Reduced fertilization after ICSI and abnormal phospholipase C zeta presence in spermatozoa from the wobbler mouse.
Failed fertilization after intracytoplasmic sperm injection (ICSI) can be due to a reduced oocyte-activation capacity caused by reduced concentrations and abnormal localization of the oocyte-activation factor phospholipase C (PLC) zeta. Patients with this condition can be helped to conceive by artificial activation of oocytes after ICSI with calcium ionophore (assisted oocyte activation; AOA). However some concern still exists about this approach. Mouse models could help to identify potential oocyte-activation strategies and evaluate their safety. In this study, the fertilizing capacity of wobbler sperm cells was tested and the efficiency of AOA with two exposures to ionomycin to restore fertilization and embryo development was studied. The quality of the obtained blastocysts was assessed and embryo transfer was performed to evaluate post-implantation development. The presence of PLCzeta in the spermatozoa and testis of the wobbler mouse was evaluated by PLCzeta immunostaining and quantitative reverse-transcription polymerase chain reaction. Sperm cells from wobbler mice had reduced fertilizing capacity and abnormalities in PLCzeta localization, but not in its expression. Artificially activating the oocytes restored fertilization and embryo development. Therefore, the wobbler mouse can be a model for failed fertilization after ICSI to study PLCzeta dynamics and aid in optimization of the AOA method.
Department of Reproductive Medicine, Ghent University Hospital, De Pintelaan 185, B-9000 Ghent, Belgium.
Elke
E
Heytens
Thomas
T
Schmitt-John
Jakob M
JM
Moser
Nanna Mandøe
NM
Jensen
Reza
R
Soleimani
Claire
C
Young
Kevin
K
Coward
John
J
Parrington
Petra
P
De Sutter
D000818:Animals; D004624:Embryo Transfer; D005306:Fertilization / Q000502:physiology*; D007248:Infertility, Male / Q000378:metabolism* / Q000628:therapy; D015759:Ionomycin / Q000008:administration & dosage / Q000494:pharmacology; D008297:Male; D051379:Mice; D009865:Oocytes / Q000187:drug effects / Q000502:physiology*; D054801:Phosphoinositide Phospholipase C / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020554:Sperm Injections, Intracytoplasmic / Q000379:methods*; D013094:Spermatozoa / Q000378:metabolism*; D017211:Treatment Failure
D015759:Ionomycin; D054801:Phosphoinositide Phospholipase C; C499234:Plcz1 protein, mouse