Zinc sparks induce physiochemical changes in the egg zona pellucida that prevent polyspermy
Abstract
During fertilization or chemically-induced egg activation, the mouse egg releases billions of zinc atoms in brief bursts known as ‘zinc sparks.’ The zona pellucida (ZP), a glycoprotein matrix surrounding the egg, is the first structure zinc ions encounter as they diffuse away from the plasma membrane. Following fertilization, the ZP undergoes changes described as ‘hardening’, which prevent multiple sperm from fertilizing the egg and thereby establish a block to polyspermy. A major event in zona hardening is cleavage of ZP2 proteins by ovastacin; however, the overall physiochemical changes contributing to zona hardening are not well understood. Using x-ray fluorescence microscopy, transmission and scanning electron microscopy, and biological function assays, we tested the hypothesis that zinc release contributes to ZP hardening. We found that the zinc content in the ZP increases by 300% following activation and that zinc exposure modulates the architecture of the ZP matrix. Importantly, zinc-induced structural changes of the ZP have a direct biological consequence; namely, they reduce the ability of sperm to bind to the ZP. These results provide a paradigm-shifting model in which fertilization-induced zinc sparks contribute to the polyspermy block by altering conformations of the ZP matrix. Finally, this adds a previously unrecognized factor, namelymore »
- Authors:
-
- Northwestern Univ., Evanston, IL (United States)
- Northwestern Univ., Evanston, IL (United States); Northwestern Univ. Atomic and Nanoscale Characterization Experimental Center, Evanston, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Northwestern Univ., Evanston, IL (United States); Northwestern Univ., Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); National Institutes of Health (NIH); W.M. Keck Foundation; Chicago Biomedical Consortium; USDOE
- OSTI Identifier:
- 1369059
- Grant/Contract Number:
- AC02-06CH11357
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Integrative Biology
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 2; Journal ID: ISSN 1757-9694
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 60 APPLIED LIFE SCIENCES; 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Que, Emily L., Duncan, Francesca E., Bayer, Amanda R., Philips, Steven J., Roth, Eric W., Bleher, Reiner, Gleber, Sophie C., Vogt, Stefan, Woodruff, Teresa K., and O’Halloran, Thomas V. Zinc sparks induce physiochemical changes in the egg zona pellucida that prevent polyspermy. United States: N. p., 2017.
Web. doi:10.1039/C6IB00212A.
Que, Emily L., Duncan, Francesca E., Bayer, Amanda R., Philips, Steven J., Roth, Eric W., Bleher, Reiner, Gleber, Sophie C., Vogt, Stefan, Woodruff, Teresa K., & O’Halloran, Thomas V. Zinc sparks induce physiochemical changes in the egg zona pellucida that prevent polyspermy. United States. https://doi.org/10.1039/C6IB00212A
Que, Emily L., Duncan, Francesca E., Bayer, Amanda R., Philips, Steven J., Roth, Eric W., Bleher, Reiner, Gleber, Sophie C., Vogt, Stefan, Woodruff, Teresa K., and O’Halloran, Thomas V. Thu .
"Zinc sparks induce physiochemical changes in the egg zona pellucida that prevent polyspermy". United States. https://doi.org/10.1039/C6IB00212A. https://www.osti.gov/servlets/purl/1369059.
@article{osti_1369059,
title = {Zinc sparks induce physiochemical changes in the egg zona pellucida that prevent polyspermy},
author = {Que, Emily L. and Duncan, Francesca E. and Bayer, Amanda R. and Philips, Steven J. and Roth, Eric W. and Bleher, Reiner and Gleber, Sophie C. and Vogt, Stefan and Woodruff, Teresa K. and O’Halloran, Thomas V.},
abstractNote = {During fertilization or chemically-induced egg activation, the mouse egg releases billions of zinc atoms in brief bursts known as ‘zinc sparks.’ The zona pellucida (ZP), a glycoprotein matrix surrounding the egg, is the first structure zinc ions encounter as they diffuse away from the plasma membrane. Following fertilization, the ZP undergoes changes described as ‘hardening’, which prevent multiple sperm from fertilizing the egg and thereby establish a block to polyspermy. A major event in zona hardening is cleavage of ZP2 proteins by ovastacin; however, the overall physiochemical changes contributing to zona hardening are not well understood. Using x-ray fluorescence microscopy, transmission and scanning electron microscopy, and biological function assays, we tested the hypothesis that zinc release contributes to ZP hardening. We found that the zinc content in the ZP increases by 300% following activation and that zinc exposure modulates the architecture of the ZP matrix. Importantly, zinc-induced structural changes of the ZP have a direct biological consequence; namely, they reduce the ability of sperm to bind to the ZP. These results provide a paradigm-shifting model in which fertilization-induced zinc sparks contribute to the polyspermy block by altering conformations of the ZP matrix. Finally, this adds a previously unrecognized factor, namely zinc, to the process of ZP hardening.},
doi = {10.1039/C6IB00212A},
journal = {Integrative Biology},
number = 2,
volume = 9,
place = {United States},
year = {Thu Jan 19 00:00:00 EST 2017},
month = {Thu Jan 19 00:00:00 EST 2017}
}
Web of Science
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