Clinical trial NCT02838472: Ascorbic Acid Treatment in Congenital Glucocorticoids and Mineralocorticoids Deficiency Due to NNT Mutation
Official title: Ascorbic Acid Treatment for Patients With Combined Mineralocorticoid and Glucocorticoid Deficiency Secondary to Nicotinamide Nucleotide Transhydrogenase Mutation
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: NA
Conditions: Glucocorticoids Deficiency
Lead sponsor: Hadassah Medical Organization
Sponsor class: OTHER
Collaborators: name: Soroka University Medical Center
First posted: 2016-07-20
Enrollment: 3
Sex: ALL
Minimum age (years): 1
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NON_RANDOMIZED
Intervention model: SINGLE_GROUP
Primary purpose: TREATMENT

Brief summary: Nicotinamide nucleotide transhydrogenase (NNT) mutations cause glucocorticoid and mineralocorticoid deficiencies through decreased detoxification of reactive oxygen species (ROS) in adrenocortical cells.

Ascorbic acid is well known by its high antioxidant activity due to the neutralization of free radicals and other reactive oxygen species.

Preliminary results of NNT_p.G200S homozygous fibroblasts' treatment with 10 micro molar L-ascorbic acid shows significant improvement in mitochondrial morphology and in ROS content.

The aim of this study is to figure out if ascorbic acid treatment improves the phenotype of NNT patients by reducing ROS in their adrenocortical cells and preventing their apoptosis.

Detailed description: Most cases of familial glucocorticoid and mineralocorticoid deficiency are caused by mutations interrupting steroidogenesis such as 21- hydroxylase deficiency. Recently, nicotinamide nucleotide transhydrogenase (NNT) mutations were found to cause isolated glucocorticoid deficiency or combined mineralocorticoid and glucocorticoid deficiency through decreased detoxification of reactive oxygen species (ROS) in adrenocortical cells.

NNT mutation in mice causes also glucose intolerance. Ascorbic acid is an essential water-soluble vitamin with excellent reducing properties, well known by its high antioxidant activity due to the neutralization of free radicals and other reactive oxygen species. This vitamin acts as the first line of defense during oxidative stress in the human body.

Ascorbic acid treatment for variant disease (e.g. - cancer, type 2 diabetes, anxiety, depression, asthma and cardiovascular diseases) have been meticulously studies with no major adverse effects.

In a previous study, the investigators demonstrated a higher ROS levels, a lower ATP content and a change in mitochondrial morphology in NNT_p.G200S homozygous fibroblasts compared with control fibroblasts.

Preliminary results of NNT_p.G200S homozygous fibroblasts' treatment with 10 micro molar L-ascorbic acid shows significant improvement in mitochondrial morphology and in ROS content.

The aim of this study is to figure out if ascorbic acid treatment improves the phenotype of NNT patients by reducing ROS in their adrenocortical cells and preventing their apoptosis.

During the study NNT_p.G200S homozygous patients (no.-3) will be hospitalised for ACTH and OGTT tests and start ascorbic acid treatment at a doses of 75-80% of the upper limit of allowance according to IOM. ACTH and OGTT will be repeated 6 months later to assess improvement in glucocorticoids production and insulin resistance.

Eligibility criteria: Inclusion Criteria:

* NNT mutation homozygous patients with glucocorticoids deficiency

Primary outcomes:
measure: glucocorticoids secretion in response to ACTH test
timeFrame: 1 year
measure: basal ACTH levels
timeFrame: 1 year
Secondary outcomes:
measure: insulin and glucose levels in OGTT
timeFrame: 1 year
Other outcomes:
Locations:
city: Jerusalem
country: Israel
facility: Hadassah medical center
Study officials:
References:
citation: Meimaridou E, Kowalczyk J, Guasti L, Hughes CR, Wagner F, Frommolt P, Nurnberg P, Mann NP, Banerjee R, Saka HN, Chapple JP, King PJ, Clark AJ, Metherell LA. Mutations in NNT encoding nicotinamide nucleotide transhydrogenase cause familial glucocorticoid deficiency. Nat Genet. 2012 May 27;44(7):740-2. doi: 10.1038/ng.2299.
citation: Institute of Medicine (US) Panel on Dietary Antioxidants and Related Compounds. Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids. Washington (DC): National Academies Press (US); 2000. Available from http://www.ncbi.nlm.nih.gov/books/NBK225483/
citation: Weinberg-Shukron A, Abu-Libdeh A, Zhadeh F, Carmel L, Kogot-Levin A, Kamal L, Kanaan M, Zeligson S, Renbaum P, Levy-Lahad E, Zangen D. Combined mineralocorticoid and glucocorticoid deficiency is caused by a novel founder nicotinamide nucleotide transhydrogenase mutation that alters mitochondrial morphology and increases oxidative stress. J Med Genet. 2015 Sep;52(9):636-41. doi: 10.1136/jmedgenet-2015-103078. Epub 2015 Jun 12.