1
|
Makhijani K, Mar J, Gaziova I, Bhat KM. Posttranscriptional regulation of the T-box gene midline via the 3'UTR in Drosophila is complex and cell- and tissue-dependent. Genetics 2024; 227:iyae087. [PMID: 38805187 DOI: 10.1093/genetics/iyae087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Revised: 05/16/2024] [Accepted: 05/17/2024] [Indexed: 05/29/2024] Open
Abstract
The T-box (Tbx) proteins have a 180-230 amino acid DNA-binding domain, first reported in the Brachyury (T) protein. They are highly conserved among metazoans. They regulate a multitude of cellular functions in development and disease. Here, we report posttranscriptional and translational regulation of midline (mid), a Tbx member in Drosophila. We found that the 3'UTR of mid has mRNA degradation elements and AT-rich sequences. In Schneider S2 cells, mid-mRNA could be detected only when the transgene was without the 3'UTR. Similarly, the 3'UTR linked to the Renilla luciferase reporter significantly reduced the activity of the Luciferase, whereas deleting only the degradation elements from the 3'UTR resulted in reduced activity, but not as much. Overexpression of mid in MP2, an embryonic neuroblast, showed no significant difference in the levels of mid-mRNA between the 2 transgenes, with and without the 3'UTR, indicating the absence of posttranscriptional regulation of mid in MP2. Moreover, while elevated mid-RNA was detected in MP2 in nearly all hemisegments, only a fifth of those hemisegments had elevated levels of the protein. Overexpression of the 2 transgenes resulted in MP2-lineage defects at about the same frequency. These results indicate a translational/posttranslational regulation of mid in MP2. The regulation of ectopically expressed mid in the wing imaginal disc was complex. In the wing disc, where mid is not expressed, the ectopic expression of the transgene lacking the 3'UTR had a higher level of mid-RNA and the protein had a stronger phenotypic effect. These results indicate that the 3'UTR can subject mid-mRNA to degradation in a cell- and tissue-specific manner. We further report a balancer-mediated transgenerational modifier effect on the expression and gain of function effects of the 2 transgenes.
Collapse
Affiliation(s)
- Kalpana Makhijani
- Department of Molecular Medicine, University of South Florida, Tampa, FL 33613, USA
| | - Jordan Mar
- Department of Molecular Medicine, University of South Florida, Tampa, FL 33613, USA
| | - Ivana Gaziova
- Department of Neuroscience and Cell Biology, University of Texas Medical Branch School of Medicine, Galveston, TX 77555, USA
| | - Krishna Moorthi Bhat
- Department of Molecular Medicine, University of South Florida, Tampa, FL 33613, USA
- Department of Neuroscience and Cell Biology, University of Texas Medical Branch School of Medicine, Galveston, TX 77555, USA
- Department of Biomedical Engineering, Heersink School of Medicine and School of Engineering, University of Alabama at Birmingham, Birmingham, AL 35233, USA
- Department of Neurology, Heersink School of Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| |
Collapse
|
2
|
Xiang K, Ly J, Bartel DP. Control of poly(A)-tail length and translation in vertebrate oocytes and early embryos. Dev Cell 2024; 59:1058-1074.e11. [PMID: 38460509 DOI: 10.1016/j.devcel.2024.02.007] [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: 09/29/2023] [Revised: 12/28/2023] [Accepted: 02/16/2024] [Indexed: 03/11/2024]
Abstract
During oocyte maturation and early embryogenesis, changes in mRNA poly(A)-tail lengths strongly influence translation, but how these tail-length changes are orchestrated has been unclear. Here, we performed tail-length and translational profiling of mRNA reporter libraries (each with millions of 3' UTR sequence variants) in frog oocytes and embryos and in fish embryos. Contrasting to previously proposed cytoplasmic polyadenylation elements (CPEs), we found that a shorter element, UUUUA, together with the polyadenylation signal (PAS), specify cytoplasmic polyadenylation, and we identified contextual features that modulate the activity of both elements. In maturing oocytes, this tail lengthening occurs against a backdrop of global deadenylation and the action of C-rich elements that specify tail-length-independent translational repression. In embryos, cytoplasmic polyadenylation becomes more permissive, and additional elements specify waves of stage-specific deadenylation. Together, these findings largely explain the complex tapestry of tail-length changes observed in early frog and fish development, with strong evidence of conservation in both mice and humans.
Collapse
Affiliation(s)
- Kehui Xiang
- Howard Hughes Medical Institute, Cambridge, MA 02142, USA; Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - Jimmy Ly
- Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
| | - David P Bartel
- Howard Hughes Medical Institute, Cambridge, MA 02142, USA; Whitehead Institute for Biomedical Research, Cambridge, MA 02142, USA; Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
| |
Collapse
|
3
|
Wu J, Niu L, Yang K, Xu J, Zhang D, Ling J, Xia P, Wu Y, Liu X, Liu J, Zhang J, Yu P. The role and mechanism of RNA-binding proteins in bone metabolism and osteoporosis. Ageing Res Rev 2024; 96:102234. [PMID: 38367813 DOI: 10.1016/j.arr.2024.102234] [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: 10/11/2023] [Revised: 02/06/2024] [Accepted: 02/13/2024] [Indexed: 02/19/2024]
Abstract
Osteoporosis is a prevalent chronic metabolic bone disease that poses a significant risk of fractures or mortality in elderly individuals. Its pathophysiological basis is often attributed to postmenopausal estrogen deficiency and natural aging, making the progression of primary osteoporosis among elderly people, especially older women, seemingly inevitable. The treatment and prevention of osteoporosis progression have been extensively discussed. Recently, as researchers delve deeper into the molecular biological mechanisms of bone remodeling, they have come to realize the crucial role of posttranscriptional gene control in bone metabolism homeostasis. RNA-binding proteins, as essential actors in posttranscriptional activities, may exert influence on osteoporosis progression by regulating the RNA life cycle. This review compiles recent findings on the involvement of RNA-binding proteins in abnormal bone metabolism in osteoporosis and describes the impact of some key RNA-binding proteins on bone metabolism regulation. Additionally, we explore the potential and rationale for modulating RNA-binding proteins as a means of treating osteoporosis, with an overview of drugs that target these proteins.
Collapse
Affiliation(s)
- Jiaqiang Wu
- Jiujiang Clinical Precision Medicine Research Center, Jiujiang, Jiangxi, 332000, China; The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang 330006, China; Department of General Surgery, First Medical Center of the Chinese PLA General Hospital, Beijing, China
| | - Liyan Niu
- HuanKui College of Nanchang University, Nanchang 330006, China
| | - Kangping Yang
- The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang 330006, China
| | - Jingdong Xu
- Queen Mary College of Nanchang University, Nanchang 330006, China
| | - Deju Zhang
- Food and Nutritional Sciences, School of Biological Sciences, The University of Hong Kong, Pokfulam Road, 999077, Hong Kong, China
| | - Jitao Ling
- Department of Endocrinology and Metabolism, The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, No. 1, Minde Road, Donghu District, Nanchang 330006, China; Institute for the Study of Endocrinology and Metabolism in Jiangxi Province, Nanchang 330006, China
| | - Panpan Xia
- Department of Endocrinology and Metabolism, The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, No. 1, Minde Road, Donghu District, Nanchang 330006, China; Institute for the Study of Endocrinology and Metabolism in Jiangxi Province, Nanchang 330006, China
| | - Yuting Wu
- Department of Endocrinology and Metabolism, The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, No. 1, Minde Road, Donghu District, Nanchang 330006, China; Institute for the Study of Endocrinology and Metabolism in Jiangxi Province, Nanchang 330006, China
| | - Xiao Liu
- Department of Cardiology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510275, China
| | - Jianping Liu
- Department of Endocrinology and Metabolism, The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, No. 1, Minde Road, Donghu District, Nanchang 330006, China; Institute for the Study of Endocrinology and Metabolism in Jiangxi Province, Nanchang 330006, China
| | - Jing Zhang
- Jiujiang Clinical Precision Medicine Research Center, Jiujiang, Jiangxi, 332000, China; Department of Anesthesiology, The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi, 330006, China.
| | - Peng Yu
- Jiujiang Clinical Precision Medicine Research Center, Jiujiang, Jiangxi, 332000, China; Department of Endocrinology and Metabolism, The Second Affiliated Hospital, Jiangxi Medical College, Nanchang University, No. 1, Minde Road, Donghu District, Nanchang 330006, China; Institute for the Study of Endocrinology and Metabolism in Jiangxi Province, Nanchang 330006, China.
| |
Collapse
|
4
|
Fuentes Y, Olguín V, López-Ulloa B, Mendonça D, Ramos H, Abdalla A, Guajardo-Contreras G, Niu M, Rojas-Araya B, Mouland A, López-Lastra M. Heterogeneous nuclear ribonucleoprotein K promotes cap-independent translation initiation of retroviral mRNAs. Nucleic Acids Res 2024; 52:2625-2647. [PMID: 38165048 PMCID: PMC10954487 DOI: 10.1093/nar/gkad1221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 12/07/2023] [Accepted: 12/15/2023] [Indexed: 01/03/2024] Open
Abstract
Translation initiation of the human immunodeficiency virus-type 1 (HIV-1) genomic mRNA (vRNA) is cap-dependent or mediated by an internal ribosome entry site (IRES). The HIV-1 IRES requires IRES-transacting factors (ITAFs) for function. In this study, we evaluated the role of the heterogeneous nuclear ribonucleoprotein K (hnRNPK) as a potential ITAF for the HIV-1 IRES. In HIV-1-expressing cells, the depletion of hnRNPK reduced HIV-1 vRNA translation. Furthermore, both the depletion and overexpression of hnRNPK modulated HIV-1 IRES activity. Phosphorylations and protein arginine methyltransferase 1 (PRMT1)-induced asymmetrical dimethylation (aDMA) of hnRNPK strongly impacted the protein's ability to promote the activity of the HIV-1 IRES. We also show that hnRNPK acts as an ITAF for the human T cell lymphotropic virus-type 1 (HTLV-1) IRES, present in the 5'UTR of the viral sense mRNA, but not for the IRES present in the antisense spliced transcript encoding the HTLV-1 basic leucine zipper protein (sHBZ). This study provides evidence for a novel role of the host hnRNPK as an ITAF that stimulates IRES-mediated translation initiation for the retroviruses HIV-1 and HTLV-1.
Collapse
Affiliation(s)
- Yazmín Fuentes
- Laboratorio de Virología Molecular, Instituto Milenio de Inmunología e Inmunoterapia, Departamento de Enfermedades Infecciosas e Inmunología Pediátrica, Escuela de Medicina, Pontificia Universidad Católica de Chile, Marcoleta 391, Santiago, Chile
| | - Valeria Olguín
- Laboratorio de Virología Molecular, Instituto Milenio de Inmunología e Inmunoterapia, Departamento de Enfermedades Infecciosas e Inmunología Pediátrica, Escuela de Medicina, Pontificia Universidad Católica de Chile, Marcoleta 391, Santiago, Chile
| | - Brenda López-Ulloa
- Laboratorio de Virología Molecular, Instituto Milenio de Inmunología e Inmunoterapia, Departamento de Enfermedades Infecciosas e Inmunología Pediátrica, Escuela de Medicina, Pontificia Universidad Católica de Chile, Marcoleta 391, Santiago, Chile
| | - Dafne Mendonça
- Laboratorio de Virología Molecular, Instituto Milenio de Inmunología e Inmunoterapia, Departamento de Enfermedades Infecciosas e Inmunología Pediátrica, Escuela de Medicina, Pontificia Universidad Católica de Chile, Marcoleta 391, Santiago, Chile
| | - Hade Ramos
- Laboratorio de Virología Molecular, Instituto Milenio de Inmunología e Inmunoterapia, Departamento de Enfermedades Infecciosas e Inmunología Pediátrica, Escuela de Medicina, Pontificia Universidad Católica de Chile, Marcoleta 391, Santiago, Chile
| | - Ana Luiza Abdalla
- HIV-1 RNA Trafficking Laboratory, Lady Davis Institute at the Jewish General Hospital, Montréal, Quebec H3T 1E2, Canada
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec H4A 3J1, Canada
| | - Gabriel Guajardo-Contreras
- HIV-1 RNA Trafficking Laboratory, Lady Davis Institute at the Jewish General Hospital, Montréal, Quebec H3T 1E2, Canada
- Department of Medicine, McGill University, Montreal, Quebec H4A 3J1, Canada
| | - Meijuan Niu
- HIV-1 RNA Trafficking Laboratory, Lady Davis Institute at the Jewish General Hospital, Montréal, Quebec H3T 1E2, Canada
| | - Barbara Rojas-Araya
- Laboratorio de Virología Molecular, Instituto Milenio de Inmunología e Inmunoterapia, Departamento de Enfermedades Infecciosas e Inmunología Pediátrica, Escuela de Medicina, Pontificia Universidad Católica de Chile, Marcoleta 391, Santiago, Chile
| | - Andrew J Mouland
- HIV-1 RNA Trafficking Laboratory, Lady Davis Institute at the Jewish General Hospital, Montréal, Quebec H3T 1E2, Canada
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec H4A 3J1, Canada
- Department of Medicine, McGill University, Montreal, Quebec H4A 3J1, Canada
| | - Marcelo López-Lastra
- Laboratorio de Virología Molecular, Instituto Milenio de Inmunología e Inmunoterapia, Departamento de Enfermedades Infecciosas e Inmunología Pediátrica, Escuela de Medicina, Pontificia Universidad Católica de Chile, Marcoleta 391, Santiago, Chile
| |
Collapse
|
5
|
Rahn K, Abdallah AT, Gan L, Herbrich S, Sonntag R, Benitez O, Malaney P, Zhang X, Rodriguez AG, Brottem J, Marx G, Brümmendorf TH, Ostareck DH, Ostareck-Lederer A, Crysandt M, Post SM, Naarmann-de Vries IS. Insight into the mechanism of AML del(9q) progression: hnRNP K targets the myeloid master regulators CEBPA (C/EBPα) and SPI1 (PU.1). BIOCHIMICA ET BIOPHYSICA ACTA. GENE REGULATORY MECHANISMS 2024; 1867:195004. [PMID: 38008244 DOI: 10.1016/j.bbagrm.2023.195004] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 11/08/2023] [Accepted: 11/20/2023] [Indexed: 11/28/2023]
Abstract
Deletions on the long arm of chromosome 9 (del(9q)) are recurrent abnormalities in about 2 % of acute myeloid leukemia cases, which usually involve HNRNPK and are frequently associated with other known aberrations. Based on an Hnrnpk haploinsufficient mouse model, a recent study demonstrated a function of hnRNP K in pathogenesis of myeloid malignancies via the regulation of cellular proliferation and myeloid differentiation programs. Here, we provide evidence that reduced hnRNP K expression results in the dysregulated expression of C/EBPα and additional transcription factors. CyTOF analysis revealed monocytic skewing with increased levels of mature myeloid cells. To explore the role of hnRNP K during normal and pathological myeloid differentiation in humans, we characterized hnRNP K-interacting RNAs in human AML cell lines. Notably, RNA-sequencing revealed several mRNAs encoding key transcription factors involved in the regulation of myeloid differentiation as targets of hnRNP K. We showed that specific sequence motifs confer the interaction of SPI1 and CEBPA 5' and 3'UTRs with hnRNP K. The siRNA mediated reduction of hnRNP K in human AML cells resulted in an increase of PU.1 and C/EBPα that is most pronounced for the p30 isoform. The combinatorial treatment with the inducer of myeloid differentiation valproic acid resulted in increased C/EBPα expression and myeloid differentiation. Together, our results indicate that hnRNP K post-transcriptionally regulates the expression of myeloid master transcription factors. These novel findings can inaugurate novel options for targeted treatment of AML del(9q) by modulation of hnRNP K function.
