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Wang Z, Shi W, Wu L, Xiao Y, Wang M, Zhang S, Chen Z, Yin G, Xie X, Bi S, Liu S, Kong W, Zhou J. TMF inhibits extracellular matrix degradation by regulating the C/EBPβ/ADAMTS5 signaling pathway in osteoarthritis. Biomed Pharmacother 2024; 174:116501. [PMID: 38554527 DOI: 10.1016/j.biopha.2024.116501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Revised: 03/19/2024] [Accepted: 03/27/2024] [Indexed: 04/01/2024] Open
Abstract
Osteoarthritis (OA) is a chronic joint disease, characterized by degenerative destruction of articular cartilage. Chondrocytes, the unique cell type in cartilage, mediate the metabolism of extracellular matrix (ECM), which is mainly constituted by aggrecan and type II collagen. A disintegrin and metalloproteinase with thrombospondin 5 (ADAMTS5) is an aggrecanase responsible for the degradation of aggrecan in OA cartilage. CCAAT/enhancer binding protein β (C/EBPβ), a transcription factor in the C/EBP family, has been reported to mediate the expression of ADAMTS5. Our previous study showed that 5,7,3',4'-tetramethoxyflavone (TMF) could activate the Sirt1/FOXO3a signaling in OA chondrocytes. However, whether TMF protected against ECM degradation by down-regulating C/EBPβ expression was unknown. In this study, we found that aggrecan expression was down-regulated, and ADAMTS5 expression was up-regulated. Knockdown of C/EBPβ could up-regulate aggrecan expression and down-regulate ADAMTS5 expression in IL-1β-treated C28/I2 cells. TMF could compromise the effects of C/EBPβ on OA chondrocytes by activating the Sirt1/FOXO3a signaling. Conclusively, TMF exhibited protective activity against ECM degradation by mediating the Sirt1/FOXO3a/C/EBPβ pathway in OA chondrocytes.
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Affiliation(s)
- Zeyu Wang
- College of Rehabilitation, Gannan Medical University, Ganzhou 341000, China
| | - Weimei Shi
- College of Pharmacy, Gannan Medical University, Ganzhou 341000, China
| | - Longhuo Wu
- College of Pharmacy, Gannan Medical University, Ganzhou 341000, China
| | - Yaosheng Xiao
- Department of Orthopedics, First Affiliated Hospital of Gannan Medical University, Ganzhou 341000, China
| | - Miaofei Wang
- College of Pharmacy, Gannan Medical University, Ganzhou 341000, China
| | - Sainan Zhang
- College of Pharmacy, Gannan Medical University, Ganzhou 341000, China
| | - Zhixi Chen
- College of Pharmacy, Gannan Medical University, Ganzhou 341000, China
| | - Guoqiang Yin
- Ganzhou Hospital Affiliated to Nanchang University, Ganzhou 341000, China
| | - Xunlu Xie
- Department of Pathology, Ganzhou People's Hospital, Ganzhou 341000, China
| | - Shengrong Bi
- Department of Joint Surgery, Ganzhou People's Hospital, Ganzhou 341000, China
| | - Shiwei Liu
- Department of Joint Surgery, Ganzhou People's Hospital, Ganzhou 341000, China
| | - Weihao Kong
- Department of Joint Surgery, Ganzhou People's Hospital, Ganzhou 341000, China
| | - Jianguo Zhou
- Department of Joint Surgery, Ganzhou People's Hospital, Ganzhou 341000, China.
