1.Mechanism of sodium valproate in inhibiting ferroptosis of bone marrow mesenchymal stem cells via the adenosine monophosphate-activated protein kinase/Sirtuin 1 axis.
Qingsong GU ; Jianqiao LI ; Yuhu CHEN ; Linhui WANG ; Yiheng LI ; Ziru WANG ; Yicong WANG ; Min YANG
Chinese Journal of Reparative and Reconstructive Surgery 2025;39(2):215-223
OBJECTIVE:
To investigate the effects of sodium valproate (VPA) in inhibiting Erastin-induced ferroptosis in bone marrow mesenchymal stem cells (BMSCs) and its underlying mechanisms.
METHODS:
BMSCs were isolated from bone marrow of 8-week-old Spragur Dawley rats and identified [cell surface antigens CD90, CD44, and CD45 were analyzed by flow cytometry, and osteogenic and adipogenic differentiation abilities were assessed by alizarin red S (ARS) and oil red O staining, respectively]. Cells of passage 3 were used for the Erastin-induced ferroptosis model, with different concentrations of VPA for intervention. The optimal drug concentration was determined using the cell counting kit 8 assay. The experiment was divided into 4 groups: group A, cells were cultured in osteogenic induction medium for 24 hours; group B, cells were cultured in osteogenic induction medium containing optimal concentration Erastin for 24 hours; group C, cells were cultured in osteogenic induction medium containing optimal concentration Erastin and VPA for 24 hours; group D, cells were cultured in osteogenic induction medium containing optimal concentration Erastin and VPA, and 8 μmol/L EX527 for 24 hours. The mitochondrial state of the cells was evaluated, including the levels of malondialdehyde (MDA), glutathione (GSH), and reactive oxygen species (ROS). Osteogenic capacity was assessed by alkaline phosphatase (ALP) activity and ARS staining. Western blot analysis was performed to detect the expressions of osteogenic-related proteins [Runt-related transcription factor 2 (RUNX2) and osteopontin (OPN)], ferroptosis-related proteins [glutathione peroxidase 4 (GPX4), ferritin heavy chain 1 (FTH1), and solute carrier family 7 member 11 (SLC7A11)], and pathway-related proteins [adenosine monophosphate-activated protein kinase (AMPK) and Sirtuin 1 (SIRT1)].
RESULTS:
The cultured cells were identified as BMSCs. VPA inhibited Erastin-induced ferroptosis and the decline of osteogenic ability in BMSCs, acting through the activation of the AMPK/SIRT1 pathway. VPA significantly reduced the levels of ROS and MDA in Erastin-treated BMSCs and significantly increased GSH levels. Additionally, the expression levels of ferroptosis-related proteins (GPX4, FTH1, and SLC7A11) significantly decreased. VPA also upregulated the expressions of osteogenic-related proteins (RUNX2 and OPN), enhanced mineralization and osteogenic differentiation, and increased the expressions of pathway-related proteins (AMPK and SIRT1). These effects could be reversed by the SIRT1 inhibitor EX527.
CONCLUSION
VPA inhibits ferroptosis in BMSCs through the AMPK/SIRT1 axis and promotes osteogenesis.
Mesenchymal Stem Cells/metabolism*
;
Ferroptosis/drug effects*
;
Animals
;
Valproic Acid/pharmacology*
;
Rats
;
Rats, Sprague-Dawley
;
Sirtuin 1/metabolism*
;
Cell Differentiation/drug effects*
;
Cells, Cultured
;
AMP-Activated Protein Kinases/metabolism*
;
Osteogenesis/drug effects*
;
Piperazines/pharmacology*
;
Bone Marrow Cells/cytology*
;
Reactive Oxygen Species/metabolism*
;
Signal Transduction/drug effects*
2.Impacts of curcumin on proliferation, migration and cisplatin resistance of bladder cancer cells by regulating LKB1-AMPK-LC3 signaling pathway.