Collapse
Affiliation(s)
- Kerstin Rahn
- Department of Intensive Care Medicine, University Hospital RWTH Aachen University, Aachen, Germany; Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Ali T Abdallah
- Interdisciplinary Center for Clinical Research (IZKF) Aachen, RWTH Aachen University, Germany; Cluster of Excellence on Cellular Stress Responses in Aging-Associated Diseases (CECAD), University of Cologne, Cologne, Germany
| | - Lin Gan
- Interdisciplinary Center for Clinical Research (IZKF) Aachen, RWTH Aachen University, Germany
| | - Shelley Herbrich
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Roland Sonntag
- Department of Internal Medicine III, University Hospital RWTH Aachen University, Aachen, Germany
| | - Oscar Benitez
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Prerna Malaney
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Xiaorui Zhang
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Ashely G Rodriguez
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Jared Brottem
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Gernot Marx
- Department of Intensive Care Medicine, University Hospital RWTH Aachen University, Aachen, Germany
| | - Tim H Brümmendorf
- Department of Hematology, Oncology, Hemostaseology and Stem Cell Transplantation, University Hospital RWTH Aachen University, Aachen, Germany; Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf (CIO ABCD), Aachen, Germany
| | - Dirk H Ostareck
- Department of Intensive Care Medicine, University Hospital RWTH Aachen University, Aachen, Germany
| | - Antje Ostareck-Lederer
- Department of Intensive Care Medicine, University Hospital RWTH Aachen University, Aachen, Germany
| | - Martina Crysandt
- Department of Hematology, Oncology, Hemostaseology and Stem Cell Transplantation, University Hospital RWTH Aachen University, Aachen, Germany; Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf (CIO ABCD), Aachen, Germany
| | - Sean M Post
- Department of Leukemia, The University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - Isabel S Naarmann-de Vries
- Department of Intensive Care Medicine, University Hospital RWTH Aachen University, Aachen, Germany; Section of Bioinformatics and Systems Cardiology, University Hospital Heidelberg, Heidelberg, Germany.
| |
Collapse
|
6
|
Sousa LG, Alves P, Teixeira N, Correia-da-Silva G, Fonseca BM. Alterations in the pro-resolving lipid mediator machinery within first trimester maternal tissue: Implications in decidualization and miscarriage risk. Prostaglandins Leukot Essent Fatty Acids 2024; 201:102619. [PMID: 38788346 DOI: 10.1016/j.plefa.2024.102619] [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: 01/29/2024] [Revised: 05/06/2024] [Accepted: 05/08/2024] [Indexed: 05/26/2024]
Abstract
A pivotal event in uterine receptivity and human reproduction is the differentiation of endometrial stromal cells into decidual cells, known as decidualization. Decidualization is interlinked with its inflammatory environment. Our study aimed to investigate the presence and role of pro-resolving lipid mediators in first trimester maternal tissue. We assessed the levels of LXA4 and RvD1, along with their metabolic LOX enzymes, in elective (control) and sporadic miscarriage samples. We investigated the effects of LXA4 and RvD1 on decidualization using primary endometrial stromal cells and the immortalized endometrial stromal St-T1b cell line. The upregulation of 12- and 15-LOX expression was observed in pregnancy tissue after sporadic miscarriage, suggesting an inflammatory imbalance. Furthermore, incubation with these lipid mediators led to a decrease in decidualization biomarkers PRL and IGFBP-1, accompanied by morphological changes indicative of aberrant differentiation. The expression of LOX enzymes in decidual natural killer cells suggests their involvement in regulating the inflammatory surroundings and the extent of decidualization.
Collapse
Affiliation(s)
- Luísa G Sousa
- UCIBIO - Applied Molecular Biosciences Unit, Departamento de Ciências Biológicas, Laboratório de Bioquímica, Faculdade de Farmácia da Universidade do Porto, 4050-313 Porto, Portugal; i4HB-Institute for Health and Bioeconomy, Universidade do Porto, 4050-313 Porto, Portugal; Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, 4169-007 Porto, Portugal
| | - Patrícia Alves
- UCIBIO - Applied Molecular Biosciences Unit, Departamento de Ciências Biológicas, Laboratório de Bioquímica, Faculdade de Farmácia da Universidade do Porto, 4050-313 Porto, Portugal; i4HB-Institute for Health and Bioeconomy, Universidade do Porto, 4050-313 Porto, Portugal
| | - Natércia Teixeira
- UCIBIO - Applied Molecular Biosciences Unit, Departamento de Ciências Biológicas, Laboratório de Bioquímica, Faculdade de Farmácia da Universidade do Porto, 4050-313 Porto, Portugal; i4HB-Institute for Health and Bioeconomy, Universidade do Porto, 4050-313 Porto, Portugal
| | - Georgina Correia-da-Silva
- UCIBIO - Applied Molecular Biosciences Unit, Departamento de Ciências Biológicas, Laboratório de Bioquímica, Faculdade de Farmácia da Universidade do Porto, 4050-313 Porto, Portugal; i4HB-Institute for Health and Bioeconomy, Universidade do Porto, 4050-313 Porto, Portugal
| | - Bruno M Fonseca
- UCIBIO - Applied Molecular Biosciences Unit, Departamento de Ciências Biológicas, Laboratório de Bioquímica, Faculdade de Farmácia da Universidade do Porto, 4050-313 Porto, Portugal; i4HB-Institute for Health and Bioeconomy, Universidade do Porto, 4050-313 Porto, Portugal; Escola Superior de Saúde, Instituto Politécnico de Viana do Castelo (IPVC), 4900-347 Viana do Castelo, Portugal.
| |
Collapse
|
7
|
Wang Q, Liu L, Gou X, Zhang T, Zhao Y, Xie Y, Zhou J, Liu Y, Song K. The 3'‑untranslated region of XB130 regulates its mRNA stability and translational efficiency in non‑small cell lung cancer cells. Oncol Lett 2023; 26:427. [PMID: 37720672 PMCID: PMC10502931 DOI: 10.3892/ol.2023.14013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Accepted: 08/02/2023] [Indexed: 09/19/2023] Open
Abstract
Silencing XB130 inhibits cell proliferation and epithelial-mesenchymal transition in non-small cell lung cancer (NSCLC), suggesting that downregulating XB130 expression may impede NSCLC progression. However, the molecular mechanism underlying the regulation of XB130 expression remains unclear. In the present study, the role of the 3'-untranslated region (3'-UTR) in the regulation of XB130 expression was investigated. Recombinant psiCHECK-2 vectors with wild-type, truncated, or mutant XB130 3'-UTR were constructed, and the effects of these insertions on reporter gene expression were examined using a dual-luciferase reporter assay and reverse transcription-quantitative PCR. Additionally, candidate proteins that regulated XB130 expression by binding to critical regions of the XB130 3'-UTR were screened for using an RNA pull-down assay, followed by mass spectrometry and western blotting. The results revealed that insertion of the entire XB130 3'-UTR (1,218 bp) enhanced reporter gene expression. Positive regulatory elements were primarily found in nucleotides 113-989 of the 3'-UTR, while negative regulatory elements were found in the 1-112 and 990-1,218 regions of the 3'-UTR. Deletion analyses identified nucleotides 113-230 and 503-660 of the 3'-UTR as two major fragments that likely promote XB130 expression by increasing mRNA stability and translation rate. Additionally, a U-rich element in the 970-1,053 region of the 3'-UTR was identified as a negative regulatory element that inhibited XB130 expression by suppressing translation. Furthermore, seven candidate proteins that potentially regulated XB130 expression by binding to the 113-230, 503-660, and 970-1,053 regions of the 3'-UTR were identified, shedding light on the regulatory mechanism of XB130 expression. Collectively, these results suggested that complex sequence integrations in the mRNA 3'-UTR variably affected XB130 expression in NSCLC cells.
Collapse
Affiliation(s)
- Qinrong Wang
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Key Laboratory of Medical Molecular Biology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
| | - Lingling Liu
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Key Laboratory of Medical Molecular Biology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
| | - Xuanjing Gou
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Key Laboratory of Medical Molecular Biology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
| | - Ting Zhang
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Key Laboratory of Medical Molecular Biology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
| | - Yan Zhao
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Key Laboratory of Medical Molecular Biology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
| | - Yuan Xie
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Key Laboratory of Medical Molecular Biology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
| | - Jianjiang Zhou
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Key Laboratory of Medical Molecular Biology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
| | - Ying Liu
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Key Laboratory of Medical Molecular Biology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
| | - Kewei Song
- Key Laboratory of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Key Laboratory of Medical Molecular Biology, School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
- Department of Sport and Health, Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
| |
Collapse
|
8
|
Functional Characterization of Transgenic Mice Overexpressing Human 15-Lipoxygenase-1 (ALOX15) under the Control of the aP2 Promoter. Int J Mol Sci 2023; 24:ijms24054815. [PMID: 36902243 PMCID: PMC10003068 DOI: 10.3390/ijms24054815] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 02/24/2023] [Accepted: 02/27/2023] [Indexed: 03/06/2023] Open
Abstract
Arachidonic acid lipoxygenases (ALOX) have been implicated in the pathogenesis of inflammatory, hyperproliferative, neurodegenerative, and metabolic diseases, but the physiological function of ALOX15 still remains a matter of discussion. To contribute to this discussion, we created transgenic mice (aP2-ALOX15 mice) expressing human ALOX15 under the control of the aP2 (adipocyte fatty acid binding protein 2) promoter, which directs expression of the transgene to mesenchymal cells. Fluorescence in situ hybridization and whole-genome sequencing indicated transgene insertion into the E1-2 region of chromosome 2. The transgene was highly expressed in adipocytes, bone marrow cells, and peritoneal macrophages, and ex vivo activity assays proved the catalytic activity of the transgenic enzyme. LC-MS/MS-based plasma oxylipidome analyses of the aP2-ALOX15 mice suggested in vivo activity of the transgenic enzyme. The aP2-ALOX15 mice were viable, could reproduce normally, and did not show major phenotypic alterations when compared with wildtype control animals. However, they exhibited gender-specific differences with wildtype controls when their body-weight kinetics were evaluated during adolescence and early adulthood. The aP2-ALOX15 mice characterized here can now be used for gain-of-function studies evaluating the biological role of ALOX15 in adipose tissue and hematopoietic cells.
Collapse
|
9
|
Cho E, Che X, Ang MJ, Cheon S, Lee J, Kim KS, Lee CH, Lee SY, Yang HY, Moon C, Park C, Choi JY, Lee TH. Peroxiredoxin 5 regulates osteogenic differentiation through interaction with hnRNPK during bone regeneration. eLife 2023; 12:80122. [PMID: 36735291 PMCID: PMC9897727 DOI: 10.7554/elife.80122] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 01/18/2023] [Indexed: 02/04/2023] Open
Abstract
Peroxiredoxin 5 (Prdx5) is involved in pathophysiological regulation via the stress-induced cellular response. However, its function in the bone remains largely unknown. Here, we show that Prdx5 is involved in osteoclast and osteoblast differentiation, resulting in osteoporotic phenotypes in Prdx5 knockout (Prdx5Ko) male mice. To investigate the function of Prdx5 in the bone, osteoblasts were analyzed through immunoprecipitation (IP) and liquid chromatography combined with tandem mass spectrometry (LC-MS/MS) methods, while osteoclasts were analyzed through RNA-sequencing. Heterogeneous nuclear ribonucleoprotein K (hnRNPK) was identified as a potential binding partner of Prdx5 during osteoblast differentiation in vitro. Prdx5 acts as a negative regulator of hnRNPK-mediated osteocalcin (Bglap) expression. In addition, transcriptomic analysis revealed that in vitro differentiated osteoclasts from the bone marrow-derived macrophages of Prdx5Ko mice showed enhanced expression of several osteoclast-related genes. These findings indicate that Prdx5 might contribute to the maintenance of bone homeostasis by regulating osteoblast differentiation. This study proposes a new function of Prdx5 in bone remodeling that may be used in developing therapeutic strategies for bone diseases.
Collapse
Affiliation(s)
- Eunjin Cho
- Department of Oral Biochemistry, Korea Mouse Phenotype Center (KMPC), Dental Science Research Institute, School of Dentistry, Chonnam National UniversityGwangjuRepublic of Korea
| | - Xiangguo Che
- Department of Biochemistry and Cell Biology, BK21 Plus KNU Biomedical Convergence Program, Skeletal Diseases Analysis Center, Korea Mouse Phenotyping Center (KMPC), School of Medicine, Kyungpook National UniversityDaeguRepublic of Korea
| | - Mary Jasmin Ang
- Department of Basic Veterinary Sciences, College of Veterinary Medicine, University of the Philippines Los BañosLos BañosPhilippines
| | - Seongmin Cheon
- School of Biological Sciences and Technology, Chonnam National UniversityGwangjuRepublic of Korea,Proteomics Core Facility, Biomedical Research Institute, Seoul National University HospitalSeoulRepublic of Korea
| | - Jinkyung Lee
- Department of Oral Biochemistry, Korea Mouse Phenotype Center (KMPC), Dental Science Research Institute, School of Dentistry, Chonnam National UniversityGwangjuRepublic of Korea
| | - Kwang Soo Kim
- Department of Microbiology, Department of Molecular Medicine (BK21plus), Chonnam National University Medical SchoolGwangjuRepublic of Korea
| | - Chang Hoon Lee
- Therapeutic & Biotechnology Division, Drug Discovery Platform Research Center, Research Institute of Chemical Technology (KRICT)DaejeonRepublic of Korea
| | - Sang-Yeop Lee
- Research Center for Bioconvergence Analysis, Korea Basic Science InstituteOchangRepublic of Korea
| | - Hee-Young Yang
- Preclinical Research Center, Daegu-Gyeongbuk Medical Innovation FoundationDaeguRepublic of Korea
| | - Changjong Moon
- Department of Veterinary Anatomy and Animal Behavior, College of Veterinary Medicine and BK21 FOUR Program, Chonnam National UniversityGwangjuRepublic of Korea
| | - Chungoo Park
- School of Biological Sciences and Technology, Chonnam National UniversityGwangjuRepublic of Korea
| | - Je-Yong Choi
- Department of Biochemistry and Cell Biology, BK21 Plus KNU Biomedical Convergence Program, Skeletal Diseases Analysis Center, Korea Mouse Phenotyping Center (KMPC), School of Medicine, Kyungpook National UniversityDaeguRepublic of Korea
| | - Tae-Hoon Lee
- Department of Oral Biochemistry, Korea Mouse Phenotype Center (KMPC), Dental Science Research Institute, School of Dentistry, Chonnam National UniversityGwangjuRepublic of Korea
| |
Collapse
|
10
|
Rudich A, Garzon R, Dorrance A. Non-Coding RNAs Are Implicit in Chronic Myeloid Leukemia Therapy Resistance. Int J Mol Sci 2022; 23:ijms232012271. [PMID: 36293127 PMCID: PMC9603161 DOI: 10.3390/ijms232012271] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 10/11/2022] [Accepted: 10/11/2022] [Indexed: 11/16/2022] Open
Abstract
Chronic myeloid leukemia (CML) is a myeloproliferative neoplasm initiated by the presence of the fusion gene BCR::ABL1. The development of tyrosine kinase inhibitors (TKIs) highly specific to p210BCR-ABL1, the constitutively active tyrosine kinase encoded by BCR::ABL1, has greatly improved the prognosis for CML patients. Now, the survival rate of CML nearly parallels that of age matched controls. However, therapy resistance remains a persistent problem in the pursuit of a cure. TKI resistance can be attributed to both BCR::ABL1 dependent and independent mechanisms. Recently, the role of non-coding RNAs (ncRNAs) has been increasingly explored due to their frequent dysregulation in a variety of malignancies. Specifically, microRNAs (miRNAs), circular RNAs (circRNAs), and long non-coding RNAs (lncRNAs) have been shown to contribute to the development and progression of therapy resistance in CML. Since each ncRNA exhibits multiple functions and is capable of controlling gene expression, they exert their effect on CML resistance through a diverse set of mechanisms and pathways. In most cases ncRNAs with tumor suppressing functions are silenced in CML, while those with oncogenic properties are overexpressed. Here, we discuss the relevance of many aberrantly expressed ncRNAs and their effect on therapy resistance in CML.
