1
|
Sun L, Wan J, Sun B, Tian Q, Li M, Xu LX, Feng CX, Tong X, Feng X, Yang X, Ding X. LncRNA-mir3471- limd1 regulatory network plays critical roles in HIBD. Exp Brain Res 2024; 242:443-449. [PMID: 38147087 PMCID: PMC10806112 DOI: 10.1007/s00221-023-06755-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 11/11/2023] [Indexed: 12/27/2023]
Abstract
The purpose of this study was to identify the target genes of tcon_00044595, elucidate its activation site, and provide novel insights into the pathogenesis and treatment of neonatal hypoxic-ischemic brain damage (HIBD). Through homologous blast analysis, we identified predicted target sequences in the neighboring regions of the long non-coding RNA (lncRNA) tcon_00044595, suggesting that limd1 is its target gene. Starbase was utilized to identify potential candidate microRNAs associated with the lncRNA. The interaction between the candidate microRNAs and limd1 was investigated and validated using various experimental methods including in vitro cell culture, cell transfection, dual fluorescence reporter detection system, and real-time PCR. Homology alignment analysis revealed that the lncRNA tcon_00044595 exhibited a 246 bp homologous sequence at the 3' end of the adjacent limd1 gene, with a conservation rate of 68%. Analysis conducted on Starbase online identified three potential microRNA candidates: miR-3471, miR-883a-5p, and miR-214-3p. Intracellular expression of the limd1 gene was significantly down-regulated upon transfection with miR-3471, while the other two microRNAs did not produce noticeable effects. Luciferase reporter assays identified two interaction sites (UTR-1, UTR-2) between miR-3471 and the limd1 3'UTR, with UTR-1 exhibiting a strong influence. Further CCK8 assay indicated a protective role of miR-3471 during low oxygen stroke in HIBD. The potential regulatory relationship between lncRNA (tcon_00044595), miR-3471, and the target gene limd1 suggests their involvement in the occurrence and development of HIBD, providing new insights for investigating the underlying mechanisms and exploring targeted therapeutic approaches for HIBD.
Collapse
Affiliation(s)
- Li Sun
- Soochow Key Laboratory of Prevention and Treatment of Child Brain Injury;, Children's Hospital of Soochow University, Suzhou, 215025, China
| | - Jun Wan
- Soochow Key Laboratory of Prevention and Treatment of Child Brain Injury;, Children's Hospital of Soochow University, Suzhou, 215025, China
- Department of Pediatrics, Affiliated Hospital of Jiangnan University, Wuxi, China
| | - Bin Sun
- Department of Neonatology, Children's Hospital of Soochow University, No.92 Zhongnanjie Road, Suzhou, 215025, Jiangsu, China
| | - Qiuyan Tian
- Soochow Key Laboratory of Prevention and Treatment of Child Brain Injury;, Children's Hospital of Soochow University, Suzhou, 215025, China
| | - Mei Li
- Pediatrics Research Institute, Children's Hospital of Soochow University, Suzhou, 215025, China
| | - Li-Xiao Xu
- Pediatrics Research Institute, Children's Hospital of Soochow University, Suzhou, 215025, China
| | - Chen-Xi Feng
- Pediatrics Research Institute, Children's Hospital of Soochow University, Suzhou, 215025, China
| | - Xiao Tong
- Department of Pediatrics, Affiliated Hospital of Jiangnan University, Wuxi, China
| | - Xing Feng
- Soochow Key Laboratory of Prevention and Treatment of Child Brain Injury;, Children's Hospital of Soochow University, Suzhou, 215025, China
| | - Xiaofeng Yang
- Soochow Key Laboratory of Prevention and Treatment of Child Brain Injury;, Children's Hospital of Soochow University, Suzhou, 215025, China.
- Department of Neonatology, Children's Hospital of Soochow University, No.92 Zhongnanjie Road, Suzhou, 215025, Jiangsu, China.
| | - Xin Ding
- Soochow Key Laboratory of Prevention and Treatment of Child Brain Injury;, Children's Hospital of Soochow University, Suzhou, 215025, China.
- Department of Neonatology, Children's Hospital of Soochow University, No.92 Zhongnanjie Road, Suzhou, 215025, Jiangsu, China.
| |
Collapse
|
2
|
Foxler DE, James V, Shelton SJ, Vallim TQDA, Shaw PE, Sharp TV. PU.1 is a major transcriptional activator of the tumour suppressor gene LIMD1. FEBS Lett 2011; 585:1089-96. [PMID: 21402070 PMCID: PMC3078326 DOI: 10.1016/j.febslet.2011.03.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2010] [Revised: 02/24/2011] [Accepted: 03/07/2011] [Indexed: 12/30/2022]
Abstract
LIMD1 is a tumour suppressor gene (TSG) down regulated in ∼80% of lung cancers with loss also demonstrated in breast and head and neck squamous cell carcinomas. LIMD1 is also a candidate TSG in childhood acute lymphoblastic leukaemia. Mechanistically, LIMD1 interacts with pRB, repressing E2F-driven transcription as well as being a critical component of microRNA-mediated gene silencing. In this study we show a CpG island within the LIMD1 promoter contains a conserved binding motif for the transcription factor PU.1. Mutation of the PU.1 consensus reduced promoter driven transcription by 90%. ChIP and EMSA analysis demonstrated that PU.1 specifically binds to the LIMD1 promoter. siRNA depletion of PU.1 significantly reduced endogenous LIMD1 expression, demonstrating that PU.1 is a major transcriptional activator of LIMD1.
Collapse
Affiliation(s)
- Daniel E. Foxler
- School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 1UH, UK
| | - Victoria James
- School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 1UH, UK
| | - Samuel J. Shelton
- School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 1UH, UK
| | - Thomas Q. de A. Vallim
- Department of Biological Chemistry, University of California Los Angeles, David Geffen School of Medicine, Los Angeles, CA 90095, United States,Department of Cardiology, University of California Los Angeles, David Geffen School of Medicine, Los Angeles, CA 90095, United States
| | - Peter E. Shaw
- School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 1UH, UK
| | - Tyson V. Sharp
- School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 1UH, UK,Corresponding author.
| |
Collapse
|