Connection 4 BH4 Depletion and eNOS Uncoupling Beyond Homocysteine Beyond its homocysteine-mediated BH4 oxidation effect, MTHFR impairment reduces BH4 recycling through a second mechanism: the dihydrobiopterin reductase (DHFR) enzyme that regenerates BH4 from BH2 requires dihydrofolate reductase activity an enzyme that uses NADPH to reduce both dihydrofolate to THF and BH2 to BH4
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These requirements are particularly important for peptides, which can present challenges involving identity, salt form, purity, aggregation, degradation products, sterility, endotoxins, and immune reactions
Polanski JF, Soares AD, de Mendonca Cruz OL
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These findings indicate that hyperglycemia induces Mller cell ferroptosis via iron overload, lipid peroxidation and Xc - GSHGPX4 axis dysfunction, which further exacerbates neuroinflammation through microglial reactivation and impairs the BRB