1
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Baum O. Expression of neuronal NO synthase α- and β-isoforms in skeletal muscle of mice. Biochem J 2024; 481:601-613. [PMID: 38592741 DOI: 10.1042/bcj20230458] [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: 11/02/2023] [Revised: 03/27/2024] [Accepted: 04/09/2024] [Indexed: 04/10/2024]
Abstract
Knowledge of the primary structure of neuronal NO synthase (nNOS) in skeletal muscle is still conflicting and needs further clarification. To elucidate the expression patterns of nNOS isoforms at both mRNA and protein level, systematic reverse transcription (RT)-PCR and epitope mapping by qualitative immunoblot analysis on skeletal muscle of C57/BL6 mice were performed. The ability of the nNOS isoforms to form aggregates was characterized by native low-temperature polyacrylamide electrophoresis (LT-PAGE). The molecular analysis was focused on the rectus femoris (RF) muscle, a skeletal muscle with a nearly balanced ratio of nNOS α- and β-isoforms. RT-PCR amplificates from RF muscles showed exclusive exon-1d mRNA expression, either with or without exon-μ. Epitope mapping demonstrated the simultaneous expression of the nNOS splice variants α/μ, α/non-μ, β/μ and β/non-μ. Furthermore, immunoblotting suggests that the transition between nNOS α- and β-isoforms lies within exon-3. In LT-PAGE, three protein nNOS associated aggregates were detected in homogenates of RF muscle and tibialis anterior muscle: a 320 kDa band containing nNOS α-isoforms, while 250 and 300 kDa bands consist of nNOS β-isoforms that form homodimers or heterodimers with non-nNOS proteins.
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Affiliation(s)
- Oliver Baum
- Institute of Physiology, Charité - Universitätsmedizin Berlin, Charitéplatz 1, D-10117 Berlin, Germany
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2
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Locascio A, Vassalli QA, Castellano I, Palumbo A. Novel Insights on Nitric Oxide Synthase and NO Signaling in Ascidian Metamorphosis. Int J Mol Sci 2022; 23:ijms23073505. [PMID: 35408864 PMCID: PMC8999111 DOI: 10.3390/ijms23073505] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 03/11/2022] [Accepted: 03/20/2022] [Indexed: 02/05/2023] Open
Abstract
Nitric oxide (NO) is a pivotal signaling molecule involved in a wide range of physiological and pathological processes. We investigated NOS/NO localization patterns during the different stages of larval development in the ascidia Ciona robusta and evidenced a specific and temporally controlled pattern. NOS/NO expression starts in the most anterior sensory structures of the early larva and progressively moves towards the caudal portion as larval development and metamorphosis proceeds. We here highlight the pattern of NOS/NO expression in the central and peripheral nervous system of Ciona larvae which precisely follows the progression of neural signals of the central pattern generator necessary for the control of the movements of the larva towards the substrate. This highly dynamic localization profile perfectly matches with the central role played by NO from the first phase of settlement induction to the next control of swimming behavior, adhesion to substrate and progressive tissue resorption and reorganization of metamorphosis itself.
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Affiliation(s)
- Annamaria Locascio
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy;
- Correspondence: (A.L.); (A.P.)
| | - Quirino Attilio Vassalli
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy;
| | - Immacolata Castellano
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy;
- Department of Molecular Medicine and Medical Biotechnology, University of Naples Federico II, Via Pansini 5, 80131 Napoli, Italy;
| | - Anna Palumbo
- Department of Biology and Evolution of Marine Organisms, Stazione Zoologica Anton Dohrn, Villa Comunale, 80121 Napoli, Italy;
- Correspondence: (A.L.); (A.P.)
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3
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Rathore SK, Pati P, Priyadarshini S, Dwibedi B. Association of G84A and C276T polymorphism in neuronal nitric oxide synthase (nNOS) gene with herpes simplex encephalitis in eastern Indian population. Nitric Oxide 2020; 108:8-11. [PMID: 33347982 DOI: 10.1016/j.niox.2020.12.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 09/22/2020] [Accepted: 12/16/2020] [Indexed: 10/22/2022]
Abstract
In this study, a hypothesis that genetic variations in neuronal nitric oxide synthase (nNOS) could influence the susceptibility and outcome of herpes simplex encephalitis was investigated. Polymorphic loci of nNOS gene, G84A and C276T were genotyped in 132 HSE cases (Age 8.2 ± 1.3yr) and 143 in healthy individuals (Age-9.2 ± 1.6yr) of the same ethnic background from Odisha. A significantly increased risk for HSVE was associated with the AG genotype (OR = 1.73, 95%CI = 1.03-2.9, P = 0.03) and AA genotype (OR = 2.96, 95%CI = 1.04-8.4, P = 0.04) of nNOS 84G →A locus. In case of nNOS 276C→T variation, HSVE risk was linked to CT genotype (OR = 1.79, 95%CI = 1.07-3.0, P = 0.03) and TT genotype (OR = 3.6, 95%CI = 1.2-10.8, P = 0.02). Patients with poor outcome either had homo or heterozygous genotype for both SNPs, but separate genotype analysis could not show significance. But combined genotype analysis of both SNPs confirmed that GG + CC was a risk factor for development of poor outcome. (OR = 6.3, CI-1.9-20.7, P = 0.0033). Haplotype analysis of both SNP did show that "at" haplotype was significantly higher and associated with HSVE cases (OR = 2.322,CI: 1.43-3.77, P = 0.00070). The result observed in this study suggested that variation at these loci of nNOS may have decreased its expression and caused low production of NO, which have resulted in risk of HSVE but provided good outcome in these patients.
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Affiliation(s)
- S K Rathore
- ICMR-Regional Medical Research Centre, Bhubneswar, India; School of Biotechnology, KIIT University, Bhubaneswar, India
| | - P Pati
- ICMR-Regional Medical Research Centre, Bhubneswar, India; School of Biotechnology, KIIT University, Bhubaneswar, India
| | | | - B Dwibedi
- ICMR-Regional Medical Research Centre, Bhubneswar, India; Dept of Pediatrics, AIIMS, Bhubaneswar, India.
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4
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Huning L, Kunkel GR. The ubiquitous transcriptional protein ZNF143 activates a diversity of genes while assisting to organize chromatin structure. Gene 2020; 769:145205. [PMID: 33031894 DOI: 10.1016/j.gene.2020.145205] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 09/24/2020] [Accepted: 09/29/2020] [Indexed: 10/23/2022]
Abstract
Zinc Finger Protein 143 (ZNF143) is a pervasive C2H2 zinc-finger transcriptional activator protein regulating the efficiency of eukaryotic promoter regions. ZNF143 is able to activate transcription at both protein coding genes and small RNA genes transcribed by either RNA polymerase II or RNA polymerase III. Target genes regulated by ZNF143 are involved in an array of different cellular processes including both cancer and development. Although a key player in regulating eukaryotic genes, the molecular mechanism by with ZNF143 binds and activates genes transcribed by two different polymerases is still relatively unknown. In addition to its role as a transcriptional regulator, recent genomics experiments have implicated ZNF143 as a potential co-factor involved in chromatin looping and establishing higher order structure within the genome. This review focuses primarily on possible activation mechanisms of promoters by ZNF143, with less emphasis on the role of ZNF143 in cancer and development, and its function in establishing higher order chromatin contacts within the genome.
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Affiliation(s)
- Laura Huning
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-2128, USA
| | - Gary R Kunkel
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-2128, USA.
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5
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Ye B, Yang G, Li Y, Zhang C, Wang Q, Yu G. ZNF143 in Chromatin Looping and Gene Regulation. Front Genet 2020; 11:338. [PMID: 32318100 PMCID: PMC7154149 DOI: 10.3389/fgene.2020.00338] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 03/20/2020] [Indexed: 01/02/2023] Open
Abstract
ZNF143, a human homolog of the transcriptional activator Staf, is a C2H2-type protein consisting of seven zinc finger domains. As a transcription factor (TF), ZNF143 is sequence specifically binding to chromatin and activates the expression of protein-coding and non-coding genes on a genome scale. Although it is ubiquitous expressed, its expression in cancer cells and tissues is usually higher than that in normal cells and tissues. Therefore, abnormal expression of ZNF143 is related to cancer cell survival, proliferation, differentiation, migration, and invasion, suggesting that new small molecules can be designed by targeting ZNF143 as it may be a good potential biomarker and therapeutic target for related cancers. However, the mechanism on how ZNF143 regulates its targeting gene remains unclear. Recently, with the development of chromatin conformation capture (3C) and its derivatives, and high-throughput sequencing technology, new findings have been obtained in the study of ZNF143. Pioneering studies have showed that ZNF143 binds directly to promoters and contributes to chromatin interactions connecting promoters to distal regulatory elements, such as enhancers. Further, it has proved that ZNF143 is involved in CCCTC-binding factor (CTCF) in establishing the conserved chromatin loops by cooperating with cohesin and other partners. These results indicate that ZNF143 is a key loop formation factor. In addition, we report ZNF143 is dynamically bound to chromatin during the cell cycle demonstrated that it is a potential mitotic bookmarking factor. It may be associated with CTCF for mitosis-to-G1 phase transition and chromatin loop re-establishment in early G1 phase. In the future, researchers could further clarify the fine mechanism of ZNF143 in mediating chromatin loops with the help of CUT&RUN (CUT&Tag) and Cut-C technology. Thus, in this review, we summarize the research progress of TF ZNF143 in detail and also predict the potential functions of ZNF143 in cell fate and identity based on our recent discoveries.
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Affiliation(s)
- Bingyu Ye
- State Key Laboratory of Cell Differentiation and Regulation, Henan Normal University, Xinxiang, China.,Henan International Joint Laboratory of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,Henan Center for Outstanding Overseas Scientists of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,College of Life Sciences, Henan Normal University, Xinxiang, China.,Institute of Biomedical Science, Henan Normal University, Xinxiang, China.,Overseas Expertise Introduction Center for Discipline Innovation of Pulmonary Fibrosis (111 Project), Henan Normal University, Xinxiang, China
| | - Ganggang Yang
- State Key Laboratory of Cell Differentiation and Regulation, Henan Normal University, Xinxiang, China.,Henan International Joint Laboratory of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,Henan Center for Outstanding Overseas Scientists of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,College of Life Sciences, Henan Normal University, Xinxiang, China.,Institute of Biomedical Science, Henan Normal University, Xinxiang, China.,Overseas Expertise Introduction Center for Discipline Innovation of Pulmonary Fibrosis (111 Project), Henan Normal University, Xinxiang, China
| | - Yuanmeng Li
- College of Life Sciences, Henan Normal University, Xinxiang, China
| | - Chunyan Zhang
- State Key Laboratory of Cell Differentiation and Regulation, Henan Normal University, Xinxiang, China.,Henan International Joint Laboratory of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,Henan Center for Outstanding Overseas Scientists of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,College of Life Sciences, Henan Normal University, Xinxiang, China.,Institute of Biomedical Science, Henan Normal University, Xinxiang, China.,Overseas Expertise Introduction Center for Discipline Innovation of Pulmonary Fibrosis (111 Project), Henan Normal University, Xinxiang, China
| | - Qiwen Wang
- State Key Laboratory of Cell Differentiation and Regulation, Henan Normal University, Xinxiang, China.,Henan International Joint Laboratory of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,Henan Center for Outstanding Overseas Scientists of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,College of Life Sciences, Henan Normal University, Xinxiang, China.,Institute of Biomedical Science, Henan Normal University, Xinxiang, China.,Overseas Expertise Introduction Center for Discipline Innovation of Pulmonary Fibrosis (111 Project), Henan Normal University, Xinxiang, China
| | - Guoying Yu
- State Key Laboratory of Cell Differentiation and Regulation, Henan Normal University, Xinxiang, China.,Henan International Joint Laboratory of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,Henan Center for Outstanding Overseas Scientists of Pulmonary Fibrosis, Henan Normal University, Xinxiang, China.,College of Life Sciences, Henan Normal University, Xinxiang, China.,Institute of Biomedical Science, Henan Normal University, Xinxiang, China.,Overseas Expertise Introduction Center for Discipline Innovation of Pulmonary Fibrosis (111 Project), Henan Normal University, Xinxiang, China
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6
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Roth NJ, Zipperich S, Kopf J, Deckert J, Reif A. Influence of two functional polymorphisms in NOS1 on baseline cortisol and working memory in healthy subjects. Nitric Oxide 2019; 88:45-49. [PMID: 31002875 DOI: 10.1016/j.niox.2019.04.003] [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: 02/03/2019] [Revised: 04/02/2019] [Accepted: 04/09/2019] [Indexed: 10/27/2022]
Abstract
INTRODUCTION The neuronal isoform of the nitric oxide synthase (NOS-I) encoded by NOS1 is the main source of nitric oxide (NO) in the brain. Reduced NO signaling in the prefrontal cortex has been linked to schizophrenia and cognitive processes while reduced striatal NOS1 expression has been associated with impulsive behavior. METHODS To evaluate the effect of two functional polymorphisms in alternative first exons of NOS1, ex1f-VNTR and ex1c-SNP rs41279104, on the HPA stress axis and neurocognitive abilities, 280 healthy subjects were genotyped, had their salivary cortisol levels measured and were assessed in verbal memory, verbal fluency, working memory and verbal IQ by using the California Verbal Learning Test (CVLT), the Regensburger test of verbal fluency (RWT), a n-back task and subscales of the Wechsler Adult Intelligence Scale III (WAIS-III). RESULTS Schizophrenia risk (A)-allele carriers of NOS1 ex1c-SNP rs41279104 displayed significantly lower baseline cortisol levels (p = 0.004). NOS1 ex1f-VNTR genotype carriers showed differences in working memory performance (p = 0.05) in a gene-dose effect manner, with homozygous carriers of the short impulsivity-risk allele committing most commission errors. Finally, A-allele carriers of the NOS1 ex1c-SNP rs41279104 tended to react faster during the working memory task (p = 0.065). CONCLUSION For the first time, we demonstrated an influence of the NOS1 ex1c-SNP rs41279104 on salivary cortisol levels and additionally implicate the A-allele in an enhanced reaction time during a working memory task. Regarding the NOS1 ex1f-VNTR our study supports the previously reported influence on impulsivity, lending further support to the hypothesis that this genetic variant underlies impulsive behavior.
