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Toxic effects of Hoechst staining and UV irradiation on preimplantation development of parthenogenetically activated mouse oocytes

Karen Versieren (UGent) , Björn Heindryckx (UGent) , Chen Qian (UGent) , Jan Gerris (UGent) and Petra De Sutter (UGent)
(2014) ZYGOTE. 22(1). p.32-40
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Abstract
Parthenogenetic activation of oocytes is a helpful tool to obtain blastocysts, of which the inner cell mass may be used for derivation of embryonic stem cells. In order to improve activation and embryonic development after parthenogenesis, we tried to use sperm injection and subsequent removal of the sperm head to mimic the natural Ca2+ increases by release of the oocyte activating factor. Visualization of the sperm could be accomplished by Hoechst staining and ultraviolet (UV) light irradiation. To exclude negative effects of this treatment, we examined toxicity on activated mouse oocytes. After activation, oocytes were incubated in Hoechst 33342 or 33258 stain and exposed to UV irradiation. The effects on embryonic development were evaluated. Our results showed that both types of Hoechst combined with UV irradiation have toxic effects on parthenogenetically activated mouse oocytes. Although activation and cleavage rate were not affected, blastocyst formation was significantly reduced. Secondly, we used MitoTracker staining for removal of the sperm. Sperm heads were stained before injection and removed again after 1 h. However, staining was not visible anymore in all oocytes after intracytoplasmic sperm injection. In case the sperm could be removed, most oocytes died after 1 day. As MitoTracker was also not successful, alternative methods for sperm identification should be investigated.
Keywords
INTRACYTOPLASMIC SPERM INJECTION, TRIGGERS CA2+ OSCILLATIONS, UV irradiation, IN-VITRO DEVELOPMENT, PHOSPHOLIPASE-C-ZETA, EMBRYONIC STEM-CELLS, CELL NUCLEAR TRANSFER, Preimplantation development, Parthenogenesis, Hoechst, Artificial activation, EGG ACTIVATION, PLC-ZETA, ULTRAVIOLET-IRRADIATION, CALCIUM

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MLA
Versieren, Karen, Björn Heindryckx, Chen Qian, et al. “Toxic Effects of Hoechst Staining and UV Irradiation on Preimplantation Development of Parthenogenetically Activated Mouse Oocytes.” ZYGOTE 22.1 (2014): 32–40. Print.
APA
Versieren, K., Heindryckx, B., Qian, C., Gerris, J., & De Sutter, P. (2014). Toxic effects of Hoechst staining and UV irradiation on preimplantation development of parthenogenetically activated mouse oocytes. ZYGOTE, 22(1), 32–40.
Chicago author-date
Versieren, Karen, Björn Heindryckx, Chen Qian, Jan Gerris, and Petra De Sutter. 2014. “Toxic Effects of Hoechst Staining and UV Irradiation on Preimplantation Development of Parthenogenetically Activated Mouse Oocytes.” Zygote 22 (1): 32–40.
Chicago author-date (all authors)
Versieren, Karen, Björn Heindryckx, Chen Qian, Jan Gerris, and Petra De Sutter. 2014. “Toxic Effects of Hoechst Staining and UV Irradiation on Preimplantation Development of Parthenogenetically Activated Mouse Oocytes.” Zygote 22 (1): 32–40.
Vancouver
1.
Versieren K, Heindryckx B, Qian C, Gerris J, De Sutter P. Toxic effects of Hoechst staining and UV irradiation on preimplantation development of parthenogenetically activated mouse oocytes. ZYGOTE. 2014;22(1):32–40.
IEEE
[1]
K. Versieren, B. Heindryckx, C. Qian, J. Gerris, and P. De Sutter, “Toxic effects of Hoechst staining and UV irradiation on preimplantation development of parthenogenetically activated mouse oocytes,” ZYGOTE, vol. 22, no. 1, pp. 32–40, 2014.
@article{4400101,
  abstract     = {Parthenogenetic activation of oocytes is a helpful tool to obtain blastocysts, of which the inner cell mass may be used for derivation of embryonic stem cells. In order to improve activation and embryonic development after parthenogenesis, we tried to use sperm injection and subsequent removal of the sperm head to mimic the natural Ca2+ increases by release of the oocyte activating factor. Visualization of the sperm could be accomplished by Hoechst staining and ultraviolet (UV) light irradiation. To exclude negative effects of this treatment, we examined toxicity on activated mouse oocytes. After activation, oocytes were incubated in Hoechst 33342 or 33258 stain and exposed to UV irradiation. The effects on embryonic development were evaluated. Our results showed that both types of Hoechst combined with UV irradiation have toxic effects on parthenogenetically activated mouse oocytes. Although activation and cleavage rate were not affected, blastocyst formation was significantly reduced. Secondly, we used MitoTracker staining for removal of the sperm. Sperm heads were stained before injection and removed again after 1 h. However, staining was not visible anymore in all oocytes after intracytoplasmic sperm injection. In case the sperm could be removed, most oocytes died after 1 day. As MitoTracker was also not successful, alternative methods for sperm identification should be investigated.},
  author       = {Versieren, Karen and Heindryckx, Björn and Qian, Chen and Gerris, Jan and De Sutter, Petra},
  issn         = {0967-1994},
  journal      = {ZYGOTE},
  keywords     = {INTRACYTOPLASMIC SPERM INJECTION,TRIGGERS CA2+ OSCILLATIONS,UV irradiation,IN-VITRO DEVELOPMENT,PHOSPHOLIPASE-C-ZETA,EMBRYONIC STEM-CELLS,CELL NUCLEAR TRANSFER,Preimplantation development,Parthenogenesis,Hoechst,Artificial activation,EGG ACTIVATION,PLC-ZETA,ULTRAVIOLET-IRRADIATION,CALCIUM},
  language     = {eng},
  number       = {1},
  pages        = {32--40},
  title        = {Toxic effects of Hoechst staining and UV irradiation on preimplantation development of parthenogenetically activated mouse oocytes},
  url          = {http://dx.doi.org/10.1017/S0967199412000251},
  volume       = {22},
  year         = {2014},
}

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