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2.
Chin J Nat Med ; 19(10): 750-757, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-34688465

RESUMO

Tripterygium wilfordii multiglycoside (GTW) is a commonly used compound for the treatment of rheumatoid arthritis (RA) and immune diseases in clinical practice. However, it can induce liver injury and the mechanism of hepatotoxicity is still not clear. This study was designed to investigate GTW-induced hepatotoxicity in zebrafish larvae and explore the mechanism involved. The 72 hpf (hours post fertilization) zebrafish larvae were administered with different concentrations of GTW for three days and their mortality, malformation rate, morphological changes in the liver, transaminase levels, and histopathological changes in the liver of zebrafish larvae were detected. The reverse transcription-polymerase chain reaction (RT-PCR) was used to examine the levels of microRNA-122 (miR-122) and genes related to inflammation, apoptosis, cell proliferation and liver function. The results showed that GTW increased the mortality of zebrafish larvae, while significant malformations and liver damage occurred. The main manifestations were elevated levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST), significant liver atrophy, vacuoles in liver tissue, sparse cytoplasm, and unclear hepatocyte contours. RT-PCR results showed that the expression of miR-122 significantly decreased by GTW; the mRNA levels of inflammation-related genes il1ß, il6, tnfα, il10, cox2 and ptges significantly increased; the mRNA level of tgfß significantly decreased; the mRNA levels of apoptosis-related genes, caspase-8 and caspase-9, significantly increased; the mRNA level of bcl2 significantly decreased; the mRNA levels of cell proliferation-related genes, top2α and uhrf1, significantly reduced; the mRNA levels of liver function-related genes, alr and cyp3c1, significantly increased; and the mRNA level of cyp3a65 significantly decreased. In zebrafish, GTW can cause increased inflammation, enhanced apoptosis, decreased cell proliferation, and abnormal expression of liver function-related genes, leading to abnormal liver structure and function and resulting in hepatotoxicity.

3.
Br J Pharmacol ; 2021 Sep 22.
Artigo em Inglês | MEDLINE | ID: mdl-34553378

RESUMO

BACKGROUND AND PURPOSE: Duchenne muscular dystrophy (DMD) is a degenerative muscle disease with no effective drug treatment. This study investigated the positive effects of fenofibrate on dystrophic muscles. EXPERIMENTAL APPROACH: Myostatin expression in serum and muscle tissue of DMD patients and mdx mice were tested. Primary myoblasts isolated from mdx mice were challenged with an inflammatory stimulus and treated with fenofibrate. In animal experiments, 6-week-old male mdx mice were treated with fenofibrate (100 mg/kg) administered orally once per day for 6 weeks. Tests of muscle function plus histology and biochemical analyses of serum were conducted to evaluate the effects of fenofibrate. The expressions of myostatin, MuRF1, and atrogin-1 in skeletal muscle were evaluated by Western blotting and real-time PCR. Total and oxidative myosin heavy chain (MHC) were assessed via immunofluorescence. KEY RESULTS: Increased expression of myostatin protein was found in dystrophic muscle of DMD patients and mdx mice. Fenofibrate enhanced myofibre differentiation by downregulating the expression of myostatin protein but not mRNA in primary myoblasts of mdx mice. Fenofibrate significantly improved muscle function while ameliorating muscle damage in mdx mice. These benefits are accompanied by an anti-inflammatory effect. Fenofibrate treatment returned myofibre function by inhibiting the expressions of myostatin, MuRF1, and atrogin-1 protein in the gastrocnemius muscle and diaphragm, while leaving the mRNA level of myostatin unaffected. CONCLUSIONS AND IMPLICATIONS: Fenofibrate substantially slows muscle dystrophy by promoting the degradation of myostatin protein, which may indicate a new therapeutic focus for DMD patients.

