An anti-apoptotic peptide improves survival in lethal total body irradiation

  • Jonathan E. McDunn
  • , Jared T. Muenzer
  • , Benjamin Dunne
  • , Anthony Zhou
  • , Kevin Yuan
  • , Andrew Hoekzema
  • , Carolyn Hilliard
  • , Katherine C. Chang
  • , Christopher G. Davis
  • , Jacquelyn McDonough
  • , Clayton Hunt
  • , Perry Grigsby
  • , David Piwnica-Worms
  • , Richard S. Hotchkiss

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Cell penetrating peptides (CPPs) have been used to deliver the anti-apoptotic Bcl-xL-derived BH4 peptide to prevent injury-induced apoptosis both in vitro and in vivo. Here we demonstrate that the nuclear localization sequence (NLS) from the SV40 large T antigen has favorable properties for BH4 domain delivery to lymphocytes compared to sequences based on the HIV-1 TAT sequence. While both TAT-BH4 and NLS-BH4 protected primary human mononuclear cells from radiation-induced apoptotic cell death, TAT-BH4 caused persistent membrane damage and even cell death at the highest concentrations tested (5-10 μM) and correlated with in vivo toxicity as intravenous administration of TAT-BH4 caused rapid death. The NLS-BH4 peptide has significantly attenuated toxicity compared to TAT-BH4 and we established a dosing regimen of NLS-BH4 that conferred a significant survival advantage in a post-exposure treatment model of LD90 total body irradiation.

Original languageEnglish
Pages (from-to)657-662
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume382
Issue number4
DOIs
StatePublished - May 15 2009

Keywords

  • Apoptosis
  • BH4
  • Bcl-2
  • Cell death
  • Cell penetrating motif
  • NLS
  • Necrosis
  • TAT
  • Total body irradiation

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