1.Herbal Textual Research on Inulae Flos in Famous Classical Formulas
Caixia LIU ; Yue HAN ; Yanzhu MA ; Lei GAO ; Sheng WANG ; Yan YANG ; Wenchuan LUO ; Ling JIN ; Jing SHAO ; Zhijia CUI ; Zhilai ZHAN
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):210-221
In this paper, by referring to ancient and modern literature, the textual research of Inulae Flos has been conducted to clarify the name, origin, production area, quality evaluation, harvesting, processing and others, so as to provide reference and basis for the development and utilization of famous classical formulas containing this herb. After textual research, it could be verified that the medicinal use of Inulae Flos was first recorded in Shennong Bencaojing of the Han dynasty. In successive dynasties, Xuanfuhua has been taken as the official name, and it also has other alternative names such as Jinfeicao, Daogeng and Jinqianhua. The period before the Song and Yuan dynasties, the main origin of Inulae Flos was the Asteraceae plant Inula japonica, and from the Ming and Qing dynasties to the present, I. japonica and I. britannica are the primary source. In addition to the dominant basal species, there are also regional species such as I. linariifolia, I. helianthus-aquatili, and I. hupehensis. The earliest recorded production areas in ancient times were Henan, Hubei and other places, and the literature records that it has been distributed throughout the country since modern times. The medicinal part is its flower, the harvesting and processing method recorded in the past dynasties is mainly harvested in the fifth and ninth lunar months, and dried in the sun, and the modern harvesting is mostly harvested in summer and autumn when the flowers bloom, in order to remove impurities, dry in the shade or dry in the sun. In addition, the roots, whole herbs and aerial parts are used as medicinal materials. In ancient times, there were no records about the quality of Inulae Flos, and in modern times, it is generally believed that the quality of complete flower structure, small receptacles, large blooms, yellow petals, long filaments, many fluffs, no fragments, and no branches is better. Ancient processing methods primarily involved cleaning, steaming, and sun-drying, supplemented by techniques such as boiling, roasting, burning, simmering, stir-frying, and honey-processing. Modern processing focuses mainly on cleaning the stems and leaves before use. Regarding the medicinal properties, ancient texts describe it as salty and sweet in taste, slightly warm in nature, and mildly toxic. Modern studies characterize it as bitter, pungent, and salty in taste, with a slightly warm nature. Its therapeutic effects remain consistent across eras, including descending Qi, resolving phlegm, promoting diuresis, and stopping vomiting. Based on the research results, it is recommended that when developing famous classical formulas containing Inulae Flos, either I. japonica or I. britannica should be used as the medicinal source. Processing methods should follow formula requirements, where no processing instructions are specified, the raw products may be used after cleaning.
2.Herbal Textual Research on Inulae Flos in Famous Classical Formulas
Caixia LIU ; Yue HAN ; Yanzhu MA ; Lei GAO ; Sheng WANG ; Yan YANG ; Wenchuan LUO ; Ling JIN ; Jing SHAO ; Zhijia CUI ; Zhilai ZHAN
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(3):210-221
In this paper, by referring to ancient and modern literature, the textual research of Inulae Flos has been conducted to clarify the name, origin, production area, quality evaluation, harvesting, processing and others, so as to provide reference and basis for the development and utilization of famous classical formulas containing this herb. After textual research, it could be verified that the medicinal use of Inulae Flos was first recorded in Shennong Bencaojing of the Han dynasty. In successive dynasties, Xuanfuhua has been taken as the official name, and it also has other alternative names such as Jinfeicao, Daogeng and Jinqianhua. The period before the Song and Yuan dynasties, the main origin of Inulae Flos was the Asteraceae plant Inula japonica, and from the Ming and Qing dynasties to the present, I. japonica and I. britannica are the primary source. In addition to the dominant basal species, there are also regional species such as I. linariifolia, I. helianthus-aquatili, and I. hupehensis. The