BACKGROUND:Micro-robots have the characteristics of small size,flexibility,and strong targeting,and can complete complex tasks in a single or clustered manner in a narrow environment.With the continuous optimization of materials,preparation processes,and driving approaches,they have shown increasingly important application value in the field of biomedicine. OBJECTIVE:To analyze the application of field-driven micro-robots in medical field and to look forward to their application prospect. METHODS:Using"microrobots,nanorobots,drivers,biomedical,medical"as Chinese keywords and"microrobots,micro-robots,nanorobots,micromachine,microswimmer,medical"as English keywords,WanFang Data and PubMed databases were searched,respectively.The search time range was from January 2010 to January 2024,and a small number of long-term articles were included.Through reading the titles and preliminarily screening the abstracts,the repetitive studies,low-quality journals,and irrelevant literature were excluded.After reading the entire text,66 papers were finally included for review. RESULTS AND CONCLUSION:Field-driven medical micro-robots mainly include magnetic,optical,thermal,ultrasonic,and multi-mixed factor-driven robots.Field-driven robots have been used in intestinal diagnosis,drug targeting therapy,and stem cell therapy.Medical micro-robots are currently only used in a small number of clinical applications,but most of which are still in the theoretical and experimental stages.Medical micro-robots will face many challenges in future,such as large-scale preparation,precise control of micro-robots,recycling or degradation in vivo,whether the materials used will cause adverse reactions to the human body,and the related minimally invasive medical procedures.

Extensive evidence has demonstrated that glucagon-like peptide-1 receptor agonists (GLP-1RAs) can ameliorate obesity. Our previous studies revealed that (Ex-4)₂-Fc, a long-acting GLP-1RA we developed, depends on the leptin pathway to treat obesity. However, the mechanisms linking (Ex-4)₂-Fc and leptin resistance remain largely unclear. To address this question, we explored the mechanism of GLP-1RAs from the perspective of the gut microbiota, as increasing evidence indicates an important link between the gut microbiota and obesity. This study aimed to explore the potential role of the gut microbiota in the treatment of GLP-1RAs. We found that (Ex-4)₂-Fc treatment reshaped obesity-induced gut microbiota disturbances and substantially increased the abundance of Akkermansia muciniphila (Am). In addition, (Ex-4)₂-Fc did not respond well in antibiotic-treated (ATB) Obese mice. Subsequent studies have shown that this defect can be overcome by gavage with Am. In addition, we found that Am enhanced (Ex-4)₂-Fc therapy by producing the metabolite inosine. Inosine regulates the macrophage adenosine A2A receptor (A2A) pathway to indirectly reduce leptin levels in adipocytes Thus, elucidating the role of metabolites in regulating the leptin pathway will provide new insights into GLP-1RAs therapy and may lead to more effective strategies for guiding the clinical use of antidiabetic agents.

Objective:To observe the clinical efficacy of a new type of "firebreak" drainage with skin preservation in the treatment of Fournier's gangrene.Methods:This technique is suitable for patients with perianal necrotizing fasciitis who can tolerate surgery without large area of skin blackness and necrosis. Procedure and key points: (1) The dividing line between inflammatory tissue and normal tissue was determined according to imaging examination and intraoperative exploration; (2) The abscess cavity was cut along the most obvious part of the abscess fluctuation, with a long diameter of 3~4 cm and a short diameter of 1~2 cm; (3) Necrotic tissue was discreetly separated and removed from the main incision to the outer edge of the infection. A fusiform incision was made every 3 to 5 cm, with a long diameter of 2 to 3 cm and a short diameter of 1 cm, and discreetly separated until the normal tissue, and a hose was hung between the adjacent incisions for drainage. (4) Each adjacent edge cut between the stealth separation and hanging hose drainage, forming a "firebreak"; (5) Rinse the wound repeatedly; (6) If the infection invades the rectum, colostomy is performed as required. The case data of 11 patients with perianal necrotizing fasciitis admitted to the Second Affiliated Hospital of Nanjing University of Chinese Medicine from July 2019 to February 2023 were retrospectively analyzed. All patients were treated with emergency surgical debridement by "firebreak" drainage with skin preservation.Results:All 11 cases were cured with 100%. One case underwent multiple operations. The hospitalization time was 11-46 days, with an average of 22 days. The wound healing time was 28-75 days, with an average of 43 days. Except for 1 patient with trauma, all the other patients had no significant anal function injury after surgery. All the 11 patients recovered and were discharged from hospital with a median follow-up of 136 (115-413) days.Conclusions:The "firebreak" drainage based on skin preservation has the advantages of less trauma and faster recovery, and do not cause obvious anal function damage.

