1
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Collins J, Piscopio RA, Reyland ME, Johansen CG, Benninger RKP, Farnsworth NL. Cleavage of protein kinase c δ by caspase-3 mediates pro-inflammatory cytokine-induced apoptosis in pancreatic islets. J Biol Chem 2024:107611. [PMID: 39074637 DOI: 10.1016/j.jbc.2024.107611] [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: 01/14/2024] [Revised: 07/04/2024] [Accepted: 07/17/2024] [Indexed: 07/31/2024] Open
Abstract
In type 1 diabetes (T1D), autoreactive immune cells infiltrate the pancreas and secrete pro-inflammatory cytokines that initiate cell death in insulin producing islet β-cells. Protein kinase C δ (PKCδ) plays a role in mediating cytokine-induced β-cell death; however, the exact mechanisms are not well understood. To address this, we utilized an inducible β-cell specific PKCδ KO mouse as well as a small peptide inhibitor of PKCδ. We identified a role for PKCδ in mediating cytokine-induced β-cell death and have shown that inhibiting PKCδ protects pancreatic β-cells from cytokine-induced apoptosis in both mouse and human islets. We determined that cytokines induced nuclear translocation and activity of PKCδ and that caspase-3 cleavage of PKCδ may be required for cytokine-mediated islet apoptosis. Further, cytokine activated PKCδ increases activity both of pro-apoptotic Bax with acute treatment and JNK with prolonged treatment. Overall, our results suggest that PKCδ mediates cytokine-induced apoptosis via nuclear translocation, cleavage by caspase-3, and upregulation of pro-apoptotic signaling in pancreatic β-cells. Combined with the protective effects of PKCδ inhibition with δV1-1, the results of this study will aid in the development of novel therapies to prevent or delay β-cell death and preserve β-cell function in T1D.
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Affiliation(s)
- Jillian Collins
- Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado
| | - Robert A Piscopio
- Barbara Davis Center for Childhood Diabetes, University of Colorado Anschutz Medical Campus, Aurora, Colorado; Department of Bioengineering, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Mary E Reyland
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO
| | - Chelsea G Johansen
- Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado
| | - Richard K P Benninger
- Barbara Davis Center for Childhood Diabetes, University of Colorado Anschutz Medical Campus, Aurora, Colorado; Department of Bioengineering, University of Colorado Anschutz Medical Campus, Aurora, Colorado.
| | - Nikki L Farnsworth
- Department of Chemical and Biological Engineering, Colorado School of Mines, Golden, Colorado; Barbara Davis Center for Childhood Diabetes, University of Colorado Anschutz Medical Campus, Aurora, Colorado.
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2
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Affandi T, Haas A, Ohm AM, Wright GM, Black JC, Reyland ME. PKCδ Regulates Chromatin Remodeling and DNA Repair through SIRT6. Mol Cancer Res 2024; 22:181-196. [PMID: 37889141 PMCID: PMC10872792 DOI: 10.1158/1541-7786.mcr-23-0493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 09/07/2023] [Accepted: 10/25/2023] [Indexed: 10/28/2023]
Abstract
Irradiation (IR) is a highly effective cancer therapy; however, IR damage to tumor-adjacent healthy tissues can result in significant comorbidities and potentially limit the course of therapy. We have previously shown that protein kinase C delta (PKCδ) is required for IR-induced apoptosis and that inhibition of PKCδ activity provides radioprotection in vivo. Here we show that PKCδ regulates histone modification, chromatin accessibility, and double-stranded break (DSB) repair through a mechanism that requires Sirtuin 6 (SIRT6). Overexpression of PKCδ promotes genomic instability and increases DNA damage and apoptosis. Conversely, depletion of PKCδ increases DNA repair via nonhomologous end joining (NHEJ) and homologous recombination (HR) as evidenced by increased formation of DNA damage foci, increased expression of DNA repair proteins, and increased repair of NHEJ and HR fluorescent reporter constructs. Nuclease sensitivity indicates that PKCδ depletion is associated with more open chromatin, while overexpression of PKCδ reduces chromatin accessibility. Epiproteome analysis reveals increased chromatin associated H3K36me2 in PKCδ-depleted cells which is accompanied by chromatin disassociation of KDM2A. We identify SIRT6 as a downstream mediator of PKCδ. PKCδ-depleted cells have increased SIRT6 expression, and depletion of SIRT6 reverses changes in chromatin accessibility, histone modification and DSB repair in PKCδ-depleted cells. Furthermore, depletion of SIRT6 reverses radioprotection in PKCδ-depleted cells. Our studies describe a novel pathway whereby PKCδ orchestrates SIRT6-dependent changes in chromatin accessibility to regulate DNA repair, and define a mechanism for regulation of radiation-induced apoptosis by PKCδ. IMPLICATIONS PKCδ controls sensitivity to irradiation by regulating DNA repair.
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Affiliation(s)
- Trisiani Affandi
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Ami Haas
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Angela M. Ohm
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Gregory M. Wright
- Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Joshua C. Black
- Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Mary E. Reyland
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
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3
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Meng F, Chen S, Liu C, Khan MS, Yan Y, Wan J, Xia Y, Sun C, Yang M, Hu R, Dai K. The role of PKC in X-ray-induced megakaryocyte apoptosis and thrombocytopenia. Blood Cells Mol Dis 2024; 104:102798. [PMID: 37813040 DOI: 10.1016/j.bcmd.2023.102798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 10/01/2023] [Accepted: 10/02/2023] [Indexed: 10/11/2023]
Abstract
Thrombocytopenia is a critical complication after radiation therapy and exposure. Dysfunction of megakaryocyte development and platelet production are key pathophysiological stages in ionizing radiation (IR)-induced thrombocytopenia. Protein kinase C (PKC) plays an important role in regulating megakaryocyte development and platelet production. However, it remains unclear how PKC regulates IR-induced megakaryocyte apoptosis. In this study, we found that pretreatment of PKC pan-inhibitor Go6983 delayed IR-induced megakaryocyte apoptosis, and inhibited IR-induced mitochondrial membrane potential and ROS production in CMK cells. Moreover, suppressing PKC activation inhibited cleaved caspase3 expression and reduced p38 phosphorylation levels, and IR-induced PKC activation might be regulated by p53. In vivo experiments confirmed that Go6983 promoted platelet count recovery after 21 days of 3 Gy total body irradiation. Furthermore, Go6983 reduced megakaryocyte apoptosis, increased the number of megakaryocyte and polyploid formation in bone marrow, and improved the survival rate of 6 Gy total body irradiation. In conclusion, our results provided a potential therapeutic target for IR-induced thrombocytopenia.
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Affiliation(s)
- Fanbi Meng
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Shuang Chen
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Chunliang Liu
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Muhammad Shoaib Khan
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Yan Yan
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Jun Wan
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Yue Xia
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Chenglin Sun
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Mengnan Yang
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Renping Hu
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China
| | - Kesheng Dai
- State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Cyrus Tang Medical Institute, Soochow University, Jiangsu Institute of Hematology, The First Affiliated Hospital of Soochow University, Key Laboratory of Thrombosis and Hemostasis, Suzhou 215000, China.
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4
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Nalli M, Di Magno L, Wen Y, Liu X, D’Ambrosio M, Puxeddu M, Parisi A, Sebastiani J, Sorato A, Coluccia A, Ripa S, Di Pastena F, Capelli D, Montanari R, Masci D, Urbani A, Naro C, Sette C, Orlando V, D’Angelo S, Biagioni S, Bigogno C, Dondio G, Pastore A, Stornaiuolo M, Canettieri G, Liu T, Silvestri R, La Regina G. Novel N-(Heterocyclylphenyl)benzensulfonamide Sharing an Unreported Binding Site with T-Cell Factor 4 at the β-Catenin Armadillo Repeats Domain as an Anticancer Agent. ACS Pharmacol Transl Sci 2023; 6:1087-1103. [PMID: 37470018 PMCID: PMC10353061 DOI: 10.1021/acsptsci.3c00092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Indexed: 07/21/2023]
Abstract
Despite intensive efforts, no inhibitors of the Wnt/β-catenin signaling pathway have been approved so far for the clinical treatment of cancer. We synthesized novel N-(heterocyclylphenyl)benzenesulfonamides as β-catenin inhibitors. Compounds 5-10 showed strong inhibition of the luciferase activity. Compounds 5 and 6 inhibited the MDA-MB-231, HCC1806, and HCC1937 TNBC cells. Compound 9 induced in vitro cell death in SW480 and HCT116 cells and in vivo tumorigenicity of a human colorectal cancer line HCT116. In a co-immunoprecipitation study in HCT116 cells transfected with Myc-tagged T-cell factor 4 (Tcf-4), compound 9 abrogated the association between β-catenin and Tcf-4. The crystallographic analysis of the β-catenin Armadillo repeats domain revealed that compound 9 and Tcf-4 share a common binding site within the hotspot binding region close to Lys508. To our knowledge, compound 9 is the first small molecule ligand of this region to be reported. These results highlight the potential of this novel class of β-catenin inhibitors as anticancer agents.
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Affiliation(s)
- Marianna Nalli
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy
| | - Laura Di Magno
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Molecular Medicine Sapienza, University of Rome, Viale Regina Elena 291, I-00161 Rome, Italy
| | - Yichao Wen
- Shanghai
Geriatric Institute of Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 365 South Xiangyang Road, 200031 Shanghai, China
| | - Xin Liu
- Department
of Dermatology, Yueyang Hospital of Integrated Traditional Chinese
and Western Medicine, Shanghai University
of Traditional Chinese Medicine, 200437 Shanghai, China
| | - Michele D’Ambrosio
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy
| | - Michela Puxeddu
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy
| | - Anastasia Parisi
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy
| | - Jessica Sebastiani
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy
| | - Andrea Sorato
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy
| | - Antonio Coluccia
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy
| | - Silvia Ripa
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Molecular Medicine Sapienza, University of Rome, Viale Regina Elena 291, I-00161 Rome, Italy
| | - Fiorella Di Pastena
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Molecular Medicine Sapienza, University of Rome, Viale Regina Elena 291, I-00161 Rome, Italy
| | - Davide Capelli
- CNR—Institute
of Crystallography, Via
Salaria—km 29.300, Monterotondo, 00015 Rome, Italy
| | - Roberta Montanari
- CNR—Institute
of Crystallography, Via
Salaria—km 29.300, Monterotondo, 00015 Rome, Italy
| | - Domiziana Masci
- Department
of Basic Biotechnological Sciences, Intensivological and Perioperative
Clinics, Catholic University of the Sacred
Heart, Largo Francesco
Vito 1, 00168 Rome, Italy
| | - Andrea Urbani
- Department
of Basic Biotechnological Sciences, Intensivological and Perioperative
Clinics, Catholic University of the Sacred
Heart, Largo Francesco
Vito 1, 00168 Rome, Italy
| | - Chiara Naro
- Department
of Basic Biotechnological Sciences, Intensivological and Perioperative
Clinics, Catholic University of the Sacred
Heart, Largo Francesco
Vito 1, 00168 Rome, Italy
- GSTeP-Organoids
Research Core Facility, Fondazione Policlinico
Universitario A. Gemelli, IRCCS, 00168 Rome, Italy
| | - Claudio Sette
- Department
of Basic Biotechnological Sciences, Intensivological and Perioperative
Clinics, Catholic University of the Sacred
Heart, Largo Francesco
Vito 1, 00168 Rome, Italy
- GSTeP-Organoids
Research Core Facility, Fondazione Policlinico
Universitario A. Gemelli, IRCCS, 00168 Rome, Italy
| | - Viviana Orlando
- Department
of Biology and Biotechnologies “Charles Darwin”, Piazzale Aldo Moro 5, I-00185 Roma, Italy
| | - Sara D’Angelo
- Department
of Biology and Biotechnologies “Charles Darwin”, Piazzale Aldo Moro 5, I-00185 Roma, Italy
| | - Stefano Biagioni
- Department
of Biology and Biotechnologies “Charles Darwin”, Piazzale Aldo Moro 5, I-00185 Roma, Italy
| | - Chiara Bigogno
- Aphad
SrL, Via della Resistenza
65, 20090 Buccinasco, Italy
| | - Giulio Dondio
- Aphad
SrL, Via della Resistenza
65, 20090 Buccinasco, Italy
| | - Arianna Pastore
- Department
of Pharmacy, University of Naples “Federico
II”, Via Domenico
Montesano, 49, 80131 Naples, Italy
| | - Mariano Stornaiuolo
- Department
of Pharmacy, University of Naples “Federico
II”, Via Domenico
Montesano, 49, 80131 Naples, Italy
| | - Gianluca Canettieri
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Molecular Medicine Sapienza, University of Rome, Viale Regina Elena 291, I-00161 Rome, Italy
| | - Te Liu
- Shanghai
Geriatric Institute of Chinese Medicine, Shanghai University of Traditional Chinese Medicine, 365 South Xiangyang Road, 200031 Shanghai, China
| | - Romano Silvestri
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy
| | - Giuseppe La Regina
- Laboratory
affiliated to Istituto Pasteur Italia—Fondazione Cenci Bolognetti,
Department of Drug Chemistry and Technologies, Sapienza University of Rome, Piazzale Aldo Moro 5, I-00185 Rome, Italy
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5
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Affandi T, Haas A, Ohm AM, Wright GM, Black JC, Reyland ME. PKCδ regulates chromatin remodeling and DNA repair through SIRT6. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.24.541991. [PMID: 37292592 PMCID: PMC10245827 DOI: 10.1101/2023.05.24.541991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Protein kinase C delta (PKCδ) is a ubiquitous kinase whose function is defined in part by localization to specific cellular compartments. Nuclear PKCδ is both necessary and sufficient for IR-induced apoptosis, while inhibition of PKCδ activity provides radioprotection in vivo. How nuclear PKCδ regulates DNA-damage induced cell death is poorly understood. Here we show that PKCδ regulates histone modification, chromatin accessibility, and double stranded break (DSB) repair through a mechanism that requires SIRT6. Overexpression of PKCδ promotes genomic instability and increases DNA damage and apoptosis. Conversely, depletion of PKCδ increases DNA repair via non-homologous end joining (NHEJ) and homologous recombination (HR) as evidenced by more rapid formation of NHEJ (DNA-PK) and HR (Rad51) DNA damage foci, increased expression of repair proteins, and increased repair of NHEJ and HR fluorescent reporter constructs. Nuclease sensitivity indicates that PKCδ depletion is associated with more open chromatin, while overexpression of PKCδ reduces chromatin accessibility. Epiproteome analysis revealed that PKCδ depletion increases chromatin associated H3K36me2, and reduces ribosylation of KDM2A and chromatin bound KDM2A. We identify SIRT6 as a downstream mediator of PKCδ. PKCδ-depleted cells have increased expression of SIRT6, and depletion of SIRT6 reverses the changes in chromatin accessibility, histone modification and NHEJ and HR DNA repair seen with PKCδ-depletion. Furthermore, depletion of SIRT6 reverses radioprotection in PKCδ-depleted cells. Our studies describe a novel pathway whereby PKCδ orchestrates SIRT6-dependent changes in chromatin accessibility to increase DNA repair, and define a mechanism for regulation of radiation-induced apoptosis by PKCδ.
