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Yang J, Xie Y, Xia Z, Ji S, Yang X, Yue D, Liu Y, Yang R, Fan Y. HucMSC-Exo Induced N2 Polarization of Neutrophils: Implications for Angiogenesis and Tissue Restoration in Wound Healing. Int J Nanomedicine 2024; 19:3555-3575. [PMID: 38638364 PMCID: PMC11024985 DOI: 10.2147/ijn.s458295] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Accepted: 04/10/2024] [Indexed: 04/20/2024] Open
Abstract
Background Neutrophils rapidly accumulate in large numbers at sites of tissue damage, exhibiting not only their well-known bactericidal capabilities but also playing crucial roles in angiogenesis and tissue repair. While exosomes derived from human umbilical cord mesenchymal stem cells (HucMSC-Exo) have emerged as a promising therapeutic tool, their exact mechanisms of action remain partly elusive. We hypothesize that HucMSC-Exo treatment may modulate neutrophil phenotypes, thereby significantly influencing wound healing outcomes. Methods HucMSC-Exo were isolated via ultracentrifugation and subsequently administered through subcutaneous injection into full-thickness cutaneous wounds in mice. To determine the impact of host neutrophils on the healing effects of HucMSC-Exo in skin injuries, strategies including neutrophil depletion and adoptive transfer were employed. Flow cytometry was used to evaluate the proportion of N2 subtype neutrophils in both normal and diabetic wounds, and the effect of HucMSC-Exo on this proportion was assessed. Furthermore, the mitochondrial metabolic reprogramming driven by HucMSC-Exo during N2 polarization was investigated through JC1 staining, ATP quantification, fatty acid uptake assays, and assessment of FAO-related genes (Cpt1b, Acadm, and Acadl). Results Depleting host neutrophils strikingly dampened prohealing effect of HucMSC-Exo on skin injury, while adoptive transfer of bone marrow neutrophils rescued this process. During normal healing process, some neutrophils expressed N2 markers, in contrast, diabetic wounds exhibited a reduced expression of N2 markers. After treatment with HucMSC-Exo, most neutrophils increased the phosphorylation of STAT6, leading to mitochondrial metabolic reprogramming and thus acquired an N2 phenotype. These N2 neutrophils, polarized by HucMSC-Exo, boosted the release of proangiogenic factors, particularly BV8, a myeloid cell-derived proangiogenic factor, and induced angiogenesis thereby favoring tissue restoration. Conclusion This research uniquely demonstrates the identification of N2 neutrophils in skin injury and shows that HucMSC-Exo could skew neutrophils toward N2 phenotype, enhancing our insight into how cells react to HucMSC-Exo.
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Affiliation(s)
- Jiaman Yang
- Department of Dermatology, the Seventh Medical Center of Chinese PLA General Hospital, Beijing, 100700, People’s Republic of China
- The Second School of Clinical Medicine, SouThern Medical University, Guangzhou, 510599, People’s Republic of China
| | - Yulin Xie
- Department of Dermatology, the Seventh Medical Center of Chinese PLA General Hospital, Beijing, 100700, People’s Republic of China
- The Second School of Clinical Medicine, SouThern Medical University, Guangzhou, 510599, People’s Republic of China
| | - Zhikuan Xia
- Department of Dermatology, the Seventh Medical Center of Chinese PLA General Hospital, Beijing, 100700, People’s Republic of China
| | - Shuaifei Ji
- Chinese PLA Medical School, Beijing, 100853, People’s Republic of China
| | - Xin Yang
- Department of Dermatology, the Seventh Medical Center of Chinese PLA General Hospital, Beijing, 100700, People’s Republic of China
| | - Danxia Yue
- Department of Dermatology, the Seventh Medical Center of Chinese PLA General Hospital, Beijing, 100700, People’s Republic of China
| | - Yuanyuan Liu
- Department of Dermatology, the Seventh Medical Center of Chinese PLA General Hospital, Beijing, 100700, People’s Republic of China
- Chinese PLA Medical School, Beijing, 100853, People’s Republic of China
| | - Rongya Yang
- Department of Dermatology, the Seventh Medical Center of Chinese PLA General Hospital, Beijing, 100700, People’s Republic of China
- The Second School of Clinical Medicine, SouThern Medical University, Guangzhou, 510599, People’s Republic of China
- Chinese PLA Medical School, Beijing, 100853, People’s Republic of China
| | - Yunlong Fan
- Department of Dermatology, the Seventh Medical Center of Chinese PLA General Hospital, Beijing, 100700, People’s Republic of China
- Chinese PLA Medical School, Beijing, 100853, People’s Republic of China
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Li L, Zhang X, Chen Y. Human Umbilical Cord Mesenchymal Stem Cell Exosome-derived miR-335-5p Alleviated Lipopolysaccharide-induced Acute Lung Injury by Regulating the m6A Level of ITGβ4 Gene. Curr Med Chem 2024; 31:CMC-EPUB-137488. [PMID: 38310394 DOI: 10.2174/0109298673273833231220062213] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 10/27/2023] [Accepted: 11/16/2023] [Indexed: 02/05/2024]
Abstract
BACKGROUND Acute lung injury (ALI) is a serious complication that may accompany severe pneumonia in children. Derived from exosomes of human umbilical cord mesenchymal stem cell exosome (HucMSC-Exo) can contribute to the regeneration of damaged lung tissue. This study aims to investigate the impact of HucMSC-Exo on ALI and its potential mechanisms. METHODS Firstly, RT-qPCR was performed to assess the expression of miR-335-5p. Subsequently, Pearson correlation analysis was performed to examine the correlation between METTL14 and miR-335-5p, as well as the correlation between METTL14 and ITGB4., while RNA immunoprecipitation (RIP) was used to determine the m6A modification level of ITGβ4. Additionally, molecular biology techniques were employed to evaluate the expression of glycolysis-related factors. Definitively, an LPS-induced ALI model was established to investigate the effect of miR-335-5p on mice lung tissue. RESULTS miR-335-5p was found to be highly expressed in HucMSC-Exo. Transfection with miR-335-5p mimics resulted in increased glucose uptake. Pearson correlation analysis revealed a negative correlation between METTL14 and miR-335-5p, as well as between METTL14 and ITGβ4. The m6A level of ITGβ4 was elevated in ALI. Overexpression of METTL14 was found to reduce the expression and glucose uptake of ITGβ4, while overexpression of ITGβ4 reversed the effects of METTL14 overexpression. in vivo, results demonstrated that miR-335-5p can improve the extent of lung tissue lesions and reduce glycolytic levels. CONCLUSION This study reveals the mechanism by which miR-335-5p derived from HucMSC-Exo could alleviate LPS-induced ALI by regulating the m6A modification of ITGβ4, providing a new direction for the treatment of ALI.
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Affiliation(s)
- Linrui Li
- Department of Respiratory Medicine, Hunan Children's Hospital, Changsha, 410006, China
| | - Xi Zhang
- Department of Respiratory Medicine, Hunan Children's Hospital, Changsha, 410006, China
| | - Yanping Chen
- Department of Respiratory Medicine, Hunan Children's Hospital, Changsha, 410006, China
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