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Richard L. Scher, MD; Wayne M. Koch, MD; William J. Richtsmeier, MD, PhD

Arch Otolaryngol Head Neck Surg. 1993;119(4):432-438.

Abstract
• Objective.
—To determine if the cell surface antigen, the intercellular adhesion molecule 1 (ICAM-1), is expressed on head and neck (H&N) squamous cell carcinoma (SCC) cell lines, and if treatment with interferon gamma (IFN-) enhances the expression of the antigen. Intercellular adhesion molecule 1 mediates effector cell adhesion, activation, and function in inflammatory and immunologic reactions, and it may be important in the generation of antitumor immune surveillance and cytotoxicity against H&N SCC.

Materials.
—Four human SCC cell lines, JHU-011-SCC, JHU-020-SCC, JHU-022-SCC, and FaDu, established by explant technique from tumors of the upper aerodigestive tract, were utilized for these experiments. The cell lines were maintained and tested under standard tissue culture conditions.

Methods.
—Fluorescence-activated cell sorting and enzyme-linked immunosorbent assay were performed to identify the presence of ICAM-1 on the H&N SCC cell lines after staining with an anti—ICAM-1 monoclonal antibody (CD54). The SCC cell lines were treated with either fresh media or varying dosages (1 to 1000 U/mL) of recombinant human interferon gamma (rHuIFN-) to determine constitutive and enhanced antigen expression. The kinetics of the response to rHuIFN- were determined for the JHU-022-SCC cell line. The effect of the cytokines interleukin 1, interleukin 2, tumor necrosis factor , and interferon alfa on ICAM-1 expression on JHU-022-SCC was also tested.

Main Outcome Measure.
—Constitutive and enhanced ICAM-1 expression.

Results.
—Low levels of constitutive expression of ICAM-1 were identified on all four H&N SCC cell lines, with significantly enhanced expression seen after rHuIFN- treatment (P=.0001). Maximally enhanced expression of the antigen on JHU-022-SCC occurred after treatment for 48 hours with 100 U/mL of rHuIFN- (P =.0001). Induction of ICAM-1 expression was detectable after treatment with as little as 10 U/mL of rHuIFN- (P<.001). Induction was also present after treatment with interleukin 1 and tumor necrosis factor , but not with interleukin 2 or interferon alfa.

Conclusions.
—Intercelluar adhesion molecule 1 is constitutively expressed on H&N SCC cell lines, with enhanced expression seen after treatment with interferon gamma and other cytokines. This suggests that the antigen may be involved in the generation of an immune response against SCC of the H&N.

(Arch Otolaryngol Head Neck Surg. 1993;119:432-438)

Author Affiliations
From the Department of Otolaryngology—Head and Neck Surgery, Johns Hopkins Medical Institutions, Baltimore, Md. Drs Scher and Richtsmeier are now with Duke University Medical Center, Durham, NC.

Footnotes
Accepted for publication October 22, 1992.

Read before the Research Forum, 95th Annual Meeting of the American Academy of Otolaryngology—Head and Neck Surgery, Kansas City, Mo, September 23, 1991.

Reprint requests to Division of Otolaryngology—Head and Neck Surgery, Duke University Medical Center, Box 3805, Durham, NC 27710 (Dr Scher).

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