Protein-bound uremic toxin (PBUT)

Protein-bound uremic toxins (PBUTs) are a broad class of small, low molecular weight toxic molecules that accumulate in the bloodstream of patients with impaired kidney function, especially chronic kidney disease. These toxins are generated mainly by gut microbial metabolism of dietary proteins and are characterized by a strong binding affinity to plasma proteins, primarily albumin, which makes them difficult to eliminate by standard dialysis methods. PBUT accumulation is implicated in the development of uremic syndrome, cardiovascular disease, inflammation, and immune dysfunction. Key representatives of this group include indoxyl sulfate, p-cresyl sulfate, hippuric acid, among others. Due to their problematic removal and central role in disease pathology, PBUTs are the focus of ongoing research and therapeutic innovation, particularly around displacing them from albumin to enhance their clearance[1][3][4][6][7].

Other names

Protein-bound uremic toxinsPBUTsprotein-bound solutes

Competitive displacement from albumin binding sites to increase the free fraction and facilitate removal by dialysis or filtration