Chinese Journal of Cellular and Molecular Immunology 2025;41(1):9-16
Objective To study the impacts of curcumin on the proliferation, migration and cisplatin (DDP) resistance of bladder cancer cells by regulating the liver kinase B1-AMP activated protein kinase-microtubule-associated protein 1 light chain 3 (LKB1-AMPK-LC3) signaling pathway. Methods Human bladder cancer cell line T24 was cultured in vitro, and its DDP resistant T24/DDP cells were induced by cisplatin (DDP). After treating T24 and T24/DDP cells with different concentrations of curcumin, the optimal concentration of curcumin was screened by MTT assay. T24 cells were randomly grouped into control group, curcumin group, metformin group, and combination group of curcumin and metformin. After treatment with curcumin and LKB1-AMPK activator metformin, the proliferation, autophagy, migration, and apoptosis of T24 cells in each group were detected by MTT assay, monodansylcadavrine (MDC) fluorescence staining, cell scratch assay, and flow cytometry, respectively. Western blot was used to detect the expression of proteins related to LKB1-AMPK-LC3 signaling pathway in T24 cells of each group. T24/DDP cells were randomly assigned into control group, curcumin group, metformin group, and combination group of curcumin and metformin. Cells were treated with curcumin and metformin according to grouping and treated with different concentrations of DDP simultaneously. Then, the effect of curcumin on the DDP resistance coefficient of T24/DDP cells was detected by MTT assay. T24/DDP cells were randomly grouped into control group, DDP group, combination groups of DDP and curcumin, DDP and metformin, DDP, curcumin and metformi. After treatment with DDP, curcumin, and metformin, the proliferation, autophagy, migration, apoptosis, drug resistance, and the expression of proteins related to LKB1-AMPK-LC3 signaling pathway in T24/DDP cells of each group were detected with the same methods. Results Compared with the control group, the activity of T24 cells, relative number of autophagosomes, migration rate, Phosphorylated-LKB1 (p-LKB1)/LKB1, Phosphorylated-AMPK (p-AMPK)/AMPK, LC3II/LC3I, and the DDP resistance coefficient of T24/DDP cells in the curcumin group were lower, and the apoptosis rate of T24 cells was higher; the changes in various indicators in the metformin group were opposite to those in the curcumin group. Compared with the curcumin group, the activity of T24 cells, relative number of autophagosomes, migration rate, p-LKB1/LKB1, p-AMPK/AMPK, LC3II/LC3I, and the DDP resistance coefficient of T24/DDP cells in the combination group of curcumin and metformin were higher, and the apoptosis rate of T24 cells was lower. Compared with the control group, there were no obvious changes in various indicators of T24/DDP cells in the DDP group. Compared with the control group and DDP group, the viability of T24/DDP cells, relative number of autophagosomes, migration rate, P-glycoprotein (P-gp) protein expression, p-LKB1/LKB1, p-AMPK/AMPK, and LC3II/LC3I in the combination group of DDP and curcumin were lower, and the apoptosis rate of T24/DDP cells was higher; the changes in the above indicators in the combination group of DDP and metformin were opposite to those in the combination group of DDP and curcumin. Compared with the combination group of DDP and curcumin, the viability of T24/DDP cells, relative number of autophagosomes, migration rate, P-gp protein expression, p-LKB1/LKB1, p-AMPK/AMPK, and LC3II/LC3I in the combination group of DDP, curcumin and metformin were higher, and the apoptosis rate of T24/DDP cells was lower. Conclusion Curcumin can reduce the activity of LKB1-AMPK-LC3 signaling pathway, thereby inhibiting autophagy, proliferation and migration of bladder cancer cells, promoting their apoptosis, and weakening their resistance to DDP.
