Abstract
Purpose
To study the differences in protein expression profiles of follicular fluid (FF) between controlled ovarian hyperstimulation (COH) and natural ovulatory cycles.
Methods
Twelve infertile women undergoing in vitro fertilization and embryo transfer (IVF–ET), with matched clinical information, were retrospectively recruited in the IVF center of our university hospital, including six undergoing COH and another six with natural cycles. FF was sampled from dominant follicles with mature oocytes. Protein expression profiles in each FF sample were analyzed respectively using two-dimensional gel electrophoresis. Differentially expressed proteins were identified using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and validated by western blotting. Differentially expressed proteins were further analyzed using Ingenuity Pathway Analysis (IPA) software.
Results
Two proteins were downregulated and 11 proteins were upregulated (change ≥1.5-fold, P < 0.05) in the COH group. We identified one down-egulated and seven upregulated proteins using MALDI-TOF MS. Four differentially expressed proteins, including transferrin, complement component C3 (C3), haptoglobin and alpha-1-antitrypsin (AAT), were further validated by rate nephelometry and western blotting analyses. The IPA analysis revealed a significant network involved in the humoral immune and inflammatory responses.
Conclusions
The eight differentially expressed proteins were related to immune and inflammatory responses in the ovary. Our results provide new insights into the influence of COH on follicular (spp) development and IVF outcomes.
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Acknowledgments
This work was supported by research grants from the National Science & Technology Pillar Program during the 12th Five-year Plan Period of China (No. 2012BAI32B04) and the Zhejiang Provincial Natural Science Foundation of China (No. LY13H040002).
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The authors declare that they have no conflict of interest.
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To study the effect in the follicular milieu of ovarian stimulation versus no stimulation, we analyzed protein expression profiles of follicular fluid from six women undergoing COH IVF and another six with natural cycles using two-dimensional gel electrophoresis. Eight differentially expressed proteins were identified and related to immune and inflammatory responses in the ovary.
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Wu, YT., Wu, Y., Zhang, JY. et al. Preliminary proteomic analysis on the alterations in follicular fluid proteins from women undergoing natural cycles or controlled ovarian hyperstimulation. J Assist Reprod Genet 32, 417–427 (2015). https://doi.org/10.1007/s10815-014-0419-5
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DOI: https://doi.org/10.1007/s10815-014-0419-5