Abstract
Purpose
Placentas from spontaneous abortions and preterm deliveries have a higher prevalence of Human papillomavirus (HPV) compared to placentas from elective abortions and term births. The objective was to determine the effects of HPV-16 on the adhesion and implantation properties of early embryo trophoblasts.
Methods
Two-cell mouse embryos were cultured (medium G2, 5 % CO2, 37 °C) for 72–96 h and exposed to either HPV-16 rich SiHa cell lysates which were refrigerated after mechanical lysis, thawed lysates which had been frozen for freeze/thaw lysis method, or control medium, incubated (4–5 days) and evaluated by microscopy (N = 96 embryos, 3 repeated experiments). Trophoblasts were stained and images were digitized. Adhesion and dimension data were analyzed by Chi-square and t test, respectively.
Results
HPV-16 exposed embryos exhibited less adhesion through reduced implantation compared with the control (combined lysates 53.8 vs. 85.7 %, P < 0.05). Refrigerated and thawed lysate groups had similar reduced implantations (58.3 vs. 50.0 %). Of the embryos with implantation, 100 % in the refrigerated lysates were noted to have loose or abnormal adhesion. This was measured when embryos were noted to be lost after washes with HTF. There was no difference in trophoblast viability among the groups. Total trophoblast area was greater in the HPV-16 exposed frozen lysate group (1,881.8 ± 605.3 vs. control 848.8 ± 298.0 square units, mean ± SEM).
Conclusions
HPV-16 inhibited trophoblasts adhesion needed for normal implantation, but not embryo development. Total trophoblast spread was increased after HPV-16 exposure suggesting that HPV-16 altered trophoblast migration. These results suggest that HPV-16 may induce abnormal placental growth resulting in pregnancy wastage.
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Acknowledgments
The SiHa cells were kindly offered by Dr. Duerksen-Hughes and her lab, the Department of Basic Sciences in the Division of Biochemistry at Loma Linda University, CA, USA [15].
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Hong, L.J., Oshiro, B.T. & Chan, P.J. HPV-16 exposed mouse embryos: a potential model for pregnancy wastage. Arch Gynecol Obstet 287, 1093–1097 (2013). https://doi.org/10.1007/s00404-013-2711-5
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DOI: https://doi.org/10.1007/s00404-013-2711-5