Lymphocyte function antigen 1 (LFA-1) mediates early tumour necrosis factor alpha-induced leucocyte adhesion in venules.
Br J Haematol
; 110(2): 424-9, 2000 Aug.
Article
em En
| MEDLINE
| ID: mdl-10971402
ABSTRACT
A co-ordinated expression of specific adhesion molecules regulates leucocyte-endothelium interactions in the microcirculation. In the present study, we used intravital microscopy of the cremaster muscle in CD11a gene-targeted mice to examine the role of lymphocyte function antigen 1 (LFA-1, CD11a/CD18) in tumour necrosis factor alpha (TNF-alpha)-induced leucocyte rolling and firm adhesion in venules. We found that 30 min after TNF-alpha administration leucocyte rolling was unchanged compared with phosphate-buffered saline (PBS)-treated mice and similar in LFA-1-deficient and wild-type animals. In contrast, firm leucocyte adhesion in venules increased by almost 10-fold following 30 min of TNF-alpha challenge in LFA-1-expressing animals, whereas no increase was observed in LFA-1-deficient mice. Four hours after intrascrotal administration of TNF-alpha, venular leucocyte adhesion was found to be markedly increased, but similar in extent to LFA-1-deficient and wild-type mice. Histological examination of haematoxylin-eosin-stained tissue sections revealed that approximately 90% of the leucocytes in the TNF-alpha-stimulated venules in both wild-type and LFA-1-deficient mice were polymorphonuclear. Taken together, our functional in vivo data demonstrate that LFA-1 is an important adhesion molecule in early TNF-alpha-induced venular leucocyte adhesion.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Vênulas
/
Antígeno-1 Associado à Função Linfocitária
/
Fator de Necrose Tumoral alfa
/
Leucócitos
Limite:
Animals
Idioma:
En
Revista:
Br J Haematol
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Suécia