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Affiliation(s)
- N J Roth
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Wuerzburg, Wuerzburg, Germany.
| | - S Zipperich
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Frankfurt, Frankfurt am Main, Germany
| | - J Kopf
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Frankfurt, Frankfurt am Main, Germany
| | - J Deckert
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Wuerzburg, Wuerzburg, Germany
| | - A Reif
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital Frankfurt, Frankfurt am Main, Germany
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7
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Hou L, Li B, Ding D, Kang L, Wang X. CREB-B acts as a key mediator of NPF/NO pathway involved in phase-related locomotor plasticity in locusts. PLoS Genet 2019; 15:e1008176. [PMID: 31150381 PMCID: PMC6561586 DOI: 10.1371/journal.pgen.1008176] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 06/12/2019] [Accepted: 05/07/2019] [Indexed: 12/14/2022] Open
Abstract
Gene expression changes in neural systems are essential for environment-induced behavioral plasticity in animals; however, neuronal signaling pathways mediating the effect of external stimuli on transcriptional changes are largely unknown. Recently, we have demonstrated that the neuropeptide F (NPF)/nitric oxide (NO) signaling pathway plays a regulatory role in phase-related locomotor plasticity in the migratory locust, Locusta migratoria. Here, we report that a conserved transcription factor, cAMP response element-binding protein B (CREB-B), is a key mediator involved in the signaling pathway from NPF2 to NOS in the migratory locust, triggering locomotor activity shift between solitarious and gregarious phases. We find that CREB-B directly activates brain NOS expression by interacting with NOS promoter region. The phosphorylation at serine 110 site of CREB-B dynamically changes in response to population density variation and is negatively controlled by NPF2. The involvement of CREB-B in NPF2-regulated locomotor plasticity is further validated by RNAi experiment and behavioral assay. Furthermore, we reveal that protein kinase A mediates the regulatory effects of NPF2 on CREB-B phosphorylation and NOS transcription. These findings highlight a precise signal cascade underlying environment-induced behavioral plasticity.
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Affiliation(s)
- Li Hou
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Beibei Li
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Ding Ding
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Le Kang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China
| | - Xianhui Wang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
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8
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Mosińska P, Jacenik D, Sałaga M, Wasilewski A, Cygankiewicz A, Sibaev A, Mokrowiecka A, Małecka-Panas E, Pintelon I, Storr M, Timmermans JP, Krajewska WM, Fichna J. FABP4 blocker attenuates colonic hypomotility and modulates white adipose tissue-derived hormone levels in mouse models mimicking constipation-predominant IBS. Neurogastroenterol Motil 2018; 30:e13272. [PMID: 29266569 DOI: 10.1111/nmo.13272] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 11/28/2017] [Indexed: 02/08/2023]
Abstract
BACKGROUND The role of fatty acid binding protein 4 (FABP4) in lower gastrointestinal (GI) motility is unknown. We aimed to verify the effect of inhibition of FABP4 on GI transit in vivo, and to determine the expression of FABP4 in mouse and human tissues. METHODS Fatty acid binding protein 4 inhibitor, BMS309403, was administered acutely or chronically for 6 and 13 consecutive days and its effect on GI transit was assessed in physiological conditions and in loperamide-induced constipation. Intracellular recordings were made to examine the effects of BMS309403 on colonic excitatory and inhibitory junction potentials. Abdominal pain was evaluated using behavioral pain response. Localization and expression of selected adipokines were determined in the mouse colon and serum using immunohistochemistry and Enzyme-Linked ImmunoSorbent Assay respectively. mRNA expression of FABP4 and selected adipokines in colonic and serum samples from irritable bowel syndrome (IBS) patients and control group were assessed. KEY RESULTS Acute injection of BMS309403 significantly increased GI motility and reversed inhibitory effect of loperamide. BMS309403 did not change colonic membrane potentials. Chronic treatment with BMS309403 increased the number of pain-induced behaviors. In the mouse serum, level of resistin was significantly decreased after acute administration; no changes in adiponectin level were detected. In the human serum, level of adiponectin and resistin, but not of FABP4, were significantly elevated in patients with constipation-IBS (IBS-C). FABP4 mRNA expression was significantly downregulated in the human colon in IBS-C. CONCLUSIONS AND INFERENCES Fatty acid binding protein 4 may be involved in IBS pathogenesis and become a novel target in the treatment of constipation-related diseases.
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Affiliation(s)
- P Mosińska
- Department of Biochemistry, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
| | - D Jacenik
- Department of Cytobiochemistry, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - M Sałaga
- Department of Biochemistry, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
| | - A Wasilewski
- Department of Biochemistry, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
| | - A Cygankiewicz
- Department of Cytobiochemistry, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - A Sibaev
- Walter Brendel Center of Experimental Medicine, Ludwig Maximilians University of Munich, Munich, Germany
| | - A Mokrowiecka
- Department of Digestive Tract Disease, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
| | - E Małecka-Panas
- Department of Digestive Tract Disease, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
| | - I Pintelon
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - M Storr
- Walter Brendel Center of Experimental Medicine, Ludwig Maximilians University of Munich, Munich, Germany.,Center of Endoscopy, Stanberg, Germany
| | - J P Timmermans
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - W M Krajewska
- Department of Cytobiochemistry, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - J Fichna
- Department of Biochemistry, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
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9
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Freudenberg F, Alttoa A, Reif A. Neuronal nitric oxide synthase (NOS1) and its adaptor, NOS1AP, as a genetic risk factors for psychiatric disorders. GENES BRAIN AND BEHAVIOR 2015; 14:46-63. [PMID: 25612209 DOI: 10.1111/gbb.12193] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 11/17/2014] [Accepted: 12/03/2014] [Indexed: 12/15/2022]
Abstract
Nitric oxide (NO) is a gaseous transmitter produced by nitric oxide synthases (NOSs). The neuronal isoform (NOS-I, encoded by NOS1) is the main source of NO in the central nervous system (CNS). Animal studies suggest that nitrinergic dysregulation may lead to behavioral abnormalities. Unfortunately, the large number of animal studies is not adequately reflected by publications concerning humans. These include post-mortem studies, determination of biomarkers, and genetic association studies. Here, we review the evidence for the role of NO in psychiatric disorders by focusing on the human NOS1 gene as well as biomarker studies. Owing to the complex regulation of NOS1 and the varying function of NOS-I in different brain regions, no simple, unidirectional association is expected. Rather, the 'where, when and how much' of NO formation is decisive. Present data, although still preliminary and partially conflicting, suggest that genetically driven reduced NO signaling in the prefrontal cortex is associated with schizophrenia and cognition. Both NOS1 and its interaction partner NOS1AP have a role therein. Also, reduced NOS1 expression in the striatum determined by a length polymorphism in a NOS1 promoter (NOS1 ex1f-VNTR) goes along with a variety of impulsive behaviors. An association of NOS1 with mood disorders, suggested by animal models, is less clear on the genetic level; however, NO metabolites in blood may serve as biomarkers for major depression and bipolar disorder. As the nitrinergic system comprises a relevant target for pharmacological interventions, further studies are warranted not only to elucidate the pathophysiology of mental disorders, but also to evaluate NO function as a biomarker.
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Affiliation(s)
- F Freudenberg
- Department of Psychiatry, Psychosomatics and Psychotherapy, University Hospital of Frankfurt, Frankfurt am Main, Germany
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10
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Fichna J, Poole DP, Veldhuis N, MacEachern SJ, Saur D, Zakrzewski PK, Cygankiewicz AI, Mokrowiecka A, Małecka-Panas E, Krajewska WM, Liedtke W, Steinhoff MS, Timmermans JP, Bunnett NW, Sharkey KA, Storr MA. Transient receptor potential vanilloid 4 inhibits mouse colonic motility by activating NO-dependent enteric neurotransmission. J Mol Med (Berl) 2015; 93:1297-309. [PMID: 26330151 DOI: 10.1007/s00109-015-1336-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 07/12/2015] [Accepted: 08/17/2015] [Indexed: 01/15/2023]
Abstract
UNLABELLED Recent studies implicate TRPV4 receptors in visceral pain signaling and intestinal inflammation. Our aim was to evaluate the role of TRPV4 in the control of gastrointestinal (GI) motility and to establish the underlying mechanisms. We used immunohistochemistry and PCR to study TRPV4 expression in the GI tract. The effect of TRPV4 activation on GI motility was characterized using in vitro and in vivo motility assays. Calcium and nitric oxide (NO) imaging were performed to study the intracellular signaling pathways. Finally, TRPV4 expression was examined in the colon of healthy human subjects. We demonstrated that TRPV4 can be found on myenteric neurons of the colon and is co-localized with NO synthase (NOS-1). In vitro, the TRPV4 agonist GSK1016790A reduced colonic contractility and increased inhibitory neurotransmission. In vivo, TRPV4 activation slowed GI motility and reduced stool production in mouse models mimicking pathophysiological conditions. We also showed that TRPV4 activation inhibited GI motility by reducing NO-dependent Ca(2+) release from enteric neurons. In conclusion, TRPV4 is involved in the regulation of GI motility in health and disease. KEY MESSAGES • Recent studies implicate TRPV4 in pain signaling and intestinal inflammation. • Our aim was to characterize the role of TRPV4 in the control of GI motility. • We found that TRPV4 activation reduced colonic contractility. • Our studies also showed altered TRPV4 mRNA expression in IBS-C patients. • TRPV4 may be a novel pharmacological target in functional GI diseases.
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Affiliation(s)
- J Fichna
- Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Department of Medicine, Division of Gastroenterology, University of Calgary, Calgary, AB, Canada.,Department of Biochemistry, Medical University of Lodz, Lodz, Poland
| | - D P Poole
- Monash Institute of Pharmaceutical Sciences, Parkville, Victoria, Australia.,Department of Anatomy and Neuroscience, The University of Melbourne, Parkville, VIC, Australia
| | - N Veldhuis
- Monash Institute of Pharmaceutical Sciences, Parkville, Victoria, Australia
| | - S J MacEachern
- Department of Physiology & Pharmacology, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - D Saur
- II Medizinische Klinik, Technische Universität München, Munich, Germany
| | - P K Zakrzewski
- Department of Cytobiochemistry, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - A I Cygankiewicz
- Department of Cytobiochemistry, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - A Mokrowiecka
- Department of Digestive Tract Diseases, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
| | - E Małecka-Panas
- Department of Digestive Tract Diseases, Faculty of Medicine, Medical University of Lodz, Lodz, Poland
| | - W M Krajewska
- Department of Cytobiochemistry, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - W Liedtke
- Center for Translational Neuroscience, Duke University, Durham, NC, USA
| | - M S Steinhoff
- Department of Dermatology and Surgery, University of California San Francisco, San Francisco, CA, USA
| | - J-P Timmermans
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences, University of Antwerp, Antwerp, Belgium
| | - N W Bunnett
- Monash Institute of Pharmaceutical Sciences, Parkville, Victoria, Australia.,Department of Pharmacology, The University of Melbourne, Parkville, VIC, Australia
| | - K A Sharkey
- Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada.,Department of Physiology & Pharmacology, University of Calgary, Calgary, AB, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada
| | - M A Storr
- Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB, Canada. .,Department of Medicine, Division of Gastroenterology, University of Calgary, Calgary, AB, Canada. .,Department of Medicine, Division of Gastroenterology, Ludwig Maximilians University of Munich, Marchioninistrasse 15, 81377, Munich, Germany.