Collapse
MESH Headings
- Humans
- Fusion Proteins, bcr-abl
- RNA, Circular
- RNA, Long Noncoding/genetics
- Protein Kinase Inhibitors/pharmacology
- Protein Kinase Inhibitors/therapeutic use
- Drug Resistance, Neoplasm/genetics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/drug therapy
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/metabolism
- MicroRNAs/genetics
- MicroRNAs/pharmacology
Collapse
|
11
|
The CFTR Amplifier Nesolicaftor Rescues TGF-β1 Inhibition of Modulator-Corrected F508del CFTR Function. Int J Mol Sci 2022; 23:ijms231810956. [PMID: 36142862 PMCID: PMC9504033 DOI: 10.3390/ijms231810956] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/13/2022] [Accepted: 09/15/2022] [Indexed: 11/16/2022] Open
Abstract
Highly effective cystic fibrosis transmembrane conductance regulator (CFTR) modulators have led to dramatic improvements in lung function in many people with cystic fibrosis (PwCF). However, the efficacy of CFTR modulators may be hindered by persistent airway inflammation. The cytokine transforming growth factor-beta1 (TGF-β1) is associated with worse pulmonary disease in PwCF and can diminish modulator efficacy. Thus, strategies to augment the CFTR response to modulators in an inflammatory environment are needed. Here, we tested whether the CFTR amplifier nesolicaftor (or PTI-428) could rescue the effects of TGF-β1 on CFTR function and ciliary beating in primary human CF bronchial epithelial (CFBE) cells. CFBE cells homozygous for F508del were treated with the combination of elexacaftor/tezacaftor/ivacaftor (ETI) and TGF-β1 in the presence and absence of nesolicaftor. Nesolicaftor augmented the F508del CFTR response to ETI and reversed TGF-β1-induced reductions in CFTR conductance by increasing the expression of CFTR mRNA. Nesolicaftor further rescued the reduced ciliary beating and increased expression of the cytokines IL-6 and IL-8 caused by TGF-β1. Finally, nesolicaftor augmented the F508del CFTR response to ETI in CFBE cells overexpressing miR-145, a negative regulator of CFTR expression. Thus, CFTR amplifiers, but only when used with highly effective modulators, may provide benefit in an inflamed environment.
Collapse
|
12
|
Soria-Tiedemann M, Michel G, Urban I, Aldrovandi M, O’Donnell VB, Stehling S, Kuhn H, Borchert A. Unbalanced Expression of Glutathione Peroxidase 4 and Arachidonate 15-Lipoxygenase Affects Acrosome Reaction and In Vitro Fertilization. Int J Mol Sci 2022; 23:ijms23179907. [PMID: 36077303 PMCID: PMC9456195 DOI: 10.3390/ijms23179907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/19/2022] [Accepted: 08/27/2022] [Indexed: 11/25/2022] Open
Abstract
Glutathione peroxidase 4 (Gpx4) and arachidonic acid 15 lipoxygenase (Alox15) are counterplayers in oxidative lipid metabolism and both enzymes have been implicated in spermatogenesis. However, the roles of the two proteins in acrosomal exocytosis have not been explored in detail. Here we characterized Gpx4 distribution in mouse sperm and detected the enzyme not only in the midpiece of the resting sperm but also at the anterior region of the head, where the acrosome is localized. During sperm capacitation, Gpx4 translocated to the post-acrosomal compartment. Sperm from Gpx4+/Sec46Ala mice heterozygously expressing a catalytically silent enzyme displayed an increased expression of phosphotyrosyl proteins, impaired acrosomal exocytosis after in vitro capacitation and were not suitable for in vitro fertilization. Alox15-deficient sperm showed normal acrosome reactions but when crossed into a Gpx4-deficient background spontaneous acrosomal exocytosis was observed during capacitation and these cells were even less suitable for in vitro fertilization. Taken together, our data indicate that heterozygous expression of a catalytically silent Gpx4 variant impairs acrosomal exocytosis and in vitro fertilization. Alox15 deficiency hardly impacted the acrosome reaction but when crossed into the Gpx4-deficient background spontaneous acrosomal exocytosis was induced. The detailed molecular mechanisms for the observed effects may be related to the compromised redox homeostasis.
Collapse
Affiliation(s)
- Mariana Soria-Tiedemann
- Department of Biochemistry, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Charitéplatz 1, D-10117 Berlin, Germany
| | - Geert Michel
- Department of Transgenic Technologies, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Lindenberger Weg 80, D-13125 Berlin, Germany
| | - Iris Urban
- Department of Transgenic Technologies, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Lindenberger Weg 80, D-13125 Berlin, Germany
| | - Maceler Aldrovandi
- Systems Immunity Research Institute, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
- Helmholtz Zentrum München, Institute of Metabolism and Cell Death, Ingolstädter Landstr. 1, D-85764 Neuherberg, Germany
| | - Valerie B. O’Donnell
- Systems Immunity Research Institute, School of Medicine, Cardiff University, Cardiff CF14 4XN, UK
| | - Sabine Stehling
- Department of Biochemistry, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Charitéplatz 1, D-10117 Berlin, Germany
| | - Hartmut Kuhn
- Department of Biochemistry, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Charitéplatz 1, D-10117 Berlin, Germany
| | - Astrid Borchert
- Department of Biochemistry, Charité—Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Charitéplatz 1, D-10117 Berlin, Germany
- Correspondence: ; Tel.: +49-30-450-528-034
| |
Collapse
|
13
|
Yi Q, Deng Z, Yue J, He J, Xiong J, Sun W, Sun W. RNA binding proteins in osteoarthritis. Front Cell Dev Biol 2022; 10:954376. [PMID: 36003144 PMCID: PMC9393224 DOI: 10.3389/fcell.2022.954376] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 06/27/2022] [Indexed: 11/13/2022] Open
Abstract
Osteoarthritis (OA) is a common chronic degenerative joint disease worldwide. The pathological features of OA are the erosion of articular cartilage, subchondral bone sclerosis, synovitis, and metabolic disorder. Its progression is characterized by aberrant expression of genes involved in inflammation, proliferation, and metabolism of chondrocytes. Effective therapeutic strategies are limited, as mechanisms underlying OA pathophysiology remain unclear. Significant research efforts are ongoing to elucidate the complex molecular mechanisms underlying OA focused on gene transcription. However, posttranscriptional alterations also play significant function in inflammation and metabolic changes related diseases. RNA binding proteins (RBPs) have been recognized as important regulators in posttranscriptional regulation. RBPs regulate RNA subcellular localization, stability, and translational efficiency by binding to their target mRNAs, thereby controlling their protein expression. However, their role in OA is less clear. Identifying RBPs in OA is of great importance to better understand OA pathophysiology and to figure out potential targets for OA treatment. Hence, in this manuscript, we summarize the recent knowledge on the role of dysregulated RBPs in OA and hope it will provide new insight for OA study and targeted treatment.
Collapse
Affiliation(s)
- Qian Yi
- Department of Bone and Joint Surgery, Shenzhen Second People’s Hospital (The First Affiliated Hospital of Shenzhen University), Shenzhen, China
- Department of Orthopaedics, Affiliated Hospital of Putian University, Putian, China
- Department of Physiology, School of Basic Medical Science, Southwest Medical University, Luzhou, China
| | - Zhenhan Deng
- Department of Sports Medicine, The First Affiliated Hospital of Shenzhen University, Shenzhen Second People’s Hospital, Shenzhen, China
| | - Jiaji Yue
- Department of Bone and Joint Surgery, Shenzhen Second People’s Hospital (The First Affiliated Hospital of Shenzhen University), Shenzhen, China
| | - Jinglong He
- Department of Bone and Joint Surgery, Shenzhen Second People’s Hospital (The First Affiliated Hospital of Shenzhen University), Shenzhen, China
| | - Jianyi Xiong
- Department of Bone and Joint Surgery, Shenzhen Second People’s Hospital (The First Affiliated Hospital of Shenzhen University), Shenzhen, China
| | - Wei Sun
- Department of Bone and Joint Surgery, Shenzhen Second People’s Hospital (The First Affiliated Hospital of Shenzhen University), Shenzhen, China
- *Correspondence: Wei Sun, ; Weichao Sun,
| | - Weichao Sun
- Department of Bone and Joint Surgery, Shenzhen Second People’s Hospital (The First Affiliated Hospital of Shenzhen University), Shenzhen, China
- The Central Laboratory, Shenzhen Second People’s Hospital (The First Affiliated Hospital of Shenzhen University), Shenzhen, China
- *Correspondence: Wei Sun, ; Weichao Sun,
| |
Collapse
|
14
|
Lee J, You JH, Roh JL. Poly(rC)-binding protein 1 represses ferritinophagy-mediated ferroptosis in head and neck cancer. Redox Biol 2022; 51:102276. [PMID: 35290903 PMCID: PMC8921323 DOI: 10.1016/j.redox.2022.102276] [Citation(s) in RCA: 37] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Revised: 02/24/2022] [Accepted: 02/26/2022] [Indexed: 01/18/2023] Open
Abstract
A cytosolic iron chaperone poly(rC)-binding protein 1 (PCBP1) is a multifunctional RNA-binding protein involving gene transcription, RNA regulation, and iron loading to ferritins. PCBP1 is also known to repress autophagy, but the role of PCBP1 in ferritinophagy and ferroptosis remains unrevealed. Therefore, we examined the role of PCBP1 in ferritinophagy-mediated ferroptosis in head and neck cancer (HNC) cells. The effects of system xc– cystine/glutamate antiporter (xCT) inhibitors and PCBP1 gene silencing/overexpression were tested on HNC cell lines and mouse tumor xenograft models. These effects were analyzed by assessing cell viability and death, lipid reactive oxygen species and iron production, lipid, malondialdehyde, mRNA/protein expression, and autophagy flux assays. Interaction between PCBP1 and BECN1 mRNA was also examined by luciferase and RNA-protein pull-down assays. PCBP1 gene silencing increased autophagosome generation and autophagic flux. Conversely, PCBP1 upregulation inhibited autophagy activation via direct binding to the CU-rich elements on the 3′-untranslated region (3′-UTR) of BECN1 mRNA. The internal deletion or mutation of the 3′-UTR F2 region recovered BECN1 mRNA stability repressed by PCBP1, resulting in enhanced ferritinophagy-mediated ferroptosis. Besides, PCBP1 knockdown promoted polyunsaturated fatty acid peroxidation by increasing ALOX15 expression. Further, excess iron accumulation caused mitochondrial dysfunction in PCBP1-suppressed cells. A ferroptosis inducer sulfasalazine significantly suppressed tumor growth in mice with the transplantation of PCBP1-silenced HNC. Our data suggest that the dual functions of PCBP1 repressing BECN1 and ALOX15 mRNAs contribute to attenuating cancer susceptibility to ferroptosis inducers. PCBP1 expression is related to head and neck cancer survival and response to ferroptosis inducers. Knockdown of PCBP1 increased ferroptosis sensitivity by inducing an increased labile iron pool. PCBP1 negatively regulated ferritinophagy by the 3′-UTR binding of BECN1 mRNA. Knockdown of PCBP1 increased lipid peroxidation by ALOX15 expression. PCBP1 depletion promoted ferroptosis susceptibility in vitro and in vivo.
Collapse
|
15
|
Lv C, Sun J, Ye Y, Lin Z, Li H, Liu Y, Mo K, Xu W, Hu W, Draz E, Wang S. LncRNA EIF1AX-AS1 promotes endometrial cancer cell apoptosis by affecting EIF1AX mRNA stabilization. Cancer Sci 2022; 113:1277-1291. [PMID: 35080085 PMCID: PMC8990785 DOI: 10.1111/cas.15275] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 01/11/2022] [Accepted: 01/20/2022] [Indexed: 12/24/2022] Open
Abstract
Long non-coding RNAs (lncRNAs) have been found to play an important role in the occurrence and development of endometrial carcinoma (EC). Here, using RNA sequencing analysis, we systemically screened and identified the lncRNA EIF1AX-AS1, which is aberrantly down-regulated in clinical EC tissues and closely correlated with tumor type. EIF1AX-AS1 markedly inhibited EC cell proliferation and promoted apoptosis in vitro and in vivo. Mechanistically, EIF1AX-AS1 interacts with EIF1AX mRNA and poly C binding protein 1 (PCBP1), which promote eukaryotic translation initiation factor 1A, X-linked (EIF1AX) mRNA degradation. Intriguingly, interaction with IRES-related proteins Y-box binding protein 1 (YBX-1), EIF1AX promotes c-Myc translation through the internal ribosome enter site pathway. c-Myc promotes EIF1AX transcription and thus forms a feed-forward loop to regulate EC cell proliferation. Taken together, these data reveal new insights into the biology driving EC proliferation and highlights the potential of lncRNAs as biomarkers for prognosis and future therapeutic targets for cancer.
Collapse
Affiliation(s)
- Chengyu Lv
- Key Laboratory of Stem Cell Engineering and Regenerative Medicine of Fujian Province University, Fujian Medical University, Fuzhou, 350122, P. R. China.,Department of Obstetrics and Gynecology, Fujian Maternity and Child Health Hospital, Affiliated Hospital of Fujian Medical University, Fuzhou, 350001, P. R. China
| | - Jiandong Sun
- Key Laboratory of Stem Cell Engineering and Regenerative Medicine of Fujian Province University, Fujian Medical University, Fuzhou, 350122, P. R. China
| | - Yuhong Ye
- Department of Anatomy, Histology and Embryology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, 350122, P. R. China.,Department of Pathology, The First Affiliated Hospital of Fujian Medical University, 350005, Fuzhou, P. R.China
| | - Zihang Lin
- Key Laboratory of Stem Cell Engineering and Regenerative Medicine of Fujian Province University, Fujian Medical University, Fuzhou, 350122, P. R. China
| | - Hua Li
- Key Laboratory of Stem Cell Engineering and Regenerative Medicine of Fujian Province University, Fujian Medical University, Fuzhou, 350122, P. R. China.,Department of Anatomy, Histology and Embryology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, 350122, P. R. China
| | - Yue Liu
- Key Laboratory of Stem Cell Engineering and Regenerative Medicine of Fujian Province University, Fujian Medical University, Fuzhou, 350122, P. R. China.,Department of Anatomy, Histology and Embryology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, 350122, P. R. China
| | - Kaien Mo
- Key Laboratory of Stem Cell Engineering and Regenerative Medicine of Fujian Province University, Fujian Medical University, Fuzhou, 350122, P. R. China
| | - Weiwei Xu
- Key Laboratory of Stem Cell Engineering and Regenerative Medicine of Fujian Province University, Fujian Medical University, Fuzhou, 350122, P. R. China
| | - Weitao Hu
- Key Laboratory of Stem Cell Engineering and Regenerative Medicine of Fujian Province University, Fujian Medical University, Fuzhou, 350122, P. R. China
| | - Eman Draz
- Department of Anatomy, Histology and Embryology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, 350122, P. R. China.,Human Anatomy and Embryology department, Suez Canal University, 12411, Egypt
| | - Shie Wang
- Key Laboratory of Stem Cell Engineering and Regenerative Medicine of Fujian Province University, Fujian Medical University, Fuzhou, 350122, P. R. China.,Department of Anatomy, Histology and Embryology, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, 350122, P. R. China
| |
Collapse
|
16
|
Zhao H, Wei Z, Shen G, Chen Y, Hao X, Li S, Wang R. Poly(rC)-binding proteins as pleiotropic regulators in hematopoiesis and hematological malignancy. Front Oncol 2022; 12:1045797. [PMID: 36452487 PMCID: PMC9701828 DOI: 10.3389/fonc.2022.1045797] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 10/26/2022] [Indexed: 11/16/2022] Open
Abstract
Poly(rC)-binding proteins (PCBPs), a defined subfamily of RNA binding proteins, are characterized by their high affinity and sequence-specific interaction with poly-cytosine (poly-C). The PCBP family comprises five members, including hnRNP K and PCBP1-4. These proteins share a relatively similar structure motif, with triple hnRNP K homology (KH) domains responsible for recognizing and combining C-rich regions of mRNA and single- and double-stranded DNA. Numerous studies have indicated that PCBPs play a prominent role in hematopoietic cell growth, differentiation, and tumorigenesis at multiple levels of regulation. Herein, we summarized the currently available literature regarding the structural and functional divergence of various PCBP family members. Furthermore, we focused on their roles in normal hematopoiesis, particularly in erythropoiesis. More importantly, we also discussed and highlighted their involvement in carcinogenesis, including leukemia and lymphoma, aiming to clarify the pleiotropic roles and molecular mechanisms in the hematopoietic compartment.
