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Objective <p>To investigate the therapeutic effects and mechanisms of curcumin (Cur) in adenomyosis (AM).</p> Methods <p>A mouse uterine AM model was established by exposing ICR neonatal mice to tamoxifen (TAM). Female neonatal mice (day 1, <i>n</i>=24) were numbered and randomly divided into control, model (TAM 1 mg/kg per day, day 2 to 5), low- and high-doses Cur groups (TAM 1 mg/kg per day, day 2 to 5; Cur 50 and 200 mg/kg per day, respectively, week 13 to 15), by a random number table, with 6 mice in each group. The effect of Cur was assessed by a hot-plate test on mice and uterine sections for hematoxylin and eosin (HE), Masson staining, and immunohistochemistry staining of E-cadherin, N-cadherin, matrix metalloproteinases (MMP) 9 and MMP 11. Ishikawa (IK) cell phenotypic transformation was induced by transforming growth factor beta 1 (TGF-β1), and the mRNA and protein expressions of E-cadherin, N-cadherin, MMP 9, MMP 11 and p-Smad3/Smad3 were detected by quantitative real-time PCR and Western blot after Cur treatment.</p> Results <p><i>In vivo</i> study results showed that Cur significantly improved pain tolerance (<i>P</i>&lt;0.01). The degrees of lesion fibrosis and invasion of ectopic glands in model mice were significantly higher than those in control mice, and the degrees were significantly reduced after high-dose Cur treatment (<i>P</i>&lt;0.01). High-dose Cur reversed the decrease of E-cadherin and the increase of the levels of N-cadherin, MMP 9 and MMP11 by inhibiting the production of TGF-β1 in the uterine tissue (<i>P</i>&lt;0.01). <i>In vitro</i> study, Cur increased the protein expression of E-cadherin and reduced the protein expressions of N-cadherin, MMP 9 and MMP 11 (<i>P</i>&lt;0.01). Cur effectively inhibited the phosphorylation of p-Smad3/Smad3 in IK cells induced by TGF-β1 (<i>P</i>&lt;0.01).</p> Conclusion <p>Cur effectively alleviates AM and inhibits fibroblast differentiation and epithelial-mesenchymal transition by TGF-β1/Smad3 pathway, which provides a new approach for treating AM by non-hormonal drugs.</p>

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Curcumin Inhibits Fibroblast Differentiation and Epithelial-Mesenchymal Transition to Alleviate Adenomyosis through TGF-β1/Smad3 Pathway

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • Qing-mei Yang,
  • Yang Chen,
  • Li-hua Xia,
  • Han Xu,
  • Xiao-fen Jin,
  • Qing Wu

摘要

Objective

To investigate the therapeutic effects and mechanisms of curcumin (Cur) in adenomyosis (AM).

Methods

A mouse uterine AM model was established by exposing ICR neonatal mice to tamoxifen (TAM). Female neonatal mice (day 1, n=24) were numbered and randomly divided into control, model (TAM 1 mg/kg per day, day 2 to 5), low- and high-doses Cur groups (TAM 1 mg/kg per day, day 2 to 5; Cur 50 and 200 mg/kg per day, respectively, week 13 to 15), by a random number table, with 6 mice in each group. The effect of Cur was assessed by a hot-plate test on mice and uterine sections for hematoxylin and eosin (HE), Masson staining, and immunohistochemistry staining of E-cadherin, N-cadherin, matrix metalloproteinases (MMP) 9 and MMP 11. Ishikawa (IK) cell phenotypic transformation was induced by transforming growth factor beta 1 (TGF-β1), and the mRNA and protein expressions of E-cadherin, N-cadherin, MMP 9, MMP 11 and p-Smad3/Smad3 were detected by quantitative real-time PCR and Western blot after Cur treatment.

Results

In vivo study results showed that Cur significantly improved pain tolerance (P<0.01). The degrees of lesion fibrosis and invasion of ectopic glands in model mice were significantly higher than those in control mice, and the degrees were significantly reduced after high-dose Cur treatment (P<0.01). High-dose Cur reversed the decrease of E-cadherin and the increase of the levels of N-cadherin, MMP 9 and MMP11 by inhibiting the production of TGF-β1 in the uterine tissue (P<0.01). In vitro study, Cur increased the protein expression of E-cadherin and reduced the protein expressions of N-cadherin, MMP 9 and MMP 11 (P<0.01). Cur effectively inhibited the phosphorylation of p-Smad3/Smad3 in IK cells induced by TGF-β1 (P<0.01).

Conclusion

Cur effectively alleviates AM and inhibits fibroblast differentiation and epithelial-mesenchymal transition by TGF-β1/Smad3 pathway, which provides a new approach for treating AM by non-hormonal drugs.