1
|
Wang X, Yi Z, Shi M, Sun Y. The Diverse Functions of the Calcium- and Integrin-Binding Protein Family. Int J Mol Sci 2025; 26:2223. [PMID: 40076845 PMCID: PMC11900603 DOI: 10.3390/ijms26052223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2025] [Revised: 02/25/2025] [Accepted: 02/27/2025] [Indexed: 03/14/2025] Open
Abstract
The calcium- and integrin-binding protein (CIB) family, comprising four evolutionarily conserved members (CIB1, CIB2, CIB3, and CIB4), is characterized by canonical EF-hand motifs. The functions of CIBs in the inner ear have been investigated, although further research is still necessary to gain a comprehensive understanding of them. Among the CIB family members, CIB2 is essential for auditory function. CIB3 and CIB2 jointly participate in the regulation of balance. Beyond their sensory roles, CIBs exhibit multifunctionality through calcium-dependent interactions with diverse molecular partners, contributing to the pathogenesis of various conditions, including neurological disorders, cardiovascular diseases, cancer, and male infertility. In this review, we discuss the conserved structure of the CIB family, highlighting its contributions to various biological functions. We also summarize the distribution and function of the CIB family, emphasizing the pivotal roles of CIB2 and CIB3 in hearing and balance.
Collapse
Affiliation(s)
- Xiaoying Wang
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Zhangyi Yi
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Mengwen Shi
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Yu Sun
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
- Institute of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
- Hubei Province Clinic Research Center for Deafness and Vertigo, Wuhan 430022, China
| |
Collapse
|
2
|
Dal Cortivo G, Dell’Orco D. Calcium- and Integrin-Binding Protein 2 (CIB2) in Physiology and Disease: Bright and Dark Sides. Int J Mol Sci 2022; 23:ijms23073552. [PMID: 35408910 PMCID: PMC8999013 DOI: 10.3390/ijms23073552] [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] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 03/19/2022] [Accepted: 03/22/2022] [Indexed: 12/04/2022] Open
Abstract
Calcium- and integrin-binding protein 2 (CIB2) is a small EF-hand protein capable of binding Mg2+ and Ca2+ ions. While its biological function remains largely unclear, an increasing number of studies have shown that CIB2 is an essential component of the mechano-transduction machinery that operates in cochlear hair cells. Mutations in the gene encoding CIB2 have been associated with non-syndromic deafness. In addition to playing an important role in the physiology of hearing, CIB2 has been implicated in a multitude of very different processes, ranging from integrin signaling in platelets and skeletal muscle to autophagy, suggesting extensive functional plasticity. In this review, we summarize the current understanding of biochemical and biophysical properties of CIB2 and the biological roles that have been proposed for the protein in a variety of processes. We also highlight the many molecular aspects that remain unclarified and deserve further investigation.
Collapse
|
3
|
Bioinformatics analyses of significant genes, related pathways, and candidate diagnostic biomarkers and molecular targets in SARS-CoV-2/COVID-19. GENE REPORTS 2020; 21:100956. [PMID: 33553808 PMCID: PMC7854084 DOI: 10.1016/j.genrep.2020.100956] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Accepted: 10/31/2020] [Indexed: 12/12/2022]
Abstract
Severe acute respiratory syndrome corona virus 2 (SARS-CoV-2) infection is a leading cause of pneumonia and death. The aim of this investigation is to identify the key genes in SARS-CoV-2 infection and uncover their potential functions. We downloaded the expression profiling by high throughput sequencing of GSE152075 from the Gene Expression Omnibus database. Normalization of the data from primary SARS-CoV-2 infected samples and negative control samples in the database was conducted using R software. Then, joint analysis of the data was performed. Pathway and Gene ontology (GO) enrichment analyses were performed, and the protein-protein interaction (PPI) network, target gene - miRNA regulatory network, target gene - TF regulatory network of the differentially expressed genes (DEGs) were constructed using Cytoscape software. Identification of diagnostic biomarkers was conducted using receiver operating characteristic (ROC) curve analysis. 994 DEGs (496 up regulated and 498 down regulated genes) were identified. Pathway and GO enrichment analysis showed up and down regulated genes mainly enriched in the NOD-like receptor signaling pathway, Ribosome, response to external biotic stimulus and viral transcription in SARS-CoV-2 infection. Down and up regulated genes were selected to establish the PPI network, modules, target gene - miRNA regulatory network, target gene - TF regulatory network revealed that these genes were involved in adaptive immune system, fluid shear stress and atherosclerosis, influenza A and protein processing in endoplasmic reticulum. In total, ten genes (CBL, ISG15, NEDD4, PML, REL, CTNNB1, ERBB2, JUN, RPS8 and STUB1) were identified as good diagnostic biomarkers. In conclusion, the identified DEGs, hub genes and target genes contribute to the understanding of the molecular mechanisms underlying the advancement of SARS-CoV-2 infection and they may be used as diagnostic and molecular targets for the treatment of patients with SARS-CoV-2 infection in the future.
