An immunosuppressive and anti-inflammatory HLA class I-derived peptide binds vascular cell adhesion molecule-1

Xuefeng Ling, Tomoaki Tamaki, Yun Xiao, Salar Kamangar, Carol Clayberger, David B. Lewis, Alan M. Krensky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Background. A synthetic peptide corresponding to residues 75-84 of HLA-B2702 modulates immune responses in rodents and humans both in vitro and in vivo. Methods. We used a yeast two-hybrid screening, an in vitro biochemical method, and an in vivo animal model. Results. Two cellular receptors for this novel immunomodulatory peptide were identified using a yeast two-hybrid screen: immunoglobulin binding protein (BiP), a member of the heat shock protein 70 family, and vascular cell adhesion molecule (VCAM)-1. Identification of BiP as a ligand for this peptide confirms earlier biochemical findings, while the interaction with VCAM-1 suggests an alternative mechanism of action. Binding to the B2702 peptide but not to closely related variants was confirmed by ligand Western blot analysis and correlated with immunomodulatory activity of each peptide. In mice, an ovalbumin-induced allergic pulmonary response was blocked by in vivo administration of either the B2702 peptide or anti-VLA-4 antibody. Conclusions. We propose that the immunomodulatory effect of the B2702 peptide is caused, in part, by binding to VCAM-1, which then prevents the normal interaction of VCAM-1 with VLA-4.

Original languageEnglish (US)
Pages (from-to)662-667
Number of pages6
JournalTransplantation
Volume70
Issue number4
DOIs
StatePublished - Aug 27 2000

ASJC Scopus subject areas

  • Transplantation

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