1.Epidemiological analysis and incidence trend prediction of mumps in Nantong City in 2016 - 2023
Enhui ZHAO ; Ye WEI ; Hongmei JIN ; Wuhong ZHANG
Journal of Public Health and Preventive Medicine 2026;37(2):84-88
Objective To analyze the epidemiological characteristics and incidence trend of mumps in Nantong City from 2016 to 2023, and to provide a basis for scientific prevention and control. Methods Descriptive statistical analysis was conducted on monthly mumps incidence data in Nantong City from 2016 to 2023, and a SARIMA model was constructed to predict the incidence trend. Results A total of 3 928 mumps cases were reported in Nantong City from 2016 to 2023, with an average annual incidence rate of 6.36/100 000. Cases predominantly occurred during April–July and September–December, showing seasonal peaks. The male-to-female ratio was 1.43:1. The cases were concentrated in individuals aged ≤15 years (85.57%), primarily students, children in childcare settings, and scattered children (88.31%). The optimal model constructed by the SPSS Expert Modeler was SARIMA(1,0,0)(0,1,1)12, predicting an epidemic peak of mumps in Nantong City from September to November in the second half of 2024. Conclusion From 2016 to 2023, mumps incidence in Nantong City has shown an overall downward trend with a seasonal bimodal distribution. Males had higher incidence rates than females, and cases were predominantly students, kindergartens and scattered children, highlighting the need to strengthen mumps prevention in schools and childcare institutions. The SARIMA model is suitable for short to medium term prediction of mumps in Nantong City. A minor peak is predicted to occur in the second half of 2024 (September–November). It is necessary to strengthen the epidemic surveillance of mumps and vaccination of age-eligible children.
2.Retrospective study on bone defects of mandibular incisors in adult orthodontic patients
YANG Hongmei ; CHEN Xin ; LI Xingjian ; QIU Weizhuo ; CHEN Song
Journal of Prevention and Treatment for Stomatological Diseases 2026;34(4):367-377
Objective:
To explore the prevalence of bone defect and alveolar bone thickness changes in the mandibular incisors of untreated adults and post-orthodontic treatment adults, with the aim of providing strategies for preventing and managing alveolar bone defects during orthodontic treatment.
Methods:
This study was reviewed and approved by the Medical Ethics Committee. Clinical records, panoramic radiographs, cephalometric radiographs, and cone beam computed tomography (CBCT) images and informed consent were obtained for 150 untreated adults and 150 post-orthodontic adults. The untreated adults and post-orthodontic adults were respectively divided into three subgroups: skeletal ClassⅠ, Class Ⅱ and Class Ⅲ, with 50 cases per subgroup. Meanwhile, 60 cases with completeness of pre- and post-orthodontic data were enrolled from 150 post-orthodontic adults, including 20 cases each of skeletal ClassⅠ, Class Ⅱ, and Class Ⅲ. Cephalometric radiographs were imported into Dolphin software to measure skeletal parameters. CBCT images were imported into Mimics software to assess alveolar bone defects and to measure alveolar bone thickness of mandibular incisors among three groups: 150 untreated adult groups, 150 post-orthodontic groups and the pre- and post-treatment status of 60 patients selected from the latter group.
