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GTP-cyclohydrolase deficiency induced peripheral and deep microcirculation dysfunction with age.

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Impaired tetrahydrobiopterin (BH4) production significantly alters microcirculation vasoreactivity, particularly in aging mice. This study highlights BH4

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Area of Science:

  • Vascular Biology
  • Biochemistry
  • Aging Research

Background:

  • Tetrahydrobiopterin (BH4) is crucial for vascular homeostasis, regulating nitric oxide synthase 3 (NOS3) activity.
  • Aging impacts vascular function, and impaired BH4 production may exacerbate these changes.
  • The GTP cyclohydrolase I (GCHI) enzyme is rate-limiting in BH4 biosynthesis.

Purpose of the Study:

  • To assess the effect of impaired BH4 production on vasoreactivity in conduit and small arteries during aging.
  • To investigate the role of BH4 deficiency in age-related vascular dysfunction using a mouse model.

Main Methods:

  • Utilized the hyperphenylalaninemic mouse (hph-1) model, deficient in GCHI and thus BH4.
  • Measured BH4 and cyclic guanosine monophosphate (cGMP) levels in aortic tissues.
  • Assessed vasoreactivity in mesenteric arteries, coronary microcirculation, cutaneous microcirculation, and aortic rings.
  • Employed flow-mediated dilation, coronary hyperemia response, and acetylcholine-induced dilation assessments.

Main Results:

  • BH4 levels were significantly reduced in hph-1 mice (-77% to -83%).
  • Aging exacerbated vascular dysfunction in BH4-deficient mice, with significant reductions in cGMP, flow-mediated mesenteric artery dilation, coronary hyperemia, and cutaneous microcirculation dilation.
  • Conduit artery (aorta) vasoreactivity remained unchanged, indicating a specific impact on microcirculation.

Conclusions:

  • Reduced BH4 production significantly impairs microcirculation vasoreactivity, especially in aging.
  • The effects of BH4 deficiency are more pronounced in smaller vessels than in large conduit arteries.
  • BH4 deficiency contributes to age-related vascular dysfunction, primarily affecting microvascular beds.