Objective:To detect the expression levels of various immune cells in peripheral blood,and to ex-plore their relationship with unexplained recurrent spontaneous abortion(URSA)and its clinical significance in di-agnosis and treatment.Methods:A total of 351 patients with URSA who visited Hebei Reproductive Health Hospi-tal between January 2020 and September 2022 were enrolled as the URSA group,while a control group compri-sing 30 healthy women who had experienced uncomplicated term delivery once and had no history of adverse pregnancy outcomes during the same period was selected.The levels of various immune cell subsets in peripheral blood during the luteal phase were measured and compared between the two groups.Receiver operating charac-teristic(ROC)curve analysis was performed to determine the optimal cutoff values of immune cell levels that could assist in URSA diagnosis and treatment,while logistic regression analysis was conducted to identify factors influ-encing URSA occurrence.Results:The number and percentage of CD3+CD8+cells in the peripheral blood of the URSA group were significantly lower compared to those in the control group(P＜0.05).Conversely,the per-centage of NK cells was significantly higher in the URSA group than in the control group(P＜0.05).Logistic re-gression analysis revealed that the increase in CD3+CD8+cell count in peripheral blood during the luteal phase was a protective factor of URSA(OR＜1,P＜0.05).ROC curve analysis determined optimal cutoff values for im-mune cell levels to assist in the diagnosing and treating URSA:702.82 cells/μl for CD3+CD8+cell count,28.39％for CD3+CD8+cell percentage,and 12.33％for NK cell percentage.After using the optimal cutoff value to convert continuous variables into binary variables,Logistic regression analysis showed that a CD3+CD8+cell count＜702.82 cells/μl and an NK cell percentage＞12.33％were independent risk factors for URSA(OR＞1,P＜0.05).Conclusions:The decrease of CD3+CD8+cells in peripheral blood during midluteal phase is closely related to the occurrence of URSA.The number of CD3+CD8+cells(702.82 cells/μl)and the percentage of NK cells(12.33％)can be used as reference values for the diagnosis and treatment of URSA.

Objective:To detect the expression levels of various immune cells in peripheral blood,and to ex-plore their relationship with unexplained recurrent spontaneous abortion(URSA)and its clinical significance in di-agnosis and treatment.Methods:A total of 351 patients with URSA who visited Hebei Reproductive Health Hospi-tal between January 2020 and September 2022 were enrolled as the URSA group,while a control group compri-sing 30 healthy women who had experienced uncomplicated term delivery once and had no history of adverse pregnancy outcomes during the same period was selected.The levels of various immune cell subsets in peripheral blood during the luteal phase were measured and compared between the two groups.Receiver operating charac-teristic(ROC)curve analysis was performed to determine the optimal cutoff values of immune cell levels that could assist in URSA diagnosis and treatment,while logistic regression analysis was conducted to identify factors influ-encing URSA occurrence.Results:The number and percentage of CD3+CD8+cells in the peripheral blood of the URSA group were significantly lower compared to those in the control group(P＜0.05).Conversely,the per-centage of NK cells was significantly higher in the URSA group than in the control group(P＜0.05).Logistic re-gression analysis revealed that the increase in CD3+CD8+cell count in peripheral blood during the luteal phase was a protective factor of URSA(OR＜1,P＜0.05).ROC curve analysis determined optimal cutoff values for im-mune cell levels to assist in the diagnosing and treating URSA:702.82 cells/μl for CD3+CD8+cell count,28.39％for CD3+CD8+cell percentage,and 12.33％for NK cell percentage.After using the optimal cutoff value to convert continuous variables into binary variables,Logistic regression analysis showed that a CD3+CD8+cell count＜702.82 cells/μl and an NK cell percentage＞12.33％were independent risk factors for URSA(OR＞1,P＜0.05).Conclusions:The decrease of CD3+CD8+cells in peripheral blood during midluteal phase is closely related to the occurrence of URSA.The number of CD3+CD8+cells(702.82 cells/μl)and the percentage of NK cells(12.33％)can be used as reference values for the diagnosis and treatment of URSA.