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Affiliation(s)
- Trisiani Affandi
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Ami Haas
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Angela M. Ohm
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Gregory M. Wright
- Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Joshua C. Black
- Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
| | - Mary E. Reyland
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
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6
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Black JD, Affandi T, Black AR, Reyland ME. PKCα and PKCδ: Friends and Rivals. J Biol Chem 2022; 298:102194. [PMID: 35760100 PMCID: PMC9352922 DOI: 10.1016/j.jbc.2022.102194] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 06/13/2022] [Accepted: 06/21/2022] [Indexed: 01/06/2023] Open
Abstract
PKC comprises a large family of serine/threonine kinases that share a requirement for allosteric activation by lipids. While PKC isoforms have significant homology, functional divergence is evident among subfamilies and between individual PKC isoforms within a subfamily. Here, we highlight these differences by comparing the regulation and function of representative PKC isoforms from the conventional (PKCα) and novel (PKCδ) subfamilies. We discuss how unique structural features of PKCα and PKCδ underlie differences in activation and highlight the similar, divergent, and even opposing biological functions of these kinases. We also consider how PKCα and PKCδ can contribute to pathophysiological conditions and discuss challenges to targeting these kinases therapeutically.
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Affiliation(s)
- Jennifer D Black
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE.
| | - Trisiani Affandi
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus
| | - Adrian R Black
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE
| | - Mary E Reyland
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus.
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7
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Sun L, Wen S, Li Q, Lai X, Chen R, Zhang Z, Cao J, Sun S. Theaflavin-3,3'-di-gallate represses prostate cancer by activating the PKCδ/aSMase signaling pathway through a 67 kDa laminin receptor. Food Funct 2022; 13:4421-4431. [PMID: 35302141 DOI: 10.1039/d1fo04198c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Prostate cancer is a major cause of morbidity and mortality in men. Theaflavin-3,3'-digallate (TF-3) is an important functional ingredient of black tea. We aimed to evaluate the cytotoxic effects of TF-3 on prostate cancer and to identify the underlying molecular mechanism. In this study, we explored the effects of TF-3 on prostate cancer in PC-3 cells and in NOD/SCID mice with prostate cancer. The results demonstrated that TF-3 inhibited prostate cancer cell proliferation by regulating the PKCδ/aSMase signaling pathway. The anti-prostate cancer effect of TF-3 was attributed to the expression of the 67 kDa laminin receptor (67LR), which is overexpressed in various cancers, playing a vital role in the growth and metastasis of tumor cells. Stable knockdown of 67LR could efficiently inhibit TF-3 induced apoptosis and cell cycle arrest in PC-3 cells, through interacting with the PKCδ/aSMase signaling pathway. In vivo studies also confirmed the above findings that TF-3 effectively inhibited tumor growth in terms of tumor volume. TF-3 treatment can significantly inhibit tumor growth and up-regulate the phosphorylation of PKCδ and the expression of aSMase in tumor xenografts developed by subcutaneously implanting PC-3 cells and 67LR-overexpressing PC-3 cells in mice. However, in tumor xenografts formed by subcutaneously implanting 67LR-knockdown PC-3 cells, TF-3 has no significant effect on PKCδ/aSMase pathway regulation and tumor growth inhibition.
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Affiliation(s)
- Lingli Sun
- Tea Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation & Utilization, Guangzhou 510640, China.
| | - Shuai Wen
- Tea Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation & Utilization, Guangzhou 510640, China.
| | - Qiuhua Li
- Tea Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation & Utilization, Guangzhou 510640, China.
| | - Xingfei Lai
- Tea Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation & Utilization, Guangzhou 510640, China.
| | - Ruohong Chen
- Tea Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation & Utilization, Guangzhou 510640, China.
| | - Zhenbiao Zhang
- Tea Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation & Utilization, Guangzhou 510640, China.
| | - Junxi Cao
- Tea Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation & Utilization, Guangzhou 510640, China.
| | - Shili Sun
- Tea Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Tea Plant Resources Innovation & Utilization, Guangzhou 510640, China.
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8
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López-Nieva P, González-Vasconcellos I, González-Sánchez L, Cobos-Fernández MA, Ruiz-García S, Sánchez Pérez R, Aroca Á, Fernández-Piqueras J, Santos J. Differential molecular response in mice and human thymocytes exposed to a combined-dose radiation regime. Sci Rep 2022; 12:3144. [PMID: 35210498 PMCID: PMC8873405 DOI: 10.1038/s41598-022-07166-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 02/11/2022] [Indexed: 11/17/2022] Open
Abstract
In the quest for more effective radiation treatment options that can improve both cell killing and healthy tissue recovery, combined radiation therapies are lately in the spotlight. The molecular response to a combined radiation regime where exposure to an initial low dose (priming dose) of ionizing radiation is administered prior to a subsequent higher radiation dose (challenging dose) after a given latency period have not been thoroughly explored. In this study we report on the differential response to either a combined radiation regime or a single challenging dose both in mouse in vivo and in human ex vivo thymocytes. A differential cell cycle response including an increase in the subG1 fraction on cells exposed to the combined regime was found. Together with this, a differential protein expression profiling in several pathways including cell cycle control (ATM, TP53, p21CDKN1A), damage response (γH2AX) and cell death pathways such as apoptosis (Cleaved Caspase-3, PARP1, PKCδ and H3T45ph) and ferroptosis (xCT/GPX4) was demonstrated. This study also shows the epigenetic regulation following a combined regime that alters the expression of chromatin modifiers such as DNMTs (DNMT1, DNMT2, DNMT3A, DNMT3B, DNMT3L) and glycosylases (MBD4 and TDG). Furthermore, a study of the underlying cellular status six hours after the priming dose alone showed evidence of retained modifications on the molecular and epigenetic pathways suggesting that the priming dose infers a “radiation awareness phenotype” to the thymocytes, a sensitization key to the differential response seen after the second hit with the challenging dose. These data suggest that combined-dose radiation regimes could be more efficient at making cells respond to radiation and it would be interesting to further investigate how can these schemes be of use to potential new radiation therapies.
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Affiliation(s)
- Pilar López-Nieva
- Genome Dynamics and Function Program, Genome Decoding Unit, Severo Ochoa Molecular Biology Center, Madrid, Spain. .,Department of Biology, Madrid Autonomous University, 28049, Madrid, Spain. .,Institute of Health Research, Jiménez Díaz Foundation, 28040, Madrid, Spain.
| | - Iria González-Vasconcellos
- Genome Dynamics and Function Program, Genome Decoding Unit, Severo Ochoa Molecular Biology Center, Madrid, Spain. .,Department of Biology, Madrid Autonomous University, 28049, Madrid, Spain.
| | - Laura González-Sánchez
- Genome Dynamics and Function Program, Genome Decoding Unit, Severo Ochoa Molecular Biology Center, Madrid, Spain.,Institute of Health Research, Jiménez Díaz Foundation, 28040, Madrid, Spain.,Consorcio de Investigación Biomédica de Enfermedades Raras (CIBERER), Madrid, Spain
| | - María A Cobos-Fernández
- Genome Dynamics and Function Program, Genome Decoding Unit, Severo Ochoa Molecular Biology Center, Madrid, Spain.,Department of Biology, Madrid Autonomous University, 28049, Madrid, Spain
| | - Sara Ruiz-García
- Genome Dynamics and Function Program, Genome Decoding Unit, Severo Ochoa Molecular Biology Center, Madrid, Spain.,Department of Biology, Madrid Autonomous University, 28049, Madrid, Spain
| | - Raúl Sánchez Pérez
- Department of Congenital Cardiac Surgery, Hospital Universitario La Paz, 28046, Madrid, Spain
| | - Ángel Aroca
- Department of Congenital Cardiac Surgery, Hospital Universitario La Paz, 28046, Madrid, Spain
| | - José Fernández-Piqueras
- Genome Dynamics and Function Program, Genome Decoding Unit, Severo Ochoa Molecular Biology Center, Madrid, Spain.,Department of Biology, Madrid Autonomous University, 28049, Madrid, Spain.,Institute of Health Research, Jiménez Díaz Foundation, 28040, Madrid, Spain
| | - Javier Santos
- Genome Dynamics and Function Program, Genome Decoding Unit, Severo Ochoa Molecular Biology Center, Madrid, Spain.,Department of Biology, Madrid Autonomous University, 28049, Madrid, Spain.,Institute of Health Research, Jiménez Díaz Foundation, 28040, Madrid, Spain
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9
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Miao LN, Pan D, Shi J, Du JP, Chen PF, Gao J, Yu Y, Shi DZ, Guo M. Role and Mechanism of PKC-δ for Cardiovascular Disease: Current Status and Perspective. Front Cardiovasc Med 2022; 9:816369. [PMID: 35242825 PMCID: PMC8885814 DOI: 10.3389/fcvm.2022.816369] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 01/11/2022] [Indexed: 12/18/2022] Open
Abstract
Protein kinase C (PKC) is a protein kinase with important cellular functions. PKC-δ, a member of the novel PKC subfamily, has been well-documented over the years. Activation of PKC-δ plays an important regulatory role in myocardial ischemia/reperfusion (IRI) injury and myocardial fibrosis, and its activity and expression levels can regulate pathological cardiovascular diseases such as atherosclerosis, hypertension, cardiac hypertrophy, and heart failure. This article aims to review the structure and function of PKC-δ, summarize the current research regarding its activation mechanism and its role in cardiovascular disease, and provide novel insight into further research on the role of PKC-δ in cardiovascular diseases.
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Affiliation(s)
- Li-na Miao
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
- Department of Graduate School, Beijing University of Chinese Medicine, Beijing, China
| | - Deng Pan
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
- Department of Graduate School, Beijing University of Chinese Medicine, Beijing, China
| | - Junhe Shi
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Jian-peng Du
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
- China Heart Institute of Chinese Medicine, China Academy of Chinese Medical Sciences, Beijing, China
| | - Peng-fei Chen
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
| | - Jie Gao
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
- China Heart Institute of Chinese Medicine, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yanqiao Yu
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
- Department of Graduate School, Beijing University of Chinese Medicine, Beijing, China
| | - Da-Zhuo Shi
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
- China Heart Institute of Chinese Medicine, China Academy of Chinese Medical Sciences, Beijing, China
- *Correspondence: Da-Zhuo Shi
| | - Ming Guo
- Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing, China
- China Heart Institute of Chinese Medicine, China Academy of Chinese Medical Sciences, Beijing, China
- Ming Guo
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10
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Patel RS, Rupani R, Impreso S, Lui A, Patel NA. Role of alternatively spliced, pro‐survival Protein Kinase C delta VIII (PKCδVIII) in ovarian cancer. FASEB Bioadv 2021; 4:235-253. [PMID: 35415459 PMCID: PMC8984081 DOI: 10.1096/fba.2021-00090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/26/2021] [Accepted: 11/05/2021] [Indexed: 01/05/2023] Open
Abstract
Ovarian cancer is the deadliest malignant disease in women. Protein Kinase C delta (PRKCD; PKCδ) is serine/threonine kinase extensively linked to various cancers. In humans, PKCδ is alternatively spliced to PKCδI and PKCδVIII. However, the specific function of PKCδ splice variants in ovarian cancer has not been elucidated yet. Hence, we evaluated their expression in human ovarian cancer cell lines (OCC): SKOV3 and TOV112D, along with the normal T80 ovarian cells. Our results demonstrate a marked increase in PKCδVIII in OCC compared to normal ovarian cells. Therefore, we elucidated the role of PKCδVIII and the underlying mechanism of its expression in OCC. Using overexpression and knockdown studies, we demonstrate that PKCδVIII increases cellular survival and migration in OCC. Further, overexpression of PKCδVIII in T80 cells resulted in increased expression of Bcl2 and knockdown of PKCδVIII in OCC decreased Bcl2 expression. Using co‐immunoprecipitations and immunocytochemistry, we demonstrate nuclear localization of PKCδVIII in OCC and further show increased association of PKCδVIII with Bcl2 and Bcl‐xL in OCC. Using PKCδ splicing minigene, mutagenesis, siRNA and antisense oligonucleotides, we demonstrate that increased levels of alternatively spliced PKCδVIII in OCC is regulated by splice factor SRSF2. Finally, we verified that PKCδVIII levels are elevated in samples of human ovarian cancer tissue. The data presented here demonstrate that the alternatively spliced, signaling kinase PKCδVIII is a viable target to develop therapeutics to combat progression of ovarian cancer.
