1
|
Liu J, Liu M, Xiong F, Xu K, Pu Y, Huang J, Zhang J, Yin L, Pu Y, Sun R. Effects of glyphosate exposure on the miRNA expression profile and construction of the miRNA-mRNA regulatory network in mouse bone marrow cells. Funct Integr Genomics 2022; 23:22. [PMID: 36572786 DOI: 10.1007/s10142-022-00939-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 12/11/2022] [Accepted: 12/12/2022] [Indexed: 12/28/2022]
Affiliation(s)
- Jinyan Liu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China
| | - Manman Liu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China
| | - Fei Xiong
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China
| | - Kai Xu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China
| | - Yunqiu Pu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China
| | - Jiawei Huang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China
| | - Juan Zhang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China
| | - Lihong Yin
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China
| | - Yuepu Pu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China
| | - Rongli Sun
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Jiangsu, 210009, Nanjing, China.
| |
Collapse
|
2
|
Hu Y, Gao J, Wang M, Li M. Potential Prospect of CDK4/6 Inhibitors in Triple-Negative Breast Cancer. Cancer Manag Res 2021; 13:5223-5237. [PMID: 34234565 PMCID: PMC8257068 DOI: 10.2147/cmar.s310649] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Accepted: 06/03/2021] [Indexed: 12/31/2022] Open
Abstract
Triple-negative breast cancer (TNBC) is an aggressive, difficult-to-treat subtype of cancer with a poor prognosis; there is an urgent need for effective, targeted molecular therapies. The cyclin D/cyclin-dependent kinase (CDK)4/6–retinoblastoma protein (Rb) pathway plays a critical role in regulating cell cycle checkpoints, a process which is often disrupted in cancer cells. Selective CDK4/6 inhibitors can prevent retinoblastoma protein phosphorylation by invoking cell cycle arrest in the first growth phase (G1), and may therefore represent an effective treatment option. In this article, we review the molecular mechanisms and therapeutic efficacy of CDK4/6 inhibitors in combination with other targeted therapies for the treatment of triple-negative breast cancer. Three selective CDK4/6 inhibitors have so far received the approval of the Food and Drug Administration (FDA) for patients with estrogen receptor (ER)+/human epidermal growth factor receptor 2 (HER2) breast cancer. Trilaciclib, a small molecule short-acting inhibitor of CDK4/6, has also been approved recently for people with small cell lung cancer, and is also expected to be clinically effective against breast cancer. Although the efficacy of CDK4/6 inhibitors in patients with triple-negative breast cancer remains uncertain, their use in conjunction with other targeted therapies may improve outcomes and is therefore currently being explored. Identifying biomarkers for response or resistance to CDK4/6 inhibitor treatment may optimize the personalization of treatment strategies for this disease. Ongoing and future clinical trials and biomarker studies will shed further light on these topics, and help to realize the full potential of CDK4/6 inhibitor treatment in triple-negative breast cancer.
Collapse
Affiliation(s)
- Ye Hu
- Department of Oncology & Department of Breast Surgery, The Second Hospital of Dalian Medical University, Dalian, People's Republic of China
| | - Jiyue Gao
- Department of Oncology & Department of Breast Surgery, The Second Hospital of Dalian Medical University, Dalian, People's Republic of China
| | - Meiling Wang
- Department of Oncology & Department of Breast Surgery, The Second Hospital of Dalian Medical University, Dalian, People's Republic of China
| | - Man Li
- Department of Oncology & Department of Breast Surgery, The Second Hospital of Dalian Medical University, Dalian, People's Republic of China
| |
Collapse
|
3
|
Crist AM, Hinkle KM, Wang X, Moloney CM, Matchett BJ, Labuzan SA, Frankenhauser I, Azu NO, Liesinger AM, Lesser ER, Serie DJ, Quicksall ZS, Patel TA, Carnwath TP, DeTure M, Tang X, Petersen RC, Duara R, Graff-Radford NR, Allen M, Carrasquillo MM, Li H, Ross OA, Ertekin-Taner N, Dickson DW, Asmann YW, Carter RE, Murray ME. Transcriptomic analysis to identify genes associated with selective hippocampal vulnerability in Alzheimer's disease. Nat Commun 2021; 12:2311. [PMID: 33875655 PMCID: PMC8055900 DOI: 10.1038/s41467-021-22399-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 03/03/2021] [Indexed: 12/14/2022] Open
Abstract
Selective vulnerability of different brain regions is seen in many neurodegenerative disorders. The hippocampus and cortex are selectively vulnerable in Alzheimer's disease (AD), however the degree of involvement of the different brain regions differs among patients. We classified corticolimbic patterns of neurofibrillary tangles in postmortem tissue to capture extreme and representative phenotypes. We combined bulk RNA sequencing with digital pathology to examine hippocampal vulnerability in AD. We identified hippocampal gene expression changes associated with hippocampal vulnerability and used machine learning to identify genes that were associated with AD neuropathology, including SERPINA5, RYBP, SLC38A2, FEM1B, and PYDC1. Further histologic and biochemical analyses suggested SERPINA5 expression is associated with tau expression in the brain. Our study highlights the importance of embracing heterogeneity of the human brain in disease to identify disease-relevant gene expression.
Collapse
Affiliation(s)
- Angela M Crist
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | - Kelly M Hinkle
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | - Xue Wang
- Department of Health Sciences Research, Mayo Clinic, Jacksonville, FL, USA
| | | | | | | | - Isabelle Frankenhauser
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
- Paracelsus Medical Private University, Salzburg, Austria
| | - Nkem O Azu
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | | | - Elizabeth R Lesser
- Department of Health Sciences Research, Mayo Clinic, Jacksonville, FL, USA
| | - Daniel J Serie
- Department of Health Sciences Research, Mayo Clinic, Jacksonville, FL, USA
| | | | - Tulsi A Patel
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | - Troy P Carnwath
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | - Michael DeTure
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | - Xiaojia Tang
- Department of Health Sciences Research, Mayo Clinic, Rochester, MN, USA
| | | | - Ranjan Duara
- Wien Center for Alzheimer's Disease and Memory Disorders, Mount Sinai Medical Center, Miami Beach, FL, USA
| | | | - Mariet Allen
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | | | - Hu Li
- Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic, Rochester, MN, USA
| | - Owen A Ross
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | - Nilüfer Ertekin-Taner
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
- Department of Neurology, Mayo Clinic, Jacksonville, FL, USA
| | | | - Yan W Asmann
- Department of Health Sciences Research, Mayo Clinic, Jacksonville, FL, USA
| | - Rickey E Carter
- Department of Health Sciences Research, Mayo Clinic, Jacksonville, FL, USA
| | | |
Collapse
|
4
|
Low DEDD expression in breast cancer cells indicates higher sensitivity to the Bcl-2-specific inhibitor ABT-199. Biochem Biophys Res Commun 2020; 525:549-556. [PMID: 32113682 DOI: 10.1016/j.bbrc.2020.02.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 02/20/2020] [Accepted: 02/20/2020] [Indexed: 12/24/2022]
Abstract
As a proapoptotic death effect domain (DED)-containing protein, DED-containing DNA-binding protein (DEDD) has been demonstrated to inhibit tumor growth, invasion and metastasis in our previous studies. Here, we demonstrated that knockdown of DEDD in MCF-7 cells resulted in characteristic drug resistance to doxorubicin and paclitaxel, and overexpression of DEDD in MDA-MB-231 cells increased their sensitivity to doxorubicin and paclitaxel. The expression levels of DEDD were positively correlated with Bcl-2 in breast cancer cell lines as well as in human breast cancer tissue. Knockdown of DEDD downregulated the transcriptional activity of the bcl-2 gene and shortened the time for Bcl-2 degradation. DEDD interacts with and stabilizes Bcl-2, and breast cancer cells with low DEDD expression were more sensitive to treatment with a BH3 mimetic, ABT-199, than were those with high DEDD expression. In total, our findings highlight a new strategy for treating breast cancer with no/low DEDD expression by targeting Bcl-2 with the BH3 mimetic ABT-199.
Collapse
|
5
|
Death effector domain-containing protein induces vulnerability to cell cycle inhibition in triple-negative breast cancer. Nat Commun 2019; 10:2860. [PMID: 31253784 PMCID: PMC6599020 DOI: 10.1038/s41467-019-10743-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 05/30/2019] [Indexed: 02/07/2023] Open
Abstract
Lacking targetable molecular drivers, triple-negative breast cancer (TNBC) is the most clinically challenging subtype of breast cancer. In this study, we reveal that Death Effector Domain-containing DNA-binding protein (DEDD), which is overexpressed in > 60% of TNBCs, drives a mitogen-independent G1/S cell cycle transition through cytoplasm localization. The gain of cytosolic DEDD enhances cyclin D1 expression by interacting with heat shock 71 kDa protein 8 (HSC70). Concurrently, DEDD interacts with Rb family proteins and promotes their proteasome-mediated degradation. DEDD overexpression renders TNBCs vulnerable to cell cycle inhibition. Patients with TNBC have been excluded from CDK 4/6 inhibitor clinical trials due to the perceived high frequency of Rb-loss in TNBCs. Interestingly, our study demonstrated that, irrespective of Rb status, TNBCs with DEDD overexpression exhibit a DEDD-dependent vulnerability to combinatorial treatment with CDK4/6 inhibitor and EGFR inhibitor in vitro and in vivo. Thus, our study provided a rationale for the clinical application of CDK4/6 inhibitor combinatorial regimens for patients with TNBC.
