Abstract
It is widely assumed that as connective tissue, the intervertebral disc (IVD) plays a crucial role in providing flexibility for the spinal column. The disc is comprised of three distinct tissues: the nucleus pulposus (NP), ligamentous annulus fibrous (AF) that surrounds the NP, and the hyaline cartilaginous endplates (CEP). Nucleus pulposus, composed of chondrocyte-like NP cells and its secreted gelatinous matrix, is critical for disc health and function. The NP matrix underwent dehydration accompanied by increasing fibrosis with age. The degeneration of matrix is almost impossible to repair, with the consequence of matrix stiffness and senescence of NP cells and intervertebral disc, suggesting the value of glycoproteins in extracellular matrix (ECM). Here, via database excavation and biological function screening, we investigated a C-type lectin protein, CLEC3A, which could support differentiation of chondrocytes as well as maintenance of NP cells and was essential to intervertebral disc homeostasis. Furthermore, mechanistic analysis revealed that CLEC3A could stimulate PI3K-AKT pathway to accelerate cell proliferation to further play part in NP cell regeneration.
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Funding
This work was supported by the grants from National Natural Science Foundation (81972127, 81802216), Shanghai Science and Technology Fund (20DZ2201300), Incubating Program for Clinical Research and Innovation of Renji Hospital (PYZY16-010).
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LL designed experiments, YJ interpreted data; XC and FF performed most of the experiments; ZL assisted in some experiments; YJ provided the key materials; LQ was assisted in some discussion; XC and YJ wrote the manuscript; LL and Hongxing Shen provided the overall guidance.
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Xiuyuan Chen, Yucheng Ji, Fan Feng, Zude Liu, Lie Qian, Hongxing Shen and Lifeng Lao declare that they have no conflict of interest.
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This study was performed in line with the principles of the Declaration of Helsinki. Ethics approval was obtained from the Institutional Review Board of Renji Hospital, School of Medicine, Shanghai Jiao Tong University. Informed consent was obtained from all individual participants included in the study.
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Chen, X., Ji, Y., Feng, F. et al. C-type lectin domain-containing protein CLEC3A regulates proliferation, regeneration and maintenance of nucleus pulposus cells. Cell. Mol. Life Sci. 79, 435 (2022). https://doi.org/10.1007/s00018-022-04477-x
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DOI: https://doi.org/10.1007/s00018-022-04477-x