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de Cavanagh EMV, Inserra F, Ferder L. Renin-angiotensin system inhibitors positively impact on multiple aging regulatory pathways: Could they be used to protect against human aging? Physiol Rep 2024; 12:e16094. [PMID: 38924381 PMCID: PMC11200104 DOI: 10.14814/phy2.16094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 05/18/2024] [Accepted: 05/18/2024] [Indexed: 06/28/2024] Open
Abstract
The renin-angiotensin system (RAS)-a classical blood pressure regulator-largely contributes to healthy organ development and function. Besides, RAS activation promotes age-related changes and age-associated diseases, which are attenuated/abolished by RAS-blockade in several mammalian species. RAS-blockers also increase rodent lifespan. In previous work, we discussed how RAS-blockade downregulates mTOR and growth hormone/IGF-1 signaling, and stimulates AMPK activity (together with klotho, sirtuin, and vitamin D-receptor upregulation), and proposed that at least some of RAS-blockade's aging benefits are mediated through regulation of these intermediaries and their signaling to mitochondria. Here, we included RAS-blockade's impact on other aging regulatory pathways, that is, TGF-ß, NF-kB, PI3K, MAPK, PKC, Notch, and Wnt, all of which affect mitochondria. No direct evidence is available on RAS/RAS-blockade-aging regulatory pathway-mitochondria interactions. However, existing results allow to conjecture that RAS-blockers neutralize mitochondrial dysfunction by acting on the discussed pathways. The reviewed evidence led us to propose that the foundation is laid for conducting clinical trials aimed at testing whether angiotensin-converting enzyme inhibitors (ACEi) or angiotensin receptor blockers (ARB)-even at subclinical doses-offer the possibility to live longer and in better health. As ACEi and ARB are low cost and well-tolerated anti-hypertension therapies in use for over 35 years, investigating their administration to attenuate/prevent aging effects seems simple to implement.
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Affiliation(s)
| | - Felipe Inserra
- Department of MedicineMaimonides UniversityBuenos AiresArgentina
- Master of Vascular Mechanics and Arterial Hypertension, Postgraduate DepartmentAustral UniversityPilarArgentina
| | - León Ferder
- Department of MedicineMaimonides UniversityBuenos AiresArgentina
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Multiple Mechanisms of NOTCH1 Activation in Chronic Lymphocytic Leukemia: NOTCH1 Mutations and Beyond. Cancers (Basel) 2022; 14:cancers14122997. [PMID: 35740661 PMCID: PMC9221163 DOI: 10.3390/cancers14122997] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 06/14/2022] [Accepted: 06/14/2022] [Indexed: 11/20/2022] Open
Abstract
Simple Summary Mutations of the NOTCH1 gene are a validated prognostic marker in chronic lymphocytic leukemia and a potential predictive marker for anti-CD20-based therapies. At present, the most frequent pathological alteration of the NOTCH1 gene is due to somatic genetic mutations, which have a multifaceted functional impact. However, beside NOTCH1 mutations, other factors may lead to activation of the NOTCH1 pathway, and these include mutations of FBXW7, MED12, SPEN, SF3B1 as well as other B-cell pathways. Understanding the preferential strategies though which CLL cells hijack NOTCH1 signaling may present important clues for designing targeted treatment strategies for the management of CLL. Abstract The Notch signaling pathway plays a fundamental role for the terminal differentiation of multiple cell types, including B and T lymphocytes. The Notch receptors are transmembrane proteins that, upon ligand engagement, undergo multiple processing steps that ultimately release their intracytoplasmic portion. The activated protein ultimately operates as a nuclear transcriptional co-factor, whose stability is finely regulated. The Notch pathway has gained growing attention in chronic lymphocytic leukemia (CLL) because of the high rate of somatic mutations of the NOTCH1 gene. In CLL, NOTCH1 mutations represent a validated prognostic marker and a potential predictive marker for anti-CD20-based therapies, as pathological alterations of the Notch pathway can provide significant growth and survival advantage to neoplastic clone. However, beside NOTCH1 mutation, other events have been demonstrated to perturb the Notch pathway, namely somatic mutations of upstream, or even apparently unrelated, proteins such as FBXW7, MED12, SPEN, SF3B1, as well as physiological signals from other pathways such as the B-cell receptor. Here we review these mechanisms of activation of the NOTCH1 pathway in the context of CLL; the resulting picture highlights how multiple different mechanisms, that might occur under specific genomic, phenotypic and microenvironmental contexts, ultimately result in the same search for proliferative and survival advantages (through activation of MYC), as well as immune escape and therapy evasion (from anti-CD20 biological therapies). Understanding the preferential strategies through which CLL cells hijack NOTCH1 signaling may present important clues for designing targeted treatment strategies for the management of CLL.