Objective:To observe the clinical efficacy of a new type of "firebreak" drainage with skin preservation in the treatment of Fournier's gangrene.Methods:This technique is suitable for patients with perianal necrotizing fasciitis who can tolerate surgery without large area of skin blackness and necrosis. Procedure and key points: (1) The dividing line between inflammatory tissue and normal tissue was determined according to imaging examination and intraoperative exploration; (2) The abscess cavity was cut along the most obvious part of the abscess fluctuation, with a long diameter of 3~4 cm and a short diameter of 1~2 cm; (3) Necrotic tissue was discreetly separated and removed from the main incision to the outer edge of the infection. A fusiform incision was made every 3 to 5 cm, with a long diameter of 2 to 3 cm and a short diameter of 1 cm, and discreetly separated until the normal tissue, and a hose was hung between the adjacent incisions for drainage. (4) Each adjacent edge cut between the stealth separation and hanging hose drainage, forming a "firebreak"; (5) Rinse the wound repeatedly; (6) If the infection invades the rectum, colostomy is performed as required. The case data of 11 patients with perianal necrotizing fasciitis admitted to the Second Affiliated Hospital of Nanjing University of Chinese Medicine from July 2019 to February 2023 were retrospectively analyzed. All patients were treated with emergency surgical debridement by "firebreak" drainage with skin preservation.Results:All 11 cases were cured with 100%. One case underwent multiple operations. The hospitalization time was 11-46 days, with an average of 22 days. The wound healing time was 28-75 days, with an average of 43 days. Except for 1 patient with trauma, all the other patients had no significant anal function injury after surgery. All the 11 patients recovered and were discharged from hospital with a median follow-up of 136 (115-413) days.Conclusions:The "firebreak" drainage based on skin preservation has the advantages of less trauma and faster recovery, and do not cause obvious anal function damage.

Objective:To investigate the relationship between triglyceride glucose index (TyG) and body inflammation.Methods:The data were obtained from a baseline survey in population in Xi'an in natural population cohort study in northwest China established in 2018-2019. Based on TG and FPG, TyG/TyG-BMI was constructed to reflect insulin resistance (IR) in the body, and systemic immune-inflammation index (SII) reflecting inflammation in the body was constructed using neutrophil, lymphocyte, and platelet counts. A logistic regression model was used to explore the relationship between the TyG and the SII.Results:A total of 11 491 subjects were included in the analysis. After adjusting for covariates, each unit increase in the TyG increased the risk of high SII by 21% ( OR=1.21, 95% CI:1.12-1.30). The risk of high SII in the group with the TyG in Q4 was 1.34 times higher than that in the group Q1 ( OR=1.34, 95% CI:1.18-1.52). Both sensitivity analysis and subgroup analysis further confirmed the stability of the association between the TyG and the SII. In the population with a BMI ranging from 18.5 to 23.9 kg/m 2, for every unit increase in the TyG as a continuous variable, the risk for high SII increased by 31% ( OR=1.31, 95% CI:1.18-1.45). As a categorical variable, the risk for high SII in the Q4 group was 1.52 times higher than that in the Q1 group ( OR=1.52, 95% CI:1.27-1.83). In a population with BMIs ranging from 24.0 to 27.9 kg/m 2, for every unit increase in the TyG as a continuous variable, the risk for high SII increased by 20% ( OR=1.20, 95% CI:1.07-1.35), and there was no significant difference when it was a categorical variable. Conclusions:The increase in IR is closely related to the development of inflammation in the body, and BMI may regulate their relationship. Early prevention of elevated IR levels before overweight or obesity may have a positive effect on the control of inflammation in the body.

Cohort study is one of the important research methods in analytical epidemiology because of its clear time sequence relationship, which is better than other observational studies in demonstrating causal association. However, screening diagnosis or other methods are often used to exclude the individuals with outcome events during the enrollment process of the subjects in cohort studies. The accuracy of screening diagnosis and the effectiveness of exclusion will affect the accuracy of the baseline status assessment of the subjects included in the study, which may lead to the causal time sequence reversal of exposure-outcome in the estimation of causal effect. Landmark analysis can be used to control reverse causality by excluding subjects with potentially unknown expose-outcome timing. In this paper, we describe the basic principles and analytical steps of landmark analysis, and use data from the Chinese Longitudinal Healthy Longevity Survey to explore the relationship between physical activity and frailty, and introduce the specific application of landmark analysis for the purpose of facilitating its application and inferring causal effects more accurately in cohort studies.

With completing a baseline survey of a large natural population cohort, conducting regular follow-up has become a key factor in further improving the quality of cohort construction and ensuring its sustainable development. Typical cohort follow-up methods include repeat surveys, routine monitoring, and community-oriented surveillance. However, in practical applications, there are often issues such as high costs, difficulty, and high error rates. Telephone follow-up is an important supplementary method to the methods mentioned above, as it has the characteristics of low cost, fast response, and high quality. However, the with difficult organization, quality control is challenging, response rates are low, and management levels vary widely, which limits its widespread use in large-scale population cohort studies. Given the above problems, this study draws on customer relationship management based on the actual needs of the China Northwest Cohort follow-up. It relies on the REDCap electronic data collection platform to build a telephone follow-up management and quality control system. Targeted solutions are provided for key issues in telephone follow-up implementation, including organizational structure, project management, data collection, and process quality control, to improve the quality control level of telephone follow-up comprehensively and thereby enhance the quality and efficiency of follow-up. We hope to provide standardized follow-up programs and efficient quality control tools for newly established and existing cohort studies.

