Putrescine (PUT) (PUT)

Putrescine is a ubiquitous biogenic polyamine (1,4-diaminobutane) that plays a fundamental role in cellular growth, differentiation, and survival by stabilizing nucleic acids and modulating protein synthesis (Wikipedia, 2024). It is primarily synthesized from the amino acid ornithine via the action of ornithine decarboxylase (ODC), the rate-limiting enzyme in the polyamine biosynthetic pathway (NIH, 2014). Elevated levels of putrescine are a hallmark of many hyperproliferative states, including various cancers and parasitic infections such as African Trypanosomiasis, where it supports rapid cell division (PubMed, 2022). Although putrescine is a small molecule metabolite rather than a protein target, it is the central focus of therapeutic strategies designed to disrupt polyamine homeostasis (NIH, 2022). Drugs like eflornithine (DFMO) act by irreversibly inhibiting ODC, thereby depleting intracellular putrescine and halting tumor growth or parasitic replication (StatPearls, 2023). Additionally, putrescine acts as an endogenous modulator of various ion channels, including NMDA receptors and inward rectifier potassium channels, influencing neuronal excitability (PubMed, 1996). Therapeutic challenges in targeting this pathway include the potential for compensatory uptake of exogenous polyamines from the diet or gut microbiota, necessitating the development of transport inhibitors (PubMed, 2009). Monitoring putrescine levels in urine or blood can serve as a valuable biomarker for assessing tumor burden and the efficacy of polyamine-depletion therapies (NIH, 2014).

Other names

1,4-DiaminobutaneTetramethylenediamineButane-1,4-diamine1,4-ButanediamineButylenediamine

Inhibition of ornithine decarboxylase (ODC) to deplete intracellular polyamine pools, competitive inhibition of polyamine transport systems, and modulation of NMDA receptor activity.