Objective:To understand the molecular characteristics of the mutant strain of polymerase basic protein 2 (PB2) gene of influenza A (H1N1pdm) in Guangdong province, and to explore its specific molecular sites, so as to provide scientific basis for the prevention and control of influenza virus.Methods:Throat swab samples were collected from 2 cases infected with PB2 gene variant strains for virus isolation, and 23 influenza virus strains were selected from Guangdong province for sequencing analysis. The reference sequences and vaccine strain sequences provided by GISAID were used to perform evolutionary analysis on hemagglutinin (HA) and PB2 genes. Virus strain antigen analysis and neuraminidase (NA) inhibition test were carried out. PB2 protein model was constructed and polymerase activity was analyzed.Results:H399N amino acid mutation occurred in the HA gene of PB2-D701N and PB2-A271S variant strains, both of which belonged to the branch of 6B.1A.5a.2a. They belonged to the same big branch and different small branches as the vaccine strain A/Victoria/4897/2022, and they are all vaccine-like strains. In the three-dimensional structure, the mutations of PB2-D701N and PB2-A271S change charge and hydrophobicity.Conclusions:PB2-D701 and A271 were highly conserved, and PB2 mutant strains were not the dominant strains. The PB2 mutant had high antigenicity with the vaccine. The PB2 mutant strain is sensitive to NA inhibitors. The three-dimensional model predicted that PB2-D701N mutation could enhance virulence and affect transmissibility of influenza virus, while PB2-A271S mutation could affect polymerase activity and polymerase complex synthesis of influenza virus.

Objective:To detect the expression levels of various immune cells in peripheral blood,and to ex-plore their relationship with unexplained recurrent spontaneous abortion(URSA)and its clinical significance in di-agnosis and treatment.Methods:A total of 351 patients with URSA who visited Hebei Reproductive Health Hospi-tal between January 2020 and September 2022 were enrolled as the URSA group,while a control group compri-sing 30 healthy women who had experienced uncomplicated term delivery once and had no history of adverse pregnancy outcomes during the same period was selected.The levels of various immune cell subsets in peripheral blood during the luteal phase were measured and compared between the two groups.Receiver operating charac-teristic(ROC)curve analysis was performed to determine the optimal cutoff values of immune cell levels that could assist in URSA diagnosis and treatment,while logistic regression analysis was conducted to identify factors influ-encing URSA occurrence.Results:The number and percentage of CD3+CD8+cells in the peripheral blood of the URSA group were significantly lower compared to those in the control group(P＜0.05).Conversely,the per-centage of NK cells was significantly higher in the URSA group than in the control group(P＜0.05).Logistic re-gression analysis revealed that the increase in CD3+CD8+cell count in peripheral blood during the luteal phase was a protective factor of URSA(OR＜1,P＜0.05).ROC curve analysis determined optimal cutoff values for im-mune cell levels to assist in the diagnosing and treating URSA:702.82 cells/μl for CD3+CD8+cell count,28.39％for CD3+CD8+cell percentage,and 12.33％for NK cell percentage.After using the optimal cutoff value to convert continuous variables into binary variables,Logistic regression analysis showed that a CD3+CD8+cell count＜702.82 cells/μl and an NK cell percentage＞12.33％were independent risk factors for URSA(OR＞1,P＜0.05).Conclusions:The decrease of CD3+CD8+cells in peripheral blood during midluteal phase is closely related to the occurrence of URSA.The number of CD3+CD8+cells(702.82 cells/μl)and the percentage of NK cells(12.33％)can be used as reference values for the diagnosis and treatment of URSA.