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Bendelin N, Gerdle B, Andersson G. Hurdles and potentials when implementing internet-delivered Acceptance and commitment therapy for chronic pain: a retrospective appraisal using the Quality implementation framework. Scand J Pain 2024; 24:sjpain-2022-0139. [PMID: 37855128 DOI: 10.1515/sjpain-2022-0139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Accepted: 09/14/2023] [Indexed: 10/20/2023]
Abstract
OBJECTIVES Internet-delivered psychological interventions can be regarded as evidence-based practices and have been implemented in psychiatric and somatic care at primary and specialist levels. However, challenges as low adherence and poor routinization, have arisen during attempts to implement internet-delivered interventions in chronic pain settings. Internet-delivered Acceptance and Commitment Therapy (IACT) has been found to be helpful for chronic pain patients and might aid in developing pain rehabilitation services. However, the integration of IACT into standard health care has not yet been described from an implementation science perspective. The aim of this hybrid 1 effectiveness-implementation study was to evaluate the process of implementing IACT in a pain rehabilitation setting, to guide future implementation initiatives. METHODS In this retrospective study we described actions taken during an implementation initiative, in which IACT was delivered as part of an interdisciplinary pain rehabilitation program (IPRP) at a specialist level clinic. All documents relevant to the study were reviewed and coded using the Quality Improvement Framework (QIF), focusing on adoption, appropriateness and sustainability. RESULTS The QIF-analysis of implementation actions resulted in two categories: facilitators and challenges for implementation. Sustainability may be facilitated by sensitivity to the changing needs of a clinical setting and challenged by unfitting capacity building. Appropriateness might be challenged by an insufficient needs assessment and facilitated by aligning routines for communication with the clinic's existing infrastructure. Adoption may be facilitated by staff key champions and an ability to adapt to occurring hurdles. Possible influential factors, hypotheses and key process challenges are presented in a logic model to guide future initiatives. CONCLUSIONS Sustainable implementation may depend on both the continuity of facilitating implementation actions and flexibility to the changing needs and interests of patients, caregivers and organization. We conclude that the use of theories, models and frameworks (TMF) as well as a logic model may ease design, planning and evaluation of an implementation process. Lastly, we suggest that IACT may be appropriate for IPRP when given before or after IPRP, focusing on psychiatric comorbidities.
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Affiliation(s)
- Nina Bendelin
- Pain and Rehabilitation Centre, Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
| | - Björn Gerdle
- Pain and Rehabilitation Centre, Department of Health, Medicine and Caring Sciences, Linköping University, Linköping, Sweden
| | - Gerhard Andersson
- Department of Behavioural Sciences and Learning, Linköping University, Linköping, Sweden
- Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
- Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden
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Tovar LR, Neves MC, Manhães BMR, Montanini G, Azevedo ADF, Lailson-Brito J, Bisi TL. Understanding trophic transference role in mercury biomagnification and bioaccumulation in the Atlantic spotted dolphin (Stenella frontalis). Chemosphere 2023; 338:139496. [PMID: 37451642 DOI: 10.1016/j.chemosphere.2023.139496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 07/11/2023] [Accepted: 07/12/2023] [Indexed: 07/18/2023]
Abstract
Mercury is a metal of toxicological importance that occurs naturally. However, its concentration can be affected by anthropogenic activities and has the potential to bioaccumulate and biomagnify in food webs. Thus, knowing how its concentration varies along the trophic levels allows us to understand its potential risks to the biota. The present study aimed to investigate mercury transfer through the Stenella frontalis food web in Ilha Grande Bay (IGB), Rio de Janeiro state, Brazil. Samples of muscle and liver of S. frontalis were obtained from carcasses (n = 8) found stranded in the IGB, and its potential prey species were collected in fishing landings in the same Bay (n = 145). Total mercury (THg) concentrations were determined by atomic absorption spectrometry, and the δ15N was determined by an isotope ratio mass spectrometer. To investigate how trophic transfer affects mercury contamination in biota, six linear models were applied between THg logarithmic concentrations and δ15N or trophic position (TP). The trophic magnification factor (TMF) was calculated from each model to estimate the trophic transfer. Mean THg concentration in S. frontalis was higher in the liver than in muscle, but no correlation was found with age and δ15N values. Instead, the hepatic and muscular THg concentrations positively correlated with the trophic position. In the summer, THg concentration, TP, and δ15N values in prey species varied significantly, as well as in the winter, except for THg concentration. All trophic transfer models were significant in both seasons, and the TMF >1. The present study showed that trophic transfer is an essential factor in mercury biomagnification in both seasons but is not the unique driver. Both δ15N and TP could explain mercury trophic transfer, but TP better integrates metabolic diversity and seasonality.