4.
J Ethnopharmacol ; 281: 114521, 2021 Dec 05.
Artigo em Inglês | MEDLINE | ID: mdl-34390794

RESUMO

ETHNOPHARMACOLOGICAL RELEVANCE: Zhuanggu Guanjie Pill (ZGGJP), a modern Chinese medicine formula, is composed of 12 herbs and has been used to treat osteoporosis in China for almost 30 years. However, no in vivo study of the influences of ZGGJP on the cytochrome P450 (CYP) activities have been reported. AIM OF THE STUDY: The aim of this study was to evaluate the effects of ZGGJP on the activities and the mRNA expression of CYP enzymes (CYP1A2, CYP2B6, CYP2C9, CYP2C19, CYP2D6, CYP2E1 and CYP3A) and their corresponding nuclear receptor levels in rats. MATERIALS AND METHODS: After 7 days oral treatment of ZGGJP at low- and high-dose, cocktail solution was given to rats. Blood samples were collected at series of time points. The plasma concentrations of probe drugs and their corresponding metabolites were determined by UPLC-MS/MS. The influence of ZGGJP on the activities of seven CYPs were evaluated the metabolic ratios (Cmax and AUC0-t) for metabolites/probe drugs. In addition, the effects of ZGGJP on the mRNA expression of CYPs and their corresponding nuclear receptors in rat liver were evaluated by real-time PCR. RESULTS: ZGGJP showed significant inductive effects on CYP1A2 and CYP2B6 of both male and female rats. The influence of ZGGJP on CYP2C9 and CYP3A showed gender difference. ZGGJP could induce the activities of CYP2C9 and CYP3A in female rats, but have no influence on the activities in male rats. ZGGJP had no effects on CYP2D6, CYP2C19 and CYP2E1. The mRNA expression results of CYPs were in accordance with the pharmacokinetic results. The mRNA expression levels of constitutive androstane receptor (CAR) and vitamin D receptor (VDR) were increased significantly in female rats at high dosage, but no significant changes were observed in male rats. CONCLUSION: ZGGJP had inductive effects on CYP1A2 and CYP2B6 in both male and female rats. The results showed that ZGGJP could induce the activities of CYP2C9 and CYP3A in female rats, but had no effect in male rats. This may suggest that the influence of ZGGJP on CYP2C9 and CYP3A exhibit gender difference. The inductive effects of ZGGJP on the activities of CYPs, exhibiting gender difference, may be regulated by CAR and VDR. Therefore, co-administration of ZGGJP with other drugs, especially using CYP2C9 and CYP3A substrates in females, may need dose adjustment to avoid herb-drug interaction.

5.
Eur J Med Chem ; 225: 113807, 2021 Dec 05.
Artigo em Inglês | MEDLINE | ID: mdl-34455359

RESUMO

The peroxisome proliferator-activated receptors (PPARs) exert vital function in the regulation of energy metabolism, which were considered as promising targets of metabolic syndrome. Until now, PPARδ/γ dual agonist is rarely reported, and thereby the pharmacologic action of PPARδ/γ dual agonist is still unclear. In this study, we identified a dual PPARδ/γ partial agonist 6 (ZLY06) based on the cyclization strategy of PPARα/δ dual agonist GFT505. ZLY06 revealed excellent pharmacokinetic profiles suitable for oral medication. Moreover, ZLY06 markedly improved glucolipid metabolism without weight gain, and alleviated fatty liver by promoting the ß-oxidation of fatty acid and inhibiting hepatic lipogenesis. In contrast, weight gain and hepatic steatosis were observed in Rosiglitazone, a widely used PPARγ full agonist. All of these results indicated that ZLY06 exhibits potential benefits on metabolic syndrome, while no adverse effects related to PPARγ full agonist.

6.
Org Lett ; 23(15): 5719-5723, 2021 08 06.
Artigo em Inglês | MEDLINE | ID: mdl-34286981

RESUMO

A rhodium(III)-catalyzed C-H allylation of (hetero)arenes by using 2-methylidenetrimethylene carbonate as an efficient allylic source has been developed for the first time. Five different directing groups including oxime, N-nitroso, purine, pyridine, and pyrimidine were compatible, delivering various branched allylarenes bearing an allylic hydroxyl group in moderate to excellent yields.

