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Infection and Immunity, March 1999, p. 1149-1156, Vol. 67, No. 3
0019-9567/99

Invasion of Human Mucosal Epithelial Cells by Neisseria gonorrhoeae Upregulates Expression of Intercellular Adhesion Molecule 1 (ICAM-1)dagger

Gary A. Jarvis,1,2,* Jing Li,2 and Karen V. Swanson2

Department of Laboratory Medicine, University of California San Francisco,1 and Center for Immunochemistry, Veterans Administration Medical Center,2 San Francisco, California

Received 3 April 1998/Returned for modification 27 May 1998/Accepted 15 December 1998

Infection of the mucosa by Neisseria gonorrhoeae involves adherence to and invasion of epithelial cells. Little is known, however, about the expression by mucosal epithelial cells of molecules that mediate cellular interactions between epithelial cells and neutrophils at the site of gonococcal infection. The aim of this study was to determine the expression of intercellular adhesion molecule 1 (ICAM-1) by epithelial cells during the process of gonococcal invasion. The highly invasive strain FA1090 and the poorly invasive strain MS11 were incubated with human endometrial adenocarcinoma (HEC-1-B) or human cervical carcinoma (ME-180) epithelial cells, after which ICAM-1 expression was measured by flow cytometry. After 15 h of infection with FA1090, expression of ICAM-1 increased 4.7- and 2.1-fold for HEC-1-B and ME-180 cells, respectively, whereas 15 h of infection of HEC-1-B cells with MS11 increased ICAM-1 expression only 1.6-fold. ICAM-1 expression was restricted to the cell surface, since no soluble ICAM-1 was detected. The distribution of staining was heterogeneous and mimicked that seen after treatment of HEC-1-B cells with the ICAM-1 agonist tumor necrosis factor alpha (TNF-alpha ) in the absence of bacteria. PCR and dot blot analyses of ICAM-1 mRNA showed no change in levels over time in response to infection. Although TNF-alpha was produced by HEC-1-B cells after infection, the extent of ICAM-1 upregulation was not affected by neutralizing anti-TNF-alpha antiserum. Dual-fluorescence flow cytometry showed that the cells with the highest levels of ICAM-1 expression were cells with associated gonococci. We conclude that epithelial cells upregulate the expression of ICAM-1 in response to infection with invasive gonococci. On the mucosa, upregulation of ICAM-1 by infected epithelial cells may function to maintain neutrophils at the site of infection, thereby reducing further invasion of the mucosa by gonococci.

* Corresponding author. Mailing address: VA Medical Center, Dept. 111W1, 4150 Clement St., San Francisco, CA 94121. Phone: (415) 221-4810, ext. 2303. Fax: (415) 221-7542. E-mail: jarvis{at}itsa.ucsf.edu.

dagger Report 91 from the Center for Immunochemistry.

Infection and Immunity, March 1999, p. 1149-1156, Vol. 67, No. 3
0019-9567/99


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