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Wang J, Yu H, Li X, Li F, Chen H, Zhang X, Wang Y, Xu R, Gao F, Wang J, Liu P, Shi Y, Qin D, Li Y, Liu S, Ding S, Gao XY, Wang ZH. A TrkB cleavage fragment in hippocampus promotes Depressive-Like behavior in mice. Brain Behav Immun 2024; 119:56-83. [PMID: 38555992 DOI: 10.1016/j.bbi.2024.03.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 03/06/2024] [Accepted: 03/28/2024] [Indexed: 04/02/2024] Open
Abstract
Decreased hippocampal tropomyosin receptor kinase B (TrkB) level is implicated in the pathophysiology of stress-induced mood disorder and cognitive decline. However, how TrkB is modified and mediates behavioral responses to chronic stress remains largely unknown. Here the effects and mechanisms of TrkB cleavage by asparagine endopeptidase (AEP) were examined on a preclinical murine model of chronic restraint stress (CRS)-induced depression. CRS activated IL-1β-C/EBPβ-AEP pathway in mice hippocampus, accompanied by elevated TrkB 1-486 fragment generated by AEP. Specifi.c overexpression or suppression of AEP-TrkB axis in hippocampal CaMKIIα-positive cells aggravated or relieved depressive-like behaviors, respectively. Mechanistically, in addition to facilitating AMPARs internalization, TrkB 1-486 interacted with peroxisome proliferator-activated receptor-δ (PPAR-δ) and sequestered it in cytoplasm, repressing PPAR-δ-mediated transactivation and mitochondrial function. Moreover, co-administration of 7,8-dihydroxyflavone and a peptide disrupting the binding of TrkB 1-486 with PPAR-δ attenuated depression-like symptoms not only in CRS animals, but also in Alzheimer's disease and aged mice. These findings reveal a novel role for TrkB cleavage in promoting depressive-like phenotype.
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Affiliation(s)
- Jianhao Wang
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Hang Yu
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Xiang Li
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Fang Li
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Hongyu Chen
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Xi Zhang
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Yamei Wang
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Ruifeng Xu
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China; Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100006, China
| | - Feng Gao
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Jiabei Wang
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Pai Liu
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322 USA
| | - Yuke Shi
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Dongdong Qin
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Yiyi Li
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Songyan Liu
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Shuai Ding
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China
| | - Xin-Ya Gao
- Department of Neurology, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, China; Laboratory of Neurology, Henan Provincial People's Hospital, Zhengzhou 450003, China
| | - Zhi-Hao Wang
- Department of Neurology, Renmin Hospital of Wuhan University, Wuhan 430060, China; Center for Neurodegenerative Disease Research, Renmin Hospital of Wuhan University, Wuhan 430060, China.
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The Role of PPARs in Breast Cancer. Cells 2022; 12:cells12010130. [PMID: 36611922 PMCID: PMC9818187 DOI: 10.3390/cells12010130] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/07/2022] [Accepted: 12/26/2022] [Indexed: 12/31/2022] Open
Abstract
Breast cancer is a malignant tumor with high morbidity and lethality. Its pathogenesis is related to the abnormal expression of many genes. The peroxisome proliferator-activated receptors (PPARs) are a class of ligand-dependent transcription factors in the nuclear receptor superfamily. They can regulate the transcription of a large number of target genes, which are involved in life activities such as cell proliferation, differentiation, metabolism, and apoptosis, and regulate physiological processes such as glucose metabolism, lipid metabolism, inflammation, and wound healing. Further, the changes in its expression are associated with various diseases, including breast cancer. The experimental reports related to "PPAR" and "breast cancer" were retrieved from PubMed since the discovery of PPARs and summarized in this paper. This review (1) analyzed the roles and potential molecular mechanisms of non-coordinated and ligand-activated subtypes of PPARs in breast cancer progression; (2) discussed the correlations between PPARs and estrogen receptors (ERs) as the nuclear receptor superfamily; and (3) investigated the interaction between PPARs and key regulators in several signaling pathways. As a result, this paper identifies PPARs as targets for breast cancer prevention and treatment in order to provide more evidence for the synthesis of new drugs targeting PPARs or the search for new drug combination treatments.
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Chemical Mixtures in Household Environments: In Silico Predictions and In Vitro Testing of Potential Joint Action on PPARγ in Human Liver Cells. TOXICS 2022; 10:toxics10050199. [PMID: 35622613 PMCID: PMC9146550 DOI: 10.3390/toxics10050199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Accepted: 04/16/2022] [Indexed: 01/27/2023]
Abstract
There are thousands of chemicals that humans can be exposed to in their everyday environments, the majority of which are currently understudied and lack substantial testing for potential exposure and toxicity. This study aimed to implement in silico methods to characterize the chemicals that co-occur across chemical and product uses in our everyday household environments that also target a common molecular mediator, thus representing understudied mixtures that may exacerbate toxicity in humans. To detail, the Chemical and Products Database (CPDat) was queried to identify which chemicals co-occur across common exposure sources. Chemicals were preselected to include those that target an important mediator of cell health and toxicity, the peroxisome proliferator activated receptor gamma (PPARγ), in liver cells that were identified through query of the ToxCast/Tox21 database. These co-occurring chemicals were thus hypothesized to exert potential joint effects on PPARγ. To test this hypothesis, five commonly co-occurring chemicals (namely, benzyl cinnamate, butyl paraben, decanoic acid, eugenol, and sodium dodecyl sulfate) were tested individually and in combination for changes in the expression of PPARγ and its downstream target, insulin receptor (INSR), in human liver HepG2 cells. Results showed that these likely co-occurring chemicals in household environments increased both PPARγ and INSR expression more significantly when the exposures occurred as mixtures vs. as individual chemicals. Future studies will evaluate such chemical combinations across more doses, allowing for further quantification of the types of joint action while leveraging this method of chemical combination prioritization. This study demonstrates the utility of in silico-based methods to identify chemicals that co-occur in the environment for mixtures toxicity testing and highlights relationships between understudied chemicals and changes in PPARγ-associated signaling.
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Transcription Factor Movement and Exercise-Induced Mitochondrial Biogenesis in Human Skeletal Muscle: Current Knowledge and Future Perspectives. Int J Mol Sci 2022; 23:ijms23031517. [PMID: 35163441 PMCID: PMC8836245 DOI: 10.3390/ijms23031517] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/19/2022] [Accepted: 01/21/2022] [Indexed: 02/01/2023] Open
Abstract
In response to exercise, the oxidative capacity of mitochondria within skeletal muscle increases through the coordinated expression of mitochondrial proteins in a process termed mitochondrial biogenesis. Controlling the expression of mitochondrial proteins are transcription factors—a group of proteins that regulate messenger RNA transcription from DNA in the nucleus and mitochondria. To fulfil other functions or to limit gene expression, transcription factors are often localised away from DNA to different subcellular compartments and undergo rapid movement or accumulation only when required. Although many transcription factors involved in exercise-induced mitochondrial biogenesis have been identified, numerous conflicting findings and gaps exist within our knowledge of their subcellular movement. This review aims to summarise and provide a critical analysis of the published literature regarding the exercise-induced movement of transcription factors involved in mitochondria biogenesis in skeletal muscle.