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Sibaev A, Fichna J, Saur D, Yuece B, Timmermans JP, Storr M. Nociceptin effect on intestinal motility depends on opioid-receptor like-1 receptors and nitric oxide synthase co-localization. World J Gastrointest Pharmacol Ther 2015; 6:73-83. [PMID: 26261735 PMCID: PMC4526842 DOI: 10.4292/wjgpt.v6.i3.73] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 01/10/2015] [Accepted: 05/18/2015] [Indexed: 02/06/2023] Open
Abstract
AIM: To study the effect of the opioid-receptor like-1 (ORL1) agonist nociceptin on gastrointestinal (GI) myenteric neurotransmission and motility.
METHODS: Reverse transcriptase - polymerase chain reaction and immunohistochemistry were used to localize nociceptin and ORL1 in mouse tissues. Intracellular electrophysiological recordings of excitatory and inhibitory junction potentials (EJP, IJP) were made in a chambered organ bath. Intestinal motility was measured in vivo.
RESULTS: Nociceptin accelerated whole and upper GI transit, but slowed colonic expulsion in vivo in an ORL1-dependent manner, as shown using [Nphe1]NOC and AS ODN pretreatment. ORL1 and nociceptin immunoreactivity were found on enteric neurons. Nociceptin reduced the EJP and the nitric oxide-sensitive slow IJP in an ORL1-dependent manner, whereas the fast IJP was unchanged. Nociceptin further reduced the spatial spreading of the EJP up to 2 cm.
CONCLUSION: Compounds acting at ORL1 are good candidates for the future treatment of disorders associated with increased colonic transit, such as diarrhea or diarrhea-predominant irritable bowel syndrome.
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Chaudhury A. A Hypothesis for Examining Skeletal Muscle Biopsy-Derived Sarcolemmal nNOSμ as Surrogate for Enteric nNOSα Function. Front Med (Lausanne) 2015; 2:48. [PMID: 26284245 PMCID: PMC4517061 DOI: 10.3389/fmed.2015.00048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 07/10/2015] [Indexed: 12/13/2022] Open
Abstract
The pathophysiology of gastrointestinal motility disorders is controversial and largely unresolved. This provokes empiric approaches to patient management of these so-called functional gastrointestinal disorders. Preliminary evidence demonstrates that defects in neuronal nitric oxide synthase (nNOS) expression and function, the enzyme that synthesizes nitric oxide (NO), the key inhibitory neurotransmitter mediating mechano-electrical smooth muscle relaxation, is the major pathophysiological basis for sluggishness of oro-aboral transit of luminal contents. This opinion is an ansatz of the potential of skeletal muscle biopsy and examining sarcolemmal nNOSμ to provide complementary insights regarding nNOSα expression, localization, and function within enteric nerve terminals, the site of stimulated de novo NO synthesis. The main basis of this thesis is twofold: (a) the molecular similarity of the structures of nNOS α and μ, similar mechanisms of localizations to “active zones” of nitrergic synthesis, and same mechanisms of electron transfers during NO synthesis and (b) pragmatic difficulty to routinely obtain full-thickness biopsies of gastrointestinal tract, even in patients presenting with the most recalcitrant manifestations of stasis and delayed transit of luminal contents. This opinion attempts to provoke dialog whether this approach is feasible as a surrogate to predict catalytic potential of nNOSα and defects in nitrergic neurotransmission. This discussion makes an assumption that similar molecular mechanisms of nNOS defects shall be operant in both the enteric nerve terminals and the skeletal muscles. These overlaps of skeletal and gastrointestinal dysfunction are largely unknown, thus meriting that the thesis be validated in future by proof-of-principle experiments.
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Zhang YH, Jin CZ, Jang JH, Wang Y. Molecular mechanisms of neuronal nitric oxide synthase in cardiac function and pathophysiology. J Physiol 2014; 592:3189-200. [PMID: 24756636 DOI: 10.1113/jphysiol.2013.270306] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Neuronal nitric oxide synthase (nNOS or NOS1) is the major endogenous source of myocardial nitric oxide (NO), which facilitates cardiac relaxation and modulates contraction. In the healthy heart it regulates intracellular Ca(2+), signalling pathways and oxidative homeostasis and is upregulated from early phases upon pathogenic insult. nNOS plays pivotal roles in protecting the myocardium from increased oxidative stress, systolic/diastolic dysfunction, adverse structural remodelling and arrhythmias in the failing heart. Here, we show that the downstream target proteins of nNOS and underlying post-transcriptional modifications are shifted during disease progression from Ca(2+)-handling proteins [e.g. PKA-dependent phospholamban phosphorylation (PLN-Ser(16))] in the healthy heart to cGMP/PKG-dependent PLN-Ser(16) with acute angiotensin II (Ang II) treatment. In early hypertension, nNOS-derived NO is involved in increases of cGMP/PKG-dependent troponin I (TnI-Ser(23/24)) and cardiac myosin binding protein C (cMBP-C-Ser(273)). However, nNOS-derived NO is shown to increase S-nitrosylation of various Ca(2+)-handling proteins in failing myocardium. The spatial compartmentation of nNOS and its translocation for diverse binding partners in the diseased heart or various nNOS splicing variants and regulation in response to pathological stress may be responsible for varied underlying mechanisms and functions. In this review, we endeavour to outline recent advances in knowledge of the molecular mechanisms mediating the functions of nNOS in the myocardium in both normal and diseased hearts. Insights into nNOS gene regulation in various tissues are discussed. Overall, nNOS is an important cardiac protector in the diseased heart. The dynamic localization and various mediating mechanisms of nNOS ensure that it is able to regulate functions effectively in the heart under stress.
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Affiliation(s)
- Yin Hua Zhang
- Department of Physiology, College of Medicine, Seoul National University, Seoul, South Korea Ischaemic/Hypoxic Disease Institute, College of Medicine, Seoul National University, Seoul, South Korea Clinical Research Center, Yanbian University Hospital, Yanji, Jilin Province, China
| | - Chun Zi Jin
- Clinical Research Center, Yanbian University Hospital, Yanji, Jilin Province, China
| | - Ji Hyun Jang
- Department of Physiology, College of Medicine, Seoul National University, Seoul, South Korea
| | - Yue Wang
- Department of Physiology, College of Medicine, Seoul National University, Seoul, South Korea
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Halbig KM, Lekven AC, Kunkel GR. The transcriptional activator ZNF143 is essential for normal development in zebrafish. BMC Mol Biol 2012; 13:3. [PMID: 22268977 PMCID: PMC3282657 DOI: 10.1186/1471-2199-13-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Accepted: 01/23/2012] [Indexed: 12/25/2022] Open
Abstract
Background ZNF143 is a sequence-specific DNA-binding protein that stimulates transcription of both small RNA genes by RNA polymerase II or III, or protein-coding genes by RNA polymerase II, using separable activating domains. We describe phenotypic effects following knockdown of this protein in developing Danio rerio (zebrafish) embryos by injection of morpholino antisense oligonucleotides that target znf143 mRNA. Results The loss of function phenotype is pleiotropic and includes a broad array of abnormalities including defects in heart, blood, ear and midbrain hindbrain boundary. Defects are rescued by coinjection of synthetic mRNA encoding full-length ZNF143 protein, but not by protein lacking the amino-terminal activation domains. Accordingly, expression of several marker genes is affected following knockdown, including GATA-binding protein 1 (gata1), cardiac myosin light chain 2 (cmlc2) and paired box gene 2a (pax2a). The zebrafish pax2a gene proximal promoter contains two binding sites for ZNF143, and reporter gene transcription driven by this promoter in transfected cells is activated by this protein. Conclusions Normal development of zebrafish embryos requires ZNF143. Furthermore, the pax2a gene is probably one example of many protein-coding gene targets of ZNF143 during zebrafish development.
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Affiliation(s)
- Kari M Halbig
- Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-2128, USA
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15
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Clinical Application and Identification of Proteomics in Colonic Mucosa of Sub-health People With Constipation*. PROG BIOCHEM BIOPHYS 2011. [DOI: 10.3724/sp.j.1206.2011.00341] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Adhesion-dependent Skp2 transcription requires selenocysteine tRNA gene transcription-activating factor (STAF). Biochem J 2011; 436:133-43. [PMID: 21352097 DOI: 10.1042/bj20101798] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Cell adhesion is essential for cell cycle progression in most normal cells. Loss of adhesion dependence is a hallmark of cellular transformation. The F-box protein Skp2 (S-phase kinase-associated protein 2) controls G(1)-S-phase progression and is subject to adhesion-dependent transcriptional regulation, although the mechanisms are poorly understood. We identify two cross-species conserved binding elements for the STAF (selenocysteine tRNA gene transcription-activating factor) in the Skp2 promoter that are essential for Skp2 promoter activity. Endogenous STAF specifically binds these elements in EMSA (electrophoretic mobility-shift assay) and ChIP (chromatin immunoprecipitation) analysis. STAF is sufficient and necessary for Skp2 promoter activity since exogenous STAF activates promoter activity and expression and STAF siRNA (small interfering RNA) inhibits Skp2 promoter activity, mRNA and protein expression and cell proliferation. Furthermore, ectopic Skp2 expression completely reverses the inhibitory effects of STAF silencing on proliferation. Importantly, STAF expression and binding to the Skp2 promoter is adhesion-dependent and associated with adhesion-dependent Skp2 expression in non-transformed cells. Ectopic STAF rescues Skp2 expression in suspension cells. Taken together, these results demonstrate that STAF is essential and sufficient for Skp2 promoter activity and plays a role in the adhesion-dependent expression of Skp2 and ultimately cell proliferation.