Humans
;
Cisplatin/pharmacology*
;
Curcumin/pharmacology*
;
Cell Proliferation/drug effects*
;
Signal Transduction/drug effects*
;
Protein Serine-Threonine Kinases/genetics*
;
AMP-Activated Protein Kinases/metabolism*
;
Drug Resistance, Neoplasm/drug effects*
;
Urinary Bladder Neoplasms/pathology*
;
Cell Line, Tumor
;
Cell Movement/drug effects*
;
AMP-Activated Protein Kinase Kinases
;
Microtubule-Associated Proteins/metabolism*
;
Apoptosis/drug effects*
;
Antineoplastic Agents/pharmacology*
;
Metformin/pharmacology*
;
Autophagy/drug effects*
3.Salidroside alleviates high glucose and ethanol-induced pyroptosis in insulinoma cells.
Xiao-Han LI ; Xu GUO ; Shi-Qi CHEN ; Yan-Guo GAO ; Jun ZHOU ; Yong-Hong ZHANG ; Qi-Bin WANG ; Li CHEN ; Tao ZHENG
China Journal of Chinese Materia Medica 2024;49(22):6181-6189
This study established a pyroptosis injury model by stimulating insulinoma cells(INS-1) of rats with high glucose(HG) and observed the impact of additional ethanol(ET) exposure on cell pyroptosis, as well as the intervention effect of salidroside(SAL). INS-1 cells were cultured and divided into a normal control group(NG), an HG group, an HG + ET(100 mmol·L~(-1)) group, and an HG + ET + SAL(1-100 μmol·L~(-1)) group. After 72 hours of treatment, cell viability was assessed using the cell counting kit-8(CCK-8) assay. The number of pyroptotic bodies was observed under a microscope. Western blot was used to detect changes in the intracellular Nod-like receptor protein 3(NLRP3)/gasdermin D(GSDMD) signaling pathway and adenosine monophosphate-activated protein kinase(AMPK) activity. A fluorescence probe was used to detect changes in intracellular reactive oxygen species(ROS) levels. Time-resolved fluorescence resonance energy transfer(TR-FRET) technology was employed to observe the effect of SAL on recombinant AMPK protein kinase activity in vitro. The results showed that compared to the NG group, HG exposure induced an increase in the number of pyroptotic bodies, elevated ROS levels, and activation of the NLRP3/GSDMD signaling pathway in INS-1 cells. Compared to the HG group, HG + ET exposure further exacerbated these changes. Compared to the HG + ET group, SAL dose-dependently increased cell viability, reduced the formation of pyroptotic bodies in INS-1 cells, and inhibited excessive ROS production, overactivation of the NLRP3/GSDMD signaling pathway, and the decrease in AMPK activity. TR-FRET experiments indicated that SAL could directly activate AMPK. When INS-1 cells were pretreated with an AMPK inhibitor, the effects of SAL on increasing cell viability, alleviating the formation of pyroptotic bodies, and inhibiting excessive ROS production were abolished. These results suggest that SAL can alleviate HG combined with ET-induced exacerbation of INS-1 pyroptosis by activating AMPK.
Pyroptosis/drug effects*
;
Animals
;
Rats
;
Glucose/metabolism*
;
Insulinoma/metabolism*
;
Ethanol/pharmacology*
;
Reactive Oxygen Species/metabolism*
;
Glucosides/pharmacology*
;
Phenols/pharmacology*
;
Cell Line, Tumor
;
Signal Transduction/drug effects*
;
NLR Family, Pyrin Domain-Containing 3 Protein/genetics*
;
Cell Survival/drug effects*
;
AMP-Activated Protein Kinases/metabolism*
;
Phosphate-Binding Proteins/genetics*
4.Qihuang Jianpi Zishen Granules improves thrombocytopenia in mice with systemic lupus erythematosus by suppressing platelet autophagy via the Ca2+/CaMKK2/AMPK/mTOR signaling pathway.