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Affiliation(s)
- Lucas Rodrigues Tovar
- Programa de Pós-Graduação em Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil; Laboratório de Mamíferos Aquáticos e Bioindicadores, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, 20550-013, Brazil.
| | - Mariana Cappello Neves
- Programa de Pós-Graduação em Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil; Laboratório de Mamíferos Aquáticos e Bioindicadores, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, 20550-013, Brazil
| | - Bárbara M R Manhães
- Programa de Pós-Graduação em Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil; Laboratório de Mamíferos Aquáticos e Bioindicadores, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, 20550-013, Brazil
| | - Gleici Montanini
- Laboratório de Mamíferos Aquáticos e Bioindicadores, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, 20550-013, Brazil
| | - Alexandre de Freitas Azevedo
- Programa de Pós-Graduação em Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil; Laboratório de Mamíferos Aquáticos e Bioindicadores, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, 20550-013, Brazil
| | - José Lailson-Brito
- Programa de Pós-Graduação em Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil; Laboratório de Mamíferos Aquáticos e Bioindicadores, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, 20550-013, Brazil
| | - Tatiana Lemos Bisi
- Programa de Pós-Graduação em Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil; Laboratório de Mamíferos Aquáticos e Bioindicadores, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro (UERJ), Rio de Janeiro, 20550-013, Brazil
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Aira A, Rubio E, Fehér C, González-Suárez B, Casals-Pascual C, Soriano Á. Stool donor recruitment - A one-year experience. Enferm Infecc Microbiol Clin (Engl Ed) 2022; 40:495-498. [PMID: 36336379 DOI: 10.1016/j.eimce.2021.01.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Accepted: 01/22/2021] [Indexed: 06/16/2023]
Abstract
Stool donors for fecal microbiota transference (FMT) should be rigorously screened to identify any disorder in health status. The success of our screening protocol to identify eligible donors in the last year and a half was evaluated and compared with the published literature. The target population was medical students who responded to 3 public calls to donate stools. Qualified donors brought stool samples to our lab. Out of the 110 students who responded to the call, 26 were enrolled as study donors and delivered at least one stool sample. The main reason for volunteer exclusion was body mass index (BMI) <18.5kg/m2 or >25kg/m2 (n=11) and for the identification of ESBL Escherichia coli in feces (n=3). Our success rate after the screening protocol was considered high. Understanding the incentives to participate is critical to the success of recruitment strategies as FMT is still a little-known practice for general population.
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Affiliation(s)
- Andrea Aira
- Department of Infectious Diseases, Hospital Clinic, Barcelona, Spain.
| | - Elisa Rubio
- Department of Clinical Microbiology, Hospital Clinic, Barcelona, Spain; Institute for Global Health, ISGlobal, Barcelona, Spain
| | - Csaba Fehér
- Department of Infectious Diseases, Hospital Clinic, Barcelona, Spain
| | - Begoña González-Suárez
- Digestive Endoscopy Unit, Department of Gastroenterology, Hospital Clinic, Barcelona, Spain
| | - Climent Casals-Pascual
- Department of Clinical Microbiology, Hospital Clinic, Barcelona, Spain; Institute for Global Health, ISGlobal, Barcelona, Spain
| | - Álex Soriano
- Department of Infectious Diseases, Hospital Clinic, IDIBAPS, Barcelona, Spain; University of Barcelona, Barcelona, Spain
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Palmer J, Jones J, Whittaker M, Williams S. Thermo-Mechanical Fatigue Crack Growth and Phase Angle Effects in Ti6246. Materials (Basel) 2022; 15:6264. [PMID: 36143582 PMCID: PMC9505152 DOI: 10.3390/ma15186264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 08/25/2022] [Accepted: 09/01/2022] [Indexed: 06/16/2023]
Abstract
A bespoke TMF crack growth test set-up has been developed and validated for use throughout this study and the effects of phasing between mechanical loading and temperature have been investigated. The study shows that TMF cycles may show increased crack growth rate behaviour when compared to isothermal fatigue. The phase angle of the applied TMF cycle can also affect crack growth behaviour, with in-phase (IP) test conditions showing faster crack growth rates than out-of-phase (OP) test conditions. Propagating cracks interact with the microstructure of the material, in particular, the α/β interfaces within the prior beta grains and supporting fractography evidences subtle differences in fracture mechanisms as a result of phase angle.