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Gazquez I, Lopez-Escamez JA, Moreno A, Campbell CA, Meyer NC, Carey JP, Minor LB, Gantz BJ, Hansen MR, Santina CCD, Aran I, Soto-Varela A, Santos S, Batuecas A, Perez-Garrigues H, Lopez-Nevot A, Smith RJ, Lopez-Nevot MA. Functional Variants in NOS1 and NOS2A Are Not Associated with Progressive Hearing Loss in Ménière's Disease in a European Caucasian Population. DNA Cell Biol 2011; 30:699-708. [DOI: 10.1089/dna.2011.1259] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Irene Gazquez
- Otology and Neurotology Group CTS495, GENYO, Centro de Genómica e Investigación Oncológica–Pfizer, Universidad de Granada, Junta de Andalucía, Granada, Spain
- Department of Immunology, Hospital Virgen de las Nieves, University of Granada, Granada, Spain
| | - Jose A. Lopez-Escamez
- Otology and Neurotology Group CTS495, GENYO, Centro de Genómica e Investigación Oncológica–Pfizer, Universidad de Granada, Junta de Andalucía, Granada, Spain
- Otology and Neurotology Group CTS495, Department of Otolaryngology, Hospital de Poniente, El Ejido, Almería, Spain
| | - Antonia Moreno
- Department of Immunology, Hospital Virgen de las Nieves, University of Granada, Granada, Spain
| | | | - Nicole C. Meyer
- Department of Otolaryngology, University of Iowa, Iowa City, Iowa
| | - John P. Carey
- Departments of Otolaryngology—Head and Neck Surgery, Biomedical Engineering, and Neuroscience, Johns Hopkins University, Baltimore, Maryland
| | - Lloyd B. Minor
- Departments of Otolaryngology—Head and Neck Surgery, Biomedical Engineering, and Neuroscience, Johns Hopkins University, Baltimore, Maryland
| | - Bruce J. Gantz
- Department of Otolaryngology, University of Iowa, Iowa City, Iowa
| | - Marlan R. Hansen
- Department of Otolaryngology, University of Iowa, Iowa City, Iowa
| | - Charles C. Della Santina
- Departments of Otolaryngology—Head and Neck Surgery, Biomedical Engineering, and Neuroscience, Johns Hopkins University, Baltimore, Maryland
| | - Ismael Aran
- Department of Otolaryngology, Complejo Hospitalario de Pontevedra, Pontevedra, Spain
| | - Andres Soto-Varela
- Division of Otoneurology, Department of Otorhinolaryngology, Hospital Clinico Universitario, Santiago de Compostela, Santiago, Spain
| | - Sofia Santos
- Division of Otoneurology, Department of Otorhinolaryngology, Hospital Clinico Universitario, Santiago de Compostela, Santiago, Spain
| | - Angel Batuecas
- Department Otolaryngology, Hospital Universitario Salamanca, Salamanca, Spain
| | | | - Alicia Lopez-Nevot
- Otology and Neurotology Group CTS495, Department of Otolaryngology, Hospital Virgen de las Nieves, University of Granada, Granada, Spain
| | | | - Miguel A. Lopez-Nevot
- Department of Immunology, Hospital Virgen de las Nieves, University of Granada, Granada, Spain
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Werder AV, Mayr M, Schneider G, Oesterle D, Fritsch RM, Seidler B, Schlossmann J, Hofmann F, Schemann M, Allescher HD, Schmid RM, Saur D. Truncated IRAG variants modulate cGMP-mediated inhibition of human colonic smooth muscle cell contraction. Am J Physiol Cell Physiol 2011; 301:C1445-57. [PMID: 21865585 DOI: 10.1152/ajpcell.00304.2010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Nitric oxide (NO) induces relaxation of colonic smooth muscle cells predominantly by cGMP/cGMP-dependent protein kinase I (cGKI)-induced phosphorylation of the inositol 1,4,5-trisphosphate receptor (IP(3)R)-associated cGMP kinase substrate (IRAG), to block store-dependent calcium signaling. In the present study we analyzed the structure and function of the human IRAG/MRVI1 gene. We describe four unique first exon variants transcribed from individual promoters in diverse human tissues. Tissue-specific alternative splicing with exon skipping and alternative splice donor and acceptor site usage further increases diversity of IRAG mRNA variants that encode for NH(2)- and COOH-terminally truncated proteins. At the functional level, COOH-terminally truncated IRAG variants lacking both the cGKI phosphorylation and the IP(3)RI interaction site counteract cGMP-mediated inhibition of calcium transients and relaxation of human colonic smooth muscle cells. Since COOH-terminally truncated IRAG mRNA isoforms are widely expressed in human tissues, our results point to an important role of IRAG variants as negative modulators of nitric oxide/cGKI-dependent signaling. The complexity of alternative splicing of the IRAG gene impressively demonstrates how posttranscriptional processing generates functionally distinct proteins from a single gene.
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Affiliation(s)
- Alexander von Werder
- II. Medizinische Klinik, Technische Universität München, Ismaninger Strasse 22, Munich, Germany
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Qiao H, May JM. Regulation of the human ascorbate transporter SVCT2 exon 1b gene by zinc-finger transcription factors. Free Radic Biol Med 2011; 50:1196-209. [PMID: 21335086 PMCID: PMC3070803 DOI: 10.1016/j.freeradbiomed.2011.02.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 02/07/2011] [Accepted: 02/08/2011] [Indexed: 01/23/2023]
Abstract
The sodium-dependent vitamin C transporter (SVCT) 2 is crucial for ascorbate uptake in metabolically active and specialized tissues. This study focused on the gene regulation of SVCT2 exon 1b, which is ubiquitously expressed in human and mouse tissues. Although the human SVCT2 exon 1b promoter does not contain a classical TATA box, we found that it does contain a functional initiator that binds Yin Yang-1 (YY1) and interacts with upstream Sp1/Sp3 elements in the proximal promoter region. These elements in turn play a critical role in regulating YY1-mediated transcription of exon 1b. Formation of YY1/Sp complexes on the promoter is required for its optional function. YY1 with Sp1 or Sp3 synergistically enhanced exon 1b promoter activity as well as the endogenous SVCT2 protein expression. Further, in addition to Sp1/Sp3, both EGR-1 and EGR-2 were detected in the protein complexes that bound the three GC boxes bearing overlapping binding sites for EGR/WT1 and Sp1/3. The EGR family factors WT1 and MAZ were found to differentially regulate exon 1b promoter activity. These results show that differential occupancy of transcription factors on the GC-rich consensus sequences in the SVCT2 exon 1b promoter contributes to the regulation of cell and tissue expression of SVCT2.
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Affiliation(s)
- Huan Qiao
- Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232–6303, USA.
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20
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Jin H, Kanthasamy A, Anantharam V, Rana A, Kanthasamy AG. Transcriptional regulation of pro-apoptotic protein kinase Cdelta: implications for oxidative stress-induced neuronal cell death. J Biol Chem 2011; 286:19840-59. [PMID: 21467032 DOI: 10.1074/jbc.m110.203687] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
We previously demonstrated that protein kinase Cδ (PKCδ; PKC delta) is an oxidative stress-sensitive kinase that plays a causal role in apoptotic cell death in neuronal cells. Although PKCδ activation has been extensively studied, relatively little is known about the molecular mechanisms controlling PKCδ expression. To characterize the regulation of PKCδ expression, we cloned an ∼2-kbp 5'-promoter segment of the mouse Prkcd gene. Deletion analysis indicated that the noncoding exon 1 region contained multiple Sp sites, including four GC boxes and one CACCC box, which directed the highest levels of transcription in neuronal cells. In addition, an upstream regulatory region containing adjacent repressive and anti-repressive elements with opposing regulatory activities was identified within the region -712 to -560. Detailed mutagenesis studies revealed that each Sp site made a positive contribution to PKCδ promoter expression. Overexpression of Sp family proteins markedly stimulated PKCδ promoter activity without any synergistic transactivating effect. Furthermore, experiments in Sp-deficient SL2 cells indicated long isoform Sp3 as the essential activator of PKCδ transcription. Importantly, both PKCδ promoter activity and endogenous PKCδ expression in NIE115 cells and primary striatal cultures were inhibited by mithramycin A. The results from chromatin immunoprecipitation and gel shift assays further confirmed the functional binding of Sp proteins to the PKCδ promoter. Additionally, we demonstrated that overexpression of p300 or CREB-binding protein increases the PKCδ promoter activity. This stimulatory effect requires intact Sp-binding sites and is independent of p300 histone acetyltransferase activity. Finally, modulation of Sp transcriptional activity or protein level profoundly altered the cell death induced by oxidative insult, demonstrating the functional significance of Sp-dependent PKCδ gene expression. Collectively, our findings may have implications for development of new translational strategies against oxidative damage.
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Affiliation(s)
- Huajun Jin
- Parkinson's Disorder Research Laboratory, Iowa Center for Advanced Neurotoxicology, Department of Biomedical Sciences, Iowa State University, Ames, Iowa 50011, USA
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Schlenker B, Matiasek K, Saur D, Gratzke C, Bauer RM, Herouy Y, Arndt C, Blesch A, Hartung R, Stief CG, Weidner N, May F. Effects of cavernous nerve reconstruction on expression of nitric oxide synthase isoforms in rats. BJU Int 2010; 106:1726-31. [DOI: 10.1111/j.1464-410x.2010.09364.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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22
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Silberberg G, Ben-Shachar D, Navon R. Genetic analysis of nitric oxide synthase 1 variants in schizophrenia and bipolar disorder. Am J Med Genet B Neuropsychiatr Genet 2010; 153B:1318-28. [PMID: 20645313 DOI: 10.1002/ajmg.b.31112] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Nitric oxide (NO) is a neurotransmitter that acts as a second messenger of the N-methyl-D-aspartate receptor and interacts with the dopaminergic and the serotonergic systems. NO involvement in pathological processes relevant to neuropsychiatric disorders stems from its ability to modulate certain forms of synaptic plasticity, and from its capacity to be transformed to a highly active free radical. Additionally, multiple links have been reported between the NO-producing enzyme, nitric oxide synthase (NOS) 1, and both schizophrenia and bipolar disorder (BPD). RNA and DNA isolated from dorsolateral-prefrontal cortices of schizophrenia patients, bipolar patients and controls (n = 26, 30 and 29, respectively) were donated by the Stanley Foundation Brain Collection. Gene expression was measured by Real-Time-PCR. Genetic polymorphisms were genotyped by restriction-fragment length-polymorphism analysis, and by product-size determination of PCR products amplified with a fluorescent primer.Expression analysis of pan-NOS1, as well as of 2 of its isoforms, "NOS1_1d" and "NOS1_1f", which differ in their first exons and translational strength, revealed a trend for pan-NOS1 over-expression (P = 0.075) in schizophrenia patients (1.33-fold), and significant over-expression (P < 0.05) of NOS1_1d and NOS1_1f in this group (1.54-fold and 1.61-fold, respectively). No expressional alteration was observed in BPD. Polymorphisms at the promoters of NOS1_1d and NOS1_1f, previously shown to be functional in vitro, revealed no significant allelic or genotypic differences among clinical groups and showed no effect on these transcripts' expression. In conclusion, understanding the molecular mechanisms underlying the over-expression of specific NOS1 isoforms, which is unique to schizophrenia, may assist in identifying targets for new drugs.
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Affiliation(s)
- Gilad Silberberg
- Department of Human Genetics and Biochemistry, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel.
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23
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Toscano MG, Benabdellah K, Muñoz P, Frecha C, Cobo M, Martín F. Was cDNA sequences modulate transgene expression of was promoter-driven lentiviral vectors. Hum Gene Ther 2010; 20:1279-90. [PMID: 19630517 DOI: 10.1089/hum.2009.118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Abstract The development of vectors that express a therapeutic transgene efficiently and specifically in hematopoietic cells (HCs) is an important goal for gene therapy of hematological disorders. We have previously shown that a 500-bp fragment from the proximal Was gene promoter in a lentiviral vector (LV) was sufficient to achieve more than 100-fold higher levels of Wiskott-Aldrich syndrome protein in HCs than in nonhematopoietic cells (non-HCs). We show now that this differential was reduced up to 10 times when the enhanced green fluorescent protein gene (eGFP) was expressed instead of Was in the same LV backbone. Insertion of Was cDNA sequences downstream of eGFP in these LVs had a negative effect on transgene expression. This effect varied in different cell types but, overall, Was cDNA sequences increased the hematopoietic specificity of Was promoter-driven LV. We have characterized the minimal fragment required to increase hematopoietic specificity and have demonstrated that the mechanism involves Was promoter regulation and RNA processing. In addition, we have shown that Was cDNA sequences interfere with the enhancer activity of the woodchuck posttranscriptional regulatory element. These results represent the first data showing the role of Was intragenic sequences in gene regulation.
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Affiliation(s)
- Miguel G Toscano
- Immunology and Cell Biology Department, Institute of Parasitology and Biomedicine López Neyra-CSIC, Parque Tecnológico Ciencias de la Salud, Granada, Spain
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von Burstin J, Reichert M, Wescott MP, Rustgi AK. The pancreatic and duodenal homeobox protein PDX-1 regulates the ductal specific keratin 19 through the degradation of MEIS1 and DNA binding. PLoS One 2010; 5:e12311. [PMID: 20808819 PMCID: PMC2924401 DOI: 10.1371/journal.pone.0012311] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Accepted: 07/27/2010] [Indexed: 01/15/2023] Open
Abstract
Background Pancreas organogenesis is the result of well-orchestrated and balanced activities of transcription factors. The homeobox transcription factor PDX-1 plays a crucial role in the development and function of the pancreas, both in the maintenance of progenitor cells and in determination and maintenance of differentiated endocrine cells. However, the activity of homeobox transcription factors requires coordination with co-factors, such as PBX and MEIS proteins. PBX and MEIS proteins belong to the family of three amino acid loop extension (TALE) homeodomain proteins. In a previous study we found that PDX-1 negatively regulates the transcriptional activity of the ductal specific keratin 19 (Krt19). In this study, we investigate the role of different domains of PDX-1 and elucidate the functional interplay of PDX-1 and MEIS1 necessary for Krt19 regulation. Methodology/Principal Findings Here, we demonstrate that PDX-1 exerts a dual manner of regulation of Krt19 transcriptional activity. Deletion studies highlight that the NH2-terminus of PDX-1 is functionally relevant for the down-regulation of Krt19, as it is required for DNA binding of PDX-1 to the Krt19 promoter. Moreover, this effect occurs independently of PBX. Second, we provide insight on how PDX-1 regulates the Hox co-factor MEIS1 post-transcriptionally. We find specific binding of MEIS1 and MEIS2 to the Krt19 promoter using IP-EMSA, and siRNA mediated silencing of Meis1, but not Meis2, reduces transcriptional activation of Krt19 in primary pancreatic ductal cells. Over-expression of PDX-1 leads to a decreased level of MEIS1 protein, and this decrease is prevented by inhibition of the proteasome. Conclusions/Significance Taken together, our data provide evidence for a dual mechanism of how PDX-1 negatively regulates Krt19 ductal specific gene expression. These findings imply that transcription factors may efficiently regulate target gene expression through diverse, non-redundant mechanisms.
