ObjectiveThis study leverages structural data from antigen-antibody complexes of the influenza A virus neuraminidase (NA) protein to investigate the spatial recognition relationship between the antigenic epitopes and antibody paratopes. MethodsStructural data on NA protein antigen-antibody complexes were comprehensively collected from the SAbDab database, and processed to obtain the amino acid sequences and spatial distribution information on antigenic epitopes and corresponding antibody paratopes. Statistical analysis was conducted on the antibody sequences, frequency of use of genes, amino acid preferences, and the lengths of complementarity determining regions (CDR). Epitope hotspots for antibody binding were analyzed, and the spatial structural similarity of antibody paratopes was calculated and subjected to clustering, which allowed for a comprehensively exploration of the spatial recognition relationship between antigenic epitopes and antibodies. The specificity of antibodies targeting different antigenic epitope clusters was further validated through bio-layer interferometry (BLI) experiments. ResultsThe collected data revealed that the antigen-antibody complex structure data of influenza A virus NA protein in SAbDab database were mainly from H3N2, H7N9 and H1N1 subtypes. The hotspot regions of antigen epitopes were primarily located around the catalytic active site. The antibodies used for structural analysis were primarily derived from human and murine sources. Among murine antibodies, the most frequently used V-J gene combination was IGHV1-12*01/IGHJ2*01, while for human antibodies, the most common combination was IGHV1-69*01/IGHJ6*01. There were significant differences in the lengths and usage preferences of heavy chain CDR amino acids between antibodies that bind within the catalytic active site and those that bind to regions outside the catalytic active site. The results revealed that structurally similar antibodies could recognize the same epitopes, indicating a specific spatial recognition between antibody and antigen epitopes. Structural overlap in the binding regions was observed for antibodies with similar paratope structures, and the competitive binding of these antibodies to the epitope was confirmed through BLI experiments. ConclusionThe antigen epitopes of NA protein mainly ditributed around the catalytic active site and its surrounding loops. Spatial complementarity and electrostatic interactions play crucial roles in the recognition and binding of antibodies to antigenic epitopes in the catalytic region. There existed a spatial recognition relationship between antigens and antibodies that was independent of the uniqueness of antibody sequences, which means that antibodies with different sequences could potentially form similar local spatial structures and recognize the same epitopes.

Bombesin receptor subtype-3 (BRS3) is an orphan G protein-coupled receptor (GPCR) that plays critical roles in energy homeostasis, glucose metabolism, and insulin secretion. Recent structural studies have elucidated BRS3 signaling mechanisms using synthetic ligands, including BA1 and MK-5046. However, the molecular basis of BRS3 activation by bioactive natural compounds and their derivatives, particularly those derived from traditional Chinese medicine, remains unclear. Here, we present high-resolution cryogenic electron microscopy (cryo-EM) structures of the human BRS3-G_q complex in both unliganded and active states bound by two herb-derived compounds (DSO-5a and oridonin), at resolutions of 2.9, 2.8, and 2.9 Å, respectively. These structures display distinct ligand recognition patterns between DSO-5a and oridonin. Although both compounds bind to the orthosteric pocket, they differentially engage the interaction network of BRS3, as demonstrated by mutagenesis studies assessing calcium mobilization and inositol phosphate 1 (IP1) accumulation. These findings enhance our understanding of BRS3 activation and provide valuable insights into the development of small-molecule BRS3 modulators with therapeutic potential.

Digital technologies have become an integral part of complete denture restoration. With advancement in computer-aided design and computer-aided manufacturing (CAD/CAM), tools such as intraoral scanning, facial scanning, 3D printing, and numerical control machining are reshaping the workflow of complete denture restoration. Unlike conventional methods that rely heavily on clinical experience and manual techniques, digital technologies offer greater precision, predictability, and efficacy. They also streamline the process by reducing the number of patient visits and improving overall comfort. Despite these improvements, the clinical application of digital complete denture restoration still faces challenges that require further standardization. The major issues include appropriate case selection, establishing consistent digital workflows, and evaluating long-term outcomes. To address these challenges and provide clinical guidance for practitioners, this expert consensus outlines the principles, advantages, and limitations of digital complete denture technology. The aim of this review was to offer practical recommendations on indications, clinical procedures and precautions, evaluation metrics, and outcome assessment to support digital restoration of complete denture in clinical practice.
Humans ; Denture, Complete ; Computer-Aided Design ; Denture Design/methods* ; Consensus ; Printing, Three-Dimensional

