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Yamamoto T, Tsuge T, Araki M, Maeda M. Cyclic AMP (cAMP)-dependent proteolysis of GATA6 by proteasome: Zinc-finger domain of GATA6 has signals for nuclear export and proteolysis, both of which are responsive to cAMP. Drug Discov Ther 2023; 17:1-9. [PMID: 36740253 DOI: 10.5582/ddt.2022.01107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Transcription factor GATA6 stably expressed in Chinese hamster ovary (CHO)-K1 cells is exported from the nucleus to the cytoplasm and degraded there by proteasome upon treatment with dibutylyl-cyclic AMP (dbcAMP), which is a membrane-permeable cyclic AMP (cAMP) analogue. The cAMP-dependent proteolysis of GATA6 was characterized by dissection of the GATA6 protein into a zinc-finger domain (Zf) and the surrounding region (ΔZf). These segments were separately expressed in CHO-K1 cells stably, and followed by treatment with dbcAMP. The nuclear localized Zf was degraded by proteasome similarly to the full-length GATA6. Site-directed mutants of nuclear localizing signal (NLS) (345RKRKPK350 → AAAAPK and AAAAPA) and closely related GATA4 showed the same behavior. Although nuclear-localized ΔZf was degraded by proteasome, the cytoplasmic-located ΔZf was resistant to proteolysis in contrast to the NLS mutants. We also searched for a potential NLS and nuclear export signal (NES) with computational prediction programs and compared the results with ours. All these results suggest that the amino acid sequence(s) of the Zf of GATA6 is responsive to cAMP-dependent nuclear export and proteolysis.
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Affiliation(s)
- Tomohisa Yamamoto
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan
| | - Takeshi Tsuge
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan
| | | | - Masatomo Maeda
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka, Japan
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Bessonnard S, Coqueran S, Vandormael-Pournin S, Dufour A, Artus J, Cohen-Tannoudji M. ICM conversion to epiblast by FGF/ERK inhibition is limited in time and requires transcription and protein degradation. Sci Rep 2017; 7:12285. [PMID: 28947813 PMCID: PMC5612930 DOI: 10.1038/s41598-017-12120-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 09/04/2017] [Indexed: 01/02/2023] Open
Abstract
Inner cell Mass (ICM) specification into epiblast (Epi) and primitive endoderm (PrE) is an asynchronous and progressive process taking place between E3.0 to E3.75 under the control of the Fibroblast Growth Factor (FGF)/Extracellular signal-Regulated Kinase (ERK) signaling pathway. Here, we have analyzed in details the kinetics of specification and found that ICM cell responsiveness to the up and down regulation of FGF signaling activity are temporally distinct. We also showed that PrE progenitors are generated later than Epi progenitors. We further demonstrated that, during this late phase of specification, a 4 hours period of FGF/ERK inhibition prior E3.75 is sufficient to convert ICM cells into Epi. Finally, we showed that ICM conversion into Epi in response to inhibition during this short time window requires both transcription and proteasome degradation. Collectively, our data give new insights into the timing and mechanisms involved in the process of ICM specification.
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Affiliation(s)
- Sylvain Bessonnard
- Institut Pasteur, CNRS, Unité de Génétique Fonctionnelle de la Souris, UMR 3738, Department of Developmental & Stem Cell Biology, 25 rue du docteur Roux, F-75015, Paris, France
| | - Sabrina Coqueran
- Institut Pasteur, CNRS, Unité de Génétique Fonctionnelle de la Souris, UMR 3738, Department of Developmental & Stem Cell Biology, 25 rue du docteur Roux, F-75015, Paris, France
| | - Sandrine Vandormael-Pournin
- Institut Pasteur, CNRS, Unité de Génétique Fonctionnelle de la Souris, UMR 3738, Department of Developmental & Stem Cell Biology, 25 rue du docteur Roux, F-75015, Paris, France
| | - Alexandre Dufour
- Institut Pasteur, Bioimage Analysis Unit, CNRS UMR 3691, Paris, France.,INSERM UMR935, Paul Brousse Hospital, University Paris Sud, Villejuif, France
| | - Jérôme Artus
- Institut Pasteur, CNRS, Unité de Génétique Fonctionnelle de la Souris, UMR 3738, Department of Developmental & Stem Cell Biology, 25 rue du docteur Roux, F-75015, Paris, France. .,INSERM UMR935, Paul Brousse Hospital, University Paris Sud, Villejuif, France. .,Faculty of Medicine, Kremlin-Bicêtre, University Paris Sud, Paris Saclay, France.
