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2017 ; 12
(4
): e0175150
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English Wikipedia
The location of "8"-shaped hatching influences inner cell mass formation in mouse
blastocysts
#MMPMID28384351
Onodera Y
; Takahashi K
; Goto M
; Anzai M
; Ono N
; Shirasawa H
; Sato W
; Miura H
; Sato N
; Sato A
; Kumazawa Y
; Terada Y
PLoS One
2017[]; 12
(4
): e0175150
PMID28384351
show ga
The hatching of a blastocyst where the blastocyst portions on the inside and the
outside of the zona pellucida feature a figure-of-eight shape is termed
"8"-shaped hatching; this type of hatching has been reported to affect the proper
presentation of the inner cell mass (ICM) in both human and mouse embryos. Here,
our aim was to investigate the factors that affect ICM presentation during
"8"-shaped hatching. We performed IVF by using B6D2F1 female mice and ICR male
mice, and used the 104 captured blastocysts. Embryos were maintained in KSOM at
37°C in a 5% CO2, 5% O2, and 90% N2 environment, and their growth behavior was
monitored individually and continuously using time-lapse cinematography. At 120 h
after insemination, embryos were immunostained and examined under a confocal
microscope. We used the hatching form to identify "8"-shaped hatching, and we
classified the "8"-shaped-hatching blastocysts into two groups, one in which the
hatching site was near the ICM center, and the other in which the hatching site
was far from the ICM center. We measured each group for ICM size and the number
of Oct3/4-positive cells. Of the 95 hatching or hatched embryos, 74 were
"8"-shaped-hatching blastocysts, and in these embryos, the ICM was significantly
wider when the hatching site was near the ICM than when the hatching site was far
from the ICM (P = 0.0091). Moreover, in the "8"-shaped-hatching blastocysts in
which the ICM was included in the blastocyst portion outside the zona
pellucida-the portion defined as the "outside blastocyst"-after the collapse of
this outside blastocyst, the ICM adhered to the trophectoderm of the outside
blastocyst, opposite the hatching site. Our results indicate that in
"8"-shaped-hatching blastocysts, the hatching site and the collapse of outside
blastocyst affect ICM formation. Thus, the assessment of "8"-shaped hatching
behaviors could yield indices for accurately evaluating embryo quality.