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Kongkavitoon P, Butta P, Sanpavat A, Bhattarakosol P, Tangtanatakul P, Wongprom B, Tangkijvanich P, Hirankarn N, Palaga T. Regulation of periostin expression by Notch signaling in hepatocytes and liver cancer cell lines. Biochem Biophys Res Commun 2018; 506:739-745. [PMID: 30384995 DOI: 10.1016/j.bbrc.2018.10.144] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 10/23/2018] [Indexed: 12/29/2022]
Abstract
Notch signaling is involved in both differentiation of hepatocyte progenitors and hepatocellular carcinoma (HCC). The mechanism whereby Notch signaling regulates cellular transformation in hepatocytes is still controversial. This study investigated the impact of overexpressing truncated intracellular Notch1 (NICD1) on transcriptomic profiles of immortalized human hepatocytes. RNA sequencing and gene ontology enrichment analysis revealed that extracellular matrix organization and hyaluronan biosynthesis process gene sets are among those affected by Notch hyperactivation. The relationship between Notch signaling and periostin, an extracellular matrix protein highly expressed in HCC, were further studied. Modulating Notch signaling through NICD1 overexpression or treatment with a gamma secretase inhibitor resulted in increased or decreased periostin expression, respectively, in HCC and liver bile duct carcinoma cell lines. Based on The Cancer Genome Atlas database, mRNA levels of NOTCH1 and POSTN are positively correlated in tumor tissues but not in nontumor tissues. Two consensus RBPJ binding motifs were identified in the -3932/-3921 and + 2522/+2533 bp of POSTN regulatory regions, and NOTCH1 is associated with these binding sites in a liver bile duct carcinoma cell line. Taken together, these results indicate that Notch signaling directly regulates transcription of POSTN in hepatocytes and liver cancer cell lines and may be a candidate for drug targeting in liver cancer.
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Affiliation(s)
- Pornrat Kongkavitoon
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand; Center of Excellence in Immunology and Immune-mediated Diseases, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Patcharavadee Butta
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand; Center of Excellence in Immunology and Immune-mediated Diseases, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Anapat Sanpavat
- Department of Pathology, Faculty of Medicine, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Pattarasinee Bhattarakosol
- Department of Mathematics and Computer Science, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Pattarin Tangtanatakul
- Center of Excellence in Immunology and Immune-mediated Diseases, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand; Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Benjawan Wongprom
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand; Center of Excellence in Immunology and Immune-mediated Diseases, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Pisit Tangkijvanich
- Center of Excellence in Hepatitis and Liver Cancer, Faculty of Medicine, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Nattiya Hirankarn
- Center of Excellence in Immunology and Immune-mediated Diseases, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand; Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand
| | - Tanapat Palaga
- Department of Microbiology, Faculty of Science, Chulalongkorn University, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand; Center of Excellence in Immunology and Immune-mediated Diseases, Phayathai Road, Pathumwan, Bangkok, 10330, Thailand.
