Follicle development in cryopreserved bitch ovarian tissue grafted to immunodeficient mouse
L. Commin A B , S. Buff A , E. Rosset A , C. Galet A , A. Allard A , P. Bruyere A , T. Joly A , P. Guérin A and V. Neto A
+ Author Affiliations
- Author Affiliations
A Equipe Cryobio, Unité Propre de Soutien de Programme Interaction Cellule Environnement, VetAgroSup/ISARA Lyon, Université de Lyon, VetAgro Sup, 2011.03.101, UPSP I.C.E. – Equipe CRYOBIO, F-69280 Marcy l’Etoile, France.
B Corresponding author. Email: l.commin@vetagro-sup.fr
Reproduction, Fertility and Development 24(3) 461-471 https://doi.org/10.1071/RD11166
Abstract
The present study evaluated: (1) in vivo follicular development in canine ovarian tissue after slow freezing and xenotransplantation; and (2) the use of erythropoietin (EPO) as an angiogenic factor to optimise the transplantation procedure. Frozen–thawed ovarian tissue from five bitches was grafted into severe combined immunodeficient (SCID) mice (n = 47) treated with or without EPO (500 IU kg–1, once daily for 3 days) (Groups A and B, respectively) and analysed after 0, 1, 8 or 16 weeks. Follicle grade, follicle density, follicle morphology and stromal cells density were assessed by histological analysis, whereas vascularisation of the graft was quantified by immunohistochemistry with anti-α-smooth muscle actin antibody. Despite a massive loss of follicles after grafting, secondary follicle density was higher at 8 and 16 weeks than at 1 week regardless of EPO treatment. EPO significantly improved early follicle morphology and stromal cell density after 8 weeks and blood vessel density at 16 weeks after transplantation (P < 0.05). Intact secondary follicles with more than three granulosa cells layers were observed 16 weeks after transplantation. The results suggest that canine ovarian tissue can be successfully preserved by our slow-freezing protocol because the tissue showed follicular growth after xenotransplantation. EPO treatment did not lessen the massive loss of follicles after transplantation.
Additional keywords: cryopreservation, dog, follicle growth, ischaemia, xenograft.
References
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