Objective To investigate the efficacy and safety of transarterial chemoembolization (TACE) combined with camrelizumab and apatinib in the treatment of advanced hepatocellular carcinoma (HCC). Methods From July 2019 to June 2021, 19 patients with advanced HCC who met the inclusion and exclusion criteria in the First Affiliated Hospital of Soochow University were enrolled in this study. All patients received TACE combined with camrelizumab and apatinib. Tumor response was assessed according to Modified Response Evaluation Criteria in Solid Tumors (mRECIST), and adverse events were assessed according to Common Terminology Criteria for Adverse Events (v5.0). The Kaplan-Meier method was used to analyze progression-free survival and overall survival and calculate 95% confidence interval (CI). Results The median follow-up time was 14.0 months for the 19 patients. As of the last follow-up based on mRECIST, 7 patients (7/19, 36.8%) achieved complete response, 9 (9/19, 47.4%) achieved partial response, and 2 (2/19, 10.5%) achieved stable disease. During follow-up, overall objective response rate and overall disease control rate reached 84.2% and 94.7%, respectively; the median duration of response reached 8.0 (3.4-13.0) months, and median progression-free survival reached 9.5 (95% CI : 4.7-14.3) months; the 6-month survival rate reached 100%, and the 12-month survival rate reached 78.9%. Among the 19 patients, 7 (36.8%) experienced serious adverse events. The most common adverse events of all grades included post-embolization syndrome after TACE (17/19, 89.5%), liver injury (14/19, 73.7%), hematologic toxicity (8/19, 42.1%), and proteinuria (8/19, 42.1%). Conclusion TACE combined with camrelizumab and apatinib has marked efficacy and controllable adverse events in the treatment of advanced HCC, which provides a potential new option for the first-line treatment of advanced HCC.

Objective: To investigate the reverse effect and mechanism of IL-12 on chemotherapeutic medicine suppressing the immune function of NK cells. Methods: Purified NK cells were stimulated with PMAplus Ionomycin in the presence or absent of Cisplatin (DDP) and IL-12. The levels of IFN-γ and TNF-α in culture supernatants were detected by enzyme-linked immunosorbent assay (ELISA); The content of IFN-γ and TNF-α, TRAIL (TNF-related apoptosis inducing ligand) and transcription factors including T-bet and p-STAT-4 in NK cells were analyzed by Flow cytometry. The cytotoxicity of purified NK cells (pretreated with/without chemotherapeutics and IL-12 for 48 h) to Jurkat cells was measured by Flow cytometry. Results: Chemotherapeutics significantly inhibited the production of IFN-γ, TNF-α and the expression of TRAILin NK cells, which were significantly reversed by IL-12 (P<0.05 or P<0.01). Further study revealed that chemotherapeutics down-regulated while IL-12 reversed the expression of p-STAT4 to restore cytokine production. In addition, DDP also inhibited but IL-12 recovered the cytotoxicity of NK cells against tumor cells by inducing the expression of TRAIL (P<0.05 or P<0.01). Conclusion: Chemotherapeutics inhibited the cytotoxicity of NK cells and its secretion of cytokines (IFNγ and TNF-α), which were reversed by IL-12 via up-regulating TRAIL and p-STAT-4; this might provide experimental evidence for the clinical application of IL-12 for rebuild the immune function of tumor patients receiving chemotherapy.

Objective:Understanding of subset、memory cell generation、effector function and organ distribution of Th1 cells in vitro and in vivo.Methods:Different stages of polarized Th1 cells are generated from antigen-specific CD4 +T cells.The expression of cell surface markers and intracellular cytokines(IL-2、IFN-? and IL-4) is determined at a single cell level by FACS. Equal numbers of CFSF-labeled naive CD4 +T cells and different stages of Th1 cells are adoptively transferred into mouse.The production of IFN-? and distribution of Th1 memory cells in lymphoid and non-lymphoid organs are measured. Results:Th1 cell populations can be subdivided into several subsets based upon the production of IL-2 and IFN-?. The percentage of IFN-?-producing cells is increased and IL-2-producing cells is decreased following repeatedly stimulation under Th1 culture condition. Moreover,the expression of CD62L on Th1 cells is reduced after activation and differentiation of CD4 +T cells. 2 weeks post-transfer,the frequency of naive CD4 +T cells is comparable from lymph nodes、spleens and lungs,whereas memory Th1 cells are preferentially detected in spleens and lungs and rapidly produce IFN-? following re-exposure to the same antigen.Conclusion:Th1 cell population is composed of distinct subsets of cells. In comparson with naive CD4 +T cells,memory Th1 cells reveal the changes of surface molecule expression、biologic function and distribution in tissues.