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Affiliation(s)
- Johannes von Burstin
- Division of Gastroenterology, Departments of Medicine and Genetics, Abramson Cancer Center, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Maximilian Reichert
- Division of Gastroenterology, Departments of Medicine and Genetics, Abramson Cancer Center, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Melanie P. Wescott
- Division of Gastroenterology, Departments of Medicine and Genetics, Abramson Cancer Center, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Anil K. Rustgi
- Division of Gastroenterology, Departments of Medicine and Genetics, Abramson Cancer Center, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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A putative cis-acting polymorphism in the NOS1 gene is associated with schizophrenia and NOS1 immunoreactivity in the postmortem brain. Schizophr Res 2010; 121:172-8. [PMID: 20605417 DOI: 10.1016/j.schres.2010.05.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2009] [Revised: 03/16/2010] [Accepted: 05/07/2010] [Indexed: 11/23/2022]
Abstract
Schizophrenia is a devastating neurodevelopmental disorder whose genetic influences remain elusive. Recent genome-wide scans revealed that rare structural variants disrupted multiple genes in neurodevelopmental pathways, which strongly implicate nitric oxide (NO) signaling in schizophrenia. NO acts as a second messenger of N-methyl-D aspartate receptor activation, which further interacts with both dopaminergic and serotonergic pathways. NO is mainly synthesized by neuronal nitric oxide synthase (NOS1) in the brain, and its gene locus, 12q24.2, has attracted much attention as a major linkage region for schizophrenia. Genetic variations of NOS1 have also been associated with schizophrenia, and differential expression of NOS1 was observed in the postmortem brain of schizophrenic patients. Here, we explored the hypothesis that a putative cis-acting G-84A single nucleotide polymorphism (SNP; rs41279104) in the exon 1c promoter region of the NOS1 gene is associated with the levels of NOS1 immunoreactivity in postmortem prefrontal cortex specimens regardless of disease phenotype. Individuals with the A-allele of this SNP showed significantly lower levels of NOS1 immunoreactivity than did GG homozygotes (p=0.002). Furthermore, a case-control study using 720 individuals in a Japanese population revealed a significant association between the SNP and schizophrenia (genotypic p=0.0013 and allelic p=0.0011). Additionally, the average of onset age in schizophrenic patients with the A-allele was significantly earlier than GG homozygotes (p=0.018). When the analyses took gender into account, this significance was more significant for female. These findings provide further evidences that NOS1 is associated with a biological susceptibility gene to schizophrenia.
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Miao X, Garcia-Barceló MM, So MT, Tang WK, Dong X, Wang B, Mao J, Ngan ESW, Chen Y, Lui VCH, Wong KKY, Liu L, Tam PKH. Lack of association between nNOS -84G>A polymorphism and risk of infantile hypertrophic pyloric stenosis in a Chinese population. J Pediatr Surg 2010; 45:709-13. [PMID: 20385275 DOI: 10.1016/j.jpedsurg.2009.07.067] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Revised: 07/31/2009] [Accepted: 07/31/2009] [Indexed: 01/03/2023]
Abstract
BACKGROUND Infantile hypertrophic pyloric stenosis (IHPS) is one of the most common gastrointestinal obstructions in the infancy requiring surgery. Reduced expression of neuronal nitric oxide synthase (nNOS), which plays an important role in the regulation of the human pyloric muscle, is thought to underlie IHPS. The role of nNOS in IHPS has been supported by the genetic association of a functional regulatory nNOS polymorphism (-84G>A) with IHPS in whites. We reasoned that the corroboration of this association in a population of different ethnic origin would prompt follow-up studies and further investigation of the IHPS pathology at molecular level. Thus, we attempted to reproduce the original findings in a Chinese population of comparable size in what would be the first genetic study on IHPS conducted in Chinese. METHODS nNOS -84G>A genotypes were analyzed in 56 patients and 86 controls by polymerase chain reaction and DNA sequencing. Logistic regression was used to compute odds ratios. RESULTS Our study could not corroborate the association previously reported. Although the frequency of the IHPS-associated allele (-84A) in controls (0.205) was similar to that reported for white controls, there was a dramatic difference in -84A frequencies between white and Chinese patients (0.198). Similarly, there was no difference in the nNOS -84G>A genotype distribution between patients and controls, even when the GA and AA genotypes were combined to compare GG genotype (odds ratio, 1.01; 95% confidence interval, 0.47-2.19). CONCLUSIONS Failure to replicate the initial finding does not detract from its validity, because genetic effects may differ across populations. Differences across populations in linkage disequilibrium and/or allele frequencies may contribute to this lack of replication. The role nNOS in IHPS awaits further investigation.
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Affiliation(s)
- Xiaoping Miao
- Department of Surgery, Shenzhen Children's Hospital, Shenzhen, China
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Giove TJ, Deshpande MM, Eldred WD. Identification of alternate transcripts of neuronal nitric oxide synthase in the mouse retina. J Neurosci Res 2009; 87:3134-42. [PMID: 19479987 DOI: 10.1002/jnr.22133] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Nitric oxide (NO) is a major signaling molecule in the retina and CNS, with physiological roles in every cell type in the retina. Previous work shows that neuronal nitric oxide synthase (nNOS) is an important source of NO in the vertebrate retina. There are distinct, active alternative transcripts of nNOS observed in many tissues, including testes and brain, that may differ in both localization and enzyme kinetics. The present study characterized nNOS and the NO production from nNOS in the mouse retina in terms of its alternate transcripts, namely, nNOS alpha, nNOS beta, and nNOS gamma. We examined both basal and light-stimulated NO production as imaged using the NO-sensitive dye 4-amino-5-methylamino-2',7'-difluorofluorescein diacetate-FM (DAF-FM), and we compared the NO production with the immunocytochemical localization of nNOS using antisera that recognize nNOS alpha/beta or nNOS alpha/beta/gamma. Western blots suggested the presence of NOS alpha/gamma protein in retina, but not nNOS beta, and we confirmed this at the message level by using a combination of RT-PCR and quantitative real-time PCR. Our findings indicated that the primary source of NO in the mammalian retina is nNOS alpha and that nNOS gamma may contribute to NO production as well.
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Affiliation(s)
- Thomas J Giove
- Laboratory of Visual Neurobiology, Department of Biology, Boston University, Boston, Massachusetts 02215, USA
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28
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Nagl F, Schönhofer K, Seidler B, Mages J, Allescher HD, Schmid RM, Schneider G, Saur D. Retinoic acid-induced nNOS expression depends on a novel PI3K/Akt/DAX1 pathway in human TGW-nu-I neuroblastoma cells. Am J Physiol Cell Physiol 2009; 297:C1146-56. [PMID: 19726747 DOI: 10.1152/ajpcell.00034.2009] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Neuronal nitric oxide synthase (nNOS)-derived nitric oxide (NO) acts as a neurotransmitter and intracellular signaling molecule in the central and peripheral nervous system. NO regulates multiple processes like neuronal development, plasticity, and differentiation and is a mediator of neurotoxicity. The nNOS gene is highly complex with 12 alternative first exons, exon 1a-1l, transcribed from distinct promoters, leading to nNOS variants with different 5'-untranslated regions. Transcriptional control of the nNOS gene is not understood in detail. To investigate regulation of nNOS gene expression by retinoic acid (RA), we used the human neuroblastoma cell line TGW-nu-I as a model system. We show that RA induces nNOS transcription in a protein synthesis-dependent fashion. We identify the phosphatidylinositol 3-kinase (PI3K)/Akt signaling pathway and the atypical orphan nuclear receptor DAX1 (NR0B1) as critical mediators involved in RA-induced nNOS gene transcription. RA treatment increases DAX1 expression via PI3K/Akt signaling. Upregulation of DAX1 expression in turn induces nNOS transcription in response to RA. These results identify nNOS as a target gene of a novel RA/PI3K/Akt/DAX1-dependent pathway in human neuroblastoma cells and stress the functional importance of the transcriptional regulator DAX1 for nNOS gene expression in response to RA treatment.
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Affiliation(s)
- Florian Nagl
- II. Medizinische Klinik, Technische Universität München, 81675 Munich, Germany
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29
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von Burstin J, Eser S, Paul MC, Seidler B, Brandl M, Messer M, von Werder A, Schmidt A, Mages J, Pagel P, Schnieke A, Schmid RM, Schneider G, Saur D. E-cadherin regulates metastasis of pancreatic cancer in vivo and is suppressed by a SNAIL/HDAC1/HDAC2 repressor complex. Gastroenterology 2009; 137:361-71, 371.e1-5. [PMID: 19362090 DOI: 10.1053/j.gastro.2009.04.004] [Citation(s) in RCA: 279] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2008] [Revised: 03/16/2009] [Accepted: 04/02/2009] [Indexed: 12/14/2022]
Abstract
BACKGROUND & AIMS Early metastasis is a hallmark of pancreatic ductal adenocarcinoma and responsible for >90% of pancreatic cancer death. Because little is known about the biology and genetics of the metastatic process, we desired to elucidate molecular pathways mediating pancreatic cancer metastasis in vivo by an unbiased forward genetic approach. METHODS Highly metastatic pancreatic cancer cell populations were selected by serial in vivo passaging of parental cells with low metastatic potential and characterized by global gene expression profiling, chromatin immunoprecipitation, and in vivo metastatic assay. RESULTS In vivo selection of highly metastatic pancreatic cancer cells induced epithelial-mesenchymal transition (EMT), loss of E-cadherin expression, and up-regulation of mesenchymal genes such as Snail. Genetic inactivation of E-cadherin in parental cells induced EMT and increased metastasis in vivo. Silencing of E-cadherin in highly metastatic cells is mediated by a transcriptional repressor complex containing Snail and histone deacetylase 1 (HDAC1) and HDAC2. In line, mesenchymal pancreatic cancer specimens and primary cell lines from genetically engineered Kras(G12D) mice showed HDAC-dependent down-regulation of E-cadherin and high metastatic potential. Finally, transforming growth factor beta-driven E-cadherin silencing and EMT of human pancreatic cancer cells depends on HDAC activity. CONCLUSIONS We provide the first in vivo evidence that HDACs and Snail play an essential role in silencing E-cadherin during the metastatic process of pancreatic cancer cells. These data link the epigenetic HDAC machinery to EMT and metastasis and provide preclinical evidence that HDACs are promising targets for antimetastatic therapy.
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30
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von Burstin J, Eser S, Seidler B, Meining A, Bajbouj M, Mages J, Lang R, Kind AJ, Schnieke AE, Schmid RM, Schneider G, Saur D. Highly sensitive detection of early-stage pancreatic cancer by multimodal near-infrared molecular imaging in living mice. Int J Cancer 2008; 123:2138-47. [PMID: 18709639 DOI: 10.1002/ijc.23780] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Pancreatic cancer is a serious disease with poor patient outcome, often as a consequence of late diagnosis in advanced stages. This is in large part due to the lack of diagnostic tools for early detection. To address this deficiency, we have investigated novel molecular near-infrared fluorescent (NIRF) in vivo imaging techniques in clinically relevant mouse models of pancreatic cancer. Genome wide gene expression profiling was used to identify cathepsin cystein proteases and matrix metalloproteinases (MMP) as targets for NIRF imaging. Appropriate protease activatable probes were evaluated for detection of early-stage pancreatic cancer in mice with orthotopically implanted pancreatic cancer cell lines. Mice with pancreatitis served as controls. Whole body in vivo NIRF imaging using activatable cathepsin sensitive probes specifically detected pancreatic tumors as small as 1-2 mm diameter. Imaging of MMP activity demonstrated high specificity for MMP positive tumors. Intravital flexible confocal fluorescence lasermicroscopy of protease activity enabled specific detection of pancreatic tumors at the cellular level. Importantly, topical application of NIRF-probes markedly reduced background without altering signal intensity. Taken together, macroscopic and confocal lasermicroscopic molecular in vivo imaging of protease activity is highly sensitive, specific and allows discrimination between normal pancreatic tissue, inflammation and pancreatic cancer. Translation of this approach to the clinic could significantly improve endoscopic and laparoscopic detection of early-stage pancreatic cancer.
