Study links perinatal nicotine exposure to long-term immune system changes in mice

A recent study led by the University of California, Santa Cruz, has found that exposure to nicotine during pregnancy and the early postnatal period results in persistent, long-term changes to the hematopoietic stem cells and the immune system of mice.

Researchers observed that offspring exposed to nicotine possessed a reduced number of hematopoietic stem cells, which are responsible for producing the mature immune cells needed to combat external threats. Furthermore, the study identified altered patterns of gene expression within these cells that regulate immune responses. These physiological shifts persisted into the adult life of the subjects, even after the initial exposure had ceased.

When the nicotine-exposed mice were later challenged with the influenza virus, they exhibited a significantly more intense inflammatory response compared to control groups. These findings highlight the potential for perinatal nicotine exposure to create a lasting negative impact on the development of the immune system and the body's future ability to react to viral infections.