Mouse study links polyethylene microplastics to worse fatty liver injury
University of Oklahoma researchers found stronger liver injury signals in mice exposed to microplastics while eating a high-fat diet.
By Tom Brennan · Health & Medicine Correspondent
3 min read
A University of Oklahoma mouse study suggests polyethylene microplastics can intensify liver injury when combined with a high-fat, high-cholesterol diet. The findings matter because the research team says microplastics are widely encountered and fatty liver disease is tied to diet-driven metabolic stress.
The peer-reviewed study, published in Science Advances, examined polyethylene, which the university described as the most common plastic and a material used in items such as plastic bags and milk jugs. The work was led by Tae Gyu Oh, an assistant professor of oncology science in the OU College of Medicine, according to the university.
According to the study, mice that received microplastics while eating a high-fat diet had blood markers of liver injury more than twice as high as mice exposed to the same particles while eating a standard diet. The researchers said the high-fat, high-cholesterol diet was designed to model metabolic dysfunction-associated steatohepatitis, or MASH, a serious form of fatty liver disease.
How the experiment was run
The OU team gave mice equal amounts of microplastics over an eight-week period, according to the university. One group ate a standard diet, while another ate the diet meant to mimic MASH conditions.
Oh’s team then studied liver tissue with several technologies, the university said. Those methods showed evidence of liver damage, but the researchers reported that spatial transcriptomics gave the most detailed picture of where injury was occurring inside the organ.
According to the university, spatial transcriptomics allowed the researchers to locate damage in specific regions rather than average signals across millions of cells, as bulk transcriptomics can do. The OU team said its use of that technology for this question is believed to be a first.
Oh said, according to the university, that the higher-resolution method let the team identify localized areas of liver injury at single-cell scale that older approaches would not have detected. The study reported inflammation and changes in biological pathways in regions affected by microplastic exposure.
Repair pathways draw attention
The study also pointed to PPAR-alpha, a cell protein involved in fat use and breakdown, as part of the liver’s response to microplastic exposure. According to the university, PPAR-alpha influences Anxa2, a gene linked to tissue repair.
Oh said the findings indicate that microplastics may interfere with some of the liver’s protective and repair responses, according to the university. He said understanding that relationship could help guide future work on protecting liver health.
The researchers cautioned that the study was done in mice, and the university said further research is needed to determine whether the same effects occur in people. The study’s authors said the work offers a framework for studying how environmental exposures such as microplastics may contribute to liver disease.
The publication is titled “Spatial transcriptome mapping identifies Ppara-Anxa2 cross-talk in microplastic-induced hepatotoxicity.” Its listed authors include Woncheol Jung and colleagues, according to Science Advances.
This story draws on original reporting from Medical Xpress.