Indole-3-carboxylic acid

Indole-3-carboxylic acid (CAS No.: 771-50-6) is an endogenous indolic metabolite derived from tryptophan and commonly detected in urine, with elevated levels reported in certain pathological conditions such as liver disease, highlighting its relevance in metabolic and hepatic research. As a small bioactive molecule, it exhibits modulatory effects on cellular processes through interactions with enzyme systems and the regulation of multiple signaling pathways associated with inflammation, cell cycle control, and metabolic homeostasis. In oncology-related studies, it has demonstrated cytotoxic activity against various human cancer cell lines and has been shown to enhance the efficacy of chemotherapeutic agents such as doxorubicin by promoting cellular senescence, with observed activity generally in the low micromolar range. Additionally, it has been reported to inhibit viral replication in infected lymphocytes, supporting its investigation in antiviral research contexts. Beyond mammalian systems, it also functions as a plant-derived metabolite involved in defense priming against pathogenic fungi, underscoring its conserved biological roles across species. Indole-3-carboxylic acid is widely utilized in in vitro and in vivo models to study liver function, cancer biology, host–pathogen interactions, and metabolic regulation, and also serves as a useful intermediate in the synthesis of bioactive compounds, making it a valuable tool in drug discovery and life sciences research.