Localization and quantification of adhesion molecule expression in the lower uterine segment during premature labor

To investigate localization and concentration of adhesion molecules in the human lower uterine segment during preterm parturition.

In a prospective study biopsy specimens from the lower uterine segment of 43 patients undergoing cesarean section at 24 + 0 to 36 + 4 weeks' gestation were immunostained for intercellular adhesion molecule-1, endothelial leukocyte adhesion molecule-1, vascular cell adhesion molecule-1, and platelet endothelial cell adhesion molecule-1, and the concentrations measured by enzyme immunoassay. The results were analyzed in relation to the degree of cervical dilatation (< 2 cm, 2- < 4 cm, > or = 4 cm) and duration of labor (< or = 6 h, > 6-12 h; > 12 h).

Intercellular adhesion molecule-1 and platelet endothelial cell adhesion molecule-1 were strongly expressed by capillary endothelium, endothelial leukocyte adhesion molecule-1 and vascular cell adhesion molecule-1 to only a minor degree. Intercellular adhesion molecule-1 concentration was greater at > or = 4 cm dilatation than at 2- < 4 cm and after > 12 h labor than after < or = 6 h. Endothelial leukocyte adhesion molecule-1 concentration was greater after > 12 h than after < or = 6 h.

Premature labor is associated with up-regulation of adhesion molecules in the lower uterine segment.