Do GnRH analogues directly affect human endometrial epithelial cell gene expression?

Area of Science:

• Reproductive Endocrinology
• Molecular Biology
• Cell Biology

Background:

• Gonadotrophin-releasing hormone (GnRH) analogues are used in assisted reproductive technology (ART) cycles.
• Their direct impact on endometrial gene expression, crucial for implantation, is not fully understood.
• Ishikawa cells serve as an in vitro model for human endometrial epithelial cells.

Purpose of the Study:

• To investigate the modulatory effects of GnRH analogues (leuprolide acetate and ganirelix acetate) on specific gene expression in Ishikawa cells.
• To analyze the 5'-flanking regions of these genes for potential steroid-response elements.
• To determine if GnRH analogues influence gene expression in the presence of estrogen, progesterone, and cAMP.

Main Methods:

• Reverse transcription-polymerase chain reaction (RT-PCR) was used to assess mRNA expression levels.
• Ishikawa cells were treated with GnRH analogues, estrogen (E2), progesterone (P4), and cyclic adenosine monophosphate (cAMP).
• Analysis of 5'-flanking regions identified putative estrogen-response elements (EREs) and progesterone-response elements (PREs).

Main Results:

• GnRH analogues alone or with E2/P4 did not significantly alter the expression of OPTN, CHMP1A, PSAP, or SNX7.
• Progesterone (P4) significantly increased CHMP1A expression.
• Leuprolide acetate (LA) significantly decreased IGFBP-5 expression after E2 + P4 treatment; 8-Br cAMP increased IGFBP-5 expression.
• Conserved EREs were found for OPTN, CHMP1A, SNX7, and PSAP; PREs were found for SNX7.

Conclusions:

• GnRH analogues exhibit minimal direct effects on the gene expression of human endometrial epithelial cells in vitro.
• Steroid hormones (E2 and P4) and cAMP play roles in modulating specific gene expressions, such as CHMP1A and IGFBP-5.
• The identified steroid-response elements suggest potential regulatory mechanisms for these genes.