Collapse
Key Words
- Bioinformatics
- CBL, Cbl proto-oncogene
- DEGs, differentially expressed genes
- Diagnosis
- GO, Gene ontology
- ISG15, ISG15 ubiquitin like modifier
- Key genes
- NEDD4, NEDD4 E3 ubiquitin protein ligase
- PML, promyelocyticleukemia
- PPI, protein-protein interaction
- Pathways
- REL, REL proto-oncogene, NF-kB subunit
- ROC, receiver operating characteristic
- SARS-CoV-2 infection
- SARS-CoV-2, Severe acute respiratory syndrome corona virus 2
Collapse
|
4
|
Cunha-Santos C, Perdigao PRL, Martin F, Oliveira JG, Cardoso M, Manuel A, Taveira N, Goncalves J. Inhibition of HIV replication through siRNA carried by CXCR4-targeted chimeric nanobody. Cell Mol Life Sci 2020; 77:2859-2870. [PMID: 31641784 PMCID: PMC11104913 DOI: 10.1007/s00018-019-03334-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 09/24/2019] [Accepted: 10/03/2019] [Indexed: 01/05/2023]
Abstract
Small interfering RNA (siRNA) application in therapy still faces a major challenge with the lack of an efficient and specific delivery system. Current vehicles are often responsible for poor efficacy, safety concerns, and burden costs of siRNA-based therapeutics. Here, we describe a novel strategy for targeted delivery of siRNA molecules to inhibit human immunodeficiency virus (HIV) infection. Specific membrane translocation of siRNA inhibitor was addressed by an engineered nanobody targeting the HIV co-receptor CXCR4 (NbCXCR4) in fusion with a single-chain variable fragment (4M5.3) that carried the FITC-conjugated siRNA. 4M5.3-NbCXCR4 conjugate (4M5.3X4) efficiently targeted CXCR4+ T lymphocytes, specifically translocating siRNA by receptor-mediated endocytosis. Targeted delivery of siRNA directed to the mRNA of HIV transactivator tat silenced Tat-driven viral transcription and inhibited the replication of distinct virus clades. In summary, we have shown that the engineered nanobody chimera developed in this study constitutes an efficient and specific delivery method of siRNAs through CXCR4 receptor.
Collapse
Affiliation(s)
- Catarina Cunha-Santos
- Molecular Microbiology and Biotechnology Department, Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisbon, Portugal
| | - Pedro Ricardo Lucas Perdigao
- Molecular Microbiology and Biotechnology Department, Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisbon, Portugal
| | - Francisco Martin
- HIV Evolution, Epidemiology and Prevention Department, Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| | - Joana Gomes Oliveira
- Molecular Microbiology and Biotechnology Department, Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisbon, Portugal
| | - Miguel Cardoso
- Molecular Microbiology and Biotechnology Department, Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisbon, Portugal
| | - Ana Manuel
- Molecular Microbiology and Biotechnology Department, Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisbon, Portugal
| | - Nuno Taveira
- HIV Evolution, Epidemiology and Prevention Department, Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz, Monte de Caparica, Portugal
| | - Joao Goncalves
- Molecular Microbiology and Biotechnology Department, Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003, Lisbon, Portugal.