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Affiliation(s)
- Jennie Palmer
- Institute of Structural Materials, Swansea University Bay Campus, Crymlyn Burrows, Swansea SA1 8EN, UK
| | - Jonathan Jones
- Institute of Structural Materials, Swansea University Bay Campus, Crymlyn Burrows, Swansea SA1 8EN, UK
| | - Mark Whittaker
- Institute of Structural Materials, Swansea University Bay Campus, Crymlyn Burrows, Swansea SA1 8EN, UK
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Peng F, Huang X, Shi W, Xiao Y, Jin Q, Li L, Xu D, Wu L. 5,7,3',4'-tetramethoxyflavone ameliorates cholesterol dysregulation by mediating SIRT1/FOXO3a/ABCA1 signaling in osteoarthritis chondrocytes. Future Med Chem 2021; 13:2153-66. [PMID: 34608806 DOI: 10.4155/fmc-2021-0247] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Dyslipidemia has been associated with the development of osteoarthritis. Our previous study found that 5,7,3',4'-tetramethoxyflavone (TMF) exhibited protective activities against the pathological changes of osteoarthritis. Aim: To investigate the roles of TMF in regulating ABCA1-mediated cholesterol metabolism. Methods: Knockdown and overexpression were employed to study gene functions. Protein-protein interaction was investigated by co-immunoprecipitation, and the subcellular locations of proteins were studied by immunofluorescence. Results: IL-1β decreased ABCA1 expression and induced apoptosis. Therapeutically, TMF ameliorated the effects of IL-1β. FOXO3a knockdown expression abrogated the effects of TMF, and FOXO3a overexpression increased ABCA1 expression by interacting with LXRα. TMF promoted FOXO3a nuclear translocation by activating SIRT1 expression. Conclusions: TMF ameliorates cholesterol dysregulation by increasing the expression of FOXO3a/LXRα/ABCA1 signaling through SIRT1 in C28/I2 cells.
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Aira A, Rubio E, Fehér C, González-Suárez B, Casals-Pascual C, Soriano Á. Stool donor recruitment - A one-year experience. Enferm Infecc Microbiol Clin 2021; 40:S0213-005X(21)00044-6. [PMID: 33712265 DOI: 10.1016/j.eimc.2021.01.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/19/2021] [Accepted: 01/22/2021] [Indexed: 11/16/2022]
Abstract
Stool donors for fecal microbiota transference (FMT) should be rigorously screened to identify any disorder in health status. The success of our screening protocol to identify eligible donors in the last year and a half was evaluated and compared with the published literature. The target population was medical students who responded to 3 public calls to donate stools. Qualified donors brought stool samples to our lab. Out of the 110 students who responded to the call, 26 were enrolled as study donors and delivered at least one stool sample. The main reason for volunteer exclusion was body mass index (BMI) <18.5kg/m2 or >25kg/m2 (n=11) and for the identification of ESBL Escherichia coli in feces (n=3). Our success rate after the screening protocol was considered high. Understanding the incentives to participate is critical to the success of recruitment strategies as FMT is still a little-known practice for general population.
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Affiliation(s)
- Andrea Aira
- Department of Infectious Diseases, Hospital Clinic, Barcelona, Spain.
| | - Elisa Rubio
- Department of Clinical Microbiology, Hospital Clinic, Barcelona, Spain; Institute for Global Health, ISGlobal, Barcelona, Spain
| | - Csaba Fehér
- Department of Infectious Diseases, Hospital Clinic, Barcelona, Spain
| | - Begoña González-Suárez
- Digestive Endoscopy Unit, Department of Gastroenterology, Hospital Clinic, Barcelona, Spain
| | - Climent Casals-Pascual
- Department of Clinical Microbiology, Hospital Clinic, Barcelona, Spain; Institute for Global Health, ISGlobal, Barcelona, Spain
| | - Álex Soriano
- Department of Infectious Diseases, Hospital Clinic, IDIBAPS, Barcelona, Spain; University of Barcelona, Barcelona, Spain
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Panda SP, Panigrahy UP, Prasanth D, Gorla US, Guntupalli C, Panda DP, Jena BR. A trimethoxy flavonoid isolated from stem extract of Tabebuia chrysantha suppresses angiogenesis in angiosarcoma. J Pharm Pharmacol 2020; 72:990-999. [PMID: 32311118 DOI: 10.1111/jphp.13272] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 03/21/2020] [Indexed: 02/03/2023]
Abstract
OBJECTIVES This research aimed to evaluate the antiangiogenic activity of isolated flavonoid 4a,5,8,8a-tetrahydro-5-hydroxy-3,7,8-trimethoxy-2-(3,4-dimethoxyphenyl) chromen-4-one (TMF) from Tabebuia chrysantha. STAT3-MMP9 signalling is a signal transduction mechanism that promotes angiogenesis in various cancers. METHODS The tumour xenografting chicken embryo chorioallantoic membrane (CAM) model-based ex vivo assay was used to evaluate the activity of TMF. The Western blot, densitometric analysis and quantitative real-time polymerase chain reaction (qRT-PCR) were performed to evaluate the activity of the MMP9. Zebrafish embryos were used to evaluate embryotoxicity, and in vitro free radical scavenging activity of flavonoid was also elucidated. KEY FINDINGS This research assessed the high level of STAT3, p-ERK, VEGF-R and MMP9 in the tissue extract of the control group, and also, the suppression of angiogenesis in the treatment groups was due to scavenged ROS and RNS, dephosphorylation of STAT3 and ERK, and suppression of MMP9 gene expression. CONCLUSION The isolated flavonoid named TMF from T. chrysantha functions as specific regulators of target proteins of angiosarcoma. The STAT3-MMP9 signalling may be used as an effective prognostic marker of angiosarcoma.
