Ergothioneine is a water-soluble thiol compound that is of interest to scientists and consumers for its potential beneficial effects as an antioxidant, which may protect against oxidative stress, as well as its anti-inflammatory, neuroprotective, and antiaging properties. Due to its potential benefits for the skin, it is found in some skin care products.
Ergothioneine cannot cross the plasma membrane of cells unless they express the ergothioneine transporter ETT (originally designated as OCTN1; human gene symbol SLC22A4). Ergothioneine specifically accumulates to millimolar concentrations in cell types that are normally subjected to high levels of oxidative stress (including erythrocytes and plasma). In humans, abnormal ETT and ergothioneine levels have been implicated in rheumatoid arthritis and Crohn's disease.
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