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Ma Z, Guo D, Wang Q, Liu P, Xiao Y, Wu P, Wang Y, Chen B, Liu Z, Liu Q. Lgr5-mediated p53 Repression through PDCD5 leads to doxorubicin resistance in Hepatocellular Carcinoma. Am J Cancer Res 2019; 9:2967-2983. [PMID: 31244936 PMCID: PMC6568175 DOI: 10.7150/thno.30562] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Accepted: 04/24/2019] [Indexed: 01/11/2023] Open
Abstract
The devastating prognosis of hepatocellular carcinoma (HCC) is partially attributed to chemotherapy resistance. Accumulating evidence suggests that the epithelial-mesenchymal transition (EMT) is a key driving force of carcinoma metastasis and chemoresistance in solid tumors. Leucine-rich repeat-containing G protein-coupled receptor 5 (Lgr5), as an EMT inducer, is involved in the potentiation of Wnt signaling in HCC. This study proposes uncovering the roles of Lgr5 in Doxorubicin (Dox) resistance of HCC to improve treatment efficacy for HCC. Methods: We investigated the expression and significance of Lgr5 in HCC tissue and different cell lines. The effect of Lgr5 in EMT and Dox resistance was analyzed in HCC cells and implanted HCC tumor models. A two-hybrid analysis, using the Lgr5 gene as the bait and a HCC cDNA library, was used to screen targeted proteins that interact with Lgr5. The positive clones were identified by coimmunoprecipitation (Co-IP) and Glutathione-S-transferase (GST) pull-down. The impact of the interaction on Dox resistance was investigated by a series of assays in vitro and in vivo . Result: We found that Lgr5 was upregulated and positively correlated with poor prognosis in HCC. Additionally, it functioned as a tumor promoter to increase cell migration and induce EMT in HCC cells and increase the resistance to Dox. We identified programmed cell death protein 5 (PDCD5) as a target gene of Lgr5 and we found that PDCD5 was responsible for Lgr5-mediated Dox resistance. Further analysis with Co-IP and GST pull-down assays showed that the N-terminal extracellular domain of Lgr5 could directly bind to PDCD5. Lgr5 induced p53 degradation by blocking the nuclear translocation of PDCD5 and leading to the loss of p53 stabilization. Lgr5 showed a protection against the inhibition of Dox on the growth of tumor subcutaneously injected. Moreover, Lgr5 suppressed Dox-induced apoptosis via the p53 pathway and attenuated the cytotoxicity of Dox to HCC. Conclusion: Lgr5 induces the EMT and inhibits apoptosis, thus promoting chemoresistance by regulating the PDCD5/p53 signaling axis. Furthermore, Lgr5 may be a potential target gene for overcoming Dox resistance.
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Liu X, Yang X, Li Y, Zhao S, Li C, Ma P, Mao B. Trip12 is an E3 ubiquitin ligase for USP7/HAUSP involved in the DNA damage response. FEBS Lett 2016; 590:4213-4222. [DOI: 10.1002/1873-3468.12471] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 10/12/2016] [Accepted: 10/17/2016] [Indexed: 01/07/2023]
Affiliation(s)
- Xiaoliang Liu
- State Key Laboratory of Genetic Resources and Evolution; Kunming Institute of Zoology; Chinese Academy of Sciences; China
- Kunming College of Life Science; University of Chinese Academy of Sciences; China
| | - Xiangcai Yang
- State Key Laboratory of Genetic Resources and Evolution; Kunming Institute of Zoology; Chinese Academy of Sciences; China
- Kunming College of Life Science; University of Chinese Academy of Sciences; China
| | - Yongxin Li
- State Key Laboratory of Genetic Resources and Evolution; Kunming Institute of Zoology; Chinese Academy of Sciences; China
- Kunming College of Life Science; University of Chinese Academy of Sciences; China
| | - Shuhua Zhao
- Yunnan Population and Family Planning Research Institute; Kunming China
| | - Chaocui Li
- State Key Laboratory of Genetic Resources and Evolution; Kunming Institute of Zoology; Chinese Academy of Sciences; China
| | - Pengcheng Ma
- State Key Laboratory of Genetic Resources and Evolution; Kunming Institute of Zoology; Chinese Academy of Sciences; China
| | - Bingyu Mao
