2. Academic Validation
  3. EGR1 mediates METTL3/m6A/CHI3L1 to promote osteoclastogenesis in osteoporosis

EGR1 mediates METTL3/m6A/CHI3L1 to promote osteoclastogenesis in osteoporosis

  • Genomics. 2023 Aug 7;110696. doi: 10.1016/j.ygeno.2023.110696.
Changsheng Wang 1,  Xiaobo Zhang 2,  Rongsheng Chen 2,  Xitian Zhu 2,  Nancheng Lian 2
Affiliations

Affiliations

  • 1 Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, PR China. Electronic address: wangchangsheng085@163.com.
  • 2 Department of Spinal Surgery, First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian 350005, PR China.
PMID: 37558013 DOI: 10.1016/j.ygeno.2023.110696
Abstract

Objective: To investigate EGR1-mediated METTL3/m6A/CHI3L1 axis in osteoporosis.

Methods: Ovariectomy (OVX) was performed on mice to induce osteoporosis, followed by μ-CT scanning of femurs, histological staining, immunohistochemistry analysis of MMP9 and NFATc1, and ELISA of serum BGP, ALP, CA, and CTXI. The isolated mouse bone marrow mononuclear macrophages (BMMs) were differentiated into osteoclasts under cytokine stimulation. TRAP staining was performed to quantify osteoclasts. The levels of Nfatc1, c-Fos, ACP5, and Ctsk in osteoclasts, m6A level, and the relationships among EGR1, METTL3, and CHI3L1 were analyzed.

Results: The EGR1/METTL3/CHI3L1 levels and m6A level were upregulated in osteoporotic mice and the derived BMMs. EGR1 was a transcription factor of METTL3. METTL3 promoted the post-transcriptional regulation of CHI3L1 by increasing m6A methylation. EGR1 downregulation reduced BMMs-differentiated osteoclasts and alleviated OVX-induced osteoporosis by regulating the METTL3/m6A/CHI3L1 axis.

Conclusion: EGR1 promotes METTL3 transcription and increases m6A-modified CHI3L1 level, thereby stimulating osteoclast differentiation and osteoporosis development.

Keywords

CHI3L1; EGR1; METTL3; Osteoclast; Osteoporosis; Transcription factor; m(6)A.

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