Yunfei LI ; Lijun PANG ; Longwu SHU ; Ming LI ; Chuanbing HUANG
Journal of Southern Medical University 2024;44(12):2327-2334
OBJECTIVES:
To explore the mechanism of Qihuang Jianpi Zishen Granules (QJZG) for improving thrombocytopenia in a mouse model of systemic lupus erythematosus (SLE).
METHODS:
Twenty-four MRL/lpr lupus mice were randomized equally into 4 groups for treatment with daily gavage of saline, QJZG or prednisone (Pred) or intraperitoneal injection (twice a week) of CaMKK2 activator, with 6 C57BL/6 mice with saline gavage as the control group. After 8 weeks of treatment, the mice were examined for PLT, PCT, PDW, MPV, serum levels of TPO, IL-6, IL-10, TNF-α and IFN-γ, and calcium ion fluorescence intensity using ELISA or flow-through assay. RT-qPCR was used to detect platelet CaMKK2, AMPK2α, mTOR, Beclin1 and p62 mRNA expression levels, and the protein expressions of CaMKK2, p-CaMKK2, AMPK, p-AMPK, mTOR, p-mTOR, LC3, Beclin1 and p62 were detected using Western blotting.
RESULTS:
The saline-treated MRL/lpr lupus mice showed significantly lowered levels of PLT, PCT, IL-10, mTOR, p62 mRNA, p-mTOR and P62 with increased PDW, MPV, serum TPO, IL-6, TNF-α and IFN-γ levels, and platelet expressions of CaMKK2, AMPK, Bcl-1 mRNA, p-CaMKK2, p-AMPK, LC3II and Beclin1. These abnormalities were significantly improved in QJZG group and Pred group but worsened after treatment with the CaMKK2 activator.
CONCLUSIONS
QJZG can ameliorate thrombocytopenia in mouse models of SLE by reducing inflammation and inhibiting platelet autophagy via regulating the Ca2+/CaMKK2/AMPK/mTOR signaling pathways.
Animals
;
Lupus Erythematosus, Systemic/metabolism*
;
Mice
;
Calcium-Calmodulin-Dependent Protein Kinase Kinase/metabolism*
;
Drugs, Chinese Herbal/pharmacology*
;
TOR Serine-Threonine Kinases/metabolism*
;
Thrombocytopenia/metabolism*
;
Signal Transduction/drug effects*
;
Autophagy/drug effects*
;
AMP-Activated Protein Kinases/metabolism*
;
Disease Models, Animal
;
Mice, Inbred C57BL
;
Mice, Inbred MRL lpr
;
Calcium/blood*
;
Blood Platelets/metabolism*
5.Protective effect of metformin on pulmonary fibrosis caused by paraquat through activating AMP-activated protein kinase pathway.
Tongying LIU ; Lihong GAO ; Jianhong WANG ; Liaozhang WU ; Manhong ZHOU
Chinese Critical Care Medicine 2023;35(12):1309-1315
OBJECTIVE:
To observe whether metformin (MET) inhibits transforming growth factor-β1 (TGF-β1)/Smad3 signaling pathway by activating adenosine activated protein kinase (AMPK), so as to alleviate the pulmonary fibrosis caused by paraquat (PQ) poisoning in mice.
