Association between environmental phthalates exposure and gut microbiota and metabolome in dementia with Lewy bodiesOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This study examined the relationship among urinary phthalate (PAE) metabolites, gut microbiota composition, and gut metabolome profiles in dementia with Lewy bodies (DLB). Researchers measured urinary phthalate metabolite levels using liquid chromatography and profiled gut microbiota and metabolites using high-throughput sequencing and liquid chromatography-mass spectrometry. They then used a fecal microbiota transplantation (FMT) experiment in alpha-synuclein transgenic DLB/Parkinson's disease mice to test whether phthalate-associated gut dysbiosis could contribute to worsening cognitive dysfunction.
Who was studied?
The human portion of the study included 43 patients with dementia with Lewy bodies and 45 normal control subjects, whose urine and fecal samples were analyzed. The animal portion used alpha-synuclein transgenic mice modeling DLB/Parkinson's disease, which received fecal microbiota transplants to test causal effects of gut dysbiosis on cognition.
What were the most important findings?
DLB patients had higher levels of several phthalate metabolites, including DEHP metabolites MEOHP, MEHHP, and MEHP, as well as MMP and MnBP, but lower levels of MBP and MBzP compared to controls. Gut microbiota composition also differed between groups, with a significantly higher abundance of Ruminococcus gnavus and a lower abundance of Prevotella in DLB patients. The FMT experiment was performed to verify whether phthalate-associated gut dysbiosis contributes to aggravating cognitive dysfunction in the DLB/PD mouse model.
What are the greatest implications of this study?
These findings suggest that environmental phthalate exposure is associated with distinct patterns of urinary metabolites and gut dysbiosis in people with dementia with Lewy bodies. The use of an FMT model linking phthalate-associated dysbiosis to cognitive dysfunction raises the possibility that environmental chemical exposures could influence neurodegenerative disease risk through gut microbiota changes. This points to gut microbiota and metabolome profiling as a potential avenue for understanding environmental contributions to DLB and warrants further mechanistic investigation.