Effect of maturation on the expression of aquaporin 3 in mouse oocyte.
This study aimed to investigate whether aquaporin 3 (Aqp3) mRNAs are expressed in immature oocytes and altered during in vitro maturation process. Five- to 6-week-old female ICR mice were primed by gonadotropin for 24 and 48 h. Immature oocytes obtained 48 h after priming were also matured in vitro for 17 to 18 h. In vivo matured oocytes were obtained after 48 h priming followed by hCG injection. Total RNAs were extracted from 80 to 150 oocytes in each experimental group, and the levels of Aqp3 mRNA were quantified by real-time reverse transcriptase polymerase chain reaction. The experiments were repeated twice using different oocytes. The Aqp3 mRNA was expressed in immature oocytes, as well as in in vitro and in vivo matured oocytes. The expression level was higher in immature oocytes obtained 48 h after priming (17.2 ± 8.6, mean ± SD) than those with no priming (5.7 ± 0.8) or obtained 24 h after priming (2.5 ± 0.8). The expression of Aqp3 mRNA decreased after in vitro maturation (1.2 ± 0.5), which was similar to in vivo matured oocytes (1.0 ± 0.0). Our work demonstrated that Aqp3 mRNA expression increased during the development of immature oocyte but decreased after completion of in vitro maturation. The results indicate that AQP3 is certainly needed for the acquisition of immature oocytes' full growing potential within antral follicles.
Jo
Jun Woo
JW
Seoul National University Bundang Hospital, Seongnam, Gyeonggi 463-707, Korea.
Jee
Byung Chul
BC
Suh
Chang Suk
CS
Kim
Seok Hyun
SH
Choi
Young Min
YM
Kim
Jung Gu
JG
Moon
Shin Yong
SY
D000818:Animals; D051400:Aquaporin 3 / Q000235:genetics* / Q000378:metabolism; D005260:Female; D051379:Mice; D008813:Mice, Inbred ICR; D009865:Oocytes / Q000166:cytology / Q000378:metabolism*; D006080:Ovarian Follicle / Q000187:drug effects / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism
C496028:Aqp3 protein, mouse; D012333:RNA, Messenger; D051400:Aquaporin 3