Collapse
Affiliation(s)
- Huijuan Zhao
- Henan International Joint Laboratory of Thrombosis and Hemostasis, Henan University of Science and Technology, Luoyang, China.,Basic Medical College, Henan University of Science and Technology, Luoyang, China
| | - Ziqing Wei
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, China
| | - Guomin Shen
- Henan International Joint Laboratory of Thrombosis and Hemostasis, Henan University of Science and Technology, Luoyang, China.,Basic Medical College, Henan University of Science and Technology, Luoyang, China
| | - Yixiang Chen
- Henan International Joint Laboratory of Thrombosis and Hemostasis, Henan University of Science and Technology, Luoyang, China.,Basic Medical College, Henan University of Science and Technology, Luoyang, China
| | - Xueqin Hao
- Basic Medical College, Henan University of Science and Technology, Luoyang, China
| | - Sanqiang Li
- Basic Medical College, Henan University of Science and Technology, Luoyang, China
| | - Rong Wang
- Department of Clinical Laboratory, Henan Provincial People's Hospital, People's Hospital of Zhengzhou University, Zhengzhou, China
| |
Collapse
|
17
|
MicroSalmon: A Comprehensive, Searchable Resource of Predicted MicroRNA Targets and 3'UTR Cis-Regulatory Elements in the Full-Length Sequenced Atlantic Salmon Transcriptome. Noncoding RNA 2021; 7:ncrna7040061. [PMID: 34698276 PMCID: PMC8544657 DOI: 10.3390/ncrna7040061] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/17/2021] [Accepted: 09/20/2021] [Indexed: 12/20/2022] Open
Abstract
Complete 3′UTRs unambiguously assigned to specific mRNA isoforms from the Atlantic salmon full-length (FL) transcriptome were collected into a 3′UTRome. miRNA response elements (MREs) and other cis-regulatory motifs were subsequently predicted and assigned to 3′UTRs of all FL-transcripts. The MicroSalmon GitHub repository provides all results. RNAHybrid and sRNAtoolbox tools predicted the MREs. UTRscan and the Teiresias algorithm predicted other 3′UTR cis-acting motifs, both known vertebrate motifs and putative novel motifs. MicroSalmon provides search programs to retrieve all FL-transcripts targeted by a miRNA (median number 1487), all miRNAs targeting an FL-transcript (median number 27), and other cis-acting motifs. As thousands of FL-transcripts may be targets of each miRNA, additional experimental strategies are necessary to reduce the likely true and relevant targets to a number that may be functionally validated. Low-complexity motifs known to affect mRNA decay in vertebrates were over-represented. Many of these were enriched in the terminal end, while purine- or pyrimidine-rich motifs with unknown functions were enriched immediately downstream of the stop codon. Furthermore, several novel complex motifs were over-represented, indicating conservation and putative function. In conclusion, MicroSalmon is an extensive and useful, searchable resource for study of Atlantic salmon transcript regulation by miRNAs and cis-acting 3′UTR motifs.
Collapse
|
18
|
de Vries S, Benes V, Naarmann-de Vries IS, Rücklé C, Zarnack K, Marx G, Ostareck DH, Ostareck-Lederer A. P23 Acts as Functional RBP in the Macrophage Inflammation Response. Front Mol Biosci 2021; 8:625608. [PMID: 34179071 PMCID: PMC8226254 DOI: 10.3389/fmolb.2021.625608] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 05/21/2021] [Indexed: 12/13/2022] Open
Abstract
Macrophages exert the primary cellular immune response. Pathogen components like bacterial lipopolysaccharides (LPS) stimulate macrophage migration, phagocytotic activity and cytokine expression. Previously, we identified the poly(A)+ RNA interactome of RAW 264.7 macrophages. Of the 402 RNA-binding proteins (RBPs), 32 were classified as unique in macrophages, including nineteen not reported to interact with nucleic acids before. Remarkably, P23 a HSP90 co-chaperone, also known as cytosolic prostaglandin E2 synthase (PTGES3), exhibited differential poly(A)+ RNA binding in untreated and LPS-induced macrophages. To identify mRNAs bound by P23 and to elucidate potential regulatory RBP functions in macrophages, we immunoprecipitated P23 from cytoplasmic extracts of cross-linked untreated and LPS-induced cells. RNAseq revealed that enrichment of 44 mRNAs was reduced in response to LPS. Kif15 mRNA, which encodes kinesin family member 15 (KIF15), a motor protein implicated in cytoskeletal reorganization and cell mobility was selected for further analysis. Noteworthy, phagocytic activity of LPS-induced macrophages was enhanced by P23 depletion. Specifically, in untreated RAW 264.7 macrophages, decreased P23 results in Kif15 mRNA destabilization, diminished KIF15 expression and accelerated macrophage migration. We show that the unexpected RBP function of P23 contributes to the regulation of macrophage phagocytotic activity and migration.
Collapse
Affiliation(s)
- Sebastian de Vries
- Department of Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany
| | - Vladimir Benes
- Genomics Core Facility, European Molecular Biology Laboratory (EMBL), Heidelberg, Germany
| | | | - Cornelia Rücklé
- Buchmann Institute of Molecular Life Science, Goethe University Frankfurt, Frankfurt, Germany
| | - Katharina Zarnack
- Buchmann Institute of Molecular Life Science, Goethe University Frankfurt, Frankfurt, Germany
| | - Gernot Marx
- Department of Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany
| | - Dirk H Ostareck
- Department of Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany
| | | |
Collapse
|
19
|
Naarmann-de Vries IS, Senatore R, Moritz B, Marx G, Urlaub H, Niessing D, Ostareck DH, Ostareck-Lederer A. Methylated HNRNPK acts on RPS19 to regulate ALOX15 synthesis in erythropoiesis. Nucleic Acids Res 2021; 49:3507-3523. [PMID: 33660773 PMCID: PMC8034617 DOI: 10.1093/nar/gkab116] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 02/11/2021] [Indexed: 11/23/2022] Open
Abstract
Post-transcriptional control is essential to safeguard structural and metabolic changes in enucleated reticulocytes during their terminal maturation to functional erythrocytes. The timely synthesis of arachidonate 15-lipoxygenase (ALOX15), which initiates mitochondria degradation at the final stage of reticulocyte maturation is regulated by the multifunctional protein HNRNPK. It constitutes a silencing complex at the ALOX15 mRNA 3′ untranslated region that inhibits translation initiation at the AUG by impeding the joining of ribosomal 60S subunits to 40S subunits. To elucidate how HNRNPK interferes with 80S ribosome assembly, three independent screens were applied. They consistently demonstrated a differential interaction of HNRNPK with RPS19, which is localized at the head of the 40S subunit and extends into its functional center. During induced erythroid maturation of K562 cells, decreasing arginine dimethylation of HNRNPK is linked to a reduced interaction with RPS19 in vitro and in vivo. Dimethylation of residues R256, R258 and R268 in HNRNPK affects its interaction with RPS19. In noninduced K562 cells, RPS19 depletion results in the induction of ALOX15 synthesis and mitochondria degradation. Interestingly, residue W52 in RPS19, which is frequently mutated in Diamond-Blackfan Anemia (DBA), participates in specific HNRNPK binding and is an integral part of a putative aromatic cage.
Collapse
Affiliation(s)
| | - Roberta Senatore
- Department of Intensive Care Medicine, University Hospital, RWTH Aachen University, Aachen Germany
| | - Bodo Moritz
- Institute of Pharmacy, Faculty of Natural Sciences, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
| | - Gernot Marx
- Department of Intensive Care Medicine, University Hospital, RWTH Aachen University, Aachen Germany
| | - Henning Urlaub
- Max-Planck-Institute for Biophysical Chemistry, Bioanalytical Mass Spectrometry Group, Göttingen, Germany.,Department of Clinical Chemistry, University Medical Center, Göttingen, Germany
| | - Dierk Niessing
- Institute of Pharmaceutical Biotechnology, Ulm University, Ulm, Germany.,Institute of Structural Biology, Helmholtz Zentrum München, Neuherberg, Germany
| | - Dirk H Ostareck
- Department of Intensive Care Medicine, University Hospital, RWTH Aachen University, Aachen Germany
| | - Antje Ostareck-Lederer
- Department of Intensive Care Medicine, University Hospital, RWTH Aachen University, Aachen Germany
| |
Collapse
|
20
|
Rizzotto D, Zaccara S, Rossi A, Galbraith MD, Andrysik Z, Pandey A, Sullivan KD, Quattrone A, Espinosa JM, Dassi E, Inga A. Nutlin-Induced Apoptosis Is Specified by a Translation Program Regulated by PCBP2 and DHX30. Cell Rep 2021; 30:4355-4369.e6. [PMID: 32234473 DOI: 10.1016/j.celrep.2020.03.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 01/25/2020] [Accepted: 03/04/2020] [Indexed: 12/12/2022] Open
Abstract
Activation of p53 by the small molecule Nutlin can result in a combination of cell cycle arrest and apoptosis. The relative strength of these events is difficult to predict by classical gene expression analysis, leaving uncertainty as to the therapeutic benefits. In this study, we report a translational control mechanism shaping p53-dependent apoptosis. Using polysome profiling, we establish Nutlin-induced apoptosis to associate with the enhanced translation of mRNAs carrying multiple copies of an identified 3' UTR CG-rich motif mediating p53-dependent death (CGPD-motif). We identify PCBP2 and DHX30 as CGPD-motif interactors. We find that in cells undergoing persistent cell cycle arrest in response to Nutlin, CGPD-motif mRNAs are repressed by the PCBP2-dependent binding of DHX30 to the motif. Upon DHX30 depletion in these cells, the translation of CGPD-motif mRNAs increases, and the response to Nutlin shifts toward apoptosis. Instead, DHX30 inducible overexpression in SJSA1 cells leads to decreased translation of CGPD-motif mRNAs.
Collapse
Affiliation(s)
- Dario Rizzotto
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, via Sommarive 9, 38123 Trento, Italy
| | - Sara Zaccara
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, via Sommarive 9, 38123 Trento, Italy
| | - Annalisa Rossi
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, via Sommarive 9, 38123 Trento, Italy
| | - Matthew D Galbraith
- Linda Crnic Institute for Down Syndrome, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Boulder, CO 80203, USA
| | - Zdenek Andrysik
- Linda Crnic Institute for Down Syndrome, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Boulder, CO 80203, USA
| | - Ahwan Pandey
- Linda Crnic Institute for Down Syndrome, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Boulder, CO 80203, USA
| | - Kelly D Sullivan
- Linda Crnic Institute for Down Syndrome, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Boulder, CO 80203, USA
| | - Alessandro Quattrone
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, via Sommarive 9, 38123 Trento, Italy
| | - Joaquín M Espinosa
- Linda Crnic Institute for Down Syndrome, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA; Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Boulder, CO 80203, USA
| | - Erik Dassi
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, via Sommarive 9, 38123 Trento, Italy.
| | - Alberto Inga
- Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, via Sommarive 9, 38123 Trento, Italy.
| |
Collapse
|
21
|
Ho JJD, Man JHS, Schatz JH, Marsden PA. Translational remodeling by RNA-binding proteins and noncoding RNAs. WILEY INTERDISCIPLINARY REVIEWS-RNA 2021; 12:e1647. [PMID: 33694288 DOI: 10.1002/wrna.1647] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 02/09/2021] [Accepted: 02/10/2021] [Indexed: 12/14/2022]
Abstract
Responsible for generating the proteome that controls phenotype, translation is the ultimate convergence point for myriad upstream signals that influence gene expression. System-wide adaptive translational reprogramming has recently emerged as a pillar of cellular adaptation. As classic regulators of mRNA stability and translation efficiency, foundational studies established the concept of collaboration and competition between RNA-binding proteins (RBPs) and noncoding RNAs (ncRNAs) on individual mRNAs. Fresh conceptual innovations now highlight stress-activated, evolutionarily conserved RBP networks and ncRNAs that increase the translation efficiency of populations of transcripts encoding proteins that participate in a common cellular process. The discovery of post-transcriptional functions for long noncoding RNAs (lncRNAs) was particularly intriguing given their cell-type-specificity and historical definition as nuclear-functioning epigenetic regulators. The convergence of RBPs, lncRNAs, and microRNAs on functionally related mRNAs to enable adaptive protein synthesis is a newer biological paradigm that highlights their role as "translatome (protein output) remodelers" and reinvigorates the paradigm of "RNA operons." Together, these concepts modernize our understanding of cellular stress adaptation and strategies for therapeutic development. This article is categorized under: RNA Interactions with Proteins and Other Molecules > Protein-RNA Interactions: Functional Implications Translation > Translation Regulation Regulatory RNAs/RNAi/Riboswitches > Regulatory RNAs.
Collapse
Affiliation(s)
- J J David Ho
- Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, Florida, USA.,Division of Hematology, Department of Medicine, Miller School of Medicine, University of Miami, Miami, Florida, USA
| | - Jeffrey H S Man
- Keenan Research Centre, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario, Canada.,Department of Respirology, University Health Network, Latner Thoracic Research Laboratories, University of Toronto, Toronto, Ontario, Canada
| | - Jonathan H Schatz
- Sylvester Comprehensive Cancer Center, Miller School of Medicine, University of Miami, Miami, Florida, USA.,Division of Hematology, Department of Medicine, Miller School of Medicine, University of Miami, Miami, Florida, USA
| | - Philip A Marsden
- Keenan Research Centre, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada.,Department of Medicine, University of Toronto, Toronto, Ontario, Canada
| |
Collapse
|
22
|
Abstract
The protein-coding regions of mRNAs have the information to make proteins and hence have been at the center of attention for understanding altered protein functions in disease states, including cancer. Indeed, the discovery of genomic alterations and driver mutations that change protein levels and/or activity has been pivotal in our understanding of cancer biology. However, to better understand complex molecular mechanisms that are deregulated in cancers, we also need to look at non-coding parts of mRNAs, including 3'UTRs (untranslated regions), which control mRNA stability, localization, and translation efficiency. Recently, these rather overlooked regions of mRNAs are gaining attention as mounting evidence provides functional links between 3'UTRs, protein functions, and cancer-related molecular mechanisms. Here, roles of 3'UTRs in cancer biology and mechanisms that result in cancer-specific 3'-end isoform variants will be reviewed. An increased appreciation of 3'UTRs may help the discovery of new ways to explain as of yet unknown oncogene activation and tumor suppressor inactivation cases in cancers, and provide new avenues for diagnostic and therapeutic applications.