Objective To study the effects of antibiotics and high-fat diet on energy metabolism and the browning of white adipose tissue (WAT) and brown adipose tissue (BAT) in mice, so as to provide new ideas for the possible mechanism of adipose tissue in the prevention and treatment of obesity. Methods A total of 80 10-week-old C57BL/6 male mice were fed with normal diet in the early stage, and the antibiotic gavage group (AG) and antibiotic high-fat group (AFG) were given mixed antibiotics by gavage. The blank group (BG) and the high-fat diet group (FG) were given normal saline intragastric solution for 2 weeks, and after the gavage operation, the FG group and the AFG group were given high-fat diet for obesity modeling, and the BG group and AG group continued to be fed with normal diet for 8 weeks (N=20). After the experiment, each group was injected with β3-adrenergic receptor agonists for 5 days, and the high-fat/ordinary diet remained unchanged. At the end of the experiment, basal metabolic rate (BMR), fasting blood glucose (FBG) and rectal temperature were measured, and feces, blood, subcutaneous white fat, epididymis and brown adipose tissue in the scapular area of mice were collected. The automatic biochemical analyzer was used to determine the blood biochemical indexes; reverse transcription polymerase chain reaction (RT-qPCR) was used to measure the expression of genes related to browning of WAT and BAT adipose tissue, respectively. Real-time quantitative polymerase chain reaction (qPCR) was used to determine the expression of WAT mitochondrial DNA (mt DNA). Results From the 4th week to the end of the experiment, the weight of the AFG group was significantly higher than that of the AG group and significantly lower than that of the FG group (P<0.05). The body weight, organ coefficient, serum TC level, rectal temperature and WAT cell diameter in the AFG group were significantly higher than those in the AG group. The serum levels of FBG, TC and LDL in the AFG group were significantly lower than those in the FG group (P<0.05). The overall BMR(mlO2/h) FG group was significantly higher than that of BG group, and the AFG group was significantly higher than that of AG. BMR per unit body weight (mlO2/h/g) AFG was significantly higher than that of FG group (P<0.05). The expressions of RIP140, PPAR-γ and UCP-1 in BAT in the AFG group were significantly higher than those in the FG group, and the mt DNA copy number of WAT in the AFG group was significantly higher than that in the FG group (P<0.05). Conclusion Antibiotic intervention can up-regulate the expression of brown fat-related genes in high-fat diet mice, increase brown fat activity, increase the relative mitochondrial number of white fat, increase the level of browning of white fat, promote thermogenesis, increase the BMR per unit body weight of adult obese mice, and then improve the overall energy metabolism of the body, and slow down the weight gain induced by high-fat diet to a certain extent.

Osteoporotic proximal humeral fracture (OPHF) is one of the common osteoporotic fractures in the aged, with an incidence only lower than vertebral compression fracture, hip fracture, and distal radius fracture. OPHF, secondary to osteoporosis and characterized by poor bone quality, comminuted fracture pattern, slow healing, and severely impaired shoulder joint function, poses a big challenge to the current clinical diagnosis and treatment. In the field of diagnosis, treatment, and rehabilitation of OPHF, traditional Chinese and Western medicine have accumulated rich experience and evidence from evidence-based medicine and achieved favorable outcomes. However, there is still a lack of guidance from a relevant consensus as to how to integrate the advantages of the two medical systems and achieve the integrated diagnosis and treatment. To promote the diagnosis and treatment of OPHF with integrated traditional Chinese and Western medicine, relevant experts from Orthopedic Expert Committee of Geriatric Branch of Chinese Association of Gerontology and Geriatrics, Youth Osteoporosis Group of Orthopedic Branch of Chinese Medical Association, Osteoporosis Group of Orthopedic Surgeon Branch of Chinese Medical Doctor Association, and Osteoporosis Committee of Shanghai Association of Integrated Traditional Chinese and Western Medicine have been organized to formulate Expert consensus on the diagnosis and treatment of osteoporotic proximal humeral fracture with integrated traditional Chinese and Western medicine ( version 2024) by searching related literatures and based on the evidences from evidence-based medicine. This consensus consists of 13 recommendations about the diagnosis, treatment and rehabilitation of OPHF with integrated traditional Chinese medicine and Western medicine, aimed at standardizing, systematizing, and personalizing the diagnosis and treatment of OPHF with integrated traditional Chinse and Western medicine to improve the patients ′ function.