earliest recorded production areas in ancient times were Henan, Hubei and other places, and the literature records that it has been distributed throughout the country since modern times. The medicinal part is its flower, the harvesting and processing method recorded in the past dynasties is mainly harvested in the fifth and ninth lunar months, and dried in the sun, and the modern harvesting is mostly harvested in summer and autumn when the flowers bloom, in order to remove impurities, dry in the shade or dry in the sun. In addition, the roots, whole herbs and aerial parts are used as medicinal materials. In ancient times, there were no records about the quality of Inulae Flos, and in modern times, it is generally believed that the quality of complete flower structure, small receptacles, large blooms, yellow petals, long filaments, many fluffs, no fragments, and no branches is better. Ancient processing methods primarily involved cleaning, steaming, and sun-drying, supplemented by techniques such as boiling, roasting, burning, simmering, stir-frying, and honey-processing. Modern processing focuses mainly on cleaning the stems and leaves before use. Regarding the medicinal properties, ancient texts describe it as salty and sweet in taste, slightly warm in nature, and mildly toxic. Modern studies characterize it as bitter, pungent, and salty in taste, with a slightly warm nature. Its therapeutic effects remain consistent across eras, including descending Qi, resolving phlegm, promoting diuresis, and stopping vomiting. Based on the research results, it is recommended that when developing famous classical formulas containing Inulae Flos, either I. japonica or I. britannica should be used as the medicinal source. Processing methods should follow formula requirements, where no processing instructions are specified, the raw products may be used after cleaning.
3.Species of sandflies and prevalence of Leishmania infections in sandflies in selected areas of northern and northwestern China
Yaqi HE ; Lei CUI ; Yi ZHANG ; Yuanyuan LI ; Limin YANG ; Yuan FANG ; Zhongqiu LI ; Zhengbin ZHOU
Chinese Journal of Schistosomiasis Control 2026;38(1):20-28
Objective To investigate the species of sandflies and the prevalence of Leishmania infections in sandflies from selected areas of northern and northwestern China, so as to provide insights into identification of leishmaniasis vectors and assessment of epidemiological trends of leishmaniasis in China. Methods Sandfly samples were collected from Mentougou District of Beijing Municipality, Xiangning County in Linfen City of Shanxi Province, Ejin Banner in Alxa League of Inner Mongolia Autonomous Region, and Payzawat County of Karamay District of Karamay City, Gaochang District of Turpan City in Xinjiang Uygur Autonomous Region from July 2023 to July 2024. Approximately 100 intact female sandfly samples were randomly selected from each site and the species of sandflies was identified according to morphological characteristics and molecular assays. Female sandflies originating from the same habitat were grouped into pools of 10 individuals. Leishmania infection was detected using polymerase chain reaction (PCR) assay targeting the internal transcribed spacer 1 (ITS-1) gene, and the prevalence of Leishmania infection was calculated in sandflies from different sampling sites using the minimum infection rate (MIR) method. In addition, positive amplicons were sequenced and subjected to phylogenetic analysis. Results A total of 6 155 sandflies were collected from different environments at sampling sites across the six aforementioned regions from July 2023 to July 2024. Phlebotomus chinensis (96.00%) was the dominant sandfly species in Mentougou District, Beijing Municipality, with a small proportion of Ph. sergenti (4.00%), and only Ph. chinensis was found in Xiangning County, Linfen City, Shanxi Province. Ph. wui was the only sandfly species detected in Ejin Banner, Alxa League, Inner Mongolia Autonomous Region, and Payzawat County, Kashgar City, Xinjiang Uygur Autonomous Region, and Ph. caucasicus (97.70%) was the dominant sandfly species in Karamay District, Karamay City, Xinjiang Uygur Autonomous Region, with a small proportion of Ph. wui (2.30%), while Ph. alexandri was the only species in Gaochang District, Turpan City, Xinjiang Uygur Autonomous Region. A total of 40, 60, 34, 18, 18, and 22 pools of sandfly samples were tested from