1.Effect of Yang-Reinforcing and Blood-Activating Therapy on the Long-Term Prognosis for Dilated Cardio-myopathy Patients with Yang Deficiency and Blood Stasis Syndrome:A Retrospective Cohort Study
Shiyi TAO ; Jun LI ; Lintong YU ; Ji WU ; Yuqing TAN ; Xiao XIA ; Fuyuan ZHANG ; Tiantian XUE ; Xuanchun HUANG
Journal of Traditional Chinese Medicine 2026;67(1):53-59
ObjectiveTo evaluate the impact of yang-reinforcing and blood-activating therapy on the long-term prognosis for patients with dilated cardiomyopathy (DCM) of yang deficiency and blood stasis syndrome. MethodsA retrospective cohort study was conducted involving 371 DCM patients with yang deficiency and blood stasis syndrome. The yang-reinforcing and blood-activating therapy was defined as the exposure factor. Patients were categorized into exposure group (186 cases) and non-exposure group (185 cases) according to whether they received yang-reinforcing and blood-activating therapy combined with conventional western medicine for 6 months or longer. The follow-up period was set at 48 months, and the Kaplan-Meier survival analysis was used to assess the cumulative incidence of major adverse cardiovascular events (MACE) in both groups. Cox regression analysis was used to explore the impact of yang-reinforcing and blood-activating therapy on the risk of MACE, and subgroup analysis was performed. Changes in traditional Chinese medicine (TCM) syndrome score, left ventricular ejection fraction (LVEF), left ventricular fractional shortening (LVFS), left ventricular end-diastolic diameter (LVEDD), and Minnesota Living with Heart Failure Questionnaire (MLHFQ) score were compared between groups at the time of first combined use of yang-reinforcing and blood-activating therapy (before treatment) and 1 year after receiving the therapy (after treatment). ResultsMACE occurred in 31 cases (16.67%) in the exposure group and 47 cases (25.41%) in the non-exposure group. The cumulative incidence of MACE in the exposure group was significantly lower than that in the non-exposure group [HR=0.559, 95%CI(0.361,0.895), P=0.014]. Cox regression analysis showed that yang-reinforcing and blood-activating therapy was an independent factor for reducing the risk of MACE in DCM patients [HR=0.623, 95%CI(0.396,0.980), P=0.041], and consistent results were observed in different subgroups. Compared with pre-treatment, the exposure group showed decreased TCM syndrome score and MLHFQ score, reduced LVEDD, and increased LVEF and LVFS after treatment (P<0.05); in the non-exposure group, TCM syndrome score decreased, LVEF and LVFS increased, and LVEDD reduced after treatment (P<0.05). After treatment, the exposure group had higher LVEF and LVFS, smaller LVEDD, and lower TCM syndrome score and MLHFQ score compared with the non-exposure group (P<0.05). ConclusionCombining yang-reinforcing and blood-activating therapy with conventional western medicine can reduce the risk of MACE in DCM patients with yang deficiency and blood stasis syndrome, meanwhile improving their clinical symptoms, cardiac function, and quality of life.
2.Qualitative and Quantitative Analysis of Chemical Constituents in Gualou Niubangtang by UPLC-Q-TOF-MS/MS and HPLC
Yiyi ZHANG ; Jing YANG ; Yuqing CHENG ; Huimin GAO ; Jin QIN ; Li YAO ; Xiyang DU ; Raorao LI
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(6):179-187
ObjectiveThis paper aims to clarify the material basis of Gualou Niubangtang and establish a quantitative analysis method for its main constituents, providing a reference for the overall quality control of this preparation. MethodsThe constituents in the formula were systematically characterized based on ultra-performance liquid chromatography-quadrupole time-of-flight tandem mass spectrometry (UPLC-Q-TOF-MS/MS). Identification was performed by matching with the UNIFI 9.6 software and utilizing database platforms such as PubChem, ChemicalBook, and ChemSpider, combined with relevant literature reports. A quantitative analysis method for the seven main constituents in Gualou Niubangtang was established by using high performance liquid chromatography (HPLC). ResultsUPLC-Q-TOF-MS/MS analysis identified 155 constituents, including 69 flavonoids, 36 terpenoids, 23 phenylpropanoids, 8 phenylethanoid glycosides, and 19 other types of constituents. In the established quantitative analysis method, the seven main constituents showed good linearity within their respective linear ranges. The precision, repeatability, stability, and spike recovery all met the required standards. The results showed that the content ranges of geniposide, liquiritin, hesperidin, arctiin, baicalin, oroxylin A-7-O-β-D-glucuronide, and wogonoside in 15 batches of Gualou Niubangtang were 13.67-21.25, 1.20-7.64, 5.45-7.45, 22.97-33.51, 29.95-39.07, 2.58-4.80, and 6.56-9.31 mg·g-1, respectively. ConclusionThis study successfully characterizes and attributes multi-category constituents in Gualou Niubangtang, clarifying that its material basis is primarily composed of flavonoids, terpenoids, phenylethanoid glycosides, and phenylpropanoids. Furthermore, it enables the quantification of seven constituents within the formula. This work lays a foundation for research on the quality control, action mechanism, and clinical application of this formula.
