 (0.012 2,0.032 6) and 0.021 3 (0.010 2,0.029 6) in the 1/2 MIC,1 MIC and 2 MIC group respectively,and there were significant differences among the three groups (H =16.320,P ＜ 0.05).Conclusion Aloin may inhibit the growth of S.aureus and could effectively inhibit the expression of α-hemolysin.

In order to create a novel recombinant human interferon alpha2b (rh-IFN alpha2b) with higher biological activity, we subjected the rational designed sequence of rh-IFN alpha2b to direct evolution by strategy of the combinatorial mutagenesis. The amino acid residues at multiple sites of 52-53-55, 103-107, and 121-125 were simultaneously mutated. The resulted gene of the mutated rh-IFN a2b was cloned into the pET28a and expressed in E. coli BL21 Condon plus (RIL). The anti-virus activity of the novel interferon alpha2b was 9.3 x 10(7) IU/mg, 93 times higher than the wild type (1 x 10(6) IU/mg). The results showed that the multiple point mutation used in this study could effectively combine the site effects of rh-IFN alpha2b and increase its biological activity.
Antiviral Agents ; pharmacology ; Base Sequence ; Combinatorial Chemistry Techniques ; Humans ; Interferon-alpha ; genetics ; pharmacology ; Molecular Sequence Data ; Mutagenesis, Site-Directed ; methods ; Recombinant Proteins ; genetics ; pharmacology

Objective:To explore the clinical characteristics and prognostic influencing factors of multiple primary lung cancer (MPLC), and to construct a prognostic prediction model.Methods:The clinical data and prognostic information of MPLC patients diagnosed by pathological examination included in the Surveillance, Epidemiology, and End Results (SEER) database from January 2010 to December 2020 were retrospectively analyzed. Patients were randomly divided into training and validation sets according to a 7:3 ratio using R software. Survival curves were plotted by using the Kaplan-Meier method and log-rank test was used for comparison between groups. The independent influencing factors of overall survival (OS) of MPLC patients in the training set were screened using univariate and multivariate Cox proportional hazards models, and accordingly, the nomogram predicting the survival rate of patients at 3, 5 and 8 years were plotted. In the training and validation sets, using the actual survival as the gold standard, the receiver operating characteristic (ROC) curves of the constructed models for predicting the patients' 3-, 5- and 8-year OS rates were plotted, the area under the curve (AUC) was obtained, and C-index of the model was analyzed by using R software. The calibration curves of 3-, 5- and 8-year OS rates predicted by the models and the actual OS rates were plotted.Results:A total of 5 495 MPLC patients were included, 3 846 in the training set and 1 649 in the validation set. The differences in the composition of patients of different ages and AJCC stages between the training and validation sets were statistically significant (both P < 0.05), and the differences in the comparison of other clinicopathological characteristics were not statistically significant (all P > 0.05). The results of multivariate Cox regression analysis showed that males (compared with females, HR = 1.256, 95% CI: 1.144-1.379, P < 0.001), age ≥ 70 years old (compared with 50-59 years old, HR = 1.201, 95% CI: 1.030-1.400, P = 0.019), FPLC with pathological types of squamous cell carcinoma or other types (compared with adenocarcinoma, HR = 1.275, 95% CI: 1.137-1.431, P < 0.001; HR = 1.208, 95% CI: 1.041-1.403, P = 0.013), and SPLC with pathological types of squamous cell carcinoma, small cell lung carcinoma, or other types (compared with adenocarcinoma, HR = 1.270, 95% CI: 1.121-1.440, P < 0.001; HR = 1.978, 95% CI: 1.642-2.384, P < 0.001; HR = 1.246, 95% CI: 1.090-1.424, P = 0.001), and AJCC stage Ⅲ and Ⅳ (compared with stage Ⅰ, HR = 1.645, 95% CI: 1.447-1.869, P < 0.001; HR = 2.078, 95% CI: 1.669-2.587, P < 0.001), FPLC without operation (compared with operation, HR = 1.263, 95% CI: 1.038-1.536, P = 0.020), SPLC without operation (operation vs. no operation, HR = 0.680, 95% CI: 0.579-0.799, P < 0.001), FPLC without lymph node dissection or with clearance of 1-3 regional lymph nodes (compared with clearance of ≥4, HR = 1.225, 95% CI: 1.016-1.477, P = 0.034; HR = 1.314, 95% CI: 1.103-1.566, P = 0.002), FPLC with maximum diameter 3-5 cm or >5 cm (compared with <3 cm, HR = 1.181, 95% CI: 1.053-1.324, P = 0.005; HR = 1.232, 95% CI: 1.069-1.420, P = 0.004), and SPLC with maximum diameter 3-5 cm or >5 cm (compared with <3 cm, HR = 1.560, 95% CI: 1.362-1.786, P < 0.001; HR = 1.727, 95% CI: 1.451-2.054, P < 0.001), and FPLC without chemotherapy (chemotherapy vs. no chemotherapy or unknown, HR = 0.744, 95% CI: 0.655-0.845, P < 0.001) were the independent risk factors of patients' poor OS (all P < 0.05). The results of Kaplan-Meier survival analysis showed that the OS of patients with different gender, race, age, two tumor locations, AJCC staging, pathological type of two lung tumors, maximum diameter of two tumors, and whether two tumors were treated surgically or not, and whether two tumors were treated with chemotherapy or not in the training set were compared, and the differences were all statistically significant (all P < 0.05). Based on the independent factors affecting the OS of MPLC patients screened by the results of multivariate Cox regression analysis, nomogram predicting the 3-, 5- and 8-year OS rates of MPLC were plotted. The results of ROC curve analysis showed that the C-index of the training set's nomogram was 0.679 (95% CI: 0.649-0.701), and the AUC values for predicting the 3-, 5- and 8-year OS rates were 0.601, 0.595 and 0.586, respectively; the C-index of the validation set was 0.678 (95% CI: 0.633-0.720), and the AUC values for predicting 3-, 5- and 8-year OS rates were 0.643, 0.631 and 0.626, respectively. The calibration curves showed that the 3-, 5- and 8-year OS rates of patients predicted by the nomogram models in both the training and validation sets were in good agreement with the actual results with a high goodness-of-fit. Conclusions:The established prognostic model has good predictive value and can effectively assess the prognosis of patients.

