ObjectiveTo observe the protective effect of Erchentang （ECT） on SiO₂-induced lung injury in rats and to explore its underlying mechanism. MethodsA rat model of lung injury was established by a single intratracheal instillation of 50 mg·mL^-1 SiO₂ suspension. Thirty male Sprague-Dawley （SD） rats were randomly assigned to five groups： control， model， low and high-dose （4.5 g·kg^-1·d^-1 and 9 g·kg^-1·d^-1， respectively） ECT， and dexamethasone （0.2 mg·kg^-1·d^-1）. All the groups were treated for 4 consecutive weeks. Histopathological alterations in the lung tissue were examined by hematoxylin and eosin （HE） staining. The levels of malondialdehyde （MDA）， superoxide dismutase （SOD）， and glutathione peroxidase （GSH-Px） in the lung tissue were measured through biochemical assays. The expression of key molecules in the nuclear factor erythroid 2-related factor 2 （Nrf2）/heme oxygenase-1 （HO-1） pathway was determined by Real-time fluorescence quantitative polymerase chain reaction （Real-time PCR）， Western blot， and immunofluorescence assay. The primary active components of ECT were identified by ultra-performance liquid chromatography-tandem mass spectrometry （UPLC-MS/MS）， and their binding affinity to Nrf2/HO-1 was assessed by molecular docking. Untargeted metabolomics of the lung tissue was performed based on UPLC-quadrupole time-of-flight mass spectrometry （UPLC-Q-TOF-MS）， and correlation analysis was performed to identify differential metabolites and parameters closely associated with the Nrf2/HO-1 pathway. ResultsCompared with the control group， the model group exhibited a reduction in body weight gain， an increase in lung index， increased MDA content， weakened SOD and GSH-Px activities in the lung tissue， down-regulated mRNA and protein levels of Nrf2 and protein levels of HO-1 and GPX4， and an up-regulated protein level of Keap1 （P<0.05， P<0.01）. Treatment with ECT attenuated the SiO₂-induced decline in body weight （P<0.05）， alleviated inflammatory cell infiltration and silicotic nodule formation in alveoli， and reduced the MDA content and enhanced the SOD and GSH-Px activities in the lung tissue （P<0.05， P<0.01）. UPLC-MS/MS and molecular docking revealed that core components of ECT， such as hesperidin and glycyrrhizic acid， displayed strong binding affinity to Nrf2/HO-1. Molecular biological experiments demonstrated that ECT promoted nuclear translocation of Nrf2， up-regulated the mRNA and protein levels of HO-1 and GPX4， and down-regulated Keap1 expression （P<0.05， P<0.01）. Metabolomic analysis indicated that ECT reversed the SiO₂-induced aberrant expression of metabolites， including linoleic acid and glutamine （P<0.05， P<0.01）. Correlation analysis showed that Nrf2 and HO-1 were positively correlated with SOD and GSH-Px （P<0.05， P<0.01）， but negatively correlated with glutamine and serine （P<0.05， P<0.01）. ConclusionECT may activate the Nrf2/HO-1 pathway through its core active components， thereby regulating oxidative stress and metabolic disorders to ameliorate SiO₂-induced lung injury in rats. This study provides experimental evidence for ECT in the prevention and treatment of occupational lung injury.