METHODS:
Male C57BL/6J mice were randomly divided into the Control group, PQ poisoning model group (PQ group), MET intervention group (PQ+MET group), AMPK agonist group (PQ+AICAR group), and AMPK inhibitor group (PQ+MET+CC group), according to a random number table method. A mouse model of PQ poisoning was established by one-time peritoneal injection of 1 mL PQ solution (20 mg/kg). The Control group was injected with the same volume of normal saline. After 2 hours of modeling, the PQ+MET group was given 2 mL of 200 mg/kg MET solution by gavage, the PQ+AICAR group was given 2 mL of 200 mg/kg AICAR solution by intraperitoneal injection, the PQ+MET+CC group was given 2 mL of 200 mg/kg MET solution by gavage and then 1 mL complex C (CC) solution (20 mg/kg) was intraperitoneally injected, the Control group and PQ group were given 2 mL of normal saline by gavage. The intervention was given once a day for 21 consecutive days. The 21-day survival rate of ten mice in each group was calculated, and the lung tissues of remaining mice were collected at 21 days after modeling. The pathological changes of lung tissues were observed under light microscope after hematoxylin-eosin (HE) staining and Masson staining, and the degree of pulmonary fibrosis was evaluated by Ashcroft score. The content of hydroxyproline in lung tissue and oxidative stress indicators such as malondialdehyde (MDA) and superoxide dismutase (SOD) were detected. The protein expressions of E-cadherin, α-smooth muscle actin (α-SMA), phosphorylated AMPK (p-AMPK), TGF-β1 and phosphorylated Smad3 (p-Smad3) in lung tissue were detected by Western blotting.
RESULTS:
Compared with the Control group, the 21 days survival rate was significantly reduced, lung fibrosis and Ashcroft score were significantly increased in PQ group. In addition, the content of hydroxyproline, MDA and the protein expressions of α-SMA, TGF-β1 and p-Smad3 in lung tissue were significantly increased, while the activity of SOD and the protein expressions of E-cadherin and p-AMPK were significantly decreased in PQ group. Compared with the PQ group, the 21 days survival rates of mice were significantly improved in the PQ+MET group and PQ+AICAR group (70%, 60% vs. 20%, both P < 0.05). The degree of pulmonary fibrosis and the Ashcroft score were significantly reduced (1.50±0.55, 2.00±0.63 vs. 6.67±0.52, both P < 0.05). The content of hydroxyproline and MDA in lung tissue, as well as α-SMA, TGF-β1 and p-Smad3 protein expressions were significantly reduced [hydroxyproline (mg/L): 2.03±0.11, 3.00±0.85 vs. 4.92±0.65, MDA (kU/g): 2.06±1.48, 2.10±1.80 vs. 4.06±1.33, α-SMA/GAPDH: 0.23±0.06, 0.16±0.06 vs. 1.00±0.09, TGF-β1/GAPDH: 0.28±0.03, 0.53±0.05 vs. 0.92±0.06 p-Smad3/GAPDH: 0.52±0.04, 0.69±0.06 vs. 1.11±0.10, all P < 0.05], SOD activity and the protein expressions of E-cadherin and p-AMPK were significantly increased [SOD (μmol/g): 39.76±1.35, 33.03±1.28 vs. 20.08±1.79, E-cadherin/GAPDH: 0.91±0.08, 0.72±0.08 vs. 0.26±0.04, p-AMPK/GAPDH: 0.62±0.04, 0.60±0.01 vs. 0.20±0.04, all P < 0.05]. However, these protective effects of MET were inhibited by the addition of AMPK inhibitor CC solution.
CONCLUSIONS
MET can effectively alleviate the degree of pulmonary fibrosis in mice poisoned with PQ, and its mechanism may be related to the activation of AMPK and inhibition of TGF-β1/Smad3 signaling pathway, which can be inhibited by AMPK inhibitor CC.
Mice
;
Male
;
Animals
;
Pulmonary Fibrosis/drug therapy*
;
Paraquat
;
AMP-Activated Protein Kinases/pharmacology*
;
Metformin/pharmacology*
;
Hydroxyproline/pharmacology*
;
Saline Solution
;
Mice, Inbred C57BL
;
Lung/metabolism*
;
Transforming Growth Factor beta1/pharmacology*
;
Cadherins
;
Superoxide Dismutase
6.Mulberry leaf flavonoids activate BAT and induce browning of WAT to improve type 2 diabetes via regulating the AMPK/SIRT1/PGC-1α signaling pathway.