| | - Michel Cohen-Tannoudji
- Institut Pasteur, CNRS, Unité de Génétique Fonctionnelle de la Souris, UMR 3738, Department of Developmental & Stem Cell Biology, 25 rue du docteur Roux, F-75015, Paris, France.
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Ushijima H, Horyozaki A, Maeda M. Anisomycin-induced GATA-6 degradation accompanying a decrease of proliferation of colorectal cancer cell. Biochem Biophys Res Commun 2016; 478:481-485. [PMID: 27404124 DOI: 10.1016/j.bbrc.2016.05.139] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 05/26/2016] [Indexed: 10/21/2022]
Abstract
Transcription factor GATA-6 plays a key role in normal cell differentiation of the mesoderm and endoderm. On the other hand, GATA-6 is abnormally overexpressed in many clinical gastrointestinal cancer tissue samples, and accelerates cell proliferation or an anti-apoptotic response in cancerous tissues. We previously showed that activation of the JNK signaling cascade causes proteolysis of GATA-6. In this study, we demonstrated that anisomycin, a JNK activator, stimulates nuclear export of GATA-6 in a colorectal cancer cell line, DLD-1. Concomitantly, anisomycin remarkably inhibits the proliferation of DLD-1 cells via G2/M arrest in a plate culture. However, it did not induce apoptosis under growth arrest conditions. Furthermore, the growth of DLD-1 cells in a spheroid culture was suppressed by anisomycin. Although 5-FU showed only a slight inhibitory effect on 3D spheroid cultures, the same concentration of 5-FU together with a low concentration of anisomycin exhibited strong growth inhibition. These results suggest that the induction of GATA-6 dysfunction may be more effective for chemotherapy for colorectal cancer, although the mechanism underlying the synergistic effect of 5-FU and anisomycin remains unknown.
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Affiliation(s)
- Hironori Ushijima
- Department of Molecular Biology, School of Pharmacy, Iwate Medical University, 2-1-1, Nishitokuta, Yahaba, Shiwagun, Iwate 028-3694, Japan
| | - Akiko Horyozaki
- Department of Molecular Biology, School of Pharmacy, Iwate Medical University, 2-1-1, Nishitokuta, Yahaba, Shiwagun, Iwate 028-3694, Japan
| | - Masatomo Maeda
- Department of Molecular Biology, School of Pharmacy, Iwate Medical University, 2-1-1, Nishitokuta, Yahaba, Shiwagun, Iwate 028-3694, Japan.
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Li R, Yan G, Zhang Q, Jiang Y, Sun H, Hu Y, Sun J, Xu B. miR-145 inhibits isoproterenol-induced cardiomyocyte hypertrophy by targeting the expression and localization of GATA6. FEBS Lett 2013; 587:1754-61. [PMID: 23624080 PMCID: PMC4183134 DOI: 10.1016/j.febslet.2013.04.018] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Revised: 04/10/2013] [Accepted: 04/11/2013] [Indexed: 01/20/2023]
Abstract
Excessive βAR stimulation is an independent factor in inducing pathological cardiac hypertrophy. Here, we report miR-145 regulates both expression and localization of GATA6, thereby protecting the heart against cardiomyocyte hypertrophy induced by isoproterenol (ISO). The protective activity of miR-145 was associated with down-regulation of ANF, BNP and β-MHC expression, a decreased rate of protein synthesis, inhibited cardiomyocyte growth and the modulation of several signaling pathways including ERK1/2, JNK and Akt-GSK3β. The anti-hypertrophic effect was abrogated by exogenous over-expression of transcription factor GATA6 which was further identified as a direct target of miR-145. In addition, GSK3β antagonists, LiCl and TDZD8, restored the nuclear accumulation of GATA6, which was attenuated by miR-145 Finally, we observed a dynamic pattern of miR-145 expression in ISO-treated NRCMs and in the hearts of TAC mice. Together, our results identify miR-145 as an important regulator in cardiac hypertrophy.
