1.Expression and clinical significance of ARTN in prostate cancer
Rong LI ; Junfeng JING ; Can WEI
Acta Universitatis Medicinalis Anhui 2026;61(3):448-454
ObjectiveTo explore the clinical significance of artemin (ARTN) expression in prostate cancer (PCa) tissues and its impact on the malignant behavior of PCa cell lines. MethodsImmunohistochemistry was used to detect the expression of ARTN protein in 40 benign prostate tissues and 91 PCa tissues, and its relationship with the clinical and pathological characteristics of PCa was analyzed. PCa stable cell lines with ARTN knockdown were constructed, and the effects of ARTN on the proliferation, migration, and invasion ability of PCa cells were detected via CCK-8 cell proliferation assay and Transwell assay. Western blot assay was used to detect the effect of ARTN on the expression of epithelial-mesenchymal transition (EMT) related markers E-cadherin, N-cadherin, Vimentin, and Snail family transcription inhibitory factor 1 (Snail-1). ResultsARTN was highly expressed in PCa and correlated with Gleason score, local lymph node metastasis, and local nerve invasion (P0.05). Survival analysis showed a statistically significant difference in survival rates between ARTN positive and negative patients (P=0.027). The results of CCK-8 and Transwell assay showed that the knockdown of ARTN could inhibit the proliferation, migration, and invasion ability of PCa cells (all P0.05). Western blot results showed that the knockdown of ARTN upregulated the epithelial marker E-cadherin in PCa cells, while the mesenchymal markers N-cadherin, Snail-1, and Vimentin were downregulated. ConclusionARTN is highly expressed in PCa and can promote the proliferation, migration, invasion ability of PCa cells, as well as increasing EMT levels in PCa cells, suggesting it may be a potential target for the diagnosis and treatment of PCa.
2.Effects of loganin on inflammatory response and intestinal barrier damage in septic rats
Can WANG ; Yantao LI ; Zheng ZHOU ; Lupeng WANG ; Yuanyuan GAO ; Shaoxi FAN
China Pharmacy 2025;36(5):574-578
OBJECTIVE To investigate the effects of loganin on inflammatory response and intestinal barrier damage in septic rats by regulating the Ras homolog gene family member A (RhoA)/Rho-associated coiled-coil forming protein kinase 1 (ROCK1) signaling pathway. METHODS A sepsis rat model was established by cecal ligation and puncture, and randomly divided into sepsis group, loganin low-dose group (50 mg/kg loganin, gavage), loganin high-dose group (200 mg/kg loganin, gavage), positive control group (0.2 mg/kg atorvastatin, intraperitoneal injection), and loganin high-dose + lysophosphatidic acid (LPA) group (200 mg/kg loganin gavage and intraperitoneal injection of 10 mg/kg RohA activator LPA). An additional sham surgery group was established. Each group consisted of 10 rats, and medications were administered once every 6 hours for 4 times. After 24 hours of the last intervention, the levels of serum inflammatory factors interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α), and IL-1β were detected. The pathological changes of ileal tissue were observed and Chiu’s intestinal mucosal injury score was also performed. The levels of intestinal function-lactate dehydrogenase (D-lactate), D-amino acid oxidase (DAO) and endotoxin, the percentages of zonula occludens-1 protein (ZO-1) and Occludin positive staining area, as well as protein expressions of RhoA, and ROCK1 were all detected. com RESULTS Compared with the sepsis group, the percentages of ZO-1 and Occludin positive areas increased significantly in loganin low-dose and high-dose groups; while the levels of IL-6, TNF-α, IL-1β, DAO, D-lactate and endotoxin, Chiu’s intestinal mucosal injury score as well as protein expressions of RhoA and ROCK1 decreased significantly (P<0.05); the destruction of rat ileal tissue was alleviated, and tissue edema and inflammatory infiltration were significantly reduced; moreover, the improvement effect in loganin high-dose group was superior to that in loganin low-dose group (P<0.05). Compared with loganin high-dose group, RhoA activator LPA reversed the trend of changes in the above indicators (P<0.05). CONCLUSIONS Loganin can alleviate inflammatory response and intestinal barrier damage in septic rats, the mechanism of which may be associated with inhibiting RhoA/ROCK1 signaling pathway.