Objective:To detect the expression levels of various immune cells in peripheral blood,and to ex-plore their relationship with unexplained recurrent spontaneous abortion(URSA)and its clinical significance in di-agnosis and treatment.Methods:A total of 351 patients with URSA who visited Hebei Reproductive Health Hospi-tal between January 2020 and September 2022 were enrolled as the URSA group,while a control group compri-sing 30 healthy women who had experienced uncomplicated term delivery once and had no history of adverse pregnancy outcomes during the same period was selected.The levels of various immune cell subsets in peripheral blood during the luteal phase were measured and compared between the two groups.Receiver operating charac-teristic(ROC)curve analysis was performed to determine the optimal cutoff values of immune cell levels that could assist in URSA diagnosis and treatment,while logistic regression analysis was conducted to identify factors influ-encing URSA occurrence.Results:The number and percentage of CD3+CD8+cells in the peripheral blood of the URSA group were significantly lower compared to those in the control group(P＜0.05).Conversely,the per-centage of NK cells was significantly higher in the URSA group than in the control group(P＜0.05).Logistic re-gression analysis revealed that the increase in CD3+CD8+cell count in peripheral blood during the luteal phase was a protective factor of URSA(OR＜1,P＜0.05).ROC curve analysis determined optimal cutoff values for im-mune cell levels to assist in the diagnosing and treating URSA:702.82 cells/μl for CD3+CD8+cell count,28.39％for CD3+CD8+cell percentage,and 12.33％for NK cell percentage.After using the optimal cutoff value to convert continuous variables into binary variables,Logistic regression analysis showed that a CD3+CD8+cell count＜702.82 cells/μl and an NK cell percentage＞12.33％were independent risk factors for URSA(OR＞1,P＜0.05).Conclusions:The decrease of CD3+CD8+cells in peripheral blood during midluteal phase is closely related to the occurrence of URSA.The number of CD3+CD8+cells(702.82 cells/μl)and the percentage of NK cells(12.33％)can be used as reference values for the diagnosis and treatment of URSA.

Spastic paraplegia type 4 (SPG4) is the most common type of autosomally inherited spastic paraplegia. Its main clinical features include typical simple hereditary spastic paraplegia, with neurological impairments limited to lower limb spasticity, hypertonic bladder dysfunction, and mild weakening of lower limb vibration sensation, without accompanying features such as nerve atrophy, ataxia, cognitive impairment, seizures, and muscle tone disorders. SPAST is the main pathogenic gene underlying SPG4, and various pathogenic SPAST variants have been discovered. This disease has featured a high degree of clinical heterogeneity, and the same pathogenic variant can have different age of onset and severity among patients and even within the same family. There is a lack of systematic research on the correlation between the genotype and phenotype of SPG4, and the pathogenic mechanism has remained controversial. This article has provided a review for the clinical characteristics, pathogenic gene characteristics, correlation between the genotype and phenotype, and pathogenic mechanism of this disease, with an aim to provide reference for its clinical diagnosis and treatment.

OBJECTIVE To investigate the metabolic changes in MEG-01 megakaryocytes after treatment with linezolid （LZD） from metabolomic perspective and its impact on the the proliferation of cells and generation of platelet precursors. METHODS MEG-01 cells were seeded in proliferation medium and divided into blank control group （untreated）， solvent control group （4‰DMSO）， and 100， 200， 400， 800 μg/mL LZD groups. The proliferation status of cells in each group was observed under the microscope； cell proliferation and viability were assessed. Cells were also seeded in differentiation medium and divided into blank control group （untreated）， solvent control group （4‰DMSO）， and 400 μg/mL LZD group； after 14 days of culture， platelet precursor generation was observed under the microscope； immunofluorescence staining was performed to count the proportion of cells producing pseudopodia， the relative length of pseudopodia was measured， and the expression levels of CD41 and CD42b mRNA were assessed. Cells from the solvent control group and the 400 μg/mL LZD group， cultured in differentiation medium for 14 days， were extracted and subjected to non-targeted metabolomics and targeted energy metabolomics analysis using liquid chromatography-tandem mass spectrometry. The relative content of pyruvate in cells， after being cultured for 14 days with the addition of pyruvate （10 mmol/L） or LZD （400 μg/mL）+pyruvate （10 mmol/L）， was measured and observed， as well as its effects on cell proliferation and platelet precursor generation. RESULTS 400 μg/mL LZD could significantly inhibit the proliferation of MEG-01 cells and the generation of platelet precursors （P＜0.01）. Non-targeted metabolomic analysis of MEG-01 cells after 400 μg/mL LZD treatment revealed significant changes in energy metabolism-related pathways such as mTOR signaling pathway， alanine， aspartate and glutamate metabolism， and central carbon metabolism in cancer. Targeted energy metabolomic analysis further showed that the relative contents of adenosine triphosphate， guanosine triphosphate， and pyruvate in MEG-01 cells were significantly reduced （P＜0.01）， while the relative contents of lactate were significantly increased （P＜0.01）. Compared with the LZD group， the relative content of pyruvate， cell count， the proportion of cells producing pseudopodia and the relative length of pseudopodia were significantly increased in the LZD+pyruvate group （P＜0.01）. CONCLUSIONS LZD may reduce pyruvate production by inhibiting mitochondrial energy metabolism， thereby suppressing megakaryocyte proliferation and platelet precursor production， ultimately leading to the occurrence of thrombocytopenia.