Objective:To investigate the effects of influenza A virus(IAV)on macrophages based on expression of cytokines mediated by Janus kinase/signal transducer and activator of transcription(JAK/STAT)pathway,and to further explore the intervention effects of Ma Xing Shigan decoction drug containing serum.Methods:RAW264.7 was divided into control group,JAK/STAT signal pathway activator group,inhibitor group,model group,oseltamivir group,antiviral granule group and Ma Xing Shigan decoction group.Cell samples were collected after the intervention of IAV and subsequent treating of drug-containing serum for 24 and 48 hours.Secretion levels of IL-1β and CXCL2 in supernatant were detected by ELISA.mRNA expression levels of influenza virus Nuclear Pro-tein(NP),JAK1/2 and STAT1 of cells were detected by RT-qPCR.Protein expression levels of JAK1/2 and STAT1 were detected by Western blot,and protein expression levels of p-STAT1 was detected by immunofluorescence.Correlation between protein expression levels of p-STAT1 and secretion of IL-1β and CXCL2 were evaluated by Pearson correlation analysis.Results:Secretion levels of IL-1β and CXCL2,mRNA expression levels of NP,JAK1/2,STAT1,protein levels of JAK1/2,STAT1 and p-STAT1 were increased,and protein levels of p-STAT1 was positively correlated with the secretion of IL-1β and CXCL2.Ma Xing Shigan decoction could down-regulate secretions of IL-1β and CXCL2,mRNA expression levels of NP,JAK1/2 and STAT1,protein expression levels of JAK1,JAK2,STAT1 and p-STAT1.Conclusion:Activation of JAK1/2-STAT1 signal pathway and imbalance of inflammatory factors may be one of the molecular mechanisms of immunopathological damage of macrophages induced by IAV.Ma Xing Shigan decoction may alle-viate pathogenic effects of IAV by regulating this signal pathway.

Building morality and cultivating people is the fundamental task of national education,and the reform of curricu-lum ideological and political teaching is an important way to realize the task.In the practice of curriculum ideological and political edu-cation,curriculum is the carrier,ideological and political is the direction.In order to explore the ideological and political education mode of professional courses and achieve the educational goal of"casting the soul and educating people",the pathogenic biology teach-ing team of Hunan University of Chinese Medicine takes the basic medical course"Basic Immunology and Pathogenic Biology"as breakthrough point,the team excavated ideological and political elements,built a teaching system,reformed teaching methods,ex-plored and innovated in actual teaching according to course characteristics.Therefore,they achieve certain educational results.This paper summarizes and analyzes the practice and thinking in teaching reform,in order to provide some references for the reform and construction of ideological and political education in colleges and universities.

Objective:To observe effect of immunosuppressant cyclophosphamide on"extrapulmonary transmission"of mouse model of influenza virus pneumonia.Methods:BALB/c mice were randomly divided into normal group,virus group,cyclophospha-mide group,virus+cyclophosphamide group.Cyclophosphamide group and virus+cyclophosphamide group were intraperitoneally injected with cyclophosphamide once,24 h afterwards,virus group and virus+cyclophosphamide group were administered nasal influ-enza virus to establish influenza virus infection model,and 3,5,7 days after nasal instillation,lung index,heart index,liver index,spleen index and kidney index were measured by conventional methods;pathological changes of lung tissue,heart tissue,liver tissue,spleen tissue and kidney tissue were observed by HE staining;ELISA was used to detect levels of serum inflammatory cytokines IL-1β,IL-6,TNF-α;RT-qPCR was used to detect influenza virus load and expressions of inflammatory factors IL-1β,IL-6,TNF-α in each tissue.Results:Compared with normal group and virus group,lung index and heart index of mice in virus+cyclophosphamide group were significantly increased(P<0.05 or P<0.01);spleen index was significantly decreased(P<0.05 or P<0.01);lung tissue,heart tissue,liver tissue and spleen tissue showed different degrees of pathological damage;serum inflammatory factor IL-6 level was increased significantly(P<0.05 or P<0.01);lung tissue,heart tissue,liver tissue,spleen tissue and mRNA levels of IAV NP in kidney tissue were significantly increased(P<0.05 or P<0.01);mRNA levels of IL-1β,IL-6 and TNF-α in lung and heart tissues were significantly increased(P<0.05 or P<0.01).Conclusion:Immunosuppressant cyclophosphamide can cause damage to extrapul-monary tissues and organs in a mouse model of influenza virus pneumonia,among which heart damage is the most serious.Cyclophos-phamide is beneficial to establish model of"extrapulmonary transmission"of influenza virus pneumonia.

