Endometrial Receptivity and Implantation Mechanisms

The endometrium undergoes a coordinated sequence of morphological and molecular changes under the influence of oestrogen and progesterone to become receptive to an implanting embryo. During the mid-secretory phase, stromal cells differentiate into decidual cells while the luminal epithelium remodels to form specialised surface structures and cell–cell junctions adjust to allow controlled adhesion. A limited “window of implantation” marks the period in which the endometrium expresses an array of adhesion molecules, cytokines and growth factors that synchronise with blastocyst signalling. Fluid transport, immune cell modulation and mechanical properties of the lining also play essential roles in successful attachment, invasion and establishment of pregnancy.

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Endometrial Receptivity and Implantation Mechanisms publication trend

The graph below shows the total number of articles in endometrial receptivity and implantation mechanisms across all publications each year (not limited to Nature Index journals).

Technical terms

Endometrial receptivity: The state in which the uterine lining is biochemically and structurally prepared for embryo attachment.

Window of implantation: A brief mid-secretory phase interval when the endometrium is optimally receptive.

Decidualization: The transformation of stromal fibroblasts into specialised decidual cells supportive of early pregnancy.

Pinopodes: Transient apical protrusions on the luminal epithelium that mark and facilitate the receptive surface.

Integrins: Transmembrane receptors that mediate adhesion between cells and the extracellular matrix and transduce signals essential for implantation.

References

1. Adverse effect of assisted reproductive technology-related hyperoestrogensim on the secretion and absorption of uterine fluid in superovulating mice during the peri-implantation period. Frontiers in Endocrinology (2023).
2. Molecular Signaling Regulating Endometrium–Blastocyst Crosstalk. International Journal of Molecular Sciences (2019).
3. Alterations in Epithelial Cell Polarity During Endometrial Receptivity: A Systematic Review. Frontiers in Endocrinology (2020).
4. Direct Cell–Cell Interactions in the Endometrium and in Endometrial Pathophysiology. International Journal of Molecular Sciences (2018).
5. Hashimoto’s thyroiditis impairs embryo implantation by compromising endometrial morphology and receptivity markers in euthyroid mice. Reproductive Biology and Endocrinology (2019).
6. Electroacupuncture Improves Pregnancy Outcomes in Rats with Thin Endometrium by Promoting the Expression of Pinopode‐Related Molecules. BioMed Research International (2021).