Collapse
Affiliation(s)
- Ayse Elif Erson-Bensan
- Department of Biological Sciences and Cancer Systems Biology Laboratory, Middle East Technical University (METU, ODTU), Dumlupinar Blv No: 1, Universiteler Mah, 06800, Ankara, Turkey.
| |
Collapse
|
23
|
Nakamoto MY, Lammer NC, Batey RT, Wuttke DS. hnRNPK recognition of the B motif of Xist and other biological RNAs. Nucleic Acids Res 2020; 48:9320-9335. [PMID: 32813011 PMCID: PMC7498318 DOI: 10.1093/nar/gkaa677] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 07/29/2020] [Accepted: 08/06/2020] [Indexed: 12/26/2022] Open
Abstract
Heterogeneous nuclear ribonuclear protein K (hnRNPK) is an abundant RNA-binding protein crucial for a wide variety of biological processes. While its binding preference for multi-cytosine-patch (C-patch) containing RNA is well documented, examination of binding to known cellular targets that contain C-patches reveals an unexpected breadth of binding affinities. Analysis of in-cell crosslinking data reinforces the notion that simple C-patch preference is not fully predictive of hnRNPK localization within transcripts. The individual RNA-binding domains of hnRNPK work together to interact with RNA tightly, with the KH3 domain being neither necessary nor sufficient for binding. Rather, the RG/RGG domain is implicated in providing essential contributions to RNA-binding, but not DNA-binding, affinity. hnRNPK is essential for X chromosome inactivation, where it interacts with Xist RNA specifically through the Xist B-repeat region. We use this interaction with an RNA motif derived from this B-repeat region to determine the RNA-structure dependence of C-patch recognition. While the location preferences of hnRNPK for C-patches are conformationally restricted within the hairpin, these structural constraints are relieved in the absence of RNA secondary structure. Together, these results illustrate how this multi-domain protein's ability to accommodate and yet discriminate between diverse cellular RNAs allows for its broad cellular functions.
Collapse
Affiliation(s)
- Meagan Y Nakamoto
- Department of Biochemistry, University of Colorado, Boulder, CO 80309-0596, USA
| | - Nickolaus C Lammer
- Department of Biochemistry, University of Colorado, Boulder, CO 80309-0596, USA
| | - Robert T Batey
- Department of Biochemistry, University of Colorado, Boulder, CO 80309-0596, USA
| | - Deborah S Wuttke
- Department of Biochemistry, University of Colorado, Boulder, CO 80309-0596, USA
| |
Collapse
|
24
|
Rademacher M, Kuhn H, Borchert A. Systemic deficiency of mouse arachidonate 15-lipoxygenase induces defective erythropoiesis and transgenic expression of the human enzyme rescues this phenotype. FASEB J 2020; 34:14318-14335. [PMID: 32918502 DOI: 10.1096/fj.202000408rr] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 07/29/2020] [Accepted: 08/07/2020] [Indexed: 02/06/2023]
Abstract
Arachidonic acid 15-lipoxygenases (ALOX15) are lipid peroxidizing enzymes, which has previously been implicated in the maturational breakdown of intracellular organelles and plasma membrane remodeling during reticulocyte-erythrocyte transition. Conventional Alox15-/- mice are viable, develop normally but do not exhibit a major defective erythropoietic phenotype. To characterize the putative in vivo relevance of Alox15 for red blood cell development, we explored the impact of systemic inactivation of the Alox15 gene on mouse erythropoiesis. We found that Alox15-/- mice exhibited reduced erythrocyte counts, elevated reticulocyte counts and red cell hyperchromia. The structure of the plasma membrane of Alox15-/- erythrocytes is altered and a significant share of the red cells was present as echinocytes and/or acanthocytes. An increased share of the Alox15-/- erythrocytes cells were annexin V positive, which indicates a loss of plasma membrane asymmetry. Erythrocytes of Alox15-/- mice were more susceptible to osmotic hemolysis and exhibited a reduced ex vivo life span. When we transgenically expressed human ALOX15 in Alox15-/- mice under the control of the aP2 promoter the defective erythropoietic system was rescued and the impaired osmotic resistance was normalized. Together these data suggest the involvement Alox15 in the maturational remodeling of the plasma membrane during red cell development.
Collapse
Affiliation(s)
- Marlena Rademacher
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Biochemistry, Berlin, Germany
| | - Hartmut Kuhn
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Biochemistry, Berlin, Germany
| | - Astrid Borchert
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Biochemistry, Berlin, Germany
| |
Collapse
|
25
|
Beckham SA, Matak MY, Belousoff MJ, Venugopal H, Shah N, Vankadari N, Elmlund H, Nguyen JHC, Semler BL, Wilce MCJ, Wilce JA. Structure of the PCBP2/stem-loop IV complex underlying translation initiation mediated by the poliovirus type I IRES. Nucleic Acids Res 2020; 48:8006-8021. [PMID: 32556302 PMCID: PMC7641305 DOI: 10.1093/nar/gkaa519] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 05/15/2020] [Accepted: 06/06/2020] [Indexed: 02/02/2023] Open
Abstract
The poliovirus type I IRES is able to recruit ribosomal machinery only in the presence of host factor PCBP2 that binds to stem-loop IV of the IRES. When PCBP2 is cleaved in its linker region by viral proteinase 3CD, translation initiation ceases allowing the next stage of replication to commence. Here, we investigate the interaction of PCBP2 with the apical region of stem-loop IV (SLIVm) of poliovirus RNA in its full-length and truncated form. CryoEM structure reconstruction of the full-length PCBP2 in complex with SLIVm solved to 6.1 Å resolution reveals a compact globular complex of PCBP2 interacting with the cruciform RNA via KH domains and featuring a prominent GNRA tetraloop. SEC-SAXS, SHAPE and hydroxyl-radical cleavage establish that PCBP2 stabilizes the SLIVm structure, but upon cleavage in the linker domain the complex becomes more flexible and base accessible. Limited proteolysis and REMSA demonstrate the accessibility of the linker region in the PCBP2/SLIVm complex and consequent loss of affinity of PCBP2 for the SLIVm upon cleavage. Together this study sheds light on the structural features of the PCBP2/SLIV complex vital for ribosomal docking, and the way in which this key functional interaction is regulated following translation of the poliovirus genome.
Collapse
Affiliation(s)
- Simone A Beckham
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
| | - Mehdi Y Matak
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
| | - Matthew J Belousoff
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
| | - Hariprasad Venugopal
- The Ramaciotti Centre for Cryo-Electron Microscopy, Monash University, Victoria 3800, Australia
| | - Neelam Shah
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
| | - Naveen Vankadari
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
| | - Hans Elmlund
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
| | - Joseph H C Nguyen
- Department of Microbiology and Molecular Genetics, School of Medicine, University of California, Irvine, CA 92697-4025, USA
| | - Bert L Semler
- Department of Microbiology and Molecular Genetics, School of Medicine, University of California, Irvine, CA 92697-4025, USA
| | - Matthew C J Wilce
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
| | - Jacqueline A Wilce
- Monash Biomedicine Discovery Institute and Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia
| |
Collapse
|
26
|
RNA-Binding Proteins in Acute Leukemias. Int J Mol Sci 2020; 21:ijms21103409. [PMID: 32408494 PMCID: PMC7279408 DOI: 10.3390/ijms21103409] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 05/07/2020] [Accepted: 05/10/2020] [Indexed: 12/12/2022] Open
Abstract
Acute leukemias are genetic diseases caused by translocations or mutations, which dysregulate hematopoiesis towards malignant transformation. However, the molecular mode of action is highly versatile and ranges from direct transcriptional to post-transcriptional control, which includes RNA-binding proteins (RBPs) as crucial regulators of cell fate. RBPs coordinate RNA dynamics, including subcellular localization, translational efficiency and metabolism, by binding to their target messenger RNAs (mRNAs), thereby controlling the expression of the encoded proteins. In view of the growing interest in these regulators, this review summarizes recent research regarding the most influential RBPs relevant in acute leukemias in particular. The reported RBPs, either dysregulated or as components of fusion proteins, are described with respect to their functional domains, the pathways they affect, and clinical aspects associated with their dysregulation or altered functions.
Collapse
|
27
|
Dukovski D, Villella A, Bastos C, King R, Finley D, Kelly JW, Morimoto RI, Hartl FU, Munoz B, Lee PS, Zecevic M, Miller JP. Amplifiers co-translationally enhance CFTR biosynthesis via PCBP1-mediated regulation of CFTR mRNA. J Cyst Fibros 2020; 19:733-741. [PMID: 32067958 DOI: 10.1016/j.jcf.2020.02.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Revised: 02/01/2020] [Accepted: 02/06/2020] [Indexed: 12/21/2022]
Abstract
BACKGROUND Cystic fibrosis (CF) is a recessive disorder caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. We previously described a first-in-class CFTR modulator that functions as an amplifier to selectively increase CFTR expression and function. The amplifier mechanism is distinct from and complementary to corrector and potentiator classes of CFTR modulators. Here we characterize the mechanism by which amplifiers increase CFTR mRNA, protein, and activity. METHODS Biochemical studies elucidated the action of amplifiers on CFTR mRNA abundance and translation and defined the role of an amplifier-binding protein that was identified using chemical proteomics. RESULTS Amplifiers stabilize CFTR mRNA through a process that requires only the translated sequence of CFTR and involves translational elongation. Amplifiers enrich ER-associated CFTR mRNA and increase its translational efficiency through increasing the fraction of CFTR mRNA associated with polysomes. Pulldowns identified the poly(rC)-binding protein 1 (PCBP1) as directly binding to amplifier. A PCBP1 consensus element was identified within the CFTR open reading frame that binds PCBP1. This sequence proved necessary for amplifier responsiveness. CONCLUSIONS Small molecule amplifiers co-translationally increase CFTR mRNA stability. They enhance translation through addressing the inherently inefficient membrane targeting of CFTR mRNA. Amplifiers bind directly to PCBP1, show enhanced affinity in the presence of bound RNA, and require a PCBP1 consensus element within CFTR mRNA to elicit translational effects. These modulators represent a promising new and mechanistically novel class of CFTR therapeutic. They may be useful as a monotherapy or in combination with other CFTR modulators.
Collapse
Affiliation(s)
- Danijela Dukovski
- Proteostasis Therapeutics, Inc., 80 Guest St, Suite 500, Boston, MA 02135, United States
| | - Adriana Villella
- Proteostasis Therapeutics, Inc., 80 Guest St, Suite 500, Boston, MA 02135, United States
| | - Cecilia Bastos
- Proteostasis Therapeutics, Inc., 80 Guest St, Suite 500, Boston, MA 02135, United States
| | - Randall King
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, United States
| | - Daniel Finley
- Department of Cell Biology, Harvard Medical School, Boston, MA 02115, United States
| | - Jeffery W Kelly
- Departments of Molecular Medicine and Chemistry, The Scripps Research Institute, La Jolla, CA 92037, United States
| | - Richard I Morimoto
- Department of Molecular Bioscience, Rice Institute for Biomedical Research, Northwestern University, Evanston, IL, United States
| | - F Ulrich Hartl
- Department of Cellular Biochemistry, Max Planck Institute of Biochemistry, Am Klopferspitz 18, D-82152 Martinsried, Germany
| | - Benito Munoz
- Proteostasis Therapeutics, Inc., 80 Guest St, Suite 500, Boston, MA 02135, United States
| | - Po-Shun Lee
- Proteostasis Therapeutics, Inc., 80 Guest St, Suite 500, Boston, MA 02135, United States
| | - Marija Zecevic
- Proteostasis Therapeutics, Inc., 80 Guest St, Suite 500, Boston, MA 02135, United States
| | - John Preston Miller
- Proteostasis Therapeutics, Inc., 80 Guest St, Suite 500, Boston, MA 02135, United States.
| |
Collapse
|
28
|
Euteneuer AM, Seeger‐Nukpezah T, Nolte H, Henjakovic M. Estrogen receptor α (ERα) indirectly induces transcription of human renal organic anion transporter 1 (OAT1). Physiol Rep 2019; 7:e14229. [PMID: 31724834 PMCID: PMC6854606 DOI: 10.14814/phy2.14229] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 08/20/2019] [Indexed: 01/05/2023] Open
Abstract
Organic anion transporter 1 (OAT1) is a polyspecific transport protein located in the basolateral membrane of renal proximal tubule cells. OAT1 plays a pivotal role in drug clearance. Adverse drug reactions (ADR) are observed more frequently in women than in men, especially ADR are higher in women for drugs which are known interactors of OAT1. Sex-dependent expression of Oat1 has been observed in rodents with a tendency to male-dominant expression. This study aims at elucidating the transcriptional regulation of human OAT1 and tests the effect of estrogen receptor α (ERα). Promoter activation of OAT1 was assessed by luciferase assays carried out by Opossum kidney (OK) cells, transiently transfected with promoter constructs of human OAT1 and expression vectors for ERα and exposed to 100 nmol/L 17β-estradiol. Furthermore, a transcription factor array and proteomic analysis was performed to identify estrogen-induced transcription factors. Human OAT1 was significantly activated by ligand activated ERα. However, activation occurred without a direct interaction of ERα with the OAT1 promoter. Our data rather show an activation of the transcription factors CCAAT-box-binding transcription factor (CBF) and heterogeneous nuclear ribonucleoprotein K (HNRNPK) by ERα, which in turn bind and initiate OAT1 promoter activity. Herewith, we provide novel evidence of estrogen-dependent, transcriptional regulation of polyspecific drug transporters including the estrogen-induced transcription factors CBF and HNRNPK.
Collapse
Affiliation(s)
- Anna M. Euteneuer
- Department I of Internal Medicine and Center for Integrated OncologyUniversity of CologneCologneGermany
| | - Tamina Seeger‐Nukpezah
- Department I of Internal Medicine and Center for Integrated OncologyUniversity of CologneCologneGermany
| | - Hendrik Nolte
- Institute of Genetics and Cologne Excellence Cluster on Cellular Stress Responses in Aging‐Associated Diseases (CECAD)University of CologneCologneGermany
| | - Maja Henjakovic
- Department I of Internal Medicine and Center for Integrated OncologyUniversity of CologneCologneGermany
| |
Collapse
|
29
|
Kazan HH, Urfali-Mamatoglu C, Yalcin GD, Bulut O, Sezer A, Banerjee S, Gunduz U. 15-LOX-1 has diverse roles in the resensitization of resistant cancer cell lines to doxorubicin. J Cell Physiol 2019; 235:4965-4978. [PMID: 31663148 DOI: 10.1002/jcp.29375] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 10/07/2019] [Indexed: 11/10/2022]
Abstract
Lipoxygenases (LOXs) are a family of enzymes that can oxygenate polyunsaturated fatty acids. As a member of the family, 15-lipoxygenase-1 (15-LOX-1) specifically metabolizes arachidonic acid and linoleic acid. 15-LOX-1 can affect physiological and pathophysiological events via regulation of the protein-lipid interactome, alterations in intracellular redox state and production of lipid metabolites that are involved in the induction and resolution of inflammation. Although several studies have shown that 15-LOX-1 has an antitumorigenic role in many different cancer models, including breast cancer, the role of the protein in cancer drug resistance has not been established yet. In this study, we, for the first time, aimed to show the potential role of 15-LOX-1 in acquired doxorubicin (DOX) resistance in MCF7 and HeLa cancer cell lines. Our results show that ALOX15 was transcriptionally downregulated in DOX-resistant cells compared with their drug-sensitive counterparts. Moreover, overexpression of ALOX15 in the drug-resistant cells resulted in resensitization of those cells to DOX in a cell-dependent manner. 15-LOX-1 expression could induce apoptosis by activating PPARγ and enhance the accumulation of DOX in drug-resistant MCF7 cells by altering cellular motility properties, and membrane dynamics. However, HeLa DOX cells did not show any of these effects but were susceptible to cell death when treated with 13(S)-HODE. These results underline the role and importance of 15-LOX-1 in cancer drug resistance, and points to novel mechanisms as a therapeutic approach to overcome cancer drug resistance.
