Study wrapper · #744
MOTS‑c protects against placental injury via Nrf2 activation in hypoxia‑induced intrauterine growth restriction mice.
Editor's note
In a mouse model of hypoxia-induced intrauterine growth restriction, researchers found placental MOTS-c was reduced and correlated with lower fetal weight, and that giving MOTS-c attenuated growth restriction by promoting placental angiogenesis and reducing oxidative-stress-driven placental dysfunction. The mechanism was Nrf2-dependent: MOTS-c lost its effect in Nrf2-knockout mice and in cells treated with an Nrf2 inhibitor, a strong causal check. This remains a single-model preclinical study; these are preclinical findings, and human data are needed before any clinical conclusions can be drawn. It is consistent with the recurring MOTS-c theme of Nrf2-linked antioxidant protection in tissue under oxidative stress, here extended to placental biology, but it carries no implications for human pregnancy at this stage.
Plain-language abstract
Intrauterine growth restriction, when a baby grows too slowly in the womb, is often driven by oxidative stress in the placenta. Researchers modelled this in pregnant mice by exposing them to low oxygen, and studied MOTS-c, a mitochondria-derived peptide. They found the placenta had less MOTS-c, and lower levels went with lower fetal weight. Giving MOTS-c reduced the growth restriction by helping the placenta grow blood vessels and by cutting oxidative damage. They showed the benefit depended on a protective protein called Nrf2: in mice lacking Nrf2, or in cells where Nrf2 was blocked, MOTS-c no longer worked, which supports the proposed mechanism. Because this was done only in mice and cells, it cannot tell us anything about human pregnancy, and human studies would be needed before drawing conclusions. The work adds to evidence that MOTS-c protects tissues from oxidative stress through the Nrf2 antioxidant pathway.