Collapse
|
6
|
Epigenetic and non-epigenetic functions of the RYBP protein in development and disease. Mech Ageing Dev 2018; 174:111-120. [DOI: 10.1016/j.mad.2018.03.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 03/22/2018] [Accepted: 03/26/2018] [Indexed: 12/30/2022]
|
7
|
Zhan S, Wang T, Ge W, Li J. Multiple roles of Ring 1 and YY1 binding protein in physiology and disease. J Cell Mol Med 2018; 22:2046-2054. [PMID: 29383875 PMCID: PMC5867070 DOI: 10.1111/jcmm.13503] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Accepted: 11/16/2017] [Indexed: 12/17/2022] Open
Abstract
Ring 1 and YY1 binding protein (RYBP) was first identified in 1999, and its structure includes a conserved Npl4 Zinc finger motif at the N‐terminus, a central region that is characteristically enriched with arginine and lysine residues and a C‐terminal region enriched with serine and threonine amino acids. Over nearly 20 years, multiple studies have found that RYBP functions as an organ developmental adaptor. There is also evidence that RYBP regulates the expression of different genes involved in various aspects of biological processes, via a mechanism that is dependent on interactions with components of PcG complexes and/or through binding to different transcriptional factors. In addition, RYBP interacts directly or indirectly with apoptosis‐associated proteins to mediate anti‐apoptotic or pro‐apoptotic activity in both the cytoplasm and nucleus of various cell types. Furthermore, RYBP has also been shown to act as tumour suppressor gene in different solid tumours, but as an oncogene in lymphoma and melanoma. In this review, we summarize our current understanding of the functions of this multifaceted RYBP in physiological and pathological conditions, including embryonic development, apoptosis and cancer, as well as its role as a component of polycomb repressive complex 1.
Collapse
Affiliation(s)
- Shaohua Zhan
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology, Beijing, China.,National Key Laboratory of Medical Molecular Biology & Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Tianxiao Wang
- Key Laboratory of Carcinogenesis and Translational Research, Department of Head and Neck Surgery, Peking University Cancer Hospital & Institute, Beijing, China
| | - Wei Ge
- National Key Laboratory of Medical Molecular Biology & Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Jinming Li
- National Center for Clinical Laboratories, Beijing Hospital, National Center of Gerontology, Beijing, China
| |
Collapse
|
8
|
Golstein P. Conserved nucleolar stress at the onset of cell death. FEBS J 2017; 284:3791-3800. [DOI: 10.1111/febs.14095] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 03/31/2017] [Accepted: 04/26/2017] [Indexed: 01/19/2023]
Affiliation(s)
- Pierre Golstein
- Centre d'Immunologie de Marseille‐Luminy Aix Marseille Université Inserm, CNRS France
| |
Collapse
|
9
|
Zhao Q, Cai W, Zhang X, Tian S, Zhang J, Li H, Hou C, Ma X, Chen H, Huang B, Chen D. RYBP Expression Is Regulated by KLF4 and Sp1 and Is Related to Hepatocellular Carcinoma Prognosis. J Biol Chem 2016; 292:2143-2158. [PMID: 28028181 DOI: 10.1074/jbc.m116.770727] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Indexed: 01/01/2023] Open
Abstract
The expression of Ring1- and YY1-binding protein (RYBP) is reduced in several human cancers, but the molecular mechanism(s) have remained elusive. In this study, we used human hepatocellular carcinoma (HCC) cell lines and tissue specimens to study the mechanism and herein report several new findings. First, we cloned and characterized the basal promoter region of the human RYBP gene. We found that the decreased RYBP expression in HCC tissues was not due to promoter sequence variation/polymorphisms or CpG dinucleotide methylation. We identified two transcription factors, KLF4 and Sp1, which directly bind the promoter region of RYBP to induce and suppress RYBP transcription, respectively. We mapped the binding sites of KLF4 and Sp1 on the RYBP promoter. Studies in vitro showed that KLF4 suppresses whereas Sp1 promotes HCC cell growth through modulating RYBP expression. Deregulated KLF4 and Sp1 contributed to decreased expression of RYBP in HCC tumor tissues. Our studies of human HCC tissues indicated that a diminished RYBP level in the tumor (in association with altered KLF4 and Sp1 expression) was statistically associated with a larger tumor size, poorer differentiation, and an increased susceptibility to distant metastasis. These findings help to clarify why RYBP is decreased in HCC and indicate that deregulated KLF4, Sp1, and RYBP may lead to a poorer prognosis. Our findings support the idea that RYBP may represent a target for cancer therapy and suggest that it may be useful as a prognostic biomarker for HCC, either alone or in combination with KLF4 and Sp1.
Collapse
Affiliation(s)
- Qiaojiajie Zhao
- From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China
| | - Weihua Cai
- the Department of Hepatobiliary Surgery, Nantong Third Hospital, Nantong University, Nantong, Jiangsu 226006, China, and
| | - Xuan Zhang
- From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China
| | - Shuo Tian
- From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China
| | - Junwen Zhang
- From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China
| | - Haibo Li
- the Department of Clinical Laboratory Medicine, Nantong Maternal and Child Health Hospital, Nantong, Jiangsu 226018, China
| | - Congcong Hou
- From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China
| | - Xiaoli Ma
- From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China
| | - Hong Chen
- From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China
| | - Bingren Huang
- From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China,
| | - Deng Chen
- From the State Key Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and School of Basic Medicine, Peking Union Medical College, 5 Dong Dan San Tiao, Beijing 100005, China,
| |
Collapse
|
10
|
Chukkapalli S, Levi E, Rishi AK, Datta NS. PTHrP attenuates osteoblast cell death and apoptosis induced by a novel class of anti-cancer agents. Endocrine 2016; 51:534-44. [PMID: 26260694 DOI: 10.1007/s12020-015-0699-2] [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: 05/11/2015] [Accepted: 07/18/2015] [Indexed: 11/30/2022]
Abstract
The effectiveness of chemotherapeutic agents often limits their use due to their negative effects on normal cells. Apoptosis regulatory protein (CARP)-1 functional mimetics (CFMs) belong to a novel class of compounds that possess anti-cancer properties with potential utility in breast and other cancers. In this study, we investigated the growth inhibitory action of CFM-4 and -5 in bone-forming osteoblasts and role of a skeletal regulator, parathyroid hormone (PTH)-related peptide (PTHrP), which is frequently associated with oncologic pathologies. MC3T3E1-clone4 (MC-4) or primary osteoblasts were treated with CFMs. Western blots were performed to determine specific protein expressions. MTT, TUNEL assay, ethidium bromide/acridine orange staining, and ApoAlert caspase profiling were used to investigate cell viability and apoptosis of osteoblasts. Immunofluorescence staining was performed to observe intracellular localization of CARP-1. Our studies revealed that CFM-4 and -5 suppressed growths of mature differentiated, but not proliferating, MC-4 cells and PTHrP attenuated this effect. Mechanistically, induction of CARP-1 protein by CFM-4 and -5 was partially decreased by PTHrP. While CARP-1 increased by CFM-4 or -5 correlated with activated caspase-3, PTHrP remarkably blocked caspase-3 activation. PTHrP also influenced translocation of CFM-induced CARP-1 from the nucleus to the cytoplasm. Our data identify a new function of PTHrP in maintaining osteoblast homeostasis in chemotherapy and define a role of CARP-1 in this process. The crosstalk of PTHrP and CFM-4 and -5 signaling highlights the importance of CFMs as potential anti-cancer therapeutics in breast and other cancers which adversely affect bone.
Collapse
Affiliation(s)
- Sahiti Chukkapalli
- Division of Endocrinology, Department of Internal Medicine, Wayne State University School of Medicine, 1107 Elliman Clinical Research Building, 421 East Canfield Avenue, Detroit, MI, 48201, USA
| | - Edi Levi
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, 48201, USA
- VA Medical Center, Detroit, MI, 48201, USA
| | - Arun K Rishi
- Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI, 48201, USA
- VA Medical Center, Detroit, MI, 48201, USA
- Department of Oncology, Wayne State University School of Medicine, Detroit, MI, 48201, USA
| | - Nabanita S Datta
- Division of Endocrinology, Department of Internal Medicine, Wayne State University School of Medicine, 1107 Elliman Clinical Research Building, 421 East Canfield Avenue, Detroit, MI, 48201, USA.
- Barbara Ann Karmanos Cancer Institute, Wayne State University School of Medicine, Detroit, MI, 48201, USA.
- Cardiovascular Research Institute, Wayne State University School of Medicine, Detroit, MI, 48201, USA.
| |
Collapse
|
11
|
Lo YC, Lin SC, Yang CY, Tung JY. Tandem DEDs and CARDs suggest novel mechanisms of signaling complex assembly. Apoptosis 2014; 20:124-35. [DOI: 10.1007/s10495-014-1054-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
12
|
Aparicio R, Neyen C, Lemaitre B, Busturia A. dRYBP contributes to the negative regulation of the Drosophila Imd pathway. PLoS One 2013; 8:e62052. [PMID: 23596533 PMCID: PMC3626645 DOI: 10.1371/journal.pone.0062052] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2013] [Accepted: 03/17/2013] [Indexed: 12/22/2022] Open
Abstract
The Drosophila humoral innate immune response fights infection by producing antimicrobial peptides (AMPs) through the microbe-specific activation of the Toll or the Imd signaling pathway. Upon systemic infection, the production of AMPs is both positively and negatively regulated to reach a balanced immune response required for survival. Here, we report the function of the dRYBP (drosophila Ring and YY1 Binding Protein) protein, which contains a ubiquitin-binding domain, in the Imd pathway. We have found that dRYBP contributes to the negative regulation of AMP production: upon systemic infection with Gram-negative bacteria, Diptericin expression is up-regulated in the absence of dRYBP and down-regulated in the presence of high levels of dRYBP. Epistatic analyses using gain and loss of function alleles of imd, Relish, or skpA and dRYBP suggest that dRYBP functions upstream or together with SKPA, a member of the SCF-E3-ubiquitin ligase complex, to repress the Imd signaling cascade. We propose that the role of dRYBP in the regulation of the Imd signaling pathway is to function as a ubiquitin adaptor protein together with SKPA to promote SCF-dependent proteasomal degradation of Relish. Beyond the identification of dRYBP as a novel component of Imd pathway regulation, our results also suggest that the evolutionarily conserved RYBP protein may be involved in the human innate immune response.
