Combined l-arginine and antioxidative vitamin treatment mollifies ischemia-reperfusion injury of skeletal muscle

Abstract

Enhanced production of superoxide in L-arginine-depleted environments and concomitant reduction of nitric oxide (NO) concentration are involved in ischemia-reperfusion (I/R) injury. Treatment with L-arginine or antioxidative vitamins alone and in combination was used to mollify I/R injury in skeletal muscle. Untreated rabbits were compared with those treated with L-arginine/antioxidative vitamin cocktail Omnibionta only, or a combination of L-arginine/ antioxidative vitamins during hind limb I/R (2.5 hours/2 hours). NO was continuously measured in vivo. Plasma malondialdehyde (MDA) served as the measure of oxygen free radical formation. Interstitial edema formation, microvessel diameter alterations, microvessel plugging, and blood flow changes were used as indicators of I/R injury. The MDA level in untreated animals 2 hours after reperfusion was significantly higher than in control animals (0.81 micromol/L +/- 0.14 micromol/L vs 0.57 micromol/L +/- 0.11 micromol/L; P<.05), indicating enhanced production of oxygen free radicals. This sequela paralleled the decreasing concentration of NO, which dropped below the detection limit (1 nmol/L) after reperfusion. Microvascular changes during I/R injury were expressed as a 40% decrease in microvessel diameter and adhesion of neutrophils in 20% of microvessels, which led to a consequent 60% reduction in blood flow, demonstrating "no reflow" (reperfusion failure after restoration of blood flow). The increase in the fraction of muscle interfiber area by 85% indicated prominent edema formation. Treatment with antioxidative vitamins alone had a minimally positive effect on edema formation and microvascular plugging, possibly by suppression of oxygen free radical production, as expressed by the reduction in plasma MDA levels. However, this therapy failed to preserve basal NO production and to protect from microvascular constriction and no reflow. Treatment with L-arginine alone had a stronger protective effect, maintaining basal NO production, further reduction of neutrophil plugging, abolition of microvascular constriction, and no reflow. The combination of antioxidative vitamins and L-arginine was the best treatment against I/R injury, expressed not only by the protection of microvessel constriction, but also by abolition of microvascular plugging, increase in NO production (68 nmol/L +/- 5 nmol/L) over the basal level (52 nmol/L +/- 7 nmol/L), and higher blood flow, as compared with treatment with L-arginine or antioxidative vitamins alone.

Protective effect of arginine on oxidative stress in transgenic sickle mouse models

“…The decreases in antioxidant enzymes in sickle mouse models suggest consumption/inactivation of antioxidant enzymes by excessive reactive oxygen species in these models. This is in conformity with the observations that ischemia-reperfusion injury and increased oxidative stress (e.g., superoxide [O 2 •− ]) and hemolysis (e.g., BERK model) lead to consumption and depletion of endogenous NO and antioxidants [26].…”

“…This pattern was confirmed whether using TBARS method in the presence of desferal and BHT (Figure 2A), or using using 8-isoprostane determination in the liver tissue (see Figure 2B). In BERK mice as in human SCD, chronic depletion of arginine levels, reduced NO production and NO consumption by the plasma heme as reported before [11,24,26,35] may all contribute to a proinflammatory milieu and in greater LPO levels.…”

Hyperoxia Exacerbates Myocardial Ischemia in the Presence of Acute Coronary Artery Stenosis in Swine

“…This results in a reduced bioavailability of nitric oxide and to vasoconstriction. 18,19 An animal study also suggested the presence L-type calcium channels on vascular smooth muscle cells, which contribute to blood flow control in an oxygensensitive manner. 20 Metabolic demands are also controlled by ATP-gated potassium channels.…”

Treatment of Post-Revascularization Syndrome: brief communication

“…al., [16] clearly indicates that alterations in production of NO and oxygen free radicals are important in the development of IRI16. As compared with treatment with L-arginine or antioxidative vitamins alone, a combination of both compounds was the best treatment against IRI, as expressed by protection against microvessel constriction, abolition of microvascular plugging, increase in NO production over the basal level, and higher blood flow.…”

“…The aim of the present review is to display the role of those treatments and their level of success, reporting the effective ones in reducing the extension of the injury caused by reperfusion and its aspects [1,2,3,5,6,7,8,11,12,13,15,16,17,18].…”