Objective:To investigate the effects of influenza A virus(IAV)on macrophages based on expression of cytokines mediated by Janus kinase/signal transducer and activator of transcription(JAK/STAT)pathway,and to further explore the intervention effects of Ma Xing Shigan decoction drug containing serum.Methods:RAW264.7 was divided into control group,JAK/STAT signal pathway activator group,inhibitor group,model group,oseltamivir group,antiviral granule group and Ma Xing Shigan decoction group.Cell samples were collected after the intervention of IAV and subsequent treating of drug-containing serum for 24 and 48 hours.Secretion levels of IL-1β and CXCL2 in supernatant were detected by ELISA.mRNA expression levels of influenza virus Nuclear Pro-tein(NP),JAK1/2 and STAT1 of cells were detected by RT-qPCR.Protein expression levels of JAK1/2 and STAT1 were detected by Western blot,and protein expression levels of p-STAT1 was detected by immunofluorescence.Correlation between protein expression levels of p-STAT1 and secretion of IL-1β and CXCL2 were evaluated by Pearson correlation analysis.Results:Secretion levels of IL-1β and CXCL2,mRNA expression levels of NP,JAK1/2,STAT1,protein levels of JAK1/2,STAT1 and p-STAT1 were increased,and protein levels of p-STAT1 was positively correlated with the secretion of IL-1β and CXCL2.Ma Xing Shigan decoction could down-regulate secretions of IL-1β and CXCL2,mRNA expression levels of NP,JAK1/2 and STAT1,protein expression levels of JAK1,JAK2,STAT1 and p-STAT1.Conclusion:Activation of JAK1/2-STAT1 signal pathway and imbalance of inflammatory factors may be one of the molecular mechanisms of immunopathological damage of macrophages induced by IAV.Ma Xing Shigan decoction may alle-viate pathogenic effects of IAV by regulating this signal pathway.

In the context of"Artificial Intelligence(AI)+Education"era,this study introduces the teaching reform and devel-opment path of the course"Fundamentals of Immunology and Pathogenic Biology"by Professor Lu Fangguo's team at Hunan University of Traditional Chinese Medicine.After twenty years of exploration,the course has successfully transitioned from traditional teaching to intelligent teaching,achieving a comprehensive upgrade in educational concepts,teaching methods,and resources.The reform process is divided into three stages:Early exploration,comprehensive reform,and deepening development.It encompasses the construction of a smart teaching platform,the development and promotion of new forms of digital teaching resources,and the deep integration of ideological and political education.This reform has significantly enhanced teaching quality and students'overall competencies,showcasing the innovative spirit of educators.It has gained nationwide recognition and promotion,providing valuable references for the innovation of medical education in the new era.

Building morality and cultivating people is the fundamental task of national education,and the reform of curricu-lum ideological and political teaching is an important way to realize the task.In the practice of curriculum ideological and political edu-cation,curriculum is the carrier,ideological and political is the direction.In order to explore the ideological and political education mode of professional courses and achieve the educational goal of"casting the soul and educating people",the pathogenic biology teach-ing team of Hunan University of Chinese Medicine takes the basic medical course"Basic Immunology and Pathogenic Biology"as breakthrough point,the team excavated ideological and political elements,built a teaching system,reformed teaching methods,ex-plored and innovated in actual teaching according to course characteristics.Therefore,they achieve certain educational results.This paper summarizes and analyzes the practice and thinking in teaching reform,in order to provide some references for the reform and construction of ideological and political education in colleges and universities.

