Endometrial Function Enhancement in Assisted Reproductive Technologies

The endometrium plays a decisive role in the success of assisted reproductive technologies by providing the receptive lining into which an embryo implants. Optimal endometrial function depends on synchronised hormonal signalling, adequate vascular development and a finely tuned immune environment. In clinical practice, suboptimal endometrial thickness and impaired receptivity contribute to implantation failure and poor pregnancy rates. Strategies to enhance function have concentrated on mechanical, cellular and molecular approaches. Mechanical interventions such as hysteroscopic septum resection or low-dose aspirin seek to improve uterine blood flow, whereas cell-based therapies employ autologous platelet-rich plasma or growth factor infusions to promote tissue regeneration. At the molecular level, interventions with cytokines such as granulocyte colony-stimulating factor or modulators of autophagy and angiogenesis aim to restore the histological and functional integrity of the lining. Recent work has also identified key regulatory pathways involving insulin-like growth factor binding proteins, osteopontin and fibroblast growth factors. The global significance of these developments lies in their potential to broaden therapeutic options for patients with thin endometrium or recurrent implantation failure, thereby improving live birth rates in diverse clinical settings.

Research from Nature Portfolio

A prospective randomised trial investigated intrauterine administration of granulocyte colony-stimulating factor in patients with recurrent implantation failure despite normal endometrial thickness. The study revealed no significant improvement in endometrial thickness or clinical pregnancy and live birth rates compared with a placebo infusion, challenging earlier expectations that cytokine modulation alone would benefit this subgroup. The findings underscore the need for precise patient stratification and suggest that routine use of this cytokine in patients without evident endometrial deficiency may be unwarranted.

Endometrial Function Enhancement in Assisted Reproductive Technologies publication trend

The graph below shows the total number of articles in endometrial function enhancement in assisted reproductive technologies across all publications each year (not limited to Nature Index journals).

Technical terms

Endometrial receptivity: A transient state during the mid-luteal phase when the lining displays molecular and structural features conducive to embryo implantation.

Angiogenesis: The formation of new blood vessels within the endometrium, essential for nutrient delivery and decidualisation.

Platelet-rich plasma: Autologous plasma fraction with a high concentration of platelets that release growth factors to stimulate tissue repair.

Granulocyte colony-stimulating factor: A cytokine that promotes proliferation and mobilisation of neutrophils and may modulate endometrial proliferation and immune milieu.

Recurrent implantation failure: The failure to achieve pregnancy after several transfers of high-quality embryos, often linked to endometrial or immunological factors.

Thin endometrium: An endometrial thickness below the clinically accepted threshold (commonly <7 mm) associated with reduced implantation potential.

References

1. Intrauterine botulinum toxin A administration promotes endometrial regeneration mediated by IGFBP3-dependent OPN proteolytic cleavage in thin endometrium. Cellular and Molecular Life Sciences (2023).
2. Thrombocytes and Platelet-Rich Plasma as Modulators of Reproduction and Fertility. International Journal of Molecular Sciences (2023).
3. Efficacy of granulocyte colony-stimulating factor for infertility undergoing IVF: a systematic review and meta-analysis. Reproductive Biology and Endocrinology (2023).
4. Fibroblast growth factor 1 ameliorates thin endometrium in rats through activation of the autophagic pathway. Frontiers in Pharmacology (2023).
5. Intrauterine G-CSF Administration in Recurrent Implantation Failure (RIF): An Rct. Scientific Reports (2020).