Increased expression of leukocyte function associated antigen-1 (LFA-1) and intercellular adhesion molecule-1 (ICAM-1) by alveolar macrophages of patients with pulmonary sarcoidosis.

Abstract:

:Leukocyte function associated antigen-1 (LFA-1) and its ligand intercellular adhesion molecule-1 (ICAM-1) are cell adhesion molecules that play an important role in the capacity of monoculear phagocytes (MPs) to present antigens to T lymphocytes. Since in pulmonary sarcoidosis (PS) this capacity is increased at sites of disease activity, we studied the expression of LFA-1 and ICAM-1 on peripheral blood monocytes (BMs) and alveolar macrophages (AM) obtained by bronchoalveolar lavage (BAL) from normal subjects (n = 7) and patients with PS (n = 14). To accomplish this, immunocytochemical stainings were made on cytocentrifuge preparations using anti-LFA-1 (anti-CD 11a) and anti-ICAM-1 (anti-CD 54) monoclonal antibodies (MoAbs). Normal and sarcoid BMs displayed a high percentage of positivity with both MoAbs with no difference between study groups (LFA-1: control BM 87.8 +/- 8.8 percent; sarcoid BM 84.7 +/- 9.5 percent; ICAM-1: control BM 80.8 +/- 10 percent; sarcoid BM 88.0 +/- 4.2 percent; p = NS for all comparisons). In both groups the percentage of cells expressing LFA-1 and ICAM-1 molecules among AMs was lower than among autologous BMs (LFA-1: control AM 46.5 +/- 13.2 percent, p less than 0.001 vs control BM; sarcoid AM 64.2 +/- 15.9; p less than 0.001 vs sarcoid BM) (ICAM-1: control AM 42.7 +/- 8.5 percent, p less than 0.001 vs control BM; sarcoid AM 72.1 +/- 10.6, p less than 0.001 vs sarcoid BM). AMs from patients with PS showed a higher degree of positivity for LFA-1 and ICAM-1 than normal AMs (p less than 0.02 and p less than 0.001, respectively). The positivity for LFA-1 and ICAM-1 molecules on sarcoid AMs was not correlated with the positivity for two different BM-associated markers (ie, the CD 11b and the CD 14 molecules) and was not correlated with the percentage of T lymphocytes in BAL, selected as a marker of the intensity of the alveolitis. These results suggest that the increased ability of sarcoid AMs to induce the proliferation of T lymphocytes may be related, at least in part, to the increased expression of LFA-1 and ICAM-1 molecules on their surfaces.

journal_name

Chest

journal_title

Chest

authors

Melis M,Gjomarkaj M,Pace E,Malizia G,Spatafora M

doi

10.1378/chest.100.4.910

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

910-6

issue

4

eissn

0012-3692

issn

1931-3543

pii

S0012-3692(16)32476-X

journal_volume

100

pub_type

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