3.Clinical application and research progress of anterior chamber depth in cataract surgery
International Eye Science 2025;25(9):1441-1447
The anterior chamber(AC), a space bounded anteriorly by the cornea and posteriorly by the iris and the lens in the pupillary zone, is one of the most significant parameters in the anterior segment of the eye clinically. It is closely associated with the pathogenesis, progression, and treatment of various ocular diseases. Accurate preoperative assessment and utilization of anterior chamber depth(ACD)before surgery are crucial for achieving optimal postoperative visual outcomes. The term, effective lens position(ELP), has been introduced in recent years to better describe the postoperative position of the intraocular lens(IOL). To enhance the comprehension of ACD and ELP, this review elaborates on their definitions and interrelationship. It enumerates preoperative ACD measurement methodologies and compares the applicability of different devices. Furthermore, the review synthesizes its application on IOL power calculation and ELP prediction, recommending optimized formulas such as the Kane formula for scenarios with atypical ACD. The discussion extends to the impact of abnormal ACD on postoperative visual quality and relevant intraoperative interventions, aiming to provide evidence-based references for clinical practice.
4.Influence of chronic psychological stress during pregnancy on intestinal flora and eczema incidence of offspring rats
Chunyan WANG ; Ying GAO ; Deguang YANG ; Rui WANG ; Hongyu LI ; Ye LI ; Can LIU ; Suzhen GUAN
Journal of Environmental and Occupational Medicine 2025;42(8):962-970
Background Prenatal chronic psychological stress may increase the risk of allergic diseases in children, and eczema is the most common allergic disease in children, the pathogenesis of which is not yet fully understood. Objective To preliminarily clarify the changes in offspring intestinal flora after chronic stress exposure during pregnancy in rats that increases offspring immune imbalance and eczema susceptibility. Methods Thirty SPF-grade adult female SD rats were selected and randomly divided into a model group and a control group (n=15). Sixteen male rats were randomly divided into a model mating group and a control mating group (n=8). A 28-day chronic unpredictable mild stress (CUMS) model during pregnancy was established. On the 7th day of stress, male and female rats were caged in a ratio of 3:1. Blood samples were collected from female rats in each group via angular vein on the 1st day before stress, and on the 7th, 14th, 21st, and 28th days after stress. The content of plasma corticosterone during pregnancy was determined by enzyme-linked immunosorbent assay (ELISA). For the offspring rats, an eczema model was constructed using 2,4-dinitrochlorobenzene (DNCB). The number of scratching times of the offspring rats within 5 min was recorded. The offspring rats were divided into 4 groups: DNCB-CUMS group (MM), DNCB-control group (MC), solvent control-CUMS group (CM), and blank control group (CC), with 8 rats in each group. The eczema was induced once every 3 days, and the induction period was 12 d. The expression level of immunoglobulin E (IgE) in the serum of offspring rats after the eczema induction experiment were determined by ELISA. The concentrations of tumor necrosis factor-α (TNF-α), interferon-γ (IFN-γ), interleukin-2 (IL-2), interleukin-4 (IL-4), and interleukin-13 (IL-13) in the serum were quantified by multi-parameter flow cytometry. The composition and abundance of intestinal microbiota in the feces of offspring rats were detected by 16S rRNA high-throughput sequencing technology. Results The plasma corticosterone concentrations in the model group were higher than those in the control group on the 7th and 21st days of stress (P<0.05). On the 14th and 21st days of stress, the 1% sucrose preference percentages of female rats in the model group were lower than that in the control group. On the 7th, 14th, and 21st days of stress, the horizontal movement scores of female rats in the model group and the vertical movement