Urea and Ammonia

Urea and ammonia are nitrogen-containing metabolites involved in the body's disposal of excess nitrogen. Ammonia is produced during amino acid catabolism and is extremely toxic, particularly to neurons. The liver converts ammonia into urea via the urea cycle—a series of enzymatic reactions that make ammonia safe for excretion. Urea is then released into the bloodstream and excreted primarily via the kidneys. Both molecules play central roles in nitrogen excretion, osmotic regulation, and acid-base homeostasis. Disruption of urea or ammonia metabolism leads to metabolic and neurological diseases, such as urea cycle disorders, hepatic encephalopathy, and acute or chronic kidney failure[1][3][4][5][6][2][8]. Key context: - These are metabolic intermediates, not molecular targets (receptor, enzyme, transporter, etc.). - Disease-modifying strategies target enzymes or transporters of these pathways, not urea or ammonia themselves. - Ammonia accumulation is directly toxic; urea accumulation is mostly a marker, not a toxin per se[5][6]. - Drugs may target the pathways or processes that regulate their metabolism or excretion[4]. "Urea and Ammonia" as a combined molecular target entry is incorrect; correct targets would be individual components of the urea cycle or ammonia metabolism pathways.

Other names

CarbamideAzaneNH3

Promoting alternative nitrogen excretion pathways (through scavenger drugs)[4] Enhancing conversion or removal of ammonia (e.g., by gut acidification or bacterial modulation)