Objective: To retrospectively analyze the epidemiological characteristics of supernumerary teeth in patients aged 4-18 years old and the influencing factors on the selection of anesthesia methods, and to provide a reference for the selection of anesthesia plans for children and adolescents with supernumerary teeth. Methods: This study is a retrospective study approved by the Institutional Ethics Committee. Based on clinical electronic medical record system and cone beam CT (CBCT) data, a retrospective analysis was conducted on 2 210 patients 4-18 years of age who underwent supernumerary tooth extraction at the School of Stomatology, Fourth Military Medical University from August 2019 to July 2021. Inclusion criteria: ① Age 4-18 years old; and ② The American Society of Anesthesiologists (ASA) classifies anesthesia into grades I-II; and ③ Have complete oral and anesthesia case records and relevant imaging data. Exclusion criteria: ① Incomplete medical records or unclear imaging data; and ② Patients with ASA grade II or above. Patients’ gender and age, the number of supernumerary teeth, arch, location, orientation, eruption status, reason for appointment, anxiety level, degree of cooperation, anesthesia method, and other relevant information were collected and statistically analyzed. Results: A total of 1 865 eligible patients were included, with an average age of (8.9±3.2) years old. There were more male patients (71.37%, 1 331 cases) than female patients (28.63%, 534 cases) (P < 0.001), with a gender ratio of 2.49:1. The majority of supernumerary teeth were single (75.97%, 1 417/1 865), primarily located in the maxilla (97.2%, 1 812/1 865) and the anterior dental region (94.2%, 1 757/1 865), and in a centric position (77.3%, 1 442/1 865). The majority of patients with erupted supernumerary teeth were active in seeking treatment (97.67%, 335/343). Patients with supernumerary teeth located in the maxilla and mandible bones, as well as in the nasal floor, were mainly referred to the department for diagnosis, accounting for 94.38%(1 361/1 442) and 90.00% (72/80) (χ2=1 363.24, P < 0.001), respectively. Regarding anesthesia methods, the largest proportion of patients received nitrous oxide sedation-assisted local anesthesia or nerve block anesthesia, accounting for 38.07% (710/1 865), followed by local anesthesia, accounting for 35.23% (657/1 865). The proportion of patients receiving midazolam intravenous sedation with local anesthesia or nerve block anesthesia and general anesthesia was relatively small, accounting for 20.86% (389/1 865) and 5.84% (109/1 865). Patients 13-18 years of age with supernumerary teeth in the mandibular and posterior regions and without anxiety had the highest proportion of local anesthesia use (P < 0.001). In contrast, patients who had supernumerary teeth located at the base of the nose (50%), severe anxiety (94.12%), and poor cooperation (98.18%) had the highest proportion of general anesthesia use (P < 0.001). There was no significant difference (P = 0.35) in the incidence of intraoperative and postoperative complications after the extraction of supernumerary teeth. However, the proportion of anesthesia-related complications, such as dizziness, coughing, and respiratory depression, occurring in patients who received general anesthesia was higher than local anesthesia, accounting for 3.81% (P = 0.006). Conclusion There is a gender difference in the incidence of supernumerary teeth in patients 4-18 years of age, with a higher prevalence in males. The majority of supernumerary teeth are single and located in the maxillary anterior region, predominantly in a centric position. Patients whose teeth had erupted were more likely to seek medical treatment voluntarily, while patients with supernumerary teeth located in the maxilla and mandible bones, as well as in the nasal floor were more likely to be referred to the department. Patients with high levels of anxiety, poor cooperation, young age, multiple teeth, and high surgical difficulty were more inclined to choose general anesthesia.

