Objective:To investigate the pathological characteristics of post-cholecystectomy specimens from patients with benign gallbladder diseases.Methods:This retrospective case series study analyzed clinical and pathological data from 1 712 patients who underwent cholecystectomy for benign gallbladder diseases at the Sixth People′s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine between September 2022 and August 2024. The cohort included 757 males and 955 females, with an age ( M(IQR)) of 57(23) years (range: 14 to 91 years). Clinical and pathological features were analyzed. The χ2 test was used to compare clinical characteristics between patients with neoplastic and non-neoplastic polyps. Factors statistically significant in the χ2 test were subsequently included in a binary logistic regression analysis. Results:Postoperative pathological examination revealed gallbladder cancer in 7 patients (0.41%). These 7 cases, including 2 with pT3 stage cancer, were not detected preoperatively by various imaging examinations (ultrasound+magnetic resonance cholangiopancreatography/MRI plain scan in 3 cases, ultrasound+enhanced MRI in 1 case, ultrasound+enhanced CT in 2 cases, enhanced CT+enhanced MRI in 1 case). Gallbladder adenoma was found in 23 cases (1.34%), neoplastic polyps (including cholesterol polyps with dysplasia) in 29 cases (1.69%), and non-neoplastic polyps in 154 cases (9.00%). Statistically significant differences were observed in age and polyp number between patients with neoplastic and non-neoplastic polyps ( χ2=10.436 and 8.030; both P<0.05). Binary logistic regression analysis identified age ≥60 years ( P=0.003) and solitary polyps ( P=0.009) as risk factors for neoplastic polyps. Mucosal dysplasia was present in 164 cases (9.58%), including 9 cases of severe dysplasia, 4 of which exhibited focal carcinomatous transformation. Gallbladder polyps combined with stones were found in 90 cases (5.26%), among which 10 were associated with adenoma and mucosal dysplasia, and 2 showed focal carcinomatous transformation. Conclusions:The incidence of incidental gallbladder carcinoma was 0.41%. Intraoperative bile spillage can severely compromise prognosis. Preoperative imaging demonstrates a low detection rate for neoplastic polyps. Particular vigilance for neoplastic polyps is warranted in patients aged ≥60 years or with solitary polyps. Cholecystectomy should be performed promptly for benign gallbladder diseases meeting surgical indications.

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.

Ulcerative colitis （UC） is a common digestive disease characterized by recurrence and remission alternation，which seriously affects the life quality and physical and mental health of patients. The pathogenesis of UC is complex，and studies have shown that the occurrence and development of UC are closely related to the transduction of multiple signaling pathways. The current western medicine treatment has many problems，such as single action target，more adverse reactions，poor patient tolerance，and easy recurrence after stopping the medicine. Traditional Chinese medicine has the advantages such as multi-targets，multi-pathways， and fewer adverse reactions， elucidating that the action mechanism of traditional Chinese medicine in the treatment of UC is the focus of current research. Therefore， this paper conducted a systematic review on how traditional Chinese medicine exerts therapeutic effects by regulating the signaling pathways related to UC in recent years，and it was found that traditional Chinese medicine can regulate nuclear factor-κB （NF-κB），adenylate-activated protein kinase （AMPK）/mammalian target of rapamycin （mTOR），Janus tyrosine protein kinase （JAK）/signal transducer and activator of transcription （STAT），phosphatidylinositol 3-kinase （PI3K） /protein kinase B （Akt），NOD-like receptor thermoprotein structural domain-related protein 3 （NLRP3）/cysteine protease-1 （Caspase-1），nuclear respiratory factor 2 （Nrf2）/heme oxygenase-1 （HO-1）， and several other pathways，thereby inhibiting oxidative stress and cellular pyroptosis，regulating the Tregs/Th17 cellular balance， promoting autophagic response and M2-type macrophage polarization，restoring the diversity and abundance of intestinal flora，promoting the repair of intestinal mucosal barrier function，and alleviating the inflammatory damage of UC colonic tissues. The holistic concept and evidence-based treatment of traditional Chinese medicine were combined with the modern molecular mechanism research of traditional Chinese medicine， and the traditional Chinese medicine combinations with different mechanisms， following regulation， were formulated into compound formulas or pairs of medicines according to the pattern of evidence. It is expected to achieve better therapeutic efficacy and to provide ideas and references for the modification of classic compound formulae of traditional Chinese medicine in UC treatment and clinical translation.

