1.Clinical Efficacy and Mechanism of Bupi Qingfei Prescription in Treating Stable Bronchiectasis
Zi YANG ; Guangsen LI ; Bing WANG ; Bo XU ; Jianxin WANG ; Sheng CAO ; Xinyan CHEN ; Xia SHI ; Qing MIAO
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(2):162-169
ObjectiveTo explore the clinical efficacy and mechanism of Bupi Qingfei prescription (BPQF) in treating stable bronchiectasis in the patients with syndromes of lung-spleen Qi deficiency and phlegm-heat accumulation in the lungs. MethodsA randomized, double-blind, placebo-controlled trial was conducted. Patients were randomized into BPQF and placebo control (PC) groups. On the basis of conventional Western medicine treatment, the BPQF granules and placebo were respectively administered at 10 g each time, twice a day, for a course of 24 weeks. The TCM symptom scores, Quality of Life Questionnaire for Bronchiectasis (QOL-B) scores, lung function indicators, T lymphocyte subsets, level of inflammatory factors in the sputum, level of neutrophil elastase (NE) in the sputum, and occurrence of adverse reactions were observed before and after treatment in the two groups. ResultsA total of 64 patients completed the study, encompassing 32 in the BPQF group and 32 in the PC group. After treatment, the BPQF group showed decreased TCM symptom scores (P<0.01), increased QOL-B scores (P<0.01), and declined levels of tumor necrosis factor (TNF)-α and NE (P<0.05, P<0.01). The PC group showed decreased TCM symptom (except spleen deficiency) scores (P<0.01), increased the QOL-B health cognition and respiratory symptom domain scores (P<0.05, P<0.01), and a declined TNF-α level (P<0.01). Moreover, the BPQF group had lower TCM symptom (except chest tightness) scores (P<0.05, P<0.01), higher QOL-B (except treatment burden) scores (P<0.05, P<0.01), and lower levels of interleukin-6 and TNF-α (P<0.05) than the PC group. Neither group showed serious adverse reactions during the treatment process. ConclusionBPQF can ameliorate the clinical symptoms of stable bronchiectasis patients who have lung-spleen Qi deficiency or phlegm-heat accumulation in the lungs by regulating the immune balance and inhibiting airway inflammatory responses.
2.Study on the effects and mechanisms of Lycium ruthenicum Murr. in improving sleep
Ming QIAO ; Yao ZHAO ; Yi ZHU ; Yexia CAO ; Limei WEN ; Yuehong GONG ; Xiang LI ; Juanchen WANG ; Tao WANG ; Jianhua YANG ; Junping HU
China Pharmacy 2026;37(1):24-29
OBJECTIVE To investigate the effects and mechanisms of Lycium ruthenicum Murr. in improving sleep. METHODS Network pharmacology was employed to identify the active components of L. ruthenicum and their associated disease targets, followed by enrichment analysis. A caffeine‑induced zebrafish model of sleep deprivation was established , and the zebrafish were treated with L. ruthenicum Murr. extract (LRME) at concentrations of 0.1, 0.2 and 0.4 mg/mL, respectively; 24 h later, behavioral changes of zebrafish and pathological alterations in brain neurons were subsequently observed. The levels of inflammatory factors [interleukin-6 (IL-6), IL-1β, IL-10, tumor necrosis factor-α (TNF-α)], oxidative stress markers [superoxide dismutase (SOD), malondialdehyde (MDA), glutathione peroxidase (GSH-Px), catalase (CAT)], and neurotransmitters [5- hydroxytryptamine (5-HT), γ-aminobutyric acid (GABA), glutamic acid (Glu), dopamine (DA), and norepinephrine (NE)] were measured. The protein expression levels of protein kinase B1 (AKT1), phosphorylated