Results:
Untreated adult patients: the prevalence of labial dehiscence and fenestration in the mandibular incisors was higher than that on the lingual side among skeletal ClassⅠ, Ⅱ, and Ⅲ malocclusion patients, and there was a statistically significant difference in the alveolar bone thickness of the mandibular incisors among the three classes. Post-orthodontic treatment adults: for skeletal ClassⅠ and Ⅱ patients, the prevalence of lingual bone dehiscence in the mandibular incisors was significantly higher in the extraction groups than in the non-extraction groups; correspondingly, the lingual alveolar bone was also thinner in the extraction groups; Class Ⅱ non-extraction patients showed a higher prevalence of labial bone fenestration but a lower prevalence of lingual bone fenestration in mandibular incisors compared to Class Ⅱ extraction patients; the orthodontic-orthognathic combined treatment group showed significantly higher prevalence of labial/lingual bone dehiscence and thinner alveolar bone at multiple sites in the mandibular incisors compared to the camouflage group in skeletal Class Ⅲ patients. Comparison of mandibular incisor bone defects and thickness before and after orthodontic treatment in adult patients: in skeletal ClassⅠ and Ⅱ patients treated with premolar extraction and Class Ⅲ patients treated with orthodontic-orthognathic combined treatment, the lingual alveolar bone of mandibular incisors exhibited significant resorption and thinned after treatment, and this was accompanied by an increased prevalence of dehiscence; in non-extraction patients, ClassⅠ non-extraction patients showed thinning of the crestal-labial bone and apical-lingual bone, Class Ⅱ patients showed thinning of the crestal-labial bone and middle-labial bone of the mandibular incisors, along with an increased prevalence of dehiscence
Conclusion
In malocclusion adults, alveolar bone defects were already present in the mandibular incisors before orthodontic treatment. The alveolar bone defects and thickness in mandibular incisors among post-orthodontic adults were influenced by the treatment plan and Class of skeletal malocclusion.
3.Research progress on the relationship between brown adipose tissue and weight loss therapy
Jiaojiao LIU ; Zhitian ZHANG ; Yin CHEN ; Xijia HE ; Hongmei YAN ; Ruwen WANG
Chinese Journal of Clinical Medicine 2026;33(1):113-120
In recent years, the rising prevalence of obesity and its associated metabolic syndromes has emerged as a critical global public health concern. Sustained weight loss exceeding 10% of total body weight has been shown to ameliorate obesity-related comorbidities, including type 2 diabetes mellitus, hypertension, and hepatic steatosis. Recently, the potential of brown adipose tissue (BAT) to improve metabolism has garnered significant attention. However, evidence regarding weight loss therapies that promote BAT activation remains limited in preclinical models and is even scarcer in clinical studies, partly due to the paucity of appropriate BAT assessment techniques. This review aims to explore the potential impact of various weight loss therapies on BAT, with the goal of providing novel insights and strategies for the treatment of obesity.
4.Regulatory Effect and Mechanisms of Liuhuang Zhike Prescription on Glycemic Control in db/db Mice via AMPK/Akt/GSK-3β Signaling Pathway
Fangyuan DENG ; Ting WANG ; Qianli KANG ; Hongmei LIN
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(9):122-132
ObjectiveTo investigate the regulatory effects and underlying mechanisms of Liuhuang Zhike prescription (LHZK) on blood glucose in type 2 diabetic db/db mice based on the AMP-activated protein kinase/protein kinase B/glycogen synthase kinase-3β (AMPK/Akt/GSK-3β) signaling pathway. MethodsDb/db mice were used as the model animals, and db/m mice served as the blank control. Forty db/db mice were randomly divided into the model group, metformin group (0.14 g·kg-1), and low-, medium-, and high-dose (4.11, 8.21, 16.43 g·kg-1) LHZK groups, with 8 mice in each group. The db/db mice in the metformin and LHZK groups were administered the corresponding drugs by gavage, while the blank control and model groups were given distilled water by gavage once daily for 8 consecutive weeks. Food intake, water consumption, body weight, and fasting blood glucose (FBG) were measured weekly. An automatic biochemical analyzer was used to determine glycated serum protein (GSP), serum triglycerides (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), and low-density lipoprotein cholesterol (LDL-C) levels. Hematoxylin-eosin (HE) staining was used to observe pathological morphological changes in the liver and pancreatic tissues. Oil red O staining was used to assess lipid accumulation in liver tissue. The anthrone colorimetric method was used to determine hepatic glycogen content. Real-time quantitative PCR (Real-time PCR) was used to detect the mRNA expression levels of insulin receptor substrate-1 (IRS-1), Akt2, phosphoenolpyruvate carboxykinase (PEPCK), and glucose-6-phosphatase (G6Pase) in liver tissue. Western blot was used to detect the protein expression of AMPKα, phosphorylated AMPKα (p-AMPKα), GSK-3β, p-GSK-3β, glycogen synthase (GS), and phosphorylated GS (p-GS) in liver tissue. ResultsCompared with the blank control group, the model group showed significantly increased food intake, water consumption, body weight, FBG, and GSP levels (P<0.01). Pancreatic islets exhibited marked parenchymal cell hyperplasia and interstitial inflammatory cell infiltration. Liver tissue showed obvious steatosis, accompanied by a compensatory increase in hepatic glycogen content (P<0.01). Hepatic G6Pase mRNA expression was increased, while IRS-1 and Akt2 mRNA expression levels were significantly decreased (P<0.01). The p-AMPKα/AMPKα protein expression ratio showed a decreasing trend, whereas the p-GSK-3β/GSK-3β and p-GS/GS protein expression ratios were significantly increased (P<0.01). Compared with the model group, food intake and water consumption showed decreasing trends in all treatment groups. Food intake was significantly reduced in the low- and high-dose LHZK groups and in the metformin group (P<0.05, P<0.01), and water consumption was significantly reduced in the low-dose LHZK group and in the metformin group (P<0.05, P<0.01). No statistically significant differences in body weight were observed among the LHZK groups, whereas body weight in the metformin group was significantly increased (P<0.05, P<0.01). FBG showed a decreasing trend in all treatment groups, with significant decreases in the low-dose LHZK group and the metformin group (P<0.05, P<0.01). GSP levels were significantly reduced in the low-dose LHZK group and in the metformin group (P<0.05, P<0.01). Hepatic steatosis and pancreatic pathological injury were alleviated to varying degrees in all treatment groups. Hepatic glycogen content further increased in all treatment groups, with significant increases in the medium- and high-dose LHZK groups (P<0.05). Real-time PCR results showed that all treatment groups downregulated the mRNA expression of G6Pase and PEPCK in the liver tissues of db/db mice, with significant downregulation of PEPCK mRNA in the low-dose LHZK and metformin groups (P<0.01). Meanwhile, all treatment groups upregulated IRS-1 and Akt2 mRNA expression, with the most pronounced upregulation observed in the medium-dose LHZK group (P<0.01). The p-AMPKα/AMPKα protein expression ratio was significantly increased in the low- and medium-dose LHZK groups (P<0.01). The p-GSK-3β/GSK-3β protein expression ratio was significantly increased in all treatment groups (P<0.05, P<0.01), whereas the p-GS/GS protein expression ratio was significantly decreased in all treatment groups (P<0.01). ConclusionLHZK effectively reduces FBG and GSP levels in type 2 diabetic mice and improves hepatic steatosis and pancreatic islet pathological injury. Its hypoglycemic mechanism may be associated with regulation of the AMPK/Akt/GSK-3β signaling pathway and promotion of hepatic glycogen synthesis.
5.Research Advances in Endocrine Therapy for Hormone Receptor-Positive/HER2-Negative Early Breast Cancer
Wenqin HUANG ; Yalong YANG ; Xinhong WU ; LAMBERTINI MATTEO ; Hongmei ZHENG
Cancer Research on Prevention and Treatment 2026;53(3):169-175
Hormone receptor (HR)-positive/HER2-negative early breast cancer is the most common subtype of breast cancer, and endocrine therapy serves as the cornerstone of adjuvant treatment. In recent years, with the publication of key clinical trials such as SOFT, TEXT, and monarchE, and breakthroughs in novel agents studies like lidERA, the endocrine therapy strategy for HR-positive/HER2-negative early breast cancer has evolved toward increased precision and intensity. This article systematically reviews the latest advances in endocrine therapy, focusing on the consolidation of ovarian function suppression as a standard for high-risk premenopausal patients with updated follow-up evidence, the benefit-risk assessment of extended endocrine therapy, and the current application and interdrug differences of CDK4/6 inhibitors in the adjuvant setting. This manuscript also addresses existing challenges, including optimizing treatment-related quality of life and precisely identifying beneficiary populations, and briefly introduces the clinical trial progress of novel agents, such as oral selective estrogen receptor degraders. Furthermore, it outlines evidence-based strategies for ovarian protection during chemotherapy and fertility preservation for young patients. This review aims to provide clinicians with a comprehensive perspective, balancing the pursuit of maximal efficacy with patients′ long-term quality of life and individualized needs.
