Hepatocellular carcinoma （HCC）， as the sixth most common malignant tumor worldwide， poses a serious threat to human health due to its insidious onset and high mortality rate. This article reviews the molecular mechanisms and intervention strategies of gut microbiota （GM） homeostasis in the development and progression of HCC， in order to provide new ideas for the intervention and treatment of HCC. Studies have shown that GM dysbiosis， intestinal leakage， microbial-associated molecular pattern， bacterial translocation， and metabolic products play key roles in the progression of HCC. GM imbalance may lead to immune escape， thereby promoting tumor cell proliferation and metastasis. This article elaborates on the association between GM and HCC， deeply analyzes the mechanism of action of GM in the development and progression of HCC， investigates the role of bile acid-related metabolites， short-chain fatty acid-related metabolites， and other metabolites in HCC， and explores the strategies for targeting GM in the treatment of HCC， including probiotics， prebiotics， antibiotics， Toll-like receptor 4 antagonists， and fecal microbiota transplantation. This article emphasizes that maintaining the integrity of the intestinal barrier and GM homeostasis is of great significance in the prevention and treatment of HCC， which provides a direction for developing new diagnosis and treatment strategies.

Liver macrophages are important immune cells in the liver,and they express proinflammatory factors and anti-inflammatory factors through polarization into M1 type and M2 type,respectively,thereby playing a role in regulating inflammatory damage response.The malignant transformation of hepatic progenitor cells is the core mechanism of the malignant progression of hepatic precancerous lesions,and its key factor is the continuous stimulation of inflammatory microenvironment,which is closely associated with M1/M2 macrophage polarization.This review mainly focuses on the association between macrophage polarization,chronic inflammation,and malignant transformation of hepatic progenitor cells,so as to provide a theoretical basis for the prevention and treatment of hepatic precancerous lesions.

Objective To investigate the effects of prolonged low-dose neutron-γ radiation on peripheral blood lymphocytes of logging workers. Methods The health information of workers in a logging company was collected by on-site blood sample collection and questionnaire survey. Individual doses of γ and neutron radiation were recorded using LiF elements and CR-39, respectively. Lymphocyte count in peripheral blood was measured by blood cytometer. Cell cycle and cyclins were detected by flow cytometry. Results The annual dose of some logging workers exceeded 5 mSv. Lymphocyte counts showed a difference of 15% between the group exposed to the lowest annual dose of 0–1 mSv (mean: 2.45 × 10⁹/L) and the group exposed to the highest annual dose of 5–25 mSv (mean: 2.08 × 10⁹/L). In comparison to pre-shift workers, logging workers exhibited a G1-phase arrest in the lymphocyte cycle, along with increased expression of cyclins p21 and CDK2. Conclusion Prolonged exposure to low-dose neutron-γ radiation leads to reduced lymphocyte counts as well as changes in lymphocyte cycle and cyclin expression.

In order to detect the environmental data of isolated cabin under various environmental conditions,a negative pressure cabin environment detector for aviation was developed,which was composed of a shell,a differential pressure transmitter,a pressure sensor,a carbon dioxide concentration sensor,an oxygen concentration sensor,a temperature and humidity sensor,a data processing module,a liquid crystal display(LCD)screen and USB data interface.It could environmental data such as carbon dioxide concentration,oxygen concentration,temperature,humidity,pressure difference between cabin and outside the cabin and air pressure outside the cabin in real time,the data processing module collected and processed the data,the data and data change curves was displayed in real time by the LCD screen,and the detection data was extracted through the USB data interface.When used in aviation environment,the detector could work continuously without fault for no less than 300 hours,and the average fault repair time was about 30 minutes,with good performance and high detection accuracy,which can provide convenience for the environmental data detection of negative pressure cabins,and is worthy of popularization.

