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Connolly JM, Kane MT, Quinlan LR, Hynes AC. Enhancing oxygen delivery to ovarian follicles by three different methods markedly improves growth in serum-containing culture medium. Reprod Fertil Dev 2019; 31:1339-1352. [PMID: 30975286 DOI: 10.1071/rd18286] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 02/07/2019] [Indexed: 12/12/2022] Open
Abstract
Invitro ovarian follicle culture systems are routinely used to study folliculogenesis and may provide solutions for infertility. Mouse follicles are typically cultured in standard gas-impermeable culture plates under gas phase oxygen concentrations of 5% or 20% (v/v). There is evidence that these conditions may not provide adequate oxygenation for follicles cultured as non-attached intact units in medium supplemented with serum and high levels of FSH. Three different methods of enhancing follicle oxygenation were investigated in this study: increasing the gas phase oxygen concentration, inverting the culture plates and using gas-permeable culture plates. Follicles cultured under 40% O2 were significantly larger (P P P 2 . These effects were associated with reduced secretion of vascular endothelial growth factor (P P P invivo -matured follicles (~500μm in diameter). Such follicular development is not possible under hypoxic conditions.
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Affiliation(s)
- J M Connolly
- Physiology, National University of Ireland Galway, University Road, Galway, Ireland; and Department of Physiology and Biochemistry, Ross University School of Medicine, Knoxville Campus, 9731 Cogdill Road, Knoxville, TN 37932, USA; and Corresponding author
| | - M T Kane
- Physiology, National University of Ireland Galway, University Road, Galway, Ireland
| | - L R Quinlan
- Physiology, National University of Ireland Galway, University Road, Galway, Ireland
| | - A C Hynes
- Physiology, National University of Ireland Galway, University Road, Galway, Ireland
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Talevi R, Sudhakaran S, Barbato V, Merolla A, Braun S, Di Nardo M, Costanzo V, Ferraro R, Iannantuoni N, Catapano G, Gualtieri R. Is oxygen availability a limiting factor for in vitro folliculogenesis? PLoS One 2018; 13:e0192501. [PMID: 29425251 PMCID: PMC5806880 DOI: 10.1371/journal.pone.0192501] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 01/24/2018] [Indexed: 02/06/2023] Open
Abstract
Transplantation of ovarian tissue for the preservation of fertility in oncological patients is becoming an accepted clinical practice. However, the risk of re-introducing tumour cells at transplantation has stirred an increased interest for complete in vitro folliculogenesis. This has not yet been achieved in humans possibly for the lack of knowledge on the environmental milieu that orchestrates folliculogenesis in vivo. The main aim of this study was to investigate the effect of oxygen availability on follicle health and growth during in vitro culture of ovarian tissue strips. To this end, a model was developed to predict the dissolved oxygen concentration in tissue under varying culture conditions. Ovarian cortical strips of bovine, adopted as an animal model, and human tissue were cultured in conventional (CD) and gas permeable (PD) dishes under different media column heights and gaseous oxygen tensions for 3, 6 and 9 days. Follicle quality, activation of primordial follicles to the primary stage, and progression to the secondary stage were analysed through histology. Follicle viability was assessed through a live-dead assay at the confocal scanning laser microscope. Findings showed a higher follicle quality and viability after culture of bovine ovarian strips in PD in adequate medium height and oxygen tensions. The best culture conditions found in the bovine were adopted for human ovarian strip culture and promoted a higher follicle quality, viability and progression. Overall, data demonstrated that modulation of oxygen availability in tissue plays a key role in maintaining follicles' health and their ability to survive and progress to the secondary stage during ovarian tissue in vitro culture. Such culture conditions could increase the yield of healthy secondary follicles for subsequent dissection and individual culture to obtain competent oocytes.
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Affiliation(s)
- Riccardo Talevi
- Dipartimento di Biologia, Università di Napoli "Federico II", Complesso Universitario di Monte S Angelo, Napoli, Italy
| | - Sam Sudhakaran
- St Bartholomew's Hospital, W Smithfield, London, United Kingdom
| | - Vincenza Barbato
- Dipartimento di Biologia, Università di Napoli "Federico II", Complesso Universitario di Monte S Angelo, Napoli, Italy
| | - Anna Merolla
- Dipartimento di Biologia, Università di Napoli "Federico II", Complesso Universitario di Monte S Angelo, Napoli, Italy
| | - Sabrina Braun
- Dipartimento di Biologia, Università di Napoli "Federico II", Complesso Universitario di Monte S Angelo, Napoli, Italy
| | - Maddalena Di Nardo
- Dipartimento di Biologia, Università di Napoli "Federico II", Complesso Universitario di Monte S Angelo, Napoli, Italy
| | - Valentina Costanzo
- Dipartimento di Biologia, Università di Napoli "Federico II", Complesso Universitario di Monte S Angelo, Napoli, Italy
| | | | - Nicola Iannantuoni
- Ospedale S. Maria delle Grazie, ASL Napoli 2 Nord, Località La Schiana, Pozzuoli, Italy
| | - Gerardo Catapano
- Department of Environmental and Chemical Engineering, University of Calabria, Rende, Italy
| | - Roberto Gualtieri
- Dipartimento di Biologia, Università di Napoli "Federico II", Complesso Universitario di Monte S Angelo, Napoli, Italy
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