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Meister S, Hahn L, Beyer S, Paul C, Mitter S, Kuhn C, von Schönfeldt V, Corradini S, Sudan K, Schulz C, Kolben TM, Mahner S, Jeschke U, Kolben T. Regulation of Epigenetic Modifications in the Placenta during Preeclampsia: PPARγ Influences H3K4me3 and H3K9ac in Extravillous Trophoblast Cells. Int J Mol Sci 2021; 22:ijms222212469. [PMID: 34830351 PMCID: PMC8622744 DOI: 10.3390/ijms222212469] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/15/2021] [Accepted: 11/15/2021] [Indexed: 12/12/2022] Open
Abstract
The aim of this study was to analyze the expression of peroxisome proliferator-activated receptor γ (PPARγ) and retinoid X receptor α (RxRα), a binding heterodimer playing a pivotal role in the successful trophoblast invasion, in the placental tissue of preeclamptic patients. Furthermore, we aimed to characterize a possible interaction between PPARγ and H3K4me3 (trimethylated lysine 4 of the histone H3), respectively H3K9ac (acetylated lysine 9 of the histone H3), to illuminate the role of histone modifications in a defective trophoblast invasion in preeclampsia (PE). Therefore, the expression of PPARγ and RxRα was analyzed in 26 PE and 25 control placentas by immunohistochemical peroxidase staining, as well as the co-expression with H3K4me3 and H3K9ac by double immunofluorescence staining. Further, the effect of a specific PPARγ-agonist (Ciglitazone) and PPARγ-antagonist (T0070907) on the histone modifications H3K9ac and H3K4me3 was analyzed in vitro. In PE placentas, we found a reduced expression of PPARγ and RxRα and a reduced co-expression with H3K4me3 and H3K9ac in the extravillous trophoblast (EVT). Furthermore, with the PPARγ-antagonist treated human villous trophoblast (HVT) cells and primary isolated EVT cells showed higher levels of the histone modification proteins whereas treatment with the PPARγ-agonist reduced respective histone modifications. Our results show that the stimulation of PPARγ-activity leads to a reduction of H3K4me3 and H3K9ac in trophoblast cells, but paradoxically decreases the nuclear PPARγ expression. As the importance of PPARγ, being involved in a successful trophoblast invasion has already been investigated, our results reveal a pathophysiologic connection between PPARγ and the epigenetic modulation via H3K4me3 and H3K9ac in PE.
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Affiliation(s)
- Sarah Meister
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
- Correspondence: (S.M.); (U.J.); Tel.: +49-89-4400-54266 (S.M.); Fax: +49-89-4400-54916 (S.M.)
| | - Laura Hahn
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
| | - Susanne Beyer
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
| | - Corinna Paul
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
| | - Sophie Mitter
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
| | - Christina Kuhn
- Department of Gynecology and Obstetrics, University Hospital Augsburg, 86156 Augsburg, Germany;
| | - Viktoria von Schönfeldt
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
| | - Stefanie Corradini
- Department of Radiation Oncology, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany;
| | - Kritika Sudan
- Medizinische Klinik und Poliklinik I, Klinikum der Universität München LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (K.S.); (C.S.)
| | - Christian Schulz
- Medizinische Klinik und Poliklinik I, Klinikum der Universität München LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (K.S.); (C.S.)
| | - Theresa Maria Kolben
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
| | - Sven Mahner
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
| | - Udo Jeschke
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
- Department of Gynecology and Obstetrics, University Hospital Augsburg, 86156 Augsburg, Germany;
- Correspondence: (S.M.); (U.J.); Tel.: +49-89-4400-54266 (S.M.); Fax: +49-89-4400-54916 (S.M.)
| | - Thomas Kolben
- Department of Gynecology and Obstetrics, University Hospital, LMU Munich, Marchioninistr. 15, 81377 Munich, Germany; (L.H.); (S.B.); (C.P.); (S.M.); (V.v.S.); (T.M.K.); (S.M.); (T.K.)
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6
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Ahmed J, Meszaros A, Lazar T, Tompa P. DNA-binding domain as the minimal region driving RNA-dependent liquid-liquid phase separation of androgen receptor. Protein Sci 2021; 30:1380-1392. [PMID: 33938068 PMCID: PMC8197421 DOI: 10.1002/pro.4100] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 04/29/2021] [Accepted: 04/30/2021] [Indexed: 12/19/2022]
Abstract
Androgen receptor (AR) is a nuclear hormone receptor that regulates the transcription of genes involved in the development of testis, prostate and the nervous system. Misregulation of AR is a major driver of prostate cancer (PC). The primary agonist of full-length AR is testosterone, whereas its splice variants, for example, AR-v7 implicated in cancer may lack a ligand-binding domain and are thus devoid of proper hormonal control. Recently, it was demonstrated that full-length AR, but not AR-v7, can undergo liquid-liquid phase separation (LLPS) in a cellular model of PC. In a detailed bioinformatics and deletion analysis, we have analyzed which AR region is responsible for LLPS. We found that its DNA-binding domain (DBD) can bind RNA and can undergo RNA-dependent LLPS. RNA regulates its LLPS in a reentrant manner, that is, it has an inhibitory effect at higher concentrations. As RNA binds DBD more weakly than DNA, while both RNA and DNA localizes into AR droplets, its LLPS depends on the relative concentration of the two nucleic acids. The region immediately preceding DBD has no effect on the LLPS propensity of AR, whereas the functional part of its long N-terminal disordered transactivation domain termed activation function 1 (AF1) inhibits AR-v7 phase separation. We suggest that the resulting diminished LLPS tendency of AR-v7 may contribute to the misregulation of the transcription function of AR in prostate cancer.