- State Key Laboratory of Genetic Resources and Evolution; Kunming Institute of Zoology; Chinese Academy of Sciences; China
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Burroughs AM, Aravind L. RNA damage in biological conflicts and the diversity of responding RNA repair systems. Nucleic Acids Res 2016; 44:8525-8555. [PMID: 27536007 PMCID: PMC5062991 DOI: 10.1093/nar/gkw722] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 08/08/2016] [Indexed: 12/16/2022] Open
Abstract
RNA is targeted in biological conflicts by enzymatic toxins or effectors. A vast diversity of systems which repair or ‘heal’ this damage has only recently become apparent. Here, we summarize the known effectors, their modes of action, and RNA targets before surveying the diverse systems which counter this damage from a comparative genomics viewpoint. RNA-repair systems show a modular organization with extensive shuffling and displacement of the constituent domains; however, a general ‘syntax’ is strongly maintained whereby systems typically contain: a RNA ligase (either ATP-grasp or RtcB superfamilies), nucleotidyltransferases, enzymes modifying RNA-termini for ligation (phosphatases and kinases) or protection (methylases), and scaffold or cofactor proteins. We highlight poorly-understood or previously-uncharacterized repair systems and components, e.g. potential scaffolding cofactors (Rot/TROVE and SPFH/Band-7 modules) with their respective cognate non-coding RNAs (YRNAs and a novel tRNA-like molecule) and a novel nucleotidyltransferase associating with diverse ligases. These systems have been extensively disseminated by lateral transfer between distant prokaryotic and microbial eukaryotic lineages consistent with intense inter-organismal conflict. Components have also often been ‘institutionalized’ for non-conflict roles, e.g. in RNA-splicing and in RNAi systems (e.g. in kinetoplastids) which combine a distinct family of RNA-acting prim-pol domains with DICER-like proteins.
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Affiliation(s)
- A Maxwell Burroughs
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA
| | - L Aravind
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, MD 20894, USA
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Falcone Ferreyra ML, Casadevall R, D'Andrea L, AbdElgawad H, Beemster GTS, Casati P. AtPDCD5 Plays a Role in Programmed Cell Death after UV-B Exposure in Arabidopsis. PLANT PHYSIOLOGY 2016; 170:2444-60. [PMID: 26884483 PMCID: PMC4825121 DOI: 10.1104/pp.16.00033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Accepted: 02/14/2016] [Indexed: 05/07/2023]
Abstract
DNA damage responses have evolved to sense and react to DNA damage; the induction of DNA repair mechanisms can lead to genomic restoration or, if the damaged DNA cannot be adequately repaired, to the execution of a cell death program. In this work, we investigated the role of an Arabidopsis (Arabidopsis thaliana) protein, AtPDCD5, which is highly similar to the human PDCD5 protein; it is induced by ultraviolet (UV)-B radiation and participates in programmed cell death in the UV-B DNA damage response. Transgenic plants expressing AtPDCD5 fused to GREEN FLUORESCENT PROTEIN indicate that AtPDCD5 is localized both in the nucleus and the cytosol. By use of pdcd5 mutants, we here demonstrate that these plants have an altered antioxidant metabolism and accumulate higher levels of DNA damage after UV-B exposure, similar to levels in ham1ham2 RNA interference transgenic lines with decreased expression of acetyltransferases from the MYST family. By coimmunoprecipitation and pull-down assays, we provide evidence that AtPDCD5 interacts with HAM proteins, suggesting that both proteins participate in the same pathway of DNA damage responses. Plants overexpressing AtPDCD5 show less DNA damage but more cell death in root tips upon UV-B exposure. Finally, we here show that AtPDCD5 also participates in age-induced programmed cell death. Together, the data presented here demonstrate that AtPDCD5 plays an important role during DNA damage responses induced by UV-B radiation in Arabidopsis and also participates in programmed cell death programs.