3.Effect and Mechanisms of Luteolin on Gout
Jinlai CHENG ; Xiaoyu ZHANG ; Yuyan XU ; Huajing WANG ; Yuqing TAN ; Feng SUI ; Miyi YANG
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(1):140-149
ObjectiveTo integrate network pharmacology prediction with multi-level experimental verification methods, and to explore in depth the therapeutic efficacy and potential mechanism of luteolin in treating gout. MethodsDatabases were used to obtain potential pharmacodynamic targets of luteolin. Protein-protein interaction (PPI) network construction and network pharmacology analysis techniques were used to screen key core targets of luteolin in gout treatment. Further biological function enrichment analysis and signaling pathway analysis were performed on these targets. Molecular docking simulation was used to calculate the binding energy between luteolin and potential core targets, clarifying the strength of their interactions. In the in vivo experiment for hyperuricemia, 48 mice were randomly divided into a blank group, a model group, an allopurinol group (5 mg·kg-1), and low-dose (10 mg·kg-1), medium-dose (30 mg·kg-1), and high-dose (90 mg·kg-1) luteolin groups. For the first three days, the blank and model groups were gavaged with an equal volume of normal saline, while the allopurinol group and luteolin groups were gavaged with corresponding drugs. From day 4 onwards, modeling was performed by intraperitoneal injection at 12:00 daily (normal saline for the blank group, and oxonic acid potassium-hypoxanthine mixture for other groups, with 300 mg·kg-1 for each group). Gavage intervention was administered at 18:00 daily (normal saline for the blank/model groups, and corresponding drugs for the treatment groups) until day 7. After sampling, levels of serum uric acid (UA), alanine aminotransferase (ALT), and aspartate aminotransferase (AST) were measured. Levels of xanthine oxidase (XO) in the liver and kidney, ATP-binding cassette transporter G2 (ABCG2) and malondialdehyde (MDA) in the kidney, and superoxide dismutase (SOD) in the liver were determined. Renal HE staining was also performed. In the pharmacodynamic study of gouty arthritis, 36 rats were randomly divided into a blank group, a model group, a colchicine group (0.315 mg·kg-1), and low-dose (7 mg·kg-1), medium-dose (21 mg·kg-1), and high-dose (63 mg·kg-1) luteolin groups. The model was established by vertically injecting 100 µL of 25 g·L-1 monosodium urate suspension into the posterior lateral aspect of the right ankle joint (the blank group was injected with an equal volume of normal saline), with repeated injections every two days for reinforcement. From day 2 after modeling, daily gavage administration was performed (normal saline for the blank/model groups, and corresponding drugs for the treatment groups) for a total of 16 days. During the experiment, ankle swelling and pain threshold were measured regularly. After sampling, levels of serum tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and interleukin-1β (IL-1β) were determined. Ankle joints were subjected to HE, Masson, and safranin O-fast green staining, and HE staining was also performed on ankle synovial tissue and various organs. Western blot was used to determine the expression levels of key proteins in gout-related signaling pathways. ResultsNetwork pharmacology analysis predicted that luteolin may regulate over 20 core targets, such as XO, ABCG2, nuclear factor erythroid 2-related factor 2 (Nrf2), and SOD, through acting on signaling pathways including NF-κB, phosphoinositide 3-kinase/protein kinase B (PI3K/Akt), and ABC transporters, thereby affecting uric acid metabolism and inflammatory responses. In the hyperuricemia model, compared with the blank group, the model group showed significantly increased serum UA level, liver and kidney XO activity, renal ABCG2 expression, and liver SOD activity (P<0.01). Compared with the model group, the high-dose luteolin group significantly reduced serum UA level (P<0.01), inhibited liver and kidney XO activity (P<0.01), and significantly increased renal ABCG2 expression and liver SOD activity (P<0.01), effectively alleviating renal oxidative stress damage and improving renal histopathological status. In the gouty arthritis model, compared with the blank group, the model group showed significant ankle swelling, decreased pain threshold, and significantly increased levels of IL-6, IL-1β, and TNF-α in serum and synovial tissue (P<0.01). The high-dose luteolin group significantly reduced ankle swelling, prolonged hot plate pain threshold, effectively decreased the levels of the above inflammatory factors in serum and synovial tissue (P<0.01), and significantly improved ankle pathological damage, showing good analgesic and anti-inflammatory effects. Western blot results further confirmed that luteolin significantly upregulated Nrf2 protein expression and downregulated XO and nucleotide-binding oligomerization domain (NOD)-like receptor protein 3 (NLRP3) expression in animals. ConclusionLuteolin can improve symptoms of hyperuricemia and gouty arthritis, and its potential mechanism may be related to inhibiting XO activity, increasing ABCG2 and SOD levels, and regulating Nrf2-mediated oxidative stress-related pathways.