Mentougou District in Beijing Municipality, Xiangning County in Linfen City of Shanxi Province, Ejin Banner in Alxa League of Inner Mongolia Autonomous Region, Payzawat County in Kashgar City, Karamay District in Karamay City, and Gaochang District in Turpan City of Xinjiang Uygur Autonomous Region, respectively. L. infantum was detected in Ph. chinensis samples from Mentougou District in Beijing Municipality, and Xiangning County of Linfen City in Shanxi Province, with MIR of 0.25% to 1.00%, and L. donovani was detected in Ph. wui from Ejin Banner in Alxa League of Inner Mongolia Autonomous Region, and Payzawat County in Kashgar City of Xinjiang Uygur Autonomous Region, with MIR of 0.56% to 0.88%; however, no Leishmania infection was detected in Ph. caucasicus from Karamay District in Karamay City or Ph. alexandri from Gaochang District in Turpan City of Xinjiang Uygur Autonomous Region. Phylogenetic analysis showed that the Leishmania ITS-1 gene sequences obtained from Mentougou District in Beijing Municipality and Xiangning County in Linfen City of Shanxi Province were clustered into the same clade with the reference sequences of L. infantum ITS-1 gene, while the Leishmania ITS-1 gene sequences obtained from Ejin Banner in Alxa League of Inner Mongolia Autonomous Region and Payzawat County in Kashgar City of Xinjiang Uygur Autonomous Region were clustered into the same clade with the reference sequences of L. donovani ITS-1 gene. Conclusions There are variations in sandfly species in selected areas of northern and northwestern China, and variations in the species of Leishmania infecting sandflies. Improved surveillance of sandfly vectors and targeted control strategies with adaptations to geographical features and leishmaniasis vectors are recommended.
4.Research progress on oral microecological imbalance and intervention strategies after radiotherapy for head and neck tumors
LIU Xue ; LI Yufei ; YANG Xinyao ; LI Hao ; ZHANG Ailin ; CUI Lei ; HUANG Zhengwei ; HOU Lili
Journal of Prevention and Treatment for Stomatological Diseases 2026;34(4):385-394
Radiotherapy is a crucial treatment modality for head and neck tumors. However, while effectively killing tumor cells, it significantly disrupts the homeostasis of the oral microecology, which is closely associated with various complications such as radiation-induced oral mucositis. Literature review indicates that as radiotherapy doses accumulate and treatment durations extend, the richness and diversity of the oral microbiota show a declining trend, with the genus Streptococcus decreasing most markedly. In contrast, radiotherapy selectively promotes the proliferation of bacterial phyla such as Proteobacteria and Bacteroidetes, which are rich in opportunistic pathogens. Mechanistically, radiotherapy activates the nuclear factor-kappa B pathway, triggering chronic inflammation and oxidative stress, damaging the epithelial barrier, suppressing local immunity, and causing damage to organs such as the salivary glands. It can also induce systemic diseases via the oral-gut axis, forming a multi-level, interconnected pathogenic network. In terms of interventions, treatment strategies including probiotics and prebiotics have shown promising efficacy against side effects such as radiation-induced oral mucositis. Saliva-based oral microbiota transplantation is an emerging strategy that is expected to become widely utilized for restoring oral microecological balance. Existing interventions provide preliminary pathways for clinical practice, but this field still faces several key scientific questions. The association between oral microecology and systemic diseases remains largely correlative, lacking causal evidence. Furthermore, critical parameters for oral microbiota transplantation, such as donor screening criteria, transplantation protocols, and long-term safety, are not yet well-defined. Therefore, future research should focus on conducting large-scale clinical trials to establish standardized protocols and safety evaluation systems for oral microecological interventions, and explore combined treatment therapies such as probiotics, prebiotics, and microbiota transplantation to advance the development of personalized precision modulation. These will enable more effective management of radiotherapy-induced oral microecological dysbiosis and improve treatment outcomes and quality of life for patients with head and neck tumors.