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Affiliation(s)
- Junaid Ahmed
- VIB‐VUB Center for Structural Biology, Vlaams Instituut voor BiotechnologyBrusselsBelgium
- Structural Biology Brussels (SBB), Bioengineering Sciences DepartmentVrije Universiteit Brussel (VUB)BrusselsBelgium
| | - Attila Meszaros
- VIB‐VUB Center for Structural Biology, Vlaams Instituut voor BiotechnologyBrusselsBelgium
- Structural Biology Brussels (SBB), Bioengineering Sciences DepartmentVrije Universiteit Brussel (VUB)BrusselsBelgium
| | - Tamas Lazar
- VIB‐VUB Center for Structural Biology, Vlaams Instituut voor BiotechnologyBrusselsBelgium
- Structural Biology Brussels (SBB), Bioengineering Sciences DepartmentVrije Universiteit Brussel (VUB)BrusselsBelgium
| | - Peter Tompa
- VIB‐VUB Center for Structural Biology, Vlaams Instituut voor BiotechnologyBrusselsBelgium
- Structural Biology Brussels (SBB), Bioengineering Sciences DepartmentVrije Universiteit Brussel (VUB)BrusselsBelgium
- Institute of Enzymology, Research Centre for Natural SciencesBudapestHungary
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Ghosh S, Chakraborty J, Goswami A, Bhowmik S, Roy S, Ghosh A, Dokania S, Kumari P, Datta S, Chowdhury A, Bhattacharyya SN, Chatterjee R, Banerjee S. A novel microRNA boosts hyper-β-oxidation of fatty acids in liver by impeding CEP350-mediated sequestration of PPARα and thus restricts chronic hepatitis C. RNA Biol 2020; 17:1352-1363. [PMID: 32507013 DOI: 10.1080/15476286.2020.1768353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Imbalance in lipid metabolism induces steatosis in liver during Chronic hepatitis C (CHC). Contribution of microRNAs in regulating lipid homoeostasis and liver disease progression is well established using small RNA-transcriptome data. Owing to the complexity in the development of liver diseases, the existence and functional importance of yet undiscovered regulatory miRNAs in disease pathogenesis was explored in this study using the unmapped sequences of the transcriptome data of HCV-HCC liver tissues following miRDeep2.pl pipeline. MicroRNA-c12 derived from the first intron of LGR5 of chromosome 12 was identified as one of the miRNA like sequences retrieved in this analysis that showed human specific origin. Northern blot hybridization has proved its existence in the hepatic cell line. Enrichment of premiR-c12 in dicer-deficient cells and miR-c12 in Ago2-RISC complex clearly suggested that it followed canonical miRNA biogenesis pathway and accomplished its regulatory function. Expression of this miRNA was quite low in CHC tissues than normal liver implying HCV-proteins might be regulating its biogenesis. Promoter scanning and ChIP analysis further revealed that under expression of p53 and hyper-methylation of STAT3 binding site upon HCV infection restricted its expression in CHC tissues. Centrosomal protein 350 (CEP350), which sequestered PPARα, was identified as one of the targets of miR-c12 using Miranda and validated by luciferase assay/western blot analysis. Furthermore, reduced triglyceride accumulation and enhanced PPARα mediated transcription of β-oxidation genes upon restoration of miR-c12 in liver cells suggested its role in lipid catabolism. Thus this study is reporting miR-c12 for the first time and showed its' protective role during chronic HCV infection.
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Affiliation(s)
- Suchandrima Ghosh
- Centre for Liver Research, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research , Kolkata, India
| | - Joyeeta Chakraborty
- Human Genetics Unit, Indian Statistical Institute , Kolkata, Human Genetics Unit, India
| | - Avijit Goswami
- Department of Molecular Genetics, Indian Institute of Chemical Biology , Kolkata, India
| | - Sayantani Bhowmik
- Centre for Liver Research, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research , Kolkata, India
| | - Susree Roy
- Centre for Liver Research, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research , Kolkata, India
| | - Amit Ghosh
- Centre for Liver Research, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research , Kolkata, India
| | - Sakshi Dokania
- Centre for Liver Research, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research , Kolkata, India
| | - Priyanka Kumari
- Centre for Liver Research, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research , Kolkata, India
| | - Simanti Datta
- Centre for Liver Research, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research , Kolkata, India
| | - Abhijit Chowdhury
- Department of Hepatology, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research , Kolkata, India
| | | | - Raghunath Chatterjee
- Human Genetics Unit, Indian Statistical Institute , Kolkata, Human Genetics Unit, India
| | - Soma Banerjee
- Centre for Liver Research, School of Digestive and Liver Diseases, Institute of Post Graduate Medical Education and Research , Kolkata, India
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8
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Crombez D, Delcambre S, Nonclercq D, Vander Elst L, Laurent S, Cnop M, Muller RN, Burtea C. Modulation of adiponectin receptors AdipoR1 and AdipoR2 by phage display-derived peptides in in vitro and in vivo models. J Drug Target 2020; 28:831-851. [PMID: 31888393 DOI: 10.1080/1061186x.2019.1710840] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Type 2 diabetes (T2D) is often linked to metabolic syndrome, which assembles various risk factors related to obesity. Plasma levels of adiponectin are decreased in T2D and obese subjects. Aiming to develop a peptide able to bind adiponectin receptors and modulate their signalling pathways, a 12-amino acid sequence homologous in AdipoR1/R2 has been targeted by phage display with a linear 12-mer peptide library. The selected peptide P17 recognises AdipoR1/R2 expressed by skeletal muscle, liver and pancreatic islets. In HepaRG and C2C12 cells, P17 induced the activation of AMPK (AMPKα-pT172) and the expression of succinate dehydrogenase and glucokinase; no cytotoxic effects were observed on HepaRG cells. In db/db mice, P17 promoted body weight and glycaemia stabilisation, decreased plasma triglycerides to the range of healthy mice and increased adiponectin (in high fat-fed mice) and insulin (in chow-fed mice) levels. It restored to the range of healthy mice the tissue levels and subcellular distribution of AdipoR1/R2, AMPKα-pT172 and PPARα-pS12. In liver, P17 reduced steatosis and apoptosis. The docking of P17 to AdipoR is reminiscent of the binding mechanism of adiponectin. To conclude, we have developed an AdipoR1/AdipoR2-targeted peptide that modulates adiponectin signalling pathways and has therapeutic relevance for T2D and obesity associated pathologies.
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Affiliation(s)
- Deborah Crombez
- Department of General, Organic and Biomedical Chemistry, Faculty of Medicine and Pharmacy, University of Mons - UMONS, Mons, Belgium
| | - Sébastien Delcambre
- Department of General, Organic and Biomedical Chemistry, Faculty of Medicine and Pharmacy, University of Mons - UMONS, Mons, Belgium
| | - Denis Nonclercq
- Department of Histology, Faculty of Medicine and Pharmacy, University of Mons - UMONS, Mons, Belgium
| | - Luce Vander Elst
- Department of General, Organic and Biomedical Chemistry, Faculty of Medicine and Pharmacy, University of Mons - UMONS, Mons, Belgium
| | - Sophie Laurent
- Department of General, Organic and Biomedical Chemistry, Faculty of Medicine and Pharmacy, University of Mons - UMONS, Mons, Belgium.,Center for Microscopy and Molecular Imaging, Charleroi, Belgium
| | - Miriam Cnop
- ULB Center for Diabetes Research, Université Libre de Bruxelles (ULB), and Division of Endocrinology, ULB Erasmus Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - Robert N Muller
- Department of General, Organic and Biomedical Chemistry, Faculty of Medicine and Pharmacy, University of Mons - UMONS, Mons, Belgium.,Center for Microscopy and Molecular Imaging, Charleroi, Belgium
| | - Carmen Burtea
- Department of General, Organic and Biomedical Chemistry, Faculty of Medicine and Pharmacy, University of Mons - UMONS, Mons, Belgium
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9
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Osorio JS, Vailati-Riboni M, Palladino A, Luo J, Loor JJ. Application of nutrigenomics in small ruminants: Lactation, growth, and beyond. Small Rumin Res 2017. [DOI: 10.1016/j.smallrumres.2017.06.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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10
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Weidemann M, Schuster-Gossler K, Stauber M, Wrede C, Hegermann J, Ott T, Boldt K, Beyer T, Serth K, Kremmer E, Blum M, Ueffing M, Gossler A. CFAP157 is a murine downstream effector of FOXJ1 that is specifically required for flagellum morphogenesis and sperm motility. Development 2016; 143:4736-4748. [DOI: 10.1242/dev.139626] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 11/09/2016] [Indexed: 12/21/2022]
Abstract
Motile cilia move extracellular fluids or mediate cellular motility. Their function is essential for embryonic development, adult tissue homeostasis and reproduction throughout vertebrates. FOXJ1 is a key transcription factor for the formation of motile cilia but its downstream genetic programme is only partially understood. Here, we characterise a novel FOXJ1 target, Cfap157, that is specifically expressed in motile ciliated tissues in mouse and Xenopus in a FOXJ1-dependent manner. CFAP157 protein localises to basal bodies and interacts with tubulin and the centrosomal protein CEP350. Cfap157 knockout mice appear normal but homozygous males are infertile. Spermatozoa display impaired motility and a novel phenotype: Cfap157-deficient sperm exhibit axonemal loops, supernumerary axonemal profiles with ectopic accessory structures, excess cytoplasm and clustered mitochondria in the midpiece regions, and defective axonemes along the flagella. Our study thus demonstrates an essential sperm-specific function for CFAP157 and suggests that this novel FOXJ1 effector is part of a mechanism that acts during spermiogenesis to suppress the formation of supernumerary axonemes and ensures a correct ultrastructure.
