2. Academic Validation
  3. Developmental growth plate cartilage formation suppressed by artificial light at night via inhibiting BMAL1-driven collagen hydroxylation

Developmental growth plate cartilage formation suppressed by artificial light at night via inhibiting BMAL1-driven collagen hydroxylation

  • Cell Death Differ. 2023 Apr 7. doi: 10.1038/s41418-023-01152-x.
Guangjin Chen # 1 2 3,  Qingming Tang # 1 2 3,  Shaoling Yu 1 2 3,  Yufeng Shen 1 2 3,  Jiwei Sun 1 2 3,  Jinfeng Peng 1 2 3,  Ying Yin 1 2 3,  Guangxia Feng 1 2 3,  Xiaofeng Lu 1 2 3,  Gang Mei 1 2 3,  Yifan Zhang 1 2 3,  Qian Wan 4,  Luoying Zhang 5,  Lili Chen 6 7 8
Affiliations

Affiliations

  • 1 Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
  • 2 School of Stomatology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
  • 3 Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration, Wuhan, 430022, China.
  • 4 Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Huazhong University of Science and Technology, Wuhan, 430030, China.
  • 5 Key Laboratory of Molecular Biophysics of Ministry of Education, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China.
  • 6 Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China. chenlili1030@hust.edu.cn.
  • 7 School of Stomatology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China. chenlili1030@hust.edu.cn.
  • 8 Hubei Province Key Laboratory of Oral and Maxillofacial Development and Regeneration, Wuhan, 430022, China. chenlili1030@hust.edu.cn.
  • # Contributed equally.
PMID: 37029304 DOI: 10.1038/s41418-023-01152-x
Abstract

Exposure to artificial light at night (LAN) can induce obesity, depressive disorder and osteoporosis, but the pernicious effects of excessive LAN exposure on tissue structure are poorly understood. Here, we demonstrated that artificial LAN can impair developmental growth plate cartilage extracellular matrix (ECM) formation and cause endoplasmic reticulum (ER) dilation, which in turn compromises bone formation. Excessive LAN exposure induces downregulation of the core circadian clock protein BMAL1, which leads to collagen accumulation in the ER. Further investigations suggest that BMAL1 is the direct transcriptional activator of prolyl 4-hydroxylase subunit alpha 1 (P4ha1) in chondrocytes, which orchestrates collagen prolyl hydroxylation and secretion. BMAL1 downregulation induced by LAN markedly inhibits proline hydroxylation and transport of collagen from ER to golgi, thereby inducing ER stress in chondrocytes. Restoration of BMAL1/P4HA1 signaling can effectively rescue the dysregulation of cartilage formation within the developmental growth plate induced by artificial LAN exposure. In summary, our investigations suggested that LAN is a significant risk factor in bone growth and development, and a proposed novel strategy targeting enhancement of BMAL1-mediated collagen hydroxylation could be a potential therapeutic approach to facilitate bone growth.

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