Female gut muscles reshape to meet the demands of reproduction, preclinical study suggests
Organs don't just grow in early life; they can change in response to physiological or environmental challenges in adulthood. Researchers have now identified an active role for the intestinal muscles in remodeling the gut after reproduction.
In a recent study, scientists have discovered that the muscles lining the female gut undergo significant changes in response to reproduction, as detailed in a preclinical research published in the journal Cell. These findings, led by developmental biologist Irene Miguel-Aliaga, reveal that these muscle cells adapt their size and function to support the energy demands of reproduction, such as egg production in fruit flies or lactation in mice.
The researchers found that female fruit fly and mouse intestines grow after reproduction, a change that is necessary for sustaining offspring by increasing nutrient intake. This growth is not just a passive mechanical response, but an active process where the muscles become longer and less contractile, allowing for more efficient nutrient absorption.
The study identified that this change is driven by the hormone Juvenile Hormone (JH), which normally restrains muscle growth but is reduced in quantity after reproduction, allowing the muscles to grow. This discovery suggests that intestinal muscles play a crucial role in adapting to the physiological changes associated with reproduction, acting as gatekeepers that can adjust the gut's size and function in response to various challenges, including changes in nutrition or the immune system.
The researchers are now exploring whether these patterns of organ change also occur in humans, potentially leading to new ways of addressing energy balance issues such as weight retention after childbirth.
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