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4
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Lin HY, Liang YK, Dou XW, Chen CF, Wei XL, Zeng D, Bai JW, Guo YX, Lin FF, Huang WH, Du CW, Li YC, Chen M, Zhang GJ. Notch3 inhibits epithelial-mesenchymal transition in breast cancer via a novel mechanism, upregulation of GATA-3 expression. Oncogenesis 2018; 7:59. [PMID: 30100605 PMCID: PMC6087713 DOI: 10.1038/s41389-018-0069-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Revised: 06/06/2018] [Accepted: 06/11/2018] [Indexed: 02/05/2023] Open
Abstract
Notch3 and GATA binding protein 3 (GATA-3) have been, individually, shown to maintain luminal phenotype and inhibit epithelial-mesenchymal transition (EMT) in breast cancers. In the present study, we report that Notch3 expression positively correlates with that of GATA-3, and both are associated with estrogen receptor-α (ERα) expression in breast cancer cells. We demonstrate in vitro and in vivo that Notch3 suppressed EMT and breast cancer metastasis by activating GATA-3 transcription. Furthermore, Notch3 knockdown downregulated GATA-3 and promoted EMT; while overexpression of Notch3 intracellular domain upregulated GATA-3 and inhibited EMT, leading to a suppression of metastasis in vivo. Moreover, inhibition or overexpression of GATA-3 partially reversed EMT or mesenchymal-epithelial transition induced by Notch3 alterations. In breast cancer patients, high GATA-3 expression is associated with higher Notch3 expression and lower lymph node metastasis, especially for hormone receptor (HR) positive cancers. Herein, we demonstrate a novel mechanism whereby Notch3 inhibit EMT by transcriptionally upregulating GATA-3 expression, at least in part, leading to the suppression of cancer metastasis in breast cancers. Our findings expand our current knowledge on Notch3 and GATA-3's roles in breast cancer metastasis.
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Affiliation(s)
- Hao-Yu Lin
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- Department of Breast and Thyroid Surgery, The First Affiliated Hospital of SUMC, Shantou, China
| | - Yuan-Ke Liang
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- Department of Medical Oncology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ, Groningen, The Netherlands
| | - Xiao-Wei Dou
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
| | - Chun-Fa Chen
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- Department of Breast and Thyroid Surgery, The First Affiliated Hospital of SUMC, Shantou, China
| | - Xiao-Long Wei
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- Department of Pathology, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
| | - De Zeng
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- Department of Breast Medical Oncology, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
| | - Jing-Wen Bai
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- The Cancer Center, Xiang'an Hospital, Xiamen University Medical College, Xiang'an Dong Rd, 2000, Xiamen, China
| | - Yu-Xian Guo
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
| | - Fang-Fang Lin
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
| | - Wen-He Huang
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
| | - Cai-Wen Du
- Department of Oncology, Shenzhen Hospital of Chinese Academy of Medical Science affiliated Cancer Hospital, Shenzhen, China
| | - Yao-Chen Li
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China
| | - Min Chen
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China.
| | - Guo-Jun Zhang
- The Breast Center, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China.
- ChangJiang Scholar's Laboratory, The Cancer Hospital of Shantou University Medical College (SUMC), Shantou, China.
- The Cancer Center, Xiang'an Hospital, Xiamen University Medical College, Xiang'an Dong Rd, 2000, Xiamen, China.
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Lin HY, Zeng D, Liang YK, Wei XL, Chen CF. GATA3 and TRPS1 are distinct biomarkers and prognostic factors in breast cancer: database mining for GATA family members in malignancies. Oncotarget 2017; 8:34750-34761. [PMID: 28423734 PMCID: PMC5471008 DOI: 10.18632/oncotarget.16160] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 02/13/2017] [Indexed: 02/05/2023] Open
Abstract
GATA transcription factors are zinc finger DNA binding proteins that activate transcription during development and cell differentiation. To date, 7 members of GATA family have been reported. However, the expression patterns and the exact roles of distinct GATA family members contributing to tumorigenesis and progression of breast cancer (BC) remain to be elucidated. Here, we studied the expression of GATA transcripts in a variety of tumor types compared with the normal controls using the ONCOMINE and GOBO databases, along with their corresponding expression profiles in an array of cancer cell lines through CCLE analysis. Based on Kaplan-Meier plotter, we further investigated the prognostic values of GATA members specifically high expressed in BC patients. It was found that, when compared with normal tissues, GATA3 and TRPS1 were distinctly high expressed in BC patients among all GATA members. GATA3 expression was significantly associated with ESR1, while TRPS1 was correlated with ERBB2. In survival analysis, GATA3 and TRPS1 mRNA high expressions were correlated to better survival in BC patients, and TRPS1 high expression was significantly associated with longer RFS in patients who have received chemotherapy. These results suggest that GATA3 and TRPS1 are distinct biomarkers and essential prognostic factors for breast cancer.