scores on the 7th and 14th days were lower than those in the control group (P<0.05). After 6, 9, and 12 d of model building, the scratching frequencies in the MC group and MM group were significantly higher than those in the CC group and CM group (P<0.05). Moreover, there were differences in the contents of cytokines including IFN-γ, IL-2, TNF-α, IL-4, IL-13, and IgE among the offspring rat groups (P<0.05). The CM group and MM group led to an increase in the contents of TNF-α, IL-4, IL-13, and IgE cytokines (P<0.05), while the MM group caused a decrease in the contents of IFN-γ and IL-2 (P<0.05). After the eczema induction experiment, the α-diversity analysis showed that the Simpson index and Shannon index in the CM were higher than those in the CC (P<0.05), indicating that CUMS during the pregnancy of female rats could increase the species abundance of their offspring. The abundances of Prevotella and Lactobacillus in the CM group decreased (P<0.05). Conclusion Intestinal dysbiosis in offspring due to chronic prenatal psychological stress, which may be one of the mechanisms linking maternal stress to immune imbalance and increased susceptibility to eczema in offspring.
5.Prescribing rate, healthcare utilization, and expenditure of older adults using potentially inappropriate medications in China: A nationwide cross-sectional study.
Zinan ZHAO ; Mengyuan FU ; Can LI ; Zhiwen GONG ; Ting LI ; Kexin LING ; Huangqianyu LI ; Jianchun LI ; Weihang CAO ; Dongzhe HONG ; Xin HU ; Luwen SHI ; Xiaodong GUAN ; Pengfei JIN
Chinese Medical Journal 2025;138(23):3163-3167
BACKGROUND:
The use of potentially inappropriate medications (PIMs) is a major concern for medication safety as it may entail more harm than potential benefits for older adults. This study aimed to explore the prescribing rate, healthcare utilization, and expenditure of older adults using PIMs in China.
METHODS:
A cross-sectional analysis was conducted using a national representative database of all medical insurance beneficiaries across China, extracting ambulatory visit records of adults aged 65 years and above between 2015 and 2017. Descriptive analysis was conducted to measure the rate of patients exposed to PIM, prescribing rate of each PIM, average annual outpatient visits per patient, average total medication costs for each visit, average annual cost of PIMs for each patient, and average annual medication costs for each patient. Generalized linear model with logit link function and binomial distribution was used to examine the adjusted associations between PIMs and independent variables.
RESULTS:
In total, 845,278 (33.2%) participants were identified to be exposed to at least one PIM. Patients aged 75-84 years (38.1%, 969,809/2,545,430) and ≥85 years (37.9%, 964,718/2,545,430) were more likely to be prescribed with PIMs. Beneficiaries of the Urban Employee Basic Medical Insurance (UEBMI) and living in eastern and southern regions were more frequently prescribed with PIMs. Compared with patients without PIM exposure (7.5 visits, drug cost of RMB 1545.0 Yuan), patients with PIM exposure showed higher adjusted average annual number of outpatient visits (10.7 visits, β = 3.228, 95% confidence interval [CI] = 3.196-3.261) and higher annual drug costs (RMB 2461.8 Yuan, Coef. = 916.864, 95% CI = RMB 906.292-927.436 Yuan).
CONCLUSIONS
The results showed that the use of PIM among older adults was common in China. This study suggests that the use of PIM could be considered as a clear target, pending multidimensional efforts, to promote rational prescribing for older adults.
Humans
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Aged
;
Cross-Sectional Studies
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Aged, 80 and over
;
Male
;
Female
;
China
;
Inappropriate Prescribing/economics*
;
Patient Acceptance of Health Care/statistics & numerical data*
;
Potentially Inappropriate Medication List/statistics & numerical data*
;
Health Expenditures/statistics & numerical data*
6.Effect of Eucommiae Cortex extract mediated by ERβ/JNK pathway on learning and memory ability of APP/PS1 double-transgenic mice.
