Abstract
Sepsis is a serious inflammatory disease caused by bacterial infection. Cardiovascular dysfunction and remodeling are serious complications of sepsis, which can significantly affect sepsis patients’ mortality. Delta-like homologue 1 (DLK1) has been reported could inhibit cardiac myofibroblast differentiation. However, the function of DLK1 in sepsis is unknown. In the present study, the DLK1 expression was first identified based on the online dataset GSE79962 analysis and cecal ligation and puncture (CLP)-induced sepsis mouse model. DLK1 expression was significantly reduced in septic heart tissues. In septic mouse heart, CLP operation decreased the fractional shortening (EF) (%) and ejection fraction (FS) (%) and caused significant edema, disordered myofilament arrangement, and degradation and necrosis in myocardial cells; CLP operation also increased collagen deposition and elevated the protein levels of fibrotic markers (α-SMA and F-actin). DLK1 overexpression in septic mice could effectively increase EF (%) and FS (%), attenuate CLP-caused ECM degradation and deposition and partially inhibit the CLP-induced TGF-β1/Smad signaling activation. In conclusion, DLK1 expression was poorly expressed in the CLP-induced septic mouse heart. DLK1 overexpression partially alleviated sepsis-induced cardiac dysfunction and fibrosis, with the involvement of the TGF-β1/Smad3 signaling pathway and MMPs.
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This project is supported by the National Natural Science Foundation of China (No.81971819), and Hunan Provincial Natural Science Foundation (No. 2020JJ4777).
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Ni Zeng designed the experiments and drafted the article. Feng Xiao revised the article critically for important intellectual content. Zaijin Jian, Junmei Xu, Sijia Zheng contributed to the experiments. Yongmei Fan contributed to the analysis and manuscript preparation. All the authors read and approved the manuscript.
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Zeng, N., Jian, Z., Xu, J. et al. DLK1 overexpression improves sepsis-induced cardiac dysfunction and fibrosis in mice through the TGF-β1/Smad3 signaling pathway and MMPs. J Mol Histol 54, 655–664 (2023). https://doi.org/10.1007/s10735-023-10161-6
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DOI: https://doi.org/10.1007/s10735-023-10161-6