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Affiliation(s)
- Hao-Yu Lin
- Department of Breast and Thyroid Surgery, The First Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - De Zeng
- Department of Breast Medical Oncology, Cancer Hospital of Shantou University Medical College, Shantou, China
- ChangJiang Scholar's Laboratory of Shantou University Medical College, Shantou, China
| | - Yuan-Ke Liang
- ChangJiang Scholar's Laboratory of Shantou University Medical College, Shantou, China
- Department of Medical Oncology, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Xiao-Long Wei
- Department of Pathology, Cancer Hospital of SUMC, Shantou, China
| | - Chun-Fa Chen
- Department of Breast and Thyroid Surgery, The First Affiliated Hospital of Shantou University Medical College, Shantou, China
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6
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Ehrlichia chaffeensis TRP120 Activates Canonical Notch Signaling To Downregulate TLR2/4 Expression and Promote Intracellular Survival. mBio 2016; 7:mBio.00672-16. [PMID: 27381289 PMCID: PMC4958247 DOI: 10.1128/mbio.00672-16] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
UNLABELLED Ehrlichia chaffeensis preferentially targets mononuclear phagocytes and survives through a strategy of subverting innate immune defenses, but the mechanisms are unknown. We have shown E. chaffeensis type 1 secreted tandem repeat protein (TRP) effectors are involved in diverse molecular pathogen-host interactions, such as the TRP120 interaction with the Notch receptor-cleaving metalloprotease ADAM17. In the present study, we demonstrate E. chaffeensis, via the TRP120 effector, activates the canonical Notch signaling pathway to promote intracellular survival. We found that nuclear translocation of the transcriptionally active Notch intracellular domain (NICD) occurs in response to E. chaffeensis or recombinant TRP120, resulting in upregulation of Notch signaling pathway components and target genes notch1, adam17, hes, and hey Significant differences in canonical Notch signaling gene expression levels (>40%) were observed during early and late stages of infection, indicating activation of the Notch pathway. We linked Notch pathway activation specifically to the TRP120 effector, which directly interacts with the Notch metalloprotease ADAM17. Using pharmacological inhibitors and small interfering RNAs (siRNAs) against γ-secretase enzyme, Notch transcription factor complex, Notch1, and ADAM17, we demonstrated that Notch signaling is required for ehrlichial survival. We studied the downstream effects and found that E. chaffeensis TRP120-mediated activation of the Notch pathway causes inhibition of the extracellular signal-regulated kinase 1/2 (ERK1/2) and p38 mitogen-activated protein kinase (MAPK) pathways required for PU.1 and subsequent Toll-like receptor 2/4 (TLR2/4) expression. This investigation reveals a novel mechanism whereby E. chaffeensis exploits the Notch pathway to evade the host innate immune response for intracellular survival. IMPORTANCE E. chaffeensis is an obligately intracellular bacterium and the etiologic agent of human monocytotropic ehrlichiosis (HME), an emerging life-threatening tick-borne zoonosis. Mechanisms by which E. chaffeensis establishes intracellular infection and avoids innate host defenses are not understood, but functionally relevant host-pathogen interactions with type 1 secreted TRP effectors are essential for the ehrlichial cellular reprogramming strategy. This study provides further insight into the molecular strategies used by obligately intracellular pathogens such as E. chaffeensis, which have small genomes and a limited number of effector proteins and exploit evolutionarily conserved host cell programs such as Notch signaling to promote infection and intracellular survival.
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7
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Lina TT, Farris T, Luo T, Mitra S, Zhu B, McBride JW. Hacker within! Ehrlichia chaffeensis Effector Driven Phagocyte Reprogramming Strategy. Front Cell Infect Microbiol 2016; 6:58. [PMID: 27303657 PMCID: PMC4885862 DOI: 10.3389/fcimb.2016.00058] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 05/17/2016] [Indexed: 01/02/2023] Open
Abstract
Ehrlichia chaffeensis is a small, gram negative, obligately intracellular bacterium that preferentially infects mononuclear phagocytes. It is the etiologic agent of human monocytotropic ehrlichiosis (HME), an emerging life-threatening tick-borne zoonosis. Mechanisms by which E. chaffeensis establishes intracellular infection, and avoids host defenses are not well understood, but involve functionally relevant host-pathogen interactions associated with tandem and ankyrin repeat effector proteins. In this review, we discuss the recent advances in our understanding of the molecular and cellular mechanisms that underlie Ehrlichia host cellular reprogramming strategies that enable intracellular survival.