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Affiliation(s)
| | - Rea Rupani
- Department of Molecular Medicine University of South Florida Tampa Florida USA
| | | | - Ashley Lui
- Department of Molecular Medicine University of South Florida Tampa Florida USA
| | - Niketa A. Patel
- James A. Haley Veterans Hospital Tampa Florida USA
- Department of Molecular Medicine University of South Florida Tampa Florida USA
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11
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Neehus AL, Moriya K, Nieto-Patlán A, Le Voyer T, Lévy R, Özen A, Karakoc-Aydiner E, Baris S, Yildiran A, Altundag E, Roynard M, Haake K, Migaud M, Dorgham K, Gorochov G, Abel L, Lachmann N, Dogu F, Haskologlu S, İnce E, El-Benna J, Uzel G, Kiykim A, Boztug K, Roderick MR, Shahrooei M, Brogan PA, Abolhassani H, Hancioglu G, Parvaneh N, Belot A, Ikinciogullari A, Casanova JL, Puel A, Bustamante J. Impaired respiratory burst contributes to infections in PKCδ-deficient patients. J Exp Med 2021; 218:e20210501. [PMID: 34264265 PMCID: PMC8288504 DOI: 10.1084/jem.20210501] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/14/2021] [Accepted: 06/21/2021] [Indexed: 12/24/2022] Open
Abstract
Patients with autosomal recessive protein kinase C δ (PKCδ) deficiency suffer from childhood-onset autoimmunity, including systemic lupus erythematosus. They also suffer from recurrent infections that overlap with those seen in patients with chronic granulomatous disease (CGD), a disease caused by defects of the phagocyte NADPH oxidase and a lack of reactive oxygen species (ROS) production. We studied an international cohort of 17 PKCδ-deficient patients and found that their EBV-B cells and monocyte-derived phagocytes produced only small amounts of ROS and did not phosphorylate p40phox normally after PMA or opsonized Staphylococcus aureus stimulation. Moreover, the patients' circulating phagocytes displayed abnormally low levels of ROS production and markedly reduced neutrophil extracellular trap formation, altogether suggesting a role for PKCδ in activation of the NADPH oxidase complex. Our findings thus show that patients with PKCδ deficiency have impaired NADPH oxidase activity in various myeloid subsets, which may contribute to their CGD-like infectious phenotype.
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Affiliation(s)
- Anna-Lena Neehus
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
- Institute of Experimental Hematology, REBIRTH Research Center for Translational and Regenerative Medicine, Hannover Medical School, Hannover, Germany
| | - Kunihiko Moriya
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
| | - Alejandro Nieto-Patlán
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
- Research and Development in Bioprocess Unit, National School of Biological Sciences, National Polytechnic Institute, Mexico City, Mexico
- National Laboratory for Specialized Services of Investigation, Development and Innovation for Pharma Chemicals and Biotechnological Products, LANSEIDI-FarBiotec-CONACyT, Mexico City, Mexico
| | - Tom Le Voyer
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
| | - Romain Lévy
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
- Pediatric Hematology-Immunology Unit, Necker Hospital for Sick Children, Paris, France
| | - Ahmet Özen
- Department of Pediatrics, Division of Allergy and Immunology, Marmara University, School of Medicine, Istanbul, Turkey
| | - Elif Karakoc-Aydiner
- Department of Pediatrics, Division of Allergy and Immunology, Marmara University, School of Medicine, Istanbul, Turkey
| | - Safa Baris
- Department of Pediatrics, Division of Allergy and Immunology, Marmara University, School of Medicine, Istanbul, Turkey
| | - Alisan Yildiran
- Department of Pediatric Immunology and Allergy, Ondokuz Mayıs University School of Medicine, Samsun, Turkey
| | - Engin Altundag
- Department of Medical Genetics, Ondokuz Mayis University Faculty of Medicine, Samsun, Turkey
| | - Manon Roynard
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
| | - Kathrin Haake
- Institute of Experimental Hematology, REBIRTH Research Center for Translational and Regenerative Medicine, Hannover Medical School, Hannover, Germany
| | - Mélanie Migaud
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
| | - Karim Dorgham
- Sorbonne University, Institut National de la Santé et de la Recherche Médicale, Center for Immunology and Microbial Infections, CIMI-Paris, Assistance Publique–Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Department of Immunology, Paris, France
| | - Guy Gorochov
- Sorbonne University, Institut National de la Santé et de la Recherche Médicale, Center for Immunology and Microbial Infections, CIMI-Paris, Assistance Publique–Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Department of Immunology, Paris, France
| | - Laurent Abel
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Nico Lachmann
- Institute of Experimental Hematology, REBIRTH Research Center for Translational and Regenerative Medicine, Hannover Medical School, Hannover, Germany
| | - Figen Dogu
- Department of Pediatric Immunology and Allergy, Ankara University School of Medicine, Ankara, Turkey
| | - Sule Haskologlu
- Department of Pediatric Immunology and Allergy, Ankara University School of Medicine, Ankara, Turkey
| | - Erdal İnce
- Department of Pediatric Infectious Disease, Ankara University School of Medicine, Ankara, Turkey
| | - Jamel El-Benna
- University of Paris, Institut National de la Santé et de la Recherche Médical U1149, Centre National de la Recherche Scientifique-ERL8252, Paris, France
- Center for Research on Inflammation, Laboratory of Excellence Inflamex, Faculty of Medicine, Xavier Bichat, Paris, France
| | - Gulbu Uzel
- Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD
| | - Ayca Kiykim
- Pediatric Allergy and Immunology, Marmara University Pediatric Training and Research Hospital, Istanbul, Turkey
- Division of Pediatric Allergy and Immunology, Cerrahpasa School of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Kaan Boztug
- CeMM Research Center for Molecular Medicine of the Austrian Academy of Sciences, Vienna, Austria
- St. Anna Children’s Hospital, Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria
- Ludwig Boltzmann Institute for Rare and Undiagnosed Diseases, Vienna, Austria
- St. Anna Children’s Cancer Research Institute, Vienna, Austria
| | - Marion R. Roderick
- Pediatric Immunology and Infectious Disease, Bristol Royal Hospital for Children, Bristol, UK
| | - Mohammad Shahrooei
- Specialized Immunology Laboratory of Dr. Shahrooei, Sina Medical Complex, Ahvaz, Iran
- Department of Microbiology and Immunology, Clinical and Diagnostic Immunology, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Paul A. Brogan
- Infection, Inflammation, and Rheumatology Section, Infection, Immunity, Inflammation and Physiological Medicine Programme, University College London Institute of Child Health, London, UK
| | - Hassan Abolhassani
- Department of Laboratory Medicine, Division of Clinical Immunology, Karolinska Institute at Karolinska University Hospital Huddinge, Stockholm, Sweden
- Research Center for Immunodeficiencies, Tehran University of Medical Sciences, Tehran, Iran
| | - Gonca Hancioglu
- Department of Pediatric Immunology and Allergy, Ondokuz Mayıs University School of Medicine, Samsun, Turkey
| | - Nima Parvaneh
- Department of Pediatrics, Division of Allergy and Clinical Immunology, Tehran University of Medical Sciences, Tehran, Iran
- Research Center for Immunodeficiencies, Tehran University of Medical Sciences, Tehran, Iran
| | - Alexandre Belot
- Reference Center for Rare Rheumatic and Autoimmune Diseases in Children, Pediatric Rheumatology, Hospices Civils de Lyon, Centre International de Recherche en Infectiologie, Institut National de la Santé et de la Recherche Médicale U1111, UMS3444/US8 Lyon University, Lyon, France
| | - Aydan Ikinciogullari
- Department of Pediatric Immunology and Allergy, Ankara University School of Medicine, Ankara, Turkey
| | - Jean-Laurent Casanova
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
- Howard Hughes Medical Institute, New York, NY
| | - Anne Puel
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Jacinta Bustamante
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, Institut National de la Santé et de la Recherche Médicale UMR 1163, Paris, France
- University of Paris, Imagine Institute, Paris, France
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
- Center for the Study of Primary Immunodeficiencies, Necker Hospital for Sick Children, Assistance Publique–Hôpitaux de Paris, Paris, France
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12
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Gao S, Zhao X, Hou L, Ma R, Zhou J, Zhu MX, Pan SJ, Li Y. The interplay between SUMOylation and phosphorylation of PKCδ facilitates oxidative stress-induced apoptosis. FEBS J 2021; 288:6447-6464. [PMID: 34089566 DOI: 10.1111/febs.16050] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/30/2021] [Accepted: 06/03/2021] [Indexed: 12/01/2022]
Abstract
Although the increase in the number of identified posttranslational modifications (PTMs) has substantially improved our knowledge about substrate site specificity of single PTMs, the fact that different types of PTMs can crosstalk and act in concert to exert important regulatory mechanisms for protein function has not gained much attention. Here, we show that protein kinase Cδ (PKCδ) is SUMOylated at lysine 473 in its C-terminal catalytic domain, and the SUMOylation increases PKCδ stability by repressing its ubiquitination. In addition, we uncover a functional interplay between the phosphorylation and SUMOylation of PKCδ, which can strengthen each other through recruiting SUMO E2/E3 ligases and the PKCδ kinase, respectively, to the PKCδ complexes. We identified PIAS2β as the SUMO E3 ligase of PKCδ. More importantly, by enhancing PKCδ protein stability and its phosphorylation through an interdependent interplay of the PTMs, the SUMOylation of PKCδ promotes apoptotic cell death induced by H2 O2 . We conclude that SUMOylation represents an important regulatory mechanism of PKCδ PTMs for the kinase's function in oxidative cell damage.
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Affiliation(s)
- Siman Gao
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, China
| | - Xiangteng Zhao
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, China
| | - Lin Hou
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, China
| | - Ruining Ma
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, China
| | - Jie Zhou
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, China
| | - Michael X Zhu
- Department of Integrative Biology and Pharmacology, McGovern Medical School, The University of Texas Health Science Center at Houston, TX, USA
| | - Si-Jian Pan
- Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, China
| | - Yong Li
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, China
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13
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Speidel JT, Affandi T, Jones DNM, Ferrara SE, Reyland ME. Functional proteomic analysis reveals roles for PKCδ in regulation of cell survival and cell death: Implications for cancer pathogenesis and therapy. Adv Biol Regul 2020; 78:100757. [PMID: 33045516 PMCID: PMC8294469 DOI: 10.1016/j.jbior.2020.100757] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 09/18/2020] [Accepted: 09/21/2020] [Indexed: 12/18/2022]
Abstract
Protein Kinase C-δ (PKCδ), regulates a broad group of biological functions and disease processes, including well-defined roles in immune function, cell survival and apoptosis. PKCδ primarily regulates apoptosis in normal tissues and non-transformed cells, and genetic disruption of the PRKCD gene in mice is protective in many diseases and tissue damage models. However pro-survival/pro-proliferative functions have also been described in some transformed cells and in mouse models of cancer. Recent evidence suggests that the contribution of PKCδ to specific cancers may depend in part on the oncogenic context of the tumor, consistent with its paradoxical role in cell survival and cell death. Here we will discuss what is currently known about biological functions of PKCδ and potential paradigms for PKCδ function in cancer. To further understand mechanisms of regulation by PKCδ, and to gain insight into the plasticity of PKCδ signaling, we have used functional proteomics to identify pathways that are dependent on PKCδ. Understanding how these distinct functions of PKCδ are regulated will be critical for the logical design of therapeutics to target this pathway.
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Affiliation(s)
- Jordan T Speidel
- Department of Craniofacial Biology, School of Dental Medicine, USA
| | - Trisiani Affandi
- Department of Craniofacial Biology, School of Dental Medicine, USA
| | | | - Sarah E Ferrara
- University of Colorado Comprehensive Cancer Center, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
| | - Mary E Reyland
- Department of Craniofacial Biology, School of Dental Medicine, USA.
