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Expression of TGF-beta1, TGF-beta2, TGF-beta3 and the receptors TGF-betaRI and TGF-betaRII in placentomes of artificially inseminated and nuclear transfer derived bovine pregnancies.

Abstract：

:Bovine nuclear transfer pregnancies are characterized by a high incidence of placental abnormalities, notably, increased placentome size and deficiencies in trophoblast cell function and establishment of placental vasculature. Alterations in gene expression during placental growth and development may contribute to the appearance of large placentomes in pregnancies derived from nuclear transfer. The placenta synthesizes a number of cytokines and growth factors, including the transforming growth factor-betas (TGF-betas) that are involved in the establishment, maintenance and/or regulation of pregnancy. All forms of TGF-beta and their receptors are present at the fetal-maternal interface of the bovine placentome, where they are thought to play an important role in regulating growth, differentiation, and function of the placenta. Using real-time RT-PCR, we have examined the expression of TGF-beta1, TGF-beta2, TGF-beta3 and the receptors TGF-betaRI and TGF-betaRII in placentomes of artificially inseminated (AI) and nuclear transfer (NT)-derived bovine pregnancies at days 50, 100 and 150 of gestation. TGF-beta1, TGF-beta2 and TGF-beta3 mRNA expression increased by 2.0-2.8-fold, while TGF-betaRI and TGF-betaRII mRNA expression decreased by 1.7-2.0-fold in NT placentomes compared to AI controls at all gestational ages examined. These findings indicate that NT placentomes may be resistant to the growth suppressive effects of TGF-betas and could contribute to the placental proliferative abnormalities observed in NT-derived placentas. Alternatively, deficiencies in placentation may provide a mechanism whereby TGF-betas are dysregulated in NT pregnancies.

journal_name

Placenta

journal_title

Placenta

authors

Ravelich SR,Shelling AN,Wells DN,Peterson AJ,Lee RS,Ramachandran A,Keelan JA

doi

10.1016/j.placenta.2005.03.002

keywords:

subject

Has Abstract

pub_date

2006-02-01 00:00:00

pages

307-16

issue

2-3

eissn

0143-4004

issn

1532-3102

pii

S0143-4004(05)00114-1

journal_volume

27

pub_type

杂志文章

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