7.
Life Sci ; 282: 119807, 2021 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-34245771

RESUMO

AIM: This study was designed to investigate the changes of liver injury and Nrf2 signaling pathway in the process of sepsis. We also aimed to examine the role of Nrf2 in resisting oxidative stress and relieving inflammation in sepsis-induced hepatic injury. MAIN METHODS: By operating cecal ligation and puncture (CLP) on Nrf2-/- mice and wild type mice, a sepsis-induced hepatic injury model was established. We compared and contrasted the wild type mice with the Nrf2-/- mice during sepsis-induced hepatic injury, and evaluated the liver damage by biochemical analyses and staining hematoxylin-eosin (HE). Western blot or real-time PCR was performed to detect Nrf2 and its regulated genes NQO-1, GCLM and HO-1. Additionally, we detected the expressions and secretion of pro-inflammatory cytokines such as tumor necrosis factor-α (TNF-α), Interleukin-6 (IL-6), IL-1ß and anti-inflammatory cytokines IL-10. We assessed the oxidative stress through the levels of MDA and NO. KEY FINDINGS: The results showed that Nrf2 expressions at mRNA and protein levels were increased 1 day after CLP, namely the early stage of sepsis. Compared with wild type mice after CLP, Nrf2-/- mice showed more severe liver injury, accompanied by higher expression of inflammatory cytokines and oxidative stress. Notably, Nrf2-regulated genes GCLM and NQO-1, were strongly downregulated in Nrf2-/- mice. SIGNIFICANCE: Nrf2 was probably implicated in decreasing inflammatory cytokine levels and counteracting oxidative stress to alleviate sepsis-induced hepatic injury, mainly through regulating GCLM and NQO-1 in the early stage after CLP.


Assuntos
Regulação da Expressão Gênica , Hepatopatias/prevenção & controle , Fígado , Fator 2 Relacionado a NF-E2/biossíntese , Estresse Oxidativo , Sepse/metabolismo , Animais , Fígado/lesões , Fígado/metabolismo , Hepatopatias/etiologia , Hepatopatias/genética , Hepatopatias/metabolismo , Camundongos , Camundongos Knockout , Fator 2 Relacionado a NF-E2/genética , Sepse/complicações , Sepse/genética
8.
Artigo em Inglês | MEDLINE | ID: mdl-34052562

RESUMO

Huang-Lian-Jie-Du Decoction (HLJDD), a well-known traditional Chinese formulation, has been proved to exert neuroprotective effects, however, the bioactive components in HLJDD still remain to be elucidated. In the present study, a rapid and effective method involving live cell biospecific extraction and HPLC-Q-Orbitrap HRMS/MS was utilized to rapidly screen and identify the neuroprotective compounds from the HLJDD crude extract directly. Firstly, sixteen principal components in HLJDD crude extract were identified by HPLC-Q-Orbitrap HRMS/MS analysis. After co-incubation with PC12 cells, which have been validated as the key target cells for neurodegenerative diseases, seven compounds of them were demonstrated to exhibit binding affinity to the target cells. Furthermore, three representative compounds named baicalin, wogonoside, and berberine were subsequently verified to exert cytoprotective effects on PC12 cells injured by hydrogen peroxide via inhibiting oxidative stress and cell apoptosis, indicating that these screened compounds may possess a potential for the treatment of neurodegenerative diseases and were responsible, in part at least, for the neuroprotective beneficial effects of HLJDD. Taken together, our study provides evidence that live cell biospecific extraction coupled with LC-HRMS/MS technique is an efficient method for rapid screening potential bioactive components in traditional Chinese medicines.


Assuntos
Cromatografia Líquida de Alta Pressão/métodos , Técnicas Citológicas/métodos , Medicamentos de Ervas Chinesas , Fármacos Neuroprotetores , Animais , Sobrevivência Celular/efeitos dos fármacos , Medicamentos de Ervas Chinesas/análise , Medicamentos de Ervas Chinesas/farmacologia , Fármacos Neuroprotetores/análise , Fármacos Neuroprotetores/farmacologia , Células PC12 , Ratos , Espectrometria de Massas em Tandem
9.
Food Chem Toxicol ; 153: 112244, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-33930484