5.Construction of a Postoperative Prevention and Treatment Model for Breast Cancer Based on the "Disease-Syndrome-Constitution-Trend-Strategy-Efficacy" Framework
Yongjia CUI ; Wenping LU ; Lei CHANG ; Lutian GONG
Journal of Traditional Chinese Medicine 2026;67(5):580-583
In response to the high risk of recurrence and metastasis after breast cancer surgery, this paper proposes a six-dimensional integrated preventive and therapeutic model, namely the "disease-syndrome-constitution-trend-strategy-efficacy" framework, including disease identification, syndrome differentiation, constitution differentiation, trend assessment, strategy implementation, and effect evaluation. This model builds upon the traditional three-dimensional approach of disease identification, syndrome differentiation and constitution differentiation, and introduces "trend" to dynamically capture the evolving tendencies of disease progression and the transformation of syndrome and constitution, thereby operationalizing the concept of "treating before disease onset". The "strategy" dimension enables the organic integration and individualized regulation of TCM and western medical interventions, while the "efficacy" dimension establishes a multidimensional evaluation system integrating TCM and western medicine to assess the efficacy of the "strategy", so as to promote the systematic, dynamic, and precise development of treating before disease onset in TCM.
6.Effects of Tai Chi combined with inspiratory muscle resistance training on cardiopulmonary function among male college students in health care classes
HUANG Xin, YANG Zi, PAN Jinchen,GUO Yangbo, ZHENG Qi, CUI Jianmei, ZHENG Lei
Chinese Journal of School Health 2026;47(9):1261-1266
Objective:
To compare the effects of 12 week Tai Chi combined with inspiratory muscle resistance training on cardiopulmonary function among male college students in health care classes, so as to provide a reference for improving the cardiopulmonary function of the students.
Methods:
From March to May 2025, 72 male students from the physical education health care classes at North University of China were selected and randomly divided into the control group ( n =25), the Tai Chi group ( n = 24), and the Tai Chi combined with inspiratory muscle resistance training group (combined group, n =23) by random number table method. The control group maintained normal living habits, the Tai Chi group underwent 12 weeks of Tai Chi exercise (three sessions per week, 90 minutes per session), and the combined group received 12 weeks of Tai Chi training (three sessions per week, 60 minutes per session) combined with 30 minutes of inspiratory muscle resistance training. Cardiovascular function[heart rate(HR), stroke volume(SV), cardiac output(CO), mean systolic pressure(MSP), mean diastolic pressure(MDP), vascular elastic dilatation coefficient (VDC), total peripheral resistance (TPR), viscosity (V)], pulmonary function [vital capacity (VC), forced vital capacity (FVC), maximum minute ventilation volume (MVV), forced expiratory volume in one second (FEV1), FEV1/FVC] and heart rate variability (HRV) [HR, standard deviation of the normal to normal intervals (SDNN), root mean square successive difference (RMSSD), low frequency (LF), high frequency (HF), LF/HF] of the three groups of subjects were tested before and after the experiment, the data were analyzed using analysis of covariance.
Results:
There were no statistically significant differences in any indicators among the three groups before the intervention ( F =0.00-2.49, all P >0.05). After the intervention, except FEV1/FVC, MDP and V, there were statistically significant differences of pulmonary function, cardiovascular function and HRV indicators among the three groups ( F =4.38-62.93, all P <0.05). Compared with the control group [(VC ( 3.28± 0.30)L, FVC (3.20±0.29)L, MVV (107.01±9.55)L, SV (65.68±2.34)mL, CO (5.36±0.18)L/min, VDC (0.40±0.03), step index (50.64±3.11), MSP (133.17±6.47)mmHg, TPR (1 281.34±100.78)dyn ·s ·cm -5 ], the VC [(3.43±0.24, 3.69±0.21)L], FVC [(3.34±0.16, 3.46±0.20)L], MVV [(112.54±8.95, 117.11±6.37)L], SV [(71.75±4.20, 75.39±3.71)L/time], CO[( 5.53± 0.14, 5.58±0.15)L/min], VDC (0.43±0.03, 0.44±0.02) and step index (53.38±5.77, 56.17±4.91) in the Tai Chi group and the combined group significantly increased, while the MSP [(120.17±6.42, 118.04±12.99)mmHg] and TPR [( 1 227.01 ±107.25, 1 217.69±64.93)dyn ·s ·cm -5 ] significantly decreased (all P <0.05). The HRV showed improvement. Moreover, compared with the Tai Chi group, VC, FVC, MVV, FEV1[(2.99±0.14,3.05±0.15)L], SV, step index, RMSSD[( 45.41± 9.59,52.82±7.67)ms] and HF [(2.74±0.13,2.87±0.16)ms 2] increased, while HR [(77.17±6.01, 73.83± 3.71)beats/min ] decreased in the combined group (all P < 0.05 ).
