OBJECTIVES: Osteoarthritis (OA) is one of the most common chronic degenerative diseases, with chondrocyte apoptosis and extracellular matrix (ECM) degradation as the major pathological changes. The mechanical stimulation can attenuate chondrocyte apoptosis and promote ECM synthesis, but the underlying molecular mechanisms remain unclear. This study aims to investigate the role of primary cilia (PC) in mediating the effects of mechanical stimulation on OA progression. METHODS: In vivo, conditional knockout mice lacking intraflagellar transport 88 (IFT88^flox/flox IFT88 knockout; i.e., primary cilia-deficient mice) were generated, with wild-type mice as controls. OA models were established via anterior cruciate ligament transection combined with destabilization of the medial meniscus, followed by treadmill exercise intervention. OA progression was evaluated by hematoxylin-eosin staining, safranin O-fast green staining, and immunohistochemistry; apoptosis was assessed by TUNEL staining; and limb function by rotarod testing. In vitro, primary articular chondrocytes were isolated from mice and transfected with lentiviral vectors to suppress IFT88 expression, thereby constructing a primary cilia-deficient cell model. Interleukin-1β (IL-1β) was used to induce an inflammatory environment, while cyclic tensile strain (CTS) was applied via a cell stretcher to mimic mechanical loading on chondrocytes. Immunofluorescence and Western blotting were used to detect the protein expression levels of type II collagen α1 chain (COL2A1), primary cilia, IFT88, and caspase-12; reverse transcription polymerase chain reaction was performed to assess COL2A1 mRNA levels; and flow cytometry was used to evaluate apoptosis. RESULTS: In vivo, treadmill exercise significantly reduced Osteoarthritis Research Society International (OARSI) scores and apoptotic cell rates, and improved balance ability in wild-type OA mice, whereas IFT88-deficient OA mice showed no significant improvement. In vitro, CTS inhibited IL-1β-induced ECM degradation and apoptosis in primary chondrocytes; however, this protective effect was abolished in cells with suppressed primary cilia expression. CONCLUSIONS Mechanical stimulation delays OA progression by mediating signal transduction through primary cilia, thereby inhibiting cartilage degeneration and chondrocyte apoptosis.
Animals ; Chondrocytes/cytology* ; Apoptosis/physiology* ; Mice ; Cilia/metabolism* ; Osteoarthritis/pathology* ; Extracellular Matrix/metabolism* ; Mice, Knockout ; Disease Progression ; Interleukin-1beta ; Male ; Cells, Cultured

Objective: To analyze the current situation, influencing factors and mechanism of knowledge-attitude-practice(KAP) regarding acquired immune deficiency syndrome(AIDS)/sexually transmitted diseases(STDs) among migrant workers in Chengdu's main urban area, so as to provide a basis for the development of effective prevention and control policies for this group. Methods: Convenience sampling and systematic sampling were used to collect demographic information and data on knowledge, attitudes, and sexual behavior characteristics of AIDS/STDs of the participants. The collected data were organized and statistically analyzed by EpiData 3.1 and SPSS 26.0 software. Additionally, a KAP path analysis model was constructed by using AMOS 24.0 software. Results: A total of 257 valid questionnaires were obtained. The AIDS awareness rate was 55.6%, with a mean scores of(5.59±1.61). The awareness rate of STDs was 37.4%, with a mean scores of(9.05±3.00). Discrimination attitudes towards AIDS and STDs were reported by 58 participants(22.6%) and 44 participants(17.1%) respectively. The prevalence of high-risk sexual behavior was 3.50%. Men(OR=0.500, 95%CI: 0.279-0.897) acted as deterrents to knowledge of AIDS. On the other hand, childlessness facilitated discrimination against AIDS(OR=2.748, 95%CI: 1.385-5.451) and STDs(OR=2.287, 95%CI: 1.084-4.825). There was lower likelihood of engaging in high-risk sexual behavior among migrant workers in Chengdu's main urban area who were older(OR=0.854, 95%CI: 0.785-0.929). The occurrence of high-risk sexual behaviors was influenced both directly and indirectly by attitudes towards AIDS and related knowledge. There was a positive correlation between knowledge about AIDS and STDs and attitudes towards them(r=0.15,0.24, bothP<0.05), as well as between attitudes towards AIDS and attitudes towards STDs(r=0.57,P<0.05). That is, the higher the scores of knowledge, the less likely one was to hold discrimination attitudes. Therefore, increasing the rate of knowledge awareness could reduce discrimination towards AIDS/STDs and the occurrence of high-risk sexual behaviors. Conclusion The level of AIDS/STDs knowledge among the migrant workers in Chengdu′s main urban area is concerning. Innovative interventions should be intensified in key areas and populations.