Objective To observe the effects of Xiaomudan Granules on cholesterol synthesis in rats with non-alcoholic fatty liver disease(NAFLD);To explore its mechanism on the treatment of NAFLD based on mTORC1/USP20/HMGCR pathway.Methods Totally 60 SD rats were randomly divided into blank group,model group,Western medicine group(polyene phosphatidylcholine)and TCM low-,medium-and high-dosage groups(Xiaomudan Granules).The blank group was fed with ordinary diet,and the other groups were fed with high-fat diet for 12 weeks to establish NAFLD rat model.After successful modeling,each administration group was given the corresponding drug intragastric administration,and the blank group and model group were given aseptic distilled water intragastric administration for 4 weeks.Body mass and liver mass of rats were recorded,liver index was calculated,and serum alanine aminotransferase(ALT),aspartate aminotransferase(AST),total cholesterol(TC),triglyceride(TG),high density lipoprotein cholesterol(HDL-C),low density lipoprotein cholesterol(LDL-C)contents were detected by automatic biochemical analyzer,the morphological changes of liver tissue were observed by HE staining and oil red O staining,real-time fluorescence quantitative PCR and Western blot were used to detect ribosome S6 kinase(S6K),ubiquitin specific protease 20(USP20),3-hydroxy-3-methylglutaryl CoA reduction enzyme(HMGCR)mRNA and p-S6K,S6K,USP20,HMGCR protein expression in liver tissue.Results Compared with the blank group,the body mass,liver mass and liver index of rats in model group significantly increased(P<0.01,P<0.05),the volume of liver lobe increased,the edge was blunted;the contents of serum ALT,AST,TC,TG and LDL-C significantly increased,while HDL-C content significantly decreased(P<0.01);most hepatocytes showed steatosis,significant vacuole and inflammatory infiltration,increased lipid droplets,and significantly increased mRNA expression of USP20 and HMGCR in liver tissue(P<0.01)and protein expressions of p-S6K,USP20 and HMGCR(P<0.01).Compared with the model group,TCM high-dosage group and Western medicine group could significantly decrease body mass,liver mass and liver index of rats(P<0.01,P<0.05),and improve the appearance of liver;decrease the contents of ALT,AST,TC and LDL-C in serum,and increase the content of HDL-C(P<0.01,P<0.05);alleviate hepatocyte steatosis and balloon-like degeneration,reduce lipid droplet deposition,and decrease USP20,HMGCR mRNA and p-S6K,USP20,HMGCR protein expression in liver tissue(P<0.01,P<0.05).Conclusion Xiaomudan Granules may regulate cholesterol synthesis through mTORC1/USP20/HMGCR pathway,and thus play a role in the treatment of NAFLD in rats.

Macropinocytosis, an evolutionarily conserved, actin-dependent form of endocytosis, is involved in various physiological processes, including nutrient absorption, antigen presentation, and cell signaling transduction and migration. Oncogene activation and tumor suppressor inactivation induce macropinocytosis in tumors in the digestive system, involved in tumorigenesis and progression, whereas the inhibition of macropinocytosis slows the aggressive phenotype of digestive system tumors and improves the efficacy of anti-tumor drugs. Macropinocytosis can also be used as a delivery route for anti-tumor drugs. Therefore, macropinocytosis has been widely studied to develop new methods for the treatment of digestive system tumors.This paper reviews the role of macropinocytosis in the body, the regulation of macropinocytosis-related signaling pathway, as well as the mechanism of macropinocytosis in colorectal cancer, pancreatic ductal adenocarcinoma, liver cancer and other digestive system tumors, to provide reference for related researches.

ObjectiveTo establish a multi index fusion hand grip fatigue prediction model to evaluate the power-assisted effect of the glove exoskeleton prototype for extravehicular clothing. MethodsBP neural network algorithm was used to establish a hand fatigue prediction model. The related factors of hand fatigue were determined with isometric grasping fatigue experiment, and the input variables of BP neural network were determined as cylinder diameter, grasping force, grasping duration and root mean square of electromyography. The fatigue data corresponding to variables of each group were obtained through experiments and subjective fatigue measurement scales, and a fatigue evaluation model based on multi-source fusion of BP neural network algorithm was established. The relationship model between fatigue and assistance effect was established, and the assistance effect of the exoskeleton prototype was evaluated through the degree of fatigue relief. ResultsThe correlation coefficient was 0.974 between the predicted results of the model and the target value. Moreover, it effectively predicted the assistance effect of different prototypes. ConclusionThe BP neural network model established by combining the grasping strength, grasping object parameters and human electromyography can predict hand fatigue, which can be used to evaluate the assistance effect of glove exoskeleton and other hand aids.

