Uterine FK506-binding protein 52 (FKBP52)-peroxiredoxin-6 (PRDX6) signaling protects pregnancy from overt oxidative stress.
Immunophilin FK506-binding protein 52 (FKBP52) is a cochaperone that binds to the progesterone receptor (PR) to optimize progesterone (P(4))-PR signaling. We recently showed that Fkbp52-deficient (Fkbp52(-/-)) mice have reduced uterine PR responsiveness and implantation failure which is rescued by excess P(4) supplementation in a genetic background-dependent manner. This finding led us to hypothesize that FKBP52 has functions in addition to optimizing PR activity. Using proteomics analysis, we found that uterine levels of peroxiredoxin-6 (PRDX6), a unique antioxidant, are significantly lower in Fkbp52(-/-) mice than in WT and PR-null (Pgr(-/-)) mice. We also found that Fkbp52(-/-) mice with reduced uterine PRDX6 levels are susceptible to paraquat-induced oxidative stress (OS), leading to implantation failure even with P(4) supplementation. The same dose of paraquat did not interfere with implantation in WT mice. Moreover, treatment with antioxidants alpha-tocopherol and N-acetylcysteine (NAC) attenuated paraquat-induced implantation failure in P(4)-treated Fkbp52(-/-) mice. Functional analyses using mouse embryonic fibroblasts show that Fkbp52 deficiency associated with reduced PRDX6 levels promotes H(2)O(2)-induced cell death, which is reversed by the addition of NAC or by forced expression of PRDX6, suggesting that Fkbp52 deficiency diminishes the threshold against OS by reducing PRDX6 levels. These findings provide evidence that heightened uterine OS in Fkbp52(-/-) females with reduced PRDX6 levels induces implantation failure even in the presence of excess P(4). This study shows that FKBP52-PRDX6 signaling protects pregnancy from overt OS.
Hirota
Yasushi
Y
Division of Reproductive Sciences, The Perinatal Institute, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, Cincinnati, OH 45229, USA.
Acar
Nuray
N
Tranguch
Susanne
S
Burnum
Kristin E
KE
Xie
Huirong
H
Kodama
Ako
A
Osuga
Yutaka
Y
Ustunel
Ismail
I
Friedman
David B
DB
Caprioli
Richard M
RM
Daikoku
Takiko
T
Dey
Sudhansu K
SK
D000818:Animals; D015152:Blotting, Northern; D015153:Blotting, Western; D010064:Embryo Implantation / Q000187:drug effects; D004717:Endometrium / Q000166:cytology / Q000378:metabolism; D005260:Female; D020869:Gene Expression Profiling; D006540:Herbicides / Q000494:pharmacology; D006801:Humans; D017403:In Situ Hybridization; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D010052:Ovariectomy; D018384:Oxidative Stress; D010269:Paraquat / Q000494:pharmacology; D054465:Peroxiredoxin VI / Q000235:genetics / Q000378:metabolism*; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology; D011980:Receptors, Progesterone / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction / Q000502:physiology*; D022021:Tacrolimus Binding Proteins / Q000235:genetics / Q000378:metabolism*; D013997:Time Factors; D014599:Uterus / Q000187:drug effects / Q000378:metabolism*
D006540:Herbicides; D011980:Receptors, Progesterone; D011374:Progesterone; D054465:Peroxiredoxin VI; C515983:Prdx6 protein, mouse; D022021:Tacrolimus Binding Proteins; C403485:tacrolimus binding protein 4; D010269:Paraquat