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Grinchenko A, Buriak I, Kumeiko V. Invertebrate C1q Domain-Containing Proteins: Molecular Structure, Functional Properties and Biomedical Potential. Mar Drugs 2023; 21:570. [PMID: 37999394 PMCID: PMC10672478 DOI: 10.3390/md21110570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 10/23/2023] [Accepted: 10/28/2023] [Indexed: 11/25/2023] Open
Abstract
C1q domain-containing proteins (C1qDC proteins) unexpectedly turned out to be widespread molecules among a variety of invertebrates, despite their lack of an integral complement system. Despite the wide distribution in the genomes of various invertebrates, data on the structure and properties of the isolated and characterized C1qDC proteins, which belong to the C1q/TNF superfamily, are sporadic, although they hold great practical potential for the creation of new biotechnologies. This review not only summarizes the current data on the properties of already-isolated or bioengineered C1qDC proteins but also projects further strategies for their study and biomedical application. It has been shown that further broad study of the carbohydrate specificity of the proteins can provide great opportunities, since for many of them only interactions with pathogen-associated molecular patterns (PAMPs) was evaluated and their antimicrobial, antiviral, and fungicidal activities were studied. However, data on the properties of C1qDC proteins, which researchers originally discovered as lectins and therefore studied their fine carbohydrate specificity and antitumor activity, intriguingly show the great potential of this family of proteins for the creation of targeted drug delivery systems, vaccines, and clinical assays for the differential diagnosis of cancer. The ability of invertebrate C1qDC proteins to recognize patterns of aberrant glycosylation of human cell surfaces and interact with mammalian immunoglobulins indicates the great biomedical potential of these molecules.
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Affiliation(s)
- Andrei Grinchenko
- School of Medicine and Life Sciences, Far Eastern Federal University, 690922 Vladivostok, Russia; (A.G.); (I.B.)
- A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, 690041 Vladivostok, Russia
| | - Ivan Buriak
- School of Medicine and Life Sciences, Far Eastern Federal University, 690922 Vladivostok, Russia; (A.G.); (I.B.)
- A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, 690041 Vladivostok, Russia
| | - Vadim Kumeiko
- School of Medicine and Life Sciences, Far Eastern Federal University, 690922 Vladivostok, Russia; (A.G.); (I.B.)
- A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, 690041 Vladivostok, Russia
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Nguyen DH, Duque V, Phillips N, Mecawi AS, Cunningham JT. Spatial transcriptomics reveal basal sex differences in supraoptic nucleus gene expression of adult rats related to cell signaling and ribosomal pathways. Biol Sex Differ 2023; 14:71. [PMID: 37858270 PMCID: PMC10585758 DOI: 10.1186/s13293-023-00554-3] [Citation(s) in RCA: 1] [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: 05/26/2023] [Accepted: 09/25/2023] [Indexed: 10/21/2023] Open
Abstract
BACKGROUND The supraoptic nucleus (SON) of the hypothalamus contains magnocellular neurosecretory cells that secrete the hormones vasopressin and oxytocin. Sex differences in SON gene expression have been relatively unexplored. Our study used spatially resolved transcriptomics to visualize gene expression profiles in the SON of adult male (n = 4) and female (n = 4) Sprague-Dawley rats using Visium Spatial Gene Expression (10x Genomics). METHODS Briefly, 10-μm coronal sections (~ 4 × 4 mm) containing the SON were collected from each rat and processed using Visium slides and recommended protocols. Data were analyzed using 10x Genomics' Space Ranger and Loupe Browser applications and other bioinformatic tools. Two unique differential expression (DE) analysis methods, Loupe Browser and DESeq2, were used. RESULTS Loupe Browser DE analysis of the SON identified 116 significant differentially expressed genes (DEGs) common to both sexes (e.g., Avp and Oxt), 31 significant DEGs unique to the males, and 73 significant DEGs unique to the females. DESeq2 analysis revealed 183 significant DEGs between the two groups. Gene Ontology (GO) enrichment and pathway analyses using significant genes identified via Loupe Browser revealed GO terms and pathways related to (1) neurohypophyseal hormone activity, regulation of peptide hormone secretion, and regulation of ion transport for the significant genes common to both males and females, (2) Gi signaling/G-protein mediated events for the significant genes unique to males, and (3) potassium ion transport/voltage-gated potassium channels for the significant genes unique to females, as some examples. GO/pathway analyses using significant genes identified via DESeq2 comparing female vs. male groups revealed GO terms/pathways related to ribosomal structure/function. Ingenuity Pathway Analysis (IPA) identified additional sex differences in canonical pathways (e.g., 'Mitochondrial Dysfunction', 'Oxidative Phosphorylation') and upstream regulators (e.g., CSF3, NFKB complex, TNF, GRIN3A). CONCLUSION There was little overlap in the IPA results for the two different DE methods. These results suggest sex differences in SON gene expression that are associated with cell signaling and ribosomal pathways.