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Affiliation(s)
| | | | - Qun Zhang
- Department of Cardiology, The Affiliated Drum Tower Hospital of Nanjing, University Medical School, Nanjing, People’s Republic of China; Center for Translational Medicine (J. S.), Thomas Jefferson University, Philadelphia, PA
| | - Yue Jiang
- Department of Cardiology, The Affiliated Drum Tower Hospital of Nanjing, University Medical School, Nanjing, People’s Republic of China; Center for Translational Medicine (J. S.), Thomas Jefferson University, Philadelphia, PA
| | - Haixiang Sun
- Department of Cardiology, The Affiliated Drum Tower Hospital of Nanjing, University Medical School, Nanjing, People’s Republic of China; Center for Translational Medicine (J. S.), Thomas Jefferson University, Philadelphia, PA
| | - Yali Hu
- Department of Cardiology, The Affiliated Drum Tower Hospital of Nanjing, University Medical School, Nanjing, People’s Republic of China; Center for Translational Medicine (J. S.), Thomas Jefferson University, Philadelphia, PA
| | - Jianxin Sun
- Department of Cardiology, The Affiliated Drum Tower Hospital of Nanjing, University Medical School, Nanjing, People’s Republic of China; Center for Translational Medicine (J. S.), Thomas Jefferson University, Philadelphia, PA
| | - Biao Xu
- Department of Cardiology, The Affiliated Drum Tower Hospital of Nanjing, University Medical School, Nanjing, People’s Republic of China; Center for Translational Medicine (J. S.), Thomas Jefferson University, Philadelphia, PA
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Juurlink BHJ. Dietary Nrf2 activators inhibit atherogenic processes. Atherosclerosis 2012; 225:29-33. [PMID: 22986182 DOI: 10.1016/j.atherosclerosis.2012.08.032] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 08/23/2012] [Accepted: 08/25/2012] [Indexed: 12/21/2022]
Abstract
Dietary Nrf2 activators increase expression of phase 2 protein genes in cells undergoing oxidative stress resulting in a lowering of oxidative stress. Oxidative stress promotes atherogenic processes through oxidizing low density lipoproteins and promotion of inflammation through activation of nuclear factor kappa B and activation of mitogen-activated protein kinases. Nrf2 activators by decreasing oxidative stress decrease the probability of developing atherosclerotic lesions.
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Affiliation(s)
- Bernhard H J Juurlink
- College of Medicine, University of Saskatchewan, SK, Canada; College of Medicine, Alfaisal University, Riyadh, Saudi Arabia.
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Ushijima H, Maeda M. cAMP-dependent proteolysis of GATA-6 is linked to JNK-signaling pathway. Biochem Biophys Res Commun 2012; 423:679-83. [PMID: 22695114 DOI: 10.1016/j.bbrc.2012.06.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 06/02/2012] [Indexed: 10/28/2022]
Abstract
A JNK inhibitor SP600125 inhibited cAMP-dependent proteolysis of GATA-6 by proteasomes around its IC50. We further examined the effects of SP600125 on the degradation of GATA-6 in detail, since an activator of JNK (anisomycin) is available. Interestingly, anisomycin immediately stimulated the export of nuclear GATA-6 into the cytoplasm, and then the cytoplasmic content of GATA-6 decreased slowly through degradation by proteasomes. Such an effect of anisomycin was inhibited by SP600125, indicating that the observed phenomenon might be linked to the JNK signaling pathway. The inhibitory effect of SP600125 could not be ascribed to the inhibition of PKA, since phosphorylation of CREB occurred in the presence of dbcAMP and SP600125. The nuclear export of GATA-6 was inhibited by leptomycin B, suggesting that CRM1-mediated export could be activated by anisomycin. Furthermore, it seems likely that the JNK activated by anisomycin may stimulate not only the nuclear export of GATA-6 through CRM1 but also the degradation of GATA-6 by cytoplasmic proteasomes. In contrast, A-kinase might activate only the latter process through JNK.
