Oxidative stress caused by a dysregulated Wnt/β-catenin signalling pathway is involved in abnormal placenta formation in pregnant mice with chronic fatigue syndrome. — CFSMEATLAS
Oxidative stress caused by a dysregulated Wnt/β-catenin signalling pathway is involved in abnormal placenta formation in pregnant mice with chronic fatigue syndrome.
Zhao, Hai, Zhang, Jian, Qian, Ning et al. · Zygote (Cambridge, England) · 2021 · DOI
Quick Summary
This study looked at how ME/CFS affects pregnancy in mice, focusing on how the placenta (which nourishes a developing baby) forms and functions. Researchers found that mice with CFS had more pregnancy complications, abnormal placentas, and increased cellular damage from oxidative stress (a harmful buildup of unstable molecules). The study suggests that two biological processes—oxidative stress and a disrupted cellular communication pathway called Wnt/β-catenin—may be responsible for these pregnancy problems.
Why It Matters
This research addresses an understudied but clinically significant area: reproductive health complications in ME/CFS patients, particularly pregnancy outcomes. Understanding the biological mechanisms—oxidative stress and pathway dysfunction—could eventually inform protective interventions for pregnant individuals with ME/CFS and provide insight into why the condition affects reproductive function more broadly.
Observed Findings
CFS in pregnant mice decreased the number of successful blastocyst implantation sites and increased fetal loss, including absorption, stillbirth, and malformation
Placental morphology and structure were abnormal in CFS-affected pregnant mice
Oxidative stress markers increased in serum, uterus, and placental tissue of CFS-affected pregnant mice, while antioxidant enzyme levels decreased
Wnt/β-catenin signaling pathway activity was suppressed in placentas from CFS-affected mice
Previous findings in this model showed CFS reduced progesterone levels, affected hypothalamic-pituitary-gonadal axis function, and caused congenital hypothyroidism in offspring
Inferred Conclusions
Oxidative stress and inhibition of the Wnt/β-catenin signaling pathway play important roles in abnormal placentation associated with CFS
CFS during pregnancy impairs multiple aspects of fetal development and placental function in this mouse model
The dysregulation of the Wnt/β-catenin pathway may be mechanistically linked to the increased oxidative stress observed in pregnancy with CFS
Remaining Questions
Do these placental abnormalities and oxidative stress mechanisms occur similarly in human pregnancies with ME/CFS?
What This Study Does Not Prove
This study does not establish that these findings occur in human ME/CFS pregnancies, as mouse models have important biological differences from humans. It demonstrates association and proposed mechanisms in an animal model but does not prove causation in humans, nor does it identify which interventions might prevent or reverse these placental abnormalities. The study also cannot determine whether these placental changes are the primary driver of pregnancy complications or a secondary effect.
Tags
Symptom:Fatigue
Biomarker:Gene ExpressionBlood Biomarker
Method Flag:PEM Not DefinedWeak Case DefinitionExploratory Only
Which specific triggers or molecular events initiate the Wnt/β-catenin pathway inhibition and oxidative stress in CFS pregnancy?
Can interventions targeting oxidative stress or restoring Wnt/β-catenin signaling prevent or reverse placental abnormalities and improve pregnancy outcomes in this model?
How do the observed placental changes relate to the previously documented hormonal and neurological effects of CFS in pregnant mice, and is there a common upstream cause?