DNA origami is a powerful technique for generating nanostructures with dynamic properties and intelligent controllability. The precise geometric shapes, high programmability, and excellent biocompatibility make DNA origami nanostructures an emerging drug delivery vehicle. The shape, size of the carrier material, as well as the loading and release of drugs are important factors affecting the bioavailability of drugs. This paper focuses on the controllable design of DNA origami nanostructures, efficient drug loading, and intelligent drug release. It summarizes the cutting-edge applications of DNA origami technology in biomedicine, and discusses areas where researchers can contribute to further advancing the clinical application of DNA origami carriers.

Objective To investigate the clinical effect of Kirschner wire prying assisted reduction in the treatment of extremely unstable humeral supracondylar Gartland ⅢB/Ⅳ type fracture in children. Methods Thirty-seven children patients with diagnosed humeral supracondylar Gartland ⅢB/Ⅳ type fracture in this hospital from September 2021 to August 2022 were selected.After two unsuccessful attempts at manu-al reduction during the operation,the Kirschner wire prying was used to assist in reduction and complete per-cutaneous Kirschner wire fixation.The operation time,fracture healing time,intraoperative ulnar nerve injury,postoperative superficial and deep infection,ossifying myositis and elbow varus deformity were recorded.The function of elbow joint in the affected side was evaluated by the Flynn score in postoperative 6 months. Results All operations in the children patients were successfully completed.No case was converted to open operation and had ulnar nerve injury.The mean operation time was (45.78±10.35)min.All children patients were followed up after the operation.The fracture healing time after the operation in all children patients was 4-6 weeks,with an average time of (5.14±0.67)weeks.No case of superficial and deep infection was found during the postoperative follow-up,and no case of ossifying myositis and elbow varus deformity was found.In the elbow joint Flynn score in postoperative 6 months,there were excellent in 30 cases,good in 6 cases,medi-um in 1 case,the excellent and good rates reached 97％.Conclusion Kirschner wire prying assisted reduction in the treatment of humeral supracondylar Gartland ⅢB/Ⅳ type fracture in children has definite effect,this technique has the advantages of small trauma,simple operation and safety,which is worthy of promotion.

Objective To compare the effects of intraoperative manual reduction and Kirschner wire prying reduction in the treatment of completely displaced supracondylar Gartland type Ⅲ fracture of humerus in children.Methods Forty-four children with completely displaced supracondylar Gartland type Ⅲ fracture of humerus who came to our hospital from September 2021 to April 2022 were selected and randomly divided into the prying group and the manual group,with 22 cases in each group.The operation time,number of intraoperative fluoroscopy,fracture healing time,curative effect 6 months after operation and postoperative complications(infection,ulnar nerve injury,myositis ossificans,elbow inversion deformity)were compared between the two groups.Results All 44 children completed surgery,without incision cases.In the manual group,2 children were dissatisfied with manual reduction after repeated attempts and finally changed to Kirschner wire prying reduction,who were excluded in the follow-up study.The operation time was(39.59±5.59)minutes in the prying group,which was shorter than that of(57.50±9.28)minutes in the manual group;the number of intraoperative fluoroscopy was(7.73±1.98)in the prying group,which was less than that of(15.60±3.20)in the manual group,and the differences were statistically significant(P<0.05).Six months after operation,there was no significant difference in the excellent and good rate of curative effect between the two groups(P>0.05).All the fractures healed from 4 to 6 weeks after surgery.There was no significant difference in the healing time or incidence of postoperative complications between the two groups(P>0.05).Conclusion For completely displaced supracondylar Gartland type Ⅲ fracture of humerus in children,Kirschner wire prying reduction can shorten operation time and reduce intraoperative fluoroscopy,which is a safe,convenient,reliable reduction method with less traumas.

