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Updated: Jun 19, 2026
Demonstration of the Rat Ischemic Skin Wound Model
Published on: April 1, 2015
LncRNA RMST knockout inhibits fibrosis by down-regulating Smad3 during mouse skin wound healing
Zhong Zhou1,2, Xulong Huang1,2, Chaohang Chen1,2
1Department of Forensic Medicine, Xuzhou Medical University, Xuzhou, Jiangsu, China.
Background And Objective:
Scarring presents a significant clinical challenge, imposing both physical and psychological burdens on patients. This drives the need for novel therapeutic strategies. Long non-coding RNAs (lncRNAs) have emerged as pivotal regulators of fibrosis. This study aims to investigate the role of the lncRNA RMST, which we identified as being upregulated during skin wound healing, in the pathogenesis of cutaneous scarring.
Materials And Methods:
A transcriptomic dataset was analyzed to identify lncRNAs dysregulated during skin wound healing. The function of RMST was assessed using in vivo RMST knockout models in a murine skin wound healing model. Wound tissues were harvested at day 21 post-injury for histological and molecular analysis. Downstream targets of RMST were predicted through bioinformatic analysis and validated using quantitative RT-PCR and Western blot. Finally, a rescue experiment was performed by overexpressing Smad3 in the context of RMST knockout to confirm the functional hierarchy.
Results:
RMST knockout significantly suppressed fibrotic progression and inflammatory activity at day 21 post-injury, demonstrated by reduced collagen deposition and lower levels of key inflammatory mediators. Bioinformatic and experimental analyses identified Smad3 as a key downstream target. RMST knockout directly reduced both Smad3 mRNA and protein levels, indicating a direct regulatory mechanism acting at the expression level. Crucially, the anti-fibrotic effects of RMST knockout were effectively reversed upon Smad3 overexpression, confirming that Smad3 acts functionally downstream of RMST.
Conclusion:
Our findings establish lncRNA RMST as a key driver of cutaneous fibrosis through its regulation of Smad3 expression. Targeting the RMST-Smad3 signaling axis therefore represents a promising therapeutic strategy for the treatment and prevention of scarring.
Insights
Long non-coding RNA RMST drives skin scarring by regulating Smad3. Targeting this RMST-Smad3 pathway offers a new strategy for preventing and treating scars.
Area of Science:
- Molecular Biology
- Dermatology
- Genetics
Background:
- Cutaneous scarring poses significant clinical and psychological challenges.
- Long non-coding RNAs (lncRNAs) are key regulators of fibrotic processes.
- The lncRNA RMST is upregulated during skin wound healing.
Purpose of the Study:
- Investigate the role of lncRNA RMST in the pathogenesis of cutaneous scarring.
- Identify downstream targets and functional mechanisms of RMST in fibrosis.
Main Methods:
- Transcriptomic analysis to identify dysregulated lncRNAs.
- In vivo RMST knockout murine model for skin wound healing.
- Histological, molecular, and bioinformatic analyses.
- Validation of Smad3 as a downstream target and functional rescue experiments.
Main Results:
- RMST knockout suppressed fibrotic progression and inflammation.
- Reduced collagen deposition and inflammatory mediators observed.
- Smad3 identified as a direct downstream target of RMST.
- Smad3 overexpression reversed the anti-fibrotic effects of RMST knockout.
Conclusions:
- lncRNA RMST drives cutaneous fibrosis via Smad3 regulation.
- The RMST-Smad3 signaling axis is a potential therapeutic target for scar treatment and prevention.
