Galectin-3 and galectin-1 bind distinct cell surface glycoprotein receptors to induce T cell death

Brianna N. Stillman, Daniel K. Hsu, Mabel Pang, C. Fred Brewer, Pauline Johnson, Fu Tong Liu, Linda G. Baum

Research output: Contribution to journalArticle

329 Scopus citations

Abstract

Galectins are a family of mammalian β-galactoside-binding proteins that positively and negatively regulate T cell death. Extracellular galectin-1 directly induces death of T cells and thymocytes, while intracellular galectin-3 blocks T cell death. In contrast to the antiapoptotic function of intracellular galectin-3, we demonstrate that extracellular galectin-3 directly induces death of human thymocytes and T cells. However, events in galectin-3- and galectin-1-induced cell death differ in a number of ways. Thymocyte subsets demonstrate different susceptibility to the two galectins: whereas galectin-1 kills double-negative and double-positive human thymocytes with equal efficiency, galectin-3 preferentially kills double-negative thymocytes. Galectin-3 binds to a complement of T cell surface glycoprotein receptors distinct from that recognized by galectin-1. Of these glycoprotein receptors, CD45 and CD71, but not CD29 and CD43, appear to be involved in galectin-3-induced T cell death. In addition, CD7 that is required for galectin-1-induced death is not required for death triggered by galectin-3. Following galectin-3 binding, CD45 remains uniformly distributed on the cell surface, in contrast to the CD45 clustering induced by galectin-1. Thus, extracellular galectin-3 and galectin-1 induce death of T cells through distinct cell surface events. However, as galectin-3 and galectin-1 cell death are neither additive nor synergistic, the two death pathways may converge inside the cell.

Original languageEnglish (US)
Pages (from-to)778-789
Number of pages12
JournalJournal of Immunology
Volume176
Issue number2
DOIs
StatePublished - Jan 15 2006

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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