Intercellular adhesion molecule-1 promotes neutrophil-mediated cytotoxicity.

Abstract:

BACKGROUND:Interaction of the CD11/CD18 complex on polymorphonuclear neutrophils (PMNs) and intercellular adhesion molecule (ICAM)-1 on endothelium is a critical event in PMN-mediated tissue injury. In addition, increased expression of ICAM-1 on type I pneumocytes has been identified in a variety of pulmonary disorders associated with PMN-induced inflammation. We hypothesized that ICAM-1 up-regulation is sufficient to promote cytotoxicity via activated PMNs. METHODS:The complementary DNA for human ICAM-1 was transfected into Chinese hamster ovarian (CHO) cells, which do not inherently express this adhesion receptor, by using the expression vector CD1.8. Fluorescence-activated cell sorter analysis revealed 62% CHO cell surface expression of ICAM-1. Wild type and transfected CHO cells were labeled with chromium 51 and exposed to quiescent or activated (1 mumol/L phorbol myristate acetate) PMNs for 4 hours. Subsets were pretreated with a monoclonal antibody to ICAM-1. PMN cytotoxicity was determined by specific percent 51Cr release. RESULTS:Incubation of quiescent PMNs with wild type and transfected CHO cells produced nominal cell lysis, 0.5% +/- 0.3% and 0.2% +/- 0.2%, respectively. Activated PMNs produced 13.6% +/- 3.2% versus 1.4% +/- 0.7% cell lysis, comparing transfected with wild type CHO cells, and 0.5% +/- 0.2% cell lysis after pretreatment with a monoclonal antibody to ICAM-1, p < 0.01. CONCLUSIONS:ICAM-1 up-regulation is sufficient to promote cytotoxicity via activated PMNs. This may represent a potential target for attenuating PMN-mediated injury to endothelial and other cell lines, including parenchyma.

journal_name

Surgery

journal_title

Surgery

authors

Barnett CC,Moore EE,Moore FA,Biffl WL,Smith MF Jr,Carl VS

doi

10.1016/s0039-6060(05)80320-4

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

171-5; discussion 176

issue

2

eissn

0039-6060

issn

1532-7361

pii

S0039-6060(05)80320-4

journal_volume

118

pub_type

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