Embryonic Trophectoderm Secretomics Reveals Chemotactic Migration and Intercellular Communication of Endometrial and Circulating MSCs in Embryonic Implantation.
Alexandra CalleVíctor ToribioMaria Yáñez-MóMiguel Ángel RamírezPublished in: International journal of molecular sciences (2021)
Embryonic implantation is a key step in the establishment of pregnancy. In the present work, we have carried out an in-depth proteomic analysis of the secretome (extracellular vesicles and soluble proteins) of two bovine blastocysts embryonic trophectoderm primary cultures (BBT), confirming different epithelial-mesenchymal transition stages in these cells. BBT-secretomes contain early pregnancy-related proteins and angiogenic proteins both as cargo in EVs and the soluble fraction. We have demonstrated the functional transfer of protein-containing secretome between embryonic trophectoderm and maternal MSC in vitro using two BBT primary cultures eight endometrial MSC (eMSC) and five peripheral blood MSC (pbMSC) lines. We observed that eMSC and pbMSC chemotax to both the soluble fraction and EVs of the BBT secretome. In addition, in a complementary direction, we found that the pattern of expression of implantation proteins in BBT-EVs changes depending on: (i) their epithelial-mesenchymal phenotype; (ii) as a result of the uptake of eMSC- or pbMSC-EV previously stimulated or not with embryonic signals (IFN-); (iii) because of the stimulation with the endometrial cytokines present in the uterine fluid in the peri-implantation period.
Keyphrases
- epithelial mesenchymal transition
- peripheral blood
- stem cells
- poor prognosis
- endometrial cancer
- bone marrow
- dendritic cells
- induced apoptosis
- mesenchymal stem cells
- binding protein
- signaling pathway
- pregnant women
- cell death
- long non coding rna
- transforming growth factor
- preterm birth
- oxidative stress
- body mass index
- cell cycle arrest
- label free