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Scientists are studying how nanoparticles, which are omnipresent in our environment and suspected of causing developmental issues in unborn children, interact with the placental barrier. Their research has revealed that these particles can disrupt the communication between the placenta and the fetus, particularly affecting blood vessel formation without necessarily being present in the fetal tissue.
Researchers are investigating how nanoparticles from various products and environmental sources affect embryonic development by disrupting placental function and indirectly harming fetal tissue, despite the protective placental barrier.
Human life begins with a single egg cell that grows into a human being with trillions of cells. To ensure that the highly complex development of tissues and organs is as protected as possible, the placental barrier keeps pathogens and foreign substances out. Tina Bürki and her team from Empa’s Particles-Biology Interactions laboratory in St. Gallen are investigating how this protective mechanism copes with nanoparticles.
Nanoparticles are contained in a large number of products, but they are also produced during wear and tear as well as through combustion processes. “We absorb these substances from the environment via our food, cosmetics, or the air we breathe,” explains Bürki. Some of these nanoparticles are suspected of harming babies in the womb. Low birth weight, autism, and respiratory diseases are among the possible consequences for the child.
Empa-Researcher Tina Bürki. Credit: Empa
Mysterious remote effect
It is still unclear how the nanoparticles affect the unborn child. “We already know that the placental barrier retains many nanoparticles or at least delays their transport to the embryo,” says Bürki. However, damage to the fetal tissue occurs, even if no particles have been detected in the fetus. The Empa team is now getting to the bottom of this long-range effect of nanoparticles. Together with clinical partners from the Cantonal Hospital of St. Gallen and research partners from the University of Geneva, the Amsterdam University Medical Center, and the Leibniz Institute for Environmental Medical Research in Düsseldorf, the team is investigating the consequences of common nanoparticles such as titanium dioxide or diesel soot on the function of the placenta and their indirect damage to embryonic development.
For this purpose, the team used fully functional human placentas that were made available after planned cesarean sections. “Human placental tissue is the only way to obtain meaningful results on the transport and effect of nanoparticles,” says the Empa researcher. “The structure, metabolism, and interaction of maternal and fetal tissue are unique and 
If nanoparticles enter the placenta during pregnancy, the formation of blood vessels is suppressed. Fluorescence microscopy visualizes the consequences in the chicken egg model: The veins (green) only form a perforated, coarse-meshed network when they are treated with messenger substances from a nanoparticle-contaminated placenta (bottom). In comparison, a control chicken egg (top) displays a dense network of very fine blood vessels. Credit: Empa
The experiments showed that nanoparticles in placental tissue disrupt the production of a large number of messenger substances. And it is these messengers that can trigger serious changes in embryonic development, such as disturbed blood vessel formation.
These effects can be visualized in laboratory models using chicken eggs. The blood vessels in the egg actually grow at an enormous speed and density to enable embryonic development. A dense network of fine blood vessels covers the inside of the eggshell. The situation is strikingly different in eggs treated with the altered messenger substances from the nanoparticle-treated placenta: In the experiments, the blood vessel system was not as dense but rather coarse-meshed. “Nanoparticles apparently have an indirect effect on the child in the womb by inhibiting the formation of blood vessels via messenger substances,” says Tina Bürki.
Health consequences
The researchers are currently investigating the entirety of the messenger substances released by a nanoparticle-treated placenta, the so-called secretome. Uncontaminated, the interplay of hormones, inflammatory mediators, and signaling substances for the formation of organ systems resembles a perfectly tuned orchestra. It is already clear that the communication between the placenta and the unborn child is disrupted by the presence of nanoparticles and damages the formation of blood vessels. However, initial results show that the development of the nervous system does not appear to be affected. Future analyses will show what other disorders the nanoparticles can trigger indirectly. “As the effects can have an impact on the health of the pregnant woman and the development of her child, these findings should be taken into account in the risk assessment of nanomaterials,” says the researcher.
The clinical partner, the Cantonal Hospital of St. Gallen, is also interested. As Thomas Rduch from the Women’s Clinic and also a Clinical Research Fellow at Empa puts it: “A healthy placenta is of utmost importance for the development of the child. Correct risk assessments of environmental pollution are therefore crucial for pregnant women.”
Reference: “Nanoparticles Dysregulate the Human Placental Secretome with Consequences on Angiogenesis and Vascularization” by Battuja Dugershaw-Kurzer, Jonas Bossart, Marija Buljan, Yvette Hannig, Sarah Zehnder, Govind Gupta, Vera M. Kissling, Patrycja Nowak-Sliwinska, Judy R. van Beijnum, Arjan W. Griffioen, Stefan Masjosthusmann, Etta Zühr, Ellen Fritsche, René Hornung, Thomas Rduch and Tina Buerki-Thurnherr, 20 May 2024, Advanced Science.
DOI: 10.1002/advs.202401060
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