AKT1 (p-AKT1), epidermal growth factor receptor (EGFR), B-cell lymphoma 2 (Bcl-2), sarcoma proto-oncogene,non-receptor tyrosine kinase (SRC), and heat shock protein 90α family class A member 1 (HSP90AA1) in the zebrafish were also determined. RESULTS A total of 12 active components and 176 intersecting disease targets were identified through network pharmacology analysis. Among these, apigenin, naringenin and others were recognized as core active compounds, while AKT1, EGFR and others served as key targets; EGFR tyrosine kinase inhibitor resistance signaling pathway was identified as the critical pathway. The sleep improvement rates in zebrafish of LRME low-, medium-, and high-dose groups were 54.60%, 69.03% and 77.97%, 开发。E-mail:hjp_yft@163.com respectively, while the inhibition ratios of locomotor distance were 0.57, 0.83 and 0.95, respectively. Compared with the model group, the number of resting counts, resting time and resting distance were significantly increased/extended in LRME medium- and high-dose groups (P<0.05). Neuronal damage in the brain was alleviated. Additionally, the levels of IL-6, IL-1β, TNF-α, MDA, Glu, DA and NE, as well as the protein expression levels of AKT1, p-AKT1, EGFR, SRC and HSP90AA1, were markedly reduced (P<0.05), while the levels of IL-10, SOD, GSH-Px, CAT, 5-HT and GABA, as well as Bcl-2 protein expression, were significantly elevated (P<0.05). CONCLUSIONS L. ruthenicum Murr. demonstrates sleep-improving effects, and its specific mechanism may be related to the regulation of inflammatory responses, oxidative stress, neurotransmitter balance, and the EGFR tyrosine kinase inhibitor resistance signaling pathway.
3.Research progress on the anti-nasopharyngeal carcinoma effect of traditional Chinese medicine based on MAPK signaling pathway
Yuanyuan LI ; Yang CAO ; Yuyin JIANG ; Xinyue ZHANG ; Jingbo LI
China Pharmacy 2026;37(1):117-123
Nasopharyngeal carcinoma (NPC) is a malignant tumor originating from the mucosal epithelium of the nasopharynx. In recent years, its incidence and mortality rates have shown a continuous upward trend, and there is still a lack of therapeutic regimens with both favorable efficacy and safety in clinical practice. Mitogen-activated protein kinase (MAPK) signaling pathway plays a key regulatory role in biological processes such as cell proliferation, differentiation, apoptosis and invasion. It is widely involved in the occurrence and progression of NPC, and serves as an important target in the research field of anti-NPC therapy. This article systematically elaborates on the mechanism of action of the MAPK signaling pathway in NPC, and reviews the research status regarding the anti-NPC effect of active components of traditional Chinese medicine (TCM) and TCM compound prescriptions by regulating this signaling pathway. The results show that TCM active components, including flavonoids (luteolin, maackiain, baicalein, etc.), alkaloids (picrasidine Ⅰ, tetrandrine, etc.), terpenoids (bakuchiol, cantharidic acid), as well as traditional Chinese medicine compound formulas (such as Biyan jiedu capsules and Yiqi jiedu formula) can exert effects including inducing autophagy and apoptosis of NPC cells, promoting pyroptosis, reversing drug resistance, blocking epithelial-mesenchymal transition, weakening cell stemness and arresting cell cycle progression by regulating the MAPK signaling pathway, thereby inhibiting the occurrence and development of NPC through multiple pathways.