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Affiliation(s)
- Dianna H Nguyen
- Department of Physiology and Anatomy, School of Biomedical Sciences, UNT Health Science Center, Fort Worth, TX, USA
- Texas College of Osteopathic Medicine, UNT Health Science Center, Fort Worth, TX, USA
| | - Victor Duque
- Department of Biophysics, Laboratory of Molecular Neuroendocrinology, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil
| | - Nicole Phillips
- Department of Microbiology, Immunology, and Genetics, School of Biomedical Sciences, UNT Health Science Center, Fort Worth, TX, USA
| | - André Souza Mecawi
- Department of Biophysics, Laboratory of Molecular Neuroendocrinology, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil
| | - J Thomas Cunningham
- Department of Physiology and Anatomy, School of Biomedical Sciences, UNT Health Science Center, Fort Worth, TX, USA.
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Qiu L, Zhou R, Zhou L, Yang S, Wu J. CAPRIN2 upregulation by LINC00941 promotes nasopharyngeal carcinoma ferroptosis resistance and metastatic colonization through HMGCR. Front Oncol 2022; 12:931749. [PMID: 36276162 PMCID: PMC9582274 DOI: 10.3389/fonc.2022.931749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 09/21/2022] [Indexed: 12/24/2022] Open
Abstract
Distant metastasis is the main cause of death in nasopharyngeal carcinoma (NPC) patients. There is an urgent need to reveal the underlying mechanism of NPC metastasis and identify novel therapeutic targets. The ferroptosis resistance and survival ability of extracellular matrix (ECM)-detached tumor cells are important factors in determining the success of distant metastasis. In this study, we found that CAPRIN2 contributes to the ferroptosis resistance and survival of ECM-detached NPC cells. Moreover, CAPRIN2 serves as a positive regulator of NPC cell migration and invasion. HMGCR, the key metabolic enzyme of the mevalonate pathway, was identified as the key downstream molecule of CAPRIN2, which mediates its regulation of ferroptosis, survival, migration and invasion of NPC cells. Lung colonization experiments showed that downregulation of the CAPRIN2/HMGCR axis resulted in reduced lung metastasis of NPC cells. Erastin treatment inhibited the ability of NPC cells to colonize the lungs, which was further enhanced by CAPRIN2/HMGCR axis downregulation. Regulated by upstream LINC00941, CAPRIN2 is abnormally activated in NPC, and its high expression is associated with a poor prognosis. In conclusion, CAPRIN2 is a molecular marker of a poor prognosis in NPC, and the LINC00941/CAPRIN2/HMGCR axis provides a new target for the treatment of NPC metastasis and ferroptosis resistance.
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Affiliation(s)
- Lin Qiu
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China
- Guangzhou Women and Children’s Medical Center, Department of Hematology and Oncology, Guangzhou Medical University, Guangzhou, China
| | - Rui Zhou
- Department of General Surgery, The Third Affiliated Hospital of Southern Medical University, Guangzhou, China
| | - Ling Zhou
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Shiping Yang
- Department of Radiation Oncology, Hainan Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Jiangxue Wu
- State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China
- *Correspondence: Jiangxue Wu,
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Duran-Arqué B, Cañete M, Castellazzi CL, Bartomeu A, Ferrer-Caelles A, Reina O, Caballé A, Gay M, Arauz-Garofalo G, Belloc E, Mendez R. Comparative analyses of vertebrate CPEB proteins define two subfamilies with coordinated yet distinct functions in post-transcriptional gene regulation. Genome Biol 2022; 23:192. [PMID: 36096799 PMCID: PMC9465852 DOI: 10.1186/s13059-022-02759-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Accepted: 08/12/2022] [Indexed: 12/31/2022] Open
Abstract
Background Vertebrate CPEB proteins bind mRNAs at cytoplasmic polyadenylation elements (CPEs) in their 3′ UTRs, leading to cytoplasmic changes in their poly(A) tail lengths; this can promote translational repression or activation of the mRNA. However, neither the regulation nor the mechanisms of action of the CPEB family per se have been systematically addressed to date. Results Based on a comparative analysis of the four vertebrate CPEBs, we determine their differential regulation by phosphorylation, the composition and properties of their supramolecular assemblies, and their target mRNAs. We show that all four CPEBs are able to recruit the CCR4-NOT deadenylation complex to repress the translation. However, their regulation, mechanism of action, and target mRNAs define two subfamilies. Thus, CPEB1 forms ribonucleoprotein complexes that are remodeled upon a single phosphorylation event and are associated with mRNAs containing canonical CPEs. CPEB2–4 are regulated by multiple proline-directed phosphorylations that control their liquid–liquid phase separation. CPEB2–4 mRNA targets include CPEB1-bound transcripts, with canonical CPEs, but also a specific subset of mRNAs with non-canonical CPEs. Conclusions Altogether, these results show how, globally, the CPEB family of proteins is able to integrate cellular cues to generate a fine-tuned adaptive response in gene expression regulation through the coordinated actions of all four members. Supplementary Information The online version contains supplementary material available at 10.1186/s13059-022-02759-y.
