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Endometrial secretion analysis identifies a cytokine profile predictive of pregnancy in IVF
C M Boomsma1, A Kavelaars, M J C Eijkemans
1Department of Reproductive Medicine and Gynecology, University Medical Center Utrecht, F05.126, PO Box 85500, 3508 GA, Utrecht, The Netherlands. c.m.boomsma@umcutrecht.nl
Insights
Endometrial fluid analysis can predict pregnancy success after IVF. Specific cytokine profiles in secretions, like MCP-1 and IL-1beta, are linked to implantation and clinical pregnancy rates.
Area of Science:
- Reproductive biology and medicine
- In vitro fertilization (IVF) research
- Implantation science
Background:
- Human endometrial-embryonic interactions are crucial for successful pregnancy.
- Traditional endometrial sampling methods can disrupt the implantation process.
- Endometrial secretion analysis offers a non-disruptive alternative for studying implantation.
Purpose of the Study:
- To identify a cytokine profile in endometrial secretions predictive of embryo implantation and clinical pregnancy.
- To evaluate the utility of non-disruptive endometrial fluid analysis in IVF outcomes.
- To explore novel biomarkers for successful pregnancy following assisted reproductive technologies.
Main Methods:
- Prospective cohort study of 210 women undergoing IVF.
- Aspiration of endometrial secretions immediately prior to embryo transfer.
- Multiplex immunoassay analysis of 17 soluble regulators, including cytokines like IL-1beta, MCP-1, and VEGF.
- Monitoring of human Chorionic Gonadotropin (hCG) levels via daily urine samples to confirm implantation.
Main Results:
- Monocyte chemo-attractant protein-1 (MCP-1) and Interferon-gamma-inducible 10 kDa protein (IP-10) levels were significantly associated with implantation.
- Interleukin-1beta (IL-1beta) and Tumor Necrosis Factor-alpha (TNF-alpha) levels were significantly associated with clinical pregnancy.
- The predictive value of IL-1beta and TNF-alpha for pregnancy was comparable and additive to embryo quality.
Conclusions:
- Endometrial secretion cytokine profiling is a novel and non-disruptive method to investigate endometrial receptivity.
- Specific cytokine profiles in endometrial fluid can predict the likelihood of achieving clinical pregnancy after IVF.
- This approach enhances our understanding of the endometrium's role in supporting early pregnancy.
Background:
The study of human endometrial-embryonic interactions is complicated by the disruptive impact of endometrial sample collection on the process of implantation itself. Endometrial secretion analysis is a novel technique, non-disruptive to implantation. The primary aim of this prospective cohort study was to explore whether a cytokine profile predictive of implantation and clinical pregnancy can be identified in endometrial secretions aspirated immediately prior to embryo transfer following IVF.
Methods:
Endometrial secretions, aspirated immediately prior to embryo transfer from 210 women undergoing IVF, were analyzed using a multiplex immunoassay for 17 soluble regulators of implantation, namely interleukin (IL)-1beta, IL-5, IL-6, IL-10, IL-12, IL-15, IL-17, IL-18, tumor necrosis factor (TNF)-alpha, interferon (IFN)-gamma, macrophage migration inhibitory factor, eotaxin, IFN-gamma-inducible 10 kDa protein (IP-10), monocyte chemo-attractant protein-1 (MCP-1), Dickkopf homolog 1, heparin-binding epidermal growth factor and vascular endothelial growth factor (VEGF). In order to detect implantation, daily urine samples were collected after embryo transfer, and human Chorionic Gonadotropin (hCG) concentrations were analyzed by an immunoassay.
Results:
Multivariable logistic regression analysis revealed significant associations (negative and positive association, respectively) between MCP-1 (P = 0.005) and IP-10 (P = 0.037) levels and implantation, and between IL-1beta (P = 0.047) and TNF-alpha (P = 0.023) levels and clinical pregnancy. The predictive value for pregnancy of IL-1beta and TNF-alpha was observed to be equivalent and additive to that of embryo quality.
Conclusions:
Endometrial secretion cytokine profiling offers a novel, non-disruptive approach to study the role of the endometrium in human embryo implantation and identifies a profile which appears to be conducive to clinical pregnancy.
Clinical Trial Registration:
www.clinicaltrials.gov (nCT00264992).
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