Long CHENG ; Lu SHI ; Changhao HE ; Chen WANG ; Yinglan LV ; Huimin LI ; Yongcheng AN ; Yuhui DUAN ; Hongyu DAI ; Huilin ZHANG ; Yan HUANG ; Wanxin FU ; Weiguang SUN ; Baosheng ZHAO
Chinese Journal of Natural Medicines (English Ed.) 2023;21(11):812-829
Mulberry (Morus alba L.) leaf is a well-established traditional Chinese botanical and culinary resource. It has found widespread application in the management of diabetes. The bioactive constituents of mulberry leaf, specifically mulberry leaf flavonoids (MLFs), exhibit pronounced potential in the amelioration of type 2 diabetes (T2D). This potential is attributed to their ability to safeguard pancreatic β cells, enhance insulin resistance, and inhibit α-glucosidase activity. Our antecedent research findings underscore the substantial therapeutic efficacy of MLFs in treating T2D. However, the precise mechanistic underpinnings of MLF's anti-T2D effects remain the subject of inquiry. Activation of brown/beige adipocytes is a novel and promising strategy for T2D treatment. In the present study, our primary objective was to elucidate the impact of MLFs on adipose tissue browning in db/db mice and 3T3-L1 cells and elucidate its underlying mechanism. The results manifested that MLFs reduced body weight and food intake, alleviated hepatic steatosis, improved insulin sensitivity, and increased lipolysis and thermogenesis in db/db mice. Moreover, MLFs activated brown adipose tissue (BAT) and induced the browning of inguinal white adipose tissue (IWAT) and 3T3-L1 adipocytes by increasing the expressions of brown adipocyte marker genes and proteins such as uncoupling protein 1 (UCP1) and beige adipocyte marker genes such as transmembrane protein 26 (Tmem26), thereby promoting mitochondrial biogenesis. Mechanistically, MLFs facilitated the activation of BAT and the induction of WAT browning to ameliorate T2D primarily through the activation of AMP-activated protein kinase (AMPK)/sirtuin 1 (SIRT1)/peroxisome proliferator-activated receptor-gamma coactivator 1α (PGC-1α) signaling pathway. These findings highlight the unique capacity of MLF to counteract T2D by enhancing BAT activation and inducing browning of IWAT, thereby ameliorating glucose and lipid metabolism disorders. As such, MLFs emerge as a prospective and innovative browning agent for the treatment of T2D.
Mice
;
Animals
;
Adipose Tissue, Brown
;
Sirtuin 1/pharmacology*
;
Diabetes Mellitus, Type 2/metabolism*
;
AMP-Activated Protein Kinases/metabolism*
;
Morus/metabolism*
;
Flavonoids/metabolism*
;
Prospective Studies
;
Signal Transduction
;
Adipose Tissue, White
;
Plant Leaves
;
Uncoupling Protein 1/metabolism*
;
Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha/metabolism*
7.The development and benefits of metformin in various diseases.
Ying DONG ; Yingbei QI ; Haowen JIANG ; Tian MI ; Yunkai ZHANG ; Chang PENG ; Wanchen LI ; Yongmei ZHANG ; Yubo ZHOU ; Yi ZANG ; Jia LI
Frontiers of Medicine 2023;17(3):388-431
Metformin has been used for the treatment of type II diabetes mellitus for decades due to its safety, low cost, and outstanding hypoglycemic effect clinically. The mechanisms underlying these benefits are complex and still not fully understood. Inhibition of mitochondrial respiratory-chain complex I is the most described downstream mechanism of metformin, leading to reduced ATP production and activation of AMP-activated protein kinase (AMPK). Meanwhile, many novel targets of metformin have been gradually discovered. In recent years, multiple pre-clinical and clinical studies are committed to extend the indications of metformin in addition to diabetes. Herein, we summarized the benefits of metformin in four types of diseases, including metabolic associated diseases, cancer, aging and age-related diseases, neurological disorders. We comprehensively discussed the pharmacokinetic properties and the mechanisms of action, treatment strategies, the clinical application, the potential risk of metformin in various diseases. This review provides a brief summary of the benefits and concerns of metformin, aiming to interest scientists to consider and explore the common and specific mechanisms and guiding for the further research. Although there have been countless studies of metformin, longitudinal research in each field is still much warranted.