RESUMO

Methylglyoxal (MGO), a cytotoxic byproduct of glycolysis in biological systems, can induce endothelial cells dysfunction, implicated in diabetic vascular complications. Pterostilbene (PTS), a naturally occurring resveratrol derivative, is involved in various pharmacological activities. This study aimed to explore the effects of PTS on MGO induced cytotoxicity in human umbilical vein endothelial cells (HUVECs) and the underlying mechanisms for the first time. In the current study, it has been demonstrated that PTS could enhance the level of glyoxalase 1 (GLO-1) and elevate glutathione (GSH) content to active the glyoxalase system, resulting in elimination of the toxic MGO as well as advanced glycation end products (AGEs) in HUVECs. Meanwhile, PTS could also suppress oxidative stress and thus exert cytoprotective effects by elevating Nrf2 nuclear translocation and the corresponding down-stream antioxidant enzymes in MGO induced HUVECs. In addition, PTS could alleviate MGO induced apoptosis in HUVECs via inhibition of oxidative stress and associated downstream mitochondria-dependent signaling apoptotic cascades, as characterized by preventing caspases family activation. Taken together, these findings suggest that PTS could protect against MGO induced endothelial cell cytotoxicity by regulating glyoxalase, oxidative stress and apoptosis, suggesting that PTS could be beneficial in the treatment of diabetic vascular complications.


Assuntos
Apoptose/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Lactoilglutationa Liase/metabolismo , Estresse Oxidativo/efeitos dos fármacos , Aldeído Pirúvico/toxicidade , Estilbenos/farmacologia , Regulação Enzimológica da Expressão Gênica/efeitos dos fármacos , Células Endoteliais da Veia Umbilical Humana/efeitos dos fármacos , Humanos , Lactoilglutationa Liase/genética , Espécies Reativas de Oxigênio
10.
Chin J Nat Med ; 19(3): 188-194, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33781452

RESUMO

Triptolide (TP), an active component of Tripterygium wilfordiiHook. f. (TWHF), has been widely used for centuries as a traditional Chinese medicine. However, the clinical application of TP has been restricted due to multitarget toxicity, such as hepatotoxicity. In this study, 28 days of oral TP administration (100, 200, or 400 µg·kg-1·d-1) induced the occurrence of cholestasis in female Wistar rats, as evidenced by increased serum levels of γ-glutamyl transpeptidase (γ-GGT), alkaline phosphatase (ALP) and hepatic total bile acids (TBAs). In addition, the heptocyte polarity associated with the strcture of tight junctions (TJs) was disrupted in both rats and sandwich-cultured primary hepatocytes. Immunoblotting revealed decreased expression of the TJ-associated proteins occludin, claudin-1, and zonula occludens protein (ZO-1), and downregulated mRNA levels of these TJs was also detected by real-time PCR. An immunofluorescence analysis showed abnormal subcellular localization of occludin, claudin-1 and ZO-1, which was also confirmed by transmission electron microscopy. Moreover, the concentration of FITC-dextran, a marker of paracellular penetration, was found to increase rapidly in bile increased rapidly (within 6 minutes) after treatment with TP, which indicated the functional impairment of TJs. Taken together, these results suggest that the administration of TP for 28 consecutive days to rats could induce cholestatic injury in the liver, and the increased paracellular permeability might play an important role in these pathological changes.


Assuntos
Colestase , Diterpenos/efeitos adversos , Fígado/efeitos dos fármacos , Fenantrenos/efeitos adversos , Junções Íntimas , Animais , Colestase/induzido quimicamente , Claudina-1 , Compostos de Epóxi/efeitos adversos , Feminino , Hepatócitos/efeitos dos fármacos , Ocludina , Ratos , Ratos Wistar , Junções Íntimas/patologia , Proteína da Zônula de Oclusão-1
11.
Acta Pharm Sin B ; 11(3): 708-726, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33777677

RESUMO

Ischemic stroke is the second leading cause of death worldwide with limited medications and neuroinflammation was recognized as a critical player in the progression of stroke, but how to control the overactive neuroinflammation is still a long-standing challenge. Here, we designed a novel SIRT6 activator MDL-811 which remarkably inhibited inflammatory response in lipopolysaccharide (LPS)-stimulated RAW264.7 macrophages and primary mouse microglia, which were abolished by silencing SIRT6. RNA-seq screening identified the forkhead box C1 (Foxc1) is a key gene evoked by MDL-811 stimulation and is required for the anti-inflammatory effects of MDL-811. We found MDL-811-activated SIRT6 directly interacted with enhancer of zeste homolog 2 (EZH2) and promoted deacetylation of EZH2 which could bind to the promoter of Foxc1 and upregulate its expression to modulate inflammation. Moreover, our data demonstrated that MDL-811 not only ameliorated sickness behaviors in neuroinflammatory mice induced by LPS, but also markedly reduced the brain injury in ischemic stroke mice in addition to promoting long-term functional recovery. Importantly, MDL-811 also exhibited strong anti-inflammatory effects in human monocytes isolated from ischemic stroke patients, underlying an interesting translational perspective. Taken together, MDL-811 could be an alternative therapeutic candidate for ischemic stroke and other brain disorders associated with neuroinflammation.

