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Chinese Journal of Cell and Stem Cell(Electronic Edition) ›› 2024, Vol. 14 ›› Issue (05): 294-302. doi: 10.3877/cma.j.issn.2095-1221.2024.05.005

• Original Researches • Previous Articles     Next Articles

An experimental study was conducted to examine the impact of activated collagen/DDR2 signaling on the migration and proliferation of kidney fibroblasts in renal interstitial fibrosis

Huiyan Chen1, Yao Wu1, Zongxuan Huang2, Xin Bo3, Qinghui Wang2, Huitao Ji2, Yinzhen Chen2, Hu Zhao1,()   

  1. 1.Department of General Surgery, Fuzong Clinical Medical College of Fujian Medical University, 900th Hospital of Joint Logistics Support Force, PLA, Fuzhou 350025, China
    2.Department of General Surgery, Fuzhou General Teaching Hospital, Fujian University of Traditional Chinese Medicine (900TH Hospital of Joint Logistics Support Force), Fuzhou 350122, China
    3.Department of Biochemistry and Molecular Biology, School of Basic Medicine, Air Force Military Medical University, Xi'an 710032, China
  • Received:2024-03-30 Online:2024-10-01 Published:2024-12-02
  • Contact: Hu Zhao

Abstract:

Objective

To investigate the effect of collagen/DDR2 signaling on the proliferation and migration of renal fibroblasts during renal interstitial fibrosis.

Methods

A renal tubulointerstitial fibrosis model was established in SPF male C57BL/6 mice via unilateral ureteral obstruction (UUO), and pathological samples and fresh tissues were obtained for Western blotting and immunohistochemistry. Human kidney fibroblasts were cultivated, followed by the transfection of KFB cells with shDDR2 and its negative control lentivirus, OE-DDR2 and its negative control lentivirus, and screening with 5 μg/mL puromycin. A stable transfection cell line was then created and exposed to 10 μg/mL collagen for 48 hours. Control Group 1: shCtrl + Collagen group (shDDR2 negative control, without downregulation of DDR2 expression but with collagen treatment); Control Group 2: Control + Collagen group (OE-DDR2 negative control, without overexpression of DDR2 but with collagen treatment); Experimental Group 1: shDDR2 + Collagen group (DDR2 gene knockdown with collagen treatment); Experimental Group 2: OE-DDR2 + Collagen group (DDR2 gene overexpression with collagen treatment); Experimental Group 3: Based on Experimental Group 2, treated with 1 μmol/L dasatinib, with all groups being treated for 48 hours. The expression level of DDR2 mRNA was detected by RT-qPCR, and the level of DDR2 protein was assessed by Western blot. Cell proliferation was evaluated using the CCK-8 assay and the BrdU assay. Cell localization and pathological changes were observed by HE staining and immunohistochemical staining methods. Comparisons between two groups were performed using independent samples t-test, and the t' test was used when variances were unequal. For comparisons among multiple groups,one-way ANOVA was applied, with LSD-t test used for pairwise comparisons when variances were homogeneous, and Tamhane's T2 test was used when variances were heterogeneous.

Results

DDR2 is localized in renal stromal fibroblasts in mouse kidney tissue, and has a colocalization relationship with collagen. Compared with the shCtrl+collagen group, the cell proliferation rate (0.28 ± 0.00 vs 0.38 ± 0.01) in the sh-DDR2+ collagen group slowed down (P< 0.05), and the transwell transfer rate (6.00 ± 1.00 vs 21.66 ± 0.57) decreased (P< 0.05). Compared with the Control+collagen group, the cell proliferation rate of the OE-DDR2+ collagen group (0.43 ± 0.01 vs 0.39 ± 0.01) was accelerated (P< 0.05), and the transwell mobility rate (32.66 ± 0.57 vs 22.33 ± 0.57) was increased(P< 0.05). After the addition of dasatinib, the cell proliferation rate (0.36 ± 0.00 vs 0.39 ± 0.01)was significantly reduced.

Conclusion

Collagen/DDR2 signaling activation significantly promoted the proliferation of KFB cells and inhibited apoptosis, ultimately promoting the occurrence and development of renal interstitial fibrosis.

Key words: Renal interstitial fibrosis, Myofibroblast, Collagen, DDR2, Therapeutic target

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