Humans
;
Metformin/pharmacokinetics*
;
Diabetes Mellitus, Type 2/metabolism*
;
Hypoglycemic Agents/pharmacology*
;
AMP-Activated Protein Kinases/metabolism*
;
Aging
8.Platelet-rich Plasma Induces M2 Macrophage Polarization via Regulating AMPK Singling Pathway.
Lin-Ying SHI ; Yan-Hui LI ; Jing-Jing XU ; Yu ZHANG ; Ting-Ting XIE ; Yu-Bing XU ; Gui-Qiu SHAN ; Mou ZHOU
Journal of Experimental Hematology 2023;31(5):1486-1491
OBJECTIVE:
To investigate the role of platelet-rich plasma (PRP) in inducing the M2 macrophage polarization via regulating AMPK singling pathway.
METHODS:
The expressions of M1 marker CD11c and M2 marker CD206 in macrophages of blank control group, LPS group, LPS+PRP group, and LPS+PRP+Compound C group were detected by flow cytometry. Western blot was used to observe the effects of PRP on the expression of AMPK-mTOR signaling pathway-related proteins at different times (12 h, 18 h and 24 h) after LPS treatment. RNA interference technology was used to silence the expression of AMPK in macrophages, and the expression of TGF-β protein was subsequently examined by Western blot.
RESULTS:
LPS significantly reduced the expression of CD206 and increased the expression of CD11c (P <0.05). After the addition of PRP, the expression of CD206 was significantly increased (P <0.05), while the expression of CD11c was significantly decreased (P <0.05). Compared with LPS group, PRP treatment significantly increased the expressions of p-AMPK and p-ULK1 proteins at 12 h, 18 h and 24 h, while significantly decreased the expression of p-mTOR protein (P <0.05). After the addition of AMPK inhibitor Compound C, the expression of CD206 was significantly reduced (P <0.05) and the expression of CD11c was significantly increased compared with LPS+PRP group (P <0.05). After silencing the expression of AMPK in macrophages, the promotion effect of PRP on TGF-β was significantly reduced (P <0.05).
CONCLUSION
PRP can stimulate the transformation of macrophages to M2 type via AMPK signalling pathway.
Humans
;
AMP-Activated Protein Kinases/pharmacology*
;
Lipopolysaccharides/pharmacology*
;
Macrophages/metabolism*
;
Transforming Growth Factor beta/metabolism*
;
Platelet-Rich Plasma/metabolism*
9.Emodin Ameliorates High Glucose-Induced Podocyte Apoptosis via Regulating AMPK/mTOR-Mediated Autophagy Signaling Pathway.
Hong LIU ; Wei-Dong CHEN ; Yang-Lin HU ; Wen-Qiang YANG ; Tao-Tao HU ; Huan-Lan WANG ; Yan-Min ZHANG
Chinese journal of integrative medicine 2023;29(9):801-808
OBJECTIVE:
To investigate the effect of emodin on high glucose (HG)-induced podocyte apoptosis and whether the potential anti-apoptotic mechanism of emodin is related to induction of adenosine-monophosphate-activated protein kinase (AMPK)/mammalian target of rapamycin (mTOR)-mediated autophagy in podocytes (MPC5 cells) in vitro.
METHODS:
MPC5 cells were treated with different concentrations of HG (2.5, 5, 10, 20, 40, 80 and 160 mmol/L), emodin (2, 4, 8 µ mol/L), or HG (40 mmol/L) and emodin (4 µ mol/L) with or without rapamycin (Rap, 100 nmol/L) and compound C (10 µ mol/L). The viability and apoptosis of MPC5 cells were detected using cell counting kit-8 (CCK-8) assay and flow cytometry analysis, respectively. The expression levels of cleaved caspase-3, autophagy marker light chain 3 (LC3) I/II, and AMPK/mTOR signaling pathway-related proteins were determined by Western blot. The changes of morphology and RFP-LC3 fluorescence were observed under microscopy.