4.Analysis of risk factors for cardiovascular events and construction of a nomogram prediction model in patients undergoing long-term peritoneal dialysis
Xinyuan ZHOU ; Yuxin JIANG ; Xiaoxia WANG ; Xiangjie YANG ; Runzhe ZHOU ; Yuqing MENG ; Dingxin ZHANG ; Jin ZHANG ; Ying WANG
Acta Universitatis Medicinalis Anhui 2026;61(4):748-757
ObjectiveTo analyze the risk factors for long-term cardiovascular events in patients undergoing long-term peritoneal dialysis (PD), and to construct and validate a visual nomogram prediction model based on multiple parameters. MethodsA prospective cohort study was conducted, consecutively enrolling 248 maintenance PD patients (dialysis duration ≥ 3 months). Demographic characteristics, clinical indicators, laboratory parameters, and echocardiographic indices (including left ventricular ejection fraction [LVEF], ratio of early diastolic mitral inflow velocity to early diastolic mitral annular velocity (E/e’), etc.) were collected. The composite endpoint was defined as the occurrence of cardiovascular events or cardiovascular death, with non-cardiovascular death as the competing risk and loss to follow-up or the end of follow-up as censoring events. Fine-Gray competing risks model was used to screen independent predictors, based on which a nomogram model was constructed. Internal validation was performed using the Bootstrap method (1 000 resamplings), and the concordance index (C-index) and time-dependent receiver operating characteristic (time-dependent ROC) curve were calculated to evaluate the model performance. ResultsWith a median follow-up of 29 months (interquartile range: 24–35 months), 88 patients (35.48%) reached the composite endpoint, including 80 cases of cardiovascular events and 8 cases of cardiovascular death, and 4 patients died of non-cardiovascular causes. Multivariate Fine-Gray analysis revealed that age, diabetes mellitus, hemoglobin (HGB) level and E/e' ratio were independent influencing factors of the composite endpoint. Specifically, each 1-year increase in age was associated with a 3.0% increase in the risk of the composite endpoint (HR=1.030, P=0.006); patients with diabetes mellitus had a 167.9% higher risk compared with non-diabetic patients (HR=2.679, P=0.007); each 1g/L increase in HGB level contributed to a 1.5% reduction in the risk (HR=0.985, P=0.003); and each 0.1 increase in E/e' ratio led to a 7.2% increase in the risk (HR=1.072, P=0.045). The nomogram model had a C-index of 0.76 (95% CI: 0.698–0.820), and the AUC of the time-dependent ROC curve reached 0.849 at 23 months of follow-up. ConclusionIncreased age, complicated with diabetes mellitus, decreased HGB, and elevated E/e' ratio are independent risk factors of long-term occurrence of cardiovascular events and cardiovascular death in patients undergoing long-term PD. The nomogram model constructed based on the above variables has good predictive value and clinical applicability, which can provide a reference for cardiovascular risk stratification and individualized intervention in long-term PD patients.
