Paradoxical downregulation of CXC chemokine receptor 4 induced by polyphemusin II-derived antagonists

Ryo Masuda, Shinya Oishi*, Noriko Tanahara, Hiroaki Ohno, Akira Hirasawa, Gozoh Tsujimoto, Yoshiaki Yano, Katsumi Matsuzaki, Jean Marc Navenot, Stephen C. Peiper, Nobutaka Fujii

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


CXC chemokine receptor 4 (CXCR4) is a G protein-coupled receptor implicated in cell entry of T-cell line-tropic HIV-1 strains. CXCR4 and its ligand stromal cell derived factor-1 (SDF-1)/CXCL12 play pivotal parts in many physiological processes and pathogenetic conditions (e.g., immune cell-homing and cancer metastasis). We previously developed the potent CXCR4 antagonist T140 from structure-activity relationship studies of the antimicrobial peptide polyphemusin II. T140 and its derivatives have been exploited in biological and biomedical studies for the SDF-1/CXCR4 axis. We investigated receptor localization upon ligand stimulation using fluorescent SDF-1 and T140 derivatives as well as a specific labeling technique for cellular-membrane CXCR4. Fluorescent T140 derivatives induced translocation of CXCR4 into the perinuclear region as observed by treatment with fluorescent SDF-1. T140 derivative-mediated internalization of CXCR4 was also monitored by the coiled-coil tag-probe system. These findings demonstrated that the CXCR4 antagonistic activity and anti-HIV activity of T140 derivatives were derived (at least in part) from antagonist-mediated receptor internalization. (Figure Presented)

Original languageEnglish
Pages (from-to)1259-1265
Number of pages7
JournalBioconjugate Chemistry
Issue number6
Publication statusPublished - 2012 Jun 20
Externally publishedYes

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry


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