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Yang D, Wu Y, Turan I, Keil J, Li K, Chen MH, Liu R, Wang L, Sun XL, Chen GY. Targeting intracellular Neu1 for coronavirus infection treatment. iScience 2023; 26:106037. [PMID: 36714013 PMCID: PMC9870608 DOI: 10.1016/j.isci.2023.106037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Revised: 12/03/2022] [Accepted: 01/18/2023] [Indexed: 01/25/2023] Open
Abstract
There are currently no effective therapies for COVID-19 or antivirals against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and vaccines appear less effective against new SARS-CoV-2 variants; thus, there is an urgent need to understand better the virulence mechanisms of SARS-CoV-2 and the host response to develop therapeutic agents. Herein, we show that host Neu1 regulates coronavirus replication by controlling sialylation on coronavirus nucleocapsid protein. Coronavirus nucleocapsid proteins in COVID-19 patients and in coronavirus HCoV-OC43-infected cells were heavily sialylated; this sialylation controlled the RNA-binding activity and replication of coronavirus. Neu1 overexpression increased HCoV-OC43 replication, whereas Neu1 knockdown reduced HCoV-OC43 replication. Moreover, a newly developed Neu1 inhibitor, Neu5Ac2en-OAcOMe, selectively targeted intracellular sialidase, which dramatically reduced HCoV-OC43 and SARS-CoV-2 replication in vitro and rescued mice from HCoV-OC43 infection-induced death. Our findings suggest Neu1 inhibitors could be used to limit SARS-CoV-2 replication in patients with COVID-19, making Neu1 a potential therapeutic target for COVID-19 and future coronavirus pandemics.
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Affiliation(s)
- Darong Yang
- Children’s Foundation Research Institute at Le Bonheur Children’s Hospital, Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38103, USA
| | - Yin Wu
- Children’s Foundation Research Institute at Le Bonheur Children’s Hospital, Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38103, USA
| | - Isaac Turan
- Department of Chemistry, Chemical and Biomedical Engineering and Center for Gene Regulation of Health and Disease (GRHD), Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA
| | - Joseph Keil
- Department of Chemistry, Chemical and Biomedical Engineering and Center for Gene Regulation of Health and Disease (GRHD), Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA
| | - Kui Li
- Department of Microbiology, Immunology and Biochemistry, University of Tennessee Health Science Center, Memphis, TN 38103, USA
| | - Michael H. Chen
- Children’s Foundation Research Institute at Le Bonheur Children’s Hospital, Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38103, USA
| | - Runhua Liu
- Department of Genetics, University of Alabama at Birmingham, Birmingham, AL 35233, USA
- Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Lizhong Wang
- Department of Genetics, University of Alabama at Birmingham, Birmingham, AL 35233, USA
- Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL 35233, USA
| | - Xue-Long Sun
- Department of Chemistry, Chemical and Biomedical Engineering and Center for Gene Regulation of Health and Disease (GRHD), Cleveland State University, 2121 Euclid Avenue, Cleveland, OH 44115, USA
| | - Guo-Yun Chen
- Children’s Foundation Research Institute at Le Bonheur Children’s Hospital, Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38103, USA
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Li L, Chen Y, Sluter MN, Hou R, Hao J, Wu Y, Chen GY, Yu Y, Jiang J. Ablation of Siglec-E augments brain inflammation and ischemic injury. J Neuroinflammation 2022; 19:191. [PMID: 35858866 PMCID: PMC9301848 DOI: 10.1186/s12974-022-02556-1] [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: 04/15/2022] [Accepted: 07/14/2022] [Indexed: 11/10/2022] Open
Abstract
Sialic acid immunoglobulin-like lectin E (Siglec-E) is a subtype of pattern recognition receptors found on the surface of myeloid cells and functions as a key immunosuppressive checkpoint molecule. The engagement between Siglec-E and the ligand α2,8-linked disialyl glycans activates the immunoreceptor tyrosine-based inhibitory motif (ITIM) in its intracellular domain, mitigating the potential risk of autoimmunity amid innate immune attacks on parasites, bacteria, and carcinoma. Recent studies suggest that Siglec-E is also expressed in the CNS, particularly microglia, the brain-resident immune cells. However, the functions of Siglec-E in brain inflammation and injuries under many neurological conditions largely remain elusive. In this study, we first revealed an anti-inflammatory role for Siglec-E in lipopolysaccharide (LPS)-triggered microglial activation. We then found that Siglec-E was induced within the brain by systemic treatment with LPS in mice in a dose-dependent manner, while its ablation exacerbated hippocampal reactive microgliosis in LPS-treated animals. The genetic deficiency of Siglec-E also aggravated oxygen-glucose deprivation (OGD)-induced neuronal death in mouse primary cortical cultures containing both neurons and glial cells. Moreover, Siglec-E expression in ipsilateral brain tissues was substantially induced following middle cerebral artery occlusion (MCAO). Lastly, the neurological deficits and brain infarcts were augmented in Siglec-E knockout mice after moderate MCAO when compared to wild-type animals. Collectively, our findings suggest that the endogenous inducible Siglec-E plays crucial anti-inflammatory and neuroprotective roles following ischemic stroke, and thus might underlie an intrinsic mechanism of resolution of inflammation and self-repair in the brain.
