Summary: A new mouse study reveals the impact of air pollution on male fertility. Researchers report air pollution reduces sperm count in mice by inducing inflammation in specific brain areas.
Source: University of Maryland
Researchers have long known that air pollution can increase the risk of disorders such as obesity, diabetes, and fertility, but they did not know the exact mechanism for how it can lead to these health conditions.
Now, University of Maryland School of Medicine (UMSOM) researchers have shown how air pollution reduces sperm count in mice by causing inflammation in the brain.
Scientists already know that the brain has a direct line to the reproductive organs affecting fertility and sperm count under stressful conditions. For example, emotional stress can lead to skipped menstrual periods in women. However, this latest study, published on Sept. 8 in Environmental Health Perspectives, connects the dots on how breathing polluted air can lower fertility.
“Our findings showed that the damage due to air pollution—at least to the sperm count—could be remedied by removing a single inflammation marker in the brains of mice, suggesting that we may be able to develop therapies that could prevent or reverse the damaging effects of air pollution on fertility,” said lead study author Zhekang Ying, PhD, Assistant Professor of Medicine at UMSOM.
Charles Hong, MD, PhD, the Melvin Sharoky, MD Professor in Medicine and Director of Cardiology Research at UMSOM said, “These findings have wider implications than just fertility, as there are many conditions, such as high blood pressure, diabetes, and heart disease that can result from brain inflammation due to air pollution.”
About 92 percent of the world population lives in areas where the level of fine particles in the air smaller than 2.5 micrometers in diameter exceed the minimum safety standards set by the World Health Organization. These particles can come from sources such as car exhaust, factory emissions, wildfires, and woodburning stoves.
In past studies, some results have shown that mice exposed to air pollution did not always have inflammation of the testes —the male sex organs that make sperm — meaning that some other mechanism was potentially responsible for reduced sperm counts. Knowing the direct link between the brain and the sex organs, the researchers tested whether air pollution increased inflammation in the brain.
For this new study, researchers tested healthy mice and mice bred to lack a marker of inflammation in the brain, called Inhibitor KappaB Kinase 2, or IKK2 for short, specifically located in the brain’s neurons. They exposed both healthy and IKK2 mutant mice to filtered air or air pollution and then tested their sperm counts. The mice bred without the IKK2 inflammation marker in their neurons did not have reductions in their sperm counts when exposed to the polluted air, unlike the healthy mice.
Researchers then removed IKK2 from specific neurons to determine more precisely how air pollution was leading to lower sperm counts. They found that one specific kind of neuron typically associated with sleep cycle and obesity was responsible for the reduced sperm count due to air pollution. These neurons typically are found in the hypothalamus, a part of the brain which controls hunger, thirst, and sex drive. The hypothalamus also works with the brain’s pituitary gland, which makes hormones that communicate directly with reproductive organs.
“Looking back, it makes perfect sense that the neurons in the hypothalamus are the culprits perpetuating this inflammation response that results in low sperm count, as we know that the hypothalamus is a major pathway link between the brain and the reproductive system,” said Dr. Ying.
E. Albert Reece, MD, PhD, MBA, Executive Vice President for Medical Affairs, UM Baltimore, and the John Z. and Akiko K. Bowers Distinguished Professor and Dean at UMSOM commented, “Environmental pollution is a problem of equity in that some persons who are poor or of color tend to face more severe health-related conditions due to greater exposure. It is important to explore the mechanisms by which pollution affects the body, so we can devise ways to prevent or treat these conditions to eliminate these health disparities.”
Funding: The study was funded by the National Institute of Environmental Health Sciences (R01ES024516, R01ES032290), the American Heart Association (13SDG17070131), National Natural Science Foundation of China (81302452), Major Projects of Natural Sciences of University in Jiangsu Province of China (18KJB330004), a project fund of Basic Scientific Research program of Nantong City (JC2019021), and Nantong University.
The researchers have no conflicts to report.
About this pollution and neurobiology research news
PM2.5 Exposure of Mice during Spermatogenesis: A Role of Inhibitor κB Kinase 2 in Pro-Opiomelanocortin Neurons
Epidemiological studies have shown that exposure to ambient fine particulate matter with aerodynamic diameter less than or equal to 2.5 μm (PM2.5PM2.5) correlates with a decrease in sperm count, but the biological mechanism remains elusive.
This study tested whether hypothalamic inflammation, an emerging pathophysiological mediator, mediates the development of lower epididymal sperm count due to PM2.5PM2.5 exposure.
Inhibitor κBκB kinase 2 (IKK2) was conditionally knocked out either in all neurons or subtypes of hypothalamic neurons of mice. Effects of concentrated ambient PM2.5PM2.5 (CAP) exposure on hypothalamic inflammation, the hypothalamic–pituitary–gonadal (HPG) axis, and epididymal sperm count of these mouse models were then assessed. Furthermore, to test whether hypothalamic inflammation is sufficient to decrease sperm production, we overexpressed constitutively active IKK2 (IKK2ca) either in all neurons or subtypes of hypothalamic neurons and assessed hypothalamic inflammation, the HPG axis, and sperm production of these overexpression mouse models.
CAP-exposed wild-type control mice vs. filtered air (FA)-exposed wild-type control mice had a higher expression of hypothalamic inflammatory markers, lower functional indexes of the HPG axis, and a lower epididymal sperm count. In contrast, all these measurements for CAP- vs. FA-exposed mice deficient of IKK2 in all neurons were comparable. We also found that overexpression of IKK2ca in either all neurons or pro-opiomelanocortin (POMC) neurons only, but not in Agouti-related protein (AgRP) neurons only, resulted in lower functional indexes of the HPG axis and a lower epididymal sperm count. Moreover, we showed that CAP- vs. FA-exposed mice deficient of IKK2 in POMC neurons had a comparable expression of hypothalamic inflammatory markers, comparable functional indexes of the HPG axis, and a comparable epididymal sperm count.
This mouse model study shows a causal role of IKK2 of POMC neurons in the development of lower epididymal sperm count due to PM2.5PM2.5 exposure, providing a mechanistic insight into this emerging pathogenesis.