title: Age-Associated Lipidome Changes in Metaphase II Mouse Oocytes.
abstract: The quality of mammalian oocytes declines with age, which negatively affects fertilization and developmental potential. The aging process often accompanies damages to macromolecules such as proteins, DNA, and lipids. To investigate if aged oocytes display an altered lipidome compared to young oocytes, we performed a global lipidomic analysis between oocytes from 4-week-old and 42 to 50-week-old mice. Increased oxidative stress is often considered as one of the main causes of cellular aging. Thus, we set up a group of 4-week-old oocytes treated with hydrogen peroxide (H2O2), a commonly used oxidative stressor, to compare if similar lipid species are altered between aged and oxidative-stressed oocytes. Between young and aged oocytes, we identified 26 decreased and 6 increased lipids in aged oocytes; and between young and H2O2-treated oocytes, we identified 35 decreased and 26 increased lipids in H2O2-treated oocytes. The decreased lipid species in these two comparisons were overlapped, whereas the increased lipid species were distinct. Multiple phospholipid classes, phosphatidic acid (PA), phosphatidylinositol (PI), phosphatidylserine (PS), and lysophosphatidylserine (LPS) significantly decreased both in H2O2-treated and aged oocytes, suggesting that the integrity of plasma membrane is similarly affected under these conditions. In contrast, a dramatic increase in diacylglycerol (DG) was only noted in H2O2-treated oocytes, indicating that the acute effect of H2O2-caused oxidative stress is distinct from aging-associated lipidome alteration. In H2O2-treated oocytes, the expression of lysophosphatidylcholine acyltransferase 1 increased along with increases in phosphatidylcholine. Overall, our data reveal that several classes of phospholipids are affected in aged oocytes, suggesting that the integrity of plasma membrane is associated with maintaining fertilization and developmental potential of mouse oocytes.
authors.affiliation: Department of Applied Chemistry, The Institute of Natural Science, Kyung Hee University, Yongin, Gyeonggi-do, Korea.
authors.forename: Hyuck Jun
authors.initials: HJ
authors.lastname: Mok
authors.affiliation: Department of Biomedical Science & Technology, Institute of Biomedical Science & Technology, Konkuk University, Seoul, Korea.
authors.forename: Hyejin
authors.initials: H
authors.lastname: Shin
authors.affiliation: Department of Applied Chemistry, The Institute of Natural Science, Kyung Hee University, Yongin, Gyeonggi-do, Korea.
authors.forename: Jae Won
authors.initials: JW
authors.lastname: Lee
authors.affiliation: Department of Biomedical Science & Technology, Institute of Biomedical Science & Technology, Konkuk University, Seoul, Korea.
authors.forename: Geun-Kyung
authors.initials: GK
authors.lastname: Lee
authors.affiliation: Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea.
authors.forename: Chang Suk
authors.initials: CS
authors.lastname: Suh
authors.affiliation: Department of Applied Chemistry, The Institute of Natural Science, Kyung Hee University, Yongin, Gyeonggi-do, Korea.
authors.forename: Kwang Pyo
authors.initials: KP
authors.lastname: Kim
authors.affiliation: Department of Biomedical Science & Technology, Institute of Biomedical Science & Technology, Konkuk University, Seoul, Korea.|Department of Veterinary Medicine, Konkuk University, Seoul, Korea.
authors.forename: Hyunjung Jade
authors.initials: HJ
authors.lastname: Lim
mesh_terms: D000818:Animals; D016922:Cellular Senescence / Q000235:genetics*; D050356:Lipid Metabolism / Q000235:genetics*; D008677:Metaphase / Q000235:genetics; D051379:Mice; D009865:Oocytes / Q000378:metabolism*; D010084:Oxidation-Reduction; D018384:Oxidative Stress / Q000235:genetics*