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Affiliation(s)
- Taslima T Lina
- Department of Pathology, University of Texas Medical Branch Galveston, TX, USA
| | - Tierra Farris
- Department of Pathology, University of Texas Medical Branch Galveston, TX, USA
| | - Tian Luo
- Department of Pathology, University of Texas Medical Branch Galveston, TX, USA
| | - Shubhajit Mitra
- Department of Pathology, University of Texas Medical Branch Galveston, TX, USA
| | - Bing Zhu
- Department of Pathology, University of Texas Medical Branch Galveston, TX, USA
| | - Jere W McBride
- Department of Pathology, University of Texas Medical BranchGalveston, TX, USA; Department of Microbiology and Immunology, University of Texas Medical BranchGalveston, TX, USA; Center for Biodefense and Emerging Infectious Diseases, University of Texas Medical BranchGalveston, TX, USA; Sealy Center for Vaccine Development, University of Texas Medical BranchGalveston, TX, USA; Institute for Human Infections and Immunity, University of Texas Medical BranchGalveston, TX, USA
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8
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Contreras AN, Yuan Z, Kovall RA. Thermodynamic binding analysis of Notch transcription complexes from Drosophila melanogaster. Protein Sci 2015; 24:812-22. [PMID: 25650119 DOI: 10.1002/pro.2652] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 01/26/2015] [Accepted: 01/27/2015] [Indexed: 12/22/2022]
Abstract
Notch is an intercellular signaling pathway that is highly conserved in metazoans and is essential for proper cellular specification during development and in the adult organism. Misregulated Notch signaling underlies or contributes to the pathogenesis of many human diseases, most notably cancer. Signaling through the Notch pathway ultimately results in changes in gene expression, which is regulated by the transcription factor CSL. Upon pathway activation, CSL forms a ternary complex with the intracellular domain of the Notch receptor (NICD) and the transcriptional coactivator Mastermind (MAM) that activates transcription from Notch target genes. While detailed in vitro studies have been conducted with mammalian and worm orthologous proteins, less is known regarding the molecular details of the Notch ternary complex in Drosophila. Here we thermodynamically characterize the assembly of the fly ternary complex using isothermal titration calorimetry. Our data reveal striking differences in the way the RAM (RBP-J associated molecule) and ANK (ankyrin) domains of NICD interact with CSL that is specific to the fly. Additional analysis using cross-species experiments suggest that these differences are primarily due to fly CSL, while experiments using point mutants show that the interface between fly CSL and ANK is likely similar to the mammalian and worm interface. Finally, we show that the binding of the fly RAM domain to CSL does not affect interactions of the corepressor Hairless with CSL. Taken together, our data suggest species-specific differences in ternary complex assembly that may be significant in understanding how CSL regulates transcription in different organisms.
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Affiliation(s)
- Ashley N Contreras
- Department of Molecular Genetics, Biochemistry and Microbiology, University of Cincinnati, Cincinnati, Ohio, 45267
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Smolarkiewicz M, Skrzypczak T, Michalak M, Leśniewicz K, Walker JR, Ingram G, Wojtaszek P. Gamma-secretase subunits associate in intracellular membrane compartments in Arabidopsis thaliana. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:3015-27. [PMID: 24723404 PMCID: PMC4071823 DOI: 10.1093/jxb/eru147] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Gamma-secretase is a multisubunit complex with intramembrane proteolytic activity. In humans it was identified in genetic screens of patients suffering from familial forms of Alzheimer's disease, and since then it was shown to mediate cleavage of more than 80 substrates, including amyloid precursor protein or Notch receptor. Moreover, in animals, γ-secretase was shown to be involved in regulation of a wide range of cellular events, including cell signalling, regulation of endocytosis of membrane proteins, their trafficking, and degradation. Here we show that genes coding for γ-secretase homologues are present in plant genomes. Also, amino acid motifs crucial for γ-secretase activity are conserved in plants. Moreover, all γ-secretase subunits: PS1/PS2, APH-1, PEN-2, and NCT colocalize and interact with each other in Arabidopsis thaliana protoplasts. The intracellular localization of γ-secretase subunits in Arabidopsis protoplasts revealed a distribution in endomembrane system compartments that is consistent with data from animal studies. Together, our data may be considered as a starting point for analysis of γ-secretase in plants.
