Genetic and Pharmacological Modulation of Akt1 for Improving Ovarian Graft Revascularization in a Mouse Model
Yoni Cohen1, Hagit Dafni2, Reut Avni3
1Department of Biological Regulation, Weizmann Institute of Science, Rehovot, Israel Racine IVF unit, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.
Abstract:
Ovarian tissue cryopreservation and transplantation is one of a few available treatments for fertility preservation in women diagnosed with cancer. Rapid revascularization is essential for reducing hypoxic damage after grafting and protecting the primordial follicles reserve. Using a mouse model of heterotopic ovarian graft transplantation, we have delineated the role of endothelial Akt1 expression using longitudinal magnetic resonance imaging follow-up to quantify angiogenic response. Endothelial Akt1 activation in ovarian grafts promoted angiogenesis to support the graft during posttransplantation hypoxic period. Similarly, simvastatin therapy activated Akt1 at the transplantation site and improved the revascularization and vascular support of ovarian grafts. These results serve as an important first step toward pharmacological intervention to improve revascularization of ovarian grafts and restoration of fertility in cancer survivors. The pro-angiogenic effects reported here may extend beyond improving ovarian graft reception in fertility preservation and could potentially be used for different organ or tissue transplantation.
Insights
Endothelial Akt1 activation promotes blood vessel growth, improving ovarian graft survival after transplantation. Simvastatin therapy also enhances revascularization, aiding fertility preservation for cancer survivors.
Area of Science:
- Reproductive biology
- Transplantation immunology
- Vascular biology
Background:
- Ovarian tissue cryopreservation is crucial for fertility preservation in cancer patients.
- Rapid revascularization of ovarian grafts is vital to prevent hypoxic damage and preserve follicles.
- Endothelial Akt1 plays a potential role in regulating graft vascularization.
Purpose of the Study:
- To investigate the role of endothelial Akt1 in ovarian graft revascularization.
- To assess the impact of simvastatin therapy on ovarian graft vascular support.
- To explore pharmacological strategies for improving fertility preservation outcomes.
Main Methods:
- Utilized a mouse model for heterotopic ovarian graft transplantation.
- Employed longitudinal magnetic resonance imaging (MRI) to quantify angiogenic response.
- Analyzed endothelial Akt1 activation in ovarian grafts and at the transplantation site.
Main Results:
- Endothelial Akt1 activation in ovarian grafts significantly promoted angiogenesis.
- Akt1 activation supported ovarian grafts during the critical post-transplantation hypoxic period.
- Simvastatin therapy activated Akt1 and enhanced revascularization and vascular support of ovarian grafts.
Conclusions:
- Endothelial Akt1 activation is a key factor in promoting ovarian graft revascularization.
- Simvastatin therapy shows promise as a pharmacological intervention to improve ovarian graft survival.
- These findings offer a potential strategy for enhancing fertility preservation in cancer survivors and other transplant scenarios.
