OBJECTIVES: To investigate the protective effects of dexmedetomidine (DEX) against heat stress (HS)-induced oncosis in human skeletal muscle cells (HSKMCs) and its underlying mechanisms. METHODS: A HSKMC model of HS-induced oncosis were established by 43 ℃ water bath for 4 h, and the effects of treatments with 30 μmol/L DEX, ML385 (a Nrf2 inhibitor) +DEX, si-Nrf2+HS, and si-Nrf2+DEX prior to modeling on cell viability was assessed using CCK-8 assay. Oncosis characteristics were evaluated using transmission electron microscopy and Annexin V-FITC/PI flow cytometry. The oxidative stress markers (GSH, GSH-Px, MDA, SOD and ROS), mitochondrial membrane potential, energy metabolism, and inflammatory cytokines (TNF-α, IL-6 and IL-1β) in the cells were quantified using standard kits, and the expressions of porimin, caspase-3 and Nrf2 pathway proteins were analyzed using Western blotting and qRT-PCR. RESULTS: HS induced typical oncotic features in HSKMCs including organelle swelling and cytoplasmic vacuolization. DEX pretreatment significantly attenuated these changes, reduced Annexin V⁺/PI⁺ cell ratio and cellular porimin expression, and lowered the levels of ROS and MDA while restoring GSH and SOD levels. DEX pretreatment also significantly increased the mitochondrial membrane potential and ATP level, upregulated the expressions of Nrf2, p-Nrf2, HO-1 and NQO1, and suppressed the expressions of TNF-α, IL-6 and IL-1β. The protective effects of DEX were obviously attenuated by interventions with ML385 or si-Nrf2. CONCLUSIONS DEX mitigates HS-induced HSKMC oncosis by activating the Nrf2/HO-1 pathway to relieve oxidative stress, mitochondrial dysfunction, and inflammatory responses.
Humans ; Dexmedetomidine/pharmacology* ; NF-E2-Related Factor 2/metabolism* ; Oxidative Stress/drug effects* ; Heat-Shock Response/drug effects* ; Signal Transduction/drug effects* ; Membrane Potential, Mitochondrial ; Muscle, Skeletal/cytology* ; Heme Oxygenase-1/metabolism* ; Apoptosis/drug effects*

Objective:To investigate the mediating role of psychological capital between the perception of decent work and work engagement among Operating Room nurses, and to provide insights for improving their work engagement.Methods:From December 2023 to February 2024, a total of 307 Operating Room nurses from four class ⅢGrade A hospitals in Beijing, Chongqing, Dalian, and Zhuhai were recruited using convenience sampling. Data were collected using a general information questionnaire, Work Engagement Scale, Decent Work Scale, and Nurses' Psychological Capital Scale. Pearson correlation analysis was conducted to examine the relationships among psychological capital, perception of decent work, and work engagement. Structural equation modeling and mediation analysis were performed using AMOS 24.0 software.Results:A total of 307 questionnaires were distributed, and 301 valid responses were collected, with an effective response rate of 98.05%. The mean scores for work engagement, perception of decent work, and psychological capital were (41.01±10.76), (67.30±17.86), and (93.30±15.15), respectively. Work engagement was positively correlated with both the perception of decent work and psychological capital (all P<0.01), and the perception of decent work was positively correlated with psychological capital ( P<0.01). Psychological capital partially mediated the relationship between the perception of decent work and work engagement, with the mediating effect accounting for 62.63%. Conclusions:Psychological capital plays a partial mediating role between the perception of decent work and work engagement among Operating Room nurses. Nursing managers can enhance nurses' work engagement by improving their perception of decent work and strengthening their psychological capital.

BACKGROUND:The induced membrane technique(Masquelet technique)is a novel two-stage surgical approach for the reconstruction of large bone defects,gaining increasing popularity in clinical applications.However,the precise mechanism underlying its bone defect repair is still not fully understood.OBJECTIVE:To review the background,repair mechanism and advantages of the induced membrane technique,the characteristics of the induced membrane,membrane-bone graft communication,selection of animal models,types and morphology of bone cement,the effects of loaded antibiotics on the induced membrane,choice of fixation methods,and bone tissue engineering materials to provide new insights for the future treatment of critical-sized bone defects and the improvement of the induced membrane technique.METHODS:A literature search was conducted in PubMed,Web of Science,and CNKI databases,covering publications from 1986 to 2024.A total of 890 references were retrieved.Manual screening and analysis were performed based on inclusion criteria related to the fundamental research of induced membrane technique,excluding those with poor relevance to the topic and duplicates.The included literature comprised original experimental studies,reviews,meta-analyses and other relevant publications.Finally,72 articles were included for summary and analysis.RESULTS AND CONCLUSION:(1)The mechanism underlying the bone defect repair using this technique remains unclear,but both the membrane and bone grafting are indispensable.(2)The induced membrane is a distinctively layered tissue rich in various bone-forming related cells,growth factors,and blood vessels,with its vascularization and secretion of growth factors dynamically changing overtime.(3)In terms of animal model selection,sheep are more similar to humans in anatomical structure,weight-bearing patterns,and bone remodeling.However,rats are more suitable considering their lower feeding costs,easier handling,and shorter modeling period.(4)Polymethyl methacrylate is not the only material that can be used to induce a biomembrane,and there may be more suitable materials capable of inducing higher-quality biomembranes.The recommended dose of antibiotics(primarily vancomycin)is 1-4 g per 40 g polymethyl methacrylate.(5)For animal fixation,especially in rats,the use of steel plates is more widespread,providing a more reliable and reproducible fixation method.(6)In the future,there is potential for new materials to replace autogenous bone and enhance the bone repair capabilities of the Masquelet technique.