4.Safety of endoscopic variceal ligation and endoscopic cyanoacrylate injection in treatment of esophagogastric varices in patients with liver cirrhosis and influencing factors for postoperative bleeding
Luyao JIA ; Baoying CAO ; Chunming HUANG ; Biao XIE ; Hongbo GAO ; Chuo LI ; Qinghua HUANG
Journal of Clinical Hepatology 2026;42(2):356-361
ObjectiveTo investigate the risk factors for bleeding within 5 days and 2 weeks after endoscopic variceal ligation (EVL) or endoscopic cyanoacrylate injection (ECI) for the treatment of esophagogastric varices in patients with liver cirrhosis, as well as the safety of EVL/ECI in patients with thrombocytopenia. MethodsA total of 489 patients with liver cirrhosis and esophagogastric varices who underwent EVL/ECI in Guangzhou Eighth People’s Hospital, Guangzhou Medical University, from January 2018 to December 2023 were enrolled as subjects, and according to the presence or absence of bleeding after surgery, they were divided into bleeding group and non-bleeding group. The risk factors for bleeding within 5 days and 2 weeks after surgery were analyzed. The independent-samples t test or the Mann-Whitney U test was used for comparison of continuous data between groups, and the chi-square test or the continuity-corrected chi-square test was used for comparison of categorical data between groups; the receiver operating characteristic (ROC) curve was plotted to determine the cut-off value of MELD score; a multivariate logistic regression analysis was used to identify the independent risk factors for postoperative bleeding. ResultsThere were no significant differences in the bleeding rates within 5 days and 2 weeks after EVL/ECI between the 386 patients with a platelet count of ≥50×109/L and the 103 patients with a platelet count of (25 — 49)×109/L (5 days: 1.94% vs 2.85%, P=0.870; 2 weeks: 2.91% vs 4.92%, P=0.544). The overall bleeding rate was 2.66% (13/489) and 4.50% (22/489), respectively, within 5 days and 2 weeks after EVL/ECI. The multivariate logistic regression analysis showed that MELD score was an independent risk factor for bleeding within 5 days (odds ratio [OR]=3.726, 95% confidence interval [CI]: 1.214 — 11.429, P=0.021) and 2 weeks (OR=5.760, 95%CI: 1.779 — 18.651, P=0.003) after EVL/ECI, while hemoglobin (Hb) was a protective factor against bleeding within 5 days (OR=0.972, 95%CI: 0.948 — 0.996, P=0.025) and 2 weeks (OR=0.976, 95%CI: 0.957 — 0.995, P=0.016) after surgery; portal vein tumor thrombus (OR=2.667, 95%CI: 1.000 — 7.117, P=0.050) was an independent risk factor for bleeding within 2 weeks after surgery, while platelet count [(25 — 49)×10⁹/L] was not a risk factor for postoperative bleeding (P>0.05). ConclusionBoth EVL and ECI have good safety in patients with liver diseases and grade 3 thrombocytopenia. MELD score is an independent risk factor for bleeding within 5 days and 2 weeks after EVL/ECI, while Hb is a protective factor; portal vein tumor thrombus is an independent risk factor for bleeding within 2 weeks after surgery.
5.Guizhi Shaoyao Zhimutang and Active Components of Its Single Herbs in Treatment of Rheumatoid Arthritis: A Review
Jian LIU ; SHIPEIRU ; Shuang LI ; Jinzhao ZHAO ; Naijun CAO ; Mingxiu JIN ; Jing YU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(10):346-354
Rheumatoid arthritis (RA) is a common autoimmune disease characterised clinically by symmetrical joint pain, swelling, and stiffness. Long-term chronic synovial inflammation can lead to severe joint damage and even disability, thereby affecting quality of life for patients. Current clinical treatment of RA emphasises an integrated approach combining traditional Chinese and Western medicine, with traditional Chinese medicine offering certain advantages in reducing disease activity of RA, preventing relapses, and other aspects. Modern clinical evidence confirms that Guizhi Shaoyao Zhimutang (GSZT) is effective in improving symptoms such as immune metabolism, joint stiffness, and joint pain in RA patients. Pharmacological studies have revealed that GSZT primarily contains components such as cinnamaldehyde, total glucosides of paeony, total alkaloids of Aconiti Lateralis Radix Praeparata, glycyrrhetinic acid, zingiberone, isoimperatorin, ephedra polysaccharides, and cedrol. It improves RA symptoms via multiple mechanisms and targets, including enhancing immune responses, exerting anti-inflammatory and analgesic effects, regulating relevant signalling pathways, inhibiting cell apoptosis, and suppressing bone destruction. This paper reviewed the syndrome patterns and pharmacological basis of GSZT in the treatment of RA, as well as its clinical applications and related mechanisms, thereby providing a theoretical basis and reference for the further development and utilisation of GSZT in the treatment of RA.