Objective:To detect the expression levels of various immune cells in peripheral blood,and to ex-plore their relationship with unexplained recurrent spontaneous abortion(URSA)and its clinical significance in di-agnosis and treatment.Methods:A total of 351 patients with URSA who visited Hebei Reproductive Health Hospi-tal between January 2020 and September 2022 were enrolled as the URSA group,while a control group compri-sing 30 healthy women who had experienced uncomplicated term delivery once and had no history of adverse pregnancy outcomes during the same period was selected.The levels of various immune cell subsets in peripheral blood during the luteal phase were measured and compared between the two groups.Receiver operating charac-teristic(ROC)curve analysis was performed to determine the optimal cutoff values of immune cell levels that could assist in URSA diagnosis and treatment,while logistic regression analysis was conducted to identify factors influ-encing URSA occurrence.Results:The number and percentage of CD3+CD8+cells in the peripheral blood of the URSA group were significantly lower compared to those in the control group(P＜0.05).Conversely,the per-centage of NK cells was significantly higher in the URSA group than in the control group(P＜0.05).Logistic re-gression analysis revealed that the increase in CD3+CD8+cell count in peripheral blood during the luteal phase was a protective factor of URSA(OR＜1,P＜0.05).ROC curve analysis determined optimal cutoff values for im-mune cell levels to assist in the diagnosing and treating URSA:702.82 cells/μl for CD3+CD8+cell count,28.39％for CD3+CD8+cell percentage,and 12.33％for NK cell percentage.After using the optimal cutoff value to convert continuous variables into binary variables,Logistic regression analysis showed that a CD3+CD8+cell count＜702.82 cells/μl and an NK cell percentage＞12.33％were independent risk factors for URSA(OR＞1,P＜0.05).Conclusions:The decrease of CD3+CD8+cells in peripheral blood during midluteal phase is closely related to the occurrence of URSA.The number of CD3+CD8+cells(702.82 cells/μl)and the percentage of NK cells(12.33％)can be used as reference values for the diagnosis and treatment of URSA.

Objective:To detect the expression levels of various immune cells in peripheral blood,and to ex-plore their relationship with unexplained recurrent spontaneous abortion(URSA)and its clinical significance in di-agnosis and treatment.Methods:A total of 351 patients with URSA who visited Hebei Reproductive Health Hospi-tal between January 2020 and September 2022 were enrolled as the URSA group,while a control group compri-sing 30 healthy women who had experienced uncomplicated term delivery once and had no history of adverse pregnancy outcomes during the same period was selected.The levels of various immune cell subsets in peripheral blood during the luteal phase were measured and compared between the two groups.Receiver operating charac-teristic(ROC)curve analysis was performed to determine the optimal cutoff values of immune cell levels that could assist in URSA diagnosis and treatment,while logistic regression analysis was conducted to identify factors influ-encing URSA occurrence.Results:The number and percentage of CD3+CD8+cells in the peripheral blood of the URSA group were significantly lower compared to those in the control group(P＜0.05).Conversely,the per-centage of NK cells was significantly higher in the URSA group than in the control group(P＜0.05).Logistic re-gression analysis revealed that the increase in CD3+CD8+cell count in peripheral blood during the luteal phase was a protective factor of URSA(OR＜1,P＜0.05).ROC curve analysis determined optimal cutoff values for im-mune cell levels to assist in the diagnosing and treating URSA:702.82 cells/μl for CD3+CD8+cell count,28.39％for CD3+CD8+cell percentage,and 12.33％for NK cell percentage.After using the optimal cutoff value to convert continuous variables into binary variables,Logistic regression analysis showed that a CD3+CD8+cell count＜702.82 cells/μl and an NK cell percentage＞12.33％were independent risk factors for URSA(OR＞1,P＜0.05).Conclusions:The decrease of CD3+CD8+cells in peripheral blood during midluteal phase is closely related to the occurrence of URSA.The number of CD3+CD8+cells(702.82 cells/μl)and the percentage of NK cells(12.33％)can be used as reference values for the diagnosis and treatment of URSA.