Both IL-1 and laminin are reported to inhibit progesterone receptor-mediated decidualization
signals in endometrial stromal cells, but the effects of these two inhibitors on cAMP-mediated
decidualization signals remain unknown. Furthermore, the interaction between IL-1-stimulated
and lamininstimulated signals has not been analyzed yet. In this study, interactions
between these two decidualization-inhibitory signals and their effects on 8-Br-cAMP-mediated
decidualization in human endometrial stromal cells were investigated. Prolactin release
from decidualized stromal cells was measured by enzyme immunoassay in order to quantitate
in vitro decidualization. Both IL-1β and laminin were found to inhibit 8-Br-cAMP-induced decidualization
in vitro in human endometrial stromal cells. IL-1β dose-dependently inhibited decidualization
of stromal cells cultured on both laminin-coated and collagen-coated dishes, while
laminin inhibited the decidualization of stromal cells cultured both with and without
IL-1β. These results indicate that IL-1β and laminin additively and mutually inhibit
cAMP-mediated decidualization signals, and that they may inhibit these signals through
different mechanisms.
Key words
Endometrium - Endometrial Stromal Cell - Decidualization - IL-1β - Laminin - cAMP
