TREM-2 Binds to Lipooligosaccharides of Neisseria Gonorrhoeae and is Expressed on Reproductive Tract Epithelial Cells

Overview

Journal Mucosal Immunol

Publisher Elsevier

Specialty Allergy & Immunology

Date 2008 Dec 17

PMID 19079182

Citations 30

Authors

D N Quan

M D Cooper

J L POTTER

M H Roberts

H Cheng

G A Jarvis

Affiliations

Soon will be listed here.

Abstract

Triggering receptor expressed on myeloid cells-2 (TREM-2) is an innate immune receptor that initiates cellular activation upon ligation. In this study, we examined the interaction of TREM-2 with Neisseria gonorrhoeae using murine TREM-2A, as it has been reported to recognize bacterial ligands. Using a whole-bacteria enzyme-linked immunosorbent assay (ELISA), TREM-2A bound to all six strains in variable degrees. Far-western blots of gonococcal outer membranes revealed TREM-2A binding to lipooligosaccharide (LOS) and opacity (Opa) protein, with predominant binding to LOS. Binding of TREM-2A to LOS was confirmed by ELISA and surface plasmon resonance. O-deacylation of the lipid A significantly reduced binding. Flow cytometry and reporter cell assays showed that gonococci bound to TREM-2A-transfected cells and induced transmembrane signaling. In humans, TREM-2 was constitutively expressed by genitourinary and fallopian tube epithelial cells, both of which are primary targets of gonococcal invasion. Ligation of TREM-2 by LOS induced interleukin-6 production in HeLa cervical carcinoma cells. To our knowledge, this is the first report of the expression of human TREM-2 by cells deriving from a non-myeloid lineage. We conclude that gonococci can interact with TREM-2 receptors through binding to LOS and Opa protein and initiate cell signaling and cytokine production.

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