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LEFTY2 expression and localization in rat oviduct during early pregnancy

Published online by Cambridge University Press:  21 December 2010

Martin Eduardo Argañaraz ,
Silvana Andrea Apichela  and
Dora Cristina Miceli
Martin Eduardo Argañaraz
Affiliation:
Instituto Superior de Investigaciones Biológicas (CONICET-UNT), Chacabuco 461, 4000, Tucumán, Argentina. Institute of Biology, College of Biochemistry, Chemistry and Pharmacy, Universidad Nacional de Tucuman, Chacabuco 461, 3°, Tucumán 4000, Argentina.
Silvana Andrea Apichela
Affiliation:
Instituto Superior de Investigaciones Biológicas (CONICET-UNT), Chacabuco 461, 4000, Tucumán, Argentina. Animal Production Department, College of Agriculture and Zootechnology, Universidad Nacional de Tucuman, Avenida Roca 1900, Tucumán 4000, Argentina.
Dora Cristina Miceli*
Affiliation:
Institute of Biology, College of Biochemistry, Chemistry and Pharmacy, Universidad Nacional de Tucuman, Chacabuco 461, 3°, Tucumán 4000, Argentina. Institute of Biology, College of Biochemistry, Chemistry and Pharmacy, Universidad Nacional de Tucuman, Chacabuco 461, 3°, Tucumán 4000, Argentina.
*
All correspondence to: D.C. Miceli. Institute of Biology, College of Biochemistry, Chemistry and Pharmacy, Universidad Nacional de Tucuman, Chacabuco 461, 3°, Tucumán 4000, Argentina. Tel: +54 381 4247752 ext 7099. Fax: +54 381 4107214. e-mail: [email protected]
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Summary

In mammals, fertilization and preimplantation embryo development occurs in the oviduct. Cross-talk between the developing embryos and the maternal reproductive tract has been described in such a way as to show that the embryos modulate the physiology and gene expression of the oviduct. Different studies have indicated that transforming growth factor beta (TGF-β) can modulate the oviductal microenvironment and act as an autocrine/paracrine factor on embryo development. LEFTY2, a novel member of the TGF-β superfamily is involved in the negative regulation of other cytokines in this family such as nodal, activin, BMPs, TGF-β1 and Vg1. In previous studies, we have reported that LEFTY2 is differentially expressed in the rat oviduct during pregnancy. In this study, we describe the temporal pattern of LEFTY2 in pregnant and non-pregnant rat oviduct by western blotting, which showed higher levels of LEFTY2 on day 4 of pregnancy, a time at which the embryos are ending their journey along the oviduct. The cellular location of LEFTY2 was assessed by immunohistochemistry, which showed immunolabelling in the cytoplasm and at the apical surface of the oviductal epithelial cells. The oviductal fluid also presented a 26 kDa band, which corresponds to the biologically active form of this protein, at the preimplantation period of pregnancy, indicating LEFTY2 secretion to the lumen. As LEFTY2 is expressed at a high level just before the embryos pass to the uterus, its biological effect might be relevant and significant for the preimplantation stage of embryo development in the oviduct. The fact that embryos do not express LEFTY2 at this stage of development supports this hypothesis.

Keywords

Embryo developmentLefty2OviductPregnancyTGF-β
Type
Research Article
Information
Zygote , Volume 20 , Issue 1 , February 2012 , pp. 53 - 60
Copyright
Copyright © Cambridge University Press 2010

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