1
|
Li Q, Zhang W, Qiao XY, Liu C, Dao JJ, Qiao CM, Cui C, Shen YQ, Zhao WJ. Reducing polypyrimidine tract‑binding protein 1 fails to promote neuronal transdifferentiation on HT22 and mouse astrocyte cells under physiological conditions. Exp Ther Med 2024; 27:72. [PMID: 38234625 PMCID: PMC10792410 DOI: 10.3892/etm.2023.12360] [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: 09/01/2023] [Accepted: 11/27/2023] [Indexed: 01/19/2024] Open
Abstract
In contrast to prior findings that have illustrated the conversion of non-neuronal cells into functional neurons through the specific targeting of polypyrimidine tract-binding protein 1 (PTBP1), accumulated evidence suggests the impracticality of inducing neuronal transdifferentiation through suppressing PTBP1 expression in pathological circumstances. Therefore, the present study explored the effect of knocking down PTBP1 under physiological conditions on the transdifferentiation of mouse hippocampal neuron HT22 cells and mouse astrocyte (MA) cells. A total of 20 µM negative control small interfering (si)RNA and siRNA targeting PTBP1 were transfected into HT22 and MA cells using Lipo8000™ for 3 and 5 days, respectively. The expression of early neuronal marker βIII-Tubulin and mature neuronal markers NeuN and microtubule-associated protein 2 (MAP2) were detected using western blotting. In addition, βIII-tubulin, NeuN and MAP2 were labeled with immunofluorescence staining to evaluate neuronal cell differentiation in response to PTBP1 downregulation. Under physiological conditions, no significant changes in the expression of βIII-Tubulin, NeuN and MAP2 were found after 3 and 5 days of knockdown of PTBP1 protein in both HT22 and MA cells. In addition, the immunofluorescence staining results showed no apparent transdifferentiation in maker levels and morphology. The results suggested that the knockdown of PTBP1 failed to induce neuronal differentiation under physiological conditions.
Collapse
Affiliation(s)
- Qian Li
- Department of Cell Biology, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Wei Zhang
- Department of Cell Biology, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
- Department of Pathogen Biology, Guizhou Nursing Vocational College, Guiyang, Guizhou 550081, P.R. China
| | - Xin-Yu Qiao
- Department of Cell Biology, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Chong Liu
- Department of Cell Biology, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Ji-Ji Dao
- Department of Cell Biology, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Chen-Meng Qiao
- Department of Neurodegeneration and Neuroinjury, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Chun Cui
- Department of Neurodegeneration and Neuroinjury, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Yan-Qin Shen
- Department of Neurodegeneration and Neuroinjury, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| | - Wei-Jiang Zhao
- Department of Cell Biology, Wuxi School of Medicine, Jiangnan University, Wuxi, Jiangsu 214122, P.R. China
| |
Collapse
|
2
|
Liu HL, Lu XM, Wang HY, Hu KB, Wu QY, Liao P, Li S, Long ZY, Wang YT. The role of RNA splicing factor PTBP1 in neuronal development. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2023; 1870:119506. [PMID: 37263298 DOI: 10.1016/j.bbamcr.2023.119506] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 05/23/2023] [Accepted: 05/26/2023] [Indexed: 06/03/2023]
Abstract
Alternative pre-mRNA splicing, which produces various mRNA isoforms with distinct structures and functions from a single gene, is regulated by specific RNA-binding proteins and is an essential method for regulating gene expression in mammals. Recent studies have shown that abnormal change during neuronal development triggered by splicing mis-regulation is an important feature of various neurological diseases. Polypyrimidine tract binding protein 1 (PTBP1) is a kind of RNA-binding proteins with extensive biological functions. As a well-known splicing regulator, it affects the neuronal development process through its involvement in axon formation, synaptogenesis, and neuronal apoptosis, according to the most recent studies. Here, we summarized the mechanism of alternative splicing, structure and function of PTBP1, and the latest research progress on the role of alternative splicing events regulated by PTBP1 in axon formation, synaptogenesis and neuronal apoptosis, to reveal the mechanism of PTBP1-regulated changes in neuronal development process.
Collapse
Affiliation(s)
- Hui-Lin Liu
- College of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing 400054, PR China; State Key Laboratory of Trauma, Burns and Combined Injury, Daping Hospital, Army Medical University, Chongqing 400042, PR China
| | - Xiu-Min Lu
- College of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing 400054, PR China
| | - Hai-Yan Wang
- State Key Laboratory of Trauma, Burns and Combined Injury, Daping Hospital, Army Medical University, Chongqing 400042, PR China
| | - Kai-Bin Hu
- College of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing 400054, PR China
| | - Qing-Yun Wu
- College of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing 400054, PR China
| | - Ping Liao
- College of Pharmacy and Bioengineering, Chongqing University of Technology, Chongqing 400054, PR China
| | - Sen Li
- State Key Laboratory of Trauma, Burns and Combined Injury, Daping Hospital, Army Medical University, Chongqing 400042, PR China
| | - Zai-Yun Long
- State Key Laboratory of Trauma, Burns and Combined Injury, Daping Hospital, Army Medical University, Chongqing 400042, PR China
| | - Yong-Tang Wang
- State Key Laboratory of Trauma, Burns and Combined Injury, Daping Hospital, Army Medical University, Chongqing 400042, PR China.