RESULTS:
HG at 20, 40, 80 and 160 mmol/L dose-dependently induced cell apoptosis in MPC5 cells, whereas emodin (4 µ mol/L) significantly ameliorated HG-induced cell apoptosis and caspase-3 cleavage (P<0.01). Emodin (4 µ mol/L) significantly increased LC3-II protein expression levels and induced RFP-LC3-containing punctate structures in MPC5 cells (P<0.01). Furthermore, the protective effects of emodin were mimicked by rapamycin (100 nmol/L). Moreover, emodin increased the phosphorylation of AMPK and suppressed the phosphorylation of mTOR. The AMPK inhibitor compound C (10 µ mol/L) reversed emodin-induced autophagy activation.
CONCLUSION
Emodin ameliorated HG-induced apoptosis of MPC5 cells in vitro that involved induction of autophagy through the AMPK/mTOR signaling pathway, which might provide a potential therapeutic option for diabetic nephropathy.
Emodin/pharmacology*
;
AMP-Activated Protein Kinases/metabolism*
;
Podocytes
;
Caspase 3/metabolism*
;
TOR Serine-Threonine Kinases/metabolism*
;
Signal Transduction
;
Apoptosis
;
Sirolimus/pharmacology*
;
Glucose/metabolism*
;
Autophagy
10.Anti-depression mechanism of Zuojin Pills:based on UHPLC-TOF-MS, network pharmacology, and experimental verification.
Guo-Liang DAI ; Hua-Xi HANG ; Pei-Yao CHEN ; Sheng-Wei HONG ; Mei-Juan XU ; Cheng-Yao MA ; Qian HUANG ; Yu YE ; Mei-Shuang YU ; Wen-Zheng JU
China Journal of Chinese Materia Medica 2023;48(1):183-192
This study aims to explore the anti-depression mechanism of Zuojin Pills based on the plasma constituents, network pharmacology, and experimental verification. UHPLC-TOF-MS was used for qualitative analysis of Zuojin Pills-containing serum. Targets of the plasma constituents and the disease were retrieved from PharmMapper and GeneCards. Then the protein-protein interaction(PPI) network was constructed and core targets were screened for GO term enrichment and KEGG pathway enrichment. Cytoscape 3.7.2 was employed construct the &quot;compound-target-pathway&quot; network and the targets and signaling pathways of Zuojin Pills against depression were predicted. CUMS-induced depression mouse model was established to verify the key targets. The results showed that a total of 21 constituents migrating to blood of Zuojin Pills were identified, which were mainly alkaloids. A total of 155 common targets of the constituents and the disease and 67 core targets were screened out. KEGG enrichment and PPI network analysis showed that Zuojin Pills may play a role in the treatment of depression through AMPK/SIRT1, NLRP3, insulin and other targets and pathways. Furthermore, the results of animal experiments showed that Zuojin Pills could significantly improve the depression behaviors of depression, reduce the levels of IL-1β, IL-6 and TNF-α in hippocampus and serum, activate AMPK/SIRT1 signaling, and reduce the protein expression of NLRP3. In conclusion, Zuojin Pills may play a role in the treatment of depression by activating AMPK/SIRT1 signaling pathway, and inhibiting NLRP3 activation and neuroinflammation in the hippocampus of mice.
Animals
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Mice
;
Network Pharmacology
;
AMP-Activated Protein Kinases
;
Chromatography, High Pressure Liquid
;
NLR Family, Pyrin Domain-Containing 3 Protein
;
Sirtuin 1
;
Drugs, Chinese Herbal/pharmacology*
;
Molecular Docking Simulation

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