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Affiliation(s)
- Johannes von Burstin
- Department of Internal Medicine II, Technical University of Munich, Munich, Germany
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31
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Mayr U, Werder AV, Seidler B, Reindl W, Bajbouj M, Schmid RM, Schneider G, Saur D. RCAS-Mediated Retroviral Gene Delivery: A Versatile Tool for the Study of Gene Function in a Mouse Model of Pancreatic Cancer. Hum Gene Ther 2008; 19:896-906. [DOI: 10.1089/hum.2008.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- Ulrich Mayr
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Alexander von Werder
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Barbara Seidler
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Wolfgang Reindl
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Monther Bajbouj
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Roland M. Schmid
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Günter Schneider
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
| | - Dieter Saur
- Department of Internal Medicine II, Klinikum Rechts der Isar, Technische Universität München, 81675 Munich, Germany
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32
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Venturelli E, Villa C, Scarpini E, Fenoglio C, Guidi I, Lovati C, Marcone A, Cortini F, Scalabrini D, Clerici F, Bresolin N, Mariani C, Cappa S, Galimberti D. Neuronal nitric oxide synthase C276T polymorphism increases the risk for frontotemporal lobar degeneration. Eur J Neurol 2007; 15:77-81. [PMID: 18042235 DOI: 10.1111/j.1468-1331.2007.02007.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The neuronal nitric oxide synthase (nNOS) is abundantly expressed in the brain and its transcripts have been found in the frontal cerebral cortex. Eighty-nine patients with different neurodegenerative tau-related disorders, including 71 patients with frontotemporal lobar degeneration (FTLD), 12 with progressive supranuclear palsy (PSP) and 6 with corticobasal degeneration (CBD), were genotyped for the C276T single nucleotide polymorphism (SNP) in exon 29 of the nNOS gene and compared with 190 age-matched controls (CON). A significantly increased allelic frequency of the T allele was observed in patients compared with CON (40.4% vs. 29.7%, P = 0.014, OR: 1.94, CI: 1.15-3.27). Considering each disorder separately, significance was reached for FTLD only (39.4%, P = 0.0248 versus controls, OR: 1.96, CI: 1.11-3.47). However, the frequency of the T allele was elevated also in patients with PSP (45.8%) and CBD (41.7%). No differences were observed stratifying according to gender or apolipoprotein E status. The C276T SNP acts as risk factor for sporadic FTLD, possibly influencing NOS1 transcription. Studies in larger populations are needed to confirm its role in PSP and CBD.
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Affiliation(s)
- E Venturelli
- Department of Neurological Sciences, Dino Ferrari Center, University of Milan, IRCCS Ospedale Maggiore Policlinico, Milan, Italy
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33
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Gérard MA, Krol A, Carbon P. Transcription factor hStaf/ZNF143 is required for expression of the human TFAM gene. Gene 2007; 401:145-53. [PMID: 17707600 DOI: 10.1016/j.gene.2007.07.011] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Revised: 07/02/2007] [Accepted: 07/12/2007] [Indexed: 12/17/2022]
Abstract
The mitochondrial transcription factor A (Tfam) is essential for transcription initiation and replication of mitochondrial DNA. It was previously reported that transcription factors Sp1, NRF-1, NRF-2 were critical for maintaining the normal transcription levels of the mammalian TFAM gene. In this work, investigation of the transcriptional regulation of the human TFAM gene revealed the presence of two cross-species conserved binding sites for the transcription factor hStaf/ZNF143. By using promoter binding assays, transient expression of mutant TFAM reporter gene constructs and chromatin immunoprecipitation experiments, we provided insight into the involvement of hStaf/ZNF143 in promoter activity. Furthermore, we reported the identification of two other functionally important elements. Altogether, our data led to the conclusion that the promoter of the human TFAM gene harbors a complex organization with at least six transcriptional regulatory elements.
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Affiliation(s)
- Marie-Aline Gérard
- Architecture et Réactivité de l'ARN, Université Louis Pasteur de Strasbourg, CNRS, IBMC, 15 rue René Descartes, 67084 Strasbourg, France
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34
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Bros M, Boissel JP, Gödtel-Armbrust U, Förstermann U. The untranslated region of exon 2 of the human neuronal nitric oxide synthase (NOS1) gene exerts regulatory activity. Gene 2007; 405:36-46. [PMID: 17949925 DOI: 10.1016/j.gene.2007.08.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2007] [Revised: 08/27/2007] [Accepted: 08/29/2007] [Indexed: 11/19/2022]
Abstract
Expressional dysregulation of the human neuronal nitric oxide synthase (NOS1) gene represents an important mechanism in the pathogenesis of certain neuronal disease states. The structure and regulation of the human NOS1 gene is highly complex based on cell type- and stimulus-dependent usage of multiple exon 1 variants. Here we demonstrate that the untranslated region of exon 2 exerts promoter and enhancer functions as well, facilitated in large part by cooperative interaction of two conserved adjacent CREB/AP-1 binding sites. In human neuronal A673 cells, NOS1 expression is stimulated by several compounds which act through these sites, but also stimulate the combined promoter region of exons 1f and 1g. While stimulation of NOS1 expression by dibutyryl-cAMP is mediated by protein kinase A (blocked by H-89), the antiepileptic drug valproic acid is likely to activate phosphatidylinositol-3 kinase (inhibited by LY 294002).
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Affiliation(s)
- Matthias Bros
- Department of Dermatology, Johannes Gutenberg University, Mainz, Germany
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35
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Yüce B, Sibaev A, Haaken A, Saur D, Allescher HD, Göke B, Timmermans JP, Storr M. ORL-1 receptor mediates the action of nociceptin on ascending myenteric reflex pathways in rats. Gastroenterology 2007; 133:574-86. [PMID: 17681177 DOI: 10.1053/j.gastro.2007.05.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2006] [Accepted: 05/10/2007] [Indexed: 12/14/2022]
Abstract
BACKGROUND AND AIMS Nociceptin is the endogenous agonist of the "orphan" opioid receptor-1 (ORL-1). We investigated whether activation of the ORL-1 receptor influences smooth muscle contractility and enteric neurotransmission within ascending myenteric reflex pathways of rats. METHODS Reverse transcriptase polymerase chain reaction was performed to evaluate the presence of ORL-1 receptors. The ascending part of the ascending myenteric reflex in rats was studied in ileal segments using a 3-chambered organ bath. Intracellular recordings were performed to evaluate pharmacologic effects on excitatory and inhibitory junction potentials (EJP; IJP). Single- and double-labeling immunohistochemistry was used to examine the distribution of ORL-1 within the intestinal wall. RESULTS ORL-1 expression and immunoreactivity was found in the large majority of myenteric neurons. In addition to the cholinergic myenteric neurons, all nitrergic myenteric neurons expressed the ORL-1 receptor. Nociceptin significantly reduced cholinergic twitch contractions, an effect that was reversed by the ORL-1 receptor antagonist [Nphe(1)]nociceptin(1-13)NH(2). Neither nociceptin nor [Nphe(1)]nociceptin(1-13)NH(2) had a direct influence on smooth muscle contractility. Nociceptin significantly reduced ascending myenteric reflex contractions and prolonged the latency from stimulation to contraction. Both effects were antagonized by [Nphe(1)]nociceptin(1-13)NH(2). Intracellular recordings demonstrated that nociceptin reduces the cholinergically mediated EJP and the nitrergic phase of IJP in a concentration-dependent manner, effects that were reversible in presence of [Nphe(1)]nociceptin(1-13)NH(2). CONCLUSIONS We conclude that activation of ORL-1 receptors on myenteric neurons reduce excitatory and inhibitory neurotransmission within the gastrointestinal tract. This is accompanied by a reduction of the small intestinal peristaltic reflex response. These effects might be used pharmacologically.
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Affiliation(s)
- Birol Yüce
- Department of Internal Medicine II, Ludwig Maximilians University Munich, Munich, Germany
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36
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Myslinski E, Gérard MA, Krol A, Carbon P. Transcription of the human cell cycle regulated BUB1B gene requires hStaf/ZNF143. Nucleic Acids Res 2007; 35:3453-64. [PMID: 17478512 PMCID: PMC1904299 DOI: 10.1093/nar/gkm239] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
BubR1 is a key protein mediating spindle checkpoint activation. Loss of this checkpoint control results in chromosomal instability and aneuploidy. The transcriptional regulation of the cell cycle regulated human BUB1B gene, which encodes BubR1, was investigated in this report. A minimal BUB1B gene promoter containing 464 bp upstream from the translation initiation codon was sufficient for cell cycle regulated promoter activity. A pivotal role for transcription factor hStaf/ZNF143 in the expression of the BUB1B gene was demonstrated through gel retardation assays, transient expression of mutant BUB1B promoter–reporter gene constructs and chromatin immunoprecipitation assay. Two phylogenetically conserved hStaf/ZNF143-binding sites (SBS) were identified which are indispensable for BUB1B promoter activity. In addition, we found that the domain covering the transcription start sites contains conserved boxes homologous to initiator (Inr), cell cycle dependent (CDE) and cell cycle genes homology regions (CHR) elements. Mutations within the CDE and CHR elements led to diminished cell cycle regulation of BUB1B transcription. These results demonstrate that BUB1B gene transcription is positively regulated by hStaf/ZNF143, a ubiquitously expressed factor, and that the CDE-CHR tandem element was essential for G2/M-specific transcription of the BUB1B gene.
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Affiliation(s)
| | | | | | - Philippe Carbon
- *To whom correspondence should be addressed. Tel: +33 3 88 41 70 64; Fax: +33 3 88 60 22 18;
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37
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Galimberti D, Scarpini E, Venturelli E, Strobel A, Herterich S, Fenoglio C, Guidi I, Scalabrini D, Cortini F, Bresolin N, Lesch KP, Reif A. Association of a NOS1 promoter repeat with Alzheimer's disease. Neurobiol Aging 2007; 29:1359-65. [PMID: 17418914 DOI: 10.1016/j.neurobiolaging.2007.03.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2006] [Revised: 02/16/2007] [Accepted: 03/04/2007] [Indexed: 01/02/2023]
Abstract
The gene encoding NOS-I (NOS1) displays a complex transcriptional regulation, with nine alternative first exons. Exon 1c and 1f are the most abundant forms in the brain. A functional single nucleotide polymorphism (SNP) in exon 1c and a polymorphism in exon 1f, consisting of a variable number of tandem repeats (VNTR) originating short (S) and long (L) alleles, were studied in 184 patients with Alzheimer's disease (AD) and 144 gender- and age-matched controls. No differences were found for the Ex1c G-84A. The Ex1f-VNTR S allele was significantly more common in AD (55% versus 44%, P=0.009, OR=1.52) as was the S/S genotype (28% versus 14%, P=0.008; OR=2.37). The S allele showed a highly significant interaction with the ApoE epsilon 4 allele (OR: 10.83). Therefore, short alleles of the NOS1 exon 1f-VNTR are likely to be susceptibility factors for AD, and interact with the epsilon 4 allele to markedly increase the AD risk.
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Affiliation(s)
- Daniela Galimberti
- Department of Neurological Sciences, Dino Ferrari Center, University of Milan, Fondazione Ospedale Maggiore Policlinico IRCCS, Milan, Italy.
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38
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Li Y, Li G, Li C, Zhao Y. Identification of nuclear factor-kappaB responsive element within the neuronal nitric oxide synthase exon 1f-specific promoter. Acta Biochim Biophys Sin (Shanghai) 2007; 39:247-54. [PMID: 17417679 DOI: 10.1111/j.1745-7270.2007.00280.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Transcriptional regulation of the neuronal nitric oxide synthase gene (nNOS) is particularly complex as 12 distinct transcripts derived from different first exons are expressed in a tissue- and cell-specific manner. The exon 1f mRNA is relatively highly expressed in nervous system and relies upon exon 1f-specific promoter activity. Using conventional and real-time reverse transcription-polymerase chain reaction, we found exon 1f mRNA was the major transcript of the nNOS gene in human neuroblastoma SK-N-SH cells. We analyzed a 1090 bp fragment of 1f promoter by TRANSFAC-TESS and Match softwares and luciferase assay, and found an important positive transcriptional regulation region that contained a putative nuclear factor (NF)-kappaB binding site. Subsequently, using electrophoresis mobility shift and chromatin immunoprecipitation assays, we identified this site to be the NF-kappaB responsive element, a crucial positive regulator in the activation of the nNOS 1f promoter. Taken together, our study identified an NF-kappaB responsive element within nNOS 1f promoter and showed that it plays an important role in the transactivation of nNOS 1f mRNA, the major transcript of nNOS in SK-N-SH cells.