Collapse
Affiliation(s)
- Hasan Huseyin Kazan
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
| | | | - Gizem Damla Yalcin
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
| | - Onur Bulut
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey.,Department of Molecular Biology and Genetics, Konya Food and Agriculture University, Konya, Turkey.,Research and Development Center for Diagnostic Kits (KIT-ARGEM), Konya Food and Agriculture University, Konya, Turkey
| | - Abdullah Sezer
- Department of Medical Genetics, Faculty of Medicine, Gazi University, Ankara, Turkey
| | - Sreeparna Banerjee
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
| | - Ufuk Gunduz
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
| |
Collapse
|
30
|
Nazarov IB, Bakhmet EI, Tomilin AN. KH-Domain Poly(C)-Binding Proteins as Versatile Regulators of Multiple Biological Processes. BIOCHEMISTRY (MOSCOW) 2019; 84:205-219. [PMID: 31221059 DOI: 10.1134/s0006297919030039] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Five known members of the family of KH-domain poly(C)-binding proteins (Pcbp1-4, hnRNP-K) have an unusually broad spectrum of cellular functions that include regulation of gene transcription, regulation of pre-mRNA processing, splicing, mRNA stability, translational silencing and enhancement, the control of iron turnover, and many others. Mechanistically, these proteins act via nucleic acid binding and protein-protein interactions. Through performing these multiple tasks, the KH-domain poly(C)-binding family members are involved in a wide variety of biological processes such as embryonic development, cell differentiation, and cancer. Deregulation of KH-domain protein expression is frequently associated with severe developmental defects and neoplasia. This review summarizes progress in studies of the KH-domain proteins made over past two decades. The review also reports our recent finding implying an involvement of the KH-factor Pcbp1 into control of transition from naïve to primed pluripotency cell state.
Collapse
Affiliation(s)
- I B Nazarov
- Institute of Cytology, Russian Academy of Sciences, St. Petersburg, 194064, Russia.
| | - E I Bakhmet
- Institute of Cytology, Russian Academy of Sciences, St. Petersburg, 194064, Russia
| | - A N Tomilin
- Institute of Cytology, Russian Academy of Sciences, St. Petersburg, 194064, Russia
| |
Collapse
|
31
|
Smirnova VV, Shestakova ED, Bikmetov DV, Chugunova AA, Osterman IA, Serebryakova MV, Sergeeva OV, Zatsepin TS, Shatsky IN, Terenin IM. eIF4G2 balances its own mRNA translation via a PCBP2-based feedback loop. RNA (NEW YORK, N.Y.) 2019; 25:757-767. [PMID: 31010886 PMCID: PMC6573783 DOI: 10.1261/rna.065623.118] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Accepted: 03/18/2019] [Indexed: 06/09/2023]
Abstract
Poly(rC)-binding protein 2 (PCBP2, hnRNP E2) is one of the most abundant RNA-binding proteins in mammalian cells. In humans, it exists in seven isoforms, which are assumed to play similar roles in cells. The protein is shown to bind 3'-untranslated regions (3'-UTRs) of many mRNAs and regulate their translation and/or stability, but nothing is known about the functional consequences of PCBP2 binding to 5'-UTRs. Here we show that the PCBP2 isoform f interacts with the 5'-UTRs of mRNAs encoding eIF4G2 (a translation initiation factor with a yet unknown mechanism of action, also known as DAP5) and Cyclin I, and inhibits their translation in vitro and in cultured cells, while the PCBP2 isoform e only affects Cyclin I translation. Furthermore, eIF4G2 participates in a cap-dependent translation of the PCBP2 mRNA. Thus, PCBP2 and eIF4G2 seem to regulate one another's expression via a novel type of feedback loop formed by the translation initiation factor and the RNA-binding protein.
Collapse
Affiliation(s)
- Victoria V Smirnova
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Leninskie Gory, 119234 Moscow, Russia
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory, Moscow 119992, Russia
| | - Ekaterina D Shestakova
- Department of Biochemistry, School of Biology, Lomonosov Moscow State University, Leninskie Gory, Moscow, 119234, Russian Federation
| | - Dmitry V Bikmetov
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Leninskie Gory, 119234 Moscow, Russia
| | - Anastasia A Chugunova
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
- Skolkovo Institute of Science and Technology, Skolkovo, Moscow Region 143026, Russia
| | - Ilya A Osterman
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory, Moscow 119992, Russia
- Chemistry Department, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia
- Skolkovo Institute of Science and Technology, Skolkovo, Moscow Region 143026, Russia
| | - Marina V Serebryakova
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory, Moscow 119992, Russia
| | - Olga V Sergeeva
- Skolkovo Institute of Science and Technology, Skolkovo, Moscow Region 143026, Russia
| | - Timofey S Zatsepin
- Skolkovo Institute of Science and Technology, Skolkovo, Moscow Region 143026, Russia
| | - Ivan N Shatsky
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory, Moscow 119992, Russia
| | - Ilya M Terenin
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Leninskie Gory, Moscow 119992, Russia
- Sechenov First Moscow State Medical University, Institute of Molecular Medicine, 119991, Moscow, Russian Federation
| |
Collapse
|
32
|
Jung Y, Ryu HG, Kim SW, Lee KH, Gu S, Yi H, Ku HO, Jang SK, Kim KT. The RNA-binding protein hnRNP Q represses translation of the clock gene Bmal1 in murine cells. J Biol Chem 2019; 294:7682-7691. [PMID: 30948510 PMCID: PMC6514626 DOI: 10.1074/jbc.ra118.006947] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 03/28/2019] [Indexed: 11/06/2022] Open
Abstract
Most living creatures have a circadian rhythm that is generated by a precisely regulated transcriptional-translational feedback loop of clock genes. Brain and muscle ARNT-like 1 (BMAL1) is one of the core clock genes and transcription factors that represents a positive arm of this autoregulatory circadian clock system. Despite the indispensable role of BMAL1 in the circadian rhythm, the molecular mechanisms underlying translational control of BMAL1 are largely unknown. Here, using murine NIH-3T3 cells, gene constructs, and a variety of biochemical approaches, including RNAi- and luciferase reporter gene-based assays, along with immunoblotting, in vitro transcription, quantitative real-time PCR, and real-time bioluminescence experiments, we show that translation of Bmal1 is negatively regulated by an RNA-binding protein, heterogeneous nuclear ribonucleoprotein Q (hnRNP Q). Interestingly, we found that hnRNP Q rhythmically binds to a specific region of the Bmal1 mRNA 5' UTR and controls its time-dependent expression. Moreover, we demonstrate that knockdown of hnRNP Q modulates BMAL1 protein oscillation amplitude without affecting mRNA rhythmic patterns. Furthermore, hnRNP Q depletion increases the mRNA oscillation amplitudes of BMAL1-regulated target genes. Together, our results suggest that hnRNP Q plays a pivotal role in both Bmal1 translation and BMAL1-regulated gene expression.
Collapse
Affiliation(s)
- Youngseob Jung
- From the Division of Integrative Biosciences and Biotechnology and
| | - Hye Guk Ryu
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Sung Wook Kim
- From the Division of Integrative Biosciences and Biotechnology and
| | - Kyung-Ha Lee
- the Division of Cosmetic Science and Technology, Daegu Haany University, Gyeongsan, Gyeongbuk 38610, Republic of Korea, and
| | - Sohyun Gu
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Hee Yi
- the Vet Drugs and Biologics Division, Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk 39660, Republic of Korea
| | - Hyun-Ok Ku
- the Vet Drugs and Biologics Division, Animal and Plant Quarantine Agency, Gimcheon, Gyeongbuk 39660, Republic of Korea
| | - Sung Key Jang
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Republic of Korea
| | - Kyong-Tai Kim
- From the Division of Integrative Biosciences and Biotechnology and
- Department of Life Sciences, Pohang University of Science and Technology, Pohang, Gyeongbuk 37673, Republic of Korea
| |
Collapse
|
33
|
Ostareck DH, Ostareck-Lederer A. RNA-Binding Proteins in the Control of LPS-Induced Macrophage Response. Front Genet 2019; 10:31. [PMID: 30778370 PMCID: PMC6369361 DOI: 10.3389/fgene.2019.00031] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 01/17/2019] [Indexed: 12/18/2022] Open
Abstract
Innate immune response is triggered by pathogen components, like lipopolysaccharides (LPS) of gram-negative bacteria. LPS initiates Toll-like receptor 4 (TLR4) signaling, which involves mitogen activated protein kinases (MAPK) and nuclear factor kappa B (NFκB) in different pathway branches and ultimately induces inflammatory cytokine and chemokine expression, macrophage migration and phagocytosis. Timely gene transcription and post-transcriptional control of gene expression confer the adequate synthesis of signaling molecules. As trans-acting factors RNA binding proteins (RBPs) contribute significantly to the surveillance of gene expression. RBPs are involved in the regulation of mRNA processing, localization, stability and translation. Thereby they enable rapid cellular responses to inflammatory mediators and facilitate a coordinated systemic immune response. Specific RBP binding to conserved sequence motifs in their target mRNAs is mediated by RNA binding domains, like Zink-finger domains, RNA recognition motifs (RRM), and hnRNP K homology domains (KH), often arranged in modular arrays. In this review, we focus on RBPs Tristetraprolin (TTP), human antigen R (HUR), T-cell intracellular antigen 1 related protein (TIAR), and heterogeneous ribonuclear protein K (hnRNP K) in LPS induced macrophages as primary responding immune cells. We discuss recent experiments employing RNA immunoprecipitation and microarray analysis (RIP-Chip) and newly developed individual-nucleotide resolution crosslinking and immunoprecipitation (iCLIP), photoactivatable ribonucleoside-enhanced crosslinking (PAR-iCLIP) and RNA sequencing techniques (RNA-Seq). The global mRNA interaction profile analysis of TTP, HUR, TIAR, and hnRNP K exhibited valuable information about the post-transcriptional control of inflammation related gene expression with a broad impact on intracellular signaling and temporal cytokine expression.
Collapse
Affiliation(s)
- Dirk H Ostareck
- Department of Intensive Care Medicine, University Hospital RWTH Aachen, Aachen, Germany
| | | |
Collapse
|
34
|
Shin CH, Kim HH. Functional roles of heterogeneous nuclear ribonucleoprotein K in post-transcriptional gene regulation. PRECISION AND FUTURE MEDICINE 2018. [DOI: 10.23838/pfm.2018.00107] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
|
35
|
Characterization of acute myeloid leukemia with del(9q) - Impact of the genes in the minimally deleted region. Leuk Res 2018; 76:15-23. [PMID: 30476680 DOI: 10.1016/j.leukres.2018.11.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 11/13/2018] [Accepted: 11/15/2018] [Indexed: 02/06/2023]
Abstract
Acute myeloid leukemia is an aggressive disease that arises from clonal expansion of malignant hematopoietic precursor cells of the bone marrow. Deletions on the long arm of chromosome 9 (del(9q)) are observed in 2% of acute myeloid leukemia patients. Our deletion analysis in a cohort of 31 del(9q) acute myeloid leukemia patients further supports the importance of a minimally deleted region composed of seven genes potentially involved in leukemogenesis: GKAP1, KIF27, C9ORF64, HNRNPK, RMI1, SLC28A3 and NTRK2. Importantly, among them HNRNPK, encoding heterogeneous nuclear ribonucleoprotein K is proposed to function in leukemogenesis. We show that expression of HNRNPK and the other genes of the minimally deleted region is significantly reduced in patients with del(9q) compared with normal karyotype acute myeloid leukemia. Also, two mRNAs interacting with heterogeneous nuclear ribonucleoprotein K, namely CDKN1A and CEBPA are significantly downregulated. While the deletion size is not correlated with outcome, associated genetic aberrations are important. Patients with an additional t(8;21) show a good prognosis. RUNX1-RUNX1T1, which emerges from the t(8;21) leads to transcriptional down-regulation of CEBPA. Acute myeloid leukemia patients with mutations in CEBPA have a good prognosis as well. Interestingly, in del(9q) patients with CEBPA mutation mRNA levels of HNRNPK and the other genes located in the minimally deleted region is restored to normal karyotype level. Our data indicate that a link between CEBPA and the genes of the minimally deleted region, among them HNRNPK contributes to leukemogenesis in acute myeloid leukemia with del(9q).
Collapse
|
36
|
Ghanem LR, Kromer A, Silverman IM, Ji X, Gazzara M, Nguyen N, Aguilar G, Martinelli M, Barash Y, Liebhaber SA. Poly(C)-Binding Protein Pcbp2 Enables Differentiation of Definitive Erythropoiesis by Directing Functional Splicing of the Runx1 Transcript. Mol Cell Biol 2018; 38:e00175-18. [PMID: 29866654 PMCID: PMC6066754 DOI: 10.1128/mcb.00175-18] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 05/10/2018] [Accepted: 05/26/2018] [Indexed: 12/14/2022] Open
Abstract
Formation of the mammalian hematopoietic system is under a complex set of developmental controls. Here, we report that mouse embryos lacking the KH domain poly(C) binding protein, Pcbp2, are selectively deficient in the definitive erythroid lineage. Compared to wild-type controls, transcript splicing analysis of the Pcbp2-/- embryonic liver reveals accentuated exclusion of an exon (exon 6) that encodes a highly conserved transcriptional control segment of the hematopoietic master regulator, Runx1. Embryos rendered homozygous for a Runx1 locus lacking this cassette exon (Runx1ΔE6) effectively phenocopy the loss of the definitive erythroid lineage in Pcbp2-/- embryos. These data support a model in which enhancement of Runx1 cassette exon 6 inclusion by Pcbp2 serves a critical role in development of hematopoietic progenitors and constitutes a critical step in the developmental pathway of the definitive erythropoietic lineage.
Collapse
Affiliation(s)
- Louis R Ghanem
- Gastroenterology, Hepatology and Nutrition Division, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Andrew Kromer
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Ian M Silverman
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Xinjun Ji
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Matthew Gazzara
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Nhu Nguyen
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Gabrielle Aguilar
- Gastroenterology, Hepatology and Nutrition Division, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Massimo Martinelli
- Gastroenterology, Hepatology and Nutrition Division, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Department of Translational Medical Science, Section of Pediatrics, University of Naples Federico II, Naples, Italy
| | - Yoseph Barash
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Stephen A Liebhaber
- Department of Genetics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
- Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania, USA
| |
Collapse
|
37
|
Howley BV, Howe PH. TGF-beta signaling in cancer: post-transcriptional regulation of EMT via hnRNP E1. Cytokine 2018; 118:19-26. [PMID: 29396052 DOI: 10.1016/j.cyto.2017.12.032] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 12/29/2017] [Indexed: 12/12/2022]
Abstract
The TGFβ signaling pathway is a critical regulator of cancer progression in part through induction of the epithelial to mesenchymal transition (EMT). This process is aberrantly activated in cancer cells, facilitating invasion of the basement membrane, survival in the circulatory system, and dissemination to distant organs. The mechanisms through which epithelial cells transition to a mesenchymal state involve coordinated transcriptional and post-transcriptional control of gene expression. One such mechanism of control is through the RNA binding protein hnRNP E1, which regulates splicing and translation of a cohort of EMT and stemness-associated transcripts. A growing body of evidence indicates a major role for hnRNP E1 in the control of epithelial cell plasticity, especially in the context of carcinoma progression. Here, we review the multiple mechanisms through which hnRNP E1 functions to control EMT and metastatic progression.