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Affiliation(s)
- Hironori Ushijima
- Department of Molecular Biology, School of Pharmacy, Iwate Medical University, 2-1-1, Nishitokuta, Yahaba, Shiwagun, Iwate 028-3694, Japan
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Ushijima H, Maeda M. Inhibitors of protein kinases affecting cAMP-dependent proteolysis of GATA-6. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/abc.2012.24051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Chen YE, Yuan S, Du JB, Xu MY, Zhang ZW, Lin HH. Phosphorylation of photosynthetic antenna protein CP29 and photosystem II structure changes in monocotyledonous plants under environmental stresses. Biochemistry 2009; 48:9757-63. [PMID: 19764773 DOI: 10.1021/bi901308x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Kinetic studies of protein dephosphorylation in thylakoid membranes showed that the minor light-harvesting antenna protein CP29 could be phosphorylated in barley (C3) and maize (C4) seedlings, but not in spinach under water [Liu, W. J., et al. (2009) Biochim. Biophys. Acta 1787, 1238-1245], salt, or cold stress [Pursiheimo, S., et al. (2003) Plant Cell Environ. 26, 1995-2003], suggesting that phosphorylation of CP29 is a general phenomenon in monocots, but not in dicots under environmental stresses. Abscisic acid (ABA), reactive oxygen species (ROS), salicylic acid (SA), jasmonic acid (JA), ethylene (ET), NO, and the scavenger of H(2)O(2) had weak effects on CP29 phosphorylation. However, three protein kinase inhibitors, U0126, W7, and K252a (for mitogen-activated protein kinase, Ca(2+)-dependent protein kinase, and Ser/Thr protein kinases, respectively), decrease the level of CP29 phosphorylation in barley apparently under environmental stresses. Therefore, these three protein kinases are involved in CP29 phosphorylation. We also found that most CP29 phosphorylation was accompanied by its lateral migration from granum membranes to stroma-exposed thylakoid regions, and the instability of PSII supercomplexes and LHCII trimers under environmental stresses.
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Affiliation(s)
- Yang-Er Chen
- Ministry of Education Key Laboratory for Bio-Resource and Eco-Environment, College of Life Science, Sichuan University, Chengdu 610064, China
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Taniguchi H, Komiyama J, Viger RS, Okuda K. The expression of the nuclear receptors NR5A1 and NR5A2 and transcription factor GATA6 correlates with steroidogenic gene expression in the bovine corpus luteum. Mol Reprod Dev 2009; 76:873-80. [PMID: 19455657 DOI: 10.1002/mrd.21054] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The corpus luteum (CL) is the major site of progesterone (P4) production during the luteal phase of the estrous cycle in cattle. To better understand the molecular mechanisms underlying P4 production, we compared the mRNA and protein expression profiles of key components of the steroidogenic pathway (StAR, CYP11A, and 3beta-HSD) during the bovine CL luteal phase with that of several transcription factors (NR5A1, NR5A2, GATA4, GATA6) known for their roles in the control of steroidogenic gene expression. In the bovine CL, StAR, CYP11A, and 3beta-HSD mRNA and protein levels remained constant at the mid and late luteal phases but markedly declined at the regressed luteal stage. NR5A1 and NR5A2 exhibited a similar pattern with a significant decrease in expression at the regressed luteal stage. Both GATA4 and GATA6 mRNA and proteins could be detected in bovine CL; GATA6 levels, however, were generally higher. Although GATA4 expression did not change during the luteal phase, GATA6 showed a marked decrease at the regressed luteal stage, like NR5A1, NR5A2, and the other steroidogenic markers. Thus, we suggest that NR5A1, NR5A2, and GATA6, but not GATA4, contribute to the transcriptional regulation of steroidogenic gene expression, and hence P4 production, in the bovine CL. Furthermore, we have demonstrated the association of NR5A1 and NR5A2 with the bovine StAR promoter in the mid-luteal CL using chromatin immunoprecipitation, suggesting that these factors have definitive roles in the regulation of StAR gene transcription in vivo.