| |
Collapse
|
5
|
Dal Cortivo G, Marino V, Iacobucci C, Vallone R, Arlt C, Rehkamp A, Sinz A, Dell'Orco D. Oligomeric state, hydrodynamic properties and target recognition of human Calcium and Integrin Binding protein 2 (CIB2). Sci Rep 2019; 9:15058. [PMID: 31636333 PMCID: PMC6803640 DOI: 10.1038/s41598-019-51573-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 09/12/2019] [Indexed: 11/23/2022] Open
Abstract
Calcium- and Integrin-Binding protein 2 (CIB2) is a small and ubiquitously expressed protein with largely unknown biological function but ascertained role in hearing physiology and disease. Recent studies found that CIB2 binds Ca2+ with moderate affinity and dimerizes under conditions mimicking the physiological ones. Here we provided new lines of evidence on CIB2 oligomeric state and the mechanism of interaction with the α7B integrin target. Based on a combination of native mass spectrometry, chemical cross-linking/mass spectrometry, analytical gel filtration, dynamic light scattering and molecular dynamics simulations we conclude that CIB2 is monomeric under all tested conditions and presents uncommon hydrodynamic properties, most likely due to the high content of hydrophobic solvent accessible surface. Surface plasmon resonance shows that the interaction with α7B occurs with relatively low affinity and is limited to the cytosolic region proximal to the membrane, being kinetically favored in the presence of physiological Mg2+ and in the absence of Ca2+. Although CIB2 binds to an α7B peptide in a 1:1 stoichiometry, the formation of the complex might induce binding of another CIB2 molecule.
Collapse
Affiliation(s)
- Giuditta Dal Cortivo
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Biological Chemistry, University of Verona, Verona, Italy
| | - Valerio Marino
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Biological Chemistry, University of Verona, Verona, Italy
- Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Claudio Iacobucci
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Rosario Vallone
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Biological Chemistry, University of Verona, Verona, Italy
- Structural Biology and Biophysics Unit, Fondazione Ri.MED, Palermo, Italy
| | - Christian Arlt
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Anne Rehkamp
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Andrea Sinz
- Department of Pharmaceutical Chemistry and Bioanalytics, Institute of Pharmacy, Charles Tanford Protein Center, Martin Luther University Halle-Wittenberg, Halle, Germany
| | - Daniele Dell'Orco
- Department of Neurosciences, Biomedicine and Movement Sciences, Section of Biological Chemistry, University of Verona, Verona, Italy.
| |
Collapse
|
6
|
Vallone R, Dal Cortivo G, D'Onofrio M, Dell'Orco D. Preferential Binding of Mg 2+ Over Ca 2+ to CIB2 Triggers an Allosteric Switch Impaired in Usher Syndrome Type 1J. Front Mol Neurosci 2018; 11:274. [PMID: 30174586 PMCID: PMC6107761 DOI: 10.3389/fnmol.2018.00274] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 07/20/2018] [Indexed: 12/20/2022] Open
Abstract
Calcium and integrin binding protein 2 (CIB2) shares with the other members of the CIB family the ability to bind Ca2+ and Mg2+ via two functional EF-hand motifs, namely EF3 and EF4. As a cation sensor, CIB2 is able to switch to a conformation likely associated with specific biological functions yet to be clarified. Recent findings demonstrate the involvement of CIB2 in hearing physiology and a single, conservative point mutation (p.E64D) has been related to Usher Syndrome type 1J (USH1J) and non-syndromic hearing loss. We present an exhaustive biochemical and biophysical characterization of human wild type (WT) and E64D CIB2. We found that CIB2 does not possibly work as a calcium sensor under physiological conditions, its affinity for Ca2+ (Kdapp = 0.5 mM) being too low for detecting normal intracellular levels. Instead, CIB2 displays a significantly high affinity for Mg2+ (Kdapp = 290 μM), and it is probably Mg2+ -bound under physiological conditions. At odds with the homologous protein CIB1, CIB2 forms a non-covalent dimer under conditions that mimic the physiological ones, and as such it interacts with its physiological target α7B integrin. NMR spectroscopy revealed a long-range allosteric communication between the residue E64, located at the N-terminal domain, and the metal cation binding site EF3, located at the C-terminal domain. The conservative E64D mutation breaks up such inter-domain communication resulting in the impaired ability of CIB2 to switch to its Mg2+-bound form. The ability to bind the target integrin peptide was substantially conserved for E64D CIB2, thus suggesting that the molecular defect associated with USH1J resides in its inability to sense Mg2+ and adopt the required conformation.