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14
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The PKC universe keeps expanding: From cancer initiation to metastasis. Adv Biol Regul 2020; 78:100755. [PMID: 33017725 DOI: 10.1016/j.jbior.2020.100755] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 09/15/2020] [Accepted: 09/18/2020] [Indexed: 02/08/2023]
Abstract
Classical and novel protein kinase C (PKC) isozymes (c/nPKCs), members of the PKC family that become activated by the lipid second messenger diacylglycerol (DAG) and phorbol esters, exert a myriad of cellular effects that impact proliferative and motile cellular responses. While c/nPKCs have been indisputably associated with tumor promotion, their roles exceed by far their sole involvement as promoter kinases. Indeed, this original dogma has been subsequently redefined by the introduction of several new concepts: the identification of tumor suppressing roles for c/nPKCs, and their participation in early and late stages of carcinogenesis. This review dives deep into the intricate roles of c/nPKCs in cancer initiation as well as in the different stages of the metastatic cascade, with great emphasis in their involvement in cancer cell motility via regulation of small Rho GTPases, the production of extracellular matrix (ECM)-degrading proteases, and the epithelial-to-mesenchymal transition (EMT) program required for the acquisition of highly invasive traits. Here, we highlight functional interplays between either PKCα or PKCε and mesenchymal features that may ultimately contribute to anticancer drug resistance in cellular and animal models. We also introduce the novel hypothesis that c/nPKCs may be implicated in the control of immune evasion through the regulation of immune checkpoint protein expression. In summary, dissecting the colossal complexity of c/nPKC signaling in the wide spectrum of cancer progression may bring new opportunities for the development of meaningful tools aiding for cancer prognosis and therapy.
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15
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Phosphoproteomic analyses of kidneys of Atlantic salmon infected with Aeromonas salmonicida. Sci Rep 2019; 9:2101. [PMID: 30765835 PMCID: PMC6376026 DOI: 10.1038/s41598-019-38890-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 01/09/2019] [Indexed: 11/08/2022] Open
Abstract
Aeromonas salmonicida (A. salmonicida) is a pathogenic bacterium that causes furunculosis and poses a significant global risk, particularly in economic activities such as Atlantic salmon (Salmo salar) farming. In a previous study, we identified proteins that are significantly upregulated in kidneys of Atlantic salmon challenged with A. salmonicida. Phosphoproteomic analyses were conducted to further clarify the dynamic changes in protein phosphorylation patterns triggered by bacterial infection. To our knowledge, this is the first study to characterize phosphorylation events in proteins from A. salmonicida-infected Atlantic salmon. Overall, we identified over 5635 phosphorylation sites in 3112 proteins, and 1502 up-regulated and 77 down-regulated proteins quantified as a 1.5-fold or greater change relative to control levels. Based on the combined data from proteomic and motif analyses, we hypothesize that five prospective novel kinases (VRK3, GAK, HCK, PKCδ and RSK6) with common functions in inflammatory processes and cellular pathways to regulate apoptosis and the cytoskeleton could serve as potential biomarkers against bacterial propagation in fish. Data from STRING-based functional network analyses indicate that fga is the most central protein. Our collective findings provide new insights into protein phosphorylation patterns, which may serve as effective indicators of A. salmonicida infection in Atlantic salmon.
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16
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Ohm AM, Affandi T, Reyland ME. EGF receptor and PKCδ kinase activate DNA damage-induced pro-survival and pro-apoptotic signaling via biphasic activation of ERK and MSK1 kinases. J Biol Chem 2019; 294:4488-4497. [PMID: 30679314 DOI: 10.1074/jbc.ra118.006944] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 01/16/2019] [Indexed: 01/18/2023] Open
Abstract
DNA damage-mediated activation of extracellular signal-regulated kinase (ERK) can regulate both cell survival and cell death. We show here that ERK activation in this context is biphasic and that early and late activation events are mediated by distinct upstream signals that drive cell survival and apoptosis, respectively. We identified the nuclear kinase mitogen-sensitive kinase 1 (MSK1) as a downstream target of both early and late ERK activation. We also observed that activation of ERK→MSK1 up to 4 h after DNA damage depends on epidermal growth factor receptor (EGFR), as EGFR or mitogen-activated protein kinase/extracellular signal-regulated kinase kinase (MEK)/ERK inhibitors or short hairpin RNA-mediated MSK1 depletion enhanced cell death. This prosurvival response was partially mediated through enhanced DNA repair, as EGFR or MEK/ERK inhibitors delayed DNA damage resolution. In contrast, the second phase of ERK→MSK1 activation drove apoptosis and required protein kinase Cδ (PKCδ) but not EGFR. Genetic disruption of PKCδ reduced ERK activation in an in vivo irradiation model, as did short hairpin RNA-mediated depletion of PKCδ in vitro In both models, PKCδ inhibition preferentially suppressed late activation of ERK. We have shown previously that nuclear localization of PKCδ is necessary and sufficient for apoptosis. Here we identified a nuclear PKCδ→ERK→MSK1 signaling module that regulates apoptosis. We also show that expression of nuclear PKCδ activates ERK and MSK1, that ERK activation is required for MSK1 activation, and that both ERK and MSK1 activation are required for apoptosis. Our findings suggest that location-specific activation by distinct upstream regulators may enable distinct functional outputs from common signaling pathways.
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Affiliation(s)
- Angela M Ohm
- From the Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Trisiani Affandi
- From the Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
| | - Mary E Reyland
- From the Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045
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17
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Lv J, Zeng Y, Qian Y, Dong J, Zhang Z, Zhang J. MicroRNA let-7c-5p improves neurological outcomes in a murine model of traumatic brain injury by suppressing neuroinflammation and regulating microglial activation. Brain Res 2018; 1685:91-104. [PMID: 29408500 DOI: 10.1016/j.brainres.2018.01.032] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 01/01/2018] [Accepted: 01/24/2018] [Indexed: 12/14/2022]
Abstract
MicroRNAs (miRNAs) are a class of non-coding small RNAs that regulate the expression of target genes. They derive from pre-miRNAs that are enzymatically processed by dicer to ∼22 nucleotide mature miRNAs. Members of the pre-miRNA lethal-7 (let-7) are known to regulate cell proliferation and apoptosis. Here, we showed that the level of let-7c-5p, a key member of the let-7 family, was rapidly reduced in the traumatically injured foci in brains of adult C57BL/6J mice and gradually recovered to the pre-injury level 14 days after traumatic brain injury (TBI) induction. This finding led us to test whether upregulating let-7c-5p in murine cerebral tissue by intracerebroventricular injection (ICV) of let-7c-5p mimic could improve the outcomes of mice subjected to controlled cortical impact (CCI). We found that let-7c-5p overexpression attenuated TBI-induced neurological dysfunction and brain edema. The improvements were attributed to let-7c-5p-mediated inhibiting neuroinflammation and attenuation of microglia/macrophage activation, both inhibiting M1 polarization and enhancing M2 polarization. In vitro experiments, we observed that let-7c-5p was decreased in primary microglia activated by LPS treatment or oxygen/glucose deprivation (OGD). Transfection of let-7c-5p mimic suppressed the release of inflammatory mediators in cultured activated primary microglia. In addition, the expressions of caspase-3, a let-7c-5p putative target gene, and the PKC-δ which mediates effect of caspase-3 were inhibited by let-7c-5p in a murine model of TBI. Taken together, these results define the biological activities of cerebral let-7c-5p and delineate its therapeutic potential for improving the neurological outcome of TBI.
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Affiliation(s)
- Jingfang Lv
- Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China; Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China; Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, China; Department of General Surgery, Tianjin General Surgery Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Yong Zeng
- Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China; Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, China; Department of Neurosurgery, Tianjin First Center Hospital, Tianjin, China
| | - Yu Qian
- Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China; Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China; Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, China
| | - Jingfei Dong
- Blood Works Research Institute, Seattle, WA, USA; Division of Hematology, Department of Medicine, University of Washington, School of Medicine, Seattle, WA, USA
| | - Zhixiang Zhang
- Department of General Surgery, Tianjin General Surgery Institute, Tianjin Medical University General Hospital, Tianjin, China
| | - Jianning Zhang
- Department of Neurosurgery, Tianjin Medical University General Hospital, Tianjin, China; Laboratory of Neuro-Trauma, Tianjin Neurological Institute, Tianjin, China; Key Laboratory of Post-trauma Neuro-repair and Regeneration in Central Nervous System, Ministry of Education, Tianjin, China; Tianjin Key Laboratory of Injuries, Variations and Regeneration of Nervous System, Tianjin, China.
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Muscella A, Cossa LG, Vetrugno C, Antonaci G, Marsigliante S. Inhibition of ZL55 cell proliferation by ADP via PKC-dependent signalling pathway. J Cell Physiol 2017; 233:2526-2536. [PMID: 28777435 DOI: 10.1002/jcp.26128] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 08/01/2017] [Indexed: 11/09/2022]
Abstract
Extracellular nucleotides can regulate cell proliferation in both normal and tumorigenic tissues. Here, we studied how extracellular nucleotides regulate the proliferation of ZL55 cells, a mesothelioma-derived cell line obtained from bioptic samples of asbestos-exposed patients. ADP and 2-MeS-ADP inhibited ZL55 cell proliferation, whereas ATP, UTP, and UDP were inactive. The nucleotide potency profile and the blockade of the ADP-mediated inhibitory effect by the phospholipase C inhibitor U-73122 suggest that P2Y1 receptor controls ZL55 cell proliferation. The activation of P2Y1 receptor by ADP leads to activation of intracellular transduction pathways involving [Ca2+ ]i , PKC-δ/PKC-α, and MAPKs, ERK1/2 and JNK1/2. Cell treatment with ADP or 2-MeS-ADP also provokes the activation of p53, causing an accumulation of the G1 cyclin-dependent kinase inhibitors p21WAF1 and p27Kip . Inhibition of ZL55 cell proliferation by ADP was completely reversed by inhibiting MEK1/2, or JNK1/2, or PKC-δ, and PKC-α. Through the inhibition of ADP-activated transductional kinases it was found that PKC-δ was responsible for JNK1/2 activation. JNK1/2 has a role in transcriptional up-regulation of p53, p21WAF1/CIP1 , and p27kip1 . Conversely, the ADP-activated PKC-α provoked ERK1/2 phosphorylation. ERK1/2 increased p53 stabilization, required to G1 arrest of ZL55 cells. Concluding, the importance of the study is twofold: first, results shed light on the mechanism of cell cycle inhibition by ADP; second, results suggest that extracellular ADP may inhibit mesothelioma progression.
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Affiliation(s)
- Antonella Muscella
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (Di.S.Te.B.A.), Universita' del Salento, Lecce, Italy
| | - Luca G Cossa
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (Di.S.Te.B.A.), Universita' del Salento, Lecce, Italy
| | - Carla Vetrugno
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (Di.S.Te.B.A.), Universita' del Salento, Lecce, Italy
| | - Giovanna Antonaci
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (Di.S.Te.B.A.), Universita' del Salento, Lecce, Italy
| | - Santo Marsigliante
- Dipartimento di Scienze e Tecnologie Biologiche e Ambientali (Di.S.Te.B.A.), Universita' del Salento, Lecce, Italy
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Apoptosis by [Pt(O,O'-acac)(γ-acac)(DMS)] requires PKC-δ mediated p53 activation in malignant pleural mesothelioma. PLoS One 2017; 12:e0181114. [PMID: 28704484 PMCID: PMC5507537 DOI: 10.1371/journal.pone.0181114] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 06/25/2017] [Indexed: 12/29/2022] Open
Abstract
Mesothelioma cancer cells have epithelioid or sarcomatoid morphology. The worst prognosis is associated with sarcomatoid phenotype and resistance to therapy is affected by cells heterogeneity. We recently showed that in ZL55 mesothelioma cell line of epithelioid origin [Pt(O,O'-acac)(γ-acac)(DMS)] (Ptac2S) has an antiproliferative effect in vitro and in vivo. Aim of this work was to extend the study on the effects of Ptac2S on ZL34 cell line, representative of sarcomatoid mesothelioma. ZL34 cells were used to assay the antitumor activity of Ptac2S in a mouse xenograft model in vivo. Then, both ZL34 and ZL55 cells were used in order to assess the involvement of p53 protein in (a) the processes underlying the sensitivity to chemotherapy and (b) the activation of various transduction proteins involved in apoptosis/survival processes. Ptac2S increases ZL34 cell death in vivo compared with cisplatin and, in vitro, Ptac2S was more efficacious than cisplatin in inducing apoptosis. In Ptac2S-treated ZL34 and ZL55 cells, p53 regulated gene products of apoptotic BAX and anti-apoptotic Bcl-2 proteins via transcriptional activation. Ptac2S activated PKC-δ and PKC-ε; their inhibition by PKC-siRNA decreased the apoptotic death of cells. PKC-δ was responsible for JNK1/2 activation that has a role in p53 activation. In addition, PKC-ε activation provoked phosphorylation of p38MAPK, concurring to apoptosis. In ZL34 cells, Ptac2S also activated PKC-α thus provoking ERK1/2 activation; inhibition of PKC-α, or ERK1/2, increased Ptac2S cytotoxicity. Results confirm that Ptac2S is a promising therapeutic agent for malignant mesothelioma, giving a substantial starting point for its further validation.
