Gut microbiota modulation via fecal microbiota transplantation mitigates hyperoxaluria and calcium oxalate crystal depositions induced by high oxalate dietOriginal 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?
Researchers examined whether fecal microbiota transplantation (FMT) could counter secondary hyperoxaluria caused by a high oxalate diet (HDOx) in rats. They focused on gut microbiota shifts, metabolite changes, and calcium oxalate (CaOx) crystal formation in the kidney.
How was it studied?
Rats fed a high oxalate diet developed hyperoxaluria models with dose-dependent increases in urinary oxalate and CaOx crystal deposition. Investigators then transplanted fecal microbiota from healthy rats on a standard pellet diet and assessed microbiota composition, metabolomic profiles, and intestinal barrier and oxalate transporter expression.
What did they find?
High oxalate diet reduced gut microbiota diversity, with shifts in Ruminococcaceae_UCG-014 and Parasutterella and drops in their associated metabolites. FMT from healthy donors restored these bacterial populations and metabolites while reducing urinary oxalate excretion and CaOx crystal deposits, partly by upregulating intestinal barrier proteins and oxalate transporters.
Why it matters
The findings link diet-driven gut microbiota and metabolite disruption to secondary hyperoxaluria and kidney stone risk. They suggest microbiota-restoring interventions like FMT as a potential targeted strategy for hyperoxaluria linked to high dietary oxalate intake.