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Affiliation(s)
- Hiroaki Taniguchi
- Department of Obstetrics and Gynecology, Centre de Recherche en Biologie de la Reproduction (CRBR), Laval University, Quebec City, Quebec, Canada
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Kanematsu A, Ramachandran A, Adam RM. GATA-6 mediates human bladder smooth muscle differentiation: involvement of a novel enhancer element in regulating alpha-smooth muscle actin gene expression. Am J Physiol Cell Physiol 2007; 293:C1093-102. [PMID: 17626241 DOI: 10.1152/ajpcell.00225.2007] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hollow organs exposed to pathological stimuli undergo phenotypic modulation characterized by altered expression of smooth muscle contractile proteins and loss of normal function. The molecular mechanisms that regulate smooth muscle differentiation, especially in organs other than the vasculature, are poorly understood. In this study, we describe a role for the GATA-6 transcription factor in regulation of human bladder smooth muscle differentiation. Knockdown of endogenous GATA-6 in primary human bladder smooth muscle cells (pBSMC) led to decreased mRNA levels of the differentiation markers alpha-smooth muscle actin (alpha-SMA), calponin, and smooth muscle myosin heavy chain. Similar effects were obtained following downregulation of GATA-6 by forskolin-induced elevation of intracellular cAMP levels. Forskolin treatment of pBSMC abolished recruitment of GATA-6 to the alpha-SMA promoter in vivo and reduced activity of human alpha-SMA promoter-directed gene expression by >60%. This inhibitory effect was rescued by enforced expression of wild-type GATA-6 but not by a zinc-finger-deleted mutant, GATA-6-DeltaZF, which lacks DNA-binding ability. In silico analysis of a region of the human alpha-SMA promoter, described previously as a transcriptional enhancer, identified a putative GATA-binding site at position -919/-913. Point mutation of this site in SMA-Luc abrogated GATA-6-induced activation of promoter activity. Together, these results provide the first evidence for a functional role for GATA-6 in regulation of bladder smooth muscle differentiation. In addition, these findings demonstrate that GATA-6 regulates human alpha-SMA expression via a novel regulatory cis element in the alpha-SMA promoter-enhancer.
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Affiliation(s)
- Akihiro Kanematsu
- Urological Diseases Research Center, John F. Enders Research Laboratories, Rm. 1077, 300 Longwood Ave., Boston, MA 02115, USA.
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Bour G, Taneja R, Rochette‐Egly C. Mouse embryocarcinoma F9 cells and retinoic acid: A model to study the molecular mechanisms of endodermal differentiation. NUCLEAR RECEPTORS IN DEVELOPMENT 2006. [DOI: 10.1016/s1574-3349(06)16007-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Abstract
Mammalian GATA-6, which has conserved tandem zinc fingers (CVNC-X(17)-CNAC)-X(29)-(CXNC-X(17)-CNAC), is essential for the development and specific gene regulation of the heart, gastrointestinal tract and other tissues. GATA-6 recognizes the (A/T/C)GAT(A/T)(A) sequence, and interacts with other transcriptional regulators through its zinc-finger region. The mRNA of GATA-6 uses two Met codons in frame as translational initiation codons, and produces L- and S-type GATA-6 through leaky ribosome scanning. GATA-6 is subjected to cAMP-dependent proteolysis by a proteasome in a heterologous expression system. These protein-based characteristics of GATA-6 will be helpful for the identification of target genes, together with determination of the in vivo binding sites for GATA-6 and understanding of the complex network of gene regulation mediated by GATA-6.
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Affiliation(s)
- Masatomo Maeda
- Laboratory of Biochemistry and Molecular Biology, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan.
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