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Affiliation(s)
- Berta Duran-Arqué
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Manuel Cañete
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Chiara Lara Castellazzi
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Anna Bartomeu
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Anna Ferrer-Caelles
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Oscar Reina
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Adrià Caballé
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Marina Gay
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Gianluca Arauz-Garofalo
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Eulalia Belloc
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain
| | - Raúl Mendez
- Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology, 08028, Barcelona, Spain. .,Institució Catalana de Recerca I Estudis Avançats (ICREA), 08010, Barcelona, Spain.
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Mecawi AS, Varanda WA, da Silva MP. Osmoregulation and the Hypothalamic Supraoptic Nucleus: From Genes to Functions. Front Physiol 2022; 13:887779. [PMID: 35685279 PMCID: PMC9171026 DOI: 10.3389/fphys.2022.887779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 04/18/2022] [Indexed: 11/13/2022] Open
Abstract
Due to the relatively high permeability to water of the plasma membrane, water tends to equilibrate its chemical potential gradient between the intra and extracellular compartments. Because of this, changes in osmolality of the extracellular fluid are accompanied by changes in the cell volume. Therefore, osmoregulatory mechanisms have evolved to keep the tonicity of the extracellular compartment within strict limits. This review focuses on the following aspects of osmoregulation: 1) the general problems in adjusting the "milieu interieur" to challenges imposed by water imbalance, with emphasis on conceptual aspects of osmosis and cell volume regulation; 2) osmosensation and the hypothalamic supraoptic nucleus (SON), starting with analysis of the electrophysiological responses of the magnocellular neurosecretory cells (MNCs) involved in the osmoreception phenomenon; 3) transcriptomic plasticity of SON during sustained hyperosmolality, to pinpoint the genes coding membrane channels and transporters already shown to participate in the osmosensation and new candidates that may have their role further investigated in this process, with emphasis on those expressed in the MNCs, discussing the relationships of hydration state, gene expression, and MNCs electrical activity; and 4) somatodendritic release of neuropeptides in relation to osmoregulation. Finally, we expect that by stressing the relationship between gene expression and the electrical activity of MNCs, studies about the newly discovered plastic-regulated genes that code channels and transporters in the SON may emerge.
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Affiliation(s)
- André Souza Mecawi
- Laboratory of Molecular Neuroendocrinology, Department of Biophysics, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil
| | - Wamberto Antonio Varanda
- Department of Physiology, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Melina Pires da Silva
- Laboratory of Cellular Neuroendocrinology, Department of Biophysics, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil
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Bárez-López S, Konopacka A, Cross SJ, Greenwood M, Skarveli M, Murphy D, Greenwood MP. Transcriptional and Post-Transcriptional Regulation of Oxytocin and Vasopressin Gene Expression by CREB3L1 and CAPRIN2. Neuroendocrinology 2022; 112:1058-1077. [PMID: 35051932 DOI: 10.1159/000522088] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 01/06/2022] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Water homoeostasis is achieved by secretion of the peptide hormones arginine vasopressin (AVP) and oxytocin (OXT) that are synthesized by separate populations of magnocellular neurones (MCNs) in the supraoptic and paraventricular (PVN) nuclei of the hypothalamus. To further understand the molecular mechanisms that facilitate biosynthesis of AVP and OXT by MCNs, we have explored the spatiotemporal dynamic, both mRNA and protein expression, of two genes identified by our group as being important components of the osmotic defence response: Caprin2 and Creb3l1. METHODS By RNA in situ hybridization and immunohistochemistry, we have characterized the expression of Caprin2 and Creb3l1 in MCNs in the basal state, in response to dehydration, and during rehydration in the rat. RESULTS We found that Caprin2 and Creb3l1 are expressed in AVP and OXT MCNs and in response to dehydration expression increases in both MCN populations. Protein levels mirror the increase in transcript levels for both CREB3L1 and CAPRIN2. In view of increased CREB3L1 and CAPRIN2 expression in OXT neurones by dehydration, we explored OXT-specific functions for these genes. By luciferase assays, we demonstrate that CREB3L1 may be a transcription factor regulating Oxt gene expression. By RNA immunoprecipitation assays and Northern blot analysis of Oxt mRNA poly(A) tails, we have found that CAPRIN2 binds to Oxt mRNA and regulates its poly(A) tail length. Moreover, in response to dehydration, Caprin2 mRNA is subjected to nuclear retention, possibly to regulate Caprin2 mRNA availability in the cytoplasm. CONCLUSION The exploration of the spatiotemporal dynamics of Creb3l1- and Caprin2-encoded mRNAs and proteins has provided novel insights beyond the AVP-ergic system, revealing novel OXT-ergic system roles of these genes in the osmotic defence response.