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Affiliation(s)
- Siva Prasad Panda
- Pharmacology research division, College of Pharmacy, Koneru Lakshmaiah Education Foundation, Vaddeswaram, India
| | | | - Dsnbk Prasanth
- Pharmacology research division, College of Pharmacy, Koneru Lakshmaiah Education Foundation, Vaddeswaram, India
| | - Uma Sankar Gorla
- Pharmacology research division, College of Pharmacy, Koneru Lakshmaiah Education Foundation, Vaddeswaram, India
| | - Chakravarthi Guntupalli
- Pharmacology research division, College of Pharmacy, Koneru Lakshmaiah Education Foundation, Vaddeswaram, India
| | | | - Bikash Ranjan Jena
- Southern Institute of Medical Sciences (SIMS college of Pharmacy), Guntur, India
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Huang X, Chen Z, Shi W, Zhang R, Li L, Liu H, Wu L. TMF inhibits miR-29a/Wnt/β-catenin signaling through upregulating Foxo3a activity in osteoarthritis chondrocytes. Drug Des Devel Ther 2019; 13:2009-2019. [PMID: 31354246 PMCID: PMC6590397 DOI: 10.2147/dddt.s209694] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 05/24/2019] [Indexed: 12/13/2022]
Abstract
Background: miR-29a, a downstream factor of Wnt/β-catenin signaling, promotes the activity of the Wnt/β-catenin signaling in a positive feedback loop. Our previous work showed that 5,7,3ʹ,4ʹ-tetramethoxyflavone (TMF), a major constituent from Murraya exotica L., exhibited chondroprotective activity by inhibiting the activity of Wnt/β-catenin signaling. Purpose: To investigate whether TMF showed the inhibitory effects on miR-29a/β-catenin signaling by up regulation of Foxo3a expression. Methods: Rat knee OA models were duplicated by using Hulth’s method. TMF (5 μg/mL and 20 μg/mL) was used for administration to cultured cells, which were isolated from the rat cartilages. Analysis of chondrocytes apoptosis, gene expression, and protein expression were conducted. In addition, miR-29a mimics and pcDNA3.1(+)-Foxo3a vector were used for transfection, luciferase reporter assay for detecting the activity of Wnt/β-catenin signaling, and co-immunoprecipitation for determining proteins interaction. Results: TMF down regulated miR-29a/β-catenin signaling activity and cleaved caspase-3 expression and up regulated Foxo3a expression in OA rat cartilages. In vitro, miR-29a mimics down regulated the expression of Foxo3a and up regulated the activity of Wnt/β-catenin signaling and cleaved caspase-3 expression. TMF ameliorated miR-29a/β-catenin-induced chondrocytes apoptosis by up regulation of Foxo3a expression. Conclusion: TMF exhibited chondroprotective activity by up regulating Foxo3a expression and subsequently inhibiting miR-29a/Wnt/β-catenin signaling activity.
