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Published in: Reproductive Biology and Endocrinology 1/2015

Open Access 01-12-2015 | Research

Vitrification of human ovarian tissue: a practical and relevant alternative to slow freezing

Authors: Sandra Sanfilippo, Michel Canis, Johan Smitz, Benoît Sion, Claude Darcha, Laurent Janny, Florence Brugnon

Published in: Reproductive Biology and Endocrinology | Issue 1/2015

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Abstract

Background

Cryopreservation of ovarian tissue can be used to preserve the fertility of patients who are about to receive treatment(s) that could compromise their future ovarian function. Here we evaluate the effectiveness of a vitrification protocol by carrying out a systematic comparison with a conventional slow-freezing method on human ovarian tissue.

Methods

Human ovarian samples (mean age 28.0 ± 1.1 years) were processed in parallel for each cryopreservation procedure: vitrification and slow-freezing. Following warming/thawing, histological observations and a TUNEL assay in ovarian follicles were performed and compared to unfrozen control.

Results

Both cryopreservation protocols gave comparable histological outcomes. Percentage of intact follicles was 83.6 % following vitrification in a 1.5 M 1,2-propanediol (PrOH), 1.5 M ethylene glycol (EG) and 0.5 M raffinose solution, 80.7 % after slow-freezing in 1.5 M PrOH and 0.025 M raffinose, and 99.6 % in fresh tissue. Follicle density was unchanged by vitrification (0.6 follicles/mm2) or slow-freezing (0.5 follicles/mm2) compared to fresh tissue (0.7 follicles/mm2). Percentage of follicles with DNA fragmentation was not statistically different in vitrified (20.8 %) or slow-frozen (31.3 %) tissues compared to the unfrozen control (35.0 %). There was no difference in proportion of stroma cells with DNA fragmentation in vitrified (6.4 %) and slow-frozen (3.7 %) tissues compared to unfrozen tissue (4.2 %).

Conclusions

This vitrification protocol enables good preservation of ovarian quality post-warming. The evaluation of endocrine function after vitrification need to be perform in a higher cohort to evaluate if this protocol may offer a relevant alternative to conventional slow-freezing for the cryopreservation of human ovarian tissue.
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Metadata
Title
Vitrification of human ovarian tissue: a practical and relevant alternative to slow freezing
Authors
Sandra Sanfilippo
Michel Canis
Johan Smitz
Benoît Sion
Claude Darcha
Laurent Janny
Florence Brugnon
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Reproductive Biology and Endocrinology / Issue 1/2015
Electronic ISSN: 1477-7827
DOI
https://doi.org/10.1186/s12958-015-0065-5

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