JaLCDOI 10.18926/AMO/32892
FullText URL fulltext.pdf
Author Takagi, Koji| Yamada, Teruo| Miki, Yukari| Umegaki, Teruo| Nishimura, Makoto| Sasaki, Junzo|
Abstract To clarify the development of follicular growth and atresia in the immature ovary, rats. ovaries and blood were removed at fixed points during the period from 0 to 35 days after birth (Day 0 to Day 35). The ovaries were immunohistochemically examined, and blood concentrations of serum follicle-stimulating hormone (FSH) and estrogen (E) were measured. We investigated how time-course changes in follicular cell proliferation, estrogen receptor β (ERβ), apoptosis, and FSH and E concentrations are connected with follicular growth and atresia. Apoptosis was found in the ova from Day 0 to Day 3. On Day 15, apoptosis occurred in some granulosa cell nuclei in some follicles, but BrdU uptake and the presence of cyclin D2 and ER β could be observed in other granulosa cells. From Day 17, apoptosis increased in the follicular granulosa cells, and BrdU uptake and the presence of cyclin D2 and ERβ were decreased. Follicular atresia continued, reaching a peak on Day 30. Serum FSH and E concentrations increased until Day 15, then markedly decreased after Day 17. The mechanism of apoptosis in the ova from Day 0 to 3 has not been clarified. However, the onset of follicular atresia was caused by apoptotic degeneration from Days 15 to 17. These results showed that the oocytes were selected by apoptosis at 2 points in the time-course of the maturation of the ovary.
Keywords histology apoptosis proliferation estrogen follicle-stimulating hormone
Amo Type Original Article
Published Date 2007-10
Publication Title Acta Medica Okayama
Volume volume61
Issue issue5
Publisher Okayama University Medical School
Start Page 283
End Page 298
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 17971845
Web of Science KeyUT 000250431700006