BH4

Cross-source consensus on BH4 from 1 sources and 5 claims.

1 sources · 5 claims

How it works

BH4 is a rate-limiting cofactor for all three NOS isoforms and is also required for serotonin and dopamine synthesis from phenylalanine. — Nitric Oxide, Methylation, and the Microbiome: A Clinical Integration Framework
BH4 is recycled from its oxidized form BH2 by DHFR; methotrexate is a known inhibitor of this enzyme and can impair the recycling loop. — Nitric Oxide, Methylation, and the Microbiome: A Clinical Integration Framework
As homocysteine rises, BH4 bioavailability falls, simultaneously impairing both NO production and neurotransmitter synthesis. — Nitric Oxide, Methylation, and the Microbiome: A Clinical Integration Framework
When stimulated by LPS or IFN-γ, GTPCH1 preferentially produces neopterin instead of BH4, diverting the pathway away from NO production. — Nitric Oxide, Methylation, and the Microbiome: A Clinical Integration Framework
A neopterin level above 2.0 nmol/L signals that immune activation is consuming BH4 at the expense of NO and neurotransmitter production. — Nitric Oxide, Methylation, and the Microbiome: A Clinical Integration Framework