Objective To predict the mechanism of Chaihu Shugan Powder against depression based on network pharmacology and molecular docking technology;To verify them through animal experiment of chronic unpredictable mild stress(CUMS)depression model rats.Methods TCMSP was used to screen the active components of Chaihu Shugan Powder and the related targets were obtained.Disease targets were retrieved by DisGeNET,GeneCards and GEO databases.The protein-protein interaction(PPI)network construction,GO and KEGG pathway enrichment analyses were conducted to determine the action pathway of Chaihu Shugan Powder against depression.Molecular docking of main active components and potential targets was performed.The depression model was established by CUMS combined with solitary rearing method,in which Chaihu Shugan Powder and PI3K specific inhibitor LY294002 were used to intervene depression model rats.Western blot and qPCR were respectively used to detect the action pathway related proteins and mRNAs.ELISA was used to detect the contents of monoamine neurotransmitters 5-HT and NE in hippocampal tissue,and their pathways of action were integrated and analyzed.Results Totally 118 active components of Chaihu Shugan Powder against depression and 74 potential targets were screened;KEGG pathway enrichment analysis indicated that action pathway of Chaihu Shugan Powder against depression were closely related to PI3K-Akt signaling pathway,AGE-RAGE signaling pathway in diabetic complications,etc.Molecular docking showed that quercetin,kaempferol,β-sitosterol,isorhamnetin,naringenin had good binding activity with AKT1,PIK3CA,GSK3B,IL6,IL1B.The animal experiments showed that Chaihu Shugan Powder could improve the depression-like behavior of model rats,increase the phosphorylation levels of PI3K and Akt in hippocampal tissue,down-regulate the expression of GSK3β,and increase the contents of 5-HT and NE.LY294002 could reverse the effect of Chaihu Shugan Powder.The results of integration analysis showed that PI3K/Akt signaling pathway of Chaihu Shugan Powder was closely related to metabolism of 5-HT and NE.Conclusion Chaihu Shugan Powder can exert antidepressant effects by activating the PI3K/Akt signaling pathway,inhibiting the expression of GSK3β,and increasing the levels of monoamine neurotransmitters 5-HT and NE.

Objective:To investigate the immunomodulatory effect of mixed konjac glucomannan(MKGM)on cyclophosphamide-induced immunosuppressed mice.Methods:The immunosuppressed mice model was established by cyclophosphamide.After treatment with MKGM for 25 d,organ index,lymphocyte proliferation,macrophage function,NK cell killing,and cytokine secretion of mice were observed.Results:Immunomodulatory effect of MKGM was firstly enhanced and then declined.Compared to model group,there were significant differences in organ index,lymphocyte proliferation,macrophage function,NK cell killing,and hemolysin in the medium-dose MKGM group(P＜0.01).HE staining showed that the low-dose MKGM had the best effect on repairing spleen injury caused by cyclophosphamide.However,medium-and high-dose MKGM had relatively weak immunomodulatory effects.Conclusion:The appropriate dose of MKGM can play an immunomodulatory role in the cyclophosphamide-induced immunosuppressed mice.

Objective To evaluate the effectiveness and safety of ultrasound-guided microwave ablation technique in the treatment of benign thyroid nodules.Methods A total of 3985 nodules in 2913 patients with pathologically confirmed benign thyroid nodules during 2016-2023 were analyzed retrospectively.The one-time ablation success rate,incidence rate of postoperative complications and side effects were evaluated.For 1890 ablation nodules in 1449 patients with a median follow-up period of 12 months,the nodule volume re-duction rate (VRR),recurrence rate,re-ablation rate and technical effective ablation rate were evaluated in postoperative 1,3,6,12,24 months and more.Results The success rate of one-time ablation in all patients was 99.7％ (3972/3985),the technical effective ablation rate was 88.6％ (535/604),the recurrence rate was 3.1％ (59/1890) and the re-ablation rate was 0.7％ (13/1890).In the follow-up nodules,VRR in postopera-tive 1,3,6,12,24 months and more was (-17±430)％ (n=727),(48±152)％ (n=643),(72±38)％ (n=573),(83±20)％ (n=604),(88±18)％ (n=279),respectively.In all patients,the incidence rate of major complications was 2.57％,the incidence rate of minor complications was 2.06％,and the incidence of side effects was 3.09％.Conclusion Ultrasound-guided microwave ablation of thyroid nodules is an effective and safe method for the treatment of benign thyroid nodules.

