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. 2020 Nov 26;8:602097. doi: 10.3389/fcell.2020.602097

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Copyright © 2020 Jo, Yoon, Park, Lee, Kim, Kim, Kim, Lee, Lee, Lee, Kwon, Son, Lee, Kwon and Kim.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Effect of particulate matter (PM₁₀) exposure on mouse oocyte maturation and activation rate. (A) Timeline for the experimental schedule of PM₁₀ treatment. (B) Germinal vesicle (GV) oocytes were cultured at the indicated PM₁₀ concentrations for 12 h. PB (polar body) extrusion failed after PM₁₀ exposure. The yellow asterisks indicate oocytes arrested at MI. (C) Percentage of oocytes in each stage after maturation (12 h) of control (0 mg/mL) and PM₁₀-treated oocytes. (D) MII rate was calculated as the formation of one normal PB in the oocyte. (E) Impairment of activation after PM₁₀ exposure during in vitro maturation. Yellow asterisks indicate failed second PB extrusion in the oocyte at 2.5 h after Srcl2 treatment. (F) Activation rate of control and PM₁₀-treated MII oocytes. ***P < 0.001. n indicates the total number of cultured oocytes. Scale bars = 50 μm.