12.
Zhongguo Zhong Yao Za Zhi ; 46(1): 139-145, 2021 Jan.
Artigo em Chinês | MEDLINE | ID: mdl-33645063

RESUMO

Polygonum multiflorum is a traditional Chinese herbal medicine and has many biological activities such as hair-blacking, anti-atherosclerosis, anti-inflammatory and anti-aging. However, the liver injury induced by P. multiflorum has aroused wide attention in recent years. 2,3,5,4'-tetrahydroxystibane-2-O-ß-D-glucoside(TSG) is a main component of P. multiflorum, but the role of TSG in inducing liver injury is unclear. The aim of present study was to evaluate TSG's potential liver injury and effects on bile acid homeostasis and phospholipids efflux. C57 BL/6 J mice received intraperitoneal administration of 400 mg·kg~(-1) of TSG daily for 15 days, and then biochemical indexes of liver injury and changes of phospholipid content were detected. The changes of bile acid compositions were detected by LC-MS/MS. The results showed TSG 400 mg·kg~(-1) significantly increased the content of serum total bile acid(TBA) and alkaline phosphatase(ALP). Elevated free bile acid levels were observed in TSG-treated groups, including ß-muricholic acid(ß-MCA), ursodeoxycholic acid(UDCA), hyodeoxycholic acid(HDCA), chenodeoxycholic acid(CDCA), deoxcholic acid(DCA) in serum and ß-MCA, CDCA in liver. TSG inhibited the protein expression of farnesoid X receptor(FXR) and down stream bile salt export pump(BSEP), which may result in the accumulation of bile acid. TSG also inhibited the expression of 25-hydroxycholesterol-7 alpha-hydroxylase(CYP7 B1), which may disturb the alternative pathway for bile acid synthesis. In addition, intraperitoneal injection of TSG 400 mg·kg~(-1) significantly decreased the content of phospholipids in bile. The research showed that TSG significantly inhibited the expression of multidrug resistance protein 2(MDR2) and destroyed the regular distribution of MDR2 on the bile duct membrane of liver. In vitro results showed that the IC_(50) of TSG on HepG2 cells was about 1 500 µmol·L~(-1) and TSG at 500 µmol·L~(-1)(for 24 h) could destroy the distribution of MDR2 on the bile duct membrane of liver. In conclusion, TSG induced liver injury by disrupting bile acid homeostasis and phospholipids efflux.


Assuntos
Ácidos e Sais Biliares , Glucosídeos , Animais , Cromatografia Líquida , Homeostase , Fígado , Camundongos , Fosfolipídeos , Espectrometria de Massas em Tandem
13.
Biomed Chromatogr ; 35(7): e5093, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-33634891

RESUMO

A rapid and specific UPLC-MS/MS method with a total run time of 3.5 min was developed for the determination of pravastatin, fexofenadine, rosuvastatin, and methotrexate in rat primary hepatocytes. After protein precipitation with 70% acetonitrile (containing 30% H2 O), these four analytes were separated under gradient conditions with a mobile phase consisting of 0.03% acetic acid (v/v) and methanol at a flow rate of 0.50 mL/min. The linearity, recovery, matrix effect, accuracy, precision, and stability of the method were well validated. We evaluated drug-drug interactions based on these four compounds in freshly suspended hepatocytes. The hepatic uptake of pravastatin, fexofenadine, rosuvastatin, and methotrexate at 4°C was significantly lower than that at 37°C, and the hepatocytes were saturable with increased substrate concentration and culture time, suggesting that the rat primary hepatocyte model was successfully established. Triptolide showed a significant inhibitory effect on the hepatic uptake of these four compounds. In conclusion, this method was successfully employed for the quantification of pravastatin, fexofenadine, rosuvastatin, and methotrexate and was used to verify the rat primary hepatocyte model for Oatp1, Oatp2, Oatp4, and Oat2 transporter studies. Then, we applied this model to explore the effect of triptolide on these four transporters.


