The expression of the CD18 leucocyte integrin in a rabbit model of acute myocardial infarction: a pilot study of temporal changes and relationship to infarct size.

Abstract:

:CD18 integrins mediate leucocyte adhesion to vascular endothelium. This represents the initial step in inflammatory cell infiltration following myocardial necrosis. The current study assessed whether the expression of these rapidly activated and readily measured adhesion receptors on circulating neutrophils would reflect the extent of cardiac damage in a rabbit model of acute myocardial infarction. Myocardial ischaemia/infarction was induced in anaesthetised adult male New Zealand white rabbits (n = 8) by ligation of the circumflex or marginal coronary artery. To control for the effects of anaesthesia and surgery, 4 rabbits underwent identical procedures without the induction of infarction. Absolute infarct size (in mg) and infarct size as a percentage of total left ventricular mass (relative infarct size) were calculated by differential staining and weighing of necrotic myocardium. Flow cytometry was used to determine cell surface expression of CD18 at six time points (baseline, 20 and 45 min of ischaemia and 20, 60 and 180 min of reperfusion). Absolute neutrophil CD18 expression and changes in expression over baseline were correlated with absolute and relative infarct size. Mean neutrophil CD18 expression increased significantly (from 2.42 +/- 0.20 to 3.07 +/- 0.29; p = 0.04) within 20 min of ischaemia. CD18 expression at 3 h did not predict absolute or relative infarct size (r = 0.40 and 0.37, respectively). The percentage change in cell surface CD18 expression (above baseline levels) was, however, correlated with both measures of infarct size (r = 0.76, p = 0.03, and r = 0.92, p = 0.001, respectively). In conclusion, in this rabbit model of myocardial infarction, neutrophil CD18 expression rises within 20 min of the induction of ischaemia but absolute values after 3 h of reperfusion are poor indicators of infarct size. Although percentage change in neutrophil CD18 levels over baseline correlates with infarct size there is considerable variation between individuals, limiting any clinical application.

journal_name

Cardiology

journal_title

Cardiology

authors

Hillis G,Taggart P,Dalsey W,Mangione A,Ma XL

doi

10.1159/000047341

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

35-9

issue

1

eissn

0008-6312

issn

1421-9751

pii

47341

journal_volume

95

pub_type

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