6.Effect of Changji'an Formula (肠激安方) on the miR-29b-3p/TRAF3/NF-κB/MLCK Axis in Colonic Tissues in Diarrhea-predominant Irritable Bowel Syndrome Model Rat with Liver Depression and Spleen Deficiency Syndrome
Yongfu WANG ; Wei KE ; Xiangyu XIE ; Hongmei TANG ; Liuze SI ; Yuna CHAI
Journal of Traditional Chinese Medicine 2026;67(4):439-446
ObjectiveTo explore the potential mechanism of Changji'an Formula (肠激安方) on intestinal permeability for rats with diarrhea-predominant irritable bowel syndrome (IBS-D) of liver depression and spleen deficiency syndrome by the microRNA-29b-3p (miR-29b-3p)/tumor necrosis factor receptor-associated factor 3 (TRAF3)/nuclear factor-κB (NF-κB)/myosin light chain kinase (MLCK) axis. MethodsTwenty-four 1-day-old male Sprague-Dawley (SD) suckling rats were selected, and the IBS-D rat model of liver depression and spleen deficiency syndrome was established via a three-factor method,i.e. maternal separation plus acetic acid stimulation and restraint stress, for 6 consecutive weeks. After successful modeling, the rats were randomly divided into a model group, pinaverium bromide group, low-dose and high-dose Changji'an Formula groups, with 6 rats in each group. Another 6 age-matched non-modeled SD rats were included as the control group. The low-dose and high-dose Changji'an Formula groups were given intragastric administration of Changji'an Formula solution at doses of 16.74 g/(kg·d) and 33.48 g/(kg·d), respectively; the pinaverium bromide group received intragastric administration of pinaverium bromide tablets at 0.018 g/(kg·d); and the control group was given distilled water at 10 ml/(kg·d) via intragastric gavage. The intervention was conducted once daily for 14 consecutive days. After the gavage treatment, the fecal water content of rats in each group was measured. Enzyme-linked immunosorbent assay (ELISA) was used to detect the serum levels of intestinal permeability indicators, including D-lactic acid (D-LA), diamine oxidase (DAO), and lipopolysaccharide (LPS). Quantitative real-time polymerase chain reaction (qRT-PCR) was conducted to determine the mRNA expression levels of miR-29b-3p, TRAF3, tumor necrosis factor-α (TNF-α), p65, p50, and MLCK in colonic tissues. Western Blot analysis was employed to detect the protein expression levels of TRAF3, TNF-α, p65, phosphorylated p65 (p-p65), MLCK, myosin light chain (MLC), phosphorylated MLC (p-MLC), and tight junction proteins including junctional adhesion molecule-A (JAM-A), Occludin, and Claudin-1 in colonic tissues. ResultsCompared with the control group, the model group exhibited significantly increased fecal water content and serum levels of D-LA, DAO, and LPS, along with decreased protein expression levels of JAM-A, Occludin, and Claudin-1 in colonic tissues (P<0.05 or P<0.01). Additionally, in the model group, the mRNA expression levels of miR-29b-3p, TNF-α, p65, p50, and MLCK in colonic tissues were up-regulated, while the mRNA and protein expression levels of TRAF3 were down-regulated; the protein levels of TNF-α and MLCK, as well as the ratios of p-p65/p65 and p-MLC/MLC, significantly elevated (P<0.01). Compared with the model group, all treatment groups showed reduced fecal water content and serum levels of D-LA, DAO, and LPS, along with down-regulated mRNA expression levels of miR-29b-3p, TNF-α, p65, p50, and MLCK, and up-regulated TRAF3 mRNA expression in colonic tissues. Moreover, the pinaverium bromide group and high-dose Changji'an Formula group presented increased protein levels of Occludin, Claudin-1, and TRAF3, as well as decreased protein levels of TNF-α and MLCK, and reduced ratios of p-p65/p65 and p-MLC/MLC in colonic tissues (P<0.05 or P<0.01). Compared with the low-dose Changji'an Formula group, the high-dose group had lower fecal water content and serum levels of DAO and LPS (P<0.01). In comparison with the pinaverium bromide group, the high-dose Changji'an Formula group showed a significant decrease in serum DAO level (P<0.01). ConclusionsChangji'an Formula can reduce intestinal permeability and restore intestinal barrier function in IBS-D rats of liver depression and spleen deficiency syndrome by regulating the miR-29b-3p/TRAF3/NF-κB/MLCK axis.