6.Analysis of blood entry component of Yinchenhao decoction in vivo and study on the anti-hepatocellular carcinoma mechanism by network pharmacology
Linfeng ZHANG ; Yuheng SUN ; Dongyao WANG ; Dan LI ; Yan CAO ; Diya LYU
Journal of Pharmaceutical Practice and Service 2026;44(4):200-208
Objective To improve the analysis method of the blood components of Yinchenhao decoction (YCHD) in vivo and explore its anti-hepatocellular carcinoma mechanism. Methods Ultra-high performance liquid chromatography-quadrupole-time-of-flight mass spectrometry (UPLC-Q-TOF/MS) was used to collect and analyze blood samples from mice. The mice were given a single dose of YCHD with a concentration of 0.1 g/ml and a dose of 25 ml/kg, and then the samples were collected 2 h post–administration, which was to systematically study the chemical components of YCHD in vivo. Network pharmacological methods were used to screen the components and targets of YCHD, and the targets of hepatocellular carcinoma; The common targets of YCHD and hepatocellular carcinoma were identified for GO enrichment and KEGG enrichment. Molecular docking was performed on the main targets to verify the binding ability between the active ingredients and the core targets. The relative mRNA expression levels of serine/threonine-protein kinase(AKT1) and tumor protein p53(TP53) in liver tissues were analyzed via qPCR, including the following mouse groups: mice with concanavalin A(Con-A)-induced acute liver injury without preventive administration, mice with Con-A-induced acute liver injury that received 14 d preventive oral administration of YCHD, and untreated control mice. Results ①The active ingredients of YCHD in the blood were identified by retrieving the data from the in vitro component analysis. They were chrysophanol, herniarin, aloe-emodin, and monotropein. ②The mechanism of action of the blood components against hepatocellular carcinoma (HCC) was further analyzed using network pharmacological methods, and a total of 30 components of YCHD were screened for 213 targets and 215 HCC targets. ③There were 17 intersection targets between YCHD and hepatocellular carcinoma, including AKT1, TP53, receptor tyrosine-protein kinase erbB-2 (ERBB2), myelocytomatosis oncogene (MYC), interleukin-1β (IL-1β), etc. The GO enrichment results indicated that these components were primarily involved in DNA replication,chromosome segregation,leukocyte mediated immunity,leukocyte cell-cell adhesion. The KEGG enrichment results demonstrated that these components were predominantly associated with diverse cancer pathways. Additionally, the results indicated involvement in the citrate cycle (TCA cycle), pyruvate metabolism, and p53 signaling pathway, ect. ④The results of molecular docking showed that chrysophanol, herniarin, and aloe - emodin had strong binding abilities with AKT1, TP53, ERBB2, MYC, and IL-1β. ⑤The relative expression of AKT1 and TP53 mRNA was significantly higher in the modelling group than in the control group. The relative expression of AKT1 and TP53 mRNA was significantly lower in the drug administration group than in the modelling group. Conclusion There were 4 blood components in YCHD, among which chrysophanol, herniarin, and aloe-emodin may act on AKT1, TP53, ERBB2, MYC, IL-1β and then participated in the regulation of cancer signaling pathways and p53 signaling pathway to play a role in the treatment of HCC.