OBJECTIVE: This study assesses the impact of iodine-rich processed foods and dining places on the iodine nutritional status of children. METHODS: School-aged children (SAC) in seven provinces in China were selected by school-based multi-stage sampling. Urinary iodine, salt iodine, and thyroid volume (TVOL) were determined. Questionnaires were used to investigate dining places and iodine-rich processed foods. The water iodine was from the 2017 national survey. Multi-factor regression analysis was used to find correlations between variables. RESULTS: Children ate 78.7% of their meals at home, 15.1% at school canteens, and 6.1% at other places. The percentage of daily iodine intake from water, iodized salt, iodine-rich processed foods, and cooked food were 1.0%, 79.2%, 1.5%, and 18.4%, respectively. The salt iodine was correlated with the urinary iodine and TVOL, respectively (r = 0.999 and -0.997, P < 0.05). The iodine intake in processed foods was weakly correlated with the TVOL (r = 0.080, P < 0.01). Non-iodized salt used in processed foods or diets when eating out had less effect on children's iodine nutrition status. CONCLUSION Iodized salt remains the primary source of daily iodine intake of SAC, and processed food has less effect on iodine nutrition. Therefore, for children, iodized salt should be a compulsory supplement in their routine diet.
Humans ; Child ; Nutritional Status ; Cross-Sectional Studies ; Iodine ; Sodium Chloride, Dietary/analysis* ; China ; Water

Cross-Sectional Studies ; Dietary Supplements ; Female ; Humans ; Iodides ; Iodine ; Nutritional Status ; Pregnancy ; Pregnancy Complications ; Pregnant Women ; Thyroid Gland ; Thyrotropin

Objective:To establish an artificial intelligence (AI)-assisted diagnostic system for lung cancer via deep transfer learning.Methods:The researchers collected 519 lung pathologic slides from 2016 to 2019, covering various lung tissues, including normal tissues, adenocarcinoma, squamous cell carcinoma and small cell carcinoma, from the Beijing Chest Hospital, the Capital Medical University. The slides were digitized by scanner, and 316 slides were used as training set and 203 as the internal test set. The researchers labeled all the training slides by pathologists and establish a semantic segmentation model based on DeepLab v3 with ResNet-50 to detect lung cancers at the pixel level. To perform transfer learning, the researchers utilized the gastric cancer detection model to initialize the deep neural network parameters. The lung cancer detection convolutional neural network was further trained by fine-tuning of the labeled data. The deep learning model was tested by 203 slides in the internal test set and 1 081 slides obtained from TCIA database, named as the external test set.Results:The model trained with transfer learning showed substantial accuracy advantage against the one trained from scratch for the internal test set [area under curve (AUC) 0.988 vs. 0.971, Kappa 0.852 vs. 0.832]. For the external test set, the transferred model achieved an AUC of 0.968 and Kappa of 0.828, indicating superior generalization ability. By studying the predictions made by the model, the researchers obtained deeper understandings of the deep learning model.Conclusions:The lung cancer histopathological diagnostic system achieves higher accuracy and superior generalization ability. With the development of histopathological AI, the transfer learning can effectively train diagnosis models and shorten the learning period, and improve the model performance.

Objective To explore the effect of long noncoding RNA-ATB (LncRNA-ATB) on phenotypic transition and proliferation of human peritoneal mesothelial cells (HPMCs) induced by high glucose.Methods HPMCs used in experiment were divided into three groups:control group,mannitol group and hypertonic glucose group.HPMCs in control group received no treatment,and in hypertonic glucose group and mannitol group were treated with 50mmol/L D-glucose and isotonic mannitol for 72 hours,respectively.Real-time PCR was employed to detect the mRNA expression of LncRNA-ATB,E-cadherin,α-smooth muscle actin (α-SMA),connective tissue growth factor (CTGF),Cyclin D1,cyclin dependent kinase inhibitor 4 (CDK4),protein 27 (p27)and proliferating cell nuclear antigen (PCNA).Western blotting was performed to detect the proteins expression of E-cadherin,α-SMA,CTGF,Cyclin D1,CDK4,p27 and PCNA,and flow cytometry was used to test the cell cycle.Lentivirus artifice was used to up-or down-regulate the expression of LncRNA-ATB in untreated HPMCs.Real-time PCR was employed to detect the mRNA expression of E-cadherin,α-SMA and CTGF,Western blotting was performed to detect the proteins expression of E-cadherin,α-SMA and CTGF,and flow cytometry was used to test the cell cycle.Results It is revealed by Real-time PCR,Western blotting and flow cytometry that the expressions increased of LncRNA-ATB,α-SMA,CTGF,Cyclin D1,CDK4 and PCNA induced by hypertonic glucose,and decreased of E-cadherin and p27 (P＜0.05).Up-regulation of LncRNA-ATB promoted HPMCs phenotypic transition and proliferation,while down-regulation alleviated HPMCs phenotypic transition and proliferation.Conclusion Hypertonic glucose may accelerate HPMCs phenotypic transition and proliferation by up-regulating the expression of LncRNA-ATB.