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Affiliation(s)
- Marina Weidemann
- Institute for Molecular Biology, OE5250, Hannover Medical School, Carl-Neuberg-Str. 1, Hannover 30625, Germany
| | - Karin Schuster-Gossler
- Institute for Molecular Biology, OE5250, Hannover Medical School, Carl-Neuberg-Str. 1, Hannover 30625, Germany
| | - Michael Stauber
- Institute for Molecular Biology, OE5250, Hannover Medical School, Carl-Neuberg-Str. 1, Hannover 30625, Germany
| | - Christoph Wrede
- Institute of Functional and Applied Anatomy, OE8840, Hannover Medical School, Carl-Neuberg-Str. 1, Hannover 30625, Germany
| | - Jan Hegermann
- Institute of Functional and Applied Anatomy, OE8840, Hannover Medical School, Carl-Neuberg-Str. 1, Hannover 30625, Germany
| | - Tim Ott
- Institute of Zoology, University of Hohenheim, Garbenstraße 30, Stuttgart 70593, Germany
| | - Karsten Boldt
- Institute of Ophthalmic Research, Center for Ophthalmology, University of Tübingen, Röntgenweg 11, Tübingen 72076, Germany
| | - Tina Beyer
- Institute of Ophthalmic Research, Center for Ophthalmology, University of Tübingen, Röntgenweg 11, Tübingen 72076, Germany
| | - Katrin Serth
- Institute for Molecular Biology, OE5250, Hannover Medical School, Carl-Neuberg-Str. 1, Hannover 30625, Germany
| | - Elisabeth Kremmer
- Institute of Molecular Immunology, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Core Facility Monoclonal Antibodies, Marchioninistr. 25, München 81377, Germany
| | - Martin Blum
- Institute of Zoology, University of Hohenheim, Garbenstraße 30, Stuttgart 70593, Germany
| | - Marius Ueffing
- Institute of Ophthalmic Research, Center for Ophthalmology, University of Tübingen, Röntgenweg 11, Tübingen 72076, Germany
| | - Achim Gossler
- Institute for Molecular Biology, OE5250, Hannover Medical School, Carl-Neuberg-Str. 1, Hannover 30625, Germany
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11
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Wadosky KM, Berthiaume JM, Tang W, Zungu M, Portman MA, Gerdes AM, Willis MS. MuRF1 mono-ubiquitinates TRα to inhibit T3-induced cardiac hypertrophy in vivo. J Mol Endocrinol 2016; 56:273-90. [PMID: 26862156 PMCID: PMC5453669 DOI: 10.1530/jme-15-0283] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Accepted: 02/05/2016] [Indexed: 12/31/2022]
Abstract
Thyroid hormone (TH) is recognized for its role in cellular metabolism and growth and participates in homeostasis of the heart. T3 activates pro-survival pathways including Akt and mTOR. Treatment with T3 after myocardial infarction is cardioprotective and promotes elements of physiological hypertrophic response after cardiac injury. Although T3 is known to benefit the heart, very little about its regulation at the molecular level has been described to date. The ubiquitin proteasome system (UPS) regulates nuclear hormone receptors such as estrogen, progesterone, androgen, and glucocorticoid receptors by both degradatory and non-degradatory mechanisms. However, how the UPS regulates T3-mediated activity is not well understood. In this study, we aim to determine the role of the muscle-specific ubiquitin ligase muscle ring finger-1 (MuRF1) in regulating T3-induced cardiomyocyte growth. An increase in MuRF1 expression inhibits T3-induced physiological cardiac hypertrophy, whereas a decrease in MuRF1 expression enhances T3's activity both in vitro and in cardiomyocytes in vivo MuRF1 interacts directly with TRα to inhibit its activity by posttranslational ubiquitination in a non-canonical manner. We then demonstrated that a nuclear localization apparatus that regulates/inhibits nuclear receptors by sequestering them within a subcompartment of the nucleus was necessary for MuRF1 to inhibit T3 activity. This work implicates a novel mechanism that enhances the beneficial T3 activity specifically within the heart, thereby offering a potential target to enhance cardiac T3 activity in an organ-specific manner.