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Affiliation(s)
- Xianhua Huang
- College of Pharmacy, Gannan Medical University, Ganzhou, People's Republic of China
| | - Zhixi Chen
- College of Pharmacy, Gannan Medical University, Ganzhou, People's Republic of China
| | - Weimei Shi
- College of Pharmacy, Gannan Medical University, Ganzhou, People's Republic of China
| | - Rui Zhang
- College of Pharmacy, Gannan Medical University, Ganzhou, People's Republic of China
| | - Linfu Li
- College of Pharmacy, Gannan Medical University, Ganzhou, People's Republic of China
| | - Hai Liu
- College of Pharmacy, Gannan Medical University, Ganzhou, People's Republic of China
| | - Longhuo Wu
- College of Pharmacy, Gannan Medical University, Ganzhou, People's Republic of China
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Dyer A, Jones J, Cutts R, Whittaker M. The Effect of Phase Angle on the Thermo-Mechanical Fatigue Life of a Titanium Metal Matrix Composite. Materials (Basel) 2019; 12:E953. [PMID: 30909367 DOI: 10.3390/ma12060953] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 03/14/2019] [Accepted: 03/19/2019] [Indexed: 11/17/2022]
Abstract
The thermo-mechanical fatigue (TMF) behaviour of a Ti-6Al-4V matrix composite reinforced with SCS-6 silicon carbide fibres (140 μm longitudinal fibres, laid up hexagonally) has been investigated. In-phase and out-of-phase TMF cycles were utilized, cycling between 80⁻300 °C, with varying maximum stress. The microstructure and fracture surfaces were studied using electron backscatter diffraction (EBSD), energy-dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM), profilometry, and optical microscopy. The results have shown the damaging effect of out-of-phase cycling with crack initiation occurring earlier than in in-phase tests and crack propagation rates being accelerated in out-of-phase cycles. Fatigue crack initiation has been shown to be sensitive to crystallographic texture in the cladding material and thermo-mechanical fatigue test results can be considered according to a previously proposed conceptual framework for the interpretation of metal matrix composite fatigue.
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Wu L, Liu H, Li L, Xu D, Gao Y, Guan Y, Chen Q. 5,7,3',4'-Tetramethoxyflavone protects chondrocytes from ER stress-induced apoptosis through regulation of the IRE1α pathway. Connect Tissue Res 2018; 59:157-166. [PMID: 28436754 PMCID: PMC6104397 DOI: 10.1080/03008207.2017.1321639] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
AIM OF THE STUDY To investigate the roles of endoplasmic reticulum (ER) transmembrane sensor inositol-requiring enzyme-1 (IRE1)α signaling in ER stress-induced chondrocyte apoptosis, and to determine the molecular mechanisms underlying chondroprotective activity of 5,7,3',4'-tetramethoxyflavone (TMF) from Murraya exotica. MATERIALS AND METHODS IRE1α was knocked down by siRNA transfection in chondrocytes, which were harvested from rats' knee cartilages. Chondrocytes with IRE1α deficiency were administrated with tunicamycin (TM) and TMF. Chondrocyte apoptosis was quantified by flow cytometry and DAPI/TUNEL staining. Expression of mRNA and proteins was quantified by quantitative reverse transcription polymerase chain reaction (qRT-PCR) and western-blot, respectively. RESULTS IRE1α deficiency significantly increased the rate of TM-induced chondrocyte apoptosis, down-regulated the expression of pro-survival factors XBP1S and Bcl-2, and up-regulated pro-apoptotic factors CHOP, p-JNK, and caspase-3. TMF suppressed TM-induced chondrocyte apoptosis by activating the expression of IRE1α, which reversed the expression patterns of downstream pro-survival and pro-apoptotic factors due to IRE1α deficiency. CONCLUSION The mechanism of TMF in protecting chondrocytes against ER stress-induced apoptosis might be associated with regulating the activity of ER sensor IRE1α and its downstream pathway.