Collapse
Affiliation(s)
- Ricardo Aparicio
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
| | - Claudine Neyen
- Global Health Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Bruno Lemaitre
- Global Health Institute, School of Life Sciences, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Ana Busturia
- Centro de Biología Molecular Severo Ochoa, Consejo Superior de Investigaciones Científicas and Universidad Autónoma de Madrid, Madrid, Spain
- * E-mail:
| |
Collapse
|
13
|
Cherezova L, Burnside KL, Rose TM. Conservation of complex nuclear localization signals utilizing classical and non-classical nuclear import pathways in LANA homologs of KSHV and RFHV. PLoS One 2011; 6:e18920. [PMID: 21559489 PMCID: PMC3084728 DOI: 10.1371/journal.pone.0018920] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2010] [Accepted: 03/23/2011] [Indexed: 11/18/2022] Open
Abstract
ORF73 latency-associated nuclear antigen (LANA) of the Kaposi's sarcoma-associated herpesvirus (KSHV) is targeted to the nucleus of infected cells where it binds to chromatin and mediates viral episome persistence, interacts with cellular proteins and plays a role in latency and tumorigenesis. A structurally related LANA homolog has been identified in the retroperitoneal fibromatosis herpesvirus (RFHV), the macaque homolog of KSHV. Here, we report the evolutionary and functional conservation of a novel bi-functional nuclear localization signal (NLS) in KSHV and RFHV LANA. N-terminal peptides from both proteins were fused to EGFP or double EGFP fusions to examine their ability to induce nuclear transport of a heterologous protein. In addition, GST-pull down experiments were used to analyze the ability of LANA peptides to interact with members of the karyopherin family of nuclear transport receptors. Our studies revealed that both LANA proteins contain an N-terminal arginine/glycine (RG)-rich domain spanning a conserved chromatin-binding motif, which binds directly to importin β1 in a RanGTP-sensitive manner and serves as an NLS in the importin β1-mediated non-classical nuclear import pathway. Embedded within this domain is a conserved lysine/arginine-(KR)-rich bipartite motif that binds directly to multiple members of the importin α family of nuclear import adaptors in a RanGTP-insensitive manner and serves as an NLS in the classical importin α/β-mediated nuclear import pathway. The positioning of a classical bipartite kr-NLS embedded within a non-classical rg-NLS is a unique arrangement in these viral proteins, whose nuclear localization is critical to their functionality and to the virus life cycle. The ability to interact with multiple import receptors provides alternate pathways for nuclear localization of LANA. Since different import receptors can import cargo to distinct subnuclear compartments, a multifunctional NLS may provide LANA with an increased ability to interact with different nuclear components in its multifunctional role to maintain viral latency.
Collapse
Affiliation(s)
- Lidia Cherezova
- Department of Global Health, University of Washington, Seattle, Washington, United States of America
- Center for Childhood Infections and Prematurity Research, Seattle Children's Research Institute, Seattle, Washington, United States of America
| | - Kellie L. Burnside
- Center for Childhood Infections and Prematurity Research, Seattle Children's Research Institute, Seattle, Washington, United States of America
- Department of Pediatrics, University of Washington, Seattle, Washington, United States of America
| | - Timothy M. Rose
- Center for Childhood Infections and Prematurity Research, Seattle Children's Research Institute, Seattle, Washington, United States of America
- Department of Pediatrics, University of Washington, Seattle, Washington, United States of America
- * E-mail:
| |
Collapse
|
14
|
Abstract
IMPORTANCE OF THE FIELD Cytokine-induced apoptosis inhibitor 1 (CIAPIN1) is a newly identified cytokine-induced apoptosis inhibitor, which has roles in cell division and angiogenesis. Owing to its prognostic value for human tumors and involvement in cancer progression and tumor cell resistance to anticancer agents, CIAPIN1 has been proposed as an attractive target for new anticancer interventions. AREAS COVERED IN THIS REVIEW We define CIAPIN1's potential function as a new therapeutic target for anticancer interventions and this review covers all related literature on CIAPIN1 in cancer from the past 5 years WHAT THE READER WILL GAIN Several preclinical studies have demonstrated that CIAPIN1 is associated with chemotherapy resistance, increased tumor recurrence and shorter patient survival in different human tumor models, making anti-CIAPIN1 therapy an attractive cancer treatment strategy. Recent studies also suggest that CIAPIN1 is expressed at low levels in some types of malignant tumors and that its overexpression may inhibit their proliferation or tumorigenesis. TAKE HOME MESSAGE Considering that the exact expression and function of CIAPIN1 are still not well characterized and understood, better knowledge of CIAPIN1 in normal versus tumor tissues will be instrumental for the design of optimal strategies to selectively disrupt CIAPIN1 in cancer.
Collapse
Affiliation(s)
- Xiaohua Li
- The Fourth Military Medical University, State Key Laboratory of Cancer Biology & Xijing Hospital of Digestive Diseases, 17 Changle Western Road, Xi'an, 710032, China
| | | | | |
Collapse
|
15
|
DEDD negatively regulates transforming growth factor-beta1 signaling by interacting with Smad3. FEBS Lett 2010; 584:3028-34. [PMID: 20553715 DOI: 10.1016/j.febslet.2010.05.043] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Revised: 05/18/2010] [Accepted: 05/19/2010] [Indexed: 01/17/2023]
Abstract
Transforming growth factor-beta1 (TGF-beta1) regulates a wide variety of cellular responses, such as proliferation, differentiation, migration and apoptosis. Here we report that death effector domain-containing DNA-binding protein (DEDD) physically interacts with Smad3. The inhibition of Smad3 by DEDD resulted in a reduction in TGF-beta1/Smad3-mediated transcription. DEDD inhibited the functions of Smad3 by preventing Smad3 phosphorylation, which led to the reduced expression of TGF-beta1/Smad3-targeted genes. TGF-beta1 inhibited DEDD expression, and DEDD inhibited TGF-beta1-mediated invasion. Therefore, our findings suggest that through its interaction with Smad3, DEDD is a novel negative regulator of the TGF-beta1 signaling pathway.
Collapse
|
16
|
Katayama R, Ishioka T, Takada S, Takada R, Fujita N, Tsuruo T, Naito M. Modulation of Wnt signaling by the nuclear localization of cellular FLIP-L. J Cell Sci 2010; 123:23-8. [PMID: 20016063 DOI: 10.1242/jcs.058602] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Cellular FLIP (cFLIP) inhibits the apoptosis signaling initiated by death receptor ligation. We previously reported that a long form of cFLIP (cFLIP-L) enhances Wnt signaling via inhibition of beta-catenin ubiquitylation. In this report, we present evidence that cFLIP-L translocates into the nucleus, which could have a role in modulation of Wnt signaling. cFLIP-L has a functional bipartite nuclear localization signal (NLS) at the C-terminus. Wild-type cFLIP-L (wt-FLIP-L) localizes in both the nucleus and cytoplasm, whereas NLS-mutated cFLIP-L localizes predominantly in the cytoplasm. cFLIP-L also has a nuclear export signal (NES) near the NLS, and leptomycin B, an inhibitor of CRM1-dependent nuclear export, increases the nuclear accumulation of cFLIP-L, suggesting that it shuttles between the nucleus and cytoplasm. Expression of mutant cFLIP-L proteins with a deletion or mutations in the NLS and NES confers resistance to Fas-mediated apoptosis, as does wt-FLIP-L, but they do not enhance Wnt signaling, which suggests an important role of the C-terminus of cFLIP-L in Wnt-signaling modulation. When wt-FLIP-L is expressed in the cytoplasm by conjugation with exogenous NES (NES-FLIP-L), Wnt signaling is not enhanced, whereas the NES-FLIP-L increases cytoplasmic beta-catenin as efficiently as wt-FLIP-L. cFLIP-L physically interacts with the reporter plasmid for Wnt signaling, but not with the control plasmid. These results suggest a role for nuclear cFLIP-L in the modulation of Wnt signaling.
Collapse
Affiliation(s)
- Ryohei Katayama
- Institute of Molecular and Cellular Biosciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan
| | | | | | | | | | | | | |
Collapse
|
17
|
Banerjee M, Datta M, Majumder P, Mukhopadhyay D, Bhattacharyya NP. Transcription regulation of caspase-1 by R393 of HIPPI and its molecular partner HIP-1. Nucleic Acids Res 2009; 38:878-92. [PMID: 19934260 PMCID: PMC2817453 DOI: 10.1093/nar/gkp1011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Earlier we have shown that exogenous expression of HIPPI, a molecular partner of Huntingtin interacting protein HIP-1, induces apoptosis and increases expression of caspases-1, -8 and -10 in HeLa and Neuro2A cells. The C-terminal pseudo death effector domain of HIPPI (pDED-HIPPI) specifically interacts with the putative promoter sequences of these genes. In the present manuscript, we predict from structural modeling of pDED-HIPPI that R393 of HIPPI is important for such interaction. R393E mutation in pDED-HIPPI decreases the interaction with the putative promoter of caspase-1 in cells. Expression of caspase-1 is decreased in cells expressing mutant pDED-HIPPI in comparison to that observed in cells expressing wild type pDED-HIPPI. Using HIP-1 knocked down cells as well as over expressing HIP-1 with mutation at its nuclear localization signal and other deletion mutations, we demonstrate that translocation of HIPPI to the nucleus is mediated by HIP-1 for the increased expression of caspase-1. HIPPI-HIP-1 heterodimer is detected in cytoplasm as well as in the nucleus and is associated with transcription complex in cells. Taking together, we are able to show the importance of R393 of HIPPI and the role of HIPPI-HIP-1 heterodimer in the transcription regulation of caspase-1.
