{"id":4344,"date":"2021-10-07T14:21:10","date_gmt":"2021-10-07T21:21:10","guid":{"rendered":"https:\/\/keck.usc.edu\/news\/usc-studies-show-that-clean-air-matters-for-a-healthy-brain\/"},"modified":"2023-11-19T12:49:07","modified_gmt":"2023-11-19T20:49:07","slug":"usc-studies-show-that-clean-air-matters-for-a-healthy-brain","status":"publish","type":"post","link":"https:\/\/keck.usc.edu\/news\/usc-studies-show-that-clean-air-matters-for-a-healthy-brain\/","title":{"rendered":"USC studies show that clean air matters for a healthy brain"},"content":{"rendered":"\n \n \n\n\n\n\n\n\n\n
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USC studies show that clean air matters for a healthy brain<\/h1>\n\n\n<\/div>\n \n \n
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Researchers say their studies on air pollution and cognitive decline \u2014 one involving humans and one with mice \u2014 provide evidence that cleaner air may reduce risk for Alzheimer\u2019s and other dementias.<\/p>\n\n\n\n<\/div>\n \n

\n Jenesse Miller<\/span>\n \n October 07, 2021<\/span>\n <\/div>\n \n \n
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Cars and factories produce PM2.5, which researchers have linked to linked to memory loss and Alzheimer\u2019s disease. (Image\/Ralf Vetterle from Pixabay)<\/figcaption>\n <\/figure>\n \n \n \n\n<\/div>\n \n\n <\/div><\/div>\n\r\n\r\n\n\n \n \n\n\n\n\n\n\n\n
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(Originally posted at USC News<\/a>.)<\/p>\n

Two USC researchers whose work linked air pollution to a greater risk of Alzheimer\u2019s disease and faster cognitive decline are seeing signs that cleaner air can make a difference in brain health.<\/p>\n

Cars and factories produce a fine particulate known as PM2.5 that USC-led studies have linked to memory loss and Alzheimer\u2019s disease. Smaller than the width of a human hair, these tiny particles pose a big problem. Once inhaled, they pass directly from the nose up and into the brain, beyond the blood-brain barrier that normally protects the brain from dust or other invaders.<\/p>\n

In a research letter published today in\u00a0Alzheimer\u2019s & Dementia: The Journal of the Alzheimer\u2019s Association<\/a>, the USC researchers described how their labs each independently reported indications of recent decreases in neurotoxicity (damage to the brain or nervous system caused by exposure to toxic substances) of PM2.5 air pollution in humans and mice.<\/p>\n

University Professor\u00a0Caleb Finch<\/a>\u00a0and Associate Professor\u00a0Jennifer Ailshire<\/a>, both with the USC Leonard Davis School of Gerontology, focused on PM2.5 pollution. The small particulate is absorbed both by our lungs and blood. Long-term exposure to PM2.5 has been linked to premature death, particularly in people with chronic heart or lung diseases.<\/p>\n

Declines in brain health associated with unclean air in people with less education<\/strong><\/p>\n

Ailshire\u2019s research, published earlier this year in the\u00a0Journal of Alzheimer\u2019s Disease<\/a>, showed a strong association between cognitive deficits and air pollution among people with lower levels of education in 2004.<\/p>\n

Based on data from the nationwide Health and Retirement Study, her work showed that, when exposed to PM2.5s, adults 65 and older who had fewer than 8 years of education faced a greater risk of cognitive impairment. But one decade later, Ailshire found no such association for study participants.<\/p>\n

A likely factor was the reduction in PM2.5 over the prior decade, said Ailshire, an associate professor of gerontology and sociology. Air quality data showed the average annual PM2.5 levels in the study participants\u2019 neighborhoods were 25% below 2004 levels.<\/p>\n

Notably in 2014, very few of the study participants lived in places with annual average PM2.5 that exceeded U.S. Environmental Protection Agency air quality standards. This further suggested that the improvements with cognitive decline were linked to a drop in exposure to high pollution among older adults.<\/p>\n

\u201cImproving air quality around the country has been a tremendous public health and environment policy success story. But there are signs of a reversal in these trends,\u201d Ailshire said. \u201cPollution levels are creeping up again and there are increasingly more large fires, which generate a significant amount of air pollution in certain parts of the country. This gives me cause for concern about future trends in improving air quality.\u201d<\/p>\n

Improving air quality may have cognitive benefits<\/strong><\/p>\n

Finch\u2019s research on mice, published earlier this year in the\u00a0Journal of Alzheimer\u2019s Disease<\/a>, also found evidence of lower neurotoxicity of air pollution over time.<\/p>\n

Finch and his research team have studied pollution levels at the same Los Angeles site and their effect on mouse brains since 2009. After 2017, the mice exposed to a tiny, nanoscale version of PM2.5 appeared healthier. Markedly, they showed sharp declines in several factors of neurotoxicity, including oxidative damage to cells and tissues.<\/p>\n

During the years that Finch\u2019s and Ailshire\u2019s studies were taking place, the composition of air pollution in the United States was also changing.<\/p>\n

From 2000 to 2020, the PM2.5 levels declined nationwide by 41% according to the EPA. In contrast, urban PM2.5 in Los Angeles declined only slightly from 2009 to 2019. While nationwide ozone levels decreased, Los Angeles County ozone reversed the prior trends by increasing after 2015.<\/p>\n

Finch and Ailshire emphasize that their findings cannot evaluate the potential benefits of air pollution improvements to the risk of cognitive decline and dementia. Although PM2.5 levels declined nationally from 2009 to 2016, the year-over-year increases that have been observed since 2017 show that improvements in air quality can be reversed, as they were in Los Angeles.<\/p>\n

\u201cOur findings underscore the importance of efforts to improve air quality as well as the continued importance of demographic and experimental evaluation of air pollution neurotoxicity,\u201d said Finch.<\/p>\n

Finch and\u00a0Jiu-Chiuan \u201cJ.C.\u201d Chen<\/a>, an associate professor of population and public health sciences at the Keck School of Medicine of USC, had published a study using both human and animal data that showed brain aging processes worsened by air pollution may increase dementia risk.\u00a0Their research<\/a>\u00a0indicated that older women who lived in locations with high levels of PM2.5 suffered memory loss and Alzheimer\u2019s-like brain shrinkage not seen in women living with cleaner air.<\/p>\n\n\n\n<\/div>\n <\/div>\n\n\n <\/div><\/div>\n","protected":false},"excerpt":{"rendered":"

Researchers say their studies on air pollution and cognitive decline provide evidence that cleaner air may reduce risk for Alzheimer\u2019s and other dementias.<\/p>\n","protected":false},"author":112,"featured_media":4346,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","footnotes":"","_links_to":"","_links_to_target":""},"categories":[6],"tags":[169,20],"class_list":["post-4344","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-press-release","tag-latest","tag-research"],"acf":[],"yoast_head":"\nUSC studies show that clean air matters for a healthy brain<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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