Assuntos
Hepatócitos/metabolismo , Metotrexato , Pravastatina , Rosuvastatina Cálcica , Terfenadina/análogos & derivados , Animais , Células Cultivadas , Cromatografia Líquida de Alta Pressão/métodos , Diterpenos/análise , Diterpenos/farmacocinética , Interações Medicamentosas , Compostos de Epóxi/análise , Compostos de Epóxi/farmacocinética , Modelos Lineares , Masculino , Metotrexato/análise , Metotrexato/farmacocinética , Fenantrenos/análise , Fenantrenos/farmacocinética , Pravastatina/análise , Pravastatina/farmacocinética , Ratos Wistar , Reprodutibilidade dos Testes , Rosuvastatina Cálcica/análise , Rosuvastatina Cálcica/farmacocinética , Sensibilidade e Especificidade , Espectrometria de Massas em Tandem/métodos , Terfenadina/análise , Terfenadina/farmacocinética
14.
Nat Commun ; 12(1): 1306, 2021 Feb 26.
Artigo em Inglês | MEDLINE | ID: mdl-33637763

RESUMO

Ferroelectric topological objects provide a fertile ground for exploring emerging physical properties that could potentially be utilized in future nanoelectronic devices. Here, we demonstrate quasi-one-dimensional metallic high conduction channels associated with the topological cores of quadrant vortex domain and center domain (monopole-like) states confined in high quality BiFeO3 nanoislands, abbreviated as the vortex core and the center core. We unveil via the phase-field simulation that the superfine metallic conduction channels along the center cores arise from the screening charge carriers confined at the core region, whereas the high conductance of vortex cores results from a field-induced twisted state. These conducting channels can be reversibly created and deleted by manipulating the two topological states via electric field, leading to an apparent electroresistance effect with an on/off ratio higher than 103. These results open up the possibility of utilizing these functional one-dimensional topological objects in high-density nanoelectronic devices, e.g. nonvolatile memory.

15.
Int Immunopharmacol ; 93: 107420, 2021 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-33540245

RESUMO

Cyclosporine A(CsA), a classic immunosuppressant, is mainly applied for solid organ transplantation and some autoimmune diseases by suppressing T lymphocytes. Early studies showed that the application of CsA is primarily focused on chronic but not acute inflammation, nevertheless, increasing evidence supporting a role for CsA in acute inflammation, although most of proofs come from experimental models. It has long been known to us that the nuclear factor of activated T cells (NFAT) is the target of CsA to regulate T lymphocytes. However, NFAT also contributes to the regulation of innate immune cells, thus, CsA can not only target lymphocytes but also innate immune cells such as monocytes/macrophages, dendritic cells and neutrophils, which provides a basis for CsA to act on acute inflammation. Moreover, some other pathophysiological events in acute inflammation such as decreased vascular activity, mitochondrial dysfunction and endogenous cell apoptosis can also be alleviated by CsA. There being a moderate successes in the application of CsA for experimental acute inflammation such as sepsis, trauma/hemorrhagic shock and ischemic/reperfusion injury, yet data of the clinical treatment is not clear. In this review, we will critically analyze the existing hypotheses, summarize the application of CsA and its possible mechanisms in various acute inflammation over the past few decades, hope to provide some clues for the clinical treatment of acute inflammation.


Assuntos
Ciclosporina/uso terapêutico , Imunossupressores/uso terapêutico , Inflamação/tratamento farmacológico , Traumatismo por Reperfusão/tratamento farmacológico , Sepse/tratamento farmacológico , Linfócitos T/imunologia , Ferimentos e Lesões/tratamento farmacológico , Doença Aguda , Animais , Humanos , Imunomodulação , Transplante de Órgãos
16.
Cell Biol Toxicol ; 37(4): 595-609, 2021 08.
Artigo em Inglês | MEDLINE | ID: mdl-33400020