BACKGROUND:The induced membrane technique(Masquelet technique)is a novel two-stage surgical approach for the reconstruction of large bone defects,gaining increasing popularity in clinical applications.However,the precise mechanism underlying its bone defect repair is still not fully understood.OBJECTIVE:To review the background,repair mechanism and advantages of the induced membrane technique,the characteristics of the induced membrane,membrane-bone graft communication,selection of animal models,types and morphology of bone cement,the effects of loaded antibiotics on the induced membrane,choice of fixation methods,and bone tissue engineering materials to provide new insights for the future treatment of critical-sized bone defects and the improvement of the induced membrane technique.METHODS:A literature search was conducted in PubMed,Web of Science,and CNKI databases,covering publications from 1986 to 2024.A total of 890 references were retrieved.Manual screening and analysis were performed based on inclusion criteria related to the fundamental research of induced membrane technique,excluding those with poor relevance to the topic and duplicates.The included literature comprised original experimental studies,reviews,meta-analyses and other relevant publications.Finally,72 articles were included for summary and analysis.RESULTS AND CONCLUSION:(1)The mechanism underlying the bone defect repair using this technique remains unclear,but both the membrane and bone grafting are indispensable.(2)The induced membrane is a distinctively layered tissue rich in various bone-forming related cells,growth factors,and blood vessels,with its vascularization and secretion of growth factors dynamically changing overtime.(3)In terms of animal model selection,sheep are more similar to humans in anatomical structure,weight-bearing patterns,and bone remodeling.However,rats are more suitable considering their lower feeding costs,easier handling,and shorter modeling period.(4)Polymethyl methacrylate is not the only material that can be used to induce a biomembrane,and there may be more suitable materials capable of inducing higher-quality biomembranes.The recommended dose of antibiotics(primarily vancomycin)is 1-4 g per 40 g polymethyl methacrylate.(5)For animal fixation,especially in rats,the use of steel plates is more widespread,providing a more reliable and reproducible fixation method.(6)In the future,there is potential for new materials to replace autogenous bone and enhance the bone repair capabilities of the Masquelet technique.

In recent years, non-invasive brain stimulation has been widely used in clinical rehabilitation due to its safe and non-invasive features.Particularly for stroke patients, this technique has become a new type of rehabilitation by virtue of its role in improving gait disorders, aphasia, dysphagia, and other complications. Previous research on stroke rehabilitation mainly focused on the cerebral cortex, while the recent evidences suggest that the cerebellum, with its rich synaptic plasticity and extensive structural and functional connectivity with the brain, has emerged as a promising target for non-invasive intervention in stroke rehabilitation. Non-invasive stimulation of the cerebellum is expected to improve patients' impaired function and quality of life. This review discusses the possible mechanisms and clinical applications of non-invasive cerebellar stimulation technology in regulating stroke rehabilitation, aiming to provide new treatment directions and application value for individualized stroke rehabilitation.

The cerebellum plays a critical role not only in motor control but also in reward processing, emotional regulation, and addictive behaviors.Addictive behaviors alter the cerebellum’s neurotransmitter systems and synaptic connections, leading to dysfunction and reinforcing the persistence of addiction.This review summarizes the anatomical and functional foundations of the cerebellum in the reward circuitry and explores how cerebellar synaptic plasticity influences brain function in both substance and behavioral addictions. Furthermore, the potential role of the cerebellum in the progress of addiction and its clinical application prospects in addiction treatment are also discussed.