Yue LI ; Li-Li ZHANG ; Can ZHAO ; Hong-Mei ZHAO ; Yan WANG ; Jin-Lei FU ; Jie ZHANG ; Ning ZHANG ; Hong-Dan XU
China Journal of Chinese Materia Medica 2025;50(2):285-293
To study the ameliorative effect of Eucommiae Cortex extract on spatial learning disabilities in APP/PS1 double-transgenic mice and explore its relationship with estrogen receptor β(ERβ)/c-Jun N-terminal kinase(JNK) signaling pathway, sixty 3-month-old male APP/PS1 mice were randomly divided into a model group, an anti-brain failure capsule group(0.585 g·kg~(-1)), a donepezil hydrochloride group(0.65 mg·kg~(-1)), and a Eucommiae Cortex extract group(1.3 g·kg~(-1)), and 15 C57BL/6 mice of the same genetic background were set as WT control group. The learning and memory ability of mice was assessed by the Morris water maze test(MWM), the passive avoidance test(PAT), and the novel object recognition test(NOR). The histomorphological and cellular ultrastructural features of the hippocampal region of the mice were observed by hematoxylin-eosin(HE) staining and transmission electron microscopy(TEM); the molecular docking validation of the key active ingredients and the key targets was performed by using AutoDock Vina software, and the immunohistochemical method(IHC) was used to detect the ERβ expression in the dentate gyrus(DG) area of mouse hippocampus. Western blot(WB) was utilized to detect the expression of ERβ, p-JNK, and JNK in mouse hippocampal area. Compared with those in the WT control group, the results of behavioral experiments showed that the latency of the mice in the model group was significantly increased, the number of platform traversals, and the target quadrant residence time were significantly decreased in the MWM. The evasion latency was significantly reduced, and the number of errors was significantly increased in the PAT. The index of recognition of novel objects was significantly reduced in the NOR. The results of HE staining indicated that the hippocampal area of mice in the model group showed a decrease in the number of neurons, disorganization of pyramidal cell arrangement, nucleus consolidation, and other changes. TEM results showed that some neuronal nuclei in the hippocampal area had a consolidated state, slightly thickened and aberrant nuclear membranes, and fewer intracytoplasmic nidus bodies; the IHC results showed that the expression of ERβ in the hippocampal DG area of the mice was reduced. The WB results showed that the ERβ expression in the hippocampal tissue was decreased, and the p-JNK/JNK level was elevated. Compared with the model group, the Eucommiae Cortex extract group showed a significant decrease in latency, and increase in number of platform traversals and target quadrant residence time in the MWM, a significant increase in evasion latency and decrease in number of errors in the PAT, and a significant increase in the index of recognition of novel objects in the NOR. In addition, there was an increase in the number of neurons in the hippocampal area of mice. The pyramidal cells tended to be arranged in an orderly manner; the nuclei of neurons in the hippocampal area were in a better state; the expression of ERβ in the hippocampal DG area of the mice was elevated; the expression of ERβ in the hippocampal tissue was elevated, and the level of p-JNK/JNK was reduced. The effects of donepezil hydrochloride group and anti-brain failure capsule on APP/PS1 mice in terms of behavioral, HE, and TEM indexes were similar to those of Eucommiae Cortex extract, and there was no significant difference between donepezil hydrochloride group and the model group in IHC and WB experiments, and the results of molecular docking indicated that the estrogen-like components in Eucommiae Cortex extract were tightly bound to ERβ. In conclusion, the binding of Eucommiae Cortex extract to estrogen receptors, regulation of ERβ expression, and activation of ERβ/JNK signaling pathway may be one of the key mechanisms by which it improves the learning and memory ability of APP/PS1 mice.