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Affiliation(s)
- Longhuo Wu
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI, USA;,College of Pharmacy, Gannan Medical University, Ganzhou, China
| | - Haiqing Liu
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI, USA;,College of Pharmacy, Gannan Medical University, Ganzhou, China
| | - Linfu Li
- College of Pharmacy, Gannan Medical University, Ganzhou, China
| | - Daohua Xu
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI, USA;,Department of Pharmacology, Guangdong Medical University, Dongguan, China
| | - Yun Gao
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI, USA
| | - Yingjie Guan
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI, USA
| | - Qian Chen
- Department of Orthopaedics, Warren Alpert Medical School of Brown University/Rhode Island Hospital, Providence, RI, USA
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Yuan X, Li L, Shi W, Liu H, Huang X, Liu Z, Wu L. TMF protects chondrocytes from ER stress-induced apoptosis by down-regulating GSK-3β. Biomed Pharmacother 2017; 89:1262-8. [PMID: 28320093 DOI: 10.1016/j.biopha.2017.03.028] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 02/18/2017] [Accepted: 03/09/2017] [Indexed: 11/20/2022] Open
Abstract
Endoplasmic reticulum (ER) stress-induced chondrocyte apoptosis plays a critical role in osteoarthritis cartilage degeneration. Previous studies showed that 5,7,3',4'-tetramethoxyflavone (TMF) exhibited chondroprotective activity through inhibiting PGE2-induced ER stress and down regulating the expression of GSK-3β. To further investigate the role of GSK-3β in ER stress-induced chondrocytes apoptosis and the protective role of TMF, GSK-3β siRNA and pcDNA3.1-myc-GSK-3β were employed to knock down and overexpress GSK-3β, respectively, in chondrocytes. Results showed that TM-induced ER stress significantly promoted chondrocytes apoptosis. These could be effectively reversed by GSK-3β deficiency, while GSK-3β overexpression significantly up regulated ER stress and increased chondrocytes apoptosis. In addition, TMF down regulated the expression of GSK-3β and inhibited ER stress-induced chondrocytes apoptosis. Collectively, TMF is a potential natural compound with chondroprotective property through inhibition of ER stress-induced apoptosis with down regulation of GSK-3β.
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Pretty CJ, Whitaker MT, Williams SJ. Thermo-Mechanical Fatigue Crack Growth of RR1000. Materials (Basel) 2017; 10:E34. [PMID: 28772394 DOI: 10.3390/ma10010034] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 12/08/2016] [Accepted: 12/26/2016] [Indexed: 11/17/2022]
Abstract
Non-isothermal conditions during flight cycles have long led to the requirement for thermo-mechanical fatigue (TMF) evaluation of aerospace materials. However, the increased temperatures within the gas turbine engine have meant that the requirements for TMF testing now extend to disc alloys along with blade materials. As such, fatigue crack growth rates are required to be evaluated under non-isothermal conditions along with the development of a detailed understanding of related failure mechanisms. In the current work, a TMF crack growth testing method has been developed utilising induction heating and direct current potential drop techniques for polycrystalline nickel-based superalloys, such as RR1000. Results have shown that in-phase (IP) testing produces accelerated crack growth rates compared with out-of-phase (OOP) due to increased temperature at peak stress and therefore increased time dependent crack growth. The ordering of the crack growth rates is supported by detailed fractographic analysis which shows intergranular crack growth in IP test specimens, and transgranular crack growth in 90° OOP and 180° OOP tests. Isothermal tests have also been carried out for comparison of crack growth rates at the point of peak stress in the TMF cycles.
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van den Brink NW, Arblaster JA, Bowman SR, Conder JM, Elliott JE, Johnson MS, Muir DCG, Natal-da-Luz T, Rattner BA, Sample BE, Shore RF. Use of terrestrial field studies in the derivation of bioaccumulation potential of chemicals. Integr Environ Assess Manag 2016; 12:135-145. [PMID: 26436822 DOI: 10.1002/ieam.1717] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 07/13/2015] [Accepted: 09/25/2015] [Indexed: 06/05/2023]
Abstract
Field-based studies are an essential component of research addressing the behavior of organic chemicals, and a unique line of evidence that can be used to assess bioaccumulation potential in chemical registration programs and aid in development of associated laboratory and modeling efforts. To aid scientific and regulatory discourse on the application of terrestrial field data in this manner, this article provides practical recommendations regarding the generation and interpretation of terrestrial field data. Currently, biota-to-soil-accumulation factors (BSAFs), biomagnification factors (BMFs), and bioaccumulation factors (BAFs) are the most suitable bioaccumulation metrics that are applicable to bioaccumulation assessment evaluations and able to be generated from terrestrial field studies with relatively low uncertainty. Biomagnification factors calculated from field-collected samples of terrestrial carnivores and their prey appear to be particularly robust indicators of bioaccumulation potential. The use of stable isotope ratios for quantification of trophic relationships in terrestrial ecosystems needs to be further developed to resolve uncertainties associated with the calculation of terrestrial trophic magnification factors (TMFs). Sampling efforts for terrestrial field studies should strive for efficiency, and advice on optimization of study sample sizes, practical considerations for obtaining samples, selection of tissues for analysis, and data interpretation is provided. Although there is still much to be learned regarding terrestrial bioaccumulation, these recommendations provide some initial guidance to the present application of terrestrial field data as a line of evidence in the assessment of chemical bioaccumulation potential and a resource to inform laboratory and modeling efforts.
