News | Study Finds Direct Link Between Gut Microbiota and Ovarian Aging, With Unexpected Animal Results
A new study published in Nature Aging found that transplanting gut microbiota from older female mice significantly improved ovarian function and fertility in young mice. The finding provides the first experimental evidence that the gut microbiome may directly participate in ovarian aging.
Corresponding author Bérénice Benayoun, associate professor at the USC Leonard Davis School of Gerontology, said: “The results suggest bidirectional communication between the ovaries and the gut microbiota, and that this communication changes with age.”
Study Design: Reshaping the Microbiota
In the experiment, researchers first used antibiotics to remove the existing gut microbiota of young adult female mice. They then performed fecal microbiota transplantation to rebuild the microbiome “from scratch.” Donors were either young female mice or older female mice in “estropause,” a state similar to postmenopause in humans.
First author Min Hoo Kim, a postdoctoral researcher in the Benayoun laboratory, noted that the team initially expected the older microbiota to impair ovarian function, but the results were the exact opposite.
Molecular Signs of “Age Reversal”
In mice that received older microbiota, the transcriptomic profile of ovarian cells more closely resembled a younger state. Inflammatory markers in ovarian tissue also decreased significantly. Inflammation is widely considered an important biological hallmark of tissue aging.
Improvements were seen not only in the tissue but also in reproductive outcomes. Mice receiving older microbiota had a higher breeding success rate than those receiving young microbiota. The researchers said: “Some mice receiving young microbiota never produced offspring, while every mouse receiving older microbiota reproduced successfully.”
Possible Mechanism: Compensation by Estrogen-Related Microbiota
The research team proposed that the key may be the “estrobolome,” a group of gut microorganisms involved in estrogen metabolism. These microorganisms work with reproductive signals to maintain hormonal balance.
As the ovaries age, their response to microbial signals declines, and the relevant microbiota may compensate by increasing molecular signaling. When this “high-expression” microbiota is transplanted into a young ovarian environment that is more sensitive to the signals, it may produce an enhanced reproductive stimulus.
Potential Clinical Significance: A New Way to Delay Menopause?
The paper identified several bacterial species and metabolic pathways that may participate in “gut-ovary communication.” Although current evidence is limited to mouse models, this research provides a theoretical basis for reproductive anti-aging strategies based on microbiome modulation.
Benayoun emphasized that ovarian aging affects not only fertility but is also associated with increased risks of osteoporosis, cardiovascular disease, diabetes, and dementia. Earlier menopause is associated with a shorter lifespan.
She said: “Menopause does not simply mean the end of fertility; it has far-reaching effects on women’s overall health. If we can effectively delay menopause, we may help women live longer, healthier lives.”
The research team will next explore whether precisely modifying the microbiota could support women’s fertility and healthy aging.
News | Study Finds Direct Link Between Gut Microbiota and Ovarian Aging, With Unexpected Animal Results
News | Study Finds Direct Link Between Gut Microbiota and Ovarian Aging, With Unexpected Animal Results
A new study published in Nature Aging found that transplanting gut microbiota from older female mice significantly improved ovarian function and fertility in young mice. The finding provides the first experimental evidence that the gut microbiome may directly participate in ovarian aging.
Corresponding author Bérénice Benayoun, associate professor at the USC Leonard Davis School of Gerontology, said: “The results suggest bidirectional communication between the ovaries and the gut microbiota, and that this communication changes with age.”
Study Design: Reshaping the Microbiota
In the experiment, researchers first used antibiotics to remove the existing gut microbiota of young adult female mice. They then performed fecal microbiota transplantation to rebuild the microbiome “from scratch.” Donors were either young female mice or older female mice in “estropause,” a state similar to postmenopause in humans.
First author Min Hoo Kim, a postdoctoral researcher in the Benayoun laboratory, noted that the team initially expected the older microbiota to impair ovarian function, but the results were the exact opposite.
Molecular Signs of “Age Reversal”
In mice that received older microbiota, the transcriptomic profile of ovarian cells more closely resembled a younger state. Inflammatory markers in ovarian tissue also decreased significantly. Inflammation is widely considered an important biological hallmark of tissue aging.
Improvements were seen not only in the tissue but also in reproductive outcomes. Mice receiving older microbiota had a higher breeding success rate than those receiving young microbiota. The researchers said: “Some mice receiving young microbiota never produced offspring, while every mouse receiving older microbiota reproduced successfully.”
Possible Mechanism: Compensation by Estrogen-Related Microbiota
The research team proposed that the key may be the “estrobolome,” a group of gut microorganisms involved in estrogen metabolism. These microorganisms work with reproductive signals to maintain hormonal balance.
As the ovaries age, their response to microbial signals declines, and the relevant microbiota may compensate by increasing molecular signaling. When this “high-expression” microbiota is transplanted into a young ovarian environment that is more sensitive to the signals, it may produce an enhanced reproductive stimulus.
Potential Clinical Significance: A New Way to Delay Menopause?
The paper identified several bacterial species and metabolic pathways that may participate in “gut-ovary communication.” Although current evidence is limited to mouse models, this research provides a theoretical basis for reproductive anti-aging strategies based on microbiome modulation.
Benayoun emphasized that ovarian aging affects not only fertility but is also associated with increased risks of osteoporosis, cardiovascular disease, diabetes, and dementia. Earlier menopause is associated with a shorter lifespan.
She said: “Menopause does not simply mean the end of fertility; it has far-reaching effects on women’s overall health. If we can effectively delay menopause, we may help women live longer, healthier lives.”
The research team will next explore whether precisely modifying the microbiota could support women’s fertility and healthy aging.
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