Effect of Maternal Age on Hippo Pathway Related Gene Expressions and Protein Localization Pattern in Human Embryos

(Pages: 74-80)
Sahar Gharanfoli, M.Sc, 1,2Abdolhossein Shahverdi, Ph.D, 2Azam Dalman, Ph.D, 2Pooneh Ghaznavi, D.V.M, 2Hiva Alipour, Ph.D., 3Poopak Eftekhari-Yazdi, Ph.D., 2,*
Department of Developmental Biology, University of Science and Culture, Tehran, Iran
Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
Biomedicine Group, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
Department of Developmental Biology, University of Science and Culture, Tehran, Iran
Department of Embryology, Reproductive Biomedicine Research Center, Royan Institute for Reproductive Biomedicine, ACECR, Tehran, Iran
Biomedicine Group, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark
*Corresponding Address: P.O.Box: 16635-148 Department of Embryology Reproductive Biomedicine Research Center Royan Institute for Reproductive Biomedicine ACECR Tehran Iran Email:eftekhari@royaninstitute.org
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Gharanfoli Sahar, Shahverdi Abdolhossein, Dalman Azam, Ghaznavi Pooneh, Alipour Hiva, Eftekhari-Yazdi Poopak. Effect of Maternal Age on Hippo Pathway Related Gene Expressions and Protein Localization Pattern in Human Embryos. Cell J. 2020; 22(): 74-80.

Abstract

Objective

The Hippo pathway plays an important role in embryo development, and separation of trophectoderm (TE) and inner cell mass (ICM) cell lines. Therefore, this study investigated effect of maternal age on activity of Hippo pathway in human embryos.

Materials and Methods

In this experimental study, the developed up embryos to the blastocyst stage and the embryos whose growth stopped at the morula stage were collected from women aged 20-30 years old (young group, 94 embryos) and >37 years (old group, 89 embryos). Expression of OCT4, SOX2, CDX2, GATA3, YAP genes and the relevant proteins, in the both groups were evaluated using respectively quantitative reverse transcription-polymerase chain reaction (qRT-PCR) and immunofluorescence methods.

Results

There was no significant difference in the expression level of OCT4, SOX2, CDX2, GATA3 and YAP genes in blastocyst and morula stages, between the two groups. However, SOX2 and CDX2 gene expressions in morula stage embryos of the old group was statistically lower than that of the young group (P=0.007 and P=0.008, respectively). Additionally, in the embryos collected from women with >37 years of age, at the blastocyst stage, phospho-YAP (p-YAP) protein was found to be accumulated in the TE, but it was almost disappeared from the ICM. Additionally, in the old group, contrary to the expectation, YAP protein was expressed in the ICM, rather than TE.

Conclusion

The results of this study showed that YAP and P-YAP among the Hippo signalling pathway may be altered by increasing age.