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Affiliation(s)
- Kristine M Wadosky
- Department of Pathology and Laboratory MedicineUniversity of North Carolina, Chapel Hill, NC, USA
| | - Jessica M Berthiaume
- Department of Physiology & BiophysicsCase Western Reserve University, Cleveland, OH, USA
| | - Wei Tang
- Department of Pathology and Laboratory MedicineUniversity of North Carolina, Chapel Hill, NC, USA
| | - Makhosi Zungu
- Department of Pathology and Laboratory MedicineUniversity of North Carolina, Chapel Hill, NC, USA
| | - Michael A Portman
- Department of PediatricsCenter for Developmental Therapeutics, Seattle Children's Research Institute, University of Washington, Seattle, WA, USA
| | - A Martin Gerdes
- New York Institute of TechnologyCollege of Osteopathic Medicine, New York, NY, USA
| | - Monte S Willis
- Department of Pathology and Laboratory MedicineUniversity of North Carolina, Chapel Hill, NC, USA McAllister Heart InstituteUniversity of North Carolina, Chapel Hill, NC, USA
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12
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Bionaz M, Osorio J, Loor JJ. TRIENNIAL LACTATION SYMPOSIUM: Nutrigenomics in dairy cows: Nutrients, transcription factors, and techniques1,2. J Anim Sci 2015; 93:5531-53. [DOI: 10.2527/jas.2015-9192] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- M. Bionaz
- Department of Animal and Rangeland Sciences, Oregon State University, Corvallis 97333
| | - J. Osorio
- Department of Animal and Rangeland Sciences, Oregon State University, Corvallis 97333
| | - J. J. Loor
- Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana 61801
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13
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Wang S, Li S, Liu Q, Wu K, Zhang J, Wang S, Wang Y, Chen X, Zhang Y, Gao C, Wang F, Huang H, Fu X. The OsSPL16-GW7 regulatory module determines grain shape and simultaneously improves rice yield and grain quality. Nat Genet 2015; 47:949-54. [DOI: 10.1038/ng.3352] [Citation(s) in RCA: 377] [Impact Index Per Article: 41.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 06/10/2015] [Indexed: 02/05/2023]
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14
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Mann MB, Black MA, Jones DJ, Ward JM, Yew CCK, Newberg JY, Dupuy AJ, Rust AG, Bosenberg MW, McMahon M, Print CG, Copeland NG, Jenkins NA. Transposon mutagenesis identifies genetic drivers of Braf(V600E) melanoma. Nat Genet 2015; 47:486-95. [PMID: 25848750 PMCID: PMC4844184 DOI: 10.1038/ng.3275] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Accepted: 03/16/2015] [Indexed: 02/06/2023]
Abstract
Although nearly half of human melanomas harbor oncogenic BRAF(V600E) mutations, the genetic events that cooperate with these mutations to drive melanogenesis are still largely unknown. Here we show that Sleeping Beauty (SB) transposon-mediated mutagenesis drives melanoma progression in Braf(V600E) mutant mice and identify 1,232 recurrently mutated candidate cancer genes (CCGs) from 70 SB-driven melanomas. CCGs are enriched in Wnt, PI3K, MAPK and netrin signaling pathway components and are more highly connected to one another than predicted by chance, indicating that SB targets cooperative genetic networks in melanoma. Human orthologs of >500 CCGs are enriched for mutations in human melanoma or showed statistically significant clinical associations between RNA abundance and survival of patients with metastatic melanoma. We also functionally validate CEP350 as a new tumor-suppressor gene in human melanoma. SB mutagenesis has thus helped to catalog the cooperative molecular mechanisms driving BRAF(V600E) melanoma and discover new genes with potential clinical importance in human melanoma.
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Affiliation(s)
- Michael B Mann
- 1] Cancer Research Program, Houston Methodist Research Institute, Houston, Texas, USA. [2] Institute of Molecular and Cell Biology, Singapore
| | - Michael A Black
- Department of Biochemistry, University of Otago, Dunedin, New Zealand
| | - Devin J Jones
- Cancer Research Program, Houston Methodist Research Institute, Houston, Texas, USA
| | | | | | - Justin Y Newberg
- Cancer Research Program, Houston Methodist Research Institute, Houston, Texas, USA
| | - Adam J Dupuy
- Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA
| | - Alistair G Rust
- Experimental Cancer Genetics, Wellcome Trust Sanger Institute, Hinxton, UK
| | - Marcus W Bosenberg
- 1] Department of Dermatology, Yale University School of Medicine, New Haven, Connecticut, USA. [2] Department of Pathology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Martin McMahon
- 1] Helen Diller Family Comprehensive Cancer Center, University of California, San Francisco, San Francisco, California, USA. [2] Department of Cell and Molecular Pharmacology, University of California, San Francisco, San Francisco, California, USA
| | - Cristin G Print
- 1] Department of Molecular Medicine and Pathology, University of Auckland, Auckland, New Zealand. [2] New Zealand Bioinformatics Institute, University of Auckland, Auckland, New Zealand
| | - Neal G Copeland
- 1] Cancer Research Program, Houston Methodist Research Institute, Houston, Texas, USA. [2] Institute of Molecular and Cell Biology, Singapore
| | - Nancy A Jenkins
- 1] Cancer Research Program, Houston Methodist Research Institute, Houston, Texas, USA. [2] Institute of Molecular and Cell Biology, Singapore
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15
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Mongini PKA, Kramer JM, Ishikawa TO, Herschman H, Esposito D. Candidate chromosome 1 disease susceptibility genes for Sjogren's syndrome xerostomia are narrowed by novel NOD.B10 congenic mice. Clin Immunol 2014; 153:79-90. [PMID: 24685748 DOI: 10.1016/j.clim.2014.03.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 03/18/2014] [Accepted: 03/19/2014] [Indexed: 12/16/2022]
Abstract
Sjogren's syndrome (SS) is characterized by salivary gland leukocytic infiltrates and impaired salivation (xerostomia). Cox-2 (Ptgs2) is located on chromosome 1 within the span of the Aec2 region. In an attempt to demonstrate that COX-2 drives antibody-dependent hyposalivation, NOD.B10 congenic mice bearing a Cox-2flox gene were generated. A congenic line with non-NOD alleles in Cox-2-flanking genes failed manifest xerostomia. Further backcrossing yielded disease-susceptible NOD.B10 Cox-2flox lines; fine genetic mapping determined that critical Aec2 genes lie within a 1.56 to 2.17Mb span of DNA downstream of Cox-2. Bioinformatics analysis revealed that susceptible and non-susceptible lines exhibit non-synonymous coding SNPs in 8 protein-encoding genes of this region, thereby better delineating candidate Aec2 alleles needed for SS xerostomia.
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Affiliation(s)
- Patricia K A Mongini
- The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, 350 Community Drive, Manhasset, NY 11030, USA.
| | - Jill M Kramer
- The Feinstein Institute for Medical Research, North Shore-Long Island Jewish Health System, 350 Community Drive, Manhasset, NY 11030, USA.
| | - Tomo-O Ishikawa
- David Geffen School of Medicine at UCLA, 341 Boyer Hall (MBI), 611 Charles E. Young Drive East, Los Angeles, CA 90095, USA.
| | - Harvey Herschman
- David Geffen School of Medicine at UCLA, 341 Boyer Hall (MBI), 611 Charles E. Young Drive East, Los Angeles, CA 90095, USA.
| | - Donna Esposito
- Charles River Laboratories, Genetic Testing Services, 185 Jordan Road, Troy, NY 12180, USA.
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16
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Miyamoto Y, Baker MA, Whiley PA, Arjomand A, Ludeman J, Wong C, Jans DA, Loveland KL. Towards delineation of a developmental α-importome in the mammalian male germline. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2012; 1833:731-42. [PMID: 23159777 DOI: 10.1016/j.bbamcr.2012.11.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Revised: 11/03/2012] [Accepted: 11/06/2012] [Indexed: 12/28/2022]
Abstract
Nucleocytoplasmic transport mediated by importin proteins is central to many developmental processes, such as precisely regulated germ cell differentiation during spermatogenesis. Here we examine for the first time the dynamic association of importins with cargo during two successive spermatogenic stages: meiotic pachytene spermatocytes and haploid round spermatids of the adult rat testis. Immunoprecipitation followed by mass spectrometry yielded the first non-biased identification of proteins selectively interacting with importin α2, α3 and α4 in each of these cell types. Amongst the 22 novel importin binding proteins identified, 11 contain a predicted classical nuclear localization signal (cNLS) for importin α binding using a new algorithm (Kosugi et al. [22]), although only 6 of these have known nuclear functions. An importin α2-immunoprecipitated protein with a key nuclear role in meiosis, structural maintenance of chromosomes 6 (SMC6), contained a predicted bipartite NLS that was shown to be preferentially recognized by importin α together with importin β1. In contrast, the predicted cNLS of synovial sarcoma, X breakpoint 2 interacting protein (SSX2IP) was found not to confer either nuclear accumulation or direct binding to importin αs, implying that NLS prediction algorithms may identify cryptic importin binding sites or require additional refinement to increase their accuracy. Unbiased identification of importin α binding proteins in cellular differentiation represents a powerful tool to help identify the functional roles of importin αs.