7.Mechanisms of Dihuang Yinzi in Treating Advanced Parkinson's Disease Based on Gut Microbiota-SCFAs-inflammation Axis
Renzhi MA ; Yasi LIN ; Tingyue JIANG ; Hongmei ZHU ; Jiayuan LI ; Yu WANG ; Ge ZHANG ; Wenxin FAN ; Jinli SHI
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(7):11-21
ObjectiveTo observe the effects of Dihuang Yinzi (DY) on motor dysfunction in rats with advanced Parkinson's disease (PD) and to investigate the mechanisms by which DY improves advanced PD symptoms through the "gut microbiota-short-chain fatty acids (SCFAs)-inflammation-neuroprotection pathway". MethodsAn advanced PD rat model was induced by rotenone. Rats were divided into a normal group, model group, positive drug group (levodopa, 50 mg·kg-1), and DY low-, medium-, and high-dose groups (5.2, 10.4, 20.8 g·kg-1). After 7 days of administration, motor function was evaluated using the open-field, pole-climbing, and inclined plate tests. Hematoxylin-eosin (HE) staining was used to observe pathological changes in the substantia nigra and colon, and immunohistochemistry was performed to detect α-Synuclein (α-Syn) and tyrosine hydroxylase (TH) expression in the substantia nigra. Enzyme-linked immunosorbent assay (ELISA) was used to measure levels of dopamine (DA), 5-hydroxytryptamine (5-HT), 3,4-dihydroxyphenylacetic acid (DOPAC), Levodopa, homovanillic acid (HVA), tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and interleukin-1β (IL-1β). Western blot analysis was used to detect the expression of zonula occludens-1 (ZO-1) and occludin. Gut microbiota diversity was analyzed by 16S rRNA sequencing, and gas chromatography (GC) was used to determine the content of SCFAs in colonic contents. ResultsCompared with the normal group, the model group showed significantly decreased movement speed and distance in the open-field test, prolonged pole-climbing time, and reduced retention angle on the inclined plate (P<0.01), accompanied by increased α-Syn expression (P<0.01) and decreased TH expression (P<0.01) in the brain. Compared with the model group, all DY dose groups improved motor dysfunction in advanced PD rats to varying degrees (P<0.05, P<0.01) and alleviated pathological damage in the brain and colon. High-dose DY significantly reduced α-Syn aggregation in the substantia nigra (P<0.01) and increased TH expression (P<0.01). ELISA and Western blot results showed that, compared with the normal group, the model group exhibited decreased levels of DA, 5-HT, DOPAC, Levodopa, and HVA in the striatum (P<0.01), increased levels of TNF-α, IL-6, and IL-1β in the colon and striatum (P<0.01), and significantly reduced expression of ZO-1 (P<0.05) and occludin in the colon (P<0.01). Compared with the model group, all DY dose groups increased the levels of DA, 5-HT, DOPAC, Levodopa, and HVA in the striatum to varying degrees (P<0.05, P<0.01). In the high-dose DY group, the levels of TNF-α, IL-6, and IL-1β in the colon and striatum were reduced (P<0.01), while the expression of ZO-1 (P<0.05) and occludin in the intestine was increased. The 16S rRNA sequencing results indicated that the relative abundances of Actinobacteriota, Enterobacteriaceae, and Erysipelotrichaceae were increased in the model group, whereas the relative abundances of Bacteroidota, class Clostridia, Lachnospiraceae, and Akkermansia muciniphila were decreased. These changes were effectively reversed after high-dose DY intervention. GC analysis showed that the content of SCFAs in the colonic contents of rats in the model group was decreased (P<0.05, P<0.01), while after high-dose DY intervention, the levels of acetate, propionate, isobutyrate, and butyrate were significantly increased (P<0.05, P<0.01). ConclusionDY may exert therapeutic effects in advanced PD by regulating the gut microbiota-SCFAs-inflammation pathway.
