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Kou R, Li T, Fu C, Jiang D, Wang Y, Meng J, Zhong R, Liang C, Dong M. Exosome-shuttled FTO from BM-MSCs contributes to cancer malignancy and chemoresistance in acute myeloid leukemia by inducing m6A-demethylation: A nano-based investigation. ENVIRONMENTAL RESEARCH 2024; 244:117783. [PMID: 38048862 DOI: 10.1016/j.envres.2023.117783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 11/09/2023] [Accepted: 11/23/2023] [Indexed: 12/06/2023]
Abstract
Although bone marrow mesenchymal stem cells (BM-MSCs)-derived exosomes have been reported to be closely associated with acute myeloid leukemia (AML) progression and chemo-resistance, but its detailed functions and molecular mechanisms have not been fully delineated. Besides, serum RNA m6A demethylase fat mass and obesity-associated protein (FTO)-containing exosomes are deemed as important indicators for cancer progression, and this study aimed to investigate the role of BM-MSCs-derived FTO-exosomes in regulating the malignant phenotypes of AML cells. Here, we verified that BM-MSCs-derived exosomes delivered FTO to promote cancer aggressiveness, stem cell properties and Cytosine arabinoside (Ara-C)-chemoresistance in AML cells, and the underlying mechanisms were also uncovered. Our data suggested that BM-MSCs-derived FTO-exo demethylated m6A modifications in the m6A-modified LncRNA GLCC1 to facilitate its combination with the RNA-binding protein Hu antigen R (HuR), which further increased the stability and expression levels of LncRNA GLCC1. In addition, LncRNA GLCC1 was verified as an oncogene to facilitate cell proliferation and enhanced Ara-C-chemoresistance in AML cells. Further experiments confirmed that demethylated LncRNA GLCC1 served as scaffold to facilitate the formation of the IGF2 mRNA binding protein 1 (IGF2BP1)-c-Myc complex, which led to the activation of the downstream tumor-promoting c-Myc-associated signal pathways. Moreover, our rescuing experiments validated that the promoting effects of BM-MSCs-derived FTO-exo on cancer aggressiveness and drug resistance in AML cells were abrogated by silencing LncRNA GLCC1 and c-Myc. Thus, the present firstly investigated the functions and underlying mechanisms by which BM-MSCs-derived FTO-exo enhanced cancer aggressiveness and chemo-resistance in AML by modulating the LncRNA GLCC1-IGF2BP1-c-Myc signal pathway, and our work provided novel biomarkers for the diagnosis, treatment and therapy of AML in clinic.
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Affiliation(s)
- Ruirui Kou
- Department of Hematology, The Second Affiliated Hospital of Hainan Medical College, Yehai Road No. 368, Longhua District, Haikou, 570000, Hainan Province, China.
| | - Tian Li
- School of Basic Medicine, Fourth Military Medical University, Xi'an 710032, China.
| | - Caizhu Fu
- Department of Hematology, The Second Affiliated Hospital of Hainan Medical College, Yehai Road No. 368, Longhua District, Haikou, 570000, Hainan Province, China.
| | - Duanfeng Jiang
- Department of Hematology, The Second Affiliated Hospital of Hainan Medical College, Yehai Road No. 368, Longhua District, Haikou, 570000, Hainan Province, China.
| | - Yue Wang
- Department of Pharmacology and Toxicology, Wright State University, USA.
| | - Jie Meng
- Department of Hematology, The Second Affiliated Hospital of Hainan Medical College, Yehai Road No. 368, Longhua District, Haikou, 570000, Hainan Province, China.
| | - Ruilan Zhong
- Department of Hematology, The Second Affiliated Hospital of Hainan Medical College, Yehai Road No. 368, Longhua District, Haikou, 570000, Hainan Province, China.
| | - Changjiu Liang
- Department of Hematology, The Second Affiliated Hospital of Hainan Medical College, Yehai Road No. 368, Longhua District, Haikou, 570000, Hainan Province, China.
| | - Min Dong
- Department of Hematology, The Second Affiliated Hospital of Hainan Medical College, Yehai Road No. 368, Longhua District, Haikou, 570000, Hainan Province, China.
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