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Affiliation(s)
- Soledad Bárez-López
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, UK
| | - Agnieszka Konopacka
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, UK
| | - Stephen J Cross
- Wolfson Bioimaging Facility, Biomedical Sciences Building, University of Bristol, Bristol, UK
| | - Mingkwan Greenwood
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, UK
| | - Marina Skarveli
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, UK
| | - David Murphy
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, UK
| | - Michael P Greenwood
- Molecular Neuroendocrinology Research Group, Bristol Medical School, Translational Health Sciences, University of Bristol, Dorothy Hodgkin Building, Bristol, UK
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He Q, Li Z, Lei X, Zou Q, Yu H, Ding Y, Xu G, Zhu W. The underlying molecular mechanisms and prognostic factors of RNA binding protein in colorectal cancer: a study based on multiple online databases. Cancer Cell Int 2021; 21:325. [PMID: 34193169 PMCID: PMC8244213 DOI: 10.1186/s12935-021-02031-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Accepted: 06/19/2021] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND RNA binding protein (RBP) is an active factor involved in the occurrence and development of colorectal cancer (CRC). Therefore, the potential mechanism of RBP in CRC needs to be clarified by dry-lab analyses or wet-lab experiments. METHODS The differential RBP gene obtained from the GEPIA 2 (Gene Expression Profiling Interactive Analysis 2) were performed functional enrichment analysis. Then, the alternative splicing (AS) events related to survival were acquired by univariate regression analysis, and the correlation between RBP and AS was analyzed by R software. The online databases were conducted to analyze the mutation and methylation of RBPs in CRC. Moreover, 5 key RBP signatures were obtained through univariate and multivariate Cox regression analysis and established as RBP prognosis model. Subsequently, the above model was verified through another randomized group of TCGA CRC cohorts. Finally, multiple online databases and qRT-PCR analysis were carried to further confirm the expression of the above 5 RBP signatures in CRC. RESULTS Through a comprehensive bioinformatics analysis, it was revealed that RBPs had genetic and epigenetic changes in CRC. We obtained 300 differentially expressed RBPs in CRC samples. The functional analysis suggested that they mainly participated in spliceosome. Then, a regulatory network for RBP was established to participate in AS and DDX39B was detected to act as a potentially essential factor in the regulation of AS in CRC. Our analysis discovered that 11 differentially expressed RBPs with a mutation frequency higher than 5%. Furthermore, we found that 10 differentially expressed RBPs had methylation sites related to the prognosis of CRC, and a prognostic model was constructed by the 5 RBP signatures. In another randomized group of TCGA CRC cohorts, the prognostic performance of the 5 RBP signatures was verified. CONCLUSION The potential mechanisms that regulate the aberrant expression of RBPs in the development of CRC was explored, a network that regulated AS was established, and the RBP-related prognosis model was constructed and verified, which could improve the individualized prognosis prediction of CRC.
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Affiliation(s)
- Qinglian He
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China
| | - Ziqi Li
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China
| | - Xue Lei
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China
| | - Qian Zou
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China
| | - Haibing Yu
- School of Public Health, Guangdong Medical University, Dongguan, 523808, Guangdong Province, China
| | - Yuanlin Ding
- School of Public Health, Guangdong Medical University, Dongguan, 523808, Guangdong Province, China
| | - Guangxian Xu
- Guangdong Provincial Key Laboratory of Medical Molecular Diagnostics, School of Medical Technology, Institute of Clinical Laboratory, Guangdong Medical University, Dongguan, 523808, Guangdong Province, China
| | - Wei Zhu
- Department of Pathology, Guangdong Medical University, No.1 Xincheng Road, Dongguan, 523808, Guangdong Province, China.
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Pauža AG, Mecawi AS, Paterson A, Hindmarch CCT, Greenwood M, Murphy D, Greenwood MP. Osmoregulation of the transcriptome of the hypothalamic supraoptic nucleus: A resource for the community. J Neuroendocrinol 2021; 33:e13007. [PMID: 34297454 DOI: 10.1111/jne.13007] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/25/2021] [Accepted: 06/20/2021] [Indexed: 01/13/2023]
Abstract
The hypothalamic supraoptic nucleus (SON) is a core osmoregulatory control centre that deciphers information about the metabolic state of the organism and orchestrates appropriate homeostatic (endocrine) and allostatic (behavioural) responses. We have used RNA sequencing to describe the polyadenylated transcriptome of the SON of the male Wistar Han rat. These data have been mined to generate comprehensive catalogues of functional classes of genes (enzymes, transcription factors, endogenous peptides, G protein coupled receptors, transporters, catalytic receptors, channels and other pharmacological targets) expressed in this nucleus in the euhydrated state, and that together form the basal substrate for its physiological interactions. We have gone on to show that fluid deprivation for 3 days (dehydration) results in changes in the expression levels of 2247 RNA transcripts, which have similarly been functionally catalogued, and further mined to describe enriched gene categories and putative regulatory networks (Regulons) that may have physiological importance in SON function related plasticity. We hope that the revelation of these genes, pathways and networks, most of which have no characterised roles in the SON, will encourage the neuroendocrine community to pursue new investigations into the new 'known-unknowns' reported in the present study.
