Soluble intercellular adhesion molecule-1 and natural killer cell activity in gastric cancer patients

Akihiko Kaihara, Hiromi Iwagaki, Akira Gouchi, Akio Hizuta, Hiroshi Isozaki, Norihisa Takakura, Noriaki Tanaka

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Intercellular adhesion molecule-1 (ICAM-1), a molecule bound to the cell surface, is a ligand for leukocyte function antigen-1 (LFA-1), and the ICAM- 1/LFA-1 system mediates various cell-cell interactions involved in immunity. Soluble ICAM-1 (sICAM-1) is a circulating substance and binds with LFA-1 of leukocytes, thus, making leukocytes less available for binding with cell surface ICAM-1 on target cells. The serum level of soluble ICAM-1 (sICAM-1) was found to be significantly elevated (p<0.01) in patients with early and advanced gastric cancer compared with healthy controls. Natural killer activity (NK activity) was assessed by measuring the cytotoxicity of peripheral blood mononuclear cells (PBMCs) for K562 cells. There was no significant difference in NK activity between gastric cancer patients and healthy controls when heat-inactivated fetal calf serum was used in assays. However, addition of patient serum significantly decreased (p<0.05) NK activity when the serum was from patients with advanced gastric cancer compared with healthy volunteers. Addition of anti-ICAM-1 monoclonal antibody 0 to 5.0 μg/ml caused little change in NK activity in healthy controls, but its addition at 10 μg/ml remarkably decreased NK-activity in gastric cancer patients, probably through antibody binding with ICAM-1 on target cells. In other experiments, liver metastasis was induced in mice by inoculation of colon 26 murine colon cancer cells. In vitro pretreatment of colon 26 cells with the anti-ICAM-1 monoclonal antibody significantly increased the number of metastatic nodules. These results suggest that both sICAM-1 and anti-CAM- 1 monoclonal antibody act as immunosuppressive factors by inhibiting the ICAM-1/LFA-1 system.

Original languageEnglish
Pages (from-to)283-300
Number of pages18
JournalResearch Communications in Molecular Pathology and Pharmacology
Issue number3
Publication statusPublished - Jun 1 1998

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology


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