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Live Cell Imaging of the TGF- β/Smad3 Signaling Pathway In Vitro and In Vivo Using an Adenovirus Reporter System
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The preventive and therapeutic implication for renal fibrosis by targetting TGF-β/Smad3 signaling

Yun Zhang1,2, Xiao-Ming Meng2,3, Xiao-Ru Huang2

  • 1Department of Dermatology, Foshan Hospital of Traditional Chinese Medicine, Foshan, China.

Clinical Science (London, England : 1979)
|June 8, 2018
PubMed

Insights

Targeting Smad3 with the inhibitor SIS3 effectively prevents and halts renal fibrosis progression in a mouse model. This therapeutic approach inhibits key fibrotic markers and TGF-β1 signaling, suggesting Smad3 as a viable target for kidney fibrosis treatment.

Area of Science:

  • Nephrology
  • Molecular Biology
  • Pharmacology

Background:

  • Transforming growth factor-β (TGF-β) signaling is crucial in tissue fibrogenesis.
  • Smad3 acts as a key downstream mediator in TGF-β-induced fibrotic processes.
  • Renal fibrosis is a significant pathological condition characterized by excessive extracellular matrix deposition.

Purpose of the Study:

  • To investigate the efficacy of Smad3 inhibition using SIS3 in preventing and treating renal fibrosis.
  • To elucidate the molecular mechanisms underlying the antifibrotic effects of SIS3 in a mouse model.

Main Methods:

  • Utilized a unilateral ureteral obstructive nephropathy (UUO) mouse model to induce renal fibrosis.
  • Administered SIS3 preventively at disease induction and therapeutically after disease establishment (day 4).
  • Assessed renal fibrosis by measuring α-smooth muscle actin (α-SMA) positive myofibroblasts and extracellular matrix components (collagen I, fibronectin).
  • Analyzed Smad3 signaling pathway activation and TGF-β1 expression in kidney tissues.

Main Results:

  • Preventive SIS3 treatment significantly suppressed renal fibrosis by inhibiting myofibroblast accumulation and extracellular matrix production.
  • Therapeutic SIS3 treatment initiated on day 4 post-UUO halted the progression of established renal fibrosis.
  • Both preventive and therapeutic effects were correlated with Smad3 pathway inactivation and reduced TGF-β1 expression in the affected kidneys.

Conclusions:

  • Targeting Smad3 with SIS3 demonstrates significant potential in both preventing and treating renal fibrosis.
  • Smad3 inhibition offers a specific and effective therapeutic strategy for managing kidney fibrotic diseases.
  • The findings support Smad3 as a key molecular target for developing novel antifibrotic therapies.
Keywords:
SIS3TGF-β/Smad3renal fibrosistreatment

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