Collapse
Affiliation(s)
- Rosario Vallone
- Section of Biological Chemistry, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | - Giuditta Dal Cortivo
- Section of Biological Chemistry, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | | | - Daniele Dell'Orco
- Section of Biological Chemistry, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| |
Collapse
|
7
|
Michel V, Booth KT, Patni P, Cortese M, Azaiez H, Bahloul A, Kahrizi K, Labbé M, Emptoz A, Lelli A, Dégardin J, Dupont T, Aghaie A, Oficjalska-Pham D, Picaud S, Najmabadi H, Smith RJ, Bowl MR, Brown SD, Avan P, Petit C, El-Amraoui A. CIB2, defective in isolated deafness, is key for auditory hair cell mechanotransduction and survival. EMBO Mol Med 2018; 9:1711-1731. [PMID: 29084757 PMCID: PMC5709726 DOI: 10.15252/emmm.201708087] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Defects of CIB2, calcium‐ and integrin‐binding protein 2, have been reported to cause isolated deafness, DFNB48 and Usher syndrome type‐IJ, characterized by congenital profound deafness, balance defects and blindness. We report here two new nonsense mutations (pGln12* and pTyr110*) in CIB2 patients displaying nonsyndromic profound hearing loss, with no evidence of vestibular or retinal dysfunction. Also, the generated CIB2−/− mice display an early onset profound deafness and have normal balance and retinal functions. In these mice, the mechanoelectrical transduction currents are totally abolished in the auditory hair cells, whilst they remain unchanged in the vestibular hair cells. The hair bundle morphological abnormalities of CIB2−/− mice, unlike those of mice defective for the other five known USH1 proteins, begin only after birth and lead to regression of the stereocilia and rapid hair‐cell death. This essential role of CIB2 in mechanotransduction and cell survival that, we show, is restricted to the cochlea, probably accounts for the presence in CIB2−/− mice and CIB2 patients, unlike in Usher syndrome, of isolated hearing loss without balance and vision deficits.
Collapse
Affiliation(s)
- Vincent Michel
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| | - Kevin T Booth
- Molecular Otolaryngology and Renal Research Laboratories, Department of Otolaryngology- Head and Neck Surgery, University of Iowa, Iowa City, Iowa.,Department of Molecular Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa
| | - Pranav Patni
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| | - Matteo Cortese
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| | - Hela Azaiez
- Molecular Otolaryngology and Renal Research Laboratories, Department of Otolaryngology- Head and Neck Surgery, University of Iowa, Iowa City, Iowa
| | - Amel Bahloul
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| | - Kimia Kahrizi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Ménélik Labbé
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| | - Alice Emptoz
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| | - Andrea Lelli
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| | - Julie Dégardin
- Sorbonne Universités, UPMC Univ Paris06, Paris, France.,Retinal information processing - Pharmacology and Pathology, Institut de la Vision, Paris, France
| | - Typhaine Dupont
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| | - Asadollah Aghaie
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France.,Syndrome de Usher et Autres Atteintes Rétino-Cochléaires, Institut de la Vision, Paris, France
| | - Danuta Oficjalska-Pham
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| | - Serge Picaud
- Sorbonne Universités, UPMC Univ Paris06, Paris, France.,Retinal information processing - Pharmacology and Pathology, Institut de la Vision, Paris, France
| | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Richard J Smith
- Molecular Otolaryngology and Renal Research Laboratories, Department of Otolaryngology- Head and Neck Surgery, University of Iowa, Iowa City, Iowa
| | - Michael R Bowl
- Mammalian Genetics Unit, MRC Harwell Institute, Oxford, UK
| | | | - Paul Avan
- Laboratoire de Biophysique Sensorielle, Faculté de Médecine, Biophysique Médicale, Centre Jean Perrin, Université d'Auvergne, Clermont-Ferrand, France
