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Li LY, Zhou YT, Sun L, Liu XY, Li J, Hong Y, Ye XY, Bao Q, Meng QX, Wen WP, Chen HX, Li CW. Downregulation of MCM2 contributes to the reduced growth potential of epithelial progenitor cells in chronic nasal inflammation. J Allergy Clin Immunol 2020; 147:1966-1973.e3. [PMID: 33279575 DOI: 10.1016/j.jaci.2020.11.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 07/05/2020] [Revised: 10/15/2020] [Accepted: 11/10/2020] [Indexed: 01/09/2023]
Abstract
BACKGROUND Recent studies have shown that human nasal epithelial progenitor cells (hNEPCs) are characterized by poor proliferation capacities during chronic nasal inflammation. OBJECTIVE We sought to investigate the key molecular functions and candidates that contribute to the reduced growth potential of hNEPCs in chronically inflamed nasal mucosa. METHODS Nasal biopsy specimens were obtained from 28 patients with nasal polyps (NPs) and 13 healthy controls. hNEPCs from nasal samples were cultured for 3 consecutive passages, and their molecular and functional profiles were analyzed by RNA sequencing. The minichromosome maintenance protein (MCM) family gene MCM2 was validated in hNEPCs and tissue samples from patients with NPs and control subjects by cell cycle, quantitative PCR, and Western blot analyses; small interfering RNA-mediated knockdown assay; and immunofluorescent staining. RESULTS Compared with control hNEPCs, NP-derived hNEPCs showed (1) reduced growth kinetics, as evidenced by the colony-forming efficiency and doubling time; (2) inhibited cell cycle progression, as evidenced by gene ontology and/or pathway and cell cycle analyses; and (3) downregulated expression of MCM2, the key protein of the MCM complex, which is critical for DNA replication at the G1/S checkpoint. Moreover, hNEPCs with MCM2 knockdown showed a decreased proliferation rate, and the MCM2 protein level in basal cells was significantly lower in abnormally remodeled nasal epithelium than in normal epithelium. CONCLUSION These results demonstrate inhibited cell cycle progression and MCM2 downregulation in basal or progenitor nasal epithelial cells from NP tissue, which may contribute to the decreased growth potential of hNEPCs in chronically inflamed upper airways.
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Affiliation(s)
- Li Yue Li
- Department of Otolaryngology, Guangzhou Key Laboratory of Otorhinolaryngology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Yu Tao Zhou
- Department of Otolaryngology, Guangzhou Key Laboratory of Otorhinolaryngology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Lin Sun
- Department of Otolaryngology, Guangzhou Key Laboratory of Otorhinolaryngology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Xin Yi Liu
- Center for Stem Cell Biology and Tissue Engineering, Key Laboratory for Stem Cells and Tissue Engineering, Ministry of Education, Sun Yat-Sen University, Guangzhou, China
| | - Jian Li
- Department of Otolaryngology, Guangzhou Key Laboratory of Otorhinolaryngology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Yue Hong
- School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Xiao Yan Ye
- Department of Otolaryngology, Guangzhou Key Laboratory of Otorhinolaryngology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Qing Bao
- Department of Otolaryngology, Guangzhou Key Laboratory of Otorhinolaryngology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Qing Xiang Meng
- Department of Otorhinolaryngology Head and Neck Surgery, Guangzhou First People's Hospital, Guangzhou, China
| | - Wei Ping Wen
- Department of Otolaryngology, Guangzhou Key Laboratory of Otorhinolaryngology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - He Xin Chen
- Department of Otolaryngology, Guangzhou Key Laboratory of Otorhinolaryngology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China
| | - Chun Wei Li
- Department of Otolaryngology, Guangzhou Key Laboratory of Otorhinolaryngology, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, China.
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