Conclusion
Twelve weeks of Tai Chi exercise and Tai Chi combined with inspiratory muscle resistance training can improve the cardiopulmonary function of male college students in health care classes, and the effect of the combined training is superior to that of Tai Chi training alone.
7.Expert Consensus on Clinical Application of Qinbaohong Zhike Oral Liquid in Treatment of Acute Bronchitis and Acute Attack of Chronic Bronchitis
Jian LIU ; Hongchun ZHANG ; Chengxiang WANG ; Hongsheng CUI ; Xia CUI ; Shunan ZHANG ; Daowen YANG ; Cuiling FENG ; Yubo GUO ; Zengtao SUN ; Huiyong ZHANG ; Guangxi LI ; Qing MIAO ; Sumei WANG ; Liqing SHI ; Hongjun YANG ; Ting LIU ; Fangbo ZHANG ; Sheng CHEN ; Wei CHEN ; Hai WANG ; Lin LIN ; Nini QU ; Lei WU ; Dengshan WU ; Yafeng LIU ; Wenyan ZHANG ; Yueying ZHANG ; Yongfen FAN
Chinese Journal of Experimental Traditional Medical Formulae 2025;31(4):182-188
The Expert Consensus on Clinical Application of Qinbaohong Zhike Oral Liquid in Treatment of Acute Bronchitis and Acute Attack of Chronic Bronchitis (GS/CACM 337-2023) was released by the China Association of Chinese Medicine on December 13th, 2023. This expert consensus was developed by experts in methodology, pharmacy, and Chinese medicine in strict accordance with the development requirements of the China Association of Chinese Medicine (CACM) and based on the latest medical evidence and the clinical medication experience of well-known experts in the fields of respiratory medicine (pulmonary diseases) and pediatrics. This expert consensus defines the application of Qinbaohong Zhike oral liquid in the treatment of cough and excessive sputum caused by phlegm-heat obstructing lung, acute bronchitis, and acute attack of chronic bronchitis from the aspects of applicable populations, efficacy evaluation, usage, dosage, drug combination, and safety. It is expected to guide the rational drug use in medical and health institutions, give full play to the unique value of Qinbaohong Zhike oral liquid, and vigorously promote the inheritance and innovation of Chinese patent medicines.
8.Association between Modified Yiqi Huoxue Jiedu Formula (益气活血解毒方) or PARP Inhibitors Maintenance Therapy and Recurrence and Metastasis in Advanced Ovarian Cancer:A Propensity Score Matched Case-Control Study
Yongjia CUI ; Wenping LU ; Lei CHANG ; Yilin WEI ; Xiyue WANG
Journal of Traditional Chinese Medicine 2025;66(3):256-261
ObjectiveTo investigate the association between the maintenance treatment of modified Yiqi Huoxue Jiedu Formula (益气活血解毒方) or poly ADP ribose polymerase (PARP) inhibitors and the recurrence and metastasis of advanced ovarian cancer. MethodsA case-control study design was employed, dividing patients with advanced ovarian cancer into two groups based on the occurrence of recurrence and metastasis following first-line maintenance treatment. Patients with recurrence and metastasis comprised the case group, while those without recurrence and metastasis served as the control group. The previous first-line maintenance treatment method was set as the exposure factor in the study (with the use of modified Yiqi Huoxue Jiedu Formula defined as exposed and PARP inhibitors defined as unexposed). Basic information was collected for both groups, including the achievement of satisfactory R0 surgery, age, stage, neoadjuvant chemotherapy, lymph node metastasis, germline BRCA1/2 mutations, homologous recombination deficiency positivity, first-line maintenance treatment method (modified Yiqi Huoxue Jiedu Formula or PARP inhibitors), and CA125 levels after the last chemotherapy. The baseline data of the two groups were assessed for differences. If there exists difference, a 1∶1 nearest neighbor matching method was used for propensity score matching. Univariate and multivariate logistic regression analyses were employed to evaluate the association between the modified Yiqi Huoxue Jiedu Formula or PARP inhibitors and the recurrence and metastasis of ovarian cancer. ResultsA total of 201 patients