Collapse
Affiliation(s)
- Breege V Howley
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, USA; Hollings Cancer Center, Medical University of South Carolina, Charleston, SC, USA
| | - Philip H Howe
- Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, SC, USA; Hollings Cancer Center, Medical University of South Carolina, Charleston, SC, USA.
| |
Collapse
|
38
|
Yamashita A, Takeuchi O. Translational control of mRNAs by 3'-Untranslated region binding proteins. BMB Rep 2018; 50:194-200. [PMID: 28287067 PMCID: PMC5437963 DOI: 10.5483/bmbrep.2017.50.4.040] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Indexed: 12/31/2022] Open
Abstract
Eukaryotic gene expression is precisely regulated at all points between transcription and translation. In this review, we focus on translational control mediated by the 3′-untranslated regions (UTRs) of mRNAs. mRNA 3′-UTRs contain cis-acting elements that function in the regulation of protein translation or mRNA decay. Each RNA binding protein that binds to these cis-acting elements regulates mRNA translation via various mechanisms targeting the mRNA cap structure, the eukaryotic initiation factor 4E (eIF4E)-eIF4G complex, ribosomes, and the poly (A) tail. We also discuss translation-mediated regulation of mRNA fate.
Collapse
Affiliation(s)
- Akio Yamashita
- Department of Molecular Biology, Yokohama City University School of Medicine, Yokohama 236-0004, Japan
| | - Osamu Takeuchi
- Laboratory of Infection and Prevention, Institute for Frontier Life and Medical Sciences, Kyoto University, Kyoto 606-8507, Japan
| |
Collapse
|
39
|
Basu A, Jain N, Tolbert BS, Komar AA, Mazumder B. Conserved structures formed by heterogeneous RNA sequences drive silencing of an inflammation responsive post-transcriptional operon. Nucleic Acids Res 2018; 45:12987-13003. [PMID: 29069516 PMCID: PMC5727460 DOI: 10.1093/nar/gkx979] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 10/09/2017] [Indexed: 11/21/2022] Open
Abstract
RNA–protein interactions with physiological outcomes usually rely on conserved sequences within the RNA element. By contrast, activity of the diverse gamma-interferon-activated inhibitor of translation (GAIT)-elements relies on the conserved RNA folding motifs rather than the conserved sequence motifs. These elements drive the translational silencing of a group of chemokine (CC/CXC) and chemokine receptor (CCR) mRNAs, thereby helping to resolve physiological inflammation. Despite sequence dissimilarity, these RNA elements adopt common secondary structures (as revealed by 2D-1H NMR spectroscopy), providing a basis for their interaction with the RNA-binding GAIT complex. However, many of these elements (e.g. those derived from CCL22, CXCL13, CCR4 and ceruloplasmin (Cp) mRNAs) have substantially different affinities for GAIT complex binding. Toeprinting analysis shows that different positions within the overall conserved GAIT element structure contribute to differential affinities of the GAIT protein complex towards the elements. Thus, heterogeneity of GAIT elements may provide hierarchical fine-tuning of the resolution of inflammation.
Collapse
Affiliation(s)
- Abhijit Basu
- Center for Gene Regulation in Health & Disease, Department of Biology, Geology and Environmental Sciences, Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA
| | - Niyati Jain
- Department of Chemistry, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Blanton S Tolbert
- Department of Chemistry, Case Western Reserve University, Cleveland, OH 44106, USA
| | - Anton A Komar
- Center for Gene Regulation in Health & Disease, Department of Biology, Geology and Environmental Sciences, Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA
| | - Barsanjit Mazumder
- Center for Gene Regulation in Health & Disease, Department of Biology, Geology and Environmental Sciences, Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA
| |
Collapse
|
40
|
Gallardo M, Hornbaker MJ, Zhang X, Hu P, Bueso-Ramos C, Post SM. Aberrant hnRNP K expression: All roads lead to cancer. Cell Cycle 2017; 15:1552-7. [PMID: 27049467 DOI: 10.1080/15384101.2016.1164372] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
The classification of a gene as an oncogene or a tumor suppressor has been a staple of cancer biology for decades. However, as we delve deeper into the biology of these genes, this simple classification has become increasingly difficult for some. In the case of heterogeneous nuclear ribonuclear protein K (hnRNP K), its role as a tumor suppressor has recently been described in acute myeloid leukemia and demonstrated in a haploinsufficient mouse model. In contrast, data from other clinical correlation studies suggest that hnRNP K may be more fittingly described as an oncogene, due to its increased levels in a variety of malignancies. hnRNP K is a multifunctional protein that can regulate both oncogenic and tumor suppressive pathways through a bevy of chromatin-, DNA-, RNA-, and protein-mediated activates, suggesting its aberrant expression may have broad-reaching cellular impacts. In this review, we highlight our current understanding of hnRNP K, with particular emphasis on its apparently dichotomous roles in tumorigenesis.
Collapse
Affiliation(s)
- Miguel Gallardo
- a Department of Leukemia , The University of Texas, MD Anderson Cancer Center , Houston , TX , USA
| | - Marisa J Hornbaker
- a Department of Leukemia , The University of Texas, MD Anderson Cancer Center , Houston , TX , USA.,b The University of Texas Graduate School of Biomedical Sciences at Houston , Houston , TX , USA
| | - Xiaorui Zhang
- a Department of Leukemia , The University of Texas, MD Anderson Cancer Center , Houston , TX , USA
| | - Peter Hu
- c School of Health Professions, The University of Texas, MD Anderson Cancer Center , Houston , TX , USA
| | - Carlos Bueso-Ramos
- d Department of Hematopathology , The University of Texas, MD Anderson Cancer Center , Houston , TX , USA
| | - Sean M Post
- a Department of Leukemia , The University of Texas, MD Anderson Cancer Center , Houston , TX , USA
| |
Collapse
|
41
|
Tang YS, Khan RA, Xiao S, Hansen DK, Stabler SP, Kusumanchi P, Jayaram HN, Antony AC. Evidence Favoring a Positive Feedback Loop for Physiologic Auto Upregulation of hnRNP-E1 during Prolonged Folate Deficiency in Human Placental Cells. J Nutr 2017; 147:482-498. [PMID: 28250194 PMCID: PMC5368577 DOI: 10.3945/jn.116.241364] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 10/07/2016] [Accepted: 01/11/2017] [Indexed: 12/27/2022] Open
Abstract
Background: Previously, we determined that heterogeneous nuclear ribonucleoprotein E1 (hnRNP-E1) functions as an intracellular physiologic sensor of folate deficiency. In this model, l-homocysteine, which accumulates intracellularly in proportion to the extent of folate deficiency, covalently binds to and thereby activates homocysteinylated hnRNP-E1 to interact with folate receptor-α mRNA; this high-affinity interaction triggers the translational upregulation of cell surface folate receptors, which enables cells to optimize folate uptake from the external milieu. However, integral to this model is the need for ongoing generation of hnRNP-E1 to replenish homocysteinylated hnRNP-E1 that is degraded.Objective: We searched for an interrelated physiologic mechanism that could also maintain the steady-state concentration of hnRNP-E1 during prolonged folate deficiency.Methods: A novel RNA-protein interaction was functionally characterized by using molecular and biochemical approaches in vitro and in vivo.Results: l-homocysteine triggered a dose-dependent high-affinity interaction between hnRNP-E1 and a 25-nucleotide cis element within the 5'-untranslated region of hnRNP-E1 mRNA; this led to a proportionate increase in these RNA-protein complexes, and translation of hnRNP-E1 both in vitro and within placental cells. Targeted perturbation of this RNA-protein interaction either by specific 25-nucleotide antisense oligonucleotides or mutation within this cis element or by small interfering RNA to hnRNP-E1 mRNA significantly reduced cellular biosynthesis of hnRNP-E1. Conversely, transfection of hnRNP-E1 mutant proteins that mimicked homocysteinylated hnRNP-E1 stimulated both cellular hnRNP-E1 and folate receptor biosynthesis. In addition, ferrous sulfate heptahydrate [iron(II)], which also binds hnRNP-E1, significantly perturbed this l-homocysteine-triggered RNA-protein interaction in a dose-dependent manner. Finally, folate deficiency induced dual upregulation of hnRNP-E1 and folate receptors in cultured human cells and tumor xenografts, and more selectively in various fetal tissues of folate-deficient dams.Conclusions: This novel positive feedback loop amplifies hnRNP-E1 during prolonged folate deficiency and thereby maximizes upregulation of folate receptors in order to restore folate homeostasis toward normalcy in placental cells. It will also functionally impact several other mRNAs of the nutrition-sensitive, folate-responsive posttranscriptional RNA operon that is orchestrated by homocysteinylated hnRNP-E1.
Collapse
Affiliation(s)
- Ying-Sheng Tang
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN
| | - Rehana A Khan
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN
| | - Suhong Xiao
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN
| | | | - Sally P Stabler
- Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO; and
| | - Praveen Kusumanchi
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN
| | | | - Aśok C Antony
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN; .,Richard L Roudebush Veterans Affairs Medical Center, Indianapolis, IN
| |
Collapse
|
42
|
Proteomic Analysis of Fetal Ovaries Reveals That Primordial Follicle Formation and Transition Are Differentially Regulated. BIOMED RESEARCH INTERNATIONAL 2017; 2017:6972030. [PMID: 28265575 PMCID: PMC5318639 DOI: 10.1155/2017/6972030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2016] [Revised: 12/14/2016] [Accepted: 01/04/2017] [Indexed: 11/17/2022]
Abstract
Primordial follicle formation represents a critical phase of the initiation of embryonic reproductive organ development, while the primordial follicle transition into primary follicle determines whether oestrus or ovulation will occur in female animals. To identify molecular mechanism of new proteins which are involved in ovarian development, we employed 2D-DIGE to compare the protein expression profiles of primordial follicles and primary follicles of fetal ovaries in pigs. Fetal ovaries were collected at distinct time-points of the gestation cycle (g55 and g90). The identified proteins at the g55 time-point are mainly involved in the development of anatomical structures [reticulocalbin-1 (RCN1), reticulocalbin-3 (RCN3)], cell differentiation (actin), and stress response [heterogeneous nuclear ribonucleoprotein K (HNRNPK)]. Meanwhile, at the g90 stage, the isolated proteins with altered expression levels were mainly associated with cell proliferation [major vault protein (MVP)] and stress response [heat shock-related 70 kDa protein 2 (HSPA2)]. In conclusion, our work revealed that primordial follicle formation is regulated by RCN1, RCN3, actin, and HNRNPK, while the primordial follicle transformation to primary follicle is regulated by MVP and HSPA2. Therefore, our results provide further information for the prospective understanding of the molecular mechanism(s) involved in the regulation of the ovarian follicle development.
Collapse
|
43
|
Jang S, Shin H, Lee J, Kim Y, Bak G, Lee Y. Regulation of BC200 RNA-mediated translation inhibition by hnRNP E1 and E2. FEBS Lett 2017; 591:393-405. [PMID: 28027391 DOI: 10.1002/1873-3468.12544] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Revised: 12/21/2016] [Accepted: 12/21/2016] [Indexed: 12/28/2022]
Abstract
The long noncoding RNA BC200 (brain cytoplasmic RNA, 200 nucleotides) acts as a translational modulator of local protein synthesis at dendrites. BC200 RNA has been shown to inhibit translation in vitro, but it remains unknown how this translation inhibition might be controlled in a cell. Here, we performed yeast three-hybrid screening and identified hnRNP E1 and hnRNP E2 as BC200 RNA-interacting proteins. We found that: these hnRNA proteins could restore BC200 RNA-inhibited translation; BC200 RNA interacts with hnRNP E1 and E2 mainly through its unique 3' C-rich domain; and the RNA binding specificities and modes of the two proteins differed somewhat. Our results offer new insights into the regulation of BC200 RNA-mediated translation inhibition.
Collapse
Affiliation(s)
| | | | - Jungmin Lee
- Department of Chemistry, KAIST, Daejeon, Korea
| | - Youngmi Kim
- Department of Chemistry, KAIST, Daejeon, Korea
| | - Geunu Bak
- Department of Chemistry, KAIST, Daejeon, Korea
| | | |
Collapse
|
44
|
Hunkele A, Sultan H, Ikalina FA, Liu AH, Nahar-Gohad P, Ko JL. Identification of gamma-synuclein as a new PCBP1-interacting protein. Neurol Res 2016; 38:1064-1078. [PMID: 26344801 DOI: 10.1179/1743132815y.0000000091] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
OBJECTIVES PolyC binding protein 1 (PCBP1) is a transcriptional regulator of human mu-opioid receptor (hMOR) gene in the CNS and is also related to cancer/diseases. It possesses multi-roles that can be mediated by protein-protein interactions. To understand the mechanism controlling PCBP1 functions, PCBP1-interacting protein was investigated. METHODS Using PCBP1 as the bait, a human brain cDNA library was screened via two-hybrid system. DNA sequence of candidate protein was confirmed using NCBI/SNP databases. Candidate protein in various cell lines was examined by RT-PCR. Glutathione-S-transferase (GST) pull-down and co-immunoprecipitation were used to validate the physical interaction. Its effects on hMOR gene regulation were examined. RESULTS One clone was identified as gamma-synuclein110E, an SNP of gamma-synuclein110V. The interaction between PCBP1 and gamma-synuclein110E was confirmed by further validation and GST pull-down assay. Confocal analysis showed gamma-synuclein110E mainly expressing in the cytosol of human neuronal NMB cells. This interaction was confirmed by co-immunoprecipitation with NMB lysates, containing both proteins endogenously. Ectopic expression of gamma-synuclein110E or 110V did not alter hMOR mRNA level or promoter activity, suggesting no involvement of gamma-synuclein in modulating hMOR expression. Co-immunoprecipitation using gamma-synuclein110E or 110V overexpressed NMB cells with anti-PCBP1 antibody revealed a stronger intensity of co-immunoprecipitated gamma-synuclein band using gamma-synuclein110E-overexpressed cells as compared to that using gamma-synuclein110V-overexpressed cells. Synuclein110E was also identified in H292 (lung), HT29 (colon) and T47D (breast) cells, and this physical interaction was confirmed. CONCLUSION We report a newly identified PCBP1-interacting protein, gamma-synuclein110E, and provide some insight into its complex role as well as discuss potential roles of this interaction.
Collapse
Affiliation(s)
- Amanda Hunkele
- a Department of Biological Sciences ; Seton Hall University , USA
| | - Hamidah Sultan
- a Department of Biological Sciences ; Seton Hall University , USA
| | - Faith A Ikalina
- a Department of Biological Sciences ; Seton Hall University , USA
| | - Alexander H Liu
- a Department of Biological Sciences ; Seton Hall University , USA
| | | | - Jane L Ko
- a Department of Biological Sciences ; Seton Hall University , USA
| |
Collapse
|
45
|
Kawasaki Y, Komiya M, Matsumura K, Negishi L, Suda S, Okuno M, Yokota N, Osada T, Nagashima T, Hiyoshi M, Okada-Hatakeyama M, Kitayama J, Shirahige K, Akiyama T. MYU, a Target lncRNA for Wnt/c-Myc Signaling, Mediates Induction of CDK6 to Promote Cell Cycle Progression. Cell Rep 2016; 16:2554-2564. [PMID: 27568568 DOI: 10.1016/j.celrep.2016.08.015] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Revised: 06/06/2016] [Accepted: 08/05/2016] [Indexed: 01/05/2023] Open
Abstract
Aberrant activation of Wnt/β-catenin signaling is a major driving force in colon cancer. Wnt/β-catenin signaling induces the expression of the transcription factor c-Myc, leading to cell proliferation and tumorigenesis. c-Myc regulates multiple biological processes through its ability to directly modulate gene expression. Here, we identify a direct target of c-Myc, termed MYU, and show that MYU is upregulated in most colon cancers and required for the tumorigenicity of colon cancer cells. Furthermore, we demonstrate that MYU associates with the RNA binding protein hnRNP-K to stabilize CDK6 expression and thereby promotes the G1-S transition of the cell cycle. These results suggest that the MYU/hnRNP-K/CDK6 pathway functions downstream of Wnt/c-Myc signaling and plays a critical role in the proliferation and tumorigenicity of colon cancer cells.
