A study published in Molecular Human Reproduction has found that fetal cells can migrate into a mother’s body during pregnancy and remain there for years, a phenomenon known as Microchimerism.
Researchers at Leiden University Medical Center examined tissue samples from recently pregnant women and detected cells containing a Y chromosome, originating from male fetuses, in 100% of the samples.
The findings suggest that fetal microchimerism may be more common than previously thought.
Experts say these fetal-derived cells can evade the mother’s immune system, possibly by modulating immune responses, allowing them to persist undetected.
Some studies indicate that these cells may even integrate into maternal organs and function like normal cells.
For example, fetal cells found in the heart may develop into cardiac cells and contribute to tissue repair.
Scientists also believe these cells could play a role in healing damaged tissues due to their regenerative properties. However, the broader health implications remain unclear.
Research shows mixed evidence regarding whether fetal microchimerism protects against diseases or contributes to them.
Some studies link it to autoimmune conditions such as Graves’ disease and Hashimoto’s thyroiditis, which are more common in women.
There may also be a connection to cancer. While lower levels of fetal cells have been observed in women with breast cancer, higher concentrations have been found within tumors, raising questions about whether these cells help fight or promote cancer.
Researchers emphasize that more studies are needed to fully understand the long-term impact of fetal microchimerism on women’s health.