Objective To compare the clinical characteristics of pneumococcal meningitis in different age groups, and to provide a basis for early diagnosis of pneumococcal meningitis. Methods Cerebrospinal fluid and/or serum samples were collected from 1742 suspected cases of meningitis in Baoji, Shaanxi Province from August 2013 to July 2019. Streptococcus pneumoniae was detected by isolation culture and real-time fluorescence quantitative polymerase chain reaction. Retrospective analysis of clinical manifestations, biochemical indicators and other information of laboratory confirmed cases was conducted by χ² test or Fisher's exact test. Results A total of 1742 samples of encephalitis or meningitis cases were detected, and 41 cases were confirmed as laboratory-confirmed Streptococcus pneumoniae infection. Among them, there were 12 cases (29.27%) in the infant group, 14 cases (34.15%) in the child group, and 15 cases (36.59%) in the adult group. The proportion of the adults with headache was significantly higher than that of the infants (χ²=11.408，P＜0.017). The proportion of the adults with consciousness disorder, elevated white blood cells and elevated neutrophils were significantly higher than those in the infant and the child groups（Fisher's exact test, P＜0.017；χ² =6.428，P＜0.017；χ² =10.898，P＜0.017；χ² =6.421，P＜0.017；χ² =9.758，P＜0.017；χ² =7.744，P＜0.017). The proportion of the infants with cerebrospinal fluid turbidity was significantly higher than that of the children (Fisher's exact test，P＜0.017). The proportion of the infants with decreased white blood cells and reduced glucose in cerebrospinal fluid was significantly higher than that of the children group and the adult group（Fisher's exact test, P＜0.001；Fisher's exact test, P＜0.001；Fisher's exact test, P＜0.017; Fisher's exact test, P＜0.017). Conclusion Most adult patients with pneumococcal meningitis have headache and consciousness disorders, with significantly increased proportion of white blood cells and neutrophils. Infant patients tend to have cloudy appearance of cerebrospinal fluid, leukopenia in blood, and decreased glucose in cerebrospinal fluid.

Background As common public facilities essential to daily life, hair and beauty salons frequently contain various airborne toxic and hazardous pollutants potentially leading to adverse health effects for salon practitioners. Objective To characterize the indoor air pollution profiles of common contaminants in hair and beauty salons in Shanghai and to evaluate the associated health risks for practitioners, in order to provide a scientific basis for strengthening the public health management in Shanghai and protecting the health of practitioners. Methods The air quality monitoring data of hair and beauty salons in Shanghai from 2016 to 2024 were obtained from the “Health Hazard Factors Monitoring Program for Public Places” of the National Institute of Environmental Health, Chinese Center for Disease Control and Prevention. Monitoring indicators included particulate matter ≤10 μm in aerodynamic diameter (PM₁₀), particulate matter ≤2.5 μm in aerodynamic diameter (PM_2.5), formaldehyde, ammonia, benzene, toluene, and xylene. Indicator compliance rates were calculated across various years in accordance with GB 9666-1996 Hygienic standard for barber shop and beauty shop and GB 37488-2019 Hygiene indicators and limit for public places; specifically, PM_2.5 was assessed against the limits stipulated in GB/T 18883-2022 Standards for indoor air quality. A questionnaire survey was conducted among salon practitioners to collect weekly working days and daily working hours. The non-carcinogenic risks associated with inhalation exposure to formaldehyde, ammonia, benzene, toluene, and xylene as well as the carcinogenic risks posed by formaldehyde and benzene were evaluated following WS/T 777-2021 Technical guide for environmental health risk assessment of chemical exposure and the U.S. Environmental Protection Agency inhalation risk model. Results The overall compliance rates of PM₁₀, formaldehyde, ammonia, benzene, and toluene in the air of hair and beauty salons in Shanghai from 2016 to 2024 were 92.13%, 96.59%, 96.15%, 94.93%, and 94.97%, respectively; the overall compliance rate of xylene was a little lower (85.92%), and the overall compliance rate of PM_2.5 was 57.18%. The P₅₀ concentrations of