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The Novel Small Molecule BTB Inhibits Pro-Fibrotic Fibroblast Behavior though Inhibition of RhoA Activity.

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Idiopathic pulmonary fibrosis (IPF) lung tissue shows increased lactate and lower pH. Targeting the TDAG8 receptor or RhoA signaling with BTB may offer new anti-fibrotic therapies for IPF.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pulmonary Medicine

Background:

  • Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease with poor prognosis despite current therapies.
  • Lactate is upregulated in IPF lungs, contributing to decreased tissue pH and potentially influencing cellular responses.
  • Proton-sensing G-protein coupled receptors (GPCRs) are activated by reduced pH and may play a role in IPF pathogenesis.

Purpose of the Study:

  • To investigate the role of proton-sensing GPCRs in IPF.
  • To identify novel therapeutic targets for IPF by examining differences between healthy and IPF lung fibroblasts.
  • To evaluate the therapeutic potential of specific compounds targeting these pathways.

Main Methods:

  • Analysis of proton-sensing GPCR expression in primary human lung fibroblasts from non-fibrotic and IPF donors.
  • Knockdown of TDAG8 (a specific GPCR) to assess its effect on myofibroblast differentiation.
  • Treatment with BTB, a proposed TDAG8 modulator, to evaluate its impact on myofibroblast differentiation and RhoA signaling.

Main Results:

  • TDAG8 expression is upregulated in IPF lung fibroblasts.
  • Knockdown of TDAG8 reduces myofibroblast differentiation.
  • BTB inhibits myofibroblast differentiation independently of TDAG8, by suppressing RhoA-mediated signaling.

Conclusions:

  • TDAG8 is a potential therapeutic target in IPF.
  • BTB demonstrates anti-fibrotic potential by inhibiting RhoA signaling and myofibroblast differentiation.
  • Targeting RhoA signaling pathways presents a promising therapeutic strategy for IPF.