7.Guizhi Shaoyao Zhimutang and Active Components of Its Single Herbs in Treatment of Rheumatoid Arthritis: A Review
Jian LIU ; SHIPEIRU ; Shuang LI ; Jinzhao ZHAO ; Naijun CAO ; Mingxiu JIN ; Jing YU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(10):346-354
Rheumatoid arthritis (RA) is a common autoimmune disease characterised clinically by symmetrical joint pain, swelling, and stiffness. Long-term chronic synovial inflammation can lead to severe joint damage and even disability, thereby affecting quality of life for patients. Current clinical treatment of RA emphasises an integrated approach combining traditional Chinese and Western medicine, with traditional Chinese medicine offering certain advantages in reducing disease activity of RA, preventing relapses, and other aspects. Modern clinical evidence confirms that Guizhi Shaoyao Zhimutang (GSZT) is effective in improving symptoms such as immune metabolism, joint stiffness, and joint pain in RA patients. Pharmacological studies have revealed that GSZT primarily contains components such as cinnamaldehyde, total glucosides of paeony, total alkaloids of Aconiti Lateralis Radix Praeparata, glycyrrhetinic acid, zingiberone, isoimperatorin, ephedra polysaccharides, and cedrol. It improves RA symptoms via multiple mechanisms and targets, including enhancing immune responses, exerting anti-inflammatory and analgesic effects, regulating relevant signalling pathways, inhibiting cell apoptosis, and suppressing bone destruction. This paper reviewed the syndrome patterns and pharmacological basis of GSZT in the treatment of RA, as well as its clinical applications and related mechanisms, thereby providing a theoretical basis and reference for the further development and utilisation of GSZT in the treatment of RA.
8.Genetic disease diagnosis and treatment in Shanghai: Survey and countermeasures for clinical genetics specialist training.
Xiaoju HUANG ; Lin HAN ; Li CAO ; Taosheng HUANG ; Duan MA ; Jian WANG ; Wenjuan QIU ; Fanyi ZENG ; Luming SUN ; Chenming XU ; Songchang CHEN ; Xinyu KUANG ; Hong TIAN
Chinese Journal of Medical Genetics 2026;43(4):241-247
OBJECTIVE:
To investigate the current status of clinical genetics specialization development and the diagnostic and therapeutic capabilities for hereditary diseases across medical institutions in Shanghai, and to assess the necessity and feasibility of establishing training bases for clinical genetics specialists.
METHODS:
By employing a cross-sectional survey design, the Clinical Genetics Committee of Shanghai Medical Association has conducted questionnaire surveys from March to April 2025 across 54 healthcare institutions in Shanghai (including 33 tertiary hospitals and 21 secondary hospitals). The survey involved administrative departments and medical personnel from 15 clinical specialties. The survey has covered current genetic disease diagnosis and treatment practices, relevant and specialised disease types, genetic department establishment, testing capabilities, personnel teams, and training requirements.
RESULTS:
The results revealed that 78.0% of clinical departments surveyed had treated patients with hereditary disorders. Shanghai possesses diagnostic and therapeutic expertise for over 95% of hereditary diseases listed in its rare disease catalogue, reflecting both the practical clinical demand for such conditions and the city's overall diagnostic and therapeutic strengths in this field. Nevertheless, significant disparities exist in the development of genetics departments across different tiers of healthcare institutions. Resources for genetic testing capabilities (including molecular, cellular, and biochemical testing) are also unevenly distributed across different tiers of hospitals. The survey further revealed that only 26.0% of departments believe that their current physician structure fully meets the diagnostic and treatment demands. Over 90% of departments consider standard training for clinical genetic specialists necessary, with 74.0% expressing willingness to participate in establishing training bases. Based on above findings and thorough deliberation, the Clinical Genetics Committee of the Shanghai Medical Association proposes advancing specialist training and discipline development through establishing a standard training system. The committee has drafted a three-year training protocol featuring a "joint training"-centered model, recommending a pilot-first, dynamically optimized strategy for steadily advancing training base development.
CONCLUSION
Shanghai faces substantial demand for genetic disease diagnosis and treatment, yet exhibits shortcomings in clinical genetics specialization development, resource allocation, and talent pipeline cultivation. To establish a standard training system holds significant practical importance and is underpinned by a broad demand.