Collapse
Affiliation(s)
- M Banerjee
- Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700 064, India
| | | | | | | | | |
Collapse
|
18
|
Gene network analysis of oxidative stress-mediated drug sensitivity in resistant ovarian carcinoma cells. THE PHARMACOGENOMICS JOURNAL 2009; 10:94-104. [PMID: 19918261 DOI: 10.1038/tpj.2009.49] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Drug resistance in cancer cells involves complex molecular mechanisms and ovarian carcinoma cells become resistant to chlorambucil (Cbl) after continuous treatment. This drug- and ionizing radiation-resistant cells have lower level of endogenous ROS (reactive oxygen species) compared with sensitive cells. Elevation of the cellular ROS level by exogenous ROS generation increases the sensitivity of Cbl to resistant cells. In contrast, antioxidants prevent the sensitization of resistant cells to Cbl by H(2)O(2), COS (chronic oxidative stress) or NOO(-). The molecular mechanism of drug sensitivity with COS has been investigated by microarray gene expressions followed by gene network analysis and it reveals that a cdc42/rac1 guanine exchange factor, ARHGEF6, with p53 and DNA-Pkc (PRKDC) is central to induce apoptosis in Cbl(cos) (Cbl with COS) cells. mRNA and protein levels of major gene network pathway differ significantly in Cbl(cos) cells than in Cbl-treated cells. Moreover, DNA-PKc physically interacts with ARHGEF6 and p53 mostly in the nucleus of Cbl-treated cells, whereas in Cbl(cos)-treated cells, its interactions are mostly in the cytoplasm. These results suggest that low doses of Cbl and very low doses of COS together kill Cbl-resistant ovarian carcinoma cells and ARHGEF6 signaling may have an instrumental role in induction of apoptosis in Cbl(cos) cells.
Collapse
|
19
|
Novak RL, Phillips AC. Adenoviral-mediated Rybp expression promotes tumor cell-specific apoptosis. Cancer Gene Ther 2008; 15:713-22. [PMID: 18551146 DOI: 10.1038/cgt.2008.25] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Previous work demonstrated that exogenous expression of Rybp (Ring 1 YY1-binding protein or DEDAF) kills tumor but not non-transformed cells. This tumor-preferential killing activity could be exploited in a gene therapy approach to treat cancer. To test the potential of viral-mediated delivery of Rybp as an anticancer treatment, we generated an adenovirus expressing Rybp (Ad-Rybp). Infection with Ad-Rybp inhibits the proliferation of a range of tumor cell lines, but has no effect on normal cell types. This inhibition of proliferation is the result of the induction of apoptosis, consistent with reports that Rybp regulates apoptosis. Combined Ad-Rybp infection and etoposide treatment resulted in an additive cytotoxic effect in the osteosarcoma cell line U20S. Furthermore, Ad-Rybp infection synergistically cooperates with the death receptor ligand, tumor necrosis factor-alpha, in the induction of apoptosis. These results suggest that Ad-Rybp may have clinical applicability, either alone or in combination with other agents for the treatment of cancer.
Collapse
Affiliation(s)
- R L Novak
- 1Medical College of Georgia, Institute of Molecular Medicine and Genetics, Department of Gene Regulation and Cancer Biology, Augusta, GA, USA
| | | |
Collapse
|
20
|
Abstract
Human herpesvirus 8 (HHV-8) is the etiological agent of Kaposi's sarcoma. We present a localization map of 85 HHV-8-encoded proteins in mammalian cells. Viral open reading frames were cloned with a Myc tag in expression plasmids, confirmed by full-length sequencing, and expressed in HeLa cells. Protein localizations were analyzed by immunofluorescence microscopy. Fifty-one percent of all proteins were localized in the cytoplasm, 22% were in the nucleus, and 27% were found in both compartments. Surprisingly, we detected viral FLIP (v-FLIP) in the nucleus and in the cytoplasm, whereas cellular FLIPs are generally localized exclusively in the cytoplasm. This suggested that v-FLIP may exert additional or alternative functions compared to cellular FLIPs. In addition, it has been shown recently that the K10 protein can bind to at least 15 different HHV-8 proteins. We noticed that K10 and only five of its 15 putative binding factors were localized in the nucleus when the proteins were expressed in HeLa cells individually. Interestingly, in coexpression experiments K10 colocalized with 87% (13 of 15) of its putative binding partners. Colocalization was induced by translocation of either K10 alone or both proteins. These results indicate active intracellular translocation processes in virus-infected cells. Specifically in this framework, the localization map may provide a useful reference to further elucidate the function of HHV-8-encoded genes in human diseases.
Collapse
|
21
|
Majumder P, Choudhury A, Banerjee M, Lahiri A, Bhattacharyya NP. Interactions of HIPPI, a molecular partner of Huntingtin interacting protein HIP1, with the specific motif present at the putative promoter sequence of the caspase-1, caspase-8 and caspase-10 genes. FEBS J 2007; 274:3886-99. [PMID: 17623017 DOI: 10.1111/j.1742-4658.2007.05922.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
To investigate the mechanism of increased expression of caspase-1 caused by exogenous Hippi, observed earlier in HeLa and Neuro2A cells, in this work we identified a specific motif AAAGACATG (- 101 to - 93) at the caspase-1 gene upstream sequence where HIPPI could bind. Various mutations in this specific sequence compromised the interaction, showing the specificity of the interactions. In the luciferase reporter assay, when the reporter gene was driven by caspase-1 gene upstream sequences (- 151 to - 92) with the mutation G to T at position - 98, luciferase activity was decreased significantly in green fluorescent protein-Hippi-expressing HeLa cells in comparison to that obtained with the wild-type caspase-1 gene 60 bp upstream sequence, indicating the biological significance of such binding. It was observed that the C-terminal 'pseudo' death effector domain of HIPPI interacted with the 60 bp (- 151 to - 92) upstream sequence of the caspase-1 gene containing the motif. We further observed that expression of caspase-8 and caspase-10 was increased in green fluorescent protein-Hippi-expressing HeLa cells. In addition, HIPPI interacted in vitro with putative promoter sequences of these genes, containing a similar motif. In summary, we identified a novel function of HIPPI; it binds to specific upstream sequences of the caspase-1, caspase-8 and caspase-10 genes and alters the expression of the genes. This result showed the motif-specific interaction of HIPPI with DNA, and indicates that it could act as transcription regulator.
Collapse
Affiliation(s)
- P Majumder
- Structural Genomics Section, Saha Institute of Nuclear Physics, Bidhan Nagar, Kolkata, India
| | | | | | | | | |
Collapse
|
22
|
Amato R, Menniti M, Agosti V, Boito R, Costa N, Bond HM, Barbieri V, Tagliaferri P, Venuta S, Perrotti N. IL-2 signals through Sgk1 and inhibits proliferation and apoptosis in kidney cancer cells. J Mol Med (Berl) 2007; 85:707-21. [PMID: 17571248 DOI: 10.1007/s00109-007-0205-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2007] [Revised: 03/14/2007] [Accepted: 04/16/2007] [Indexed: 10/23/2022]
Abstract
The interleukin-2 is a cytokine that is essential for lymphocytic survival and function. Ectopic expression of the IL-2 receptor in epithelial tissues has been reported previously, although the functional significance of this expression is still being investigated. We provided novel structural and functional information on the expression of the IL-2 receptor in kidney cancer cells and in other normal and neoplastic human epithelial tissues. In A-498 kidney cancer cells, we showed that IL-2 binding to its own receptor triggers a signal transduction pathway leading to the inhibition of proliferation and apoptosis. We found that the inhibition of proliferation is associated with Erk1/2 dephosphorylation, whereas the survival signals appear to be mediated by Sgk1 activation. This investigation focuses on the IL-2 induced regulation of Sgk1 and describes a role of the IL-2 receptor and Sgk1 in the regulation of epithelial tumor cell death and survival.
Collapse
Affiliation(s)
- Rosario Amato
- Department of Experimental and Clinical Medicine G. Salvatore, University Magna Graecia, Campus Biomedico, Località Germaneto, Viale Europa, Catanzaro, 88100, Italy
| | | | | | | | | | | | | | | | | | | |
Collapse
|
23
|
Vazquez-Ortiz G, García JA, Ciudad CJ, Noé V, Peñuelas S, López-Romero R, Mendoza-Lorenzo P, Piña-Sánchez P, Salcedo M. Differentially expressed genes between high-risk human papillomavirus types in human cervical cancer cells. Int J Gynecol Cancer 2007; 17:484-91. [PMID: 17309674 DOI: 10.1111/j.1525-1438.2007.00831.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Cervical carcinoma (CC) is one of the most common cancers among women worldwide and the first cause of death among the Mexican female population. Human papillomavirus (HPV) infection is the most important etiologic factor for CC. Of the oncogenic types, HPV16 and HPV18 are found in 60-70% of invasive CCs worldwide. HPV18 appears to be associated with a more aggressive form of cervical neoplasia than HPV16 infection. At present, there are no studies on differentially expressed cellular genes between transformed cells harboring HPV16 and HPV18 sequences. Based on previous complementary DNA microarray data from our group, 13 genes were found to be differentially overexpressed between HPV16- and HPV18-transformed cells. These genes were as follows: E6BP, UBE4A, C20orf14, ATF7, ABCC8, SLC6A12, WASF3, SUV39H1, SPAG8, CCNC, E2FFE, BIRC5, and DEDD. Differential expression of six selected genes was confirmed by real-time reverse transcription-polymerase chain reaction (RT-PCR). All real-time RT-PCRs confirmed differential expression between HPV18 and HPV(-) samples. The present work identifies genes from signaling pathways triggered by HPV transformation that could be differentially deregulated between HPV16(+) and HPV18(+) samples.