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Affiliation(s)
- Yinghui Li
- Department of Medical Genetics, China Medical University, Shenyang 110001, China
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39
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Lindås AC, Tomkinson B. Characterization of the promoter of the gene encoding human tripeptidyl-peptidase II and identification of upstream silencer elements. Gene 2007; 393:62-9. [PMID: 17343995 DOI: 10.1016/j.gene.2007.01.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2006] [Revised: 01/17/2007] [Accepted: 01/17/2007] [Indexed: 12/16/2022]
Abstract
Tripeptidyl-peptidase II (TPP II) is one of the many proteases involved in the important process of intracellular proteolysis. The widespread distribution and broad substrate specificity suggest that TPP II is encoded by a "house-keeping gene". However, both TPP II protein and mRNA levels vary in different cells. To investigate whether these variations are due to regulation on a genetic level, the promoter of the TPP2 gene has previously been identified. The promoter contains two inverted CCAAT-boxes and an E-box. By means of reporter assays and electrophoretic mobility shift assays the promoter has now been further characterized. It could be concluded that USF-1 (upstream stimulatory factor-1) binds to the E-box in the promoter. The transcription factors NF-Y and USF-1 are present in protein-DNA complexes of different sizes. Mutation of the E-box had no effect, indicating that only binding of NF-Y to the two CCAAT-boxes was important for activation of transcription. However, this does not exclude the possibility that USF-1 can play an important role in transcription in other types of cells. Furthermore, the region upstream of the promoter was investigated due to its ability to inhibit transcription. Several silencer elements were identified and we also showed that Oct-1 binds to one of these elements. Thus, this investigation reveals that TPP II expression could be regulated through both positive and negative regulatory elements. Further studies are required to establish the involvement of different genetic elements, and how the interplay between different transcription factors will affect the transcriptional rate in vivo.
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Affiliation(s)
- Ann-Christin Lindås
- Uppsala University, Biomedical Center, Department of Biochemistry and Organic Chemistry, Uppsala, Sweden
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40
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Chan JYH, Cheng HL, Chou JLJ, Li FCH, Dai KY, Chan SHH, Chang AYW. Heat Shock Protein 60 or 70 Activates Nitric-oxide Synthase (NOS) I- and Inhibits NOS II-associated Signaling and Depresses the Mitochondrial Apoptotic Cascade during Brain Stem Death. J Biol Chem 2007; 282:4585-4600. [PMID: 17150954 DOI: 10.1074/jbc.m603394200] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The cellular and molecular basis of brain stem death remains an enigma. As the origin of a "life-and-death" signal that reflects the progression toward brain stem death, the rostral ventrolateral medulla (RVLM) is a suitable neural substrate for mechanistic delineation of this phenomenon. Here, we evaluated the hypothesis that heat shock proteins (HSPs) play a neuroprotective role in the RVLM during brain stem death and delineated the underlying mechanisms, using a clinically relevant animal model that employed the organophosphate pesticide mevinphos (Mev) as the experimental insult. In Sprague-Dawley rats, proteomic, Western blot, and real-time PCR analyses demonstrated that Mev induced de novo synthesis of HSP60 or HSP70 in the RVLM without affecting HSP90 level. Loss-of-function manipulations of HSP60 or HSP70 in the RVLM using anti-serum or antisense oligonucleotide potentiated Mev-elicited cardiovascular depression alongside reduced nitric-oxide synthase (NOS) I/protein kinase G signaling, enhanced NOS II/peroxynitrite cascade, intensified nucleosomal DNA fragmentation, elevated cytoplasmic histone-associated DNA fragments or activated caspase-3, and augmented the cytochrome c/caspase-3 cascade of apoptotic signaling in the RVLM. Co-immunoprecipitation experiments further revealed a progressive increase in the complex formed between HSP60 and mitochondrial or cytosolic Bax or mitochondrial Bcl-2 during Mev intoxication, alongside a dissociation of the cytosolic HSP60-Bcl-2 complex. We conclude that HSP60 and HSP70 confer neuroprotection against Mev intoxication by ameliorating cardiovascular depression via an anti-apoptotic action in the RVLM. The possible underlying intracellular processes include enhancing NOS I/protein kinase G signaling and inhibiting the NOS II/peroxynitrite cascade. In addition, HSP60 exerts its effects against apoptosis by blunting Mev-induced activation of the Bax/cytochrome c/caspase-3 cascade.
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Affiliation(s)
- Julie Y H Chan
- Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung 81346
| | - Hsiao-Lei Cheng
- Center for Neuroscience, National Sun Yat-sen University, Kaohsiung 80424, and the
| | - Jimmy L J Chou
- Center for Neuroscience, National Sun Yat-sen University, Kaohsiung 80424, and the
| | - Faith C H Li
- Center for Neuroscience, National Sun Yat-sen University, Kaohsiung 80424, and the
| | - Kuang-Yu Dai
- Center for Neuroscience, National Sun Yat-sen University, Kaohsiung 80424, and the
| | - Samuel H H Chan
- Center for Neuroscience, National Sun Yat-sen University, Kaohsiung 80424, and the; Center for Gene Regulation and Signal Transduction Research, National Cheng Kung University, Tainan 70101, Taiwan
| | - Alice Y W Chang
- Center for Neuroscience, National Sun Yat-sen University, Kaohsiung 80424, and the; Center for Gene Regulation and Signal Transduction Research, National Cheng Kung University, Tainan 70101, Taiwan.
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41
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Li Y, Zhao Y, Li G, Wang J, Li T, Li W, Lu J. Regulation of neuronal nitric oxide synthase exon 1f gene expression by nuclear factor-kappaB acetylation in human neuroblastoma cells. J Neurochem 2007; 101:1194-204. [PMID: 17250678 DOI: 10.1111/j.1471-4159.2006.04407.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The neuronal nitric oxide synthase (nNOS) is predominantly expressed in nervous tissues and subject to complex transcriptional controls. To determine the effect of acetylation on nNOS expression, human neuroblastoma SK-N-SH cells were treated with trichostatin A (TSA), a histone deacetylase inhibitor. As a consequence, total and exon 1f-specific nNOS mRNA, nNOS protein and nNOS-derived nitric oxide production were increased. Immunoprecipitation and western blot showed both nuclear factor-kappaB (NF-kappaB) subunits p65 and p50 were acetylated in the presence of TSA. The enhancement of the p65 and p50 acetylation was in accordance with their increased binding affinities to the NF-kappaB responsive element, which was identified at position -893 to -884 of the nNOS exon 1f promoter. Luciferase assays revealed that TSA up-regulated the transcriptional activity of the nNOS 1f promoter through NF-kappaB-mediated transactivation. Taken together, we demonstrate that acetylation plays a crucial role in nNOS expression and suggest that acetylation of NF-kappaB p65 and p50 subunits by TSA treatment may augment their DNA-binding affinities, thereby activating the nNOS exon 1f promoter. It may be one of the mechanisms by which acetylation modulates nNOS expression and nitric oxide output in SK-N-SH cells and may be the molecular basis for certain neurological disorders.
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Affiliation(s)
- Yinghui Li
- Department of Medical Genetics, China Medical University, Shenyang, China
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42
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Myslinski E, Gérard MA, Krol A, Carbon P. A Genome Scale Location Analysis of Human Staf/ZNF143-binding Sites Suggests a Widespread Role for Human Staf/ZNF143 in Mammalian Promoters. J Biol Chem 2006; 281:39953-62. [PMID: 17092945 DOI: 10.1074/jbc.m608507200] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Staf was originally identified as the transcriptional activator of Xenopus tRNA(Sec) and small nuclear (sn) RNA-type genes. Recently, transcription of seven human (h) protein coding genes was reported to be activated by the human ortholog hStaf/ZNF143. Here we have used a combined in silico and biochemical approach to identify 1175 conserved hStaf/ZNF143-binding sites (SBS) distributed in 938 promoters of four mammalian genomes. The SBS shows a significant positional preference and occurs mostly within 200 bp upstream of the transcription start site. Chromatin immunoprecipitation assays with 295 of the promoters established that 90% contain bona fide SBS. By extrapolating the values of this mapping to the full sizes of the mammalian genomes, we can infer the existence of at least 2500 SBS distributed in 2000 promoters. This unexpected large number strongly suggests that SBS constitutes one of the most widespread transcription factor-binding sites in mammalian promoters. Furthermore, we demonstrated that the presence of the SBS alone is sufficient to direct expression of a luciferase reporter gene, suggesting that hStaf/ZNF143 can recruit per se the transcription machinery.
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Affiliation(s)
- Evelyne Myslinski
- Institut de Biologie Moléculaire et Cellulaire, UPR CNRS Architecture et Réactivité de l'ARN, Université Louis Pasteur, 15 Rue René Descartes, 67084 Strasbourg Cedex, France
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43
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Bros M, Boissel JP, Gödtel-Armbrust U, Förstermann U. Transcription of human neuronal nitric oxide synthase mRNAs derived from different first exons is partly controlled by exon 1-specific promoter sequences. Genomics 2006; 87:463-73. [PMID: 16413742 DOI: 10.1016/j.ygeno.2005.11.013] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2005] [Revised: 10/24/2005] [Accepted: 11/24/2005] [Indexed: 10/25/2022]
Abstract
The human neuronal nitric oxide synthase (NOS1) gene is subject to extensive splicing. A total of 12 NOS1 mRNA species have been identified. They differ in their 5' ends and are derived from 12 different first exons (termed exons 1a to 1l). Various cell lines whose NOS1 first exon expression patterns were representative of human brain, skin, and skeletal muscle were identified. These included A673 neuroepithelioma cells, SK-N-MC neuroblastoma cells, HaCaT keratinocyte-like cells, and C2C12 myocyte-like cells. In these cell lines, correlations were found between the exon 1 variants preferentially expressed and the promoter activities of their cognate 5' flanking sequences. These data demonstrate that expression of the different exon 1-related splice variants of NOS1 mRNA is controlled directly (at least in part) by the associated 5' flanking sequences.
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Affiliation(s)
- Matthias Bros
- Department of Dermatology, Johannes Gutenberg University, D-55101 Mainz, Germany
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44
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Reif A, Herterich S, Strobel A, Ehlis AC, Saur D, Jacob CP, Wienker T, Töpner T, Fritzen S, Walter U, Schmitt A, Fallgatter AJ, Lesch KP. A neuronal nitric oxide synthase (NOS-I) haplotype associated with schizophrenia modifies prefrontal cortex function. Mol Psychiatry 2006; 11:286-300. [PMID: 16389274 DOI: 10.1038/sj.mp.4001779] [Citation(s) in RCA: 169] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Nitric oxide (NO) is a gaseous neurotransmitter thought to play important roles in several behavioral domains. On a neurobiological level, NO acts as the second messenger of the N-methyl-D-aspartate receptor and interacts with both the dopaminergic as well as the serotonergic system. Thus, NO is a promising candidate molecule in the pathogenesis of endogenous psychoses and a potential target in their treatment. Furthermore, the chromosomal locus of the gene for the NO-producing enzyme NOS-I, 12q24.2, represents a major linkage hot spot for schizophrenic and bipolar disorder. To investigate whether the gene encoding NOS-I (NOS1) conveys to the genetic risk for those diseases, five NOS1 polymorphisms as well as a NOS1 mini-haplotype, consisting of two functional polymorphisms located in the transcriptional control region of NOS1, were examined in 195 chronic schizophrenic, 72 bipolar-I patients and 286 controls. Single-marker association analysis showed that the exon 1c promoter polymorphism was linked to schizophrenia (SCZ), whereas synonymous coding region polymorphisms were not associated with disease. Long promoter alleles of the repeat polymorphism were associated with less severe psychopathology. Analysis of the mini-haplotype also revealed a significant association with SCZ. Mutational screening did not detect novel exonic polymorphisms in patients, suggesting that regulatory rather than coding variants convey the genetic risk on psychosis. Finally, promoter polymorphisms impacted on prefrontal functioning as assessed by neuropsychological testing and electrophysiological parameters elicited by a Go-Nogo paradigm in 48 patients (continuous performance test). Collectively these findings suggest that regulatory polymorphisms of NOS1 contribute to the genetic risk for SCZ, and modulate prefrontal brain functioning.