Objective To explore the effect of mixed antibiotics on the intestinal flora of mice to affect the immune regulation of the body,explore the role of intestinal flora in the development of obesity,and provide new ideas and ways for the prevention and treatment of obesity.Methods Seventy-two 10-week-old male C57BL/6 mice were randomly divided into blank control(Ctrl)group,high-fat diet(HF)group,antibiotic(ABX)group,and combined(COMB)group(n=18).At the first 2 weeks(lavage intervention weeks),Ctrl and HF group were given normal saline gavage;ABX and COMB group were given mixed antibiotics gavage,and the gavage volume was 0.2 mL/animal/day.For the following 8 weeks(feeding weeks),Ctrl and ABX group were fed with ordinary diet,HF and COMB group were fed with high-fat diet.Body weight was measured weekly,and fasting blood glucose was measured before and after gavage,and at the 4th and 8th week of feeding.Oral glucose tolerance test was performed at the end of the experiment.The organ coefficient was measured and the cell morphology of white and brown adipose tissue was observed.Serum was collected for the determination of free fatty acid,high-density lipoprotein,low-density lipoprotein,triglyceride,and total cholesterol.Serum TNF-α,IL-10,IL-4,IL-13,IL-33 and MCP-1 was detected by ELISA.The stool of mice was collected for second generation sequencing.Results High-fat diet increased body weight,serum total cholesterol,low-density lipoprotein,IL-13,IL-33,TNF-α,MCP-1 content,and decreased glucose tolerance and organ coefficient in mice(P＜0.05).From the first feeding week to the end of the experiment,body weight in COMB group was significantly lower than that in HF group(P＜0.05).The level of glucose tolerance,serum total cholesterol,low density lipoprotein,IL-13,IL-33,TNF-α and MCP-1 in COMB group was lower than those in HF group(P＜0.05).The α diversity of intestinal flora in ABX group was lower than that in Ctrl group(P＜0.05).Congestion and bleeding in WAT were obvious in HF group,but not in COMB group.The microbial community composition of ABX and HF group was similar to that of Ctrl and COMB group,respectively.Conclusion High-fat diet induces obesity,disorder of glucose and lipid metabolism and inflammation in mice.Short-term mixed antibiotic use can regulate the intestinal flora of mice,mediate increased expression of related anti-inflammatory factors,up-regulate host immunity,and improve glucose and lipid metabolism in mice.

During the development of whole-cell microbial sensors,factors such as cellular metabolic activity and signal output modes play pivotal roles in the stability and repeatability of the sensors,presenting numerous challenges for the standardization of sensor applications. This research focused on the arsenic ion sensor based on the RepL amplifier,adjusting the reporter genes,culture media,growth stages,and induction times of arsenic ions,aiming to investigate how these factors affect the sensor's detection performance. The results indicated that the cell's culturing environment,growth status (e.g.,different growth phases),type of reporter,and induction time all had significant impacts on the performance of the arsenic ion sensor. First,the stability of the sensors varied greatly in different media,all the three sensors displayed greater stability in LB culture medium. Meanwhile,the cells in different growth stages also exhibited different performance advantages. Cells at the stationary growth phase exhibited better detection sensitivity and linearity,while cells in the logarithmic growth phase had lower limit of detection (LOD) . Moreover,there was an optimal induction time for the response of the sensor,overly long or short induction time could interfere with its response. The optimal induction time for the arsenic sensor in this work was about 2-3 h. By comparing three types of fluorescent protein reporters,it was found that although their detection limits were fairly similar,all within the range of 5-10μg/L,but their response times varied,ranging from 40 min to 2 h. The fluorescent proteins with higher brightness exhibited faster sensor response. These research outcomes provided a solid foundation for the practical application of microbes in detection. In practice,we could choose cells in specific states based on particular purpose,maximizing the performance of the cell sensors and further broadening the application scope of such sensors.