PM₁₀, PM_2.5, formaldehyde, ammonia, benzene, toluene, and xylene did not exceed the corresponding limits. The P₅₀ of non-carcinogenic risk indicator (hazard quotient, HQ) for formaldehyde, ammonia, benzene, toluene, and xylene were <1. The probabilities of non-carcinogenic risk HQ >1 for formaldehyde and xylene were 41.4% and 10.9%, respectively, which were higher than that of other pollutants. The P₅₀ of carcinogenic risk (CR) for formaldehyde and benzene were between 1.0×10⁻⁶ and 1.0×10⁻⁴, while the probabilities of CR >1.0×10⁻⁴ were 16.9% and 14.0%, respectively. Conclusion The overall compliance rate of common pollutant concentrations in the air of hair and beauty salons in Shanghai is high, and the hygienic condition meets the requirements of national standards. The non-carcinogenic health risks posed by formaldehyde and xylene to employees (with formaldehyde being more prominent), as well as the carcinogenic risks associated with formaldehyde and benzene, deserve heightened attention in future health supervision.

ObjectiveTo investigate the clinical effect of Ershen Zhenwu Decoction on chronic heart failure （CHF） due to heart-kidney Yang deficiency and blood stasis and its regulatory effects on miR-423-5p/Smad7/transforming growth factor-β₁ （TGF-β₁）/Smads axis and myocardial fibrosis indicators. MethodsOne hundred and fourteen patients with heart failure with reduced ejection fraction （HFrEF） and heart failure with mildly reduced ejection fraction （HFmrEF） were randomly allocated into a control group and an observation group. The control group was treated with dapagliflozin tablets， sacubitril-valsartan sodium tablets， metoprolol succinate， and spironolactone， and the observation group was treated with Ershen Zhenwu Decoction on the basis of the therapy in the control group. The course of treatment was 8 weeks in both groups. The 6-min walking distance， New York Heart Association （NYHA） heart function grade， Minnesota Living with Heart Failure Questionnaire （MLHFQ） score， N-terminal pro-B-type natriuretic peptide （NT-proBNP）， angiotensin Ⅱ （Ang Ⅱ）， left ventricular ejection fraction （LVEF）， left ventricular end-diastolic diameter （LVIDd）， left ventricular end-systolic diameter （LVIDs）， interventricular septum thickness at diastole （IVSd）， left ventricular end-diastolic posterior wall thickness （LVPWd）， left ventricular shortening fraction （FS）， miR-423-5p， Smad7， Smad2， Smad3， Smad4， TGF-β₁， Ang Ⅱ， type Ⅰ collagen （Col Ⅰ）， type Ⅲ collagen （Col Ⅲ）， mRNA levels of fibronectin （Fn） and α-smooth muscle actin （α-SMA） in the myocardial tissue were observed before and after treatment in both groups to evaluate the efficacy of cardiac function and drug safety. ResultsAfter treatment， both groups showed declined levels of NT-proBNP， Ang Ⅱ， miR-423-5p， Smad2， Smad3， Smad4， TGF-β₁， Col Ⅰ， Col Ⅲ， and mRNA levels of Fn and α-SMA （P0.05）， and the levels of the indicators above were lower in the observation group than in the control group （P0.05）. After treatment， the Smad7 level increased obviously in both groups （P0.05） and was higher in the observation group than in the control group （P0.05）. After treatment， both groups showed decreased MLHFQ scores and increased 6-min walking distance （P0.05）， and the observation group had lower MLHFQ score and longer 6-min walking distance than the control group （P0.05）. After treatment， the control group showed increased LVEF and FS （P0.05） and the observation group showcased decreased LVIDd and LVIDs and increased LVEF and FS （P0.05）. Moreover， the observation group had lower LVIDd and LVIDs （P0.05） and higher LVEF and FS （P0.05） than the control group. The total response rate of cardiac function in the observation group was 90.38% （47/52）， which was higher than that （70.59%， 36/51） in the control group （P0.05）. No adverse reactions associated with Ershen Zhenwu Decoction were observed during the study period. ConclusionErshen Zhenwu Decoction can improve the cardiac function， exercise tolerance， and quality of life， regulate neuroendocrine factors， and slow down/reverse myocardial remodeling in the patients with HFrEF and HFmrEF （syndrome of heart-kidney Yang deficiency and blood stasis by regulating the miR-423-5p/Smad7/TGF-β₁/Smads axis， inhibiting α-SMA and Fn expression， and alleviating myocardial fibrosis. It is worthy of further study.