| | - Christine Petit
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France.,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France.,Collège de France, Paris, France
| | - Aziz El-Amraoui
- Génétique et Physiologie de l'Audition, Institut Pasteur, Paris, France .,Unité Mixte de Recherche- UMRS 1120, Institut National de la Santé et de la Recherche Médicale, Paris, France.,Sorbonne Universités, UPMC Univ Paris06, Paris, France
| |
Collapse
|
8
|
Zhu W, Jarman KE, Lokman NA, Neubauer HA, Davies LT, Gliddon BL, Taing H, Moretti PAB, Oehler MK, Pitman MR, Pitson SM. CIB2 Negatively Regulates Oncogenic Signaling in Ovarian Cancer via Sphingosine Kinase 1. Cancer Res 2017; 77:4823-4834. [PMID: 28729416 DOI: 10.1158/0008-5472.can-17-0025] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 06/02/2017] [Accepted: 07/12/2017] [Indexed: 11/16/2022]
Abstract
Sphingosine kinase 1 (SK1) is a key regulator of the cellular balance between proapoptotic and prosurvival sphingolipids. Oncogenic signaling by SK1 relies on its localization to the plasma membrane, which is mediated by the calcium and integrin binding protein CIB1 via its Ca2+-myristoyl switch function. Here we show that another member of the CIB family, CIB2, plays a surprisingly opposite role to CIB1 in the regulation of SK1 signaling. CIB2 bound SK1 on the same site as CIB1, yet it lacks the Ca2+-myristoyl switch function. As a result, CIB2 blocked translocation of SK1 to the plasma membrane and inhibited its subsequent signaling, which included sensitization to TNFα-induced apoptosis and inhibition of Ras-induced neoplastic transformation. CIB2 was significantly downregulated in ovarian cancer and low CIB2 expression was associated with poor prognosis in ovarian cancer patients. Notably, reintroduction of CIB2 in ovarian cancer cells blocked plasma membrane localization of endogenous SK1, reduced in vitro neoplastic growth and tumor growth in mice, and suppressed cell motility and invasiveness both in vitro and in vivo Consistent with the in vitro synergistic effects between the SK1-specific inhibitor SK1-I and standard chemotherapeutics, expression of CIB2 also sensitized ovarian cancer cells to carboplatin. Together, these findings identify CIB2 as a novel endogenous suppressor of SK1 signaling and potential prognostic marker and demonstrate the therapeutic potential of SK1 in this gynecologic malignancy. Cancer Res; 77(18); 4823-34. ©2017 AACR.
Collapse
Affiliation(s)
- Wenying Zhu
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, South Australia, Australia.,School of Biological Sciences, University of Adelaide, South Australia, Australia
| | - Kate E Jarman
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, South Australia, Australia.,School of Biological Sciences, University of Adelaide, South Australia, Australia
| | - Noor A Lokman
- School of Paediatrics and Reproductive Health, Robinson Research Institute, University of Adelaide, South Australia, Australia
| | - Heidi A Neubauer
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, South Australia, Australia
| | - Lorena T Davies
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, South Australia, Australia
| | - Briony L Gliddon
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, South Australia, Australia
| | - Houng Taing
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, South Australia, Australia
| | - Paul A B Moretti
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, South Australia, Australia
| | - Martin K Oehler
- School of Paediatrics and Reproductive Health, Robinson Research Institute, University of Adelaide, South Australia, Australia.,Department of Gynaecological Oncology, Royal Adelaide Hospital, Adelaide, South Australia, Australia
| | - Melissa R Pitman
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, South Australia, Australia
| | - Stuart M Pitson
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, South Australia, Australia. .,School of Biological Sciences, University of Adelaide, South Australia, Australia
| |
Collapse
|