Humans
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China
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Surveys and Questionnaires
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Genetic Diseases, Inborn/genetics*
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Cross-Sectional Studies
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Genetics, Medical/education*
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Genetic Testing
9.Effects of Modified Buyang Huanwu Tang on Mice with Cerebral Ischemia-reperfusion Injury by Regulating PINK1/Parkin Signaling Pathway-mediated Mitochondrial Autophagy
Li GUO ; Hengwen CHEN ; Cun ZHAN ; Zhenzhen YING ; Zuomin WU ; Shaoju JIN ; Shangmei CAO ; Shengming HUANG ; Jin WANG ; Xiaotao YU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(11):34-43
ObjectiveTo investigate the effects of modified Buyang Huanwu Tang on cerebral ischemia-reperfusion injury (CI/RI) in mice via the PTEN-induced putative kinase 1/E3 ubiquitin ligase (PINK1/Parkin) signaling pathway-mediated mitophagy, and to explore the underlying mechanism by which modified Buyang Huanwu Tang improves CI/RI. MethodsSeventy-two male C57BL/6J mice were randomly divided into six groups (n = 12 per group): Sham-operated group, middle cerebral artery occlusion/reperfusion (MCAO/R) model group, low-, medium-, and high-dose modified Buyang Huanwu Tang groups (8.84, 17.68, 35.36 g·kg-1·d-1), and an aspirin group (13.00 mg·kg-1·d-1). Neurological deficit scores were assessed using the Zea-Longa method. Cerebral infarct volume ratio was measured by 2,3,5-triphenyltetrazolium chloride (TTC) staining. Histopathological changes and neuronal injury in brain tissues were observed using hematoxylin-eosin (HE) staining and Nissl staining. Apoptosis was detected by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling (TUNEL) assay. Mitochondrial ultrastructure in brain tissue was observed by transmission electron microscopy (TEM). Serum levels of superoxide dismutase (SOD) and malondialdehyde (MDA) were determined by enzyme-linked immunosorbent assay (ELISA). The mRNA and protein expression levels of PINK1, Parkin, microtubule-associated protein 1 light chain 3B (LC3B, LC3Ⅱ/Ⅰ), and p62 in brain tissues were detected by real-time quantitative reverse transcription PCR (Real-time PCR) and Western blot, respectively. ResultsCompared with the sham-operated group, the MCAO/R model group showed significantly increased neurological deficit scores and cerebral infarct volume ratios (P<0.01). Severe cortical injury on the infarct side was observed, characterized by decreased neuronal density, cytoplasmic vacuolation, nuclear pyknosis, a marked reduction in Nissl bodies, dissolution of Nissl bodies in the cytoplasm of some pyramidal neurons, and blurred cellular boundaries. The number of TUNEL-positive cells increased significantly (P<0.01). Mitochondria exhibited cristae membrane rupture and matrix vacuolation, with rupture of the outer mitochondrial membrane and formation of autophagosomes, the number of which increased significantly. Serum SOD activity decreased significantly (P<0.01), while MDA content increased significantly (P<0.01). In infarcted brain tissues of model mice, the relative mRNA expression and protein levels of PINK1, Parkin and LC3B were significantly increased (P<0.05, P<0.01), whereas p62 mRNA and protein expression were significantly decreased (P<0.05, P<0.01), showing statistical significance. Compared with the model group, all treatment groups showed significantly decreased neurological deficit scores and cerebral infarct volume ratios (P<0.01). Neuronal density increased significantly, cytoplasmic vacuolation was alleviated, nuclear morphology tended to be more regular and clearer, Nissl body density increased significantly with reduced dissolution and improved contour clarity. The mitochondrial cristae structure was partially restored, with some mitochondria showing autophagosome encapsulation, and the degree of mitochondrial damage was alleviated. Serum SOD activity increased significantly (P<0.01), while MDA content decreased significantly. The mRNA and protein expression levels of PINK1, Parkin, and LC3Ⅱ/Ⅰ were significantly increased (P<0.05, P<0.01), while p62 mRNA and protein expression in the low- and medium-dose modified Buyang Huanwu Tang groups were significantly decreased (P<0.05, P<0.01), showing statistical significance. ConclusionModified Buyang Huanwu Tang can upregulate the protein expression levels of PINK1, Parkin, and LC3Ⅱ/Ⅰ and downregulate p62 protein expression, suggesting that it may improve CI/RI by regulating the expression of proteins related to the PINK1/Parkin signaling pathway. Regulation of the mitophagy pathway may be one of the mechanisms by which modified Buyang Huanwu Tang alleviates CI/RI in mice.