Attention deficit disorder(ADHD)is a common neurodevelopmental disorder in childhood,which seriously affects the physical and mental health of children.Up to now,the etiology and pathogenesis of ADHD are not clear,which is also the focus of global research.Animal model is an important carrier for basic research of ADHD,but the use of ADHD animal model is still controversial.This paper introduces the main emerging ADHD animal models in the world in recent years and analyzes their advantages and disadvantages.The genetic model,environmental induction model and neurodevelopmental disorder model are introduced and summarized from three aspects:surface validity,construct validity and predictive validity.The purpose of this study is to find a suitable animal model for the basic research of ADHD and to provide reference for the basic research of ADHD in China.

Objective To evaluate the protective effect and underlying mechanism of ulinastatin on hepatic ischemia-reperfusion injury.Methods Twenty-four male SD rats were divided into three groups:sham operation group(Sham group),hepatic ischemia-reperfusion injury group(HIRI group)and hepatic ischemia-reperfusion injury+ulinastatin pretreatment group(HIRI+UTI group),with 8 rats in each group.The HIRI rat models were established by occluding hepatic portal vein and hepatic artery for 1 h.In the HIRI+UTI group,the rats were intraperitoneally injected with ulinastatin at 30 min before model establishment,and an equivalent amount of normal saline was given in the Sham and HIRI groups.The rats were sacrificed at 6 h after model establishment.Serum samples were collected to detect alanine aminotransferase(ALT)and aspartate aminotransferase(AST)levels.Pathological changes of liver tissues were observed by hematoxylin-eosin(HE)staining.Ultrastructural changes of mitochondria in liver tissues were observed by transmission electron microscopy.The expression of glutathione peroxidase 4(GPX4)was determined by immunofluorescent staining.The contents of malondialdehyde(MDA),glutathione(GSH),Fe,reactive oxygen species(ROS)and GPX4 were detected.The expression levels of GPX4 and acyl-CoA synthetase long-chain family 4(ACSL4)messenger RNA(mRNA)and proteins in liver tissue were measured.Results Compared with the Sham group,serum ALT and AST levels were up-regulated,pathological changes such as congestion,hepatocyte necrosis and abnormal hepatic lobule structure were observed,pathological score was increased,the mitochondria shrank,the membrane density was increased,the mitochondrial crest was damaged or even absent,the contents of ROS,MDA and Fe were elevated,the GSH content was decreased,the fluorescent intensity of GPX4 was weakened,the relative expression levels of ACSL4 mRNA and protein were up-regulated,and the relative expression levels of GPX4 mRNA and protein were down-regulated in the HIRI group(all P＜0.05).Compared with the HIRI group,serum ALT and AST levels were down-regulated,liver tissue injury was alleviated,pathological score was decreased,mitochondrial shrinkage and crest breakage were mitigated,the contents of ROS,MDA and Fe were down-regulated,the GSH content was up-regulated,the fluorescent intensity of GPX4 was enhanced,the relative expression levels of ACSL4 mRNA and protein were down-regulated,and the relative expression levels of GPX4 mRNA and protein were up-regulated in the HIRI+UTI group(all P＜0.05).Conclusions Ulinastatin may alleviate hepatic ischemia-reperfusion injury in rats probably through inhibiting ferroptosis.