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Affiliation(s)
- Audrys G Pauža
- Molecular Neuroendocrinology Research Group, Bristol Medical School: Translational Health Sciences, University of Bristol, Bristol, UK
| | - André Souza Mecawi
- Laboratory of Neuroendocrinology, Department of Biophysics, Paulista School of Medicine, Federal University of São Paulo, São Paulo, Brazil
| | - Alex Paterson
- Molecular Neuroendocrinology Research Group, Bristol Medical School: Translational Health Sciences, University of Bristol, Bristol, UK
- Bristol Genomics Facility, University of Bristol, Bristol, UK
| | - Charles C T Hindmarch
- Queen's Cardiopulmonary Unit (QCPU), Department of Medicine, Translational Institute of Medicine (TIME), Queen's University, Kingston, ON, Canada
| | - Mingkwan Greenwood
- Molecular Neuroendocrinology Research Group, Bristol Medical School: Translational Health Sciences, University of Bristol, Bristol, UK
| | - David Murphy
- Molecular Neuroendocrinology Research Group, Bristol Medical School: Translational Health Sciences, University of Bristol, Bristol, UK
| | - Michael P Greenwood
- Molecular Neuroendocrinology Research Group, Bristol Medical School: Translational Health Sciences, University of Bristol, Bristol, UK
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Kim DH, Kim KK, Lee TH, Eom H, Kim JW, Park JW, Jeong JK, Lee BJ. Transcription Factor TonEBP Stimulates Hyperosmolality-Dependent Arginine Vasopressin Gene Expression in the Mouse Hypothalamus. Front Endocrinol (Lausanne) 2021; 12:627343. [PMID: 33796071 PMCID: PMC8008816 DOI: 10.3389/fendo.2021.627343] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 02/17/2021] [Indexed: 11/13/2022] Open
Abstract
The hypothalamic neuroendocrine system is strongly implicated in body energy homeostasis. In particular, the degree of production and release of arginine vasopressin (AVP) in the hypothalamus is affected by plasma osmolality, and that hypothalamic AVP is responsible for thirst and osmolality-dependent water and metabolic balance. However, the osmolality-responsive intracellular mechanism within AVP cells that regulates AVP synthesis is not clearly understood. Here, we report a role for tonicity-responsive enhancer binding protein (TonEBP), a transcription factor sensitive to cellular tonicity, in regulating osmosensitive hypothalamic AVP gene transcription. Our immunohistochemical work shows that hypothalamic AVP cellular activity, as recognized by c-fos, was enhanced in parallel with an elevation in TonEBP expression within AVP cells following water deprivation. Interestingly, our in vitro investigations found a synchronized pattern of TonEBP and AVP gene expression in response to osmotic stress. Those results indicate a positive correlation between hypothalamic TonEBP and AVP production during dehydration. Promoter and chromatin immunoprecipitation assays confirmed that TonEBP can bind directly to conserved binding motifs in the 5'-flanking promoter regions of the AVP gene. Furthermore, dehydration- and TonEBP-mediated hypothalamic AVP gene activation was reduced in TonEBP haploinsufficiency mice, compared with wild TonEBP homozygote animals. Therefore, our result support the idea that TonEBP is directly necessary, at least in part, for the elevation of AVP transcription in dehydration conditions. Additionally, dehydration-induced reductions in body weight were rescued in TonEBP haploinsufficiency mice. Altogether, our results demonstrate an intracellular machinery within hypothalamic AVP cells that is responsible for dehydration-induced AVP synthesis.