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Affiliation(s)
- Yoichi Miyamoto
- Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, VIC 3800, Australia
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17
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Wen JJ, Garg NJ. Proteome expression and carbonylation changes during Trypanosoma cruzi infection and Chagas disease in rats. Mol Cell Proteomics 2011; 11:M111.010918. [PMID: 22199233 DOI: 10.1074/mcp.m111.010918] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Inflammation and oxidative stress, elicited by Trypanosoma cruzi infection, are important pathologic events during progressive Chagasic cardiomyopathy. In this study, we infected Sprague-Dawley rats with T. cruzi, and treated with phenyl-α-tert-butylnitrone (PBN-antioxidant) and/or benznidazole (BZ-anti-parasite). We employed two-dimensional gel electrophoresis/mass spectrometry to investigate (a) the plasma proteomic changes associated with infection and disease development, and (b) the beneficial effects of PBN and BZ in controlling the disease-associated plasma profile. Matrix-assisted laser desorption ionization/time of flight (MALDI-TOF) tandem MS (MS/MS) analysis of differentially expressed (total 146) and oxidized (total 48) protein spots yielded 92 unique proteins. Our data showed that treatment with PBN and BZ restored the differential expression of 65% and 30% of the disease-associated proteins to normal level, respectively, and PBN prevented development of oxidative adducts on plasma proteins. Western blotting to detect dinitrophenyl-derivatized carbonyl-proteins revealed plasma proteins were maximally oxidized during acute infection. Functional and disease/disorder analyses allocated a majority of the differentially expressed and oxidized proteins into inflammation/immunity and lipid metabolism categories and to molecular pathways associated with heart disease (e.g. cardiac infarction, contractile dysfunction, hypertrophy, and hypertension) in chagasic rats, and to curative pathways (e.g. ROS scavenging capacity, immune regulation) in infected rats treated with PBN and/or BZ. We validated the two-dimensional gel electrophoresis results by Western blotting, and demonstrated that the disease-associated increased expression of gelsolin and vimentin and release of cardiac MYL2 in the plasma of chagasic rats was returned to control level by PBN/BZ treatment. Increased plasma levels of gelsolin, MYL2 and vimentin were directly correlated with the severity of cardiac disease in human chagasic patients. Together, these results demonstrate the plasma oxidative and inflammatory response profile, and plasma detection of cardiac proteins parallels the pathologic events contributing to Chagas disease development, and is of potential utility in diagnosing disease severity and designing suitable therapy for management of human chagasic patients.
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Affiliation(s)
- Jian-Jun Wen
- Department of Microbiology and Immunology, The University of Texas Medical Branch, Galveston, Texas 77555-1070, USA
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18
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Mulvihill EE, Assini JM, Lee JK, Allister EM, Sutherland BG, Koppes JB, Sawyez CG, Edwards JY, Telford DE, Charbonneau A, St-Pierre P, Marette A, Huff MW. Nobiletin attenuates VLDL overproduction, dyslipidemia, and atherosclerosis in mice with diet-induced insulin resistance. Diabetes 2011; 60:1446-57. [PMID: 21471511 PMCID: PMC3292317 DOI: 10.2337/db10-0589] [Citation(s) in RCA: 143] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Increased plasma concentrations of apolipoprotein B100 often present in patients with insulin resistance and confer increased risk for the development of atherosclerosis. Naturally occurring polyphenolic compounds including flavonoids have antiatherogenic properties. The aim of the current study was to evaluate the effect of the polymethoxylated flavonoid nobiletin on lipoprotein secretion in cultured human hepatoma cells (HepG2) and in a mouse model of insulin resistance and atherosclerosis. RESEARCH DESIGN AND METHODS Lipoprotein secretion was determined in HepG2 cells incubated with nobiletin or insulin. mRNA abundance was evaluated by quantitative real-time PCR, and Western blotting was used to demonstrate activation of cell signaling pathways. In LDL receptor-deficient mice (Ldlr(-/-)) fed a Western diet supplemented with nobiletin, metabolic parameters, gene expression, fatty acid oxidation, glucose homeostasis, and energy expenditure were documented. Atherosclerosis was quantitated by histological analysis. RESULTS In HepG2 cells, activation of mitogen-activated protein kinase-extracellular signal-related kinase signaling by nobiletin or insulin increased LDLR and decreased MTP and DGAT1/2 mRNA, resulting in marked inhibition of apoB100 secretion. Nobiletin, unlike insulin, did not induce phosphorylation of the insulin receptor or insulin receptor substrate-1 and did not stimulate lipogenesis. In fat-fed Ldlr(-/-) mice, nobiletin attenuated dyslipidemia through a reduction in VLDL-triglyceride (TG) secretion. Nobiletin prevented hepatic TG accumulation, increased expression of Pgc1α and Cpt1α, and enhanced fatty acid β-oxidation. Nobiletin did not activate any peroxisome proliferator-activated receptor (PPAR), indicating that the metabolic effects were PPAR independent. Nobiletin increased hepatic and peripheral insulin sensitivity and glucose tolerance and dramatically attenuated atherosclerosis in the aortic sinus. CONCLUSIONS Nobiletin provides insight into treatments for dyslipidemia and atherosclerosis associated with insulin-resistant states.