5.Expert Consensus on Treatment of Simple Obesity in Children with Chinese Herbal Medicine
; Yingke LIU ; Xinxin REN ; Tiefeng ZHANG ; Yuqing LIU ; Junhong WANG ; Juan YU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(17):175-183
Childhood obesity is a chronic nutritional disorder caused by multiple factors that result in excessive total body fat and/or increased local fat content and abnormal fat distribution,sometimes accompanied by complications such as metabolic syndrome. The obesity caused by other factors excluding the secondary factors like genetics or metabolism is referred to as simple obesity. The incidence of childhood obesity in China is showing a trend toward younger ages and rapid growth,posing a serious threat to people's health and creating a heavy economic burden. Therefore,it is urgent to control and effectively intervene in childhood obesity. Traditional Chinese herbal medicine has long been a representative of internal treatment and shows effectiveness and advantages in the clinical treatment of childhood obesity. However,there is currently a lack of a comprehensive set of diagnostic and treatment standards,as well as evidence-based clinical practice. In order to improve clinical physicians' understanding of this disease and to promote the standardization and rationalization of herbal treatment,experts in clinical Chinese and Western medicine,nutrition,and methodology from across China were invited. On the basis of expert experience and current evidence,the Grading of Recommendations Assessment,Development,and Evaluation (GRADE) method was used to grade the evidence and recommendations. After two rounds of Delphi expert consultations,the guideline secretariat revised and refined the materials based on expert opinions. Ultimately,14 entries of expert consensus and recommendations were formulated,highlighting the advantages and characteristics of herbal treatment for childhood obesity,clarifying syndrome differentiation,medication,treatment cycles,and combination therapy plans for common clinical syndromes,thereby providing more treatment ideas in clinical practice and better leveraging therapeutic advantages.
6.Clinical Efficacy of Juanbitang Hot Compress Pack Combined with Intensive Rehabilitation Training in Ameliorating Hemiplegia After Stroke
Yuqin SHENG ; Yong YU ; Yan ZHANG ; Yuqing XIE ; Qing LIN ; Qian HU ; Longyu ZHANG ; Hongmei XU ; Xiaohong FAN ; Shouliang MA
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(17):210-218
ObjectiveTo explore the clinical efficacy of Juanbitang hot compress pack combined with intensive rehabilitation training in stroke patients with hemiplegia. MethodsA total of 80 stroke patients with hemiplegia were selected and assigned into a control group (40 cases) and an observation group (40 cases) according to the random number table method. The control group received conventional rehabilitation training and nursing intervention,while the observation group was additionally treated with Juanbitang hot compress pack. The two groups were compared in terms of the neurological function (national institute of health stroke scale score,NIHSS score),muscle strength,motor function (fugl-meyer assessment scale score,FMA score),daily living activity (modified barthel index,MBI),balance ability (berg balance scale score,BBS score),trunk control ability (Sheikh Trunk Control Test score,Sheikh TCT score),and homocysteine (Hcy) level before and after treatment. ResultsAfter treatment,the observation group had lower NIHSS score and Hcy level than the control group (P<0.05). The total response rate of the observation group (97.50%) was higher than that of the control group (77.50%). The scores of upper limb and lower limb FMA,MBI,BBS,and Sheikh TCT in the observation group were all higher than those in the control group (P<0.05). ConclusionThe application of Juanbitang hot compress pack combined with rehabilitation training can effectively improve the neurological function,muscle strength,motor function,daily living ability,balance ability,and trunk control ability and reduce the Hcy level in stroke patients with hemiplegia,demonstrating enhanced clinical efficacy.