8.Research progress on the bidirectional association between periodontal disease and depression/anxiety
WANG Liwen ; CAI Yutai ; RUAN Yaru ; ZHANG Fan ; YU Hongmei ; GAO Yanhui
Journal of Prevention and Treatment for Stomatological Diseases 2026;34(3):281-291
There are practical and cost-effective opportunities for the prevention and early intervention of periodontal disease, a common oral condition. Depression and anxiety represent major global mental health challenges, and they are characterized by high prevalence rates and an elevated suicide risk. Their clinical management is complicated by extended treatment timelines and substantial healthcare costs. Accumulating evidence demonstrates a statistically significant bidirectional association between periodontal disease and depression/anxiety disorders. However, established clinical pathways integrating these conditions remain lacking. This review presents a comprehensive analysis of current research examining the relationship between periodontal disease and mood disorders, specifically depression and anxiety. This study explored the bidirectional mechanisms within the microbiota-oral-brain axis, which includes both periodontal disease inducing neuroinflammation through pro-inflammatory factors, such as interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) activating the TLR-4/NF-κB signaling pathway, and depression and anxiety leading to “glucocorticoid resistance” through hypothalamic-pituitary-adrenal (HPA) axis dysregulation, thus causing dual immune dysfunction that exacerbates periodontal tissue destruction, as well as the mechanisms by which biological, psychological, and social factors contribute to the bidirectional association between periodontal disease and depression/anxiety. We propose implementing bidirectional referral protocols between dental and psychiatric services in clinical practice, incorporating mental health screening tools, such as Patient Health Questionnaire-9 (PHQ-9) and Generalized Anxiety Disorder-7(GAD-7), for patients with moderate-to-severe periodontal disease, and incorporating periodontal examination into routine assessment during psychiatric services. This multidisciplinary approach aims to break the vicious circle between these conditions and provide clinicians with pragmatic intervention strategies.
9.Effect of fatty liver on cardiac structure and function: a cross-sectional study based on health examination
Peiwen CHEN ; Xingxing REN ; Hongmei YAN ; Xinxia CHANG ; Jing ZHANG ; Hailuan ZENG ; Jingjing JIANG
Chinese Journal of Clinical Medicine 2026;33(3):434-444
Objective To investigate the cross-sectional associations between different fatty liver classifications and cardiac structure and function in people undergo health examination. Methods A total of 6 545 adults who underwent health examinations at the Health Management Center of Zhongshan Hospital, Fudan University between January 1 and December 31, 2017, were retrospectively included. Demographic characteristics and laboratory data were collected. The hepatic steatosis was graded by ultrasonography. And patients with fatty liver were further stratified according to alanine aminotransferase (ALT) or aspartate aminotransferase (AST) levels, as well as the degree of liver fibrosis. Cardiac morphology and function were assessed by transthoracic echocardiography, and left ventricular geometric patterns were classified accordingly. Multivariate logistic regression analysis was performed to evaluate the associations between fatty liver classifications and cardiac abnormalities. Results There were 2 795 patients (42.7%) with fatty liver, of whom 832 (29.8%) had significant cardiac structural alterations and 1 500 (53.7%) had diastolic dysfunction. Severe fatty liver was risk factor for concentric remodeling and increased relative wall thickness (RWT), with odds ratios (ORs) of 1.27 (P=0.012) and 1.27 (P=0.009), respectively. Fatty liver accompanied by elevated ALT or AST was risk factor for concentric remodeling (OR=1.45,1.56; P=0.001, 0.001), increased RWT (OR=1.48,1.57; P<0.001, <0.001), and diastolic dysfunction (OR=1.27, 1.32; P=0.035, 0.040), respectively. Fatty liver with liver fibrosis was risk factor for concentric remodeling (OR=1.83, P=0.046) and diastolic dysfunction (OR=2.64, P=0.034). Conclusions Advanced fatty liver, including severe hepatic steatosis, accompanied by elevated liver enzymes or liver fibrosis, could increase risks of cardiac remodeling and diastolic dysfunction, while systolic function is preserved. For patients with fatty liver, it is recommended to undergo regular ultrasonography examination.