with advanced ovarian cancer were included, with 97 in the case group and 104 in the control group. Both groups showed statistically significant differences in R0 surgery, stage, neoadjuvant chemotherapy, and CA125 levels after the last chemotherapy (P<0.05), indicating baseline imbalance. After propensity score matching, there were 71 patients in both the case and control groups, achieving baseline balance (P>0.05). Univariate logistic regression analysis indicated that the achievement of satisfactory R0 surgery (P = 0.006), disease stage (P = 0.001), the use of neoadjuvant chemotherapy (P = 0.024), treatment modality (P = 0.006), and CA125 levels after the last chemotherapy (P = 0.013) were associated with the recurrence and metastasis of ovarian cancer. Multivariate logistic regression analysis revealed that disease stage was an independent influencing factor for the recurrence and metastasis of ovarian cancer (P = 0.030), whereas the P-value for the correlation between first-line maintenance treatment and ovarian cancer was 0.188. ConclusionFirst-line maintenance treatment of ovarian cancer patients with the use of modified Yiqi Huoxue Jiedu Formula or PARP inhibitors does not correlate with the recurrence and metastasis of ovarian cancer.
9.Comprehensive analysis of genes related to endometrial receptivity and alternative splicing events in northwest Tibetan cashmere goats
Ji DE ; Langda SUO ; Yuchen WEI ; Bin WANG ; Awangcuoji ; Renqingcuomu ; Jiuzeng CUI ; Lei ZHANG ; Gui BA
Chinese Journal of Tissue Engineering Research 2025;29(7):1429-1436
BACKGROUND:Endometrial receptivity is a key factor in embryo implantation in northwest Tibetan cashmere goats,and the expression of genes related to endometrial receptivity and their variable splicing are still unclear. OBJECTIVE:To analyze and explore genes and variable splicing events related to endometrial receptivity in northwest Tibetan cashmere goats. METHODS:On days 5 and 15 of pregnancy(representing pre receptive endometrium group and receptive endometrium group),three northwest Tibetan cashmere goats were randomly selected.Endometrial tissue was collected and stained with hematoxylin and eosin to observe tissue morphology.Immunohistochemical staining was used to detect the expression of endometrial receptive marker proteins leukemia inhibitory factor and vascular endothelial growth factor.After the total RNA was extracted and the quality test was qualified,transcriptome sequencing was performed to search differentially expressed mRNAs,lncRNAs,circRNAs,and miRNAs,perform functional prediction,and analyze alternative splicing mRNAs and lncRNAs related to endometrial receptivity. RESULTS AND CONCLUSION:(1)Compared with the pre receptive endometrium group,the expression levels of leukemia inhibitory factor and vascular endothelial growth factor proteins in the endometrial tissue of the receptive endometrium group were significantly increased.(2)The sequencing results showed that the differentially expressed genes were mostly mRNA and lncRNA genes,including 250 upregulated mRNAs,193 upregulated lncRNAs,135 downregulated mRNAs,and 123 downregulated lncRNAs,which were significantly enriched in the Wnt,Hedgehog,and Hippo signaling pathways.(3)Alternative splicing event analysis uncovered 8 differentially expressed variable splicing transcripts,which were all mRNA transcripts,including 2 downregulated and 6 upregulated,and were significantly associated with vascular endothelial growth factor receptor signaling,cell motility,and embryonic development.
10.Structural and Spatial Analysis of The Recognition Relationship Between Influenza A Virus Neuraminidase Antigenic Epitopes and Antibodies
Zheng ZHU ; Zheng-Shan CHEN ; Guan-Ying ZHANG ; Ting FANG ; Pu FAN ; Lei BI ; Yue CUI ; Ze-Ya LI ; Chun-Yi SU ; Xiang-Yang CHI ; Chang-Ming YU
Progress in Biochemistry and Biophysics 2025;52(4):957-969
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.


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