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Affiliation(s)
- A Reif
- Department of Psychiatry and Psychotherapy (Section for Clinical and Molecular Psychobiology and Laboratory for Psychophysiology and Functional Imaging), Julius-Maximilians-University Würzburg, Würzburg, Germany.
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45
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Ward ME, Toporsian M, Scott JA, Teoh H, Govindaraju V, Quan A, Wener AD, Wang G, Bevan SC, Newton DC, Marsden PA. Hypoxia induces a functionally significant and translationally efficient neuronal NO synthase mRNA variant. J Clin Invest 2006; 115:3128-39. [PMID: 16276418 PMCID: PMC1265848 DOI: 10.1172/jci20806] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2003] [Accepted: 08/30/2005] [Indexed: 11/17/2022] Open
Abstract
We tested the hypothesis that induction of neuronal NO synthase (nNOS) impairs vascular smooth muscle contractility after hypoxia. nNOS protein was increased in aorta, mesenteric arterioles, pulmonary arteries, brain, and diaphragm from rats exposed to 8% O2 for 48 hours and in human aortic SMCs after hypoxic incubation (1% O2). Ca-dependent NO synthase activity was increased in endothelium-denuded aortic segments from hypoxia-exposed rats. N-nitro-L-arginine methyl ester enhanced the contractile responses of endothelium-denuded aortic rings and mesenteric arterioles from hypoxia-exposed but not normoxic rats (P < 0.05). The hypoxia-inducible mRNA transcript expressed by human cells was found to contain a novel 5'-untranslated region, consistent with activation of transcription in the genomic region contiguous with exon 2. Translational efficiency of this transcript is markedly increased compared with previously described human nNOS mRNAs. Transgenic mice possessing a lacZ reporter construct under control of these genomic sequences demonstrated expression of the construct after exposure to hypoxia (8% O2, 48 hours) in the aorta, mesenteric arterioles, renal papilla, and brain. These results reveal a novel human nNOS promoter that confers the ability to rapidly upregulate nNOS expression in response to hypoxia with a functionally significant effect on vascular smooth muscle contraction.
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Affiliation(s)
- Michael E Ward
- Division of Respirology, University of Toronto, Toronto, Ontario, Canada.
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46
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Zheng G, Yang YC. Acetylation and alternative splicing regulate ZNF76-mediated transcription. Biochem Biophys Res Commun 2005; 339:1069-75. [PMID: 16337145 DOI: 10.1016/j.bbrc.2005.11.122] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2005] [Accepted: 11/17/2005] [Indexed: 11/17/2022]
Abstract
We previously showed that ZNF76 is a general transcription repressor targeting TATA-binding protein (TBP), through a process regulated by sumoylation [G. Zheng, Y.C. Yang, ZNF76, a novel transcriptional repressor targeting TATA-binding protein, is modulated by sumoylation, J. Biol. Chem. 279 (2004) 42410-42421]. In this study, two additional regulatory mechanisms for ZNF76 were identified. ZNF76 is acetylated by p300 and deacetylated by HDAC1, and acetylation of ZNF76 leads to its loss of sumoylation and attenuation of TBP interaction. Consistent with their physical antagonism, acetylation, and sumoylation play opposite roles in regulating the transactivation of ZNF76. Besides acetylation and sumoylation, ZNF76 is also regulated through mRNA splicing: two isoforms of ZNF76 have different abilities of interacting with TBP. Our study shows that ZNF76, a TBP-interacting transcriptional modulator, is regulated by both lysine modifications and alternative splicing.
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Affiliation(s)
- Gang Zheng
- Department of Pharmacology and Cancer Center, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA
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47
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Chan JYH, Chang AYW, Chan SHH. New insights on brain stem death: From bedside to bench. Prog Neurobiol 2005; 77:396-425. [PMID: 16376477 DOI: 10.1016/j.pneurobio.2005.11.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2005] [Revised: 10/31/2005] [Accepted: 11/03/2005] [Indexed: 01/07/2023]
Abstract
As much as brain stem death is currently the clinical definition of death in many countries and is a phenomenon of paramount medical importance, there is a dearth of information on its mechanistic underpinnings. A majority of the clinical studies are concerned only with methods to determine brain stem death. Whereas a vast amount of information is available on the cellular and molecular mechanisms of cell death, rarely are these studies directed specifically towards the understanding of brain stem death. This review presents a framework for translational research on brain stem death that is based on systematically coordinated clinical and laboratory efforts that center on this phenomenon. It begins with the identification of a novel clinical marker from patients that is related specifically to brain stem death. After realizing that this "life-and-death" signal is related to the functional integrity of the brain stem, its origin is traced to the rostral ventrolateral medulla (RVLM). Subsequent laboratory studies on this neural substrate in animal models of brain stem death provide credence to the notion that both "pro-life" and "pro-death" programs are at work during the progression towards death. Those programs (mitochondrial functions, nitric oxide, peroxynitrite, superoxide anion, coenzyme Q10, heat shock proteins and ubiquitin-proteasome system) hitherto identified from the RVLM are presented, along with their cellular and molecular mechanisms. It is proposed that outcome of the interplay between the "pro-life" and "pro-death" programs (dying) in this neural substrate determines the final fate of the individual (being dead). Thus, identification of additional programs in the RVLM and delineation of their regulatory mechanisms should shed new lights on future directions for clinical management of life-and-death.
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Affiliation(s)
- Julie Y H Chan
- Department of Medical Education and Research, Kaohsiung Veterans General Hospital, Kaohsiung 81346, Taiwan, ROC
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48
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Saur D, Seidler B, Schneider G, Algül H, Beck R, Senekowitsch-Schmidtke R, Schwaiger M, Schmid RM. CXCR4 expression increases liver and lung metastasis in a mouse model of pancreatic cancer. Gastroenterology 2005; 129:1237-50. [PMID: 16230077 DOI: 10.1053/j.gastro.2005.06.056] [Citation(s) in RCA: 150] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2005] [Accepted: 06/16/2005] [Indexed: 12/02/2022]
Abstract
BACKGROUND & AIMS Expression of the Gi-protein-coupled chemokine receptor CXCR4 has recently been linked to increased proliferation, invasion, and migration of human pancreatic cancer cell lines. However, the relevance of CXCR4 for organ-specific pancreatic cancer metastasis in vivo remains unclear. Here, we have studied the role of CXCR4 in vivo using noninvasive imaging of targeted metastasis in a mouse model of pancreatic cancer. METHODS Functional expression of the chemokine receptors CXCR4 and CCR7 was achieved by stable transfection of murine TD-2 pancreatic cancer cells and analyzed by flow cytometry, calcium flux, migration, and proliferation assays. The metastatic potential of the different stable TD-2 cell clones was assessed by tail vein metastatic assays in nude mice using in vivo bioluminescent imaging. RESULTS Native TD-2 cells display very low abundant CXCR4 and CCR7 expression and show poor metastatic potential after tail vein injection. To study the role of CXCR4 in pancreatic cancer metastasis, we selected stable TD-2 cell clones with similar CXCR4 expression levels as human pancreatic cancer cell lines derived from metastatic lesions. CXCR4, but not CCR7, expression dramatically increased the in vivo metastatic potential of TD-2 cells, resulting in liver and lung metastasis in nude mice. Systemic administration of the selective CXCR4 inhibitor AMD 3100 effectively blocked the enhanced metastatic potential of CXCR4-expressing pancreatic cancer cells. CONCLUSIONS These results indicate that CXCR4 expression mediates organ-specific metastasis of pancreatic cancer cells and provide preclinical evidence that blockade of the CXCL12/CXCR4 axis is a target for antimetastatic therapy.
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Affiliation(s)
- Dieter Saur
- Department of Internal Medicine 2, Technical University of Munich, Germany.
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49
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Li FCH, Chan JYH, Chan SHH, Chang AYW. In the Rostral Ventrolateral Medulla, the 70-kDa Heat Shock Protein (HSP70), but Not HSP90, Confers Neuroprotection against Fatal Endotoxemia via Augmentation of Nitric-Oxide Synthase I (NOS I)/Protein Kinase G Signaling Pathway and Inhibition of NOS II/Peroxynitrite Cascade. Mol Pharmacol 2005; 68:179-92. [PMID: 15827295 DOI: 10.1124/mol.105.011684] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Heat shock proteins (HSPs) represent a group of highly conserved intracellular proteins that participate in protective adaptation against cellular stress. We evaluated the neuroprotective role of the 70-kDa HSP (HSP70) and the 90-kDa HSP (HSP90) at the rostral ventrolateral medulla (RVLM), the medullary origin of sympathetic vasomotor tone, during fatal endotoxemia. In Sprague-Dawley rats maintained under propofol anesthesia, Escherichia coli lipopolysaccharide (30 mg/kg, i.v.) induced a decrease (phase I), followed by an increase (phase II; "pro-life" phase) and a secondary decrease (phase III; "pro-death" phase) in the power density of the vasomotor component of systemic arterial pressure spectrum, along with progressive hypotension or bradycardia. Proteomic and Western blot analyses revealed that whereas HSP70 expression in the RVLM was significantly augmented during phases I and II and returned to baseline during phase III endotoxemia, HSP90 protein expression remained constant. The increase in HSP70 level was significantly blunted on pretreatment with microinjection of the transcription inhibitor actinomycin D or protein synthesis inhibitor cycloheximide into the bilateral RVLM. Functional blockade of HSP70 in the RVLM by an anti-HSP70 antiserum or prevention of synthesis by an antisense hsp70 oligonucleotide exacerbated mortality or potentiated the cardiovascular depression during experimental endotoxemia, alongside significantly reduced nitric-oxide synthase (NOS) I or protein kinase G (PKG) level or augmented NOS II or peroxynitrite level in the RVLM. We conclude that whereas HSP90 is ineffective, de novo synthesis of HSP70 in the RVLM may confer neuroprotection during fatal endotoxemia by preventing cardiovascular depression via enhancing the sympathoexcitatory NOS I/PKG signaling pathway and inhibiting the sympathoinhibitory NOS II/peroxynitrite cascade in the RVLM.
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Affiliation(s)
- Faith C H Li
- Center for Neuroscience and Department of Biological Science, National Sun Yat-sen University, Kaohsiung, Taiwan, Republic of China
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50
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Lindås AC, Tomkinson B. Identification and characterization of the promoter for the gene encoding human tripeptidyl-peptidase II. Gene 2005; 345:249-57. [PMID: 15716107 DOI: 10.1016/j.gene.2004.11.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2004] [Revised: 10/26/2004] [Accepted: 11/24/2004] [Indexed: 11/22/2022]
Abstract
Tripeptidyl-peptidase II (TPP II) is a ubiquitously expressed exopeptidase. The expression of this enzyme is increased, e.g. in some tumor cells, but the regulation of the expression of the gene has not been investigated previously. The gene encoding human TPP II (TPP2) is 82 kb and consists of 30 exons. An 8 kb NcoI fragment covering the 5'-flanking region of the TPP2 gene, including the initiation codon, was cloned into a luciferase-containing reporter vector. Human embryonic kidney cells (HEK-293 cells) and murine fibroblasts (NIH3T3 cells) were transiently transfected with the construct. Through sequential deletions and analysis of short PCR-fragments, the promoter could be localized to a 215 bp fragment upstream of the initiation codon. This region is GC-rich, lacks a TATA-box and contains two inverted CCAAT-boxes and a GC-box. Electrophoretic mobility shift assays showed that nuclear proteins bind to the promoter fragment. The 85 bp 5'-end of the promoter fragment is essential for transcriptional activation. Out of this a 44 bp fragment suffices to compete with binding of nuclear proteins to the 215 bp fragment. Supershift assays demonstrated that the CCAAT-binding factor (CBF; NF-Y) is involved in the formation of a complex with the 215 bp fragment. Although Sp1 binds to the promoter fragment in vitro, it was found to bind to the 3'-end of the 215 bp fragment which is not essential for transcription. The potential role of Sp1 in transcription of TPP2 therefore remains to be established.
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Affiliation(s)
- Ann-Christin Lindås
- Uppsala University, BMC, Department of Biochemistry, Box 576, SE-751 23 Uppsala, Sweden
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