Collapse
Affiliation(s)
- G Vazquez-Ortiz
- Laboratory of Oncogenomics, Oncology Research Unit, Oncology Hospital, National Medical Center SXXI-IMSS, México, DF, Mexico
| | | | | | | | | | | | | | | | | |
Collapse
|
24
|
Yao Z, Duan S, Hou D, Heese K, Wu M. Death effector domain DEDa, a self-cleaved product of caspase-8/Mch5, translocates to the nucleus by binding to ERK1/2 and upregulates procaspase-8 expression via a p53-dependent mechanism. EMBO J 2007; 26:1068-80. [PMID: 17290218 PMCID: PMC1852837 DOI: 10.1038/sj.emboj.7601571] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Accepted: 01/02/2007] [Indexed: 02/08/2023] Open
Abstract
Activation of the apical caspase-8 is crucial to the extrinsic apoptotic pathway. Although the death effector domain (DED) of caspase-8 has been reported to be involved in death-inducing signaling complex formation, the detailed mechanism of how DED functions in regulating apoptosis remains largely unknown. Here, we demonstrate that the prodomain of the caspase-8/Mch5 can be further cleaved between two tandemly repeated DEDs (DEDa-DEDb) at the amino-acid residue Asp129 by caspase-8 itself. The DEDa fragment generated from the endogenous caspase-8 was detected in isolated nucleoli upon treatment with TRAIL (tumor necrosis factor-related apoptosis-inducing ligand). Cleaved DEDa appears to translocate into the nucleus by association with extracellular signal-regulated protein kinases-1/2 (ERK1/2). Elimination of ERK1/2 expression by RNA interference resulted in a significant attenuation of nuclear entry of DEDa and reduced caspase-8-dependent apoptosis. In the nucleus, DEDa interacts with TOPORS, a p53 and topoisomerase I binding protein, and possibly displaces p53 from TOPORS, allowing p53 to stimulate caspase-8 gene expression. In summary, we postulate a positive feedback loop involving DEDa, which enables the continual replenishment of procaspase-8 during apoptosis.
Collapse
Affiliation(s)
- Zhan Yao
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, People's Republic of China
| | - Shanshan Duan
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, People's Republic of China
| | - Dezhi Hou
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, People's Republic of China
| | - Klaus Heese
- Department of Molecular and Cell Biology, School of Biological Sciences, Nanyang Technological University, Singapore
| | - Mian Wu
- Hefei National Laboratory for Physical Sciences at Microscale and School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, People's Republic of China
- School of Life Sciences, University of Science and Technology of China, 443 Huang-Shan Road, Hefei, Anhui 230027, People's Republic of China. Tel.: +86 551 3607324; Fax: +86 551 3606264; E-mail:
| |
Collapse
|
25
|
Stegh AH, Kim H, Bachoo RM, Forloney KL, Zhang J, Schulze H, Park K, Hannon GJ, Yuan J, Louis DN, DePinho RA, Chin L. Bcl2L12 inhibits post-mitochondrial apoptosis signaling in glioblastoma. Genes Dev 2007; 21:98-111. [PMID: 17210792 PMCID: PMC1759904 DOI: 10.1101/gad.1480007] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Glioblastoma (GBM) is an astrocytic brain tumor characterized by an aggressive clinical course and intense resistance to all therapeutic modalities. Here, we report the identification and functional characterization of Bcl2L12 (Bcl2-like-12) that is robustly expressed in nearly all human primary GBMs examined. Enforced Bcl2L12 expression confers marked apoptosis resistance in primary cortical astrocytes, and, conversely, its RNA interference (RNAi)-mediated knockdown sensitizes human glioma cell lines toward apoptosis in vitro and impairs tumor growth with increased intratumoral apoptosis in vivo. Mechanistically, Bcl2L12 expression does not affect cytochrome c release or apoptosome-driven caspase-9 activation, but instead inhibits post-mitochondrial apoptosis signaling at the level of effector caspase activation. One of Bcl2L12's mechanisms of action stems from its ability to interact with and neutralize caspase-7. Notably, while enforced Bcl2L12 expression inhibits apoptosis, it also engenders a pronecrotic state, which mirrors the cellular phenotype elicited by genetic or pharmacologic inhibition of post-mitochondrial apoptosis molecules. Thus, Bcl2L12 contributes to the classical tumor biological features of GBM such as intense apoptosis resistance and florid necrosis, and may provide a target for enhanced therapeutic responsiveness of this lethal cancer.
Collapse
Affiliation(s)
- Alexander H. Stegh
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
| | - Hyunggee Kim
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
| | - Robert M. Bachoo
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
- Center for Neuro-Oncology and Department of Neurology, Brigham and Women’s Hospital, Boston, Massachusetts 02115, USA
| | - Kristin L. Forloney
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
| | - Jean Zhang
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
- Center for Applied Cancer Science and the Belfer Foundation Institute for Innovative Cancer Science, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
| | - Harald Schulze
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
| | - Kevin Park
- Department of Pathology, Cancer Center and Neurosurgical Service, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Gregory J. Hannon
- Watson School of Biological Sciences, Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724, USA
| | - Junying Yuan
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
| | - David N. Louis
- Department of Pathology, Cancer Center and Neurosurgical Service, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02115, USA
| | - Ronald A. DePinho
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
- Center for Applied Cancer Science and the Belfer Foundation Institute for Innovative Cancer Science, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
- Department of Medicine and Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA
- E-MAIL ; FAX (617) 632-6069
| | - Lynda Chin
- Department of Medical Oncology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
- Center for Applied Cancer Science and the Belfer Foundation Institute for Innovative Cancer Science, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA
- Department of Dermatology, Harvard Medical School, Boston, Massachusetts 02115, USA
- Corresponding authors.E-MAIL ; FAX (617) 582-8169
| |
Collapse
|
26
|
Kumari G, Singhal PK, Rao MRKS, Mahalingam S. Nuclear transport of Ras-associated tumor suppressor proteins: different transport receptor binding specificities for arginine-rich nuclear targeting signals. J Mol Biol 2007; 367:1294-311. [PMID: 17320110 DOI: 10.1016/j.jmb.2007.01.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2006] [Revised: 12/28/2006] [Accepted: 01/05/2007] [Indexed: 12/30/2022]
Abstract
Ras proteins regulate a wide range of biological processes by interacting with a variety of effector proteins. In addition to the known role in tumorigensis, the activated form of Ras exhibits growth-inhibitory effects by unknown mechanisms. Several Ras effector proteins identified as mediators of apoptosis and cell-cycle arrest also exhibit properties normally associated with tumor suppressor proteins. Here, we show that Ras effector RASSF5/NORE-1 binds strongly to K-Ras but weakly to both N-Ras and H-Ras. RASSF5 was found to localize both in the nucleus and the nucleolus in contrast to other Ras effector proteins, RASSF1C and RASSF2, which are localized in the nucleus and excluded from nucleolus. A 50 amino acid residue transferable arginine-rich nucleolar localization signal (NoLS) identified in RASSF5 is capable of interacting with importin-beta and transporting the cargo into the nucleolus. Surprisingly, similar arginine-rich signals identified in RASSF1C and RASSF2 interact with importin-alpha and transport the heterologous cytoplasmic proteins to the nucleus. Interestingly, mutation of arginine residues within these nuclear targeting signals prevented interaction of Ras effector proteins with respective transport receptors and abolished their nuclear translocation. These results provide evidence for the first time that arginine-rich signals are able to recognize different nuclear import receptors and transport the RASSF proteins into distinct sub-cellular compartments. In addition, our data suggest that the nuclear localization of RASSF5 is critical for its cell growth control activity. Together, these data suggest that the transport of Ras effector superfamily proteins into the nucleus/nucleolus may play a vital role in modulating Ras-mediated cell proliferation during tumorigenesis.
Collapse
Affiliation(s)
- Gita Kumari
- Laboratory of Molecular Virology, Centre for DNA Fingerprinting and Diagnostics, Hyderabad 500076, India
| | | | | | | |
Collapse
|
27
|
Schutte B, Henfling M, Ramaekers FCS. DEDD association with cytokeratin filaments correlates with sensitivity to apoptosis. Apoptosis 2006; 11:1561-72. [PMID: 16820959 DOI: 10.1007/s10495-006-9113-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The cytokeratin 8/18 (CK8/18) cytoskeleton network is an early target for caspase cleavage during apoptosis. Recent reports suggest that the highly conserved and ubiquitous death effector domain containing DNA binding protein (DEDD) plays a role in the recruitment of procaspase-9 and -3 at this CK8/18 scaffold. DEDD interacts with both the CK8/18 intermediate filament network and procaspase-3 and -9. It is suggested that the CK8/18 fibrils may provide a scaffold for the proximity-induced autocleavage and activation of procaspase-9 in close association with caspase-3.We addressed this issue by investigating DEDD staining patterns in various cell lines and by correlating these expression patterns with the sensitivity of these cell lines for roscovitine-induced apoptosis. We showed that in some cell lines DEDD revealed a bright filamentous staining pattern in others DEDD staining was weak and diffusely distributed in the cytoplasm of the cells. The difference in staining patterns was irrespective of the phosphorylation status of the cytokeratin filaments. In cells showing a filamentous staining pattern, DEDD was strongly associated with the CK8/18 cytokeratin filaments as evidenced by double immunofluorescence and its resistance to extraction with Triton X-100. Subcellular fractionation indicates that DEDD co-purifies with CK18, which corroborates a strong association of DEDD and the cytokeratin network. DEDD was either mono- or diubiquinated. Cells showing a filamentous DEDD distribution are more apoptosis-prone as evidenced by the rapid appearance of M30 CytoDeath-positive cells after induction of apoptosis. The sensitivity towards apoptosis is irrespective of the procaspase-3 content of the cells. Our data support the notion that DEDD-mediated accumulation of procaspases at the cytokeratin scaffold leads to an increase in the local concentration, which renders cells more apoptosis-prone.
