The Impact of Zinc Supplementation on Left Ventricular Function in Nonischemic Cardiomyopathy
|ClinicalTrials.gov Identifier: NCT00696410|
Recruitment Status : Completed
First Posted : June 12, 2008
Results First Posted : October 4, 2017
Last Update Posted : November 6, 2017
Heart failure affects over 5.3 million Americans and, while other cardiovascular diseases have enjoyed a reduction in mortality rates over the last decade, the mortality from heart failure continues to rise. Thus, identifying novel therapies that can reduce heart failure development and/or progression are warranted. Unifying to most cardiomyopathic processes is an impaired handling of reactive oxygen species (ROS)[2-4]. Reactive oxygen species are generated as byproducts of inflammation and oxidative stress that occur in the setting of normal myocardial aerobic metabolism. Metallothionein, glutathione reductase, and superoxide dismutase are major antioxidants in the myocardium that help combat oxidative stress and prevent myocardial damage. In certain clinical settings, including cardiac ischemia, diabetes, and heavy metal excess (copper, iron), myocardial oxidative stress levels are greatly increased. When pro-oxidant levels exceed myocardial antioxidant capabilities, ROS-induced membrane, protein, and DNA inactivation can lead to the development of cardiac dysfunction.
One means of preventing the development or progression of cardiomyopathy is to reduce oxidative stress through up-regulation of intramyocardial antioxidants. Murine studies of cardiomyopathy have shown that oral administration of zinc acetate may succeed as an indirect myocardial anti-oxidant because zinc sufficiently up-regulates the intramyocardial production of superoxide dismutase (a zinc-dependant anti-oxidant enzyme) and metallothionein (a "super antioxidant") [5-8]. Zinc also directly reduces prooxidant Cu levels by reducing gastrointestinal zinc absorption. However, to date, no studies have examined the impact of zinc acetate supplementation in subjects with cardiomyopathy and systolic failure on antioxidant capacity and remodeling.
The hypothesis of this pilot study is that administration of oral zinc acetate to humans with cardiomyopathy will lead to an up-regulation of myocardial anti-oxidant capabilities,leading to a favorable reduction in oxidative stress. This study will provide preliminary data to support a randomized, placebo-controlled trial of zinc therapy in heart failure as a means of improving or preventing the progression of systolic dysfunction in subjects with mild-moderate heart failure.
|Condition or disease||Intervention/treatment||Phase|
|Heart Failure Cardiomyopathies||Drug: Zinc Acetate||Phase 1|
Altered regulation of the transition-metal copper (Cu) may lead to an overproduction of reactive oxygen species (ROS) with subsequent development of a nonischemic cardiomyopathy (NISCM). Myocardial Cu levels are elevated in NISCM, and Cu levels are highest in the "diabetic cardiomyopathy." In humans, zinc (Zn) is an essential component of proteins critical for regulating myocardial cytoskeleton turnover and cellular proliferation. Zn also serves as an antioxidant and indirect regulator of redox-active Cu. By upregulating the chelator metallothionein, Zn reduces the levels of free Cu implicated in oxidative myocardial damage.
Transgenic over-expression of the antioxidant metallothionein has been shown to reduce ROS-induced myocardial damage. In diabetic cardiomyopathy, Cu chelation improves left ventricular (LV) diastolic relaxation abnormalities. However, it is unknown if Zn supplementation could alter the progression of LV systolic dysfunction through Cu depletion and ROS reduction. The aim of this pilot study is to assess the impact of a novel intervention, Zn supplementation, on myocardial remodeling by examining changes in serum levels of the types I (PINP) and III (PIIINP) collagen N-terminal propeptides. The primary study hypothesis is that Zn supplementation will have a favorable impact on the pathophysiology of NISCM by either repleting a Zn deficiency/insufficiency or by reducing myocardial damage and adverse remodeling in the setting of redox-active Cu excess.
Stable outpatients (n=40) with chronic NISCM (ejection fraction ≤40%) will receive daily oral Zn-acetate (50 mg po tid) for 10 months. Serum PINP, PIIINP, and markers of inflammation (CRP, sedimentation rate, myeloperoxidase) and oxidative stress (8-isoprostane, superoxide dismutase) will be obtained at baseline and following 10 months of Zn supplementation. Changes in collagen turnover will then be correlated with changes noted in LV systolic and diastolic function by echocardiography. Finally, we will examine for a differential treatment effect of Zn therapy in a diabetic subset (n=20) with NISCM compared with the nondiabetics.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||48 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||None (Open Label)|
|Official Title:||Pilot Study to Assess the Impact of Zinc Supplementation on Left Ventricular Remodeling, Function, and Oxidative Stress in Nonischemic Cardiomyopathy|
|Study Start Date :||June 2008|
|Primary Completion Date :||June 2011|
|Study Completion Date :||June 2011|
Experimental: CHF patients Given Zinc Acetate
Patients with CHF received zinc acetate 50 mg po TID. This is a pre-post study
Drug: Zinc Acetate
Zinc acetate 50 mg po TID for 10 months. Dose will be titrated to achieve ceruloplasmin levels ~10-12.
Other Name: Galzin (zinc acetata, Teva Pharmaceuticals)
No Intervention: Healthy controls
Health controls; no zinc acetate administered.
- Change From Baseline in Markers of Cardiac Collagen Turnover (PINP) in Patients With Systolic Heart Failure and Compared With Healthy Controls. [ Time Frame: Baseline (time 0) and after 10 months of Zinc Acetate. ]The intervention group (patients with systolic heart failure) was given Zinc Acetate 50 mg po three times daily for 10 months. The change from baseline in markers of cardiac collagen turnover (PINP) in patients with systolic heart failure after 10 months of zinc acetate was measured and compared with a single measure from healthy controls.
- Change From Baseline in Serum Isoprostane in Patients With Systolic Heart Failure [ Time Frame: Baseline (time 0) and 10 months ]Change from baseline in serum isoprostane 10 months after Zn Acetate in patients with systolic heart failure and compared with a single measure in healthy subjects
- Change in PIIINP From Baseline After 10 Months of Zinc Acetate in Systolic Heart Failure and Compared With a Single Measure in Healthy Controls [ Time Frame: Baseline (time 0) and 10 months ]Change in PIIINP from baseline after 10 months of Zinc Acetate in patients with systolic heart failure and compared with a single measure in healthy controls
- Change From Baseline in Serum Superoxide Dismutase [ Time Frame: Baseline (time 0) and 10 months ]Change from baseline in serum superoxide dismutase after 10 months of zinc acetate in patients with systolic heart failure and compared with a single measure in healthy controls
- Change From Baseline in Serum Measures of of Myeloperoxidase (MPO) After 10 Months of Zinc Acetate Treatment [ Time Frame: Baseline (time 0) and 10 months ]Change from baseline in serum myeloperoxidase (MPO) after 10 months of zinc acetate treatment in patients with systolic heart failure and compared with a single measure from healthy controls
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00696410
|United States, Michigan|
|University of Michigan Health System|
|Ann Arbor, Michigan, United States, 48109|
|Principal Investigator:||Keith D Aaronson, MD, MS||University of Michigan|
|Study Chair:||Jennifer A Cowger, MD, MS||University of Michigan|