10.LSS deficiency ameliorates MASLD by downregulating NPC1L1 and activating the CD36/TLR4/JNK pathway
Zihan WANG ; Hongmei BAI ; Qingya HE ; Wenjing ZHOU ; Jian ZHONG ; Xiaoli JIANG ; Sumei ZHANG ; Shengquan ZHANG
Acta Universitatis Medicinalis Anhui 2026;61(5):812-818
ObjectiveTo investigate whether intestinal deficiency of lanosterol synthase (LSS), a key enzyme in cholesterol synthesis, influences the progression of metabolic dysfunction-associated steatotic liver disease (MASLD) by regulating intestinal cholesterol absorption and immune response. MethodsLSS heterozygous knockout (LSS+/-) mice and wild-type (WT) controls were generated using CRISPR/Cas9 technology and fed either a high-fat diet (HFD) or regular chow (CHOW). The model was validated by genotyping. Hepatic steatosis was assessed by HE and oil red O staining. Immunohistochemistry was used to detect the localization and expression of NPC1L1 and CD36 proteins in the intestine. Western blot analysis was performed to measure JNK phosphorylation and TLR4 protein levels in intestinal tissues. Real-time quantitative polymerase chain reaction (qPCR) was employed to examine the mRNA expression of TLR4 and IL-6. ResultsLSS+/- mice were successfully validated by genotyping and reduced intestinal LSS protein expression. HE and oil red O staining of liver sections showed that, compared with WT mice fed a CHOW diet, WT mice fed a HFD exhibited a marked increase in hepatic lipid vacuoles. In contrast, compared with HFD-fed WT mice, HFD-fed LSS+/- mice displayed significantly attenuated hepatic lipid deposition and reduced serum ALT levels (P<0.05). Immunohistochemical analysis revealed that, compared with WT mice, the expression of the cholesterol absorption protein NPC1L1 in the intestinal villi of LSS+/- mice was downregulated under both CHOW and HFD conditions (PHFD<0.001). Conversely, the expression of the fatty acid transporter CD36 was upregulated in the intestines of LSS+/- mice (PCHOW<0.05, PHFD<0.01). Western blot analysis demonstrated that, compared with WT mice, TLR4 protein expression in the intestines of LSS+/- mice significantly increased under both CHOW and HFD conditions (both P<0.05). JNK phosphorylation level was significantly elevated in LSS+/- mice under CHOW condition (both P<0.05). Under HFD condition, total JNK protein expression increased, but its phosphorylation level showed no significant change. qPCR analysis showed that, compared with WT mice, the mRNA levels of TLR4 (PCHOW<0.01, PHFD<0.000 1) and IL-6 (PCHOW<0.001, PHFD<0.01) were significantly upregulated in the intestines of LSS+/-mice. ConclusionLSS deficiency counteracts hepatic lipid deposition by orchestrating a synergistic reprogramming involving restricted intestinal cholesterol absorption, enhanced fatty acid utilization, and activation of immune pathways, suggesting intestinal LSS as a potential therapeutic target of MASLD.


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