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Affiliation(s)
- Dong Hee Kim
- Department of Biological Sciences, College of Natural Sciences, University of Ulsan, Ulsan, South Korea
| | - Kwang Kon Kim
- Department of Biological Sciences, College of Natural Sciences, University of Ulsan, Ulsan, South Korea
| | - Tae Hwan Lee
- Department of Biological Sciences, College of Natural Sciences, University of Ulsan, Ulsan, South Korea
| | - Hyejin Eom
- Department of Biological Sciences, College of Natural Sciences, University of Ulsan, Ulsan, South Korea
| | - Jin Woo Kim
- Department of Biological Sciences, College of Natural Sciences, University of Ulsan, Ulsan, South Korea
| | - Jeong Woo Park
- Department of Biological Sciences, College of Natural Sciences, University of Ulsan, Ulsan, South Korea
| | - Jin Kwon Jeong
- Department of Pharmacology and Physiology, School of Medicine & Health Sciences, The George Washington University, Washington, DC, United States
- *Correspondence: Byung Ju Lee, ; Jin Kwon Jeong,
| | - Byung Ju Lee
- Department of Biological Sciences, College of Natural Sciences, University of Ulsan, Ulsan, South Korea
- *Correspondence: Byung Ju Lee, ; Jin Kwon Jeong,
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Nakazawa K, Shichino Y, Iwasaki S, Shiina N. Implications of RNG140 (caprin2)-mediated translational regulation in eye lens differentiation. J Biol Chem 2020; 295:15029-15044. [PMID: 32839273 DOI: 10.1074/jbc.ra120.012715] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2020] [Revised: 08/07/2020] [Indexed: 01/02/2023] Open
Abstract
Regulation of gene expression at the translational level is key to determining cell fate and function. An RNA-binding protein, RNG140 (caprin2), plays a role in eye lens differentiation and has been reported to function in translational regulation. However, the mechanism and its role in eyes has remained unclear. Here, we show that RNG140 binds to the translation initiation factor eukaryotic initiation factor 3 (eIF3) and suppresses translation through mechanisms involving suppression of eIF3-dependent translation initiation. Comprehensive ribosome profiling revealed that overexpression of RNG140 in cultured Chinese hamster ovary cells reduces translation of long mRNAs, including those associated with cell proliferation. RNG140-mediated translational regulation also operates in the mouse eye, where RNG140 knockout increased the translation of long mRNAs. mRNAs involved in lens differentiation, such as crystallin mRNAs, are short and can escape translational inhibition by RNG140 and be translated in differentiating lenses. Thus, this study provides insights into the mechanistic basis of lens cell transition from proliferation to differentiation via RNG140-mediated translational regulation.
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Affiliation(s)
- Kaori Nakazawa
- Laboratory of Neuronal Cell Biology, National Institute for Basic Biology, Okazaki, Aichi, Japan; Department of Basic Biology, SOKENDAI (Graduate University for Advanced Studies), Okazaki, Aichi, Japan
| | - Yuichi Shichino
- RNA Systems Biochemistry Laboratory, RIKEN Cluster for Pioneering Research, Saitama, Japan
| | - Shintaro Iwasaki
- RNA Systems Biochemistry Laboratory, RIKEN Cluster for Pioneering Research, Saitama, Japan; Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, University of Tokyo, Chiba, Japan
| | - Nobuyuki Shiina
- Laboratory of Neuronal Cell Biology, National Institute for Basic Biology, Okazaki, Aichi, Japan; Department of Basic Biology, SOKENDAI (Graduate University for Advanced Studies), Okazaki, Aichi, Japan; Exploratory Research Center on Life and Living Systems (ExCELLS), Okazaki, Aichi, Japan.
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11
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Zhu J, Zhou X, Huang X, Du Z. Crystal structure of a 123 amino acids dimerization domain of Drosophila Caprin. Proteins 2020; 88:1701-1711. [PMID: 32725918 DOI: 10.1002/prot.25987] [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: 11/26/2019] [Revised: 03/12/2020] [Accepted: 07/26/2020] [Indexed: 11/12/2022]
Abstract
Cytoplasmic activation/proliferation-associated protein (Caprin) proteins assume diverse functions in many important biological processes, including synaptic plasticity, stress response, innate immune response, and cellular proliferation. The Caprin family members are characterized by the presence of a highly conserved homologous region (HR1) at the N-terminus and arginine-glycine-rich (RGG) boxes at the C-terminus. We had previously determined the crystal structures of human Caprin-1 and Caprin-2 fragments corresponding to the C-terminal 2/3 of HR1. Both fragments adopt homodimeric structures. Based on sequence conservation, we speculated that all Caprin proteins should have similar homodimeric structures. Here we report the crystal structure of a fragment (residues 187-309) of Drosophila melanogaster Caprin (dCaprin). The dCaprin fragment adopts an all α-helical fold which self-associates to form a homodimer. The overall dCaprin homodimeric structure is similar to the Caprin-1 and Caprin-2 homodimeric structures. Most of the amino acids residues mediating homodimerization in the three structures are conserved among all Caprin family members. These structural and sequence data suggest that homodimerization through a conserved dimerization domain is a common structural feature of the Caprin protein family. The dimeric structures may also be involved in interaction with Caprin partners. Dimer formation creates a V-shape concave surface that may serve as a protein binding groove. The concave surfaces in Caprin-1, Caprin-2, and dCaprin should have different and specific binding partners due to the large difference in electrostatic potentials. We propose the existence of a multi-functional domain in Caprin proteins, which not only mediate homodimerization but also involve in interaction with specific Caprin partners.