Objective To investigate the clinicopathological features,immunophenotypes,molecular genetic alterations,and prognosis of succinate dehydrogenase-deficient renal cell carcinoma(SDH-RCC).Methods A total of 11 cases of SDH-RCC diagnosed at West China Hospital,Sichuan University between 2016 and 2023 were selected for clinicopathological,immunohistochemical,and DNA sequencing analyses.Results Among the 11 cases of SDH-RCC,there were 5 male patients and 6 female patients.The patients'ages ranged from 12 to 71 years,with an average age of 39.7 years.Among them,5 patients had tumors located in the right kidney,5 had tumors located in the left kidney,and 1 patient had bilateral tumors.Microscopic observation showed that the tumor cells of the SDH-RCC patients displayed a wide spectrum of structures,forming sheet-like,nested,and glandular structures.In addition,tumor cells in papillary structures were observed in some cases.The tumor cells had abundant cytoplasm,was eosinophilic,and contained flocculent materials.Intracytoplasmic vacuolations were observed in some of the cells.Among all the patients,7(7/11,63.6％)showed typical low-grade features(grade 1-2 according to the International Society of Urological Pathology[ISUPJ/WHO 2016 classification),and 4(4/11,36.4％)showed high-grade features(grade 3 according to the ISUP/WHO 2016 classification).The average ages of patients with low-grade and high-grade features were 32.1 years and 58.0 years,respectively.Immunohistochemical staining of all 11 cases demonstrated negative results for SDHB and cytokeratin 7(CK7),and positive staining results for paired box 8(PAX-8),fumarate hydratase(FH),and epithelial membrane antigen(EMA).Their Ki-67 index was l％-30％.In one case,the loss of SDHB expression was also accompanied by a loss of SDHA expression.Sanger sequencing was performed to examine all the exons of SDHB in 7 cases.One case showed a frameshift mutation,c.236Tdel(p.K80Rfs*),and another case harbored a missense mutation,c.725G＞A(p.Arg242His).In another case,next generation sequencing revealed that large fragments of SDHB(Exon 4-8 del)were missing.Follow-up data were available for 10 patients.The follow-up time ranged from 4 to 138 months,with the average being 32.8 months,and all patients survived.Metastasis and recurrence were reported in 5 cases,with 3 of them showing high-grade features and 2 showing low-grade features.Conclusion SDH-RCC is rare and the patients demonstrate a relatively young age of onsets.Patients may present with bilateral tumors.Tumors with low-grade features usually occur in young patients,with their Ki-67 index usually being lower than 5％.Individual cases may experience tumor recurrence and metastasis over a long period of follow-up.Tumors with high-grade features tend to occur in older patients who have a higher Ki-67 index,and who are prone to recurrence and metastasis.Negative immunohistochemical staining results for SDHB can assist in tumor diagnosis,but the loss of SDHB protein expression does not necessarily lead to the detection of SDHB gene mutation.

Parkinson's disease (PD) is a common neurodegenerative disease in middle-aged and elderly people. In particular, increasing evidence has showed that astrocyte-mediated neuroinflammation is involved in the pathogenesis of PD. As a precious traditional Chinese medicine, bear bile powder (BBP) has a long history of use in clinical practice. It has numerous activities, such as clearing heat, calming the liver wind and anti-inflammation, and also exhibits good therapeutic effect on convulsive epilepsy. However, whether BBP can prevent the development of PD has not been elucidated. Hence, this study was designed to explore the effect and mechanism of BBP on suppressing astrocyte-mediated neuroinflammation in a mouse model of PD. PD-like behavior was induced in the mice by intraperitoneal injection of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) (30 mg·kg^-1) for five days, followed by BBP (50, 100, and 200 mg·kg^-1) treatment daily for ten days. LPS stimulated rat C6 astrocytic cells were used as a cell model of neuroinflammation. THe results indicated that BBP treatment significantly ameliorated dyskinesia, increased the levels of tyrosine hydroxylase (TH) and inhibited astrocyte hyperactivation in the substantia nigra (SN) of PD mice. Furthermore, BBP decreased the protein levels of glial fibrillary acidic protein (GFAP), cyclooxygenase 2 (COX2) and inducible nitric oxide synthase (iNOS), and up-regulated the protein levels of takeda G protein-coupled receptor 5 (TGR5) in the SN. Moreover, BBP significantly activated TGR5 in a dose-dependent manner, and decreased the protein levels of GFAP, iNOS and COX2, as well as the mRNA levels of GFAP, iNOS, COX2, interleukin (IL) -1β, IL-6 and tumor necrosis factor-α (TNF-α) in LPS-stimulated C6 cells. Notably, BBP suppressed the phosphorylation of protein kinase B (AKT), inhibitor of NF-κB (IκBα) and nuclear factor-κB (NF-κB) proteins in vivo and in vitro. We also observed that TGR5 inhibitor triamterene attenuated the anti-neuroinflammatory effect of BBP on LPS-stimulated C6 cells. Taken together, BBP alleviates the progression of PD mice by suppressing astrocyte-mediated inflammation via TGR5.
Humans ; Mice ; Rats ; Animals ; Aged ; Middle Aged ; Parkinson Disease/pathology* ; Astrocytes/pathology* ; Powders/therapeutic use* ; Ursidae/metabolism* ; NF-kappa B/metabolism* ; Neuroinflammatory Diseases ; Neurodegenerative Diseases/metabolism* ; Cyclooxygenase 2/metabolism* ; Lipopolysaccharides/pharmacology* ; Bile ; Mice, Inbred C57BL ; Microglia ; Disease Models, Animal

Humans ; Parkinson Disease/diagnosis* ; Machine Learning