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Lanatoside C, a cardiac glycoside, acts through protein kinase Cδ to cause apoptosis of human hepatocellular carcinoma cells. Sci Rep 2017; 7:46134. [PMID: 28387249 PMCID: PMC5384006 DOI: 10.1038/srep46134] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 03/13/2017] [Indexed: 01/21/2023] Open
Abstract
Recent studies have revealed that cardiac glycosides, such as digitalis and digoxin, have anticancer activity and may serve as lead compounds for the development of cancer treatments. The poor prognosis of hepatocellular carcinoma (HCC) patients reflects the development of resistance to current chemotherapeutic agents, highlighting the need for discovering new small-molecule therapeutics. Here, we found that lanatoside C, an anti-arrhythmic agent extracted from Digitalis lanata, inhibited the growth of HCC cells and dramatically decreased tumor volume as well as delayed tumor growth without obvious body weight loss. Moreover, lanatoside C triggered mitochondrial membrane potential (MMP) loss, activation of caspases and translocation of apoptosis-inducing factor (AIF) into the nucleus, which suggests that lanatoside C induced apoptosis through both caspase-dependent and -independent pathways. Furthermore, we discovered that lanatoside C activated protein kinase delta (PKCδ) via Thr505 phosphorylation and subsequent membrane translocation. Inhibition of PKCδ reversed lanatoside C-induced MMP loss and apoptosis, confirming that lanatoside C caused apoptosis through PKCδ activation. We also found that the AKT/mTOR pathway was negatively regulated by lanatoside C through PKCδ activation. In conclusion, we provide the first demonstration that the anticancer effects of lanatoside C are mainly attributable to PKCδ activation.
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Abstract
More than 0.5 million new cases of head and neck cancer are diagnosed worldwide each year, and approximately 75% of them are treated with radiation alone or in combination with other cancer treatments. A majority of patients treated with radiotherapy develop significant oral off-target effects because of the unavoidable irradiation of normal tissues. Salivary glands that lie within treatment fields are often irreparably damaged and a decline in function manifests as dry mouth or xerostomia. Limited ability of the salivary glands to regenerate lost acinar cells makes radiation-induced loss of function a chronic problem that affects the quality of life of the patients well beyond the completion of radiotherapy. The restoration of saliva production after irradiation has been a daunting challenge, and this review provides an overview of promising gene therapeutics that either improve the gland’s ability to survive radiation insult, or alternately, restore fluid flow after radiation. The salient features and shortcomings of each approach are discussed.
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Affiliation(s)
- Renjith Parameswaran Nair
- Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, Louisiana 71130, United States of America
| | - Gulshan Sunavala-Dossabhoy
- Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, Louisiana 71130, United States of America
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Kinase Signaling in Apoptosis Induced by Saturated Fatty Acids in Pancreatic β-Cells. Int J Mol Sci 2016; 17:ijms17091400. [PMID: 27626409 PMCID: PMC5037680 DOI: 10.3390/ijms17091400] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 08/18/2016] [Accepted: 08/22/2016] [Indexed: 12/12/2022] Open
Abstract
Pancreatic β-cell failure and death is considered to be one of the main factors responsible for type 2 diabetes. It is caused by, in addition to hyperglycemia, chronic exposure to increased concentrations of fatty acids, mainly saturated fatty acids. Molecular mechanisms of apoptosis induction by saturated fatty acids in β-cells are not completely clear. It has been proposed that kinase signaling could be involved, particularly, c-Jun N-terminal kinase (JNK), protein kinase C (PKC), p38 mitogen-activated protein kinase (p38 MAPK), extracellular signal-regulated kinase (ERK), and Akt kinases and their pathways. In this review, we discuss these kinases and their signaling pathways with respect to their possible role in apoptosis induction by saturated fatty acids in pancreatic β-cells.
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Carelli-Alinovi C, Pirolli D, Giardina B, Misiti F. Protein kinase C mediates caspase 3 activation: A role for erythrocyte morphology changes. Clin Hemorheol Microcirc 2016; 59:345-54. [PMID: 24840342 DOI: 10.3233/ch-141845] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We have previously showed that morphological alterations in Red Blood Cells (RBCs) are correlated to an impaired eNOS enzymatic activity and a concomitant reduced NO derived metabolites formation. Here we extend our previous observations, reporting that RBC morphology is regulated by a series of specific cell signaling events linked to Protein Kinase C (PKC)-mediated activation of caspase 3. Pretreatment of RBCs with the PKC inhibitor chelerythrine, prior to the addition of phorbol-12-myristate-13-acetate (PMA), an activator of PKC, blocks the appearance of the morphology alterations and the sustained decrease in nitrates and nitrites levels induced by PMA. Inhibition of PKC also completely inhibits PMA mediated caspase-3 activation. On the other hand, caspase 3 inhibition, lessens the PMA induced-effects on the appearance of RBC morphology alterations, although it enhances PMA-mediated effects on nitric oxide (NO) derived metabolites levels. These data demonstrate that PKC-mediated activation of caspase 3 is an integral and essential part of signaling pathway in RBCs, that may be a regulatory factor of RBC mechanical properties, through regulation of NO metabolism.
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Affiliation(s)
- Cristiana Carelli-Alinovi
- Biochemistry and Clinical Biochemistry Institute, Catholic University, School of Medicine, Rome, Italy
| | - Davide Pirolli
- Biochemistry and Clinical Biochemistry Institute, Catholic University, School of Medicine, Rome, Italy
| | - Bruno Giardina
- Biochemistry and Clinical Biochemistry Institute, Catholic University, School of Medicine, Rome, Italy.,Istituto di Chimica del Riconoscimento Molecolare (ICRM), National Research Council (CNR), Rome, Italy
| | - Francesco Misiti
- Human, Social and Health Department, University of Cassino and Southern Lazio, V.S. Angelo, Loc. Folcara, Cassino (FR), Italy
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Reyland ME, Jones DNM. Multifunctional roles of PKCδ: Opportunities for targeted therapy in human disease. Pharmacol Ther 2016; 165:1-13. [PMID: 27179744 DOI: 10.1016/j.pharmthera.2016.05.001] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The serine-threonine protein kinase, protein kinase C-δ (PKCδ), is emerging as a bi-functional regulator of cell death and proliferation. Studies in PKCδ-/- mice have confirmed a pro-apoptotic role for this kinase in response to DNA damage and a tumor promoter role in some oncogenic contexts. In non-transformed cells, inhibition of PKCδ suppresses the release of cytochrome c and caspase activation, indicating a function upstream of apoptotic pathways. Data from PKCδ-/- mice demonstrate a role for PKCδ in the execution of DNA damage-induced and physiologic apoptosis. This has led to the important finding that inhibitors of PKCδ can be used therapeutically to reduce irradiation and chemotherapy-induced toxicity. By contrast, PKCδ is a tumor promoter in mouse models of mammary gland and lung cancer, and increased PKCδ expression is a negative prognostic indicator in Her2+ and other subtypes of human breast cancer. Understanding how these distinct functions of PKCδ are regulated is critical for the design of therapeutics to target this pathway. This review will discuss what is currently known about biological roles of PKCδ and prospects for targeting PKCδ in human disease.
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Affiliation(s)
- Mary E Reyland
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA.
| | - David N M Jones
- Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, USA
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25
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Muscella A, Vetrugno C, Antonaci G, Cossa LG, Marsigliante S. PKC-δ/PKC-α activity balance regulates the lethal effects of cisplatin. Biochem Pharmacol 2015; 98:29-40. [DOI: 10.1016/j.bcp.2015.08.103] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 08/17/2015] [Indexed: 01/24/2023]
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26
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Abera MB, Kazanietz MG. Protein kinase Cα mediates erlotinib resistance in lung cancer cells. Mol Pharmacol 2015; 87:832-41. [PMID: 25724832 DOI: 10.1124/mol.115.097725] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Overexpression and mutational activation of the epidermal growth factor receptor (EGFR) plays an important role in the pathogenesis of non-small cell lung cancer (NSCLC). EGFR tyrosine-kinase inhibitors (TKIs) are given as a primary therapy for advanced patients with EGFR-activating mutations; however, the majority of these tumors relapse and patients eventually develop resistance to TKIs. To address a potential role of protein kinase C (PKC) isozymes in the resistance to TKIs, we used the isogenic NSCLC H1650 cell line and its erlotinib-resistant derivative H1650-M3, a cell line that displays a mesenchymal-like morphology driven by transforming growth factor-β signaling. We found that H1650-M3 cells display remarkable PKCα upregulation and PKCδ downregulation. Notably, silencing PKCα from H1650-M3 cells using RNA interference caused a significant reduction in the expression of epithelial-to-mesenchymal transition (EMT) markers vimentin, Zeb2, Snail, and Twist. Moreover, pharmacological inhibition or PKCα RNA interference depletion and PKCδ restoring sensitized H1650-M3 cells to erlotinib. Whereas ectopic overexpression of PKCα in parental H1650 cells was not sufficient to alter the expression of EMT genes or to confer resistance to erlotinib, it caused downregulation of PKCδ expression, suggesting a unidirectional crosstalk. Finally, mechanistic studies revealed that PKCα upregulation in H1650-M3 cells is driven by transforming growth factor-β. Our results identified important roles for specific PKC isozymes in erlotinib resistance and EMT in lung cancer cells, and highlight PKCα as a potential target for lung cancer treatment.
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Affiliation(s)
- Mahlet B Abera
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Marcelo G Kazanietz
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
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Mhaidat NM, Bouklihacene M, Thorne RF. 5-Fluorouracil-induced apoptosis in colorectal cancer cells is caspase-9-dependent and mediated by activation of protein kinase C-δ. Oncol Lett 2014; 8:699-704. [PMID: 25013487 PMCID: PMC4081407 DOI: 10.3892/ol.2014.2211] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 05/13/2014] [Indexed: 02/07/2023] Open
Abstract
Elucidation of the molecular mechanisms by which 5-fluorouracil (5-FU) induces apoptosis is required in order to understand the resistance of colorectal cancer (CRC) cells to 5-FU. In the current study, 5-FU-induced apoptosis was assessed using the propidium iodide method. Involvement of protein kinase C (PKC) was assessed by evaluating the extent of their activation in CRC, following treatment with 5-FU, using biochemical inhibitors and western blot analysis. The results revealed that 5-FU induces varying degrees of apoptosis in CRC cells; HCT116 cells were identified to be the most sensitive cells and SW480 were the least sensitive. In addition, 5-FU-induced apoptosis was caspase-dependent as it appeared to be initiated by caspase-9. Furthermore, PKCɛ was marginally expressed in CRC cells and no changes were observed in the levels of cleavage or phosphorylation following treatment with 5-FU. The treatment of HCT116 cells with 5-FU increased the expression, phosphorylation and cleavage of PKCδ. The inhibition of PKCδ was found to significantly inhibit 5-FU-induced apoptosis. These results indicated that 5-FU induces apoptosis in CRC by the activation of PKCδ and caspase-9. In addition, the levels of PKCδ activation may determine the sensitivity of CRC to 5-FU.
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Affiliation(s)
- Nizar M Mhaidat
- Department of Clinical Pharmacy, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Mohammed Bouklihacene
- Department of Clinical Pharmacy, Jordan University of Science and Technology, Irbid 22110, Jordan
| | - Rick F Thorne
- Department of Cancer Research Unit, Newcastle University, Newcastle, NSW 2300, Australia
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Wie SM, Adwan TS, DeGregori J, Anderson SM, Reyland ME. Inhibiting tyrosine phosphorylation of protein kinase Cδ (PKCδ) protects the salivary gland from radiation damage. J Biol Chem 2014; 289:10900-10908. [PMID: 24569990 DOI: 10.1074/jbc.m114.551366] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Radiation therapy for head and neck cancer can result in extensive damage to normal adjacent tissues such as the salivary gland and oral mucosa. We have shown previously that tyrosine phosphorylation at Tyr-64 and Tyr-155 activates PKCδ in response to apoptotic stimuli by facilitating its nuclear import. Here we have identified the tyrosine kinases that mediate activation of PKCδ in apoptotic cells and have explored the use of tyrosine kinase inhibitors for suppression of irradiation-induced apoptosis. We identify the damage-inducible kinase, c-Abl, as the PKCδ Tyr-155 kinase and c-Src as the Tyr-64 kinase. Depletion of c-Abl or c-Src with shRNA decreased irradiation- and etoposide-induced apoptosis, suggesting that inhibitors of these kinases may be useful therapeutically. Pretreatment with dasatinib, a broad spectrum tyrosine kinase inhibitor, blocked phosphorylation of PKCδ at both Tyr-64 and Tyr-155. Expression of "gate-keeper" mutants of c-Abl or c-Src that are active in the presence of dasatinib restored phosphorylation of PKCδ at Tyr-155 and Tyr-64, respectively. Imatinib, a c-Abl-selective inhibitor, also specifically blocked PKCδ Tyr-155 phosphorylation. Dasatinib and imatinib both blocked binding of PKCδ to importin-α and nuclear import, demonstrating that tyrosine kinase inhibitors can inhibit nuclear accumulation of PKCδ. Likewise, pretreatment with dasatinib also suppressed etoposide and radiation induced apoptosis in vitro. In vivo, pre-treatment of mice with dasatinib blocked radiation-induced apoptosis in the salivary gland by >60%. These data suggest that tyrosine kinase inhibitors may be useful prophylactically for protection of nontumor tissues in patients undergoing radiotherapy of the head and neck.