Animals
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Male
;
Mice
;
Mice, Transgenic
;
Memory/drug effects*
;
Mice, Inbred C57BL
;
Estrogen Receptor beta/genetics*
;
Eucommiaceae/chemistry*
;
Alzheimer Disease/psychology*
;
Amyloid beta-Protein Precursor/metabolism*
;
Presenilin-1/metabolism*
;
Humans
;
MAP Kinase Signaling System/drug effects*
;
Drugs, Chinese Herbal/administration & dosage*
;
Hippocampus/metabolism*
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Maze Learning/drug effects*
;
Learning/drug effects*
7.Mechanisms of puerarin-mediated lipid modulation to enhance glucose-lowering effects via hepatic ChREBP/PPARα/PPARγ in vitro.
Can CUI ; Han-Yue XIAO ; Li-Ke YAN ; Zhong-Hua XU ; Wei-Hua LIU ; Hui-Ping LI ; Jun TU
China Journal of Chinese Materia Medica 2025;50(14):3951-3961
This study aims to investigate the in vitro mechanisms underlying the beneficial effects of puerarin on hepatic insulin resistance(IR) based on the carbohydrate response element-binding protein(ChREBP)/peroxisome proliferator-activated receptor(PPAR)α/PPARγ axis involved in glucose and lipid metabolism. An IR-HepG2 cell model was established by treating cells with dexamethasone for 48 h, and the cells were then treated with 10, 20, and 40 μmol·L~(-1) puerarin for 24 h. Glucose levels and output in the extracellular fluid were measured by the glucose oxidase method, while cell viability was assessed by the cell counting kit-8(CCK-8) assay. The adenosine triphosphate(ATP) content and glycogen synthesis were evaluated through chemiluminescence and periodic acid-Schiff staining, respectively. Western blot was employed to quantify the protein levels of forkhead box protein O1(FoxO1), phosphorylated forkhead box protein O1 [p-FoxO1(Ser256)], glucagon, phosphofructokinase, liver type(PFKL), pyruvate kinase L-R(PKLR), pyruvate dehydrogenase complex 1(PDHA1), insulin receptor substrate 2(IRS2), phosphatidylinositol 3-kinase p85(PI3KR1), phosphorylated protein kinase B [p-Akt(Thr308)], glycogen synthase(GYS), glycogen phosphorylase, liver type(PYGL), adiponectin(ADPN), ChREBP, PPARα, and PPARγ. Additionally, the protein levels of acetyl-CoA carboxylase 1(ACC1), phosphorylated ATP citrate lyase [p-ACLY(Ser455)], sterol regulatory element binding protein 1c(SREBP-1c), peroxisome proliferator-activated receptor gamma coactivator 1α(PGC1α), carnitine palmitoyltransferase 1α(CPT1α), and glucagon receptor(GCGR) were also determined. Immunofluorescence was employed to visualize the expression and nuclear location of ChREBP/PPARα/PPARγ. Furthermore, quantitative PCR with the antagonists GW6471 and GW9662 was employed to assess Pparα, Pparγ, and Chrebp. The findings indicated that puerarin effectively reduced both the glucose level and glucose output in the extracellular fluid of IR-HepG2 cells without obvious effect on the cell viability, and it increased intracellular glycogen and ATP levels. Puerarin down-regulated the protein levels of FoxO1 and glucagon while up-regulating the protein levels of p-FoxO1(Ser256), PFKL, PKLR, PDHA1, IRS2, PI3KR1, p-Akt(Thr308), GYS, PYGL, ADPN, ACC1, SREBP-1c, p-ACLY(Ser455), PGC1α, CPT1α, and GCGR in IR-HepG2 cells. Furthermore, puerarin up-regulated both the mRNA and protein levels of ChREBP, PPARα, and PPARγ and promoted the translocation into the nucleus. GW6471 was observed to down-regulate the expression of Pparα while up-regulating the expression of Chrebp and Pparγ. GW9662 down-regulated the expression of Pparγ while up-regulating the expression of Pparα, with no significant effect on Chrebp. In summary, puerarin activated the hepatic ChREBP/PPARα/PPARγ axis, thereby coordinating the glucose and lipid metabolism, promoting the conversion of glucose to lipids to exert the blood glucose-lowering effect.