ObjectiveTo investigate the clinical effect of Ershen Zhenwu Decoction on chronic heart failure （CHF） due to heart-kidney Yang deficiency and blood stasis and its regulatory effects on miR-423-5p/Smad7/transforming growth factor-β₁ （TGF-β₁）/Smads axis and myocardial fibrosis indicators. MethodsOne hundred and fourteen patients with heart failure with reduced ejection fraction （HFrEF） and heart failure with mildly reduced ejection fraction （HFmrEF） were randomly allocated into a control group and an observation group. The control group was treated with dapagliflozin tablets， sacubitril-valsartan sodium tablets， metoprolol succinate， and spironolactone， and the observation group was treated with Ershen Zhenwu Decoction on the basis of the therapy in the control group. The course of treatment was 8 weeks in both groups. The 6-min walking distance， New York Heart Association （NYHA） heart function grade， Minnesota Living with Heart Failure Questionnaire （MLHFQ） score， N-terminal pro-B-type natriuretic peptide （NT-proBNP）， angiotensin Ⅱ （Ang Ⅱ）， left ventricular ejection fraction （LVEF）， left ventricular end-diastolic diameter （LVIDd）， left ventricular end-systolic diameter （LVIDs）， interventricular septum thickness at diastole （IVSd）， left ventricular end-diastolic posterior wall thickness （LVPWd）， left ventricular shortening fraction （FS）， miR-423-5p， Smad7， Smad2， Smad3， Smad4， TGF-β₁， Ang Ⅱ， type Ⅰ collagen （Col Ⅰ）， type Ⅲ collagen （Col Ⅲ）， mRNA levels of fibronectin （Fn） and α-smooth muscle actin （α-SMA） in the myocardial tissue were observed before and after treatment in both groups to evaluate the efficacy of cardiac function and drug safety. ResultsAfter treatment， both groups showed declined levels of NT-proBNP， Ang Ⅱ， miR-423-5p， Smad2， Smad3， Smad4， TGF-β₁， Col Ⅰ， Col Ⅲ， and mRNA levels of Fn and α-SMA （P0.05）， and the levels of the indicators above were lower in the observation group than in the control group （P0.05）. After treatment， the Smad7 level increased obviously in both groups （P0.05） and was higher in the observation group than in the control group （P0.05）. After treatment， both groups showed decreased MLHFQ scores and increased 6-min walking distance （P0.05）， and the observation group had lower MLHFQ score and longer 6-min walking distance than the control group （P0.05）. After treatment， the control group showed increased LVEF and FS （P0.05） and the observation group showcased decreased LVIDd and LVIDs and increased LVEF and FS （P0.05）. Moreover， the observation group had lower LVIDd and LVIDs （P0.05） and higher LVEF and FS （P0.05） than the control group. The total response rate of cardiac function in the observation group was 90.38% （47/52）， which was higher than that （70.59%， 36/51） in the control group （P0.05）. No adverse reactions associated with Ershen Zhenwu Decoction were observed during the study period. ConclusionErshen Zhenwu Decoction can improve the cardiac function， exercise tolerance， and quality of life， regulate neuroendocrine factors， and slow down/reverse myocardial remodeling in the patients with HFrEF and HFmrEF （syndrome of heart-kidney Yang deficiency and blood stasis by regulating the miR-423-5p/Smad7/TGF-β₁/Smads axis， inhibiting α-SMA and Fn expression， and alleviating myocardial fibrosis. It is worthy of further study.

