Heparin-Binding Epidermal Growth Factor-Like Growth Factor Enhances Aquaporin 3 Expression and Function During Mouse Embryo Implantation

In: Reproductive Sciences · 2016 · vol. 24(3) , pp. 463–470 · doi:10.1177/1933719116657893 · PMID:27436370 · W2499402382
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HB-EGF stimulates EGFR/ERK signaling to promote aquaporin 3 expression in trophoblastic cells, which is vital for HB-EGF-induced embryo implantation.

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This study examined how heparin-binding epidermal growth factor-like growth factor (HB-EGF) regulates aquaporin 3 (AQP3) expression and trophoblast behavior during mouse embryo implantation using an in vitro co-culture model in which blastocysts were grown on uterine endometrial cell monolayers treated with different HB-EGF concentrations. HB-EGF increased AQP3 expression in a dose-dependent manner and promoted blastocyst attachment and outgrowth, while pharmacologic inhibition of AQP3 activity with copper sulfate suppressed both attachment and outgrowth. Mechanistically, HB-EGF induced EGFR phosphorylation and downstream ERK activation, and blockade of EGFR (PD153035) or ERK (U0126) inhibited AQP3 expression as well as attachment and outgrowth; the authors’ key limitation is the use of an in vitro co-culture system to mimic in vivo implantation. This paper does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via keyword match in the upstream search index.

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Abstract

Aquaporin 3 (AQP3) is highly expressed in peri-implantation blastocyst trophoblastic cells, indicating its role in cytotrophoblast invasion during embryo implantation. However, the mechanism underlying the regulation of AQP3 expression during embryo implantation remains unclear. In this study, an in vitro co-culture system of blastocysts on a monolayer of uterine endometrial cells was used to mimic in vivo process of embryo attachment and invasion to uterine endometrium and treated with different concentrations of heparin-binding epidermal growth factor-like growth factor (HB-EGF). The results showed that HB-EGF enhanced AQP3 expression in blastocysts in a dose-dependent manner and promoted the attachment and outgrowth of blastocysts on the monolayer of uterine endometrial cells. When the AQP3 activity was inhibited by copper sulfate, both the attachment and outgrowth of blastocysts were inhibited. Furthermore, HB-EGF induced the phosphorylation of EGF receptor (EGFR) and extracellular signal-regulated kinase (ERK). PD153035 (EGFR inhibitor) and U0126 (ERK inhibitor) inhibited AQP3 expression and also the attachment and outgrowth of blastocysts. Collectively, our findings provide the first evidence that HB-EGF stimulates EGFR/ERK signaling to promote AQP3 expression in trophoblastic cells, and AQP3 plays a vital role in HB-EGF-induced embryo implantation.
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Abstract

Aquaporin 3 (AQP3) is highly expressed in peri-implantation blastocyst trophoblastic cells, indicating its role in cytotrophoblast invasion during embryo implantation. However, the mechanism underlying the regulation of AQP3 expression during embryo implantation remains unclear. In this study, an in vitro co-culture system of blastocysts on a monolayer of uterine endometrial cells was used to mimic in vivo process of embryo attachment and invasion to uterine endometrium and treated with different concentrations of heparin-binding epidermal growth factor-like growth factor (HB-EGF). The results showed that HB-EGF enhanced AQP3 expression in blastocysts in a dose-dependent manner and promoted the attachment and outgrowth of blastocysts on the monolayer of uterine endometrial cells. When the AQP3 activity was inhibited by copper sulfate, both the attachment and outgrowth of blastocysts were inhibited. Furthermore, HB-EGF induced the phosphorylation of EGF receptor (EGFR) and extracellular signal-regulated kinase (ERK). PD153035 (EGFR inhibitor) and U0126 (ERK inhibitor) inhibited AQP3 expression and also the attachment and outgrowth of blastocysts. Collectively, our findings provide the first evidence that HB-EGF stimulates EGFR/ERK signaling to promote AQP3 expression in trophoblastic cells, and AQP3 plays a vital role in HB-EGF-induced embryo implantation. Similar content being viewed by others

References

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Sci. 24, 463–470 (2017). https://doi.org/10.1177/1933719116657893 Published: Issue date: DOI: https://doi.org/10.1177/1933719116657893

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