RESUMO

Cholestatic liver injury, a group of diseases characterized with dysregulated bile acid (BA) homeostasis, was partly resulted from BA circulation disorders, which is commonly associated with the damage of hepatocyte barrier function. However, the underlying hepatocyte barrier-protective molecular mechanisms of cholestatic liver injury remain poorly understood. Interestingly, recent studies have shown that sphingosine-1-phosphate (S1P) participated in the process of cholestasis by activating its G protein-coupled receptors S1PRs, regaining the integrity of hepatocyte tight junctions (TJs). Here, we showed that SEW2871, a selective agonist of sphingosine-1-phosphate receptor 1(S1PR1), alleviated ANIT-induced TJs damage in 3D-cultured mice primary hepatocytes. Molecular mechanism studies indicated that AMPK signaling pathways was involved in TJs protection of SEW2871 in ANIT-induced hepatobiliary barrier function deficiency. AMPK antagonist compound C (CC) and agonist AICAR were all used to further identify the important role of AMPK signaling pathway in SEW2871's TJs protection of ANIT-treated mice primary hepatocytes. The in vivo data showed that SEW2871 ameliorated ANIT-induced cholestatic hepatotoxicity. Further protection mechanism research demonstrated that SEW2871 not only regained hepatocyte TJs by the upregulated S1PR1 via AMPK signaling pathway, but also recovered hepatobiliary barrier function deficiency, which was verified by the restored BA homeostasis by using of high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS). These results revealed that the increased expression of S1PR1 induced by SEW2871 could ameliorate ANIT-induced cholestatic liver injury through improving liver barrier function via AMPK signaling and subsequently reversed the disrupted BA homeostasis. Our study provided strong evidence that S1PR1 may be a promising therapeutic approach for treating intrahepatic cholestatic liver injury. Graphical abstract.

17.
Int Immunopharmacol ; 92: 107328, 2021 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-33412394

RESUMO

Cholestasis is one of the most common clinical symptom of liver diseases. If patients do not receive effective treatment, cholestasis can evolve into liver fibrosis, cirrhosis and ultimately liver failure requiring liver transplantation. Currently, only ursodeoxycholic acid, obeticholic acid and bezafibrate are FDA-approved drugs, thereby requiring a breakthrough in new mechanisms and therapeutic development. Inflammation is one of the common complications of cholestasis. Hepatic accumulation of toxic hydrophobic bile acids is a highly immunogenic process involving both resident and immigrating immune cells. And the resulting inflammation may further aggravate hepatocyte injury. Though, great investigations have been made in the immune responses during cholestasis, the relationship between immune responses and cholestasis remains unclear. Moreover, scarce reviews summarize the immune responses during cholestasis and the efficacy of therapies on immune response. The main purpose of this paper is to review the existing literature on dysfunctional immune response during cholestasis and the effect of treatment on immune response which may provide an insight for researchers and drug development.


Assuntos
Colestase/patologia , Imunidade/imunologia , Inflamação/imunologia , Animais , Colestase/imunologia , Colestase/metabolismo , Humanos , Inflamação/patologia
18.
Chromatographia ; : 1-8, 2021 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-33487663

RESUMO

A rapid and sensitive UPLC-MS/MS method was developed and fully validated for the quantification of hyperoside in rat plasma after intragastric, intraperitoneal and intravenous administration. Geniposide was used as an internal standard, and simple liquid-liquid extraction by ethyl acetate was utilized for to extracting the analytes from the rat plasma samples. Chromatographic separation was carried out on an InfinityLab Poroshell 120EC-C18column (2.1 mm × 50 mm, 1.9-Micro, Agilent technologies, USA). The mobile phase consisted of methanol (A) and water (B) (containing 0.1% acetic acid) at a flow rate of 0.4 mL/min. A run time of 3 min for each sample made it possible to analyze more than 300 plasma samples per day. The validated linear ranges of hyperoside were 2-1000 ng/mL in rat plasma. The intra-day and inter-day precision were within 2.6-9.3%, and accuracy were ± 8.6%. And the results of recovery and matrix interference studies were well within the accepted variability limits. Finally, this method was fully validated and successfully applied to the pharmacokinetic studies of hyperoside via different administration routes in rats.

