Systemic Biomarkers of Brain Injury From Hyperammonemia

Hypoxic-Ischemic Encephalopathy Clinical Trial

Official title:

Systemic Biomarkers of Brain Injury From Hyperammonemia

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT04602325
• Other study ID #: 14021
• Secondary ID: R21TR003166-01
• Status: Recruiting
• Start date: July 9, 2020
• Est. completion date: May 2027

Study information

• Verified date: February 2024
• Source: Children's National Research Institute
• Contact: Katie Rice, MPH, CCRP
• Phone: 202-476-6191
• Email: krice3[@]childrensnational.org
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Ammonia is a waste product of protein and amino acid catabolism and is also a potent neurotoxin. High blood ammonia levels on the brain can manifest as cytotoxic brain edema and vascular compromise leading to intellectual and developmental disabilities. The following aims are proposed:

Aim 1 of this study will be to determine the chronology of biomarkers of brain injury in response to a hyperammonemic (HA) brain insult in patients with an inherited hyperammonemic disorder.

Aim 2 will be to determine if S100B, NSE, and UCHL1 are altered in patients with two other inborn errors of metabolism, Maple Syrup Urine Disease (MSUD) and Glutaric Acidemia (GA1).

Description:

Ammonia is a waste product of protein and amino acid catabolism and is also a potent neurotoxin. The onslaught of high blood ammonia levels on the brain can manifest as cytotoxic brain edema and vascular compromise leading to intellectual and developmental disabilities. In addition, clinical hyperammonemia recurs at varying intervals, which can increase the cumulative damage to the brain and the chance of irreversible coma and death during a hyperammonemia episode due to vascular compromise or brain herniation. The threshold of tolerance for elevated blood ammonia is very low and concentrations above 100 µM can cause brain dysfunction manifested as nausea, vomiting, lethargy, and abnormal behavior; higher concentrations can cause coma and even death. Failure to remove ammonia can be due to inherited defects of the urea cycle, some defects in amino acid catabolism, and degradation of fatty acids.

Aim 1 - To determine the chronology of biomarkers of brain injury - S100B, NSE, and UCHL1 - in response to a hyperammonemic (HA) brain insult in patients with an inherited hyperammonemic disorder. We hypothesized that elevations of S100B, NSE, and UCHL1 will parallel the rise in blood ammonia. These biomarkers will be measured concurrently to ammonia levels throughout hospitalizations for HA until normalization of patient's blood ammonia and mental status.

Aim 2 - To determine if S100B, NSE, and UCHL1 are altered in patients with two other inborn errors of metabolism in which the primary pathology is neurological injury, Maple Syrup Urine Disease (MSUD) and Glutaric Acidemia (GA1). We hypothesize that neuronal and astroglial injury in these disorders may also result in increased levels of S100B, NSE, and UCHL1.

Metabolic patients will be enrolled either during a hospitalization or in outpatient clinic, but outpatient enrollment is preferred. Metabolic patients typically have multiple laboratory tests performed at their outpatient visits. We will obtain the discarded blood samples from such laboratory tests in order to measure S100B, NSE, and UCHL1 levels at baseline (normal blood ammonia), which will provide data on biomarker levels following recovery from a hyperammonemic episode.

During hospitalization for metabolic decompensation or for hypoxic-ischemic encephalopathy, sequential measurements of S100B, NSE and UCHL1 levels will be obtained from discarded blood samples. We will obtain S100B, NSE, and UCHL1 levels from collected discarded blood samples at all subjects' next outpatient visit following their hospitalization, to determine if levels return to baseline.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 24
• Est. completion date: May 2027
• Est. primary completion date: July 2026
• Accepts healthy volunteers: No
• Gender: All
• Age group: 7 Years to 18 Years

Eligibility

Inclusion Criteria:

1. Inherited Hyperammonemias:

1. A clinical diagnosis of 1 of 7 diagnosed urea cycle disorders:

• N-acetylglutamate Synthetase Deficiency (NAGS)

• Carbamyl Phosphate Synthetase Deficiency (CPSD)

• Ornithine Transcarbamylase Deficiency (OTCD)

• Argininosuccinate Synthetase Deficiency (ASD)

• Argininosuccinate Lyase Deficiency (ALD)

• Arginase Deficiency (AD)

• Hyperammonemia-Hyperornithinemia-Homocitrullinuria (HHH)

2. A clinical diagnosis of 1 of 2 organic acidemias:

• Propionic Acidemia (PA)

• Methylmalonic Acidemia (MMA)

2. Acute metabolic disorder without hyperammonemia, with neurological sequelae

1. Maple Syrup Urine Disease (MSUD)

2. Glutaric Acidemia (GA1)

3. Acute metabolic disorder without hyperammonemia and without neurological sequelae

• Fatty Acid Oxidation Disorders:

• Medium Chain-Acyl CoA Dehydrogenase Deficiency

• Very Long Chain-Acyl CoA Dehydrogenase Deficiency

• Trifunctional Protein Deficiency

• Long Chain Hydroxyacyl-CoA Dehydrogenase Deficiency

• Carnitine Palmitoyltransferase I or II Deficiency

• Carnitine/Acylcarnitine Translocase Deficiency

• Primary Carnitine Transport Deficiency

4. Hypoxic-Ischemic Encephalopathy

Exclusion Criteria:

• Prior Solid-Organ Transplant

• Use of any other investigational drug, biologic, or therapy or any clinical or laboratory abnormality or medical condition that, as determined by the investigator, may interfere with or obscure the biomarker measurements

Related Conditions & MeSH terms

• Brain Diseases
• Brain Injuries
• Brain Ischemia
• Fatty Acid Oxidation Disorder
• Glutaric Acidemia I
• Hyperammonemia
• Hypoxia-Ischemia, Brain
• Hypoxic-Ischemic Encephalopathy
• Maple Syrup Urine Disease
• Organic Acidemia
• Urea Cycle Disorder
• Urea Cycle Disorders, Inborn

Locations

Country	Name	City	State
United States	Children's National Research Institute	Washington	District of Columbia

Sponsors (2)

Lead Sponsor	Collaborator
Children's National Research Institute	National Center for Advancing Translational Sciences (NCATS)

Country where clinical trial is conducted

United States, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Biomarker Brain Injury Chronology	Determine the chronology of biomarkers of brain injury (S100B, NSE, and UCHL1) in response to a hyperammonemic (HA) brain insult in patients with an inherited hyperammonemic disorder	2 Years
Secondary	Brain Injury Protein Alterations	Determine if S100B, NSE, and UCHL1 are altered in patients with two other inborn errors of metabolism in which the primary pathology is neurological injury, Maple Syrup Urine Disease (MSUD) and Glutaric Acidemia (GA1)	2 Years