64 EPITHELIAL MESENCHYMAL TRANSITION AND DIFFERENTIATION OF STEROIDOGENIC FACTOR 1 MOUSE EMBRYONIC STEM CELLS INTO THE STEROIDOGENIC CELLS

Abstract

Steroidogenic factor 1 (SF-1) is essential for the development and function of steroidogenic tissues. Stable incorporation of SF-1 into embryonic stem cells has been reported to prime the cells for steroidogenesis. In this study, we transfected mouse embryonic stem cells (mESCs) with the mouse SF1 gene (SF1-mESCs) by using the nucleofector (Lonza), and selected SF1-mESCs by G418 250 μg mL–1. The selected cells were differentiated into granulosa-like cells through hanging-drops for 3 days, suspension culture for 1 day, then attachment onto 6-well plates. Expression of steroidogenesis-related genes and gonadal lineage-markers was analysed by real-time PCR. To test the phenotype for granulosa-like cells, transcripts of specific forkhead transcription factor (Foxl2) and follicle stimulating hormone receptor (Fshr) were measured. Also, expression of EMT-related genes, such as E-Cadherin (Cdh1), N-Cadherin (Cdh2), Snai1, Snai2 (Slug), Twist, and Vimentin, was monitored. SF1-mESCs were differentiated into the primitive streak‐mesendoderm and the steroidogenic enzymes such as 3β-hydroxysteroid dehydrogenase (Hsd3b1), cytochrome P450-containing enzyme (Cyp)-11a1, and Cyp19a1 were time-dependently changed. Next, the mRNA levels of Foxl2 and Fshr representing granulosa-like cell were increased during differentiation of SF1-mESCs. Especially, the level of oestradiol and Cdh2 was increased at a specific differentiation time. We induced differentiation of mESCs into the functional granulosa-like cells through transfection of the mouse SF1 gene. These cells will be useful for further study and potential application of these cells in steroidogenesis. This research was supported by a grant (15182MFDS460) from the Ministry of Food and Drug Safety in 2015.