Objective:To investigate the mediating role of psychological capital between the perception of decent work and work engagement among Operating Room nurses, and to provide insights for improving their work engagement.Methods:From December 2023 to February 2024, a total of 307 Operating Room nurses from four class ⅢGrade A hospitals in Beijing, Chongqing, Dalian, and Zhuhai were recruited using convenience sampling. Data were collected using a general information questionnaire, Work Engagement Scale, Decent Work Scale, and Nurses' Psychological Capital Scale. Pearson correlation analysis was conducted to examine the relationships among psychological capital, perception of decent work, and work engagement. Structural equation modeling and mediation analysis were performed using AMOS 24.0 software.Results:A total of 307 questionnaires were distributed, and 301 valid responses were collected, with an effective response rate of 98.05%. The mean scores for work engagement, perception of decent work, and psychological capital were (41.01±10.76), (67.30±17.86), and (93.30±15.15), respectively. Work engagement was positively correlated with both the perception of decent work and psychological capital (all P<0.01), and the perception of decent work was positively correlated with psychological capital ( P<0.01). Psychological capital partially mediated the relationship between the perception of decent work and work engagement, with the mediating effect accounting for 62.63%. Conclusions:Psychological capital plays a partial mediating role between the perception of decent work and work engagement among Operating Room nurses. Nursing managers can enhance nurses' work engagement by improving their perception of decent work and strengthening their psychological capital.

In recent years, non-invasive brain stimulation has been widely used in clinical rehabilitation due to its safe and non-invasive features.Particularly for stroke patients, this technique has become a new type of rehabilitation by virtue of its role in improving gait disorders, aphasia, dysphagia, and other complications. Previous research on stroke rehabilitation mainly focused on the cerebral cortex, while the recent evidences suggest that the cerebellum, with its rich synaptic plasticity and extensive structural and functional connectivity with the brain, has emerged as a promising target for non-invasive intervention in stroke rehabilitation. Non-invasive stimulation of the cerebellum is expected to improve patients' impaired function and quality of life. This review discusses the possible mechanisms and clinical applications of non-invasive cerebellar stimulation technology in regulating stroke rehabilitation, aiming to provide new treatment directions and application value for individualized stroke rehabilitation.

The cerebellum plays a critical role not only in motor control but also in reward processing, emotional regulation, and addictive behaviors.Addictive behaviors alter the cerebellum’s neurotransmitter systems and synaptic connections, leading to dysfunction and reinforcing the persistence of addiction.This review summarizes the anatomical and functional foundations of the cerebellum in the reward circuitry and explores how cerebellar synaptic plasticity influences brain function in both substance and behavioral addictions. Furthermore, the potential role of the cerebellum in the progress of addiction and its clinical application prospects in addiction treatment are also discussed.

Objective:To investigate the impact of receptor-interacting protein kinase 3 (RIPK3) on major adverse cardiovascular events (MACE) in patients with acute myocardial infarction (AMI) after percutaneous coronary intervention (PCI), as well as the predictive performance of RIPK3 combined with traditional cardiovascular risk factors.Methods:This study was a single-center prospective cohort study. It included patients with AMI who underwent PCI at Peking Union Medical College Hospital between September 2017 and November 2017. Baseline clinical data were collected, and plasma samples were obtained 6 hours after PCI to measure RIPK3 levels. Follow-up was conducted via outpatient visits or phone calls to record the occurrence of MACE, including cardiovascular death, hospitalization for heart failure, and vascular events (recurrent AMI or stroke). The predictive performance of RIPK3, traditional cardiovascular risk factors and their combination for MACE was compared using receiver operating characteristic (ROC) curves. Patients were divided into low- and high-RIPK3 level groups based on the optimal cutoff value of RIPK3. Multivariate Cox proportional hazards regression analysis was used to assess the impact of RIPK3 levels on MACE after PCI in AMI patients. Kaplan-Meier survival curves were plotted, and the log-rank test was used to compare MACE incidence between the low-and high-RIPK3 groups.Results:A total of 103 AMI patients who underwent PCI were included, aged 63.0 (56.0, 69.0) years, and 83 (80.6%) were male. The follow-up time was 5.17 (2.81, 5.17) years, during which 44 patients (42.7%) experienced MACE. The ROC curve analysis showed that the area under the curve ( AUC) for traditional cardiovascular risk factors was 0.68 (95% CI: 0.58-0.78), while the AUC for plasma RIPK3 was 0.72 (95% CI: 0.62-0.82). The combined AUC for traditional risk factors and RIPK3 was 0.75 (95% CI: 0.65-0.85). Multivariate Cox proportional hazards regression analysis indicated that plasma RIPK3 level is greater than or equal to the optimal cutoff value of 440.9 μg/L ( HR=3.31, 95% CI: 1.53-8.30, P=0.005) was an independent risk factor for MACE in AMI patients after PCI. Kaplan-Meier survival analysis demonstrated that the high-RIPK3 group had a significantly higher risk of MACE after PCI compared to the low-RIPK3 group (log-rank P=0.006). Conclusions:Elevated plasma RIPK3 level is an independent risk factor for MACE in AMI patients after PCI. Plasma RIPK3 combined with traditional cardiovascular risk factors can more effectively predict the occurrence of MACE in AMI patients after PCI. AMI patients with RIPK3≥440.9 μg/L have a higher risk of MACE after PCI.