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Affiliation(s)
- Sten M Wie
- Program in Structural Biology and Biochemistry; Department of Craniofacial Biology, School of Dental Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045
| | - Tariq S Adwan
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045
| | - James DeGregori
- Department of Biochemistry and Molecular Genetics, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045
| | - Steven M Anderson
- Department of Pathology, School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045
| | - Mary E Reyland
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045.
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Suzuki S, Franchi L, He Y, Muñoz-Planillo R, Mimuro H, Suzuki T, Sasakawa C, Núñez G. Shigella type III secretion protein MxiI is recognized by Naip2 to induce Nlrc4 inflammasome activation independently of Pkcδ. PLoS Pathog 2014; 10:e1003926. [PMID: 24516390 PMCID: PMC3916413 DOI: 10.1371/journal.ppat.1003926] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Accepted: 12/28/2013] [Indexed: 01/16/2023] Open
Abstract
Recognition of intracellular pathogenic bacteria by members of the nucleotide-binding domain and leucine-rich repeat containing (NLR) family triggers immune responses against bacterial infection. A major response induced by several Gram-negative bacteria is the activation of caspase-1 via the Nlrc4 inflammasome. Upon activation, caspase-1 regulates the processing of proIL-1β and proIL-18 leading to the release of mature IL-1β and IL-18, and induction of pyroptosis. The activation of the Nlrc4 inflammasome requires the presence of an intact type III or IV secretion system that mediates the translocation of small amounts of flagellin or PrgJ-like rod proteins into the host cytosol to induce Nlrc4 activation. Using the Salmonella system, it was shown that Naip2 and Naip5 link flagellin and the rod protein PrgJ, respectively, to Nlrc4. Furthermore, phosphorylation of Nlrc4 at Ser533 by Pkcδ was found to be critical for the activation of the Nlrc4 inflammasome. Here, we show that Naip2 recognizes the Shigella T3SS inner rod protein MxiI and induces Nlrc4 inflammasome activation. The expression of MxiI in primary macrophages was sufficient to induce pyroptosis and IL-1β release, which were prevented in macrophages deficient in Nlrc4. In the presence of MxiI or Shigella infection, MxiI associated with Naip2, and Naip2 interacted with Nlrc4. siRNA-mediated knockdown of Naip2, but not Naip5, inhibited Shigella-induced caspase-1 activation, IL-1β maturation and Asc pyroptosome formation. Notably, the Pkcδ kinase was dispensable for caspase-1 activation and secretion of IL-1β induced by Shigella or Salmonella infection. These results indicate that activation of caspase-1 by Shigella is triggered by the rod protein MxiI that interacts with Naip2 to induce activation of the Nlrc4 inflammasome independently of the Pkcδ kinase. Shigella are bacterial pathogens that are the cause of bacillary dysentery. An important feature of Shigella is their ability to invade the cytoplasm of host epithelial cells and macrophages. A major component of host recognition of Shigella invasion is the activation of the inflammasome, a molecular platform that drives the activation of caspase-1 in macrophages. Although Shigella is known to induce the activation of the Nlrc4 inflammasome, the mechanism by which the bacterium activates Nlrc4 is largely unknown. We discovered that the Shigella T3SS inner rod protein MxiI induces Nlrc4 inflammasome activation through the interaction with host Naip2, which promoted the association of Naip2 with Nlrc4 in macrophages. Expression of MxiI induced caspase-1 activation, Asc oligomerization, pyroptosis and IL-1β release which required Naip2, but not Naip5. Significantly, caspase-1 activation induced by Shigella infection was unaffected by deficiency of the Pkcδ kinase. This study elucidates the microbial-host interactions that drive the activation of the Nlrc4 inflammasome in Shigella-infected macrophages.
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Affiliation(s)
- Shiho Suzuki
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
- Division of Bacterial Infection Biology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
| | - Luigi Franchi
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
- Lycera Corp., Ann Arbor, Michigan, United States of America
| | - Yuan He
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
| | - Raul Muñoz-Planillo
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
| | - Hitomi Mimuro
- Division of Bacteriology, Department of Infectious Diseases Control, International Research Center for Infectious Diseases, Institute of Medical Science, University of Tokyo, Tokyo, Japan
| | - Toshihiko Suzuki
- Department of Molecular Bacteriology and Immunology, Graduate School of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Chihiro Sasakawa
- Division of Bacterial Infection Biology, Institute of Medical Science, University of Tokyo, Tokyo, Japan
- Nippon Institute for Biological Science, Tokyo, Japan
| | - Gabriel Núñez
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
- * E-mail:
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Sviridonov L, Dobkin-Bekman M, Shterntal B, Przedecki F, Formishell L, Kravchook S, Rahamim-Ben Navi L, Bar-Lev TH, Kazanietz MG, Yao Z, Seger R, Naor Z. Differential signaling of the GnRH receptor in pituitary gonadotrope cell lines and prostate cancer cell lines. Mol Cell Endocrinol 2013; 369:107-18. [PMID: 23380421 PMCID: PMC4100609 DOI: 10.1016/j.mce.2013.01.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 01/09/2013] [Accepted: 01/14/2013] [Indexed: 10/27/2022]
Abstract
The GnRH receptor (GnRHR) mediates the pituitary functions of GnRH, as well as its anti-proliferative effects in sex hormone-dependent cancer cells. Here we compare the signaling of GnRHR in pituitary gonadotrope cell lines vs. prostate cancer cell lines. We first noticed that the expression level of PKCα, PKCβII and PKCε is much higher in αT3-1 and LβT2 gonadotrope cell lines vs. LNCaP and DU-145 cell lines, while the opposite is seen for PKCδ. Activation of PKCα, PKCβII and PKCε by GnRH is relatively transient in αT3-1 and LβT2 gonadotrope cell lines and more prolonged in LNCaP and DU-145 cell lines. On the otherhand, the activation and re-distribution of the above PKCs by PMA was similar for both gonadotrope cell lines and prostate cancer cell lines. Activation of ERK1/2 by GnRH and PMA was robust in the gonadotrope cell lines, with a smaller effect observed in the prostate cancer cell lines. The Ca(2+) ionophore A23187 stimulated ERK1/2 in gonadotrope cell lines but not in prostate cancer cell lines. GnRH, PMA and A23187 stimulated JNK activity in gonadotrope cell lines, with a more sustained effect in prostate cancer cell lines. Sustained activation of p38 was observed for PMA and A23187 in Du-145 cells, while p38 activation by GnRH, PMA and A23187 in LβT2 cells was transient. Thus, differential expression and re-distribution of PKCs by GnRH and the transient vs. the more sustained nature of the activation of the PKC-MAPK cascade by GnRH in gonadotrope cell lines vs. prostate cancer cell lines respectively, may provide the mechanistic basis for the cell context-dependent differential biological responses observed in GnRH interaction with pituitary gonadotropes vs. prostate cancer cells.
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Affiliation(s)
- Ludmila Sviridonov
- Department of Biochemistry and Molecular Biology, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv 69978, Israel
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31
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PKCδ enhances C/EBPα degradation via inducing its phosphorylation and cytoplasmic translocation. Biochem Biophys Res Commun 2013; 433:220-5. [DOI: 10.1016/j.bbrc.2013.02.087] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 02/26/2013] [Indexed: 11/24/2022]
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Nanoparticle-mediated gene silencing confers radioprotection to salivary glands in vivo. Mol Ther 2013; 21:1182-94. [PMID: 23511246 DOI: 10.1038/mt.2013.42] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Radiation treatment of head and neck cancers causes irreversible damage of the salivary glands (SG). Here, we introduce a preclinical mouse model for small-interfering RNA (siRNA)-based gene silencing to provide protection of SG from radiation-induced apoptosis. Novel, pH-responsive nanoparticles complexed with siRNAs were introduced into mouse submandibular glands (SMG) by retroductal injection to modulate gene expression in vivo. To validate this approach, we first targeted Nkcc1, an ion transporter that is essential for saliva secretion. Nkcc1 siRNA delivery resulted in efficient knockdown, as quantified at the mRNA and the protein levels, and the functional result of Nkcc1 knockdown phenocopied the severe decrease in saliva secretion, characteristic of the systemic Nkcc1 gene knockout. To establish a strategy to prevent apoptotic cell loss due to radiation damage, siRNAs targeting the proapoptotic Pkcδ gene were administered into SMG before ionizing radiation. Knockdown of Pkcδ not only reduced the number of apoptotic cells during the acute phase of radiation damage, but also markedly improved saliva secretion at 3 months in irradiated animals, indicating that this treatment confers protection from hyposalivation. These results demonstrate that nanoparticle delivery of siRNAs targeting a proapoptotic gene is a localized, nonviral, and effective means of conferring radioprotection to the SGs.
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Allen-Petersen BL, Carter CJ, Ohm AM, Reyland ME. Protein kinase Cδ is required for ErbB2-driven mammary gland tumorigenesis and negatively correlates with prognosis in human breast cancer. Oncogene 2013; 33:1306-15. [PMID: 23474764 DOI: 10.1038/onc.2013.59] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 12/04/2012] [Accepted: 12/21/2012] [Indexed: 02/07/2023]
Abstract
Protein kinase C δ (PKCδ) regulates apoptosis in the mammary gland, however, the functional contribution of PKCδ to the development or progression of breast cancer has yet to be determined. Meta-analysis of ErbB2-positive breast cancers shows increased PKCδ expression, and a negative correlation between PKCδ expression and prognosis. Here, we present in-vivo evidence that PKCδ is essential for the development of mammary gland tumors in a ErbB2-overexpressing transgenic mouse model, and in-vitro evidence that PKCδ is required for proliferative signaling downstream of the ErbB2 receptor. Mouse mammary tumor virus (MMTV)-ErbB2 mice lacking PKCδ (δKO) have increased tumor latency compared with MMTV-ErbB2 wild-type (δWT) mice, and the tumors show a dramatic decrease in Ki-67 staining. To explore the relationship between PKCδ and ErbB2-driven proliferation more directly, we used MCF-10A cells engineered to express a synthetic ligand-inducible form of the ErbB2 receptor. Depletion of PKCδ with short hairpin RNA inhibited ligand-induced growth in both two-dimensional (2D) (plastic) and three-dimensional (3D) (Matrigel) culture, and correlated with decreased phosphorylation of the ErbB2 receptor and reduced activation of Src and MAPK/ERK pathways. Similarly, in human breast cancer cell lines in which ErbB2 is overexpressed, depletion of PKCδ suppresses proliferation, Src and ERK activation. PKCδ appears to drive proliferation through the formation of an active ErbB2/PKCδ/Src signaling complex, as depletion of PKCδ disrupts association of Src with the ErbB2 receptor. Taken together, our studies present the first evidence that PKCδ is a critical regulator of ErbB2-mediated tumorigenesis, and suggest further investigation of PKCδ as a target in ErbB2-positive breast cancer.
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Affiliation(s)
- B L Allen-Petersen
- Program in Cell Biology, Stem Cells and Development, School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO, USA
| | - C J Carter
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO, USA
| | - A M Ohm
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO, USA
| | - M E Reyland
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO, USA
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Choi JS, Oh JI, Na M, Lee SK, Joo SH. PKCδ promotes etoposide-induced cell death by phosphorylating Hsp27 in HeLa cells. Biochem Biophys Res Commun 2012; 426:590-5. [DOI: 10.1016/j.bbrc.2012.08.132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2012] [Accepted: 08/25/2012] [Indexed: 10/27/2022]
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Arany S, Xu Q, Hernady E, Benoit DSW, Dewhurst S, Ovitt CE. Pro-apoptotic gene knockdown mediated by nanocomplexed siRNA reduces radiation damage in primary salivary gland cultures. J Cell Biochem 2012; 113:1955-65. [PMID: 22253051 DOI: 10.1002/jcb.24064] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A critical issue in the management of head and neck tumors is radioprotection of the salivary glands. We have investigated whether siRNA-mediated gene knock down of pro-apoptotic mediators can reduce radiation-induced cellular apoptosis in salivary gland cells in vitro. We used novel, pH-responsive nanoparticles to deliver functionally active siRNAs into cultures of salivary gland cells. The nanoparticle molecules are comprised of cationic micelles that electrostatically interact with the siRNA, protecting it from nuclease attack, and also include pH-responsive endosomolytic constituents that promote release of the siRNA into the target cell cytoplasm. Transfection controls with Cy3-tagged siRNA/nanoparticle complexes showed efficiently internalized siRNAs in more than 70% of the submandibular gland cells. We found that introduction of siRNAs specifically targeting the Pkcδ or Bax genes significantly blocked the induction of these pro-apoptotic proteins that normally occurs after radiation in cultured salivary gland cells. Furthermore, the level of cell death from subsequent radiation, as measured by caspase-3, TUNEL, and mitochondrial disruption assays, was significantly decreased. Thus, we have successfully demonstrated that the siRNA/nanoparticle-mediated knock down of pro-apoptotic genes can prevent radiation-induced damage in submandibular gland primary cell cultures.
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Affiliation(s)
- Szilvia Arany
- Center for Oral Biology, Department of Microbiology and Immunology, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, USA.
