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Garaud S, Roufosse F, De Silva P, Gu-Trantien C, Lodewyckx JN, Duvillier H, Dedeurwaerder S, Bizet M, Defrance M, Fuks F, Bex F, Willard-Gallo K. FOXP1 is a regulator of quiescence in healthy human CD4+T cells and is constitutively repressed in T cells from patients with lymphoproliferative disorders. Eur J Immunol 2016; 47:168-179. [DOI: 10.1002/eji.201646373] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 09/07/2016] [Accepted: 11/03/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Soizic Garaud
- Molecular Immunology Unit; Institut Jules Bordet; Université Libre de Bruxelles; Brussels Belgium
| | - Florence Roufosse
- Department of Internal Medicine; Hôpital Erasme; Université Libre de Bruxelles; Brussels Belgium
- Institute for Medical Immunology; Université Libre de Bruxelles; Gosselies Belgium
| | - Pushpamali De Silva
- Molecular Immunology Unit; Institut Jules Bordet; Université Libre de Bruxelles; Brussels Belgium
| | - Chunyan Gu-Trantien
- Molecular Immunology Unit; Institut Jules Bordet; Université Libre de Bruxelles; Brussels Belgium
| | - Jean-Nicolas Lodewyckx
- Molecular Immunology Unit; Institut Jules Bordet; Université Libre de Bruxelles; Brussels Belgium
| | - Hugues Duvillier
- Flow Cytometry Core Facility; Institut Jules Bordet; Université Libre de Bruxelles; Brussels Belgium
- Molecular Immunology Unit; Institut Jules Bordet; Université Libre de Bruxelles; Brussels Belgium
| | - Sarah Dedeurwaerder
- Laboratory of Cancer Epigenetics; Faculty of Medicine; Université Libre de Bruxelles; Brussels Belgium
| | - Martin Bizet
- Laboratory of Cancer Epigenetics; Faculty of Medicine; Université Libre de Bruxelles; Brussels Belgium
| | - Matthieu Defrance
- Laboratory of Cancer Epigenetics; Faculty of Medicine; Université Libre de Bruxelles; Brussels Belgium
| | - François Fuks
- Laboratory of Cancer Epigenetics; Faculty of Medicine; Université Libre de Bruxelles; Brussels Belgium
| | - Françoise Bex
- Institut de Recherches Microbiologiques J-M Wiame; Université Libre de Bruxelles; Brussels Belgium
| | - Karen Willard-Gallo
- Molecular Immunology Unit; Institut Jules Bordet; Université Libre de Bruxelles; Brussels Belgium
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Deng H, Li F, Li H, Deng Y, Liu J, Wang D, Han G, Wang XJ, Zhang Q. CtBP1 overexpression in keratinocytes perturbs skin homeostasis. J Invest Dermatol 2013; 134:1323-1331. [PMID: 24280726 PMCID: PMC4537778 DOI: 10.1038/jid.2013.504] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 09/24/2013] [Accepted: 10/08/2013] [Indexed: 12/20/2022]
Abstract
Carboxyl-terminal binding protein-1 (CtBP1) is a transcriptional co-repressor with multiple in vitro targets, but its in vivo functions are largely unknown. We generated keratinocyte-specific CtBP1 transgenic mice with a keratin 5 promoter (K5.CtBP1) to probe the pathological roles of CtBP1. At transgene expression levels comparable with endogenous CtBP1 in acute skin wounds, K5.CtBP1 epidermis displayed hyperproliferation, loss of E-cadherin, and failed terminal differentiation. Known CtBP1 target genes associated with these processes, e.g., p21, Brca1, and E-cadherin were down-regulated in K5.CtBP1 skin. Surprisingly, K5.CtBP1 pups also exhibited a hair loss phenotype. We found that expression of the Distal-less 3 (Dlx3), a critical regulator of hair follicle differentiation and cycling, was decreased in K5.CtBP1 mice. Molecular studies revealed that CtBP1 directly suppressed Dlx3 transcription. Consistently, K5.CtBP1 mice displayed abnormal hair follicles with decreased expression of Dlx3 downstream targets Gata3, Hoxc13, and hair keratins. In sum, this first CtBP1 transgenic model provides in vivo evidence for certain CtBP1 functions predicted from in vitro studies, reveals to our knowledge previously unreported functions and transcriptional activities of CtBP1 in the context of epithelial-mesenchymal interplay, and suggest CtBP1 has a pathogenesis role in hair follicle morphogenesis and differentiation.
