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Indole

Molecular classification: Microbial metabolite, Uremic toxin precursor, Organic heterocyclic compound

Overview

Indole is a microbial metabolite produced in the human gut, primarily through the bacterial metabolism of the essential amino acid L-tryptophan. It serves as a key precursor to several uremic toxins, most notably indoxyl sulfate and indole-3-acetic acid, which accumulate in patients with impaired kidney function and contribute to systemic toxicity. In chronic kidney disease (CKD), reduced excretion leads to the accumulation of protein-bound uremic toxins (PBUTs) such as indoxyl sulfate, resulting in vascular damage, heightened morbidity and mortality, proinflammatory signaling, and oxidative stress.

Other names: Indol1H-Indole

Biological functions

Precursor to uremic toxinsModulation of host physiologyAryl hydrocarbon receptor (AhR) activationPregnane X receptor (PXR) activationIntestinal barrier integrity disruptionImmune response modulation

Disease associations

Chronic kidney disease (CKD)Endothelial dysfunctionInflammationOxidative stressCardiovascular disease

Safety considerations

Accumulation in renal impairment leading to systemic toxicityCytotoxic effects on endothelial cellsPromotion of proinflammatory signaling

Biomarkers

Plasma/serum levels of indole and its derivatives (e.g., indoxyl sulfate) as biomarkers for CKD progression

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