10.Factors affecting and identification of key environmental determinants of the Oncomelania hupensis snail density in the Yangtze River Delta based on machine learning models
Yinlong LI ; Qin LI ; Suying GUO ; Shizhen LI ; Lijuan ZHANG ; Chunli CAO ; Jing XU
Chinese Journal of Schistosomiasis Control 2026;38(1):14-19
Objective To identify factors affecting and key environmental factors of the Oncomelania hupensis snail density in the Yangtze River Delta region using machine learning methods. Methods Administrative village-level O. hupensis snail survey data in the Yangtze River Delta (including Shanghai Municipality, Jiangsu Province, Zhejiang Province and Anhui Province) from 2011 to 2021 were retrieved from the Information Management System for Parasitic Disease Control of Chinese Center for Disease Control and Prevention. Environmental factor data were captured from the Google Earth Engine platform, including elevation, slope, terrain, normalized difference vegetation index (NDVI), vegetation type, soil type, total petroleum hydrocarbon (TPH), ammonium nitrogen, inorganic nitrogen, dissolved oxygen, pH of water, chemical oxygen demand (COD) and inorganic phosphorus, and climatic factor data in the study region were retrieved from the Copernicus Climate Data Store, including annual precipitation, aridity index and annual mean temperature (AMT). O. hupensis snail survey data in the Yangtze River Delta region from 2011 to 2021 were randomly divided into a training set (70%) and a test set (30%), and five machine learning models were selected for machine learning model construction and comparative analysis of the O. hupensis snail density using the software R 4.3.0, including random forest (RF), eXtreme gradient boosting (XGBoost), support vector machine (SVM), gradient boosting machine (GBM) and neural network (NN). The XGBoost model was employed to construct a predictive model for the O. hupensis snail density, and the impact of each environmental factor on O. hupensis snail distribution was quantified. The SHapley Additive exPlanations (SHAPs) values were calculated to estimate the average contribution of each variable to the model prediction, and the core environmental factors affecting the O. hupensis snail population density were screened. Results Among the five machine learning models, the XGBoost model exhibited the optimal comprehensive performance, with the coefficient of determination (R2) of 0.855, mean squared error (MSE) of 0.188, root mean squared error (RMSE) of 0.434 and mean absolute error (MAE) of 0.155, respectively. Analysis of factors affecting the O. hupensis snail density with the XGBoost model showed that among the 16 environmental factors, the top four high-impact factors ranked by SHAPs values included annual precipitation, elevation, aridity index and NDVI, with cumulative SHAPs contributions of 75%, which was higher than that of other environmental factors. If NDVI was higher than 0.6, the O. hupensis snail density increased with NDVI and peaked if NDVI was 0.8 (1.60 snails/0.1 m2). The O. hupensis snail density increased with elevation if the elevation ranged from 14 to 40 m, and slowly rose if the annual precipitation ranged from 900 to 1 300 mm, and then increased rapidly to the peak (1.52 snails/0.1 m2) if the annual precipitation ranged from 1 300 to 1 500 mm. In addition, the O. hupensis snail density increased rapidly to the maximum (1.60 snails/0.1 m2) if the aridity index ranged from 0.8 to 1.1, and decreased gradually if the aridity index exceeded 1.1. Conclusions The XGBoost model shows excellent performance in prediction of the O. hupensis snail density and identification of key environmental factors in the Yangtze River Delta region. Annual precipitation, elevation, aridity index and NDVI are key environmental factors affecting the distribution and density of O. hupensis snails in the Yangtze River Delta region.

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