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Affiliation(s)
- Hui Deng
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado, USA; Department of Pathology, University of Colorado Denver, Aurora, Colorado, USA; Department of Dermatology, The Sixth People's Hospital of Shanghai, Shanghai Jiaotong University, Shanghai, China
| | - Fulun Li
- Department of Pathology, University of Colorado Denver, Aurora, Colorado, USA; Department of Dermatology, Yueyang Hospital Affiliated to Shanghai University of TCM, Shanghai, China
| | - Hong Li
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado, USA
| | - Yu Deng
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado, USA
| | - Jing Liu
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado, USA
| | - Donna Wang
- Department of Pathology, University of Colorado Denver, Aurora, Colorado, USA.
| | - Gangwen Han
- Department of Pathology, University of Colorado Denver, Aurora, Colorado, USA
| | - Xiao-Jing Wang
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado, USA; Department of Pathology, University of Colorado Denver, Aurora, Colorado, USA.
| | - Qinghong Zhang
- Department of Dermatology, University of Colorado Denver, Aurora, Colorado, USA; Department of Pathology, University of Colorado Denver, Aurora, Colorado, USA; Department of Biochemistry and Molecular Genetics, University of Colorado Denver, Aurora, Colorado, USA
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PLEIAD/SIMC1/C5orf25, a novel autolysis regulator for a skeletal-muscle-specific calpain, CAPN3, scaffolds a CAPN3 substrate, CTBP1. J Mol Biol 2013; 425:2955-72. [PMID: 23707407 DOI: 10.1016/j.jmb.2013.05.009] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 04/28/2013] [Accepted: 05/15/2013] [Indexed: 11/20/2022]
Abstract
CAPN3/p94/calpain-3 is a skeletal-muscle-specific member of the calpain protease family. Multiple muscle cell functions have been reported for CAPN3, and mutations in this protease cause limb-girdle muscular dystrophy type 2A. Little is known about the molecular mechanisms that allow CAPN3 to be so multifunctional. One hypothesis is that the very rapid and exhaustive autolytic activity of CAPN3 needs to be suppressed by dynamic molecular interactions for specific periods of time. The previously identified interaction between CAPN3 and connectin/titin, a giant molecule in muscle sarcomeres, supports this assumption; however, the regulatory mechanisms of non-sarcomere-associated CAPN3 are unknown. Here, we report that a novel CAPN3-binding protein, PLEIAD [Platform element for inhibition of autolytic degradation; originally called SIMC1/C5orf25 (SUMO-interacting motif containing protein 1/chromosome 5open reading frame 25)], suppresses the protease activity of CAPN3. Database analyses showed that PLEIAD homologs, like CAPN3 homologs, are evolutionarily conserved in vertebrates. Furthermore, we found that PLEIAD also interacts with CTBP1 (C-terminal binding protein 1), a transcriptional co-regulator, and CTBP1 is proteolyzed in COS7 cells expressing CAPN3. The identified cleavage sites in CTBP1 suggested that it undergoes functional modification upon its proteolysis by CAPN3, as well as by conventional calpains. These results indicate that PLEIAD can shift its major function from CAPN3 suppression to CAPN3-substrate recruitment, depending on the cellular context. Taken together, our data suggest that PLEIAD is a novel regulatory scaffold for CAPN3, as reflected in its name.
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Kitamura N, Mori A, Tatsumi H, Nemoto S, Hiroi T, Kaminuma O. Zinc finger protein, multitype 1, suppresses human Th2 development via downregulation of IL-4. Int Arch Allergy Immunol 2011; 155 Suppl 1:53-6. [PMID: 21646796 DOI: 10.1159/000327292] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Among several GATA family transcription factor-associating proteins, zinc finger protein, multitype 1 (ZFPM1), at least that of murine origin, has been shown to modulate the activity of GATA-3. However, the functional role of human ZFPM1 in the immune system has not been elucidated. Therefore, we here investigated the contribution of ZFPM1 to human Th1/Th2 differentiation. METHODS The cDNA of ZFPM1 was cloned and introduced into human cord blood CD4+ T cells by a lentiviral transduction system. Then, the expression of IL-4 and IFN-γ mRNA was determined by quantitative real-time RT-PCR. The effect of ZFPM1 on the promoter activity of IL-4 and IFN-γ in Jurkat cells was also investigated. RESULTS Stimulation-induced expression of IL-4 and IFN-γ in human CD4+ T cells was suppressed and enhanced, respectively, by the introduction of ZFPM1. The transcriptional activity of IL-4 was also diminished by ZFPM1, whereas that of IFN-γ was not affected. CONCLUSION ZFPM1 that facilitates human Th1 differentiation via the downregulation of IL-4 is a potential target for the treatment of allergic diseases.
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Affiliation(s)
- Noriko Kitamura
- Clinical Research Center for Allergy and Rheumatology, Sagamihara, Japan
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