In female cynomolgus macaques eating a Western diet, higher levels of the gut bacterium Prevotella copri are linked to increased levels of certain metabolites in urine and blood that are known to...
Mechanism
Synthesis from 1 study
A high-fat diet makes a certain gut bacterium grow too much, which causes other gut bugs to make harmful chemicals that the kidneys can't handle. These chemicals build up and damage the kidney's filtering system, showing up as early signs of trouble. Other good bacteria can help protect the...
Most probable mechanism
When a high-fat diet feeds a specific gut bacterium called Prevotella copri, it changes the mix of other gut bacteria and causes them to produce harmful chemicals that the kidneys can't properly filter. These chemicals build up in the blood and urine, damaging the kidney's filtering tubes and making it harder for the kidneys to clean the blood, which shows up as early signs of kidney stress.
Consumption of a high-fat diet enriches Prevotella copri in the gut microbiome, suppressing microbial diversity and altering community composition
Altered microbial metabolism increases production of acyl-carnitine derivatives, symmetric dimethylarginine, and allantoic acid
Elevated acyl-carnitine derivatives overwhelm renal tubular reabsorption capacity, leading to their excretion in urine
Symmetric dimethylarginine inhibits nitric oxide synthesis, reducing blood flow and increasing oxidative stress in renal tubules
Allantoic acid and other uremic toxins accumulate in plasma due to reduced glomerular filtration and tubular dysfunction
Systemic accumulation of these metabolites induces low-grade inflammation and tubular epithelial damage, marking early kidney dysfunction
Less supported by current evidence, but not ruled out
In some individuals, a different gut bacterium converts dietary fats into compounds that raise good cholesterol, which may help protect blood vessels and reduce kidney strain, but this pathway is only active when Prevotella copri is low.
Low Prevotella copri abundance permits higher colonization by Eubacterium siraeum
Eubacterium siraeum converts linoleic acid into conjugated linoleic acids
Conjugated linoleic acids increase plasma HDL cholesterol levels
Higher HDL improves vascular function and reduces systemic inflammation, indirectly mitigating renal stress
Some gut bacteria produce compounds that strengthen the gut lining and reduce inflammation, which may prevent harmful substances from reaching the kidneys, but this only happens when Prevotella copri is not dominant.
Higher abundance of Bacteroides uniformis and Lactobacillus species is associated with reduced systemic inflammation
Lactobacillus and Clostridium species metabolize tryptophan into indole-3-propionate
Indole-3-propionate enhances intestinal barrier function and reduces leakage of bacterial endotoxins into circulation
Reduced endotoxin exposure lowers systemic inflammation and oxidative stress, indirectly protecting kidney function
Evidence from Studies
Supporting (1)
Community contributions welcome
Diet, obesity, and the gut microbiome as determinants modulating metabolic outcomes in a non-human primate model
Contradicting (0)
Community contributions welcome
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