Fetal hypoxia in mice reduced oocyte quality and litter size; NMN partly restored pup numbers
In a mouse model kept in a high-plateau hypoxic setting from embryonic day 0 to 16.5, fetal hypoxia was linked to fewer pups per litter, oocyte mitochondrial dysfunction, oxidative stress and Sirt3/Sod2 downregulation; nicotinamide mononucleotide (NMN) administration was reported to alleviate these oocyte impairments. [1]
Automatic summary · not editorially reviewed
The key findings
Fetal mice kept in a high-plateau hypoxic setting from embryonic day 0 to 16.5 had 57.7% fewer pups per litter than controls. [1]
Fetal hypoxic stress was linked to early apoptosis and DNA damage from mitochondrial dysfunction, oxidative stress and Sirt3/Sod2 downregulation. [1]
NMN intervention restored pups per litter to 73.1% of the control group in this mouse model. [1]
The source at a glance
- Study type / format
- Animal study (mouse fetal hypoxia model), reported in an abstract
- Population / context
- Fetal mice exposed to a high-plateau hypoxic setting from embryonic day 0 to 16.5, compared with a control group.
- Summary based on
- Study abstract
- Original publication
- September 1, 2026
Fetal hypoxia mouse model and litter size
The abstract describes a fetal hypoxia model in which fetal mice were kept in a high-plateau hypoxic setting from embryonic day 0 to 16.5. These fetal hypoxia mice showed a significant reduction in the average number of pups per litter, reported as 57.7% lower than in the control group. The authors note that effects of fetal hypoxia on the female reproductive system, especially oocyte maturation, were previously poorly understood.
Supporting source [1]
Oocyte stress, mitochondrial dysfunction and NMN in mice
According to the abstract, fetal hypoxic stress was associated with lower cleavage and blastocyst rates and with early apoptosis and DNA damage, triggered by mitochondrial dysfunction, aggravated oxidative stress and downregulation of Sirt3/Sod2. Administration of nicotinamide mononucleotide (NMN) was reported to prevent oocyte mitochondrial dysfunction and developmental impairment by increasing Sirt3/Sod2 expression and autophagy. NMN intervention restored pups per litter to 73.1% of the control group.
Supporting source [1]
Abstract-only mouse findings and clinical outlook
The authors conclude that fetal hypoxia exposure may cause multiple damages to adult female reproduction in this mouse model and highlight the clinical potential of NMN supplementation as a targeted intervention for such hypoxia-associated impairment. These are findings from a mouse study reported in an abstract; they do not establish benefit for human reproduction or lifespan, and the full text was not reviewed.
Supporting source [1]
How to interpret this
Abstract only; the full text was not reviewed. Findings come from a mouse fetal hypoxia model, so they do not establish human reproductive or lifespan benefits, and NMN effects are described as potential.
Based on the study abstract; the full paper, tables and supplementary data were not reviewed.
Source & supporting passages
Zhang LY, Liu KX, Zhang K, Qin X, Luo YW, Zhuan QR, Hou J, Yang QE, Hou YP. · europepmc.org · September 1, 2026