Objective:To observe effect of immunosuppressant cyclophosphamide on"extrapulmonary transmission"of mouse model of influenza virus pneumonia.Methods:BALB/c mice were randomly divided into normal group,virus group,cyclophospha-mide group,virus+cyclophosphamide group.Cyclophosphamide group and virus+cyclophosphamide group were intraperitoneally injected with cyclophosphamide once,24 h afterwards,virus group and virus+cyclophosphamide group were administered nasal influ-enza virus to establish influenza virus infection model,and 3,5,7 days after nasal instillation,lung index,heart index,liver index,spleen index and kidney index were measured by conventional methods;pathological changes of lung tissue,heart tissue,liver tissue,spleen tissue and kidney tissue were observed by HE staining;ELISA was used to detect levels of serum inflammatory cytokines IL-1β,IL-6,TNF-α;RT-qPCR was used to detect influenza virus load and expressions of inflammatory factors IL-1β,IL-6,TNF-α in each tissue.Results:Compared with normal group and virus group,lung index and heart index of mice in virus+cyclophosphamide group were significantly increased(P<0.05 or P<0.01);spleen index was significantly decreased(P<0.05 or P<0.01);lung tissue,heart tissue,liver tissue and spleen tissue showed different degrees of pathological damage;serum inflammatory factor IL-6 level was increased significantly(P<0.05 or P<0.01);lung tissue,heart tissue,liver tissue,spleen tissue and mRNA levels of IAV NP in kidney tissue were significantly increased(P<0.05 or P<0.01);mRNA levels of IL-1β,IL-6 and TNF-α in lung and heart tissues were significantly increased(P<0.05 or P<0.01).Conclusion:Immunosuppressant cyclophosphamide can cause damage to extrapul-monary tissues and organs in a mouse model of influenza virus pneumonia,among which heart damage is the most serious.Cyclophos-phamide is beneficial to establish model of"extrapulmonary transmission"of influenza virus pneumonia.

AIM:This study aims to explore the mechanisms of influenza A virus(IAV)-induced macrophage inflammatory injury based on the interleukin-6(IL-6)/signal transducer and activator of transcription 3(STAT3)signaling loop and investigate the intervention effects of Ma-Xing-Shi-Gan decoction(MXSGD)-medicated serum.METHODS:RAW264.7 and BV2 cells were divided into control,Janus kinase(JAK)/STAT signaling pathway activator,inhibitor,model,oseltamivir,antiviral particle,and MXSGD groups.After IAV modeling and serum interventions,the cells were cultured for 24 and 48 h,and the indicators were detected and analyzed.ELISA,RT-qPCR,Western blot,and immuno-fluorescence assay were used to detect the secretion levels of IL-6 in the cell culture supernatant,IL-6 and STAT3 mRNA expressions,protein expression of STAT3,and expression levels of phosphorylated STAT3(p-STAT3),respectively.Pearson correlation analysis was used to evaluate the correlation between p-STAT3 and IL-6 in the two cell types.A co-cul-ture model of the two cells was constructed,and the secretion levels of IL-6 in the cell culture supernatant was measured.Molecular docking analyses were performed for STAT3 and MXSGD.RESULTS:After IAV simulation,the secretion lev-els of IL-6 in the cell culture supernatant,mRNA expression levels of IL-6 and STAT3,and protein expression levels of STAT3 and p-STAT3 in both cell lines were elevated(P<0.05 or P<0.01).Pearson correlation analysis revealed that p-STAT3 expression was positively correlated with IL-6 expression.The secretion levels of IL-6 in the co-culture model in-creased(P<0.01).MXSGD down-regulated the secretion levels of IL-6 in the cell culture supernatant mRNA,expression levels of IL-6 and STAT3,and protein expression levels of STAT3 and p-STAT3 in two kinds of cells(P<0.05 or P<0.01),and inhibited the secretion levels of IL-6 in co-culture models.STAT3 demonstrated good binding energies for liquiritin,amygdalin,and ephedrine.CONCLUSION:IAV can induce inflammatory injury in macrophages,and its mechanism may be related to activation of the IL-6/STAT3 signaling loop.MXSGD may alleviate the pathogenic effects of IAV by modulating the signaling loop.

In the context of"Artificial Intelligence(AI)+Education"era,this study introduces the teaching reform and devel-opment path of the course"Fundamentals of Immunology and Pathogenic Biology"by Professor Lu Fangguo's team at Hunan University of Traditional Chinese Medicine.After twenty years of exploration,the course has successfully transitioned from traditional teaching to intelligent teaching,achieving a comprehensive upgrade in educational concepts,teaching methods,and resources.The reform process is divided into three stages:Early exploration,comprehensive reform,and deepening development.It encompasses the construction of a smart teaching platform,the development and promotion of new forms of digital teaching resources,and the deep integration of ideological and political education.This reform has significantly enhanced teaching quality and students'overall competencies,showcasing the innovative spirit of educators.It has gained nationwide recognition and promotion,providing valuable references for the innovation of medical education in the new era.