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Affiliation(s)
- María Lorena Falcone Ferreyra
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, Rosario S2002LRK, Argentina (M.L.F.F., R.C., L.D., P.C.);Department of Biology, University of Antwerp, Antwerp, 2000 Belgium (H.A., G.T.S.B.); andDepartment of Botany, Faculty of Science, University of Beni-Suef, Beni-Suef, 62511 Egypt (H.A.)
| | - Romina Casadevall
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, Rosario S2002LRK, Argentina (M.L.F.F., R.C., L.D., P.C.);Department of Biology, University of Antwerp, Antwerp, 2000 Belgium (H.A., G.T.S.B.); andDepartment of Botany, Faculty of Science, University of Beni-Suef, Beni-Suef, 62511 Egypt (H.A.)
| | - Lucio D'Andrea
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, Rosario S2002LRK, Argentina (M.L.F.F., R.C., L.D., P.C.);Department of Biology, University of Antwerp, Antwerp, 2000 Belgium (H.A., G.T.S.B.); andDepartment of Botany, Faculty of Science, University of Beni-Suef, Beni-Suef, 62511 Egypt (H.A.)
| | - Hamada AbdElgawad
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, Rosario S2002LRK, Argentina (M.L.F.F., R.C., L.D., P.C.);Department of Biology, University of Antwerp, Antwerp, 2000 Belgium (H.A., G.T.S.B.); andDepartment of Botany, Faculty of Science, University of Beni-Suef, Beni-Suef, 62511 Egypt (H.A.)
| | - Gerrit T S Beemster
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, Rosario S2002LRK, Argentina (M.L.F.F., R.C., L.D., P.C.);Department of Biology, University of Antwerp, Antwerp, 2000 Belgium (H.A., G.T.S.B.); andDepartment of Botany, Faculty of Science, University of Beni-Suef, Beni-Suef, 62511 Egypt (H.A.)
| | - Paula Casati
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario, Rosario S2002LRK, Argentina (M.L.F.F., R.C., L.D., P.C.);Department of Biology, University of Antwerp, Antwerp, 2000 Belgium (H.A., G.T.S.B.); andDepartment of Botany, Faculty of Science, University of Beni-Suef, Beni-Suef, 62511 Egypt (H.A.)
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Li G, Ma D, Chen Y. Cellular functions of programmed cell death 5. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1863:572-80. [PMID: 26775586 DOI: 10.1016/j.bbamcr.2015.12.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Revised: 12/24/2015] [Accepted: 12/29/2015] [Indexed: 01/01/2023]
Abstract
Programmed cell death 5 (PDCD5) was originally identified as an apoptosis-accelerating protein that is widely expressed and has been well conserved during the process of evolution. PDCD5 has complex biological functions, including programmed cell death and immune regulation. It can accelerate apoptosis in different type of cells in response to different stimuli. During this process, PDCD5 rapidly translocates from the cytoplasm to the nucleus. PDCD5 regulates the activities of TIP60, HDAC3, MDM2 and TP53 transcription factors. These proteins form part of a signaling network that is disrupted in most, if not all, cancer cells. Recent evidence suggests that PDCD5 participates in immune regulation by promoting regulatory T cell function via the PDCD5-TIP60-FOXP3 pathway. The stability and expression of PDCD5 are finely regulated by other molecules, such as NF-κB p65, OTUD5, YAF2 and DNAJB1. PDCD5 is phosphorylated by CK2 at Ser119, which is required for nuclear translocation in response to genotoxic stress. In this review, we describe what is known about PDCD5 and its cellular functions.
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Affiliation(s)
- Ge Li
- Department of Immunology, Peking University School of Basic Medical Sciences, 38 Xueyuan Road, Beijing 100191, China; Center for Human Disease Genomics, Peking University, 38 Xueyuan Road, Beijing 100191, China
| | - Dalong Ma
- Department of Immunology, Peking University School of Basic Medical Sciences, 38 Xueyuan Road, Beijing 100191, China; Center for Human Disease Genomics, Peking University, 38 Xueyuan Road, Beijing 100191, China
| | - Yingyu Chen
- Department of Immunology, Peking University School of Basic Medical Sciences, 38 Xueyuan Road, Beijing 100191, China; Center for Human Disease Genomics, Peking University, 38 Xueyuan Road, Beijing 100191, China.
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