Rhein / Akt Cancer Research Results

Rhein (4,5-dihydroxyanthraquinone-2-carboxylic acid) is a naturally occurring anthraquinone found particularly in rhubarb (Rheum palmatum, Rheum officinale and related species), as well as Polygonum multiflorum, Cassia species and Aloe. Rhein has demonstrated anti-inflammatory, antioxidant, antifibrotic, metabolic, neuroprotective and anticancer activities in preclinical studies. In cancer models, rhein can suppress proliferation, migration and invasion and promote cell-cycle arrest and apoptosis through mechanisms involving PI3K/AKT, MAPK, NF-κB, p53, mitochondrial apoptosis, oxidative-stress signalling and other pathways. Alzheimer-related experimental studies also suggest neuroprotective and anti-neuroinflammatory activity, including modulation of microglial metabolism and inflammatory signalling. Rhein should be maintained as a separate product from emodin, aloe-emodin, chrysophanol, physcion and whole rhubarb extracts because it is a chemically distinct anthraquinone with its own pharmacological and toxicological profile. Current therapeutic evidence remains predominantly preclinical, and potential hepatic and renal toxicity as well as poor water solubility and bioavailability should be considered when interpreting experimental findings.