埼玉医科大学雑誌 第31巻 第2号 (2004年4月) 95-101頁 ◇論文(図表を含む全文)は,PDFファイルとなっています.
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マウスおよびヒト胎盤におけるEPC-1/PEDF遺伝子の発現
臼井 真由美
埼玉医科大学総合医療センター産婦人科〔平成16年1月19日 受付〕
Expression of Early Population Doubling Level cDNA-1(EPC-1)/Pigment
Epithelium-derived Factor (PEDF) in Mice Placentae and Human Placentae
Mayumi Usui (Department of Obstetrics and Gynecology, Saitama Medical
Center, Saitama Medical School, Kawagoe, Saitama 350-8550, Japan)
Whereas there are many hypotheses on the causes of senescence of the
body, it has not yet been elucidated whether the placenta, which is to
be delivered from the mother after pregnancy for ten months, is also
subjected to senescent changes. Namely, is the senescence already started
in the placenta of late pregnancy, as it is a matured placenta?
In this paper, a gene, early population doubling level cDNA-1/pigment
epithelium-derived factor(EPC-1/PEDF), was used as a marker to examine
senescent changes. This gene has already been used as an ageing marker
for tissues although its expression level is fluctuated according to
cell cycle, ageing, cell differentiation, etc. We noticed that, when
the expression of EPC-1/PEDF mRNA was detected by RT-PCR, its level was
decreasing in the placenta of pregnant mice as pregnancy progressed.
Next we performed real-time quantitative PCR to detect EPC-1/PEDF mRNA
in 19 cases of human placentas at 27-40 weeks of gestation, obtained
upon elective cesarean deliveries done prior to the onset of labor. Its
expression was decreased as pregnancy progressed. The 8 cases of vaginal
delivery and the 5 cases of emergency cesarean deliveries after onset
of labor gave lower values than the cases subjected to elective cesarean
delivery. In cases of 8 dizygotic twins pregnancy at 32-38 weeks of gestation
including two cases of discordant twins, the expression of EPC-1/PEDF
mRNA was detected by real-time quantitative PCR. The placentae from the
smaller neonates gave extremely lower values than the normal placentae
from the lager ones.
These findings indicated that the placenta is an organ subjected to
senescent changes. The onset of labor may be related with ageing of the
placenta.
In addition, it was suggested that the placentas with intrauterine growth
retardation could show placental dysfunction accompanying senescent changes
in the uterus.
Keywords: EPC-1, PEDF, Placenta, Pregnancy, senescent, ageing, onset
of labor, Twin, IUGR
J Saitama Med School 2004;31:95-101
(Received January 19, 2004)
(C) 2004 The Medical Society of
Saitama Medical School
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