Ovarian aging has been associated with increased levels of reactive oxygen
species and the deficiencies of antioxidant defense. The antioxidant peroxiredoxin 4 (Prdx4),
as a member of Prdx protein family, controls cellular oxidative stress by reducing H2O2 levels.
In previous studies, we provided evidence that Prdx4 was abundantly expressed in mouse and human ovaries
and expression of Prdx4 in matured follicles was higher than that in immatured follicles. Accordingly, we
speculated that Prdx4 expression could be associated with follicle development and it may be as a part of the
antioxidative mechanism in follicular development. In this study, we demonstrated that Prdx4 was mainly
expressed in the granulosa cells of mouse ovaries and the expression levels significantly increased along
development of follicles. However, the expression levels of Prdx4 decreased when mice reached the aged
stage (18 months old). Likewise a similar pattern that was observed in the mice study was also found in human
ovaries where Prdx4 was expressed lower in premenopausal women than young women. Subsequent in vitro
experiments indicated that Prdx4 mRNA and protein levels both increased with H2O2 in a concentrationdependent
manner, but decreased rapidly with high concentration of H2O2, and the changes were closely
related to cell proliferation. Taken together, these findings argue our understanding on the role of oxidative
stress and antioxidant in follicular development and ovarian aging.
Keywords: Antioxidant, follicular development, granulosa cell, ovarian aging, oxidative stress, peroxiredoxin 4.
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