Endocrinology, Vol 137, 1096-1101, Copyright © 1996 by Endocrine Society

ARTICLES

Requirement for transglutaminase in progesterone-induced decidualization of human endometrial stromal cells

M Fujimoto, H Kanzaki, H Nakayama, T Higuchi, H Hatayama, M Iwai, Y Kaneko, T Mori and J Fujita
Department of Gynecology and Obstetrics, Kyoto University, Kyoto, Japan.

Differentiation of endometrial stromal cells (decidualization) is essential for embryo implantation and maintenance of pregnancy. By sequential complementary DNA subtractive hybridization, one of the messenger RNAs (mRNA) induced by progesterone in human endometrial stromal cells decidualized in vitro was identified as that of a tissue transglutaminase type II (TGase). TGase mRNA was induced within 6 h after the addition of progesterone to the culture, and the effect was dose dependent. Both the TGase inhibitor monodansylcadaverine and oligodeoxynucleotide complementary to the TGase mRNA inhibited the decidualization, as assessed by PRL production and morphological transformation. Expression of TGase mRNA in human decidua and endometria exposed to high levels of progesterone in vivo was demonstrated by Northern blotting and in situ hybridization. These data suggest that TGase is necessary for the decidualization of human endometrial stromal cells and that clarification of the mechanism of action of TGase will facilitate further insight into the diagnosis and treatment of infertility.

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