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Cell-penetrating peptides selectively targeting SMAD3 inhibit profibrotic TGF-? signaling.


ABSTRACT: TGF-? is considered a master switch in the pathogenesis of organ fibrosis. The primary mediators of this activity are the SMAD proteins, particularly SMAD3. In the current study, we have developed a cell-penetrating peptide (CPP) conjugate of the HIV TAT protein that is fused to an aminoterminal sequence of sorting nexin 9 (SNX9), which was previously shown to bind phosphorylated SMAD3 (pSMAD3). We determined that specifically preventing the nuclear import of pSMAD3 using the TAT-SNX9 peptide inhibited profibrotic TGF-? activity in murine cells and human lung fibroblasts as well as in vivo with no demonstrable toxicity. TGF-? signaling mediated by pSMAD2, bone morphogenetic protein 4 (BMP4), EGF, or PDGF was unaffected by the TAT-SNX9 peptide. Furthermore, while the TAT-SNX9 peptide prevented TGF-?'s profibrotic activity in vitro as well as in 2 murine treatment models of pulmonary fibrosis, a 3-amino acid point mutant that was unable to bind pSMAD3 proved ineffective. These findings indicate that specifically targeting pSMAD3 can ameliorate both the direct and indirect fibroproliferative actions of TGF-?.

SUBMITTER: Kang JH 

PROVIDER: S-EPMC5490773 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Cell-penetrating peptides selectively targeting SMAD3 inhibit profibrotic TGF-β signaling.

Kang Jeong-Han JH   Jung Mi-Yeon MY   Yin Xueqian X   Andrianifahanana Mahefatiana M   Hernandez Danielle M DM   Leof Edward B EB  

The Journal of clinical investigation 20170522 7


TGF-β is considered a master switch in the pathogenesis of organ fibrosis. The primary mediators of this activity are the SMAD proteins, particularly SMAD3. In the current study, we have developed a cell-penetrating peptide (CPP) conjugate of the HIV TAT protein that is fused to an aminoterminal sequence of sorting nexin 9 (SNX9), which was previously shown to bind phosphorylated SMAD3 (pSMAD3). We determined that specifically preventing the nuclear import of pSMAD3 using the TAT-SNX9 peptide in  ...[more]

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