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Identification of PDGF-BB binding to thymosin β4 by chemical cross-linking

Jana Knop1, Christine App, Thomas Huff

  • 1Friedrich-Alexander-University Erlangen-Nuremberg, Institute of Biochemistry , Fahrstr. 17, 91054 Erlangen , Germany +49 9131 85 24187 ; Ewald.Hannappel@fau.de.

Expert Opinion on Biological Therapy
|June 23, 2015
PubMed
Abstract

Insights

Thymosin beta4 (Tβ4) directly binds to platelet-derived growth factor-BB (PDGF-BB), potentially explaining Tβ4's antifibrotic effects in liver fibrogenesis by reducing PDGF-BB receptor activation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Thymosin beta4 (Tβ4) shows potential as an antifibrotic drug for liver fibrogenesis.
  • Tβ4 inhibits platelet-derived growth factor-BB (PDGF-BB)-induced activation of hepatic stellate cells (HSCs).
  • The mechanism by which Tβ4 counteracts PDGF-BB-induced HSC activation is largely unknown.

Purpose of the Study:

  • To identify unknown interaction partners of Tβ4.
  • To test the hypothesis that Tβ4 directly binds to PDGF-BB.
  • To elucidate the mechanism of Tβ4's antifibrotic action.

Main Methods:

  • In vitro chemical cross-linking using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC).
  • In vitro photochemical cross-linking using a biotin-labeled Tβ4 derivative.
  • Analysis of protein-protein interactions between purified Tβ4 and PDGF-BB.

Main Results:

  • Direct interaction between Tβ4 and PDGF-BB was confirmed using both EDC and photochemical cross-linking.
  • PDGF-BB is identified as the first extracellular binding partner for Tβ4.
  • This interaction may modulate PDGF-BB binding to its receptor, potentially inhibiting PDGF-BB-related effects.

Conclusions:

  • Tβ4 directly interacts with PDGF-BB.
  • This direct interaction is a potential mechanism underlying the diverse biological effects of Tβ4.
  • Considering extracellular interactions is crucial for understanding β-thymosin functions.
Keywords:
biotin label transfercross-linkingplatelet-derived growth factorβ-thymosin

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