Collapse
Affiliation(s)
- Bert Schutte
- Department of Molecular Cell Biology, Research Institute Growth & Development, GROW, University of Maastricht, P.O. Box 616, 6200, MD, Maastricht, The Netherlands.
| | | | | |
Collapse
|
28
|
Banerjee M, Majumder P, Bhattacharyya NP, Dattagupta JK, Sen U. Cloning, expression, purification, crystallization and preliminary crystallographic analysis of pseudo death-effector domain of HIPPI, a molecular partner of Huntingtin-interacting protein HIP-1. Acta Crystallogr Sect F Struct Biol Cryst Commun 2006; 62:1247-50. [PMID: 17142908 PMCID: PMC2225382 DOI: 10.1107/s1744309106046628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2006] [Accepted: 11/06/2006] [Indexed: 02/08/2023]
Abstract
The formation of a heterodimer between Huntingtin-interacting protein-1 (HIP-1) and its novel partner HIPPI (HIP-1 protein interactor) through their pseudo death-effector domains (pDEDs) is a key step that recruits caspase-8 and initiates apoptosis. This could be one of the pathways by which apoptosis is increased in Huntington's disease (HD). A construct consisting of the pDED of HIPPI has been cloned and overexpressed as 6NH-tagged protein and purified by Ni-NTA affinity chromatography. Crystals of the pDED of HIPPI were grown in space group P4(1), with unit-cell parameters a = b = 77.42, c = 33.31 A and a calculated Matthews coefficient of 1.88 A3 Da(-1) (33% solvent content) with two molecules per asymmetric unit.
Collapse
Affiliation(s)
- Manisha Banerjee
- Structural Genomics Section, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700064, India
| | - Pritha Majumder
- Structural Genomics Section, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700064, India
| | - Nitai P. Bhattacharyya
- Structural Genomics Section, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700064, India
| | - Jiban K. Dattagupta
- Structural Genomics Section, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700064, India
| | - Udayaditya Sen
- Structural Genomics Section, Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata 700064, India
- Correspondence e-mail:
| |
Collapse
|
29
|
Abstract
The nuclear pore complex (NPC) is the sole gateway between the nucleus and the cytoplasm of interphase eukaryotic cells, and it mediates all trafficking between these 2 cellular compartments. As such, the NPC and nuclear transport play central roles in translocating death signals from the cell membrane to the nucleus where they initiate biochemical and morphological changes occurring during apoptosis. Recent findings suggest that the correlation between the NPC, nuclear transport, and apoptosis goes beyond the simple fact that NPCs mediate nuclear transport of key players involved in the cell death program. In this context, the accessibility of key regulators of apoptosis appears to be highly modulated by nuclear transport (e.g., impaired nuclear import might be an apoptotic trigger). In this review, recent findings concerning the unexpected tight link between NPCs, nuclear transport, and apoptosis will be presented and critically discussed.
Collapse
Affiliation(s)
- Birthe Fahrenkrog
- ME Müller Institute for Structural Biology, Biozentrum, University of Basel, Switzerland.
| |
Collapse
|
30
|
Ménard I, Gervais FG, Nicholson DW, Roy S. Caspase-3 cleaves the formin-homology-domain-containing protein FHOD1 during apoptosis to generate a C-terminal fragment that is targeted to the nucleolus. Apoptosis 2006; 11:1863-76. [PMID: 17013756 DOI: 10.1007/s10495-006-0087-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
The formin homology (FH) proteins play a crucial role in cytoskeleton remodelling during many essential processes. In this study, we demonstrate for the first time that the formin-homology-domain-containing protein FHOD1 is cleaved by caspase-3 at the SVPD(616) site during apoptosis. Using confocal microscopy, we further demonstrate that while full length FHOD1 is mostly cytoplasmic, the FHOD1 N-terminal cleavage product is diffusely localized throughout the cytoplasm and the nucleoplasm, whereas the C-terminal cleavage product is almost exclusively nuclear with some nucleolar localization. Finally, using a run-on transcription assay we show that the C-terminal FHOD1 cleavage product has the ability to inhibit RNA polymerase I transcription when overexpressed in HeLa cells as shown by blockage of BrUTP incorporation.
Collapse
Affiliation(s)
- Isabelle Ménard
- Department of Biochemistry, McGill University, 3655 Promenade Sir William Osler, Montreal, Quebec, Canada, H3G 1Y6
| | | | | | | |
Collapse
|
31
|
Abstract
Cytokine-induced apoptosis inhibitor 1 (CIAPIN1) is a newly identified anti-apoptotic molecule. Our previous studies have demonstrated that CIAPIN1 is ubiquitously expressed in normal fetal and adult human tissues and confers multidrug resistance in gastric cancer cells, possibly by upregulating the expression of multidrug resistance gene 1 and multidrug resistance-related protein 1. However, fundamental biological functions of CIAPIN1 have not been elucidated. In this study, we first predicted the subcellular localization of CIAPIN1 with bioinformatic approaches and then characterized the intracellular localization of CIAPIN1 in both human and mouse cells by a combination of techniques including (a)immunohistochemistry and immunofluorescence, (b) His-tagged CIAPIN1 expression, and (c)subcellular fractionation and analysis of CIAPIN1 in the fractions by Western blotting. All methods produced consistent results; CIAPIN1 was localized in both the cytoplasm and the nucleus and was accumulated in the nucleolus. Bioinformatic prediction disclosed a putative nuclear localization signal and a putative nuclear export signal within both human and mouse CIAPIN1. These findings suggest that CIAPIN1 may undergo a cytoplasm-nucleus-nucleolus translocation.
Collapse
Affiliation(s)
- Zhiming Hao
- State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Xiaohua Li
- State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Taidong Qiao
- State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Rui Du
- State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Guoyun Zhang
- State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi Province, China
| | - Daiming Fan
- State Key Laboratory of Cancer Biology, Institute of Digestive Diseases, Xijing Hospital, The Fourth Military Medical University, Xi'an, Shaanxi Province, China
| |
Collapse
|
32
|
Abstract
Exposure of cells to phorbol ester activates protein kinase C (PKC) to induce apoptosis or differentiation, depending on the cellular context. In erythroblastic cell lines, TF-1 and D2, upregulation of the RhoA signaling promotes phorbol ester-induced apoptosis through activating Rho-associated kinase (ROCK)/phosphorylation of myosin light chain (MLC), thus generating membrane contraction force. As a result, cell adhesion is inhibited and death receptor-mediated death pathway is activated in these cells with a concurrent changes in nucleocytoplasmic signaling for protein trafficking. A microtubule-regulated GEF-H1, which is a specific RhoA activator, was identified to contribute to RhoA activation in these cells. Thus, a cytoskeleton-regulated RhoA signaling cooperates with PKC activation constitutes a cellular context to determine the cell fate in response to phorbol ester stimulation.
Collapse
Affiliation(s)
- Zee-Fen Chang
- Institute of Biochemistry and Molecular Biology, College of Medicine, National Taiwan University, No. 1, Section 1, Jen-Ai Road, Taipei, Taiwan, ROC.
| | | |
Collapse
|
33
|
Shiio Y, Suh KS, Lee H, Yuspa SH, Eisenman RN, Aebersold R. Quantitative Proteomic Analysis of Myc-induced Apoptosis. J Biol Chem 2006; 281:2750-6. [PMID: 16316993 DOI: 10.1074/jbc.m509349200] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Myc is a key regulatory protein in higher eukaryotes controlling important cellular functions such as proliferation, differentiation, and apoptosis. Myc is profoundly involved in the genesis of many human and animal cancers, and the abrogation of Myc-induced apoptosis is a critical event in cancer progression. Because the mechanisms that mediate Myc-induced apoptosis are largely unknown, we analyzed protein expression during Myc-induced apoptosis using an isotope-coded affinity tag quantitative proteomics approach and identified that a proapoptotic mitochondrial chloride ion channel, mtCLIC/CLIC4, is induced by Myc. Myc binds to the mtCLIC gene promoter and activates its transcription. Suppression of mtCLIC expression by RNA interference inhibited Myc-induced apoptosis in response to different stress conditions and abolished the cooperative induction of apoptosis by Myc and Bax. We also found that Myc reduces the expression of Bcl-2 and Bcl-xL and that the apoptosis-inducing stimuli up-regulate Bax expression. These results suggest that up-regulation of mtCLIC, together with a reduction in Bcl-2 and Bcl-xL, sensitizes Myc-expressing cells to the proapoptotic action of Bax.
Collapse
Affiliation(s)
- Yuzuru Shiio
- Institute for Systems Biology, Seattle, Washington 98103-8904, USA.
| | | | | | | | | | | |
Collapse
|
34
|
Huang X, Zhang M, Tang H, Ruo C, Cao X. Identification and characterization of DEDDL, a human-specific isoform of DEDD. Gene Expr 2006; 13:141-53. [PMID: 17193921 PMCID: PMC6032443 DOI: 10.3727/000000006783991836] [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] [Indexed: 11/24/2022]
Abstract
Death effector domain (DED) containing molecules are usually involved in the intracellular apoptosis cascade as executioners or regulators. One of these molecules, DEDD, was identified as a final target of the CD95 signaling pathway by which it would be transferred into the nucleolus to inhibit RNA polymerase I-dependent transcription. Here we describe a longer isoform of DEDD, DEDDL, produced by alternatively splicing, as an immune cell-specific DED-containing molecule. It is only expressed in human T lymphocytes and dendritic cells (DCs), and the mRNA expression in DCs was elevated upon inductive maturation. In cell lines MCF-7 and Jurkat, the overexpression of DEDDL could induce apoptosis more potently than that of DEDD. That DEDDL could bind FADD and cFLIP more potently than DEDD in vivo was revealed by cotransfection and immunoprecipitation. This may explain why DEDDL is a more potent apoptosis inducer, because DED-containing proteins usually induce apoptosis through DED binding. Finally, why DEDD and DEDDL are unstable in the overexpression and other studies may be explained by the finding that they are potential substrates of active caspases.