OBJECTIVE: To investigate the clinical efficacy of artificial cervical disc replacement for cervical disc herniation. METHODS: Retrospective analysis of 24 patients with cervical disc herniation with 24 segments admitted from July 2016 to July 2022, including 12 males and 12 females, with an average age of (50±2) years old ranging from 36 to 68 years old. The intervertebral space height of the lesion segment before replacement was 4.3 to 7.2 mm with an average of (5.6±1.6) mm, the range of motion of anterior flexion and posterior extension was 5.6° to 7.2° with an average of (6.4±1.3)°, the range of motion for the left and right lateral flexion was 10.2° to 11.4° with an average of (10.7±1.8)°, and the Japanese Orthopaedic Association (JOA) score was 8 to 13 scores with an average of (8.0±0.3) scores. Through anterior incision, artificial cervical disc replacement surgery was performed after cervical discectomy and decompression. RESULTS: After surgery, all patients'incisions healed well. All patients were followed up from 12 to 60 months with an average of (33±12) months. At the final follow-up, the intervertebral space height of replacement segment was 4.0 to 6.8 mm with an average of (5.4±1.3) mm, the range of motion of anterior flexion and posterior extension was 4.6° to 6.4°with an average of (5.6±1.2)°, the range of motion of left and right lateral flexion was 8.7°to 10.3°with an average of (9.5±1.5)°. The prosthesis did not shift or sink, slight heterotopic ossification occurred within the operative segment(ⅠorⅡgrade). The height of adjacent intervertebral spaces was not lost, there was no vertebral degeneration, no significant change in the comparison of adjacent segment mobility before and after surgery. The JOA score increased from (8.0±0.3) scores before replacement operation to (15.0±0.2) scores after operation. CONCLUSION Artificial cervical disc replacement surgery can not only obtain the same efficacy as the anterior cervical disc fusion surgery, but also avoid the increase of compensatory stress of adjacent segments, maintain the stability of the biomechanical environment, thereby reducing the incidence of degeneration of adjacent segments, and can be used as an effective method for the treatment of cervical disc herniation, , but the long-term efficacy and the existing problems of replacement surgery need to be further studied and solved in the future.
Humans ; Male ; Female ; Middle Aged ; Intervertebral Disc Displacement/surgery* ; Adult ; Cervical Vertebrae/surgery* ; Total Disc Replacement/methods* ; Aged ; Retrospective Studies

The major vascular complications associated with diabetes make the management of diabetic mellitus erectile dysfunction (DMED) a challenging endeavor. Notable factors contributing to DMED include oxidative stress, nitric oxide (NO)/cyclic guanosine monophosphate (cGMP) pathway activation, and apoptosis, while nitro-oleic acid (NO2-OA) has been shown to be beneficial in treating these aspects of this condition. We, herein, investigated the effects and possible mechanisms of NO2-OA on erectile function as assessed in a streptozotocin-induced rat model of diabetes. Our results revealed that the erectile function of DMED rats was significantly impaired compared with that of the control group. However, in response to 4 weeks of NO2-OA treatment, there was an improvement in erectile function. The expression of oxidative stress-related indicators was significantly increased and the NO/cGMP pathway was impaired in the DMED group. The expression of proapoptotic factors was increased, while that of antiapoptotic factors was decreased in the DMED group. Moreover, the cell morphology in the cavernous tissue of the DMED group also changed adversely. NO2-OA treatment significantly reversed all these changes observed in the DMED group. In conclusion, NO2-OA treatment partially improved erectile function in DMED rats through mechanisms that included inhibition of oxidative stress, activation of the NO/cGMP pathway, and a reduction in apoptosis.

ObjectiveTo explore the neuromuscular control mechanism of training strategies based on mirror neuron system (MNS): action observation (AO), action execution (AE) and action imitation (AO+AE) using functional Near Infrared Spectroscopy (fNIRS) and surface electromyography (sEMG). MethodsFrom July, 2022 to February, 2023, 64 healthy adults were asked to finish four tasks: watching landscape video (control), watching landscape video and acting right wrist and hand extension (AE), watching right wrist and hand extension video (AO), and watching right wrist and hand extension video and acting right wrist and hand extension (AO+AE). A block design was adopted, five times a task in a block, eight cycles, random orders in videos and tasks. The activation of each channel and regions of interest (ROI, namely BA40, BA44, BA45, BA46, BA6 and BA7) in left MNS regions was detected with fNIRS synchronously, as well as the average electromyography (AEMG) of extensor digitorum and extensor carpi radialis with sEMG. ResultsCompared with the control condition, MNS activated in AO, AE and AO+AE conditions, and the intensities mildly increased in turn. Compared with the control condition, 15 channels activated in AO condition, 15 channels activated in AE condition, and all 20 channels activated in AO+AE condition; and the activation intensities of most channels were AO+AE > AE > AO. Four ROI, BA40, BA46, BA6 and BA7, activated in AO condition, all the six ROI activated in AE and AO+AE conditions, and the activation intensities of most ROI were AO+AE > AE > AO. The standardized AEMG of extensor digitorum and extensor carpi radialis were higher in AO+AE condition than in AE condition (|t| > 4.24, P < 0.001). ConclusionMNS has been activated during action observation, execution and imitation, and the ranges and intensities of activation increase in turn. The target muscles activate more during imitation than during execution. Synchronous application of fNIRS and sEMG is feasible in the study of neural mechanism of rehabilitation strategies based on mirror neuron theory.