Wilms' tumor (WT1) gene expression in rat decidual differentiation

Area of Science:

• Reproductive Biology
• Developmental Biology
• Gene Regulation

Background:

• The Wilm's tumor suppressor gene (WT1) encodes a transcription factor vital for urogenital tract development.
• WT1's precise role in uterine differentiation and pregnancy, particularly decidualization, remains incompletely understood.

Purpose of the Study:

• To investigate the spatiotemporal expression of WT1 in the rat uterus during normal development and pregnancy.
• To explore the potential role of WT1 in the process of decidualization.

Main Methods:

• Immunocytochemistry and in situ hybridization were employed to detect WT1 mRNA and protein.
• WT1 expression was analyzed in rat uterine tissues from day 0 to 20 post coitum (p.c.).
• WT1 expression was compared with insulin-like growth factor-II (IGF-II) and its receptor.

Main Results:

• WT1 mRNA was abundant in juvenile rat uterine stroma but decreased in mature rats.
• WT1 expression was significantly upregulated in endometrial cells during early pregnancy, specifically in decidual cells.
• WT1 was detected in decidual cells throughout pregnancy until parturition but not in placental tissues.
• No correlation was found between WT1, IGF-II, and its receptor expression during decidual differentiation.

Conclusions:

• WT1 expression is activated during the differentiation of uterine stromal cells into decidual cells.
• These findings strongly suggest a significant role for WT1 in the process of decidualization.
• WT1 may be a key regulator of uterine receptivity and pregnancy maintenance.