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Affiliation(s)
- Michalina Smolarkiewicz
- Department of Molecular and Cellular Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland
| | - Tomasz Skrzypczak
- Department of Molecular and Cellular Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland
| | - Michał Michalak
- Department of Molecular and Cellular Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland
| | - Krzysztof Leśniewicz
- Department of Molecular and Cellular Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland
| | - J Ross Walker
- Institute of Molecular Plant Sciences, University of Edinburgh, King's Buildings, Mayfield Rd, Edinburgh EH9 3JH, UK
| | - Gwyneth Ingram
- Institute of Molecular Plant Sciences, University of Edinburgh, King's Buildings, Mayfield Rd, Edinburgh EH9 3JH, UK UMR 5667 CNRS-INRA-ENSL-UCB Lyon I, Reproduction et Développement des Plantes, ENS Lyon, 46, Allée d'Italie, 69364 LYON Cedex 07, France
| | - Przemysław Wojtaszek
- Department of Molecular and Cellular Biology, Adam Mickiewicz University, Umultowska 89, 61-614 Poznań, Poland
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Zacharioudaki E, Bray SJ. Tools and methods for studying Notch signaling in Drosophila melanogaster. Methods 2014; 68:173-82. [PMID: 24704358 PMCID: PMC4059942 DOI: 10.1016/j.ymeth.2014.03.029] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 03/23/2014] [Accepted: 03/25/2014] [Indexed: 01/08/2023] Open
Abstract
Notch signaling involves a highly conserved pathway that mediates communication between neighboring cells. Activation of Notch by its ligands, results in the release of the Notch intracellular domain (NICD), which enters the nucleus and regulates transcription. This pathway has been implicated in many developmental decisions and diseases (including cancers) over the past decades. The simplicity of the Notch pathway in Drosophila melanogaster, in combination with the availability of powerful genetics, make this an attractive model for studying fundamental principles of Notch regulation and function. In this article we present some of the established and emerging tools that are available to monitor and manipulate the Notch pathway in Drosophila and discuss their strengths and weaknesses.
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Affiliation(s)
- Evanthia Zacharioudaki
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK
| | - Sarah J Bray
- Department of Physiology Development and Neuroscience, University of Cambridge, Downing Street, Cambridge CB2 3DY, UK.
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11
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Marinho HS, Real C, Cyrne L, Soares H, Antunes F. Hydrogen peroxide sensing, signaling and regulation of transcription factors. Redox Biol 2014; 2:535-62. [PMID: 24634836 PMCID: PMC3953959 DOI: 10.1016/j.redox.2014.02.006] [Citation(s) in RCA: 571] [Impact Index Per Article: 57.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2014] [Revised: 02/19/2014] [Accepted: 02/21/2014] [Indexed: 12/12/2022] Open
Abstract
The regulatory mechanisms by which hydrogen peroxide (H2O2) modulates the activity of transcription factors in bacteria (OxyR and PerR), lower eukaryotes (Yap1, Maf1, Hsf1 and Msn2/4) and mammalian cells (AP-1, NRF2, CREB, HSF1, HIF-1, TP53, NF-κB, NOTCH, SP1 and SCREB-1) are reviewed. The complexity of regulatory networks increases throughout the phylogenetic tree, reaching a high level of complexity in mammalians. Multiple H2O2 sensors and pathways are triggered converging in the regulation of transcription factors at several levels: (1) synthesis of the transcription factor by upregulating transcription or increasing both mRNA stability and translation; (ii) stability of the transcription factor by decreasing its association with the ubiquitin E3 ligase complex or by inhibiting this complex; (iii) cytoplasm–nuclear traffic by exposing/masking nuclear localization signals, or by releasing the transcription factor from partners or from membrane anchors; and (iv) DNA binding and nuclear transactivation by modulating transcription factor affinity towards DNA, co-activators or repressors, and by targeting specific regions of chromatin to activate individual genes. We also discuss how H2O2 biological specificity results from diverse thiol protein sensors, with different reactivity of their sulfhydryl groups towards H2O2, being activated by different concentrations and times of exposure to H2O2. The specific regulation of local H2O2 concentrations is also crucial and results from H2O2 localized production and removal controlled by signals. Finally, we formulate equations to extract from typical experiments quantitative data concerning H2O2 reactivity with sensor molecules. Rate constants of 140 M−1 s−1 and ≥1.3 × 103 M−1 s−1 were estimated, respectively, for the reaction of H2O2 with KEAP1 and with an unknown target that mediates NRF2 protein synthesis. In conclusion, the multitude of H2O2 targets and mechanisms provides an opportunity for highly specific effects on gene regulation that depend on the cell type and on signals received from the cellular microenvironment. Complexity of redox regulation increases along the phylogenetic tree. Complex regulatory networks allow for a high degree of H2O2 biological plasticity. H2O2 modulates gene expression at all steps from transcription to protein synthesis. Fast response (s) is mediated by sensors with high H2O2 reactivity. Low reactivity H2O2 sensors may mediate slow (h) or localized H2O2 responses.