7.Assessment of myocardial reserve using dobutamine stress echocardiography in valvular heart diseases with reduced ejection fraction and its implications for surgical strategy
Yuqing JIAO ; Haibo ZHANG ; Tiange LUO ; Chun ZHANG ; Jie HAN ; Yichen ZHAO ; Jiangang WANG
Chinese Journal of Clinical Thoracic and Cardiovascular Surgery 2026;33(08):1258-1266
Objective To elucidate the application scope and delineate the criteria of dobutamine stress echocardiography (DSE) in assessing surgical risk associated with valvular heart diseases in patients presenting with reduced left ventricular ejection fraction (LVEF). Methods This retrospective analysis encompassed data from patients with reduced LVEF (LVEF<40%) who underwent DSE prior to valvular heart surgery at the Valvular Surgery Center of Beijing Anzhen Hospital between May 2016 and September 2024. Patients were stratified based on the terminal dose of dobutamine into two cohorts: a limited dose group [receiving a maximum dobutamine dose of <5 µg/(kg·min) due to concomitant conditions such as suspected atrial thrombus, aortic dilation, or previous myocardial infarction] and a non-limited dose group (where dosage was adjusted to either achieve the maximum positive standard or the maximal dose tolerable by the patient). Within the non-limited dose group, patients were further classified into positive and negative response groups. The positive response post DSE was defined based on the following criteria: LVEF≥55% (the maximum positive standard), LVEF<55% but with a 5% improvement (the minimum positive standard) from resting situation, aortic maximum velocity (AVmax)≥400 cm/s, or mean pressure gradient (meanPG)≥40 mm Hg, latter two applicable only to patients with aortic stenosis. Clinical indicators were compared in the three groups. Results A total of 99 patients were enrolled, aged 35 to 87 years, with an average age of (61.7±10.1) years. The number of males was significantly higher than that of females (3:1). There were 61 (61.6%) patients undergoing aortic valve surgery, 25 (25.3%) undergoing mitral valve surgery, and 13 (13.1%) undergoing combined aortic and mitral valve surgery. Nineteen (19.2%) patients experienced adverse symptoms such as palpitations, head and face numbness, dizziness, chest tightness post DSE. Additionally, new-onset or aggravated ventricular premature ventricular contractions were in 40 (40.4%) patients. All above symptoms and signs resolved minutes after cessation of the test. No severe adverse events necessitating oxygen therapy or emergency intervention occurred. Among the 93 patients in the non-limited dose group, 86 were classified in the positive response group and 7 in the negative response group. The left ventricular end diastolic diameter, left ventricular end systolic diameter, and LVEF in the positive group all showed significant improvement compared to preoperative values, and were also significantly better than those in the negative group (P<0.05). All 7 patients with negative DSE results underwent interventional surgery, which was significantly different from the positive group (36 patients, 41.9%). In the limited dose group (n=6), 4 patients with a positive result or a positive trend on DSE underwent median sternotomy, 2 received interventional treatment due to a negative response. No significant differences in mortality were observed among the groups (P>0.05). Conclusion Dobutamine stress echocardiography significantly contributes to risk stratification in surgical interventions for patients with valvular heart disease complicated by reduced LVEF. It aids in determining optimal timing and methods for surgery. With comprehensive patient evaluation and controlled dobutamine dosing, the application of DSE can be safely expanded.
8.Investigation on the current status of pharmaceutical care in medical institutions in China
Tingting ZHENG ; Yuqing ZHANG ; Sitong LIU ; Wei ZHANG ; Jin LU ; Qunhong SHEN ; Jiancun ZHEN
China Pharmacy 2025;36(9):1117-1122
OBJECTIVE To investigate the current status of pharmaceutical care in medical institutions in China, and provide experience and suggestions for better development of pharmaceutical care. METHODS Questionnaire survey was used to investigate the development of pharmaceutical care in medical institutions in 31 provinces (autonomous regions and municipalities directly) in March 2023, and descriptive analysis and binary logistic regression analysis on the influencing factors of pharmaceutical care were conducted. RESULTS A total of 1 368 questionnaires were sent out, and 1 304 valid questionnaires were collected with the effective recovery rate of 95.32%. Pharmaceutical care was carried out in 671 medical institutions (51.46%), and the rates of pharmaceutical care in tertiary, secondary, primary and other medical institutions were 74.79%, 27.97% and 7.35%, respectively. The average number of patients receiving pharmaceutical care was 2 638.96 per year, and there were 8.33 pharmacists in each medical institution to carry out pharmaceutical care, among which 93.68% were clinical pharmacists. The main departments covered by pharmaceutical care services included respiratory and critical care medicine, cardiology, intensive care unit, endocrinology, oncology, gastroenterology, obstetrics and gynecology and other departments. There were only 48 medical institutions (7.15%) with additional compensation for pharmaceutical care services. The main experiences of developing pharmaceutical care were to pay attention to talent cultivation and discipline construction, but the main difficulties were serious shortage of staff and qualified talents, low compensation level and low enthusiasm. Grade of medical institutions, the number of pharmacists engaged in clinical pharmacy, the number of qualified clinical pharmacists and the degree of information in the pharmacy department were the main influencing factors for carrying out pharmaceutical care (P<0.05). CONCLUSIONS In recent years, pharmaceutical care in Chinese medical institutions has made certain progress, while that of primary medical institutions, secondary medical institutions and other medical institutions should be improved. In the future, it is still necessary to further enhance the implementation of pharmaceutical care, promote personnel training, and attach importance to demonstrating the value of pharmaceutical care, thereby promoting the sustainable and high- quality development of pharmaceutical care.