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Affiliation(s)
- Lexiao Li
- Department of Pharmaceutical Sciences, Drug Discovery Center, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Yu Chen
- Department of Pharmaceutical Sciences, Drug Discovery Center, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Madison N Sluter
- Department of Pharmaceutical Sciences, Drug Discovery Center, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Ruida Hou
- Department of Pharmaceutical Sciences, Drug Discovery Center, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Jiukuan Hao
- Department of Pharmacological and Pharmaceutical Sciences, College of Pharmacy, University of Houston, Houston, TX, USA
| | - Yin Wu
- Children's Foundation Research Institute at Le Bonheur Children's Hospital, Department of Pediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Guo-Yun Chen
- Children's Foundation Research Institute at Le Bonheur Children's Hospital, Department of Pediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Ying Yu
- Department of Pharmaceutical Sciences, Drug Discovery Center, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Jianxiong Jiang
- Department of Pharmaceutical Sciences, Drug Discovery Center, College of Pharmacy, University of Tennessee Health Science Center, Memphis, TN, USA.
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Wu Y, Yang D, Chen GY. Targeted disruption of Rab1a causes early embryonic lethality. Int J Mol Med 2022; 49:46. [PMID: 35137917 PMCID: PMC8846934 DOI: 10.3892/ijmm.2022.5101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 01/19/2022] [Indexed: 11/06/2022] Open
Abstract
Guanosine nucleotide diphosphate (GDP) dissociation inhibitor 2 (GDI2) regulates the GDP/guanosine triphosphate (GTP) exchange reaction of Rab proteins by inhibiting the dissociation of GDP and the subsequent binding of GTP. The present study aimed to determine the function of Rab1a in vivo, and thus generated mice with a trapped Rab1a gene. It was demonstrated that Rab1a is essential for embryonic development. It was also found that one functional Rab1a allele was sufficient for development in a heterozygous murine embryo, whereas a double mutant led to embryonic lethality. The dissection of uteri on embryonic day (E)10.5‑14.5 yielded no homozygous embryos, indicating that homozygotes die between E10.5 to E11.5. The gene trap construct contains a β‑galactosidase/neomycin reporter gene, allowing for heterozygotes to be stained for β‑galactosidase to determine the tissue‑specific expression of Rab1a. Rab1a was found to be highly expressed in the small intestine of both adult mice and embryos, although its expression levels were low in the brains of embryos. Moreover, there was no significant change in cytokine production and survival in wild‑type and heterozygous Rab1a+/‑ mice following a challenge with lipopolysaccharide. On the whole, the present study demonstrates that the disruption of the Rab1a gene causes embryonic lethality and homozygotes die between E10.5 and E11.5, suggesting that Rab1a is essential for the early development of mouse embryos.
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Affiliation(s)
- Yin Wu
- Children's Foundation Research Institute at Le Bonheur Children's Hospital, Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38103, USA
| | - Darong Yang
- Children's Foundation Research Institute at Le Bonheur Children's Hospital, Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38103, USA
| | - Guo-Yun Chen
- Children's Foundation Research Institute at Le Bonheur Children's Hospital, Department of Pediatrics, University of Tennessee Health Science Center, Memphis, TN 38103, USA
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Karmakar J, Mukherjee K, Mandal C. Siglecs Modulate Activities of Immune Cells Through Positive and Negative Regulation of ROS Generation. Front Immunol 2021; 12:758588. [PMID: 34804046 PMCID: PMC8595208 DOI: 10.3389/fimmu.2021.758588] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2021] [Accepted: 10/18/2021] [Indexed: 12/13/2022] Open
Abstract
Reactive oxygen species (ROS) are a group of oxygen-containing highly-reactive molecules produced from oxidative metabolic processes or in response to intracellular signals like cytokines and external stimuli like pathogen attack. They regulate a range of physiological processes and are involved in innate immune responses against infectious agents. Deregulation of ROS contributes to a plethora of disease conditions. Sialic acids are carbohydrates, present on cell surfaces or soluble proteins. Sialic acid-binding immunoglobulin-like lectins (Siglecs) recognize and bind to sialic acids. These are widely expressed on various types of immune cells. Siglecs modulate immune activation and can promote or inhibit ROS generation under different contexts. Siglecs promote ROS-dependent cell death in neutrophils and eosinophils while limiting oxidative stress associated with chronic obstructive pulmonary disease (COPD), sickle cell disease (SCD), coronavirus disease-2019 (COVID-19), etc. This review distinguishes itself in summarizing the current understanding of the role of Siglecs in moderating ROS production and their distinct effect on different immune cells; that ultimately determine the cellular response and the disease outcome. This is an important field of investigation having scope for both expansion and medical importance.
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Affiliation(s)
| | | | - Chitra Mandal
- Cancer Biology and Inflammatory Disorder Division, Council of Scientific and Industrial Research (CSIR)-Indian Institute of Chemical Biology, Kolkata, India
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