Objective To compare the complications and outcomes of urgent?start peritoneal dialysis (PD) and hemodialysis (HD) in end?stage renal disease (ESRD) patients, and explore the safety and effectiveness of PD which was as an urgent?start dialysis modality in ESRD patients. Methods All patients for urgent?start dialysis, who initiated dialysis without a long?term dialysis access or had the long?term dialysis access under 30 days in Renji Hospital from January 1st 2013 to December 31st 2014, were enrolled. According to the dialysis modalities, patients were divided into PD group and HD group. Participants were followed up until death, transferred to other centers, lost of follow up or January 1st 2016. Dialysis?related complications within 30 days of implantation, complications of reimplantation and the occurrence of bacteremia between two groups were compared, and their survival rates were tested by Kaplan?Meier curves. Results Among 178 patients in this study, there were 96 (53.9%) patients in PD group and 82 (46.1%) patients in HD group. Compared with those of HD group, patients of PD group presented more cardiovascular disease [21(21.9%) vs 8(9.8%), P=0.029], higher serum potassium [(4.5±0.8) mmol/L vs (4.3±0.8) mmol/L, P=0.038], but less heart failure (NYHA Ⅲ?Ⅳ) [26(30.2%) vs 40 (48.8%), P=0.014], lower brain natriuretic peptide (BNP) [328.5 (129.5, 776.8) ng/L vs 503.5(206.0, 1430.0) ng/L, P=0.008], higher hemoglobin [(81.5 ± 17.7) g/L vs (75.3 ± 22.5) g/L, P=0.039], higher serum albumin (33.5±5.7) g/L vs (31.3±6.7) g/L, P=0.022] and higher serum pre?albumin (304.5±78.0) mg/L vs (257.0 ± 86.1) mg/L, P<0.001]. PD group presented less dialysis?related complications [5 (5.2%) vs 20(24.4%), P<0.001], less dialysis?related complications requiring reimplantation [1(1.0%) vs 20(24.4%), P<0.001] and less bacteraemia [3(3.1%) vs 11(13.4%), P=0.011]. The 3?, 6?and 12?month patient survival rates of PD and HD group were 97.9% vs 98.4%, 97.9% vs 98.4%, and 92.1%vs 93.0% respectively, and no significant difference was found (Log ? rank=0.004, P=0.947). Conclusions Patients with urgent?start PD have less complications within 30 days of implantation and occurrence of bacteremia than patients with urgent?start HD, and the same survival rates. PD may be a feasible and safe urgent?start dialysis modality for ESRD patients.

Objective To analysis the human cytomegalovirus (HCMV)and human T lymphotropic virus(HTLV)infection status in Beijing among voluntary blood donors.Methods Randomly selected 2 010 blood samples from five districts and counties of Beijing City to screen HCMV-IgG,HCMV-IgM and HTLV-Ⅰ/Ⅱ antibody by ELISA method.The positive samples were reexamined two times,two test results of samples were positive that were determined positive by ELISA. HTLV positive samples was confirmed by nested PCR.Results The HCMV-IgM and HCMV-IgG positive rates of Beijing blood donors were 2.19% and 92.59%,screened 1 case of anti-HTLV positive by ELISA method,then confirmed to be neg-ative result by nested PCR.The statistics showed that the HCMV-IgG positive rate female blood donors was higher than male (P <0.05).The positive rates of HCMV-IgM and HCMV-IgG among18~25 years old donors was lowest (P <0.05). Positive rate of HCMV-IgG in college students was lower than other occupation blood donars (P <0.05)and education de-gree was independent of HCMV-IgG,HCMV-IgM positive rates (P >0.05).Conclusion In this investigation,2 010 cases of voluntary blood donors from five districts of Beijing were not found in cases of HTLV infection,HCMV infection was prevalent.

Adolescent ; Adult ; Aged ; Female ; Humans ; Male ; Meningioma ; diagnosis ; Middle Aged ; Retrospective Studies ; Young Adult