Key result
Acute tetrahydrobiopterin (BH4) supplementation did not affect vascular function, as measured by flow-mediated vasodilation, in older adults.
Why the study?
Does acute tetrahydrobiopterin (BH4) supplementation improve vascular function in older adults?
Does acute tetrahydrobiopterin (BH4) supplementation improve vascular function in older adults?
Acute BH4 supplementation does not correct vascular dysfunction in older adults, likely because elevated oxidative stress maintains an unchanged BH4/BH2 ratio.
Acute BH4 does not improve FMD in older adults; leaves open chronic dosing or targeted antioxidant strategies.
Despite two different experimental approaches, acute BH 4 supplementation did not affect vascular function in older adults, as measured by flow-mediated vasodilation. Plasma levels of both BH 4 and BH 2 , the BH 4 oxidized form, significantly increased after acute BH 4 supplementation, resulting in an unchanged ratio of BH 4 /BH 2 , a key determining factor for endothelial nitric oxide synthase coupling. Therefore, likely due to the elevated oxidative stress with advancing age, acute BH 4 supplementation does not correct vascular dysfunction in the old.
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Bisconti et al. (2022) studied vascular dysfunction. acute tetrahydrobiopterin (BH4) supplementation was evaluated on vascular function as measured by flow-mediated vasodilation. Acute tetrahydrobiopterin (BH4) supplementation did not affect vascular function, as measured by flow-mediated vasodilation, in older adults.
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