Isoflavones/pharmacology*
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Humans
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PPAR gamma/genetics*
;
Hep G2 Cells
;
Glucose/metabolism*
;
Lipid Metabolism/drug effects*
;
PPAR alpha/genetics*
;
Liver/drug effects*
;
Basic Helix-Loop-Helix Leucine Zipper Transcription Factors/genetics*
;
Insulin Resistance
8.Development of a machine learning-based risk prediction model for mild cognitive impairment with spleen-kidney deficiency syndrome in the elderly.
Ya-Ting AI ; Shi ZHOU ; Ming WANG ; Tao-Yun ZHENG ; Hui HU ; Yun-Cui WANG ; Yu-Can LI ; Xiao-Tong WANG ; Peng-Jun ZHOU
Journal of Integrative Medicine 2025;23(4):390-397
OBJECTIVE:
As an age-related neurodegenerative disease, the prevalence of mild cognitive impairment (MCI) increases with age. Within the framework of traditional Chinese medicine, spleen-kidney deficiency syndrome (SKDS) is recognized as the most frequent MCI subtype. Due to the covert and gradual onset of MCI, in community settings it poses a significant challenge for patients and their families to discern between typical aging and pathological changes. There exists an urgent need to devise a preliminary diagnostic tool designed for community-residing older adults with MCI attributed to SKDS (MCI-SKDS).
METHODS:
This investigation enrolled 312 elderly individuals diagnosed with MCI, who were randomly distributed into training and test datasets at a 3:1 ratio. Five machine learning methods, including logistic regression (LR), decision tree (DT), naive Bayes (NB), support vector machine (SVM), and gradient boosting (GB), were used to build a diagnostic prediction model for MCI-SKDS. Accuracy, sensitivity, specificity, precision, F1 score, and area under the curve were used to evaluate model performance. Furthermore, the clinical applicability of the model was evaluated through decision curve analysis (DCA).
RESULTS:
The accuracy, precision, specificity and F1 score of the DT model performed best in the training set (test set), with scores of 0.904 (0.845), 0.875 (0.795), 0.973 (0.875) and 0.973 (0.875). The sensitivity of the training set (test set) of the SVM model performed best among the five models with a score of 0.865 (0.821). The area under the curve of all five models was greater than 0.9 for the training dataset and greater than 0.8 for the test dataset. The DCA of all models showed good clinical application value. The study identified ten indicators that were significant predictors of MCI-SKDS.
CONCLUSION
The risk prediction index derived from machine learning for the MCI-SKDS prediction model is simple and practical; the model demonstrates good predictive value and clinical applicability, and the DT model had the best performance. Please cite this article as: Ai YT, Zhou S, Wang M, Zheng TY, Hu H, Wang YC, Li YC, Wang XT, Zhou PJ. Development of a machine learning-based risk prediction model for mild cognitive impairment with spleen-kidney deficiency syndrome in the elderly. J Integr Med. 2025; 23(4): 390-397.
Humans
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Cognitive Dysfunction/diagnosis*
;
Aged
;
Male
;
Female
;
Machine Learning
;
Spleen
;
Aged, 80 and over
;
Kidney
;
Medicine, Chinese Traditional
9.Clinical practice guidelines for the diagnosis and treatment of atopic dermatitis with integrative traditional Chinese and Western medicine.