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Affiliation(s)
- Erin E. Mulvihill
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Biochemistry, The University of Western Ontario, London, Ontario, Canada
| | - Julia M. Assini
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Biochemistry, The University of Western Ontario, London, Ontario, Canada
| | - Justin K. Lee
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
| | - Emma M. Allister
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
| | | | - Julie B. Koppes
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
| | - Cynthia G. Sawyez
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Medicine, The University of Western Ontario, London, Ontario, Canada
| | - Jane Y. Edwards
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Medicine, The University of Western Ontario, London, Ontario, Canada
| | - Dawn E. Telford
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Medicine, The University of Western Ontario, London, Ontario, Canada
| | | | | | - André Marette
- Department of Medicine, Laval University, Quebec City, Quebec, Canada
| | - Murray W. Huff
- Vascular Biology, Robarts Research Institute, London, Ontario, Canada
- Department of Biochemistry, The University of Western Ontario, London, Ontario, Canada
- Department of Medicine, The University of Western Ontario, London, Ontario, Canada
- Corresponding author: Murray W. Huff,
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19
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Bugge A, Grøntved L, Aagaard MM, Borup R, Mandrup S. The PPARgamma2 A/B-domain plays a gene-specific role in transactivation and cofactor recruitment. Mol Endocrinol 2009; 23:794-808. [PMID: 19282365 DOI: 10.1210/me.2008-0236] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
We have previously shown that adenoviral expression of peroxisome proliferator-activated receptors (PPARs) leads to rapid establishment of transcriptionally active complexes and activation of target gene expression within 5-8 h after transduction. Here we have used the adenoviral delivery system combined with expression array analysis to identify novel putative PPARgamma target genes in murine fibroblasts and to determine the role of the A/B-domain in PPARgamma-mediated transactivation of genomic target genes. Of the 257 genes found to be induced by PPARgamma2 expression, only 25 displayed A/B-domain dependency, i.e. significantly reduced induction in the cells expressing the truncated PPARgamma lacking the A/B-domain (PPARgammaCDE). Nine of the 25 A/B-domain-dependent genes were involved in lipid storage, and in line with this, triglyceride accumulation was considerably decreased in the cells expressing PPARgammaCDE compared with cells expressing full-length PPARgamma2. Using chromatin immunoprecipitation, we demonstrate that PPARgamma binding to genomic target sites and recruitment of the mediator component TRAP220/MED1/PBP/DRIP205 is not affected by the deletion of the A/B-domain. By contrast, the PPARgamma-mediated cAMP response element-binding protein (CREB)-binding protein (CBP) and p300 recruitment to A/B-domain-dependent target genes is compromised by deletion of the A/B-domain. These results indicate that the A/B-domain of PPARgamma2 is specifically involved in the recruitment or stabilization of CBP- and p300-containing cofactor complexes to a subset of target genes.
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Affiliation(s)
- Anne Bugge
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense M, Denmark
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20
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Takahashi K, Yamaguchi S, Shimoyama T, Seki H, Miyokawa K, Katsuta H, Tanaka T, Yoshimoto K, Ohno H, Nagamatsu S, Ishida H. JNK- and IkappaB-dependent pathways regulate MCP-1 but not adiponectin release from artificially hypertrophied 3T3-L1 adipocytes preloaded with palmitate in vitro. Am J Physiol Endocrinol Metab 2008; 294:E898-909. [PMID: 18303122 DOI: 10.1152/ajpendo.00131.2007] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Obese conditions increase the expression of adipocytokine monocyte chemoattractant protein-1 (MCP-1) in adipose tissue as well as MCP-1 plasma levels. To investigate the mechanism behind increased MCP-1, we used a model in which 3T3-L1 adipocytes were artificially hypertrophied by preloading with palmitate in vitro. As observed in obesity, under our model conditions, palmitate-preloaded cells showed significantly increased oxidative stress and increased MCP-1 expression relative to control cells. This increased MCP-1 expression was enhanced by adding exogenous tumor necrosis factor-alpha (TNF-alpha; 17.8-fold vs. control cells, P < 0.01) rather than interleukin-1beta (IL-1beta; 2.6-fold vs. control cells, P < 0.01). However, endogenous TNF-alpha and IL-1beta release was not affected in hypertrophied cells, suggesting that these endogenous cytokines do not mediate hypertrophy-induced increase in MCP-1. MCP-1 secretion from hypertrophied cells was significantly decreased by treatment with antioxidant N-acetyl-cysteine, JNK inhibitors SP600125 and JIP-1 peptide, and IkappaB phosphorylation inhibitors BAY 11-7085 and BMS-345541 (P < 0.01). MCP-1 secretion was not affected by peroxisome proliferator-activated receptor-gamma (PPARgamma) antagonists assayed. Adiponectin, another adipocytokine studied in parallel, also showed increased release in hypertrophy relative to control cells. But in contrast to MCP-1, adiponectin release was significantly suppressed by both exogenous TNF-alpha and IL-1beta as well as by PPARgamma antagonists bisphenol A diglycidyl ether and T0070907 (P < 0.01). JNK inhibitors and IkappaB phosphorylation inhibitors showed no significant effect on adiponectin. We conclude that adipocyte hypertrophy through palmitate loading causes oxidative stress, which in turn increases MCP-1 expression and secretion through JNK and IkappaB signaling. In contrast, the parallel increase in adiponectin expression appears to be related to the PPARgamma ligand properties of palmitate.
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Affiliation(s)
- Kazuto Takahashi
- Third Department of Internal Medicine, Kyorin University School of Medicine, Tokyo, Japan
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21
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Grant JE, Hu J, Liu T, Jain MR, Elkabes S, Li H. Post-translational modifications in the rat lumbar spinal cord in experimental autoimmune encephalomyelitis. J Proteome Res 2007; 6:2786-91. [PMID: 17567059 PMCID: PMC2435290 DOI: 10.1021/pr070013c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Changes in protein methylation, citrullination, and phosphorylation during experimental autoimmune encephalomyelitis, a rodent model of multiple sclerosis, were evaluated using isobaric tags for relative and absolute quantification analysis of peptides produced from normal and diseased rat lumbar spinal cords. We observed alterations in the post-translational modification of key proteins regulating signal transduction and axonal integrity. Dephosphorylation of discrete serine residues within the neurofilament heavy subunit C-terminus was observed. We report for the first time elevated citrullination of Arg27 in glial fibrillary acidic protein, which may contribute to the pathophysiology of astrocytes.
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Affiliation(s)
- Jennifer E Grant
- Center for Advanced Proteomics Research and Department of Biochemistry and Molecular Biology, UMDNJ-New Jersey Medical School Cancer Center, Newark, New Jersey 07103, USA
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22
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Burns KA, Vanden Heuvel JP. Modulation of PPAR activity via phosphorylation. Biochim Biophys Acta Mol Cell Biol Lipids 2007; 1771:952-60. [PMID: 17560826 PMCID: PMC2712836 DOI: 10.1016/j.bbalip.2007.04.018] [Citation(s) in RCA: 329] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2006] [Revised: 03/06/2007] [Accepted: 04/30/2007] [Indexed: 02/08/2023]
Abstract
Peroxisome proliferator-activated receptors (PPARs) are members of the nuclear receptor superfamily of transcription factors that respond to specific ligands by altering gene expression in a cell-, developmental- and sex-specific manner. Three subtypes of this receptor have been discovered (PPARalpha, beta and gamma), each apparently evolving to fulfill different biological niches. PPARs control a variety of target genes involved in lipid homeostasis, diabetes and cancer. Similar to other nuclear receptors, the PPARs are phosphoproteins and their transcriptional activity is affected by cross-talk with kinases and phosphatases. Phosphorylation by the mitogen-activated protein kinases (ERK- and p38-MAPK), Protein Kinase A and C (PKA, PKC), AMP Kinase (AMPK) and glycogen synthase kinase-3 (GSK3) affect their activity in a ligand-dependent or -independent manner. The effects of phosphorylation depend on the cellular context, receptor subtype and residue metabolized which can be manifested at several steps in the PPAR activation sequence including ligand affinity, DNA binding, coactivator recruitment and proteasomal degradation. The review will summarize the known PPAR kinases that directly act on these receptors, the sites affected and the result of this modification on receptor activity.