Collapse
Affiliation(s)
- Xin Huang
- Institute of Immunology, Second Military Medical University, Shanghai, 200433, PR China.
| | | | | | | | | |
Collapse
|
35
|
Lee JC, Wang GX, Schickling O, Peter ME. Fusing DEDD with ubiquitin changes its intracellular localization and apoptotic potential. Apoptosis 2005; 10:1483-95. [PMID: 16235027 DOI: 10.1007/s10495-005-1833-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
DEDD, a highly conserved and ubiquitous death effector domain containing protein, exists in non, mono, and diubiquitinated forms. We previously reported that endogenous unmodified DEDD is only found in nucleoli and that mono- and diubiquitinated DEDD associate with caspase-3 in the cytosol suggesting that ubiquitination may be important to the apoptosis regulating functions of DEDD in the cytosol. We now demonstrate that many of its 16 lysine residues can serve as alternative acceptors for ubiquitination to maintain the monoubiquitination status of DEDD. A central region in DEDD (amino acids 109-305) outside the death effector domain was found to be essential for ubiquitination and/or the docking of the ubiquitination machinery. Fusion of ubiquitin to the C-terminus of DEDD to mimic monoubiquitinated DEDD relocated DEDD from nucleoli to the cytosol. This fusion protein also demonstrated a greater apoptosis potential than unmodified DEDD. Finally, we show that both mono- and polyubiquitination of DEDD can be achieved by the cellular inhibitor of apoptosis proteins 1 and 2 (cIAP-1/2). In addition, the cotransfection of DEDD with cIAP-1 or cIAP-2 results in the relocalization of the IAPs to the nucleoli. Our data suggest that monoubiquitination of DEDD regulates both its cytoplasmic localization and its proapoptotic potential and that IAP proteins can regulate DEDD's ubiquitination status.
Collapse
Affiliation(s)
- J C Lee
- The Ben May Institute for Cancer Research, University of Chicago, 924 E. 57th Street, Chicago, IL 60637, USA
| | | | | | | |
Collapse
|
36
|
Hui H, Dotta F, Di Mario U, Perfetti R. Role of caspases in the regulation of apoptotic pancreatic islet beta-cells death. J Cell Physiol 2004; 200:177-200. [PMID: 15174089 DOI: 10.1002/jcp.20021] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The homeostatic control of beta-cell mass in normal and pathological conditions is based on the balance of proliferation, differentiation, and death of the insulin-secreting cells. A considerable body of evidence, accumulated during the last decade, has emphasized the significance of the disregulation of the mechanisms regulating the apoptosis of beta-cells in the sequence of events that lead to the development of diabetes. The identification of agents capable of interfering with this process needs to be based on a better understanding of the beta-cell specific pathways that are activated during apoptosis. The aim of this article is fivefold: (1) a review of the evidence for beta-cell apoptosis in Type I diabetes, Type II diabetes, and islet transplantation, (2) to review the common stimuli and their mechanisms in pancreatic beta-cell apoptosis, (3) to review the role of caspases and their activation pathway in beta-cell apoptosis, (4) to review the caspase cascade and morphological cellular changes in apoptotic beta-cells, and (5) to highlight the putative strategies for preventing pancreatic beta-cells from apoptosis.
Collapse
Affiliation(s)
- Hongxiang Hui
- Division of Diabetes, Endocrinology and Metabolism, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA
| | | | | | | |
Collapse
|
37
|
Py B, Slomianny C, Auberger P, Petit PX, Benichou S. Siva-1 and an alternative splice form lacking the death domain, Siva-2, similarly induce apoptosis in T lymphocytes via a caspase-dependent mitochondrial pathway. THE JOURNAL OF IMMUNOLOGY 2004; 172:4008-17. [PMID: 15034012 DOI: 10.4049/jimmunol.172.7.4008] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Siva-1 is a death domain-containing proapoptotic protein identified as an intracellular ligand of CD27 and of the glucocorticoid-induced TNFR family-related gene, which are two members of the TNFR family expressed on lymphoid cells. Although Siva-1 expression is up-regulated in multiple pathological processes, little is known about the signaling pathway underlying the Siva-induced apoptosis. In this study, we investigated the mechanism of the proapoptotic activity of Siva-1 and an alternative splice form lacking the death domain of Siva-1, Siva-2, in T lymphocytes in which Siva proteins, CD27, and glucocorticoid-induced TNFR family-related gene are primarily expressed. Overexpression of Siva proteins triggers a typical apoptotic process manifested by cell shrinkage and surface exposure of phosphatidylserine, and confirmed by ultrastructural features. Siva-induced apoptosis is related to the CD27-mediated apoptotic pathway and results in activation of both initiator and effector caspases. This pathway involves a mitochondrial step evidenced by activation of Bid and cytochrome c release, and is modulated by overexpression of Bcl-2 or Bcl-x(L). The determinants for Siva-induced apoptosis are not contained within the death domain found in the central part of Siva-1, but rather in both the N-terminal and C-terminal regions shared by both Siva proteins. The N-terminal region also participates in the translocation of both Siva proteins into the nuclear compartment. These results indicate that Siva-1 and Siva-2 mediate apoptosis in T lymphocytes via a caspase-dependent mitochondrial pathway that likely involves both cytoplasmic and nuclear events.
Collapse
Affiliation(s)
- Bénédicte Py
- Département de Maladies Infectieuses, Institut Cochin, Institut National de la Santé et de la Recherche Médicale U567, Centre National de la Recherche Scientifique UMR8104, Université Paris 5, Paris, France
| | | | | | | | | |
Collapse
|
38
|
Dinsdale D, Lee JC, Dewson G, Cohen GM, Peter ME. Intermediate filaments control the intracellular distribution of caspases during apoptosis. THE AMERICAN JOURNAL OF PATHOLOGY 2004; 164:395-407. [PMID: 14742246 PMCID: PMC1602261 DOI: 10.1016/s0002-9440(10)63130-6] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Caspases are responsible for a cascade of events controlling the disassembly of apoptotic cells. We now demonstrate that caspase-9 is activated at an early stage of apoptosis in epithelial cells and all its detectable, catalytically active large subunits (both the p35 and p37) are concentrated on cytokeratin fibrils. Immunolabeling of distinctive neoepitopes, exposed by cleavage of procaspase-9 at either Asp315 or Asp330, was co-localized on these fibrils with active caspase-3, caspase-cleaved cytokeratin-18, death-effector-domain containing DNA-binding protein and ubiquitin. Cytokeratin filaments may thus provide a scaffold whereby active subunits of caspase-9 can activate caspase-3 which, in turn, can activate more caspase-9 so forming an amplification loop to facilitate cleavage of cytokeratin-18, disruption of the cytoskeleton and the ensuing formation of cytoplasmic inclusions. These inclusions, formed from the collapse of fibrils, together with their associated components, also contain ubiquitinated proteins, vimentin, heat-shock protein 72, and tumor necrosis factor receptor type-1-associated death domain protein. Many of their constituents, including active caspases, remain sequestered within these inclusions, even after detergent treatment and isolation. Thus, such inclusions do not merely accumulate disrupted cytokeratins but also sequestrate potentially noxious proteins that could injure healthy neighboring cells.
Collapse
Affiliation(s)
- David Dinsdale
- Medical Research Council Toxicology Unit, Leicester, United Kingdom.
| | | | | | | | | |
Collapse
|
39
|
Abstract
Apoptosis signaling is regulated and executed by specialized proteins that often carry protein/protein interaction domains. One of these domains is the death effector domain (DED) that is predominantly found in components of the death-inducing signaling complex, which forms at the members of the death receptor family following their ligation. Both proapoptotic- and antiapoptotic-DED-containing proteins have been identified, which makes these proteins exquisitely suited to the regulation of apoptosis. Aside from their pivotal role in the control of the apoptotic program, DED-containing proteins have recently been demonstrated to exert their influence on other cellular processes as well, including cell proliferation. These data highlight the multiple roles for the members of this family, suggesting that they are suited to control both life and death decisions of cells. Additionally, because they can act proapoptotically, antiapoptotically, or in the regulation of the cell cycle, this family of proteins may be excellent candidates for cancer therapy targets. Oncogene (2003) 22, 8634-8644. doi:10.1038/sj.onc.1207103
Collapse
Affiliation(s)
- Bryan C Barnhart
- The Ben May Institute for Cancer Research, University of Chicago, 924 E 57th Street, Chicago, IL 60637, USA
| | | | | | | |
Collapse
|
40
|
Leliveld SR, Dame RT, Mommaas MA, Koerten HK, Wyman C, Danen-van Oorschot AAAM, Rohn JL, Noteborn MHM, Abrahams JP. Apoptin protein multimers form distinct higher-order nucleoprotein complexes with DNA. Nucleic Acids Res 2003; 31:4805-13. [PMID: 12907722 PMCID: PMC169900 DOI: 10.1093/nar/gkg661] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The chicken anaemia virus-derived protein apoptin is a tumour-specific cell-killing agent. It is biologically active as a highly stable, multimeric complex, consisting of 30-40 monomers. In tumour cells, but negligibly in normal cells, apoptin is imported into the nucleus prior to the induction of apoptosis. Immunoelectron microscopic data we report here indicate that apoptin predominantly co-localises with heterochromatin and nucleoli within tumour cells. Apoptin's preference for these DNA-dense nuclear bodies may be explained by our finding that apoptin cooperatively forms distinct superstructures with DNA in vitro. These superstructures do not grow beyond a diameter of approximately 200 nm, containing up to 20 multimeric apoptin complexes and approximately 3 kb of DNA. Furthermore, we show a single apoptin multimer to have eight independent, non-specific DNA-binding sites which preferentially bind strand ends, but which can also collaborate to bind longer stretches of DNA. Apoptin's high affinity for naked, undecorated double- and single-stranded DNA and for DNA fibre ends suggests that it may also capture such DNA in superstructures in vivo. Since these forms of DNA are predominantly found in transcriptionally active, replicating and damaged DNA, apoptin could be triggering apoptosis by interfering with DNA transcription and synthesis.