Objective: To fabricate a hydrogel loaded with inositol hexaphosphate-zinc and preliminarily evaluate its performance in self-mineralization and osteoinduction, thereby providing a theoretical basis for the development of bone regeneration materials. Methods: The hydrogel framework (designated DF0) was formed by copolymerizing methacryloyloxyethyltrimethylammonium chloride and four-armed poly(ethylene glycol) acrylate, followed by sequentially loading inositol hexaphosphate anions via electrostatic interaction and zinc ions via chelation. The hydrogel loaded only with inositol hexaphosphate anions was named DF1, while the co-loaded hydrogel was named DF2. The self-mineralization efficacy of the DF0 , DF1 and DF2 hydrogels was characterized using scanning electron microscopy, transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and selected area electron diffraction (SAED). The biocompatibility was assessed via live/dead cell staining and a CCK-8 assay. The osteoinductive capacity of the DF0 , DF1 and DF2 hydrogels on MC3T3-E1 cells was assessed via alkaline phosphatase (ALP) and Alizarin Red S (ARS) staining. In the aforementioned cell experiments, cells cultured in standard medium served as the control group Results: The DF0, DF1, and DF2 hydrogels were successfully synthesized. Notably, DF1 and DF2 exhibited distinct self-mineralization within 6 days. Results from TEM, EDS, and SAED confirmed that the mineralization products were amorphous calcium phosphate in group DF1, and amorphous calciumzinc phosphate in group DF2. Biocompatibility tests revealed that none of the hydrogels (DF0, DF1, and DF2) adversely affected cell viability or proliferation. In osteogenic induction experiments, both ALP and ARS staining were intensified in the DF1 and DF2 groups, with the most profound staining observed in the DF2 group. Conclusion The developed inositol hexaphosphate-zinc hydrogel (DF2) demonstrates the dual capacity to generate calcium-phosphate compounds through self-mineralization while exhibiting excellent osteoinductive properties. This biocompatible, dual-promoting osteogenic hydrogel presents a novel strategy for bone regeneration.

ObjectiveTo construct a scale for the diagnosis of chronic atrophic gastritis （CAG） with turbid toxin accumulating in the stomach. MethodsFirst， a research group was established to construct the scale framework. Relevant literature of CAG with syndrome of turbid toxin accumulating in the stomach was searched in CNKI， Wanfang Database （WF）， and VIP Database （CQVIP） from April 1， 2003 to April 1， 2023， and items were preliminarily selected after standardization of terms. Through clinical investigation， the discrete trend method， correlation coefficient method， Cronbach's coefficient method， and factor analysis method were used to screen symptom items， and the frequency method was used to screen signs， tongue coating， and pulse conditions. Three rounds of Delphi expert consultation were conducted to determine the items of the scale. The weight of each item was obtained by the analytic hierarchy process. ResultsA total of 49 articles were included， and 45 items were obtained after primary screening， including 28 symptoms， 2 signs， 10 tongue coatings， and 5 pulse conditions. After clinical investigation， 15 symptoms were retained， and 8 signs and pulse conditions of tongue coating were retained. The positive coefficients of experts in three rounds of Delphi expert consultation were 100%， 96.67%， and 100%， respectively. The expert authority coefficients were 0.86， 0.87， and 0.87， respectively， and the coordination coefficients were 0.18， 0.25， and 0.30. After core group discussion， Delphi method investigation， and AHP weight assignment， the diagnostic scale items of CAG with turbid toxin accumulating in stomach syndrome were finally established， namely， dark red or purplish tongue proper with yellow greasy （or dry） coating （30 points）， epigastric stuffiness and fullness or pain （15 points）， sticky and unsmooth defecation （10 points）， taste disturbance （sticky mouth， fetid breath， bitter taste， 7 points）， heartburn or acid regurgitation （6 points）， dizziness and clouding （5 points）， general heaviness and fatigue （5 points）， slippery， string‑slippery， or slippery‑rapid pulse （5 points）， dysuria （or yellow or deep yellow urine， 4 points）， poor appetite （4 points）， dull complexion （3 points）， sticky， greasy， and fetid secretions （3 points）， and poor sleep （3 points）. ConclusionBased on the establishment， screening， confirmation， and weighting of an item pool， combined with subjective and objective approaches as well as qualitative and quantitative methods， a diagnostic scale for CAG with the syndrome of turbid toxin accumulating in the stomach was successfully constructed.