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Affiliation(s)
- Jiang Zhu
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois, USA
| | - Xia Zhou
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois, USA
| | - Xiaolan Huang
- Department of Computer Science, Southern Illinois University, Carbondale, Illinois, USA
| | - Zhihua Du
- Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois, USA
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12
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Ramachandran CD, Gholami K, Lam SK, Hoe SZ. A preliminary study of the effect of a high-salt diet on transcriptome dynamics in rat hypothalamic forebrain and brainstem cardiovascular control centers. PeerJ 2020; 8:e8528. [PMID: 32175184 PMCID: PMC7059759 DOI: 10.7717/peerj.8528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 01/07/2020] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND High dietary salt intake is strongly correlated with cardiovascular (CV) diseases and it is regarded as a major risk factor associated with the pathogenesis of hypertension. The CV control centres in the brainstem (the nucleus tractus solitarii (NTS) and the rostral ventrolateral medulla (RVLM)) and hypothalamic forebrain (the subfornical organ, SFO; the supraoptic nucleus, SON and the paraventricular nucleus, PVN) have critical roles in regulating CV autonomic motor outflows, and thus maintaining blood pressure (BP). Growing evidence has implicated autonomic regulatory networks in salt-sensitive HPN (SSH), but the genetic basis remains to be delineated. We hypothesized that the development and/ or maintenance of SSH is reliant on the change in the expression of genes in brain regions controlling the CV system. METHODOLOGY We used RNA-Sequencing (RNA-Seq) to describe the differential expression of genes in SFO, SON, PVN, NTS and RVLM of rats being chronically fed with high-salt (HS) diet. Subsequently, a selection of putatively regulated genes was validated with quantitative reverse transcription polymerase chain reaction (qRT-PCR) in both Spontaneously Hypertensive rats (SHRs) and Wistar Kyoto (WKY) rats. RESULTS The findings enabled us to identify number of differentially expressed genes in SFO, SON, PVN, NTS and RVLM; that are either up-regulated in both strains of rats (SON- Caprin2, Sctr), down-regulated in both strains of rats (PVN- Orc, Gkap1), up-regulated only in SHRs (SFO- Apopt1, Lin52, AVP, OXT; SON- AVP, OXT; PVN- Caprin2, Sclt; RVLM- A4galt, Slc29a4, Cmc1) or down-regulated only in SHRs (SON- Ndufaf2, Kcnv1; PVN- Pi4k2a; NTS- Snrpd2l, Ankrd29, St6galnac6, Rnf157, Iglon5, Csrnp3, Rprd1a; RVLM- Ttr, Faim). CONCLUSIONS These findings demonstrated the adverse effects of HS diet on BP, which may be mediated via modulating the signaling systems in CV centers in the hypothalamic forebrain and brainstem.
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Affiliation(s)
- Chitra Devi Ramachandran
- Department of Physiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Wilayah Perseketuan, Malaysia
| | - Khadijeh Gholami
- Department of Physiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Wilayah Perseketuan, Malaysia
- Human Biology Division, School of Medicine, International Medical University, Kuala Lumpur, Wilayah Perseketuan, Malaysia
| | - Sau Kuen Lam
- Department of Physiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Wilayah Perseketuan, Malaysia
- Department of Pre-Clinical Sciences, Faculty of Medicine and Health Sciences, Universiti Tunku Abdul Rahman, Sungai Long, Selangor, Malaysia
| | - See Ziau Hoe
- Department of Physiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Wilayah Perseketuan, Malaysia
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13
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Wu Y, Zhu J, Huang X, Zhou X, Du Z. Crystal structure of a dimerization domain of human Caprin-2: similar overall dimeric fold but different molecular surface properties to that of human Caprin-1. J Biomol Struct Dyn 2018; 37:3968-3975. [PMID: 30304999 DOI: 10.1080/07391102.2018.1532817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Human Caprin-1 and Caprin-2 are prototypic members of the caprin (cytoplasmic activation/proliferation-associated protein) protein family. Vertebrate caprin proteins contain two highly conserved homologous regions (HR1 and HR2) and C-terminal RGG motifs. Drosophila caprin (dCaprin) shares HR1 and RGG motifs but lacks HR2. Caprin-1 and Caprin-2 have important and non-redundant functions. The detailed molecular mechanisms of their actions remain largely unknown. Previously, we determined the crystal structure of a ∼120-residue fragment of Caprin-1 within the HR1 region. The structure has a novel all α-helical fold that self-associates to form a homodimer. In this study, the crystal structure of a corresponding fragment from Caprin-2 is reported. The Caprin-2 fragment has similar protein fold and dimeric structure as that of the Caprin-1 fragment. Structural comparison reveals that the molecular interactions mediating homodimerization of Caprin-1 and Caprin-2 are largely conserved in the two systems. Structural-modelling study of the corresponding dCaprin fragment indicates that dCaprin may also adopt a similar dimeric structure. The presence of a dimerization domain within HR1 may represent an evolutionarily conserved feature of the caprin protein family. Interestingly, while Caprin-1 and Caprin-2 adopt similar overall dimeric structures, the two structures have quite different molecular surface properties. In the Caprin-1 dimeric structure, some of the surface areas are known or suspected to function as binding sites for Carpin-1-interacting proteins. The different surface properties of the caprin dimeric structures may dictate their intermolecular interaction with specific protein partners. Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Yuhong Wu