Collapse
|
41
|
Abstract
Cell elimination through apoptosis, or programmed cell death, is an evolutionarily conserved central tenet of biology from embryological development to immune homeostasis. While many of the apoptotic signaling pathways have been elucidated, the relationship between ubiquitin and apoptosis is only beginning to be defined. In the past decade, many reports of polyubiquitin conjugation of key pro- and anti-apoptotic molecules have characterized ubiquitin as an essential regulatory modification targeting proteins for proteasomal degradation. However, recent work relating monoubiquitination and nonclassical polyubiquitin conjugation to apoptotic molecules has added an additional level of diversity to the role of ubiquitin in apoptotic regulation beyond degradation. This review focuses on the direct effects of ubiquitination on apoptosis-signaling molecules.
Collapse
Affiliation(s)
- Justine C Lee
- The Ben May Institute for Cancer Research, University of Chicago, Chicago, IL 60637, USA
| | | |
Collapse
|
42
|
Tibbetts MD, Zheng L, Lenardo MJ. The death effector domain protein family: regulators of cellular homeostasis. Nat Immunol 2003; 4:404-9. [PMID: 12719729 DOI: 10.1038/ni0503-404] [Citation(s) in RCA: 157] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The death effector domain (DED) occurs in proteins that regulate programmed cell death. Both pro- and anti-apoptotic proteins containing DEDs have been identified. For Fas and possibly other death receptors, homotypic DED interactions connect the Fas-associated death domain (FADD) protein to caspase-8 and caspase-10 to mediate formation of the death-inducing signal complex. This complex can be inhibited by other DED-containing proteins. Accumulating evidence now suggests that DED-containing proteins have additional roles in controlling pathways of cellular activation and proliferation. Thus, the DED defines a family of proteins that may be pivotal to cellular homeostasis by establishing a 'cell renewal set point' that coregulates proliferation and apoptosis in parallel.
Collapse
Affiliation(s)
- Michael D Tibbetts
- Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
| | | | | |
Collapse
|
43
|
Screaton RA, Kiessling S, Sansom OJ, Millar CB, Maddison K, Bird A, Clarke AR, Frisch SM. Fas-associated death domain protein interacts with methyl-CpG binding domain protein 4: a potential link between genome surveillance and apoptosis. Proc Natl Acad Sci U S A 2003; 100:5211-6. [PMID: 12702765 PMCID: PMC154324 DOI: 10.1073/pnas.0431215100] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Fas-associated death domain protein (FADD) is an adaptor protein bridging death receptors with initiator caspases. Thus, its function and localization are assumed to be cytoplasmic, although the localization of endogenous FADD has not been reported. Surprisingly, the data presented here demonstrate that FADD is mainly nuclear in several adherent cell lines. Its accumulation in the nucleus and export to the cytoplasm required the phosphorylation site Ser-194, which was also required for its interaction with the nucleocytoplasmic shuttling protein exportin-5. Within the nucleus, FADD interacted with the methyl-CpG binding domain protein 4 (MBD4), which excises thymine from GT mismatches in methylated regions of chromatin. The MBD4-interacting mismatch repair factor MLH1 was also found in a complex with FADD. The FADD-MBD4 interaction involved the death effector domain of FADD and a region of MBD4 adjacent to the glycosylase domain. The FADD-binding region of MBD4 was downstream of a frameshift mutation that occurs in a significant fraction of human colorectal carcinomas. Consistent with the idea that MBD4 can signal to an apoptotic effector, MBD4 regulated DNA damage-, Fas ligand-, and cell detachment-induced apoptosis. The nuclear localization of FADD and its interaction with a genome surveillance/DNA repair protein that can regulate apoptosis suggests a novel function of FADD distinct from direct participation in death receptor signaling complexes.
Collapse
Affiliation(s)
- Robert A Screaton
- The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA
| | | | | | | | | | | | | | | |
Collapse
|
44
|
Abstract
An apoptotic signal triggered by cell surface death receptors is disseminated to intracellular compartments through protein-protein interactions mediated by conserved domains such as the death effector domain (DED). A unique family of single DED-containing proteins, including DEDD and DEDD2, is targeted to the nucleolus. However, the role of DEDD/DEDD2 in apoptosis remains less understood. Here we show that DEDD and DEDD2 are highly conserved in diverse species, and that they are potent inducers of apoptosis in various cell types. Deletion analysis indicates that both the N-terminal DED domain and the C-terminal region of DEDD2 can induce apoptosis. The cell death activity of this family appears to be related to their nuclear localization. DEDD and DEDD2 bind to two tandem DED-containing caspases, caspase -8 and -10, that are engaged by death receptors. Consistent with the nuclear localization of this family, caspase-8 translocates to the nucleus during CD95-induced apoptosis. DEDD and DEDD2 also readily associate with themselves and with each other. These results suggest that DEDD and DEDD2 may be important mediators for death receptors and that they may target caspases to the nucleus.
Collapse
Affiliation(s)
- Allison Alcivar
- Abramson Family Cancer Research Institute, University of Pennsylvania School of Medicine, Philadelphia 19104, USA
| | | | | | | |
Collapse
|
45
|
Lee JC, Schickling O, Stegh AH, Oshima RG, Dinsdale D, Cohen GM, Peter ME. DEDD regulates degradation of intermediate filaments during apoptosis. J Cell Biol 2002; 158:1051-66. [PMID: 12235123 PMCID: PMC2173221 DOI: 10.1083/jcb.200112124] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Apoptosis depends critically on regulated cytoskeletal reorganization events in a cell. We demonstrate that death effector domain containing DNA binding protein (DEDD), a highly conserved and ubiquitous death effector domain containing protein, exists predominantly as mono- or diubiquitinated, and that diubiquitinated DEDD interacts with both the K8/18 intermediate filament network and pro-caspase-3. Early in apoptosis, both cytosolic DEDD and its close homologue DEDD2 formed filaments that colocalized with and depended on K8/18 and active caspase-3. Subsequently, these filamentous structures collapsed into intracellular inclusions that migrated into cytoplasmic blebs and contained DEDD, DEDD2, active caspase-3, and caspase-3-cleaved K18 late in apoptosis. Biochemical studies further confirmed that DEDD coimmunoprecipitated with both K18 and pro-caspase-3, and kinetic analyses placed apoptotic DEDD staining prior to caspase-3 activation and K18 cleavage. In addition, both caspase-3 activation and K18 cleavage was inhibited by expression of DEDDDeltaNLS1-3, a cytosolic form of DEDD that cannot be ubiquitinated. Finally, siRNA mediated DEDD knockdown cells exhibited inhibition of staurosporine-induced DNA degradation. Our data suggest that DEDD represents a novel scaffold protein that directs the effector caspase-3 to certain substrates facilitating their ordered degradation during apoptosis.
Collapse
Affiliation(s)
- Justine C Lee
- The Ben May Institute for Cancer Research, University of Chicago, 924 E 57th Street, Chicago, IL 60637, USA
| | | | | | | | | | | | | |
Collapse
|
46
|
Couzinet A, Hérincs Z, Hueber AO. Régulation de la mort cellulaire programmée : vers une conception plus dynamique. Med Sci (Paris) 2002. [DOI: 10.1051/medsci/20021889841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
|
47
|
Zhan Y, Hegde R, Srinivasula SM, Fernandes-Alnemri T, Alnemri ES. Death effector domain-containing proteins DEDD and FLAME-3 form nuclear complexes with the TFIIIC102 subunit of human transcription factor IIIC. Cell Death Differ 2002; 9:439-47. [PMID: 11965497 DOI: 10.1038/sj.cdd.4401038] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2002] [Accepted: 02/08/2002] [Indexed: 01/08/2023] Open
Abstract
Death effector domain-containing proteins are involved in important cellular processes such as death-receptor induced apoptosis, NF-kappaB activation and ERK activation. Here we report the identification of a novel nuclear DED-containing protein, FLAME-3. FLAME-3 shares significant sequence (46.6% identical) and structural homology to another DED-containing protein, DEDD. FLAME-3 interacts with DEDD and c-FLIP (FLAME-1) but not with the other DED-containing proteins FADD, caspase-8 or caspase-10. FLAME-3 translocates to, and sequesters c-FLIP in the nucleus upon overexpression in human cell lines. Using the yeast two-hybrid system to identify DEDD-interacting proteins, the TFIIIC102 subunit of human transcription factor TFIIIC was identified as a DEDD- and FLAME-3-specific interacting protein. Co-expression of either DEDD or FLAME-3 with hTFIIIC102 in MCF-7 cells induces the translocation from the cytoplasm and sequestration of hTFIIIC102 in the nucleus, indicating that DEDD and FLAME-3 form strong heterocomplexes with hTFIIIC102 and might be important regulators of the activity of the hTFIIIC transcriptional complex. Consistent with this, overexpression of DEDD or FLAME-3 in 293 cells inhibited the expression of a luciferase-reporter gene under the control of the NF-kappaB promoter. Our data provide the first direct evidence for the involvement of DED-containing proteins in the regulation of components of the general transcription machinery in the nucleus.
Collapse
Affiliation(s)
- Y Zhan
- Center for Apoptosis Research, Kimmel Cancer Institute, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | | | | | | | | |
Collapse
|