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Dailynewsegypt > Blog > Science > New study links neuropsychiatric disorders to pollution
Science

New study links neuropsychiatric disorders to pollution

Daily News Egypt
Last updated: 2019/08/21 at 11:14 PM
By Daily News Egypt 4 Min Read
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Researchers are increasingly studying the effects of environmental insults on psychiatric and neurological conditions, motivated by emerging evidence from environmental events like the record-breaking smog that has choked New Delhi two years ago. 

In a new study published recently in the PLOS Biology journal, an international group of researchers from the US and Denmark used large data sets to suggest a possible link between exposure to environmental pollution and an increase in the prevalence of psychiatric disorders.

The team found that poor air quality was associated with higher rates of bipolar disorder and major depression in both US and Danish populations. The trend appeared even stronger in Denmark, where exposure to polluted air during the first ten years of a person’s life also predicted a more than two-fold increase in schizophrenia and personality disorders.

Computational biologist Atif Khan, the study’s first author, said the study shows that living in polluted areas, especially early in life, is predictive of mental disorders in both the US and Denmark. He added that “the physical environment – in particular air quality – warrants more research to better understand how our environment is contributing to neurological and psychiatric disorders.”

Although mental illnesses like schizophrenia develop due to a complex interplay of genetic predispositions and life experiences or exposures, genetics alone do not account entirely for variations in mental health and disease. Researchers have long suspected that genetic, neurochemical, and environmental factors interact at different levels to affect the onset, severity, and progression of these illnesses.

Growing evidence is beginning to provide insight into how components of air pollution can be toxic to the brain. Recent studies on rodents suggest that environmental agents like ambient small particulate matter (fine dust) travel to the brain through the nose and lungs, while animals exposed to pollution have also shown signs of cognitive impairment and depression-like behavioural symptoms. 

Andrey Rzhetsky, the lead author of the new study, said, “We hypothesised that pollutants might affect our brains through neuroinflammatory pathways that have also been shown to cause depression-like signs in animal studies.”

To quantify air pollution exposure among individuals in the US, the University of Chicago team relied on the US Environmental Protection Agency’s measurements of 87 air quality measurements. For individuals in Denmark, they used a national pollution register that tracked a smaller number of pollutants with much higher spatial resolution.

The researchers then examined two population data sets, the first being a US health insurance claims database that included 11 years of claims for 151 million individuals. The second dataset consisted of all 1.4 million individuals born in Denmark from 1979 through 2002 who were alive and residing in Denmark at their tenth birthday. 

Because Danes are assigned unique identification numbers that can link information from various national registries, the researchers were able to estimate exposure to air pollution at the individual level during the first 10 years of their life. In the US study, exposure measurements were limited to the county level. “We strived to provide validation of association results in independent large datasets,” said Rzhetsky.

Rzhetsky also cautioned that the significant associations between air pollution and psychiatric disorders discovered in the study do not necessarily mean causation, and said that further research is needed to assess whether any neuroinflammatory impacts of air pollution share common pathways with other stress-induced conditions.

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TAGGED: neuropsychiatric, New Delhi, pollution
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