E2F2 is upregulated by the ERK pathway and regulates decidualization via MCM4

Area of Science:

• Reproductive biology
• Cell cycle regulation
• Molecular endocrinology

Background:

• Decidualization is crucial for pregnancy, involving complex cell cycle modulation.
• E2F2, a cell cycle regulator, has an unknown role in decidualization.
• Estrogen (E2) and progestin (P4) are key hormones in reproductive processes.

Purpose of the Study:

• To investigate the role of E2F2 in estrogen and progestin-induced decidualization.
• To elucidate the molecular mechanisms underlying E2F2 function during decidualization.

Main Methods:

• In vitro and in vivo decidualization models using E2 and P4.
• Analysis of E2F2 and MCM4 expression in mouse uterus and human ESCs.
• Manipulation of E2F2 and MCM4 expression and assessment of cell proliferation and viability.
• Investigation of the ERK signaling pathway and its interaction with E2F2/MCM4.

Main Results:

• E2P4 treatment downregulated E2F2 and MCM4 expression in vivo and in vitro.
• Ectopic expression of E2F2 or MCM4 rescued E2P4-induced reduction in hESC proliferation and restored G1 phase proteins.
• The ERK pathway was inactivated by E2P4, and its activation by Ro 67-7476 restored E2F2/MCM4 expression and reversed E2P4 effects.
• ERK activation also reversed E2P4-induced upregulation of IGFBP1 and PRL.

Conclusions:

• E2F2 is downregulated by E2P4 via inactivation of the ERK pathway during decidualization.
• The E2F2/MCM4 axis, regulated by ERK signaling, plays a critical role in cell cycle modulation during decidualization.
• The E2F2/MCM4 cascade represents a potential therapeutic target for treating decidualization disorders.