P-437 Follicle activation in human ovarian tissue: impact of freezing, culture and grafting
Abstract Study question How does freezing, in vitro culture (IVC) and grafting to chorioallantoic membrane (CAM) affect follicle activation through the PI3K pathway in human ovarian tissue? Summary answer Freezing does not trigger further follicle activation. Although IVC and CAM do induce follicle...
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| Published in: | Human reproduction (Oxford) 2022-06, Vol.37 (Supplement_1) |
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| Main Authors: | , , , , , , |
| Format: | Article |
| Language: | eng |
| Online Access: | Get full text |
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| Summary: | Abstract
Study question
How does freezing, in vitro culture (IVC) and grafting to chorioallantoic membrane (CAM) affect follicle activation through the PI3K pathway in human ovarian tissue?
Summary answer
Freezing does not trigger further follicle activation. Although IVC and CAM do induce follicle activation, the process is significantly curbed in the CAM group.
What is known already
While massive follicle activation has been shown to occur through the PI3K pathway in frozen-thawed human ovarian tissue after both short-term xenotransplantation and IVC, it remains poorly understood in fresh ovarian tissue, raising many questions about the effect of freezing on follicle activation. Furthermore, grafting ovarian tissue to CAM has been found to limit follicle activation in animal ovarian tissue, though its impact on human follicles is yet to be elucidated.
Study design, size, duration
Thirty fresh cortical fragments from 5 patients and 50 frozen-thawed tissue pieces from another 5 patients were investigated. We first compared fresh fragments (fresh-IVC) with frozen-thawed tissue (FT-IVC) by IVC. These cultured frozen-thawed fragments were then examined against frozen-thawed fragments grafted to CAM (FT-CAM). After both IVC and CAM grafting, ovarian cortical pieces (4x2x1 mm) were analyzed on day (D) 0, 1 and 6.
Participants/materials, setting, methods
Follicle analyses included histology (count and classification), transmission electron microscopy (ultrastructure), immunohistochemistry (Ki67 for follicle proliferation, c-caspase-3 for follicle apoptosis, LC3B for follicle autophagy, p-AKT for PI3K activation and p-rpS6 for PI3K/mTOR activation), and immunofluorescence (FOXO1 for PI3K/FOXO activation). Subcellular localization of FOXO1 was determined in primordial follicles on high-resolution images using structured illumination microscopy. Droplet digital PCR further investigated expression of PI3K pathway-related genes (TSC1 and CDKN1B) and oocyte growth-related genes (GDF9 and LHX8).
Main results and the role of chance
No differences were detected between the fresh-IVC and the FT-IVC groups in any conducted analyses. After both IVC and CAM grafting, a significant decrease was observed in primordial follicle proportions in all groups on D6 vs D0 (p |
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| ISSN: | 0268-1161 1460-2350 |