Impact of Nrf2 Activation on Macrovascular, Microvascular & Leg Function & Walking Capacity in Peripheral Artery Disease

Peripheral Arterial Disease Clinical Trial

Official title: Impact of Nrf2 Activation on Macrovascular Function, Microvascular Function, Leg Function, and Walking Capacity in Patients With Peripheral Artery Disease

Status Not yet recruiting

Clinical Trial Summary

Purpose: Peripheral artery disease (PAD) is associated with elevated oxidative stress, and oxidative stress has been implicated as the cause of reduced endothelial reactivity in individuals with PAD. Endothelial function is important because the endothelium contributes to the dilation of arteries during exercise, thereby implicating impaired endothelial function as a mechanism contributing to exacerbated exercise-induced ischemia. Therefore, the purpose of this study is to test the hypothesis that acute exogenous diroximel fumarate (Vumerity) intake will improve antioxidant capacity, thereby reducing oxidative stress and improving vascular function and walking capacity in those with PAD. Eligibility: Individuals with PAD will be deemed eligible for this study if they 1) are 50-75 years old and postmenopausal, 2) have a positive history of exercise-limiting claudication (Fontaine II or III), 3) do not have renal impairments, 4) do not have Fontaine stage IV PAD, and 5) are not currently pregnant or nursing. Age-matched controls will be deemed eligible for this study if they 1) are 50-75 years old and postmenopausal, 2) have an ABI greater than 0.9 (no PAD), 3) do not have exercise-limiting diseases or injuries, 4) do not have renal impairments, and 5) are not currently pregnant or nursing. Intervention and Evaluation: During this study, participants will be administered diroximel fumarate or a placebo, and the acute effects of diroximel fumarate on vascular function and walking capacity will be assessed. Vascular function and walking capacity will be assessed with flow-mediated dilation, arterial stiffness, head-up tilt test, blood biomarkers, near-infrared spectroscopy, and a treadmill test. Follow-up: There will be a follow-up visit to assess blood work after diroximel fumarate.

Clinical Trial Description

Peripheral artery disease (PAD), which affects an estimated 200 million individuals worldwide, is characterized by the development of atherosclerotic plaques in the conduit arteries of the back and legs, and leads to exercise-limiting ischemic muscle pain, soft tissue ulcers, gangrene, and ultimately amputation. The pathophysiology of PAD is multifaceted and includes macro-vascular dysfunction, micro-vascular dysfunction, and muscle myopathy. A popular hypothesis for the tissue damage that occurs after conduit artery stenosis is the ischemia-reperfusion hypothesis. Under this hypothesis, intermittent periods of ischemia and hypoxia, followed by rapid oxygen reperfusion, ultimately leads to the production of excessive reactive oxygen species (ROS) in the ischemic tissues, and the intermittent elevations in ROS may exacerbate the degradation of mitochondrial function. Damage to mitochondria may then lead to greater ROS production, thereby creating a vicious cycle of oxidative stress damage and subsequent damage to muscles and blood vessels distal to a stenosis. In alignment with this hypothesis, it has been demonstrated that those with PAD have impaired blood vessel function, demonstrated by low endothelial reactivity. Furthermore, it seems that the reduced vascular reactivity in those with PAD may be partially caused by elevated ROS production, since the introduction of mitochondrial targeted antioxidants and free nitrates can improve vascular reactivity in those with PAD. Reduced endothelial reactivity may have deleterious effects for those with PAD during walking, since the endothelium dilates the arteries when shear increases at the onset of exercise, thereby highlighting a potential mechanism that may exacerbate exercise-induced ischemia. Interestingly, improvements in vascular reactivity mediated by mitochondrial derived antioxidants and free nitrates are paralleled by improvements in walking performance. This highlights the potential importance of ROS management in the treatment of those with PAD and may indicate an effective pharmacological target to improve vascular health and functional capacity in those with PAD.

A potentially effective pharmacological target for oxidative stress management in those with PAD may be the nuclear factor erythroid 2-related factor 2 (Nrf2)-Kelch-like ECH-associated protein 1 (Keap1) complex because NRF2 is directly involved in the cellular response to oxidative stress. Keap1 promotes the ubiquitination and destruction of intracellular NRF2, which keeps the concentration of NRF2 low in the cytosol under normal conditions. However, molecules that react with Keap1, such as reactive oxygen species, impede Keap1s ability to prevent NRF2 from accumulating. When NRF2 accumulates, it is translocated into the cell nucleus and acts as a transcription factor for several cellular antioxidants, which bind to molecules that cause oxidative stress, thereby reducing cellular oxidative damage. Therefore, substances that target the Keap1-NRF2 complex may be useful for reducing oxidative stress in those with PAD.

Of note, diroximel fumarate is a compound that directly interacts with the Keap1-NRF2 complex by its derivative monomethyl fumarate, and diroximel fumarate has been shown to reduce inflammation via this mechanism in those with multiple sclerosis. Therefore, the investigators postulate that diroximel fumarate may increase antioxidant capacity in those with PAD via the NRF2 mechanism, which may lead to improved endothelial function and walking capacity. However, there are currently no studies that have investigated the effects of acute diroximel fumarate intake on vascular function and walking capacity in individuals with PAD. Therefore, the investigators propose to test the hypothesis that acute exogenous diroximel fumarate intake will improve micro- and macro-vascular function, leg skeletal muscle mitochondrial function, and walking capacity in participants with PAD. ;

Related Conditions & MeSH terms

• Arterial Occlusive Diseases
• Peripheral Arterial Disease
• Peripheral Arterial Occlusive Disease
• Peripheral Artery Disease
• Peripheral Vascular Diseases
• Vascular Diseases

• NCT number: NCT06319339
• Study type: Interventional
• Source: University of Nebraska
• Contact: Song-Young Park, PhD
• Phone: 402-554-3374
• Email: song-youngpark@unomaha.edu
• Status: Not yet recruiting
• Phase: Early Phase 1
• Start date: August 2024
• Completion date: August 2025