| |
Collapse
|
3
|
Ju Z, Pan H, Qu C, Xiao L, Zhou M, Wang Y, Luo J, Shen L, Zhou P, Huang R. Lactobacillus rhamnosus GG ameliorates radiation-induced lung fibrosis via lncRNASNHG17/PTBP1/NICD axis modulation. Biol Direct 2023; 18:2. [PMID: 36635762 PMCID: PMC9835385 DOI: 10.1186/s13062-023-00357-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 01/03/2023] [Indexed: 01/13/2023] Open
Abstract
Radiation-induced pulmonary fibrosis (RIPF) is a major side effect experienced for patients with thoracic cancers after radiotherapy. RIPF is poor prognosis and limited therapeutic options available in clinic. Lactobacillus rhamnosus GG (LGG) is advantaged and widely used for health promotion. However. Whether LGG is applicable for prevention of RIPF and relative underlying mechanism is poorly understood. Here, we reported a unique comprehensive analysis of the impact of LGG and its' derived lncRNA SNHG17 on radiation-induced epithelial-mesenchymal transition (EMT) in vitro and RIPF in vivo. As revealed by high-throughput sequencing, SNHG17 expression was decreased by LGG treatment in A549 cells post radiation and markedly attenuated the radiation-induced EMT progression (p < 0.01). SNHG17 overexpression correlated with poor overall survival in patients with lung cancer. Mechanistically, SNHG17 can stabilize PTBP1 expression through binding to its 3'UTR, whereas the activated PTBP1 can bind with the NICD part of Notch1 to upregulate Notch1 expression and aggravated EMT and lung fibrosis post radiation. However, SNHG17 knockdown inhibited PTBP1 and Notch1 expression and produced the opposite results. Notably, A549 cells treated with LGG also promoted cell apoptosis and increased cell G2/M arrest post radiation. Mice of RIPF treated with LGG decreased SNHG17 expression and attenuated lung fibrosis. Altogether, these data reveal that modulation of radiation-induced EMT and lung fibrosis by treatment with LGG associates with a decrease in SNHG17 expression and the inhibition of SNHG17/PTBP1/Nothch1 axis. Collectively, our results indicate that LGG exerts protective effects in RIPF and SNHG17 holds a potential marker of RIPF recovery in patients with thoracic cancers.
Collapse
Affiliation(s)
- Zhao Ju
- grid.216417.70000 0001 0379 7164Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha, 410078 Hunan Province China ,grid.410740.60000 0004 1803 4911Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, AMMS, Beijing, China
| | - Huiji Pan
- grid.216417.70000 0001 0379 7164Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha, 410078 Hunan Province China
| | - Can Qu
- grid.216417.70000 0001 0379 7164Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha, 410078 Hunan Province China
| | - Liang Xiao
- grid.73113.370000 0004 0369 1660Faculty of Naval Medicine, Naval Medical University (Second Military Medical University), Shanghai, 200433 China
| | - Meiling Zhou
- grid.216417.70000 0001 0379 7164Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha, 410078 Hunan Province China ,grid.410740.60000 0004 1803 4911Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, AMMS, Beijing, China
| | - Yin Wang
- grid.216417.70000 0001 0379 7164Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha, 410078 Hunan Province China
| | - Jinhua Luo
- grid.216417.70000 0001 0379 7164Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha, 410078 Hunan Province China
| | - Liangfang Shen
- grid.216417.70000 0001 0379 7164Department of Oncology, Xiangya Hospital, Central South University, Changsha, China
| | - Pingkun Zhou
- grid.410740.60000 0004 1803 4911Department of Radiation Biology, Beijing Key Laboratory for Radiobiology, Beijing Institute of Radiation Medicine, AMMS, Beijing, China
| | - Ruixue Huang
- Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha, 410078, Hunan Province, China.
| |
Collapse
|
4
|
Li Y, Chen X, Huang H, Liao L, Chong H, Li G, Yuan T, Lu W, Deng S, Huang Q. A feedback loop between NONHSAT024276 and PTBP1 inhibits tumor progression and glycolysis in HCC by increasing the PKM1/PKM2 ratio. Cancer Sci 2022; 114:1519-1540. [PMID: 36529521 PMCID: PMC10067414 DOI: 10.1111/cas.15697] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 12/03/2022] [Accepted: 12/09/2022] [Indexed: 12/23/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is one of the most common malignancies with a hallmark of aberrant metabolism. The mechanism of long noncoding RNAs (lncRNAs) underlying the aggressive behaviors and glycolysis of HCC is poorly understood. In this study, we identified, via microarray, novel lncRNA NONHSAT024276 as a potential tumor suppressor in HCC. The downregulation of NONHSAT024276 closely correlated with larger tumor volume and higher aspartate transaminase levels. Functional experiments were performed to verify the role of NONHSAT024276 in HCC progression, and the negative effects of NONHSAT024276 expression on cell proliferation and migration were identified. Mechanistically, NONHSAT024276 directly bound to polypyrimidine tract-binding protein 1 (PTBP1), downregulating it and forming a feedback loop. Furthermore, NONHSAT024276 increased the ratio of M1 and M2 isoforms of pyruvate kinase (PKM1/PKM2) and also obstructed the PTBP1/PKM-mediated glycolysis. Finally, the rescue assays confirmed that NONHSAT024276 functioned in HCC via downregulating PTBP1 to increase the PKM1/PKM2 ratio. Hence, this study supported a model in which NONHSAT024276 downregulated PTBP1 and formed a feedback loop to increase the PKM1/PKM2 ratio to inhibit glycolysis and progression of HCC, opening new prospects for preventing or treating HCC.
Collapse
Affiliation(s)
- Yuwei Li
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Xia Chen
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Hengliu Huang
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Ling Liao
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Huimin Chong
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Guangyao Li
- Department of Hepatobiliary Surgery, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Tao Yuan
- Department of Hepatobiliary Surgery, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Weiping Lu
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Shaoli Deng
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Qing Huang
- Department of Laboratory Medicine, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| |
Collapse
|