Oxidative Stress and the Induction of Cyclooxygenase Enzymes and Apoptosis in the Murine Placenta
Open accessAbstract
Placental oxidative stress has been implicated in many complications of human pregnancy, including preterm delivery and preeclampsia. It is now appreciated that reactive oxygen species can induce a spectrum of changes, ranging from homeostatic induction of enzymes to apoptotic cell death. Little is known regarding the occurrence of placental oxidative stress in other species. We investigated markers of oxidative stress in the labyrinthine (LZ) and junctional (JZ) zones of the murine placenta across gestational age, and correlated these with expression of the cyclooxygenase enzymes COX-1 and COX-2, and apoptosis. We tested a causal link between the two by subjecting placental explants to hypoxia-reoxygenation (H/R) in vitro, a known stimulus for generation of oxidative stress. Western blotting demonstrated significant increases in the concentrations of hydroxynonenal (HNE), COX-1 and COX-2 with gestational age. Dual-labelling demonstrated co-localisation of HNE, and COX-1 and COX-2 within the trophoblast of the LZ, and glycogen cells of the JZ. An apoptotic index based on TUNEL-positivity demonstrated an increase with gestational age, and dual-labelling showed co-localisation of TUNEL labelling with HNE and active caspase-3 within the trophoblast of the LZ. H/R significantly increased oxidative stress, induction of COX-1 and COX-2, and the apoptotic index. Co-localisation demonstrated the increases in COX to be within the trophoblast of the LZ, and in particular the glycogen cells of the JZ. Apoptosis was restricted to the LZ. We speculate that the induction of COX enzymes is a physiological response to oxidative stress, and may play a role in initiating or augmenting parturition. Generation of oxidative stress may also play a role in influencing the growth trajectory of the placenta, and its component cell types. The mouse may provide an experimental genetic model in which to investigate these phenomena.
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The prolonged gestation interval observed in the ERKdko females was reminiscent of phenotype described for the cyclooxygenase 1 (PGHS1/COX1) knockout animal.
“First, the prolonged gestation interval observed in the ERKdko females was reminiscent of phenotype described for the cyclooxygenase 1 (PGHS1/COX1) knockout animal34–39.”
From Conditional loss of ERK1 and ERK2 results in abnormal placentation and delayed parturition in the mouse (2019) · cites this paper as [38]
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“In the murine placenta, apoptotic cells and the expression of caspase-3 (CASP3), one of the key executioners of apoptosis, showed temporal and spatial associations [7, 8].”
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“For example, murine placenta, which experience oxidative stress during gestation, exhibited higher expression of COX-1 and COX-2 [45]. mPGES-1 is a perinuclear protein that is markedly induced by cytokines and growth factors as in the case of COX-2 [43].”
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α-Solanine Causes Cellular Dysfunction of Human Trophoblast Cells via Apoptosis and Autophagy
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“Malfunctioning of trophoblasts leads to inflammation [25], oxidative stress [26,27], apoptosis [28,29], and dysregulated angiogenesis [30].”
BackgroundThe Role of Autophagy in the Female Reproduction System: For Beginners to Experts in This Field
Nakashima, A., Furuta, A., Yamada, K., Yoshida‐Kawaguchi, M., Yamaki‐Ushijima, A., Yasuda, I., Ito, M., Yamashita, S., Tsuda, S., Yoneda, S., et al. (2023) · Biology · doi:10.3390/biology12030373 · Cited by 14 · see citing works
“The hypoxia-reoxygenation (H/R) model is well used for in vitro preeclamptic placental models because H/R poses ER and oxidative stress in trophoblasts [82,83].”
MethodMaternal diabetes impairs oxidative and inflammatory response in murine placenta
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“Trophoblasts also experienced oxidative stress in rats and mice [95, 96].”
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Stereological study of the placental structure in abortion-prone mice model (CBA/J×DBA/2J)
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“Hypoxia-reoxygenation resulting in oxidative stress has been shown to be associated with the formation of hydroxynonenal, a marker of lipid peroxidation, in the mouse placenta on embryonic day 16 and thereafter but not on embryonic day 14 (Burdon et al., 2007).”