Conventional 1.5T and 3.0T cardiac MRI(CMRI)had been widely used.The ultrahigh field MR behaved better in image resolution and signal-to-noise ratio.The domestic 5.0T whole-body ultrahigh field MRI had better balance between the field strength and quality in CMRI,which was expected to improve imaging quality and efficiency.The status challenges and future of 5.0T CMRI were reviewed in this paper.

Objective:To investigate the clinical characteristics and management status of children with Turner syndrome (TS) in China.Methods:As a cross-sectional study, 1 089 TS patients were included in the database of the National Collaborative Alliance for the Diagnosis and Treatment of Turner Syndrome from August 2019 to November 2023. Clinical characteristics (growth development, sexual development, organ anomalies, etc.), karyotypes, auxiliary examinations, and treatments were collected and analyzed.Results:Among the 1 089 TS cases, 809 were recorded karyotypes. The karyotype distribution was as follows: 45, X in 317 cases (39.2%), X chromosome structural variants (including partial deletions of p or q arm, ring chromosome, and marker chromosome) in 89 cases (11.0%), 45, X/46, XX mosaicism in 158 cases (19.5%), mosaicism with X chromosome structural variants in 209 cases (25.8%), and presence of Y chromosome material in 36 cases (4.4%). Among the 824 TS cases, the age of diagnosis was 9.7(6.4, 12.2) years, with a height standard deviation score (HtSDS) of -3.1±1.2. Five hundred and fifty three cases underwent growth hormone (GH) stimulation test, and 352 cases (63.7%) had GH peak values <10 μg/L and 75.9% (577/760) had low IGF1 levels, with IGF1 SDS ≤-2 accounting for 38.2% (290 cases). Among 471 cases aged ≥8 years, 132 cases (28.0%) showed spontaneous sexual development (mean bone age (11.0±1.7) years), 10 cases had spontaneous menarche (mean bone age (12.0±2.2) years), and 2 cases had regular menstrual cycles. Common physical features included cubitus valgus (311 cases (28.5%)), neck webbing (188 cases (17.2%)), low posterior hairline (185 cases (17.0%)), shield chest (153 cases (14.0%)), high arched palate (127 cases (11.6%)), short fourth metacarpal (43 cases (3.9%)), and spinal abnormalities (38 cases (3.5%)). Congenital cardiovascular and urogenital anomalies occurred in 91 cases (19.4%) and 66 cases (12.0%)respectively. Abdominal ultrasound in 33 cases (7.2%) indicated fatty liver, hepatomegaly, intrahepatic bile duct stones, and splenomegaly. Among 23 cases undergoing oral glucose tolerance test (OGTT) test, 2 were diagnosed with diabetes mellitus and 4 with impaired glucose tolerance. Following diagnosis, 669 cases (80.7%) received rhGH treatment at a chronological age of (9±4) years and bone age of (8.3±3.2) years. Additionally, 112 cases (19.4%) received sex hormone replacement therapy starting at the age of (14±4) years and bone age of (12.6±1.2) years.Conclusions:The karyotypes of 45, X and mosaicism were most common in Chinese children with TS. The clinical manifestations were mainly short stature and gonadal dysplasia. However, a few TS children could be in the normal range of height, and some cases among those aged of ≥8 years old had spontaneous sexual development. Some exhibited physical features, congenital cardiovascular and urogenital anomalies, and dysfunction of the hypothalamic-pituitary-IGF1 axis. Moreover, a few of them developed impaired glucose tolerance and diabetes mellitus. Following diagnosis, most of the patients received rhGH treatment, and a few of them received sex hormone replacement therapy.