Identification of a structural domain that distinguishes the actions of the type 1 and 2 isoforms of transforming growth factor beta on endothelial cells

Proc Natl Acad Sci U S A. 1992 Jul 15;89(14):6290-4. doi: 10.1073/pnas.89.14.6290.

Abstract

A chimeric transforming growth factor beta (TGF-beta) molecule has been synthesized to map the amino acids responsible for the substantially greater activity of TGF-beta 1 than TGF-beta 2 on growth and migration of endothelial cells. This chimera consists of a dimer of a monomeric unit composed of amino acids 1-39 of TGF-beta 2, 40-82 of TGF-beta 1, and 83-112 of TGF-beta 2. Structural identity of the purified recombinant protein has been confirmed by immunoblotting and NH2-terminal sequencing. The biological potency of the TGF-beta 2-1-2 chimera was equal to that of TGF-beta 1 in inhibition of growth of both fetal bovine heart endothelial cells and rat epididymal fat pad microvascular endothelial cells. Similarly, the TGF-beta 2-1-2 chimera was nearly equivalent to TGF-beta 1 and at least 10-fold more active than TGF-beta 2 in inhibiting migration of bovine aortic endothelial cells. These results identify the sequence between amino acids 40-82 as an important region within TGF-beta that functions to specify a TGF-beta 1- or TGF-beta 2-like activity.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Base Sequence
  • Cell Division / drug effects
  • Cell Movement / drug effects
  • Cloning, Molecular
  • Endothelium, Vascular / cytology*
  • Growth Inhibitors
  • In Vitro Techniques
  • Molecular Sequence Data
  • Oligodeoxyribonucleotides / chemistry
  • Recombinant Fusion Proteins / chemistry
  • Structure-Activity Relationship
  • Transforming Growth Factor beta / chemistry
  • Transforming Growth Factor beta / pharmacology*

Substances

  • Growth Inhibitors
  • Oligodeoxyribonucleotides
  • Recombinant Fusion Proteins
  • Transforming Growth Factor beta