- a Department of Chemistry and Biochemistry, Southern Illinois University at Carbondale , IL , USA
| | - Jiang Zhu
- a Department of Chemistry and Biochemistry, Southern Illinois University at Carbondale , IL , USA
| | - Xiaolan Huang
- b Department of Computer Science, Southern Illinois University at Carbondale , IL , USA
| | - Xia Zhou
- a Department of Chemistry and Biochemistry, Southern Illinois University at Carbondale , IL , USA
| | - Zhihua Du
- a Department of Chemistry and Biochemistry, Southern Illinois University at Carbondale , IL , USA
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14
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Greenwood MP, Greenwood M, Romanova EV, Mecawi AS, Paterson A, Sarenac O, Japundžić-Žigon N, Antunes-Rodrigues J, Paton JFR, Sweedler JV, Murphy D. The effects of aging on biosynthetic processes in the rat hypothalamic osmoregulatory neuroendocrine system. Neurobiol Aging 2018; 65:178-191. [PMID: 29494864 PMCID: PMC5878011 DOI: 10.1016/j.neurobiolaging.2018.01.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 07/11/2017] [Accepted: 01/16/2018] [Indexed: 11/21/2022]
Abstract
Elderly people exhibit a diminished capacity to cope with osmotic challenges such as dehydration. We have undertaken a detailed molecular analysis of arginine vasopressin (AVP) biosynthetic processes in the supraoptic nucleus (SON) of the hypothalamus and secretory activity in the posterior pituitary of adult (3 months) and aged (18 months) rats, to provide a comprehensive analysis of age-associated changes to the AVP system. By matrix-assisted laser desorption/ionization time-of-flight mass spectrometry analysis, we identified differences in pituitary peptides, including AVP, in adult and aged rats under both basal and dehydrated states. In the SON, increased Avp gene transcription, coincided with reduced Avp promoter methylation in aged rats. Based on transcriptome data, we have previously characterized a number of novel dehydration-induced regulatory factors involved in the response of the SON to osmotic cues. We found that some of these increase in expression with age, while dehydration-induced expression of these genes in the SON was attenuated in aged rats. In summary, we show that aging alters the rat AVP system at the genome, transcriptome, and peptidome levels. These alterations however did not affect circulating levels of AVP in basal or dehydrated states.
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Affiliation(s)
| | | | - Elena V Romanova
- Department of Chemistry and the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Andre S Mecawi
- School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; Department of Physiology, University of Malaya, Kuala Lumpur, Malaysia; Department of Physiological Sciences, Institute of Biological and Health Sciênces, Federal Rural University of Rio de Janeiro, Seropedica, Brazil
| | - Alex Paterson
- School of Clinical Sciences, University of Bristol, Bristol, England
| | - Olivera Sarenac
- School of Clinical Sciences, University of Bristol, Bristol, England; Institute of Pharmacology, Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | - Nina Japundžić-Žigon
- Institute of Pharmacology, Clinical Pharmacology and Toxicology, Faculty of Medicine, University of Belgrade, Belgrade, Serbia
| | | | - Julian F R Paton
- School of Physiology and Pharmacology, University of Bristol, Bristol, England
| | - Jonathan V Sweedler
- Department of Chemistry and the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - David Murphy
- School of Clinical Sciences, University of Bristol, Bristol, England; Department of Physiology, University of Malaya, Kuala Lumpur, Malaysia
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15
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Unsupervised Network Analysis of the Plastic Supraoptic Nucleus Transcriptome Predicts Caprin2 Regulatory Interactions. eNeuro 2017; 4:eN-NWR-0243-17. [PMID: 29279858 PMCID: PMC5738864 DOI: 10.1523/eneuro.0243-17.2017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 09/11/2017] [Accepted: 09/25/2017] [Indexed: 11/21/2022] Open
Abstract
The supraoptic nucleus (SON) is a group of neurons in the hypothalamus responsible for the synthesis and secretion of the peptide hormones vasopressin and oxytocin. Following physiological cues, such as dehydration, salt-loading and lactation, the SON undergoes a function related plasticity that we have previously described in the rat at the transcriptome level. Using the unsupervised graphical lasso (Glasso) algorithm, we reconstructed a putative network from 500 plastic SON genes in which genes are the nodes and the edges are the inferred interactions. The most active nodal gene identified within the network was Caprin2. Caprin2 encodes an RNA-binding protein that we have previously shown to be vital for the functioning of osmoregulatory neuroendocrine neurons in the SON of the rat hypothalamus. To test the validity of the Glasso network, we either overexpressed or knocked down Caprin2 transcripts in differentiated rat pheochromocytoma PC12 cells and showed that these manipulations had significant opposite effects on the levels of putative target mRNAs. These studies suggest that the predicative power of the Glasso algorithm within an in vivo system is accurate, and identifies biological targets that may be important to the functional plasticity of the SON.
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