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Affiliation(s)
- H. Susana Marinho
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Carla Real
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Luísa Cyrne
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
| | - Helena Soares
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
- Instituto Gulbenkian de Ciência, Oeiras, Portugal
- Escola Superior de Tecnologia da Saúde de Lisboa, IPL, Lisboa, Portugal
| | - Fernando Antunes
- Departamento de Química e Bioquímica, Centro de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Lisboa, Portugal
- Corresponding author.
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Goetz JJ, Farris C, Chowdhury R, Trimarchi JM. Making of a retinal cell: insights into retinal cell-fate determination. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2014; 308:273-321. [PMID: 24411174 DOI: 10.1016/b978-0-12-800097-7.00007-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Understanding the process by which an uncommitted dividing cell produces particular specialized cells within a tissue remains a fundamental question in developmental biology. Many tissues are well suited for cell-fate studies, but perhaps none more so than the developing retina. Traditionally, experiments using the retina have been designed to elucidate the influence that individual environmental signals or transcription factors can have on cell-fate decisions. Despite a substantial amount of information gained through these studies, there is still much that we do not yet understand about how cell fate is controlled on a systems level. In addition, new factors such as noncoding RNAs and regulators of chromatin have been shown to play roles in cell-fate determination and with the advent of "omics" technology more factors will most likely be identified. In this chapter we summarize both the traditional view of retinal cell-fate determination and introduce some new ideas that are providing a challenge to the older way of thinking about the acquisition of cell fates.
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Affiliation(s)
- Jillian J Goetz
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, Iowa, USA
| | - Caitlin Farris
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, Iowa, USA
| | - Rebecca Chowdhury
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, Iowa, USA
| | - Jeffrey M Trimarchi
- Department of Genetics, Development and Cell Biology, Iowa State University, Ames, Iowa, USA.
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Abstract
Notch signaling has been shown over the past few decades to play fundamental roles in a plethora of developmental processes in an evolutionarily conserved fashion. Notch-mediated cell-to-cell signaling is involved in many aspects of embryonic development and control of tissue homeostasis in a variety of adult tissues, and regulates stem cell maintenance, cell differentiation and cellular homeostasis. The focus of this Review is the role of Notch signaling in stem cells, comparing insights from flies, fish and mice to highlight similarities, as well as differences, between species, tissues and stem cell compartments.
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Affiliation(s)
- Ute Koch
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Science, SwissInstitute for Experimental Cancer Research (ISREC), Station 19, 1015 Lausanne, Switzerland.
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Guruharsha KG, Kankel MW, Artavanis-Tsakonas S. The Notch signalling system: recent insights into the complexity of a conserved pathway. Nat Rev Genet 2012; 13:654-66. [PMID: 22868267 DOI: 10.1038/nrg3272] [Citation(s) in RCA: 529] [Impact Index Per Article: 44.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Notch signalling links the fate of one cell to that of an immediate neighbour and consequently controls differentiation, proliferation and apoptotic events in multiple metazoan tissues. Perturbations in this pathway activity have been linked to several human genetic disorders and cancers. Recent genome-scale studies in Drosophila melanogaster have revealed an extraordinarily complex network of genes that can affect Notch activity. This highly interconnected network contrasts our traditional view of the Notch pathway as a simple linear sequence of events. Although we now have an unprecedented insight into the way in which such a fundamental signalling mechanism is controlled by the genome, we are faced with serious challenges in analysing the underlying molecular mechanisms of Notch signal control.
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Affiliation(s)
- K G Guruharsha
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
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