19.
Acta Pharmacol Sin ; 42(7): 1080-1089, 2021 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32939036

RESUMO

Duchenne muscular dystrophy (DMD) is a progressive neuromuscular disease caused by a mutation in the gene encoding the dystrophin protein. Catalpol is an iridoid glycoside found in Chinese herbs with anti-inflammatory, anti-oxidant, anti-apoptotic, and hypoglycemic activities that can protect against muscle wasting. In the present study we investigated the effects of catalpol on DMD. Aged Dystrophin-deficient (mdx) mice (12 months old) were treated with catalpol (100, 200 mg·kg-1·d-1, ig) for 6 weeks. At the end of the experiment, the mice were sacrificed, and gastrocnemius (GAS), tibialis anterior (TA), extensor digitorum longus (EDL), soleus (SOL) muscles were collected. We found that catalpol administration dose-dependently increased stride length and decreased stride width in Gait test. Wire grip test showed that the time of wire grip and grip strength were increased. We found that catalpol administration dose-dependently alleviated skeletal muscle damage, evidenced by reduced plasma CK and LDH activity as well as increased the weight of skeletal muscles. Catalpol administration had no effect on dystrophin expression, but exerted anti-inflammatory effects. Furthermore, catalpol administration dose-dependently decreased tibialis anterior (TA) muscle fibrosis, and inhibited the expression of TGF-ß1, TAK1 and α-SMA. In primary myoblasts from mdx mice, knockdown of TAK1 abolished the inhibitory effects of catalpol on the expression levels of TGF-ß1 and α-SMA. In conclusion, catalpol can restore skeletal muscle strength and alleviate skeletal muscle damage in aged mdx mice, thus may provide a novel therapy for DMD. Catalpol attenuates muscle fibrosis by inhibiting the TGF-ß1/TAK1 signaling pathway.

20.
J Cachexia Sarcopenia Muscle ; 12(1): 192-208, 2021 02.
Artigo em Inglês | MEDLINE | ID: mdl-33236534

RESUMO

BACKGROUND: Transforming growth factor-ß-activated kinase 1 (TAK1) plays a key role in regulating fibroblast and myoblast proliferation and differentiation. However, the TAK1 changes associated with Duchenne muscular dystrophy (DMD) are poorly understood, and it remains unclear how TAK1 regulation could be exploited to aid the treatment of this disease. METHODS: Muscle biopsies were obtained from control donors or DMD patients for diagnosis (n = 6 per group, male, 2-3 years, respectively). Protein expression of phosphorylated TAK1 was measured by western blot and immunofluorescence analysis. In vivo overexpression of TAK1 was performed in skeletal muscle to assess whether TAK1 is sufficient to induce or aggravate atrophy and fibrosis. To explore whether TAK1 inhibition protects against muscle damage, mdx (loss of dystrophin) mice were treated with adeno-associated virus (AAV)-short hairpin TAK1 (shTAK1) or NG25 (a TAK1 inhibitor). Serum analysis, skeletal muscle performance and histology, muscle contractile function, and gene and protein expression were performed. RESULTS: We found that TAK1 was activated in the dystrophic muscles of DMD patients (n = 6, +72.2%, P < 0.001), resulting in fibrosis ( +65.9% for fibronectin expression, P < 0.001) and loss of muscle fibres (-32.5%, P < 0.01). Moreover, TAK1 was activated by interleukin-1ß, tumour necrosis factor-α, and transforming growth factor-ß1 (P < 0.01). Overexpression of TAK1 by AAV vectors further aggravated fibrosis (n = 8, +39.6% for hydroxyproline content, P < 0.01) and exacerbated muscle wasting (-31.6%, P < 0.01) in mdx mice; however, these effects were reversed in mdx mice by treatment with AAV-short hairpin TAK1 (shTAK1) or NG25 (a TAK1 inhibitor). The molecular mechanism underlying these effects may be related to the prevention of TAK1-mediated transdifferentiation of myoblasts into fibroblasts, thereby reducing fibrosis and increasing myoblast differentiation. CONCLUSIONS: Our findings show that TAK1 activation exacerbated fibrosis and muscle degeneration and that TAK1 inhibition can improve whole-body muscle quality and the function of dystrophic skeletal muscle. Thus, TAK1 inhibition may constitute a novel therapy for DMD.

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