Hepatocellular carcinoma (HCC) is the most common pathological type of primary liver cancer, with high fatality rate. The pathogenesis of HCC is complex, and the specific occurrence and development mechanism is still in the exploratory stage. CircRNA is a special endogenous noncoding RNA and mainly participates in the regulation of gene expression at the transcriptional and posttranscriptional levels. By regulating gene transcription, it acts as a molecular sponge of miRNA, participates in protein translation, and interacts with RNA binding protein (RBP). CircRNA is involved in the occurrence and development of HCC. Its abnormal expression in HCC cells is related to the pathological characteristics of HCC tissue, regulates the expression of downstream target genes, miRNA and proteins, participates in the proliferation, migration, invasion and apoptosis of HCC cells, and regulates tumor microenvironment and signal pathways, suggesting that circRNA may be a potential novel biomarker and therapeutic target for the diagnosis and prognosis of HCC. This paper reviews the biological mechanism of circRNA, its role in HCC, and research progress in diagnosis and treatment.

"The Expert Group on Tumor Ablation Therapy of Chinese Medical Doctor Association, The Tumor Ablation Committee of Chinese College of Interventionalists, The Society of Tumor Ablation Therapy of Chinese Anti-Cancer Association and The Ablation Expert Committee of the Chinese Society of Clinical Oncology" have organized multidisciplinary experts to formulate the consensus for thermal ablation of pulmonary subsolid nodules or ground-glass nodule (GGN). The expert consensus reviews current literatures and provides clinical practices for thermal ablation of GGN. The main contents include: (1) clinical evaluation of GGN, (2) procedures, indications, contraindications, outcomes evaluation and related complications of thermal ablation for GGN and (3) future development directions.
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Objective:To analyze the longitudinal characteristics of CD4 +T lymphocytes (CD4) among the adult HIV/AIDS on antiretroviral therapy (ART) and the related factors. Methods:A retrospective cohort of adult HIV/AIDS starting ART in Dehong Dai and Jingpo Autonomous Prefecture (Dehong) in 2007-2016 was followed up to December 31, 2018. Group-based trajectory models were utilized to identify CD4 subgroups based on immune recovery (whether and when CD4 reached the average level of >500 cells/μl). The demographics and information at ART baseline were described, and the related factors were analyzed with polytomous logistic regression. The SAS 9.4 software was used for statistical analysis.Results:A total of 7 605 adults with HIV/AIDS were included, of which the median ( P 25, P 75) age at ART were 36 (30,43) years old, 61.0% were male, 42.5% were Han nationality, and 60.8% with the education of primary school or below. The follow-up duration M ( P 25, P 75) was 6.1 (4.1,8.1) years. HIV/AIDS in Dehong showed four CD4 trajectory subgroups from low to high: below the average level, primary recovery to a normal level, full recovery to a moderate level, and normal steady level, accounting for 34.4%, 39.8%, 20.6%, and 5.2%, respectively. When compared with corresponding control groups, age <35 years at ART, female, education of middle school or above, sexual transmission, no opportunistic infection, CD4 ≥200 cells/μl, baseline regimen with tenofovir (TDF) and time from HIV diagnosis to ART <1 year were the related factors facilitating the higher CD4 subgroups. Conclusions:The various CD4 immune recoveries of HIV/AIDS were changing patterns after ART. Starting ART with a high CD4 level was beneficial to CD4 recovery to normal level during the follow-up period. Early initiation of ART and exceptional attention to CD4 immune recovery should be encouraged after the ART.