Description: <p><b>Coumestrol</b></p>
<p><b>Recommended Abbreviation:</b> CML</p>
<p><b>Type:</b> Natural product / coumestan / phytoestrogen / polyphenolic compound</p>
<p><b>Source:</b> Coumestrol is a naturally occurring coumestan found in legumes and other plants, including alfalfa, clover, soybeans, spinach, Brussels sprouts, and <i>Pueraria lobata</i>.</p>
<p><b>Function:</b> Coumestrol is a phytoestrogen that binds estrogen receptors ERα and ERβ, with substantial estrogen-receptor activity. It also exhibits antioxidant, anti-inflammatory, antiproliferative, and neuroprotective effects and can modulate PI3K/AKT, MAPK, HIF-related signaling, mitochondrial function, and cholinergic enzymes.</p>
<p><b>Cancer:</b> Coumestrol generally demonstrates anticancer activity in preclinical models, including proliferation ↓, migration/invasion ↓, mitochondrial membrane potential ↓, ROS ↑, apoptosis ↑, caspase activation ↑, and modulation of PI3K/AKT, ERK, JNK, and HIF signaling. Because coumestrol is a potent phytoestrogen and activates both ERα and ERβ, its effects in hormone-sensitive cancers can be concentration-, receptor-, and tissue-dependent.</p>
<p><b>Alzheimer's Disease:</b> Coumestrol has demonstrated experimental neuroprotective activity relevant to Alzheimer's disease. Reported mechanisms include antioxidant and peroxynitrite-scavenging activity and inhibition of acetylcholinesterase and butyrylcholinesterase, which may support cholinergic signaling. Broader evidence also supports anti-inflammatory and neuroprotective effects, although clinical evidence for Alzheimer's disease is not established.</p>