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Arango D, Parihar A, Villamena FA, Wang L, Freitas MA, Grotewold E, Doseff AI. Apigenin induces DNA damage through the PKCδ-dependent activation of ATM and H2AX causing down-regulation of genes involved in cell cycle control and DNA repair. Biochem Pharmacol 2012; 84:1571-80. [PMID: 22985621 DOI: 10.1016/j.bcp.2012.09.005] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Revised: 09/04/2012] [Accepted: 09/10/2012] [Indexed: 12/30/2022]
Abstract
Apigenin, an abundant plant flavonoid, exhibits anti-proliferative and anti-carcinogenic activities through mechanisms yet not fully defined. In the present study, we show that the treatment of leukemia cells with apigenin resulted in the induction of DNA damage preceding the activation of the apoptotic program. Apigenin-induced DNA damage was mediated by p38 and protein kinase C-delta (PKCδ), yet was independent of reactive oxygen species or caspase activity. Treatment of monocytic leukemia cells with apigenin induced the phosphorylation of the ataxia-telangiectasia mutated (ATM) kinase and histone H2AX, two key regulators of the DNA damage response, without affecting the ataxia-telangiectasia mutated and Rad-3-related (ATR) kinase. Silencing and pharmacological inhibition of PKCδ abrogated ATM and H2AX phosphorylation, whereas inhibition of p38 reduced H2AX phosphorylation independently of ATM. We established that apigenin delayed cell cycle progression at G1/S and increased the number of apoptotic cells. In addition, genome-wide mRNA analyses showed that apigenin-induced DNA damage led to down-regulation of genes involved in cell-cycle control and DNA repair. Taken together, the present results show that the PKCδ-dependent activation of ATM and H2AX define the signaling networks responsible for the regulation of DNA damage promoting genome-wide mRNA alterations that result in cell cycle arrest, hence contributing to the anti-carcinogenic activities of this flavonoid.
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Affiliation(s)
- Daniel Arango
- Department of Molecular Genetics, The Ohio State University, Columbus, OH 43210, USA
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Protein kinase cδ in apoptosis: a brief overview. Arch Immunol Ther Exp (Warsz) 2012; 60:361-72. [PMID: 22918451 DOI: 10.1007/s00005-012-0188-8] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2011] [Accepted: 08/06/2012] [Indexed: 12/21/2022]
Abstract
Protein kinase C-delta (PKCδ), a member of the lipid-regulated serine/threonine PKC family, has been implicated in a wide range of important cellular processes. In the past decade, the critical role of PKCδ in the regulation of both intrinsic and extrinsic apoptosis pathways has been widely explored. In most cases, over-expression or activation of PKCδ results in the induction of apoptosis. The phosphorylations and multiple cell organelle translocations of PKCδ initiate apoptosis by targeting multiple downstream effectors. During apoptosis, PKCδ is proteolytically cleaved by caspase-3 to generate a constitutively activated catalytic fragment, which amplifies apoptosis cascades in nucleus and mitochondria. However, PKCδ also exerts its anti-apoptotic and pro-survival roles in some cases. Therefore, the complicated role of PKCδ in apoptosis appears to be stimulus and cell type dependent. This review is mainly focused on how PKCδ gets activated in diverse ways in response to apoptotic signals and how PKCδ targets different downstream regulators to sponsor or restrain apoptosis induction.
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38
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Iida K, Zheng R, Shen R, Nanus DM. Adenoviral neutral endopeptidase gene delivery in combination with paclitaxel for the treatment of prostate cancer. Int J Oncol 2012; 41:1192-8. [PMID: 22895534 PMCID: PMC3583657 DOI: 10.3892/ijo.2012.1586] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Accepted: 07/02/2012] [Indexed: 11/09/2022] Open
Abstract
Neutral endopeptidase (NEP) is a cell-surface peptidase that inhibits prostate cancer cell growth partly via inhibition of Akt kinase. We investigated the antitumor effects of an adenovirus gene delivery system (AdNEP) to restore NEP expression in DU145 prostate cancer cells in combination with paclitaxel chemotherapy. DU145 cells were infected with adenovirus expressing NEP or LacZ, treated with paclitaxel, and assessed for cell viability, Akt activation and induction of apoptosis. Athymic mice with established DU145 xenografts were injected intratumorally with AdNEP or AdLacZ and intraperitoneally with paclitaxel and monitored for tumor growth over 28 days. Compared to AdLacZ plus paclitaxel, AdNEP plus paclitaxel significantly inhibited DU145 cell growth and increased apoptosis as determined by increased caspase-3 and PARP-1 proteolytic fragments. In a xenograft model, tumor volume was reduced in mice treated with AdNEP plus paclitaxel (122.85±89.5 mm3; P<0.01) compared with mice treated with AdNEP plus saline (653.9±230.3 mm3), AdLacZ plus paclitaxel (575.9±176.6 mm3) or AdLacZ plus saline (920.2±238.2 mm3). In conclusion, these data suggest that NEP can augment taxane-induced apoptosis through inhibition of Akt/Bad signaling, and that the combination of NEP plus paclitaxel may be an effective strategy to inhibit castration-resistant prostate cancer growth.
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Affiliation(s)
- Katsuyuki Iida
- Genitourinary Oncology Research Laboratory, Department of Medicine, Weill Cornell Medical College and Weill Cornell Cancer Center, New York, NY, USA
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39
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Cao Y, Zhao Z, Eckert RL, Reece EA. The essential role of protein kinase Cδ in diabetes-induced neural tube defects. J Matern Fetal Neonatal Med 2012; 25:2020-4. [PMID: 22463764 DOI: 10.3109/14767058.2012.677963] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
BACKGROUND Maternal diabetes causes neural tube defects (NTDs) in the embryos via activating protein kinase Cs (PKCs), which regulate programmed cell death (apoptosis). The aims of this study are to investigate the role of proapoptotic PKCδ in NTD formation and the underlying mechanisms. METHODS PKCδ heterozygous (pkcδ(+/-)) female mice were diabetic (DM) induced by intravenous injection of streptozotocin. Occurrence of NTDs was evaluated at embryonic day 11.5 and compared between wild type (WT) and PKCδ homozygous (pkcδ(-/-)) embryos. Changes in oxidative and endoplasmic reticulum (ER) stress-associated factors and stress-response c-Jun N-terminal kinases (JNKs) were assessed using Western blot assay. RESULTS Compared to DM/WT, the DM/PKCδ(-/-) embryos had significantly lower NTD rate and lower levels of oxidative and ER stress factors and JNK activation. These values were similar to those in the non-diabetic control group. CONCLUSION PKCδ plays a critical role in diabetes-induced NTDs, potentially through increasing oxidative and ER stress and JNK-associated stress-response pathways.
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Affiliation(s)
- Yuanning Cao
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Maryland School of Medicine, Baltimore, MD 21201, USA
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40
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Chen MB, Wu XY, Gu JH, Guo QT, Shen WX, Lu PH. Activation of AMP-activated protein kinase contributes to doxorubicin-induced cell death and apoptosis in cultured myocardial H9c2 cells. Cell Biochem Biophys 2011; 60:311-22. [PMID: 21274754 DOI: 10.1007/s12013-011-9153-0] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Despite its potent antitumor effect, clinical use of Doxorubicin is limited because of serious side effects including myocardial toxicity. Understanding the cellular mechanism involved in this process in a better manner is beneficial for optimizing Doxorubicin treatment. In the current study, the authors focus on the AMP-activated protein kinase (AMPK) in the said process. In this study, the authors discovered for the first time that Doxorubicin induces AMPK activation in cultured rat embryonic ventricular myocardial H9c2 cells. Reactive oxygen species (ROS)-dependent LKB1 activation serves as the upstream signal for AMPK activation by Doxorubicin. Evidence in support of the activation of AMPK contributing to Doxorubicin-induced H9c2 cell death/apoptosis--probably by modulating multiple downstream signal targets, including regulating JNK, p53, and inhibiting mTORC1--is provided in this article.
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Affiliation(s)
- Min-Bin Chen
- Department of Medical Oncology, Kunshan First People's Hospital Affiliated to Jiangsu University, 91 Qianjin Road, Kunshan 215300, Jiangsu Province, China.
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41
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DNA damage response signaling triggers nuclear localization of the chicken anemia virus protein Apoptin. J Virol 2011; 85:12638-49. [PMID: 21937663 DOI: 10.1128/jvi.05009-11] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The chicken anemia virus (CAV) protein Apoptin is a small, 13.6-kDa protein that has the intriguing activity of inducing G(2)/M arrest and apoptosis specifically in cancer cells by a mechanism that is independent of p53. The activity of Apoptin is regulated at the level of localization. Whereas Apoptin is cytoplasmic in primary cells and does not affect cell growth, in transformed cells it localizes to the nucleus, where it induces apoptosis. The properties of cancer cells that are responsible for activating the proapoptotic activities of Apoptin remain unclear. In the current study, we show that DNA damage response (DDR) signaling is required to induce Apoptin nuclear localization in primary cells. Induction of DNA damage in combination with Apoptin expression was able to induce apoptosis in primary cells. Conversely, chemical or RNA interference (RNAi) inhibition of DDR signaling by ATM and DNA-dependent protein kinase (DNA-PK) was sufficient to cause Apoptin to localize in the cytoplasm of transformed cells. Furthermore, the nucleocytoplasmic shuttling activity of Apoptin is required for DDR-induced changes in localization. Interestingly, nuclear localization of Apoptin in primary cells was able to inhibit the formation of DNA damage foci containing 53BP1. Apoptin has been shown to bind and inhibit the anaphase-promoting complex/cyclosome (APC/C). We observe that Apoptin is able to inhibit formation of DNA damage foci by targeting the APC/C-associated factor MDC1 for degradation. We suggest that these results may point to a novel mechanism of DDR inhibition during viral infection.
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42
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Adwan TS, Ohm AM, Jones DNM, Humphries MJ, Reyland ME. Regulated binding of importin-α to protein kinase Cδ in response to apoptotic signals facilitates nuclear import. J Biol Chem 2011; 286:35716-35724. [PMID: 21865164 DOI: 10.1074/jbc.m111.255950] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
PKCδ translocates into the nucleus in response to apoptotic agents and functions as a potent cell death signal. Cytoplasmic retention of PKCδ and its transport into the nucleus are essential for cell homeostasis, but how these processes are regulated is poorly understood. We show that PKCδ resides in the cytoplasm in a conformation that precludes binding of importin-α. A structural model of PKCδ in the inactive state suggests that the nuclear localization sequence (NLS) is prevented from binding to importin-α through intramolecular contacts between the C2 and catalytic domains. We have previously shown that PKCδ is phosphorylated on specific tyrosine residues in response to apoptotic agents. Here, we show that phosphorylation of PKCδ at Tyr-64 and Tyr-155 results in a conformational change that allows exposure of the NLS and binding of importin-α. In addition, Hsp90 binds to PKCδ with similar kinetics as importin-α and is required for the interaction of importin-α with the NLS. Finally, we elucidate a role for a conserved PPxxP motif, which overlaps the NLS, in nuclear exclusion of PKCδ. Mutagenesis of the conserved prolines to alanines enhanced importin-α binding to PKCδ and induced its nuclear import in resting cells. Thus, the PPxxP motif is important for maintaining a conformation that facilitates cytosplasmic retention of PKCδ. Taken together, this study establishes a novel mechanism that retains PKCδ in the cytoplasm of resting cells and regulates its nuclear import in response to apoptotic stimuli.
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Affiliation(s)
- Tariq S Adwan
- Program in Cell Biology, Stem Cells and Development, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045
| | - Angela M Ohm
- Department of Craniofacial Biology, School of Dental Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045
| | - David N M Jones
- Department of Pharmacology, School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045
| | - Michael J Humphries
- Program in Cell Biology, Stem Cells and Development, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045
| | - Mary E Reyland
- Program in Cell Biology, Stem Cells and Development, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045; Department of Craniofacial Biology, School of Dental Medicine, University of Colorado, Anschutz Medical Campus, Aurora, Colorado 80045.
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Latchoumycandane C, Anantharam V, Jin H, Kanthasamy A, Kanthasamy A. Dopaminergic neurotoxicant 6-OHDA induces oxidative damage through proteolytic activation of PKCδ in cell culture and animal models of Parkinson's disease. Toxicol Appl Pharmacol 2011; 256:314-23. [PMID: 21846476 DOI: 10.1016/j.taap.2011.07.021] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Revised: 07/25/2011] [Accepted: 07/27/2011] [Indexed: 11/26/2022]
Abstract
The neurotoxicant 6-hydroxydopamine (6-OHDA) is used to investigate the cellular and molecular mechanisms underlying selective degeneration of dopaminergic neurons in Parkinson's disease (PD). Oxidative stress and caspase activation contribute to the 6-OHDA-induced apoptotic cell death of dopaminergic neurons. In the present study, we sought to systematically characterize the key downstream signaling molecule involved in 6-OHDA-induced dopaminergic degeneration in cell culture and animal models of PD. Treatment of mesencephalic dopaminergic neuronal N27 cells with 6-OHDA (100 μM) for 24h significantly reduced mitochondrial activity and increased cytosolic cytochrome c, followed by sequential activation of caspase-9 and caspase-3. Co-treatment with the free radical scavenger MnTBAP (10 μM) significantly attenuated 6-OHDA-induced caspase activities. Interestingly, 6-OHDA induced proteolytic cleavage and activation of protein kinase C delta (PKCδ) was completely suppressed by treatment with a caspase-3-specific inhibitor, Z-DEVD-FMK (50 μM). Furthermore, expression of caspase-3 cleavage site-resistant mutant PKCδ(D327A) and kinase dead PKCδ(K376R) or siRNA-mediated knockdown of PKCδ protected against 6-OHDA-induced neuronal cell death, suggesting that caspase-3-dependent PKCδ promotes oxidative stress-induced dopaminergic degeneration. Suppression of PKCδ expression by siRNA also effectively protected N27 cells from 6-OHDA-induced apoptotic cell death. PKCδ cleavage was also observed in the substantia nigra of 6-OHDA-injected C57 black mice but not in control animals. Viral-mediated delivery of PKCδ(D327A) protein protected against 6-OHDA-induced PKCδ activation in mouse substantia nigra. Collectively, these results strongly suggest that proteolytic activation of PKCδ is a key downstream event in dopaminergic degeneration, and these results may have important translational value for development of novel treatment strategies for PD.
