Researchers at the University of California Riverside found that nanomolar concentrations of vanillin cause stem cells to lose pluripotency and prematurely differentiate into endoderm tissue, a mechanism that may help explain clinical links between vaping, difficulty conceiving, and miscarriages.
How Vanillin Targets Embryonic Stem Cells
Laboratory tests conducted on human embryonic stem cells—which are similar to those in human embryos at three weeks old—reveal that vanillin triggers cellular changes through a specific biological pathway.
In normal development, the embryonic stem cells would form three cell types: endoderm, ectoderm and mesoderm.
"Our data predict that nanomolar concentrations of vanillin may reach the embryo in pregnant women who vape," Prof. Talbot said. In embryos lacking ectoderm, the nervous system would fail to develop. In embryos lacking mesoderm, many tissues, such as muscle, would fail to develop. Micromolar concentrations tended to kill the cells.
Did You Know?
Embryonic stem cells have the potential to differentiate into any type of cell. In normal embryonic development, they form three cell types: endoderm, ectoderm and mesoderm. Exposure to vanillin disrupts this, causing stem cells to lose pluripotency and differentiate into endoderm, rather than ectoderm or mesoderm.
Implications for Pregnancy and Vaping Regulation
Because as it is practically impossible and also unethical to study the effect of chemicals on pregnant women and their developing embryos, the research team instead investigated human embryonic stem cells in a series of tests in the laboratory.
Furthermore, the study does not predict the effect of cumulative exposure to vanillin over days, weeks, months or years. The effect of long-term exposure could be higher.
The researchers suggest that regulatory policies are generally based on data derived from adults or adult cells. However, the prenatal stages of development are usually the most sensitive to environmental chemicals. Regulatory agencies should consider mandatory ingredient disclosure on packaging for e-cigarettes.
Pro Tip:
If you are planning a pregnancy or experiencing fertility challenges, consult a healthcare provider regarding all environmental exposures, including the chemical constituents found in flavored e-cigarettes and aerosol products.
Frequently Asked Questions
What is vanillin’s effect on embryonic stem cells?
According to research published in Human Reproduction, nanomolar concentrations of vanillin cause cells to lose pluripotency and differentiate into endoderm, rather than ectoderm or mesoderm.
Can these laboratory findings be definitively applied to pregnant women?
How does vanillin enter the cellular pathway?
What do researchers recommend for regulatory policy?
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