Z. Morise et al., Effects of lipopolysaccharide on endothelial cell adhesion molecule expression in interleukin-10 deficient mice, INFLAMMATIO, 23(2), 1999, pp. 99-110
Interleukin (IL)-10 is known to inhibit the production of proinflammatory c
ytokines by macrophages suggesting that endogenous IL-10 may act as an anti
; inflammatory agent. Because endothelial cell adhesion molecules (ECAMs) p
lay a key role in the recruitment of leukocytes into tissue in response to
an inflammatory stimulus (i.e., lipopolysaccharide (LPS)) and the following
cytokine production, we wished to assess the importance of IL-IO as an end
ogenous modulator of ECAM expression using IL-10 deficient mice. Constituti
ve and LPS-stimulated expression of intercellular adhesion molecule (ICAM)-
1, vascular cell adhesion molecule (VCAM)-1 and E-selectin were measured in
wild type C57BL/6 and IL-10 deficient mice with no signs of active enteroc
olitis, using the dual radiolabeled monoclonal antibody technique. We found
that constitutive expression of these ECAMs did not differ between IL-10 d
eficient and WT mice for all organs tested. However, we demonstrated larger
increments in LPS-induced expression of ICAM-1 and VCAM-1 in the vasculatu
re of the small intestine in IL-IO deficient mice compared to WT mice. Thes
e findings suggest that endogenous IL-10 does not modulate constitutive or
LPS-induced expression of ECAMs in most tissues, however it does appear to
play an inhibitory role in LPS-stimulated expression of ICAM-1 and VCAM-1 i
n the intestinal vasculature.