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Affiliation(s)
- Calivarathan Latchoumycandane
- Parkinson's Disorder Research Laboratory, Iowa Center for Advanced Neurotoxicology, Department of Biomedical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011-1250, USA
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Duquesnes N, Lezoualc'h F, Crozatier B. PKC-delta and PKC-epsilon: foes of the same family or strangers? J Mol Cell Cardiol 2011; 51:665-73. [PMID: 21810427 DOI: 10.1016/j.yjmcc.2011.07.013] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2011] [Revised: 06/24/2011] [Accepted: 07/15/2011] [Indexed: 11/30/2022]
Abstract
Protein kinase C (PKC) is a family of 10 serine/threonine kinases divided into 3 subfamilies, classical, novel and atypical classes. Two PKC isozymes of the novel group, PKCε and PKCδ, have different and sometimes opposite effects. PKCε stimulates cell growth and differentiation while PKCδ is apoptotic. In the heart, they are among the most expressed PKC isozymes and they are opposed in the preconditioning process with a positive role of PKCε and an inhibiting role of PKCδ. The goal of this review is to analyze the structural differences of these 2 enzymes that may explain their different behaviors and properties.
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45
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Allen-Petersen BL, Miller MR, Neville MC, Anderson SM, Nakayama KI, Reyland ME. Loss of protein kinase C delta alters mammary gland development and apoptosis. Cell Death Dis 2011; 1:e17. [PMID: 21364618 PMCID: PMC3032509 DOI: 10.1038/cddis.2009.20] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
As apoptotic pathways are commonly deregulated in breast cancer, exploring how mammary gland cell death is regulated is critical for understanding human disease. We show that primary mammary epithelial cells from protein kinase C delta (PKCδ) −/− mice have a suppressed response to apoptotic agents in vitro. In the mammary gland in vivo, apoptosis is critical for ductal morphogenesis during puberty and involution following lactation. We have explored mammary gland development in the PKCδ −/− mouse during these two critical windows. Branching morphogenesis was altered in 4- to 6-week-old PKCδ −/− mice as indicated by reduced ductal branching; however, apoptosis and proliferation in the terminal end buds was unaltered. Conversely, activation of caspase-3 during involution was delayed in PKCδ −/− mice, but involution proceeded normally. The thymus also undergoes apoptosis in response to physiological signals. A dramatic suppression of caspase-3 activation was observed in the thymus of PKCδ −/− mice treated with irradiation, but not mice treated with dexamethasone, suggesting that there are both target- and tissue-dependent differences in the execution of apoptotic pathways in vivo. These findings highlight a role for PKCδ in both apoptotic and nonapoptotic processes in the mammary gland and underscore the redundancy of apoptotic pathways in vivo.
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Affiliation(s)
- B L Allen-Petersen
- Stem Cells and Development, School of Medicine, University of Colorado Denver, Aurora, CO 80045, USA
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46
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Shin EJ, Duong CX, Nguyen XKT, Bing G, Bach JH, Park DH, Nakayama K, Ali SF, Kanthasamy AG, Cadet JL, Nabeshima T, Kim HC. PKCδ inhibition enhances tyrosine hydroxylase phosphorylation in mice after methamphetamine treatment. Neurochem Int 2011; 59:39-50. [PMID: 21672585 DOI: 10.1016/j.neuint.2011.03.022] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2011] [Accepted: 03/22/2011] [Indexed: 11/26/2022]
Abstract
The present study was designed to evaluate the specific role of protein kinase C (PKC) δ in methamphetamine (MA)-induced dopaminergic toxicity. A multiple-dose administration regimen of MA significantly increases PKCδ expression, while rottlerin, a PKCδ inhibitor, significantly attenuates MA-induced hyperthermia and behavioral deficits. These behavioral effects were not significantly observed in PKCδ antisense oligonucleotide (ASO)-treated- or PKCδ knockout (-/-)-mice. There were no MA-induced significant decreases of dopamine (DA) content or tyrosine hydroxylase (TH) expression in the striatum in rottlerin-treated-, ASO-treated- or PKCδ (-/-)-mice. The administration of MA also results in a significant decrease of TH phosphorylation at ser 40, but not ser 31, while the inhibition of PKCδ consistently and significantly attenuates MA-induced reduction in the phosphorylation of TH at ser 40. Therefore, these results suggest that the MA-induced enhancement of PKCδ expression is a critical factor in the impairment of TH phosphorylation at ser 40 and that pharmacological or genetic inhibition of PKCδ may be protective against MA-induced dopaminergic neurotoxicity in vivo.
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Affiliation(s)
- Eun-Joo Shin
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon 200-701, South Korea
| | - Chu Xuan Duong
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon 200-701, South Korea
| | - Xuan-Khanh Thi Nguyen
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon 200-701, South Korea
| | - Guoying Bing
- Department of Anatomy and Neurobiology, College of Medicine, University of Kentucky, Lexington, KY 40536, USA
| | - Jae-Hyung Bach
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon 200-701, South Korea
| | - Dae Hun Park
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon 200-701, South Korea
| | - Keiichi Nakayama
- Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, Fukuoka 812-8582, Japan
| | - Syed F Ali
- Division of Neurotoxicology, National Center of Toxicological Research, FDA, Jefferson, Arkansas 72079, USA
| | - Anumantha G Kanthasamy
- Parkinson's Disorder Research Laboratory, Iowa Center for Advanced Neurotoxicology, Department of Biomedical Sciences, Iowa State University, Ames, IA 50011, USA
| | - Jean L Cadet
- Molecular Neuropsychiatry Research Branch, DHHS/NIH/NIDA Intramural Research Program, Baltimore, MD 21224, USA
| | - Toshitaka Nabeshima
- Department of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, Meijo University, Nagoya 468-8503, Japan
| | - Hyoung-Chun Kim
- Neuropsychopharmacology and Toxicology Program, College of Pharmacy, Kangwon National University, Chunchon 200-701, South Korea
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47
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Kim JD, Seo KW, Lee EA, Quang NN, Cho HR, Kwon B. A novel mouse PKCδ splice variant, PKCδIX, inhibits etoposide-induced apoptosis. Biochem Biophys Res Commun 2011; 410:177-82. [PMID: 21549093 DOI: 10.1016/j.bbrc.2011.04.096] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2011] [Accepted: 04/20/2011] [Indexed: 12/13/2022]
Abstract
Protein kinase C (PKC) δ plays an important role in cellular proliferation and apoptosis. The catalytic fragment of PKCδ generated by caspase-dependent cleavage is essential for the initiation of etoposide-induced apoptosis. In this study, we identified a novel mouse PKCδ isoform named PKCδIX (Genebank Accession No. HQ840432). PKCδIX is generated by alternative splicing and is ubiquitously expressed, as seen in its full-length PKCδ. PKCδIX lacks the C1 domain, the caspase 3 cleavage site, and the ATP binding site but preserves an almost intact c-terminal catalytic domain and a nuclear localization signal (NLS). The structural characteristics of PKCδIX provided a possibility that this PKCδ isozyme functions as a novel dominant-negative form for PKCδ due to its lack of the ATP-binding domain that is required for the kinase activity of PKCδ. Indeed, overexpression of PKCδIX significantly inhibited etoposide-induced apoptosis in NIH3T3 cells. In addition, an in vitro kinase assay showed that recombinant PKCδIX protein could competitively inhibit the kinase activity of PKCδ. We conclude that PKCδIX can function as a natural dominant-negative inhibitor of PKCδin vivo.
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Affiliation(s)
- Jung D Kim
- School of Biological Sciences, University of Ulsan, Ulsan, Republic of Korea
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48
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Liu S, Yuan Q, Zhao S, Wang J, Guo Y, Wang F, Zhang Y, Liu Q, Zhang S, Ling EA, Hao A. High glucose induces apoptosis in embryonic neural progenitor cells by a pathway involving protein PKCδ. Cell Signal 2011; 23:1366-74. [PMID: 21440619 DOI: 10.1016/j.cellsig.2011.03.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2011] [Revised: 03/15/2011] [Accepted: 03/18/2011] [Indexed: 11/29/2022]
Abstract
Diabetic-induced neural tube defects in embryos are caused by apoptosis of neural progenitor cells (NPCs); however, the underlying mechanisms are poorly understood. The present study is aimed to investigate the specific cellular proteins that may be involved in apoptosis of NPCs. We show here that hyperglycemia-induced apoptosis of NPCs was through a PKCδ-dependent mechanism. Tyrosine phosphorylation of PKCδ was required for PKCδ binding to c-Abl in the cytoplasm, and inhibition of c-Abl by STI571 or knock-down of c-Abl by RNAi decreased the phosphorylation of PKCδ. Moreover, translocation of PKCδ and c-Abl complex from the cytoplasm to the nucleus, was blocked by down-regulation of PKCδ or c-Abl. Furthermore, we found that interaction of PKCδ and c-Abl played a crucial role in p53 accumulation in the nucleus, which was linked to the apoptosis of NPCs in response to high glucose.
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Affiliation(s)
- Shangming Liu
- Department of Histology and Embryology, Key Laboratory of the Ministry of Education for Experimental Teratology, Shandong University School of Medicine, 44#, Wenhua Xi Road, Jinan, Shandong, 250012, PR China
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49
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Burguillos MA, Deierborg T, Kavanagh E, Persson A, Hajji N, Garcia-Quintanilla A, Cano J, Brundin P, Englund E, Venero JL, Joseph B. Caspase signalling controls microglia activation and neurotoxicity. Nature 2011; 472:319-24. [PMID: 21389984 DOI: 10.1038/nature09788] [Citation(s) in RCA: 444] [Impact Index Per Article: 34.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Accepted: 12/23/2010] [Indexed: 01/05/2023]
Abstract
Activation of microglia and inflammation-mediated neurotoxicity are suggested to play a decisive role in the pathogenesis of several neurodegenerative disorders. Activated microglia release pro-inflammatory factors that may be neurotoxic. Here we show that the orderly activation of caspase-8 and caspase-3/7, known executioners of apoptotic cell death, regulate microglia activation through a protein kinase C (PKC)-δ-dependent pathway. We find that stimulation of microglia with various inflammogens activates caspase-8 and caspase-3/7 in microglia without triggering cell death in vitro and in vivo. Knockdown or chemical inhibition of each of these caspases hindered microglia activation and consequently reduced neurotoxicity. We observe that these caspases are activated in microglia in the ventral mesencephalon of Parkinson's disease (PD) and the frontal cortex of individuals with Alzheimer's disease (AD). Taken together, we show that caspase-8 and caspase-3/7 are involved in regulating microglia activation. We conclude that inhibition of these caspases could be neuroprotective by targeting the microglia rather than the neurons themselves.
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Affiliation(s)
- Miguel A Burguillos
- Department of Oncology-Pathology, Cancer Centrum Karolinska, Karolinska Institutet, 171 76, Stockholm, Sweden
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50
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Pandey RK, Bhatt KH, Dahiya Y, Sodhi A. Mycobacterium indicus pranii supernatant induces apoptotic cell death in mouse peritoneal macrophages in vitro. PLoS One 2011; 6:e17093. [PMID: 21347304 PMCID: PMC3037952 DOI: 10.1371/journal.pone.0017093] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2010] [Accepted: 01/19/2011] [Indexed: 11/19/2022] Open
Abstract
Mycobacterium indicus pranii (MIP), also known as Mw, is a saprophytic, non-pathogenic strain of Mycobacterium and is commercially available as a heat-killed vaccine for leprosy and recently tuberculosis (TB) as part of MDT. In this study we provide evidence that cell-free supernatant collected from original MIP suspension induces rapid and enhanced apoptosis in mouse peritoneal macrophages in vitro. It is demonstrated that the MIP cell-free supernatant induced apoptosis is mitochondria-mediated and caspase independent and involves mitochondrial translocation of Bax and subsequent release of AIF and cytochrome c from the mitochondria. Experiments with pharmacological inhibitors suggest a possible role of PKC in mitochondria-mediated apoptosis of macrophages.
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Affiliation(s)
- Rajeev Kumar Pandey
- School of Biotechnology, Faculty of Science, Banaras Hindu University, Varanasi, India
| | - Kunal H. Bhatt
- School of Biotechnology, Faculty of Science, Banaras Hindu University, Varanasi, India
| | - Yogesh Dahiya
- School of Biotechnology, Faculty of Science, Banaras Hindu University, Varanasi, India
| | - Ajit Sodhi
- School of Biotechnology, Faculty of Science, Banaras Hindu University, Varanasi, India
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