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Area of Science:

  • Cardiovascular Biology
  • Pharmacology
  • Molecular Biology

Background:

  • Rapamycin exhibits differential effects on blood vessel curvatures.
  • Endothelial nitric oxide synthase (eNOS) plays a crucial role in vasodilation.
  • Understanding eNOS responsiveness to shear stress is key to explaining rapamycin's vascular effects.

Purpose of the Study:

  • To investigate how rapamycin influences endothelial nitric oxide synthase (eNOS) responsiveness to shear stress.
  • To determine if these effects differ under normal and high cholesterol conditions.
  • To elucidate the mechanisms behind rapamycin's differential impact on blood vessel curvatures.

Main Methods:

  • Utilized transgenic mice expressing human eNOS fused to green fluorescence protein.
  • Administered varying doses of rapamycin (low and high) to normocholesterolemic and hypercholesterolemic mice.
  • Quantified eNOS expression and protein levels using en face confocal microscopy and analyzed data with sigmoid curve fitting.

Main Results:

  • Rapamycin increased eNOS expression in control carotid arteries.
  • In treated vessels, rapamycin dose-dependently reduced maximal eNOS expression at high shear stress (>5 Pa) and shifted the response curve.
  • Hypercholesterolemia showed a trend towards exacerbating these rapamycin-induced shifts and reductions in eNOS.

Conclusions:

  • Rapamycin promotes higher eNOS in low shear, atherogenic regions, potentially offering protection against atherosclerosis.
  • Rapamycin reduces eNOS at high shear stress, which may impact vasomotion in these areas.
  • These findings explain rapamycin's distinct effects on different vascular regions and conditions.