9.High-efficient discovering the potent anti-Notum agents from herbal medicines for combating glucocorticoid-induced osteoporosis.
Yuqing SONG ; Feng ZHANG ; Jia GUO ; Yufan FAN ; Hairong ZENG ; Mengru SUN ; Jun QIAN ; Shenglan QI ; Zihan CHEN ; Xudong JIN ; Yunqing SONG ; Tian TIAN ; Zhi QIAN ; Yao SUN ; Zhenhao TIAN ; Baoqing YU ; Guangbo GE
Acta Pharmaceutica Sinica B 2025;15(8):4174-4192
Notum, a negative feedback regulator of the Wnt signaling, has emerged as a promising target for treating glucocorticoid-induced osteoporosis (GIOP). This study showcases an efficient strategy for discovering the anti-Notum constituents from herbal medicines (HMs) as novel anti-GIOP agents. Firstly, a rapid-responding near-infrared fluorogenic substrate for Notum was rationally engineered for high-throughput identifying the anti-Notum HMs. The results showed that Bu-Gu-Zhi (BGZ), a known anti-osteoporosis herb, potently inhibited Notum in a competitive-inhibition manner. To uncover the key anti-Notum constituents in BGZ, an efficient strategy was adapted via integrating biochemical, phytochemical, computational, and pharmacological assays. Among all identified BGZ constituents, three furanocoumarins were validated as strong Notum inhibitors, while 5-methoxypsoralen (5-MP) showed the most potent anti-Notum activity and favorable safety profiles. Mechanistically, 5-MP acted as a competitive inhibitor of Notum via creating strong hydrophobic interactions with Trp128 and Phe268 in the catalytic cavity of Notum. Cellular assays showed that 5-MP remarkably promoted osteoblast differentiation and activated Wnt signaling in dexamethasone (DXMS)-challenged MC3T3-E1 osteoblasts. In dexamethasone-induced osteoporotic mice, 5-MP strongly elevated bone mineral density (BMD) and improved cancellous and cortical bone thickness. Collectively, this study constructs a high-efficient platform for discovering key anti-Notum constituents from HMs, while 5-MP emerges as a promising anti-GIOP agent.
10.Evidence that metformin promotes fibrosis resolution via activating alveolar epithelial stem cells and FGFR2b signaling.
Yuqing LV ; Yanxia ZHANG ; Xueli GUO ; Baiqi HE ; Haibo XU ; Ming XU ; Lihui ZOU ; Handeng LYU ; Jin WU ; Pingping ZENG ; Saverio BELLUSCI ; Xuru JIN ; Chengshui CHEN ; Young-Chang CHO ; Xiaokun LI ; Jin-San ZHANG
Acta Pharmaceutica Sinica B 2025;15(9):4711-4729
Idiopathic pulmonary fibrosis (IPF) is a progressive disease lacking effective therapy. Metformin, an antidiabetic medication, has shown promising therapeutic properties in preclinical fibrosis models; however, its precise cellular targets and associated mechanisms in fibrosis resolution remain incompletely defined. Most research on metformin's effects has focused on mesenchymal and inflammatory responses with limited attention to epithelial cells. In this study, we utilized Sftpc lineage-traced and Fgfr2b conditional knockout mice, along with BMP2/PPARγ and AMPK inhibitors, to explore metformin's impact on alveolar epithelial cells in a bleomycin-induced pulmonary fibrosis model and cell culture. We found that metformin increased the proliferation and differentiation of alveolar type 2 (AT2) cells, particularly the recently identified injury-activated alveolar progenitors (IAAPs)-a subpopulation characterized by low SFTPC expression but enriched for PD-L1. Single-cell RNA sequencing revealed a reduction in apoptosis among mature AT2 cells. Interestingly, metformin's therapeutic effects were not significantly affected by BMP2 or PPARγ inhibition, which blocked the lipogenic differentiation of myofibroblasts. However, Fgfr2b deletion in Sftpc lineage cells significantly impaired metformin's ability to promote fibrosis resolution, a process linked to AMPK signaling. In conclusion, metformin alleviates fibrosis by directly activating AT2 cells, especially the IAAPs, through a mechanism that involves AMPK and FGFR2b signaling, but is largely independent of BMP2/PPARγ pathways.

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