BackgroundInfluentialHepatotoxicity effect of short-term Bradykinin potentiating factor in cholestatic rats
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“In a mouse model, oxidative stress increased close to term and the authors proposed that this played a physiologic role by increasing prostaglandin synthesis, some of which helped to induce parturition [25].”
BackgroundSignificance of the endothelium in the development of gestational complications
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Paraoxonase 2 Protein Is Spatially Expressed in the Human Placenta and Selectively Reduced in Labour
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“In vitro studies also suggest that hypoxiareoxygenation increases COX-2 which may in turn play a role in augmentation or even initiation of labour [26].”
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“[9] Placental dysfunction is the central characteristic of all three of these complications of human pregnancy.[10-14] Any deviation in the placental morphology indicates fetal compromise during intrauterine life.”
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“Interestingly, the high expression of the oxidative stress marker proteins COX2 [34] and glutathione peroxidyl/transferase in the MF group, again suggesting a strong oxidative stress state in the skin of MF lambs (Fig.”
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“Therefore, drugs that have the ability to scavenge free radicals may play an important role in alleviating inflammation and could protect lipids and chromatin from oxidation [16,30,31,89,90].”
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Metabolomic Analysis of Serum and Placenta in PreeclampsiaPreprint
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“The induction of the COX enzymes has been reported closely related to excessive oxidative stress in rat cytotrophoblast, spongiotrophoblast and glycogen cells and might be regulated through activation of the p38MAPK and the NF-κB transcription factor [44].”
BackgroundPlacental transport and metabolism
Dicke, J. M. (2021) · CRC Press eBooks · doi:10.1201/9781003222590-63
“In vitro studies using murine placenta subjected to oxidative stress through a process of hypoxia/ reoxygenation have demonstrated significant increases in the concentrations of cyclooxygenase, enzymes that stimulates PG production (22).”
PREECLAMPSIAAND STERILE INFLAMMATORY MOLECULES
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The Clocks of Motivation: Rhythms of Molecular Restraints Originate Intentional Behaviors
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Glutathione depletion activates cGAS-STING signaling via oxidative stress in preeclampsia
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- Authors
- Burdon, C., Mann, C., Cindrova-Davies, T., Ferguson-Smith, A. C., & Burton, G. J.
- Affiliations
- University of Cambridge (GB)
- Corresponding author
- Burton, G.J.
- Venue
- Placenta
- Publisher
- Elsevier BV
- Published
- 2007-07
- Volume
- 28
- Issue
- 7
- Pages
- 724-733
- ISSN
- 0143-4004 (ISSN-L)
- PMC
- PMC1895600
- OpenAlex
- W2013955956
- Cited by
- 71
- References
- 41
- Citations by year
- 2026: 3 · 2025: 1 · 2024: 4 · 2023: 6 · 2022: 1 · 2021: 6 · 2020: 6 · 2019: 6 · 2018: 3 · 2017: 4 · 2016: 6 · 2015: 3 · 2014: 3 · 2013: 1 · 2012: 4
- FWCI
- 5.06
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Placenta (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Funders
- Wellcome Trust (069027)
- Topics
- Health Sciences › Medicine › Obstetrics and Gynecology › Pregnancy and preeclampsia studies
- Life Sciences › Immunology and Microbiology › Immunology › Reproductive System and Pregnancy
- Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
- Keywords
- placental oxidative stress, cyclooxygenase-1, cyclooxygenase-2, apoptosis, hypoxia/reoxygenation, 4-hydroxynonenal, trophoblast, glycogen cells, labyrinth zone, junctional zone, caspase-3, TUNEL, childbirth, placental development
- MeSH terms
- Aldehydes, Animals, Female, Mice, Inbred C57BL, Placenta, Pregnancy, Blotting, Western, Biomarkers, Up-Regulation, Apoptosis, Oxidative Stress, Mice, Cyclooxygenase 1, Cyclooxygenase 2, Caspase 3
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