BACKGROUND:Studies have shown that platelet-derived growth factor BB can stimulate the proliferation and osteogenic differentiation of mesenchymal stem cells and accelerate the calcification process of osteoblast-like cells.However,its clinical application has problems such as short half-life and easy decomposition.Loading the growth factor onto a suitable biomaterial scaffold can enable its slow and continuous release and maintain an effective concentration,which has become a hot topic in current research.OBJECTIVE:To observe the effect of chitosan/reduced graphene oxide scaffolds loaded with platelet-derived growth factor BB on the repair of alveolar bone defect in rats.METHODS:(1)Chitosan/reduced graphene oxide scaffolds(referred to as CS/rGO scaffolds)and chitosan/reduced graphene oxide scaffolds loaded with different mass concentrations(5,10,15,and 20 mg/L)of platelet-derived growth factor BB(referred to as CS/rGO/PDGF-BB-5,CS/rGO/PDGF-BB-10,CS/rGO/PDGF-BB-15,and CS/rGO/PDGF-BB-20 scaffolds)were prepared respectively.The five groups of scaffolds were co-cultured with rat periodontal ligament stem cells.The cell proliferation and migration were detected by CCK-8 assay and Transwell chamber assay,respectively,to screen the appropriate growth factor loading mass concentration for subsequent experiments.CS/rGO scaffolds(or extracts)and CS/rGO/PDGF-BB-15 scaffolds(or extracts)were co-cultured with rat periodontal ligament stem cells,and the osteogenic differentiation and angiogenic ability of the cells were detected.(2)The alveolar bone defect model was prepared in front of the bilateral maxillary first molars of 16 SD rats,and the rats were randomly divided into 4 intervention groups:the blank control group did not receive any intervention,the simple scaffold group was implanted with CS/rGO/PDGF-BB-15 scaffold,the control group was implanted with CS/rGO scaffold and rat periodontal ligament stem cell complex,and the experimental group was implanted with CS/rGO/PDGF-BB-15 scaffold and rat periodontal ligament stem cell complex,with 4 rats in each group.Twelve weeks after surgery,the bone repair of the alveolar bone defect was observed by Micro CT scanning and hematoxylin-eosin staining.RESULTS AND CONCLUSION:(1)CS/rGO/PDGF-BB-5,CS/rGO/PDGF-BB-10,CS/rGO/PDGF-BB-15,and CS/rGO/PDGF-BB-20 scaffolds could promote the proliferation and migration of rat periodontal ligament stem cells.Among them,the CS/rGO/PDGF-BB-15 scaffold had the most significant effect on promoting cell proliferation and migration,and this scaffold was used for subsequent experiments.Compared with the CS/rGO scaffold,the CS/rGO/PDGF-BB-15 scaffold could promote the osteogenic and angiogenic differentiation of rat periodontal ligament stem cells.(2)Micro CT scanning and hematoxylin-eosin staining results showed that the experimental group had the best alveolar bone defect repair effect,and a large amount of new bone tissue and blood vessel formation could be seen.(3)The chitosan/reduced graphene oxide scaffold loaded with platelet-derived growth factor BB can effectively promote the repair of rat alveolar bone defects by promoting the proliferation,migration,angiogenic and osteogenic differentiation of rat periodontal ligament stem cells.