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Affiliation(s)
| | - John P. Vanden Heuvel
- To whom correspondence should be addressed: Jack Vanden Heuvel, PhD, Professor of Molecular Toxicology, Penn State University, 325 Life Sciences Building, University Park, PA 16802, T: (814) 863-8532, F: (814) 863-1696, , jackvh.cas.psu.edu
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23
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von Knethen A, Soller M, Tzieply N, Weigert A, Johann AM, Jennewein C, Köhl R, Brüne B. PPARgamma1 attenuates cytosol to membrane translocation of PKCalpha to desensitize monocytes/macrophages. ACTA ACUST UNITED AC 2007; 176:681-94. [PMID: 17325208 PMCID: PMC2064025 DOI: 10.1083/jcb.200605038] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Recently, we provided evidence that PKCα depletion in monocytes/macrophages contributes to cellular desensitization during sepsis. We demonstrate that peroxisome proliferator–activated receptor γ (PPARγ) agonists dose dependently block PKCα depletion in response to the diacylglycerol homologue PMA in RAW 264.7 and human monocyte–derived macrophages. In these cells, we observed PPARγ-dependent inhibition of nuclear factor-κB (NF-κB) activation and TNF-α expression in response to PMA. Elucidating the underlying mechanism, we found PPARγ1 expression not only in the nucleus but also in the cytoplasm. Activation of PPARγ1 wild type, but not an agonist-binding mutant of PPARγ1, attenuated PMA-mediated PKCα cytosol to membrane translocation. Coimmunoprecipitation assays pointed to a protein–protein interaction of PKCα and PPARγ1, which was further substantiated using a mammalian two-hybrid system. Applying PPARγ1 mutation and deletion constructs, we identified the hinge helix 1 domain of PPARγ1 that is responsible for PKCα binding. Therefore, we conclude that PPARγ1-dependent inhibition of PKCα translocation implies a new model of macrophage desensitization.
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Affiliation(s)
- Andreas von Knethen
- Institute of Biochemistry I, Faculty of Medicine, Johann Wolfgang Goethe University, 60590 Frankfurt, Theodor-Stern-Kai 7, Germany.
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Johann AM, von Knethen A, Lindemann D, Brüne B. Recognition of apoptotic cells by macrophages activates the peroxisome proliferator-activated receptor-gamma and attenuates the oxidative burst. Cell Death Differ 2005; 13:1533-40. [PMID: 16341123 DOI: 10.1038/sj.cdd.4401832] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
It is appreciated that phagocytosis of apoptotic cells (AC) is an immunological relevant process that shapes the pro- versus anti-inflammatory macrophage phenotype. It was our intention to study the respiratory burst, a prototype marker of macrophage activation, under the impact of AC. Following incubation of RAW264.7 macrophages with AC, we noticed attenuated production of reactive oxygen species (ROS) in response to PMA treatment, and observed a correlation between attenuated ROS formation and suppression of protein kinase Calpha (PKCalpha) activation. EMSA analysis demonstrated an immediate activation of peroxisome proliferator-activated receptor-gamma (PPARgamma) following supplementation of AC to macrophages. In macrophages carrying a dominant-negative PPARgamma mutant, recognition of AC no longer suppressed PKCalpha activation, and the initial phase of ROS formation was largely restored. Interference with actin polymerization and transwell experiments suggest that recognition of AC by macrophages suffices to attenuate the early phase of ROS formation that is attributed to PPARgamma activation.
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Affiliation(s)
- A M Johann
- Institute of Biochemistry I, Faculty of Medicine, Johann Wolfgang Goethe-University Frankfurt, Theodor-Stern-Kai 7, Frankfurt 60590, Germany
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Yan X, Habedanck R, Nigg EA. A complex of two centrosomal proteins, CAP350 and FOP, cooperates with EB1 in microtubule anchoring. Mol Biol Cell 2005; 17:634-44. [PMID: 16314388 PMCID: PMC1356575 DOI: 10.1091/mbc.e05-08-0810] [Citation(s) in RCA: 122] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The anchoring of microtubules (MTs) to subcellular structures is critical for cell shape, polarity, and motility. In mammalian cells, the centrosome is a prominent MT anchoring structure. A number of proteins, including ninein, p150Glued, and EB1, have been implicated in centrosomal MT anchoring, but the process is far from understood. Here we show that CAP350 and FOP (FGFR1 oncogene partner) form a centrosomal complex required for MT anchoring. We show that the C-terminal domain of CAP350 interacts directly with FOP and that both proteins localize to the centrosome throughout the cell cycle. FOP also binds to EB1 and is required for localizing EB1 to the centrosome. Depletion of either CAP350, FOP, or EB1 by siRNA causes loss of MT anchoring and profound disorganization of the MT network. These results have implications for the mechanisms underlying MT anchoring at the centrosome and they attribute a key MT anchoring function to two novel centrosomal proteins, CAP350 and FOP.
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Affiliation(s)
- Xiumin Yan
- Department of Cell Biology, Max-Planck-Institute of Biochemistry, D-82152 Martinsried, Germany
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Feige JN, Gelman L, Tudor C, Engelborghs Y, Wahli W, Desvergne B. Fluorescence imaging reveals the nuclear behavior of peroxisome proliferator-activated receptor/retinoid X receptor heterodimers in the absence and presence of ligand. J Biol Chem 2005; 280:17880-90. [PMID: 15731109 DOI: 10.1074/jbc.m500786200] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
In a global approach combining fluorescence recovery after photobleaching (FRAP), fluorescence correlation spectroscopy (FCS), and fluorescence resonance energy transfer (FRET), we address the behavior in living cells of the peroxisome proliferator-activated receptors (PPARs), a family of nuclear receptors involved in lipid and glucose metabolism, inflammation control, and wound healing. We first demonstrate that unlike several other nuclear receptors, PPARs do not form speckles upon ligand activation. The subnuclear structures that may be observed under some experimental conditions result from overexpression of the protein and our immunolabeling experiments suggest that these structures are subjected to degradation by the proteasome. Interestingly and in contrast to a general assumption, PPARs readily heterodimerize with retinoid X receptor (RXR) in the absence of ligand in living cells. PPAR diffusion coefficients indicate that all the receptors are engaged in complexes of very high molecular masses and/or interact with relatively immobile nuclear components. PPARs are not immobilized by ligand binding. However, they exhibit a ligand-induced reduction of mobility, probably due to enhanced interactions with cofactors and/or chromatin. Our study draws attention to the limitations and pitfalls of fluorescent chimera imaging and demonstrates the usefulness of the combination of FCS, FRAP, and FRET to assess the behavior of nuclear receptors and their mode of action in living cells.
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Affiliation(s)
- Jérôme N Feige
- Center for Integrative Genomics, NCCR Frontiers in Genetics, University of Lausanne, CH-1015 Lausanne, Switzerland
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