Isolation of the galactose-binding lectin that mediates the in vitro adherence of Entamoeba histolytica

W. A. Petri, R. D. Smith, P. H. Schlesinger, C. F. Murphy, J. I. Ravdin

Research output: Contribution to journalArticle

195 Scopus citations

Abstract

Entamoeba histolytica adheres to human colonic mucus, colonic epithelial cells, and other target cells via a galactose (Gal) or N-acetyl-D-galactosamine (GalNAc) inhibitable surface lectin. Blockade of this adherence lectin with Gal or GalNAc in vitro prevents amebic killing of target cells. We have identified and purified the adherence lectin by two methods: affinity columns derivatized with galactose monomers or galactose terminal glycoproteins, and affinity columns and immunoblots prepared with monoclonal antibodies that inhibit amebic adherence. By both methods the adherence lectin was identified as a 170-kD secreted and membrane-bound amebic protein. The surface location of the lectin was confirmed by indirect immunofluorescence. Purified lectin competitively inhibited amebic adherence to target cells by binding to receptors on the target Chinese hamster ovary cells in a Gal-inhibitable manner.

Original languageEnglish
Pages (from-to)1238-1244
Number of pages7
JournalJournal of Clinical Investigation
Volume80
Issue number5
DOIs
StatePublished - Jan 1 1987

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