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A rare disorder of phenylalanine and tyrosine metabolism characterized by the accumulation of homogentisic acid (HGA) and its oxidized product, benzoquinone acetic acid (BQA), in various tissues (e.g. cartilage, connective tissue) and body fluids (urine, sweat), causing urine to darken when exposed to air as well as grey-blue coloration of the sclera and ear helix (ochronosis), and a disabling joint disease involving both the axial and peripheral joints (ochronotic arthropathy).
Curcumin's antioxidant properties via NRF2 activation combined with nitisinone's HGD inhibition creates synergistic reduction of homogentisic acid oxidation and downstream inflammatory cascades through MAPK/NF-ฮบB pathway suppression
Genistein acts as a pharmacological chaperone stabilizing mutant HGD enzyme conformations through hydrogen bonding with catalytic domain, potentially restoring partial enzymatic activity and reducing homogentisic acid accumulation
Withanolides from ashwagandha inhibit cartilage degradation by modulating MMP-1, MMP-3, and MMP-13 expression while promoting COL2A1 and ACAN gene expression, potentially protecting against ochronotic arthropathy progression
mTOR inhibition by rapamycin activates TFEB-mediated lysosomal biogenesis and enhances autophagy flux, potentially promoting cellular clearance of accumulated homogentisic acid polymers and ochronotic pigment deposits
SGLT2 inhibitors modify renal tubular transport mechanisms and may enhance organic acid clearance through interactions with OAT1/OAT3 transporters, potentially increasing homogentisic acid elimination and reducing systemic accumulation
SIRT1/SIRT3 activation redirects tyrosine metabolism away from homogentisic acid production by enhancing alternative catabolic pathways and improving mitochondrial function through PGC-1ฮฑ upregulation and FOXO1 activation