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Purpose. To evaluate the role of intercellular adhesion molecule 1 (ICAM-1) in cutaneous leukocyte trapping in venous disease, we used our rodent model of venous hypertension (VH).
Materials and methods. VH was created in adult rats by ligation of the inferior vena cava, bilateral common iliac veins, and bilateral common femoral veins. In the Phase I experimental (exptl) group, anti-ICAM-1 monoclonal antibody (1A29) was given intravenously prior to venous ligations. Acute venous pressures were measured in the exptl and control (ctrl) (ligation only) groups. Bilateral forelimb and hindlimb skin specimens were harvested for myeloperoxidase (MPO) assay. In Phase II, VH was created in a chronic group; in a sham-operated group, ties were placed around the same vessels without ligations. Two weeks later, venous pressures were measured and radiolabeled (125I and 131I) monoclonal antibody (mAb) to ICAM-1 was injected and allowed to circulate for 5 min before the level of radiolabeled antibody within forelimb and hindlimb specimens was measured.
Results. In the acute study with 1A29, hindlimb pressures were significantly elevated in both the ctrl (n = 4) and exptl (n = 4) hindlimbs (15.4 ± 0.239 and 13.8 ± 1.89 mm Hg, respectively) compared with ctrl and exptl forelimbs (1.38 ± 0.554 and 1.50 ± 0.612 mm Hg, respectively). However, MPO activity was significantly elevated in the hindlimbs of the ctrl group compared with the hindlimbs of the exptl animals (19.8 ± 1.54 U vs 6.71 ± 2.46 U). In the chronic VH rats (n = 5) given radiolabeled anti-ICAM-1 mAb, the hindlimb pressures (10.1 ± 4.52 mm Hg) were significantly elevated (P < 0.05) compared with forelimb pressures (1 ± 0.447 mm Hg) and compared with the forelimb and hindlimb pressures in the sham-operated animals (n = 4) (1.63 ± 0.813 and 4.25 ± 2.13 mm Hg, respectively). However, there was not a significant difference in the quantity of ICAM-1—hindlimb versus forelimb or chronic VH versus sham.
Conclusions. Anti-ICAM-1 mAb decreased MPO activity in hypertensive hindlimb skin, supporting the instrumental role of ICAM-1 in cutaneous leukocyte trapping. However, the constituent endothelial ICAM-1 is not elevated by VH.
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☆Presented at the 23rd Annual Symposium of the Association of Veterans Administration Surgeons, St. Louis, MO, May 2–4, 1999.
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