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Affiliation(s)
| | | | - Sarah R Bowman
- Department of Evolution, Ecology and Organismal Biology, Ohio State University, Columbus, Ohio, USA
| | - Jason M Conder
- Geosyntec Consultants, Huntington Beach, California, USA
| | | | - Mark S Johnson
- US Army Public Health Center, Aberdeen Proving Ground, Aberdeen, Maryland
| | | | - Tiago Natal-da-Luz
- Department of Life Sciences, Centre for Functional Ecology, University of Coimbra, Coimbra, Portugal
| | - Barnett A Rattner
- Patuxent Wildlife Research Center, US Geological Survey, Beltsville, Maryland
| | | | - Richard F Shore
- NERC Centre for Ecology and Hydrology, Lancaster, United Kingdom
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Vorrink SU, Severson PL, Kulak MV, Futscher BW, Domann FE. Hypoxia perturbs aryl hydrocarbon receptor signaling and CYP1A1 expression induced by PCB 126 in human skin and liver-derived cell lines. Toxicol Appl Pharmacol 2014; 274:408-16. [PMID: 24355420 DOI: 10.1016/j.taap.2013.12.002] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 11/27/2013] [Accepted: 12/05/2013] [Indexed: 11/21/2022]
Abstract
The aryl hydrocarbon receptor (AhR) is an important mediator of toxic responses after exposure to xenobiotics including 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) and dioxin-like polychlorinated biphenyls (PCBs). Activation of AhR responsive genes requires AhR dimerization with the aryl hydrocarbon receptor nuclear translocator (ARNT), a heterodimeric partner also shared by the hypoxia-inducible factor-1α (HIF-1α) protein. TCDD-stimulated AhR transcriptional activity can be influenced by hypoxia; however, it less well known whether hypoxia interferes with AhR transcriptional transactivation in the context of PCB-mediated AhR activation in human cells. Elucidation of this interaction is important in liver hepatocytes which extensively metabolize ingested PCBs and experience varying degrees of oxygen tension during normal physiologic function. This study was designed to assess the effect of hypoxia on AhR transcriptional responses after exposure to 3,3',4,4',5-pentachlorobiphenyl (PCB 126). Exposure to 1% O2 prior to PCB 126 treatment significantly inhibited CYP1A1 mRNA and protein expression in human HepG2 and HaCaT cells. CYP1A1 transcriptional activation was significantly decreased upon PCB 126 stimulation under conditions of hypoxia. Additionally, hypoxia pre-treatment reduced PCB 126 induced AhR binding to CYP1 target gene promoters. Importantly, ARNT overexpression rescued cells from the inhibitory effect of hypoxia on XRE-luciferase reporter activity. Therefore, the mechanism of interference of the signaling crosstalk between the AhR and hypoxia pathways appears to be at least in part dependent on ARNT availability. Our results show that AhR activation and CYP1A1 expression induced by PCB 126 were significantly inhibited by hypoxia and hypoxia might therefore play an important role in PCB metabolism and toxicity.
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Key Words
- 2,2′,4,4′,5,5′-hexachlorobiphenyl
- 2,3,7,8-tetrachlorodibenzo-p-dioxin
- 3,3′,4,4′,5-pentachlorobiphenyl
- 6,2′,4′-trimethoxyflavone
- ARNT
- AhR
- CYP1A1
- ChIP
- DMSO
- EMSA
- HIF-1α
- HRE
- Hypoxia
- PCB
- PCB 126
- PCB 153
- RPLP0
- TCDD
- TMF
- XRE
- aryl hydrocarbon receptor
- aryl hydrocarbon receptor nuclear translocator
- bHLH/PAS
- basic helix-loop-helix/PER-ARNT-SIM
- chromatin immunoprecipitation
- cytochrome P450 1A1
- dimethyl sulfoxide
- electrophoretic mobility shift assay
- hypoxia response element
- hypoxia-inducible factor-1α
- polychlorinated biphenyl
- qRT-PCR
- quantitative real-time reverse transcription polymerase chain reaction
- ribosomal protein, large, P0
- xenobiotic response element
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