Xin-Ran DU ; Meng-Yi WU ; Mao-Can TAO ; Ying LIN ; Chao-Ying GU ; Min-Feng WU ; Yi CAO ; Da-Can CHEN ; Wei LI ; Hong-Wei WANG ; Ying WANG ; Yi WANG ; Han-Zhi LU ; Xin LIU ; Xiang-Fei SU ; Fu-Lun LI
Journal of Integrative Medicine 2025;23(6):641-653
Traditional Chinese medicine (TCM) is a well-accepted therapy for atopic dermatitis (AD). However, there are currently no evidence-based guidelines integrating TCM and Western medicine for the treatment of AD, limiting the clinical application of such combined approaches. Therefore, the China Association of Chinese Medicine initiated the development of the current guideline, focusing on key issues related to the use of TCM in the treatment of AD. This guideline was developed in accordance with the principles of the guideline formulation manual published by the World Health Organization. A comprehensive review of the literature on the combined use of TCM and Western medicine to treat AD was conducted. The findings were extensively discussed by experts in dermatology and pharmacy with expertise in both TCM and Western medicine. This guideline comprises 23 recommendations across seven major areas, including TCM syndrome differentiation and classification of AD, principles and application scenarios of TCM combined with Western medicine for treating AD, outcome indicators for evaluating clinical efficacy of AD treatment, integration of TCM pattern classification and Western medicine across disease stages, daily management of AD, the use of internal TCM therapies and proprietary Chinese medicines, and TCM external treatments. Please cite this article as: Du XR, Wu MY, Tao MC, Lin Y, Gu CY, Wu MF, Cao Y, Chen DC, Li W, Wang HW, Wang Y, Wang Y, Lu HZ, Liu X, Su XF, Li FL. Clinical practice guidelines for the diagnosis and treatment of atopic dermatitis with integrative traditional Chinese and Western medicine. J Integr Med. 2025; 23(6):641-653.
Dermatitis, Atopic/drug therapy*
;
Humans
;
Medicine, Chinese Traditional/methods*
;
Integrative Medicine
;
Drugs, Chinese Herbal/therapeutic use*
;
Practice Guidelines as Topic
10.Laboratory Diagnosis and Molecular Epidemiological Characterization of the First Imported Case of Lassa Fever in China.
Yu Liang FENG ; Wei LI ; Ming Feng JIANG ; Hong Rong ZHONG ; Wei WU ; Lyu Bo TIAN ; Guo CHEN ; Zhen Hua CHEN ; Can LUO ; Rong Mei YUAN ; Xing Yu ZHOU ; Jian Dong LI ; Xiao Rong YANG ; Ming PAN
Biomedical and Environmental Sciences 2025;38(3):279-289
OBJECTIVE:
This study reports the first imported case of Lassa fever (LF) in China. Laboratory detection and molecular epidemiological analysis of the Lassa virus (LASV) from this case offer valuable insights for the prevention and control of LF.
METHODS:
Samples of cerebrospinal fluid (CSF), blood, urine, saliva, and environmental materials were collected from the patient and their close contacts for LASV nucleotide detection. Whole-genome sequencing was performed on positive samples to analyze the genetic characteristics of the virus.
RESULTS:
LASV was detected in the patient's CSF, blood, and urine, while all samples from close contacts and the environment tested negative. The virus belongs to the lineage IV strain and shares the highest homology with strains from Sierra Leone. The variability in the glycoprotein complex (GPC) among different strains ranged from 3.9% to 15.1%, higher than previously reported for the seven known lineages. Amino acid mutation analysis revealed multiple mutations within the GPC immunogenic epitopes, increasing strain diversity and potentially impacting immune response.
CONCLUSION
The case was confirmed through nucleotide detection, with no evidence of secondary transmission or viral spread. The LASV strain identified belongs to lineage IV, with broader GPC variability than previously reported. Mutations in the immune-related sites of GPC may affect immune responses, necessitating heightened vigilance regarding the virus.
Humans
;
China/epidemiology*
;
Genome, Viral
;
Lassa Fever/virology*
;
Lassa virus/classification*
;
Molecular Epidemiology
;
Phylogeny

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