Journal of Peking University (Health Sciences) ›› 2024, Vol. 56 ›› Issue (6): 950-955. doi: 10.19723/j.issn.1671-167X.2024.06.002

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Expression and significance of ferroptosis marker 4-HNE in in vitro model of systemic sclerosis

Kelin ZHAO1, Xue XIA1, Naixu SHI2, Han ZHOU1, Jingwen GAI1, Ping LI1,*()   

  1. 1. Department of Rheumatology and Immunology, China-Japan Union Hospital, Jilin University, Changchun 130000, China
    2. Department of Stomatology, China-Japan Union Hospital, Jilin University, Changchun 130000, China
  • Received:2024-07-31 Online:2024-12-18 Published:2024-12-18
  • Contact: Ping LI E-mail:li_ping@jlu.edu.cn
  • Supported by:
    the Jilin Provincial Department of Finance Health Research Talent Special Project(2021SCZ14)

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Abstract:

Objective: To investigate the expression and physiological significance of the ferroptosis marker 4-hydroxynonenal (4-HNE) in myofibroblasts induced by transforming growth factor-β1 (TGF-β1), providing theoretical evidence for its potential role in the diagnosis and treatment of fibrosis in systemic sclerosis (SSc). Methods: Mouse embryonic fibroblasts (NIH3t3) were cultured and divided into two groups after 12 h of starvation: the control group (cultured in 1% serum-containing medium) and the TGF-β1 group (cultured in 10 μg/L TGF-β1 with 1% serum-containing medium). Cell morphology changes in both groups were observed under a microscope. To confirm successful establishment of the SSc cell model, fibrosis markers were analyzed using reverse transcription quantitative real-time PCR (RT-qPCR) and Western blot. Next, flow cytometry was employed to assess the intracellular levels of reactive oxygen species (ROS) in both groups. Finally, Western blot and immunofluorescence staining were used to measure the expression of 4-HNE in the TGF-β1-treated cells. Results: Microscopic observations revealed that TGF-β1 treatment caused the NIH3t3 cells to transition from a typical spindle shape to a flat, polygonal shape with multiple protrusions, indicating fibroblast activation. The RT-qPCR and Western blot analyses showed that the expression of the fibrosis marker Vimentin was significantly upregulated in the TGF-β1 group compared with the control group (P < 0.01), confirming that TGF-β1 effectively promoted fibrosis-related gene and protein expression. Flow cytometry results indicated that TGF-β1 significantly elevated intracellular ROS levels, suggesting the induction of oxidative stress. Furthermore, both Western blot and immuno-fluorescence staining demonstrated a significant increase in 4-HNE expression in the TGF-β1-treated cells (immunofluorescence intensity P < 0.05). Conclusion: TGF-β1 promotes fibroblast activation and fibrosis while inducing ROS production, leading to a marked increase in 4-HNE expression. Given the role of 4-HNE as a marker of lipid peroxidation and its elevated levels in the SSc cell model, this study suggests that 4-HNE could serve as a potential biomarker for fibrosis in SSc. The findings highlight the importance of investigating the mechanisms of 4-HNE in fibrosis and suggest that targeting this pathway could offer new therapeutic opportunities for treating SSc.

Key words: Systemic sclerosis, Fibroblasts, Ferroptosis, Fibrosis

CLC Number: 

  • R593.25

Figure 1

The morphological effects of TGF-β1 on NIH3t3 A, representative images of NIH3t3 with and without added TGF-β1 for 24 h under the microscope (×20); B, construction pattern diagram of NIH3t3 cell model induced by TGF-β1. TGF-β1, transforming growth factor-β1."

Figure 2

Profibrotic effect of TGF-β1 on NIH3t3 * * P < 0.01. A, RT-qPCR detection of changes in expression levels of Vimentin gene in NIH3t3; B, Western blot determination of Vimentin in NIH3t3. TGF-β1, transforming growth factor-β1; RT-qPCR, reverse transcription quantitative real-time PCR."

Figure 3

Flow cytometry detection of ROS fluorescence intensity in NIH3t3 induced by TGF-β1 TGF-β1, transforming growth factor-β1; ROS, reactive oxygen species."

Figure 4

Up-regulated expression of 4-HNE in a systemic sclerosis cell model * P < 0.05. A, immunofluorescence representation of 4-HNE in NIH3t3 cells (×200). NIH3t3 cells were treated with 0.1% Triton X-100 for per-meabilization and blocked with 5% bovine serum albumin (BSA). Cells were incubated overnight at 4 ℃ with a primary antibody against 4-HNE (dilution 1 ∶ 50). The following day, cells were labeled with a FITC-conjugated secondary antibody (dilution 1 ∶ 100) and incubated at room temperature for 1 h. Nuclear staining was performed using DAPI. B, quantification of average immunofluorescence intensity of 4-HNE in NIH3t3 cells (P < 0.05). C, Western blot determination of 4-HNE in NIH3t3. 4-HNE, 4-hydroxynonenal."

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