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Presence and distribution of E-cadherin in the 4-cell golden hamster embryo. Effect of maternal age and parity

Published online by Cambridge University Press:  01 August 2008

A. Trejo
Affiliation:
Departamento de Biologia de la Reproduccion, Universidad Autonoma Metropolitana – Iztapalapa. Av. San Rafael Atlixco N° 186 Col. Vicentina, Iztapalapa. Mexico, D.F., C.P. 09340.
D. Ambriz*
Affiliation:
Universidad Autonoma Metropolitana - Iztapalapa, Av. San Rafael Atlixco No. 186 Col. Vicentina, Iztapalapa. Mexico, D.F., C.P. 09340. Departamento de Biologia de la Reproduccion, Universidad Autonoma Metropolitana – Iztapalapa. Av. San Rafael Atlixco N° 186 Col. Vicentina, Iztapalapa. Mexico, D.F., C.P. 09340.
M. C. Navarro-Maldonado
Affiliation:
Departamento de Biologia de la Reproduccion, Universidad Autonoma Metropolitana – Iztapalapa. Av. San Rafael Atlixco N° 186 Col. Vicentina, Iztapalapa. Mexico, D.F., C.P. 09340.
E. Mercado
Affiliation:
Departamento de Biologia de la Reproduccion, Universidad Autonoma Metropolitana – Iztapalapa. Av. San Rafael Atlixco N° 186 Col. Vicentina, Iztapalapa. Mexico, D.F., C.P. 09340.
A. Rosado
Affiliation:
Departamento de Biologia de la Reproduccion, Universidad Autonoma Metropolitana – Iztapalapa. Av. San Rafael Atlixco N° 186 Col. Vicentina, Iztapalapa. Mexico, D.F., C.P. 09340.
*
All correspondence to Demetrio Ambriz. Universidad Autonoma Metropolitana - Iztapalapa, Av. San Rafael Atlixco No. 186 Col. Vicentina, Iztapalapa. Mexico, D.F., C.P. 09340. Tel: +55 58044706. Fax: +55 58044930. e-mail: deme@xanum.uam.mx

Summary

Maternal age dependency of gestation time in hamster and in other mammals is a well demonstrated fact. We have recently shown that adult nulliparous and multiparous hamster females show significant asynchrony and retard on early embryo development (from two blastomeres to morula stages) when compared with nulliparous young females. The number of cell–cell adhesions between blastomeres in early embryo development has been reported to be a good indication of the ability of embryos to cleave and develop. In this work we studied, by indirect immunofluorescence, the presence and distribution of E-cadherin in 4-cell embryos obtained from nulliparous young (NYF), nulliparous adult (NAF) and multiparous adult (MAF) hamster females. Distribution and intensity of fluorescence was observed and registered using confocal microscopy. Staining intensities for E-cadherin were quantified by computed densitometry in the free membrane regions, in the cytoplasm region and in the cell–cell adhesion zones of each embryo. E-Cadherin in all the studied zones was significantly higher (p < 0.01) in NYF. Cadherin concentration in the intercellular membranes was always statistically higher (p < 0.05) than in the free membrane regions. An appreciable concentration of E-cadherin was found in the cytoplasm of the 4-cell embryos obtained from the three groups of females, but was significantly higher in NYF. No statistical differences were observed in any of the parameters studied between NAF and MAF. Our results seem to indicate that changes in the reproductive behavior related to age and/or multiparity may be correlated with changes in the processes related to intercellular adhesions during early cleavage.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2008

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