Collapse
Affiliation(s)
- Yoshihiro Kawasaki
- Laboratory of Molecular and Genetic Information, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
| | - Mimon Komiya
- Laboratory of Molecular and Genetic Information, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Kosuke Matsumura
- Laboratory of Molecular and Genetic Information, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Lumi Negishi
- Laboratory of Molecular and Genetic Information, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Sakiko Suda
- Laboratory of Molecular and Genetic Information, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Masumi Okuno
- Laboratory of Molecular and Genetic Information, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Naoko Yokota
- Research Center for Epigenetic Disease, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Tomoya Osada
- Laboratory of Molecular and Genetic Information, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Takeshi Nagashima
- Laboratory for Cellular Systems Modeling, RIKEN Research Center for Allergy and Immunology, 1-7-22, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Masaya Hiyoshi
- Department of Surgical Oncology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Mariko Okada-Hatakeyama
- Laboratory for Cellular Systems Modeling, RIKEN Research Center for Allergy and Immunology, 1-7-22, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Joji Kitayama
- Department of Surgical Oncology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8655, Japan
| | - Katsuhiko Shirahige
- Research Center for Epigenetic Disease, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
| | - Tetsu Akiyama
- Laboratory of Molecular and Genetic Information, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
| |
Collapse
|
46
|
Liao Y, Castello A, Fischer B, Leicht S, Föehr S, Frese CK, Ragan C, Kurscheid S, Pagler E, Yang H, Krijgsveld J, Hentze MW, Preiss T. The Cardiomyocyte RNA-Binding Proteome: Links to Intermediary Metabolism and Heart Disease. Cell Rep 2016; 16:1456-1469. [PMID: 27452465 PMCID: PMC4977271 DOI: 10.1016/j.celrep.2016.06.084] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 04/06/2016] [Accepted: 06/07/2016] [Indexed: 11/30/2022] Open
Abstract
RNA functions through the dynamic formation of complexes with RNA-binding proteins (RBPs) in all clades of life. We determined the RBP repertoire of beating cardiomyocytic HL-1 cells by jointly employing two in vivo proteomic methods, mRNA interactome capture and RBDmap. Together, these yielded 1,148 RBPs, 391 of which are shared with all other available mammalian RBP repertoires, while 393 are thus far unique to cardiomyocytes. RBDmap further identified 568 regions of RNA contact within 368 RBPs. The cardiomyocyte mRNA interactome composition reflects their unique biology. Proteins with roles in cardiovascular physiology or disease, mitochondrial function, and intermediary metabolism are all highly represented. Notably, we identified 73 metabolic enzymes as RBPs. RNA-enzyme contacts frequently involve Rossmann fold domains with examples in evidence of both, mutual exclusivity of, or compatibility between RNA binding and enzymatic function. Our findings raise the prospect of previously hidden RNA-mediated regulatory interactions among cardiomyocyte gene expression, physiology, and metabolism. mRNA interactome capture and RBDmap reveal the cardiomyocyte RNA-binding proteome 1,148 RBPs are identified, 393 of which are thus far unique to cardiomyocytes Many cardiac RBPs have links to heart disease and mitochondrial metabolism Contacts of metabolic enzymes with RNA frequently involve Rossmann fold domains
Collapse
Affiliation(s)
- Yalin Liao
- EMBL-Australia Collaborating Group, Department of Genome Sciences, The John Curtin School of Medical Research (JCSMR), The Australian National University, Acton (Canberra) ACT 2601, Australia
| | - Alfredo Castello
- European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Bernd Fischer
- European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Stefan Leicht
- European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Sophia Föehr
- European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Christian K Frese
- European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Chikako Ragan
- EMBL-Australia Collaborating Group, Department of Genome Sciences, The John Curtin School of Medical Research (JCSMR), The Australian National University, Acton (Canberra) ACT 2601, Australia
| | - Sebastian Kurscheid
- EMBL-Australia Collaborating Group, Department of Genome Sciences, The John Curtin School of Medical Research (JCSMR), The Australian National University, Acton (Canberra) ACT 2601, Australia
| | - Eloisa Pagler
- EMBL-Australia Collaborating Group, Department of Genome Sciences, The John Curtin School of Medical Research (JCSMR), The Australian National University, Acton (Canberra) ACT 2601, Australia
| | - Hao Yang
- EMBL-Australia Collaborating Group, Department of Genome Sciences, The John Curtin School of Medical Research (JCSMR), The Australian National University, Acton (Canberra) ACT 2601, Australia
| | - Jeroen Krijgsveld
- European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Matthias W Hentze
- European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany
| | - Thomas Preiss
- EMBL-Australia Collaborating Group, Department of Genome Sciences, The John Curtin School of Medical Research (JCSMR), The Australian National University, Acton (Canberra) ACT 2601, Australia; Victor Chang Cardiac Research Institute, Darlinghurst (Sydney), NSW 2010, Australia.
| |
Collapse
|
47
|
Geuens T, Bouhy D, Timmerman V. The hnRNP family: insights into their role in health and disease. Hum Genet 2016; 135:851-67. [PMID: 27215579 PMCID: PMC4947485 DOI: 10.1007/s00439-016-1683-5] [Citation(s) in RCA: 659] [Impact Index Per Article: 82.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 05/09/2016] [Indexed: 12/14/2022]
Abstract
Heterogeneous nuclear ribonucleoproteins (hnRNPs) represent a large family of RNA-binding proteins (RBPs) that contribute to multiple aspects of nucleic acid metabolism including alternative splicing, mRNA stabilization, and transcriptional and translational regulation. Many hnRNPs share general features, but differ in domain composition and functional properties. This review will discuss the current knowledge about the different hnRNP family members, focusing on their structural and functional divergence. Additionally, we will highlight their involvement in neurodegenerative diseases and cancer, and the potential to develop RNA-based therapies.
Collapse
Affiliation(s)
- Thomas Geuens
- Peripheral Neuropathy Group, VIB Molecular Genetics Department, University of Antwerp-CDE, Parking P4, Building V, Room 1.30, Universiteitsplein 1, 2610, Antwerp, Belgium
- Neurogenetics Laboratory, Institute Born Bunge, University of Antwerp, Antwerp, Belgium
| | - Delphine Bouhy
- Peripheral Neuropathy Group, VIB Molecular Genetics Department, University of Antwerp-CDE, Parking P4, Building V, Room 1.30, Universiteitsplein 1, 2610, Antwerp, Belgium
- Neurogenetics Laboratory, Institute Born Bunge, University of Antwerp, Antwerp, Belgium
| | - Vincent Timmerman
- Peripheral Neuropathy Group, VIB Molecular Genetics Department, University of Antwerp-CDE, Parking P4, Building V, Room 1.30, Universiteitsplein 1, 2610, Antwerp, Belgium.
- Neurogenetics Laboratory, Institute Born Bunge, University of Antwerp, Antwerp, Belgium.
| |
Collapse
|
48
|
Yan W, Scoumanne A, Jung YS, Xu E, Zhang J, Zhang Y, Ren C, Sun P, Chen X. Mice deficient in poly(C)-binding protein 4 are susceptible to spontaneous tumors through increased expression of ZFP871 that targets p53 for degradation. Genes Dev 2016; 30:522-34. [PMID: 26915821 PMCID: PMC4782047 DOI: 10.1101/gad.271890.115] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 01/26/2016] [Indexed: 01/06/2023]
Abstract
Poly(C)-binding protein 4 (PCBP4), also called MCG10 and a target of p53, plays a role in the cell cycle and is implicated in lung tumor suppression. Here, we found that PCBP4-deficient mice are prone to lung adenocarcinoma, lymphoma, and kidney tumor and that PCBP4-deficient mouse embryo fibroblasts (MEFs) exhibit enhanced cell proliferation but decreased cellular senescence. We also found that p53 expression is markedly reduced in PCBP4-deficient MEFs and mouse tissues, suggesting that PCBP4 in turn regulates p53 expression. To determine how PCBP4 regulates p53 expression, PCBP4 targets were identified by RNA immunoprecipitation followed by RNA sequencing (RNA-seq). We found that the transcript encoding ZFP871 (zinc finger protein 871; also called ZNF709 in humans) interacts with and is regulated by PCBP4 via mRNA stability. Additionally, we found that ZFP871 physically interacts with p53 and MDM2 proteins. Consistently, ectopic expression of ZFP871 decreases-whereas knockdown of ZFP871 increases-p53 protein stability through a proteasome-dependent degradation pathway. Moreover, loss of ZFP871 reverses the reduction of p53 expression by lack of PCBP4, and thus increased expression of ZFP871 is responsible for decreased expression of p53 in the PCBP4-deficient MEFs and mouse tissues. Interestingly, we found that, like PCBP4, ZFP871 is also regulated by DNA damage and p53. Finally, we showed that knockdown of ZFP871 markedly enhances p53 expression, leading to growth suppression and apoptosis in a p53-dependent manner. Thus, the p53-PCBP4-ZFP871 axis represents a novel feedback loop in the p53 pathway. Together, we hypothesize that PCBP4 is a potential tissue-specific tumor suppressor and that ZFP871 is part of MDM2 and possibly other ubiquitin E3 ligases that target p53 for degradation.
Collapse
Affiliation(s)
- Wensheng Yan
- Comparative Oncology Laboratory, School of Veterinary Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA
| | - Ariane Scoumanne
- Comparative Oncology Laboratory, School of Veterinary Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA
| | - Yong-Sam Jung
- Comparative Oncology Laboratory, School of Veterinary Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA
| | - Enshun Xu
- Comparative Oncology Laboratory, School of Veterinary Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA
| | - Jin Zhang
- Comparative Oncology Laboratory, School of Veterinary Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA
| | - Yanhong Zhang
- Comparative Oncology Laboratory, School of Veterinary Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA
| | - Cong Ren
- Comparative Oncology Laboratory, School of Veterinary Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA
| | - Pei Sun
- Comparative Oncology Laboratory, School of Veterinary Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA
| | - Xinbin Chen
- Comparative Oncology Laboratory, School of Veterinary Medicine, School of Medicine, University of California at Davis, Davis, California 95616, USA
| |
Collapse
|
49
|
Zhang P, Wang N, Lin X, Jin L, Xu H, Li R, Huang H. Expression and localization of heterogeneous nuclear ribonucleoprotein K in mouse ovaries and preimplantation embryos. Biochem Biophys Res Commun 2016; 471:260-5. [PMID: 26850853 DOI: 10.1016/j.bbrc.2016.02.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 02/01/2016] [Indexed: 01/08/2023]
Abstract
Heterogeneous nuclear ribonucleoprotein K (hnRNP K), an evolutionarily conserved protein, is involved in several important cellular processes that are relevant to cell proliferation, differentiation, apoptosis, and cancer development. However, details of hnRNP K expression during mammalian oogenesis and preimplantation embryo development are lacking. The present study investigates the expression and cellular localization of K protein in the mouse ovaries and preimplantation embryos using immunostaining. We demonstrate, for the first time, that hnRNP K is abundantly expressed in the nuclei of mouse oocytes in primordial, primary and secondary follicles. In germ vesicle (GV)-stage oocytes, hnRNP K accumulates in the germinal vesicle in a spot distribution manner. After germinal vesicle breakdown, speckled hnRNP K is diffusely distributed in the cytoplasm. However, after fertilization, the K protein relocates into the female and male pronucleus and persists in the blastomere nuclei. Localization of K protein in the human ovary and ovarian granulosa cell tumor (GCT) was also investigated. Overall, this study provides important morphological evidence to better understand the possible roles of hnRNP K in mammalian oogenesis and early embryo development.
Collapse
Affiliation(s)
- Ping Zhang
- The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Ningling Wang
- Department of Assisted Reproduction, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Xianhua Lin
- The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Li Jin
- The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Hong Xu
- The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
| | - Rong Li
- The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Hefeng Huang
- The International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
| |
Collapse
|
50
|
Naarmann-de Vries IS, Brendle A, Bähr-Ivacevic T, Benes V, Ostareck DH, Ostareck-Lederer A. Translational control mediated by hnRNP K links NMHC IIA to erythroid enucleation. J Cell Sci 2016; 129:1141-54. [PMID: 26823606 DOI: 10.1242/jcs.174995] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 01/20/2016] [Indexed: 12/20/2022] Open
Abstract
Post-transcriptional regulation is crucial for structural and functional alterations in erythropoiesis. Enucleation of erythroid progenitors precedes reticulocyte release into circulation. In enucleated cells, reticulocyte 15-lipoxygenase (r15-LOX, also known as ALOX15) initiates mitochondria degradation. Regulation of r15-LOX mRNA translation by hnRNP K determines timely r15-LOX synthesis in terminal maturation. K562 cells induced for erythroid maturation recapitulate enucleation and mitochondria degradation. HnRNP K depletion from maturing K562 cells results in enhanced enucleation, which even occurs independently of maturation. We performed RIP-Chip analysis to identify hnRNP K-interacting RNAs comprehensively. Non-muscle myosin heavy chain (NMHC) IIA (also known as MYH9) mRNA co-purified with hnRNP K from non-induced K562 cells, but not from mature cells. NMHC IIA protein increase in erythroid maturation at constant NMHC IIA mRNA levels indicates post-transcriptional regulation. We demonstrate that binding of hnRNP K KH domain 3 to a specific sequence element in the NMHC IIA mRNA 3'UTR mediates translation regulation in vitro Importantly, elevated NMHC IIA expression results in erythroid-maturation-independent enucleation as shown for hnRNP K depletion. Our data provide evidence that hnRNP-K-mediated regulation of NMHC IIA mRNA translation contributes to the control of enucleation in erythropoiesis.
Collapse
Affiliation(s)
- Isabel S Naarmann-de Vries
- Department of Intensive Care and Intermediate Care, Experimental Research Unit, University Hospital, RWTH Aachen University, Pauwelsstrasse 30, Aachen 52074, Germany
| | - Annika Brendle
- Department of Intensive Care and Intermediate Care, Experimental Research Unit, University Hospital, RWTH Aachen University, Pauwelsstrasse 30, Aachen 52074, Germany
| | - Tomi Bähr-Ivacevic
- Genomics Core Facility, EMBL, Meyerhofstraße 1, Heidelberg 69117, Germany
| | - Vladimir Benes
- Genomics Core Facility, EMBL, Meyerhofstraße 1, Heidelberg 69117, Germany
| | - Dirk H Ostareck
- Department of Intensive Care and Intermediate Care, Experimental Research Unit, University Hospital, RWTH Aachen University, Pauwelsstrasse 30, Aachen 52074, Germany
| | - Antje Ostareck-Lederer
- Department of Intensive Care and Intermediate Care, Experimental Research Unit, University Hospital, RWTH Aachen University, Pauwelsstrasse 30, Aachen 52074, Germany
| |
Collapse
|