L-Arginine and Taurisolo^® Effects on Brain Hypoperfusion-Reperfusion Damage in Hypertensive Rats.

Area of Science:

• Neuroscience
• Cardiovascular Science
• Pharmacology

Background:

• Hypertension is a major risk factor for cerebral vasculopathy, ischemia, and stroke.
• Understanding microvascular responses to hypoperfusion and reperfusion is crucial for neuroprotection.

Purpose of the Study:

• To compare the effects of arterial pressure reduction on pial microvascular responses during hypoperfusion-reperfusion.
• To evaluate the protective effects of L-arginine and Taurisolo® supplementation in hypertensive rats.

Main Methods:

• In vivo investigation of pial microvascular parameters (diameter, permeability, leukocyte adhesion, capillary perfusion) in Wistar rats.
• Utilized spontaneously hypertensive, dexamethasone-induced hypertensive, and normotensive rats under various dietary supplementations (L-arginine, Taurisolo®, combination).
• Subjected rats to bilateral common carotid artery occlusion followed by reperfusion.

Main Results:

• Hypoperfusion-reperfusion induced significant microvascular changes in all rat groups.
• L-arginine lowered blood pressure and caused vasodilation but did not significantly mitigate hypoperfusion-reperfusion damage.
• Taurisolo® was less effective in blood pressure reduction but prevented microvascular damage.
• The combination of L-arginine and Taurisolo® maintained physiological blood pressure and protected pial microcirculation.

Conclusions:

• Arterial blood pressure reduction alone is insufficient for protecting cerebral circulation from hypoperfusion-reperfusion damage.
• Taurisolo®, particularly in combination with L-arginine, demonstrates significant neuroprotective effects against ischemic injury.
• Combined supplementation offers a promising strategy for mitigating cerebrovascular damage in hypertensive conditions.