Curcumin on NFE2L2 Gene Expression, Antioxidant Capacity and Renal Function According to rs35652124 in Diabetic Nephropathy (CURCUNRF2)

May 28, 2018 updated by: Unidad de Investigacion Medica en Enfermedades Renales

Interaction of Polymorphism rs35652124 With Curcumin Supplementation on NFE2L2 Gene Expression, Antioxidant Capacity and Renal Function in Patients With Early Diabetic Nephropathy

The increase in the prevalence of diabetes mellitus (DM) is one of the greatest public health challenges worldwide. Epidemiological studies have shown that DM is the leading cause of chronic kidney disease (CKD) in patients initiating renal replacement therapy. In our country, diabetes accounts for about 60% of all incidents of dialysis. On the other hand, CKD is currently considered a noxious disease because patients not only have the likelihood of progression to end-stage renal disease (ESRD), but because these renal alterations are associated with an increased risk of cardiovascular complications and premature death for the same cause. Most studies have focused on traditional risk factors (poor diet, physical inactivity and obesity) for the development and progression of renal damage, and less information exists on non-traditional factors such as oxidative stress and mainly, the low antioxidant response that characterizes both DM and nephropathy. In addition, there is a great variation in the susceptibility to and progression of kidney disease between different populations that is not explained by the presence of traditional factors and that could be triggered by genetic variations and its interaction with other components related to the environment and lifestyle. Fortunately, there is sufficient scientific evidence that early detection and modification of negative lifestyle factors can not only delay or halt the progression of the renal function decline to ESRD but can also significantly reduce the incidence of cardiovascular disease leading to premature death in most of these patients. Therefore, it is suggested that this risk may be determined by the interaction of lifestyle factors with the presence of susceptibility alleles, which may vary from one population to another. It is now known that hyperglycemia causes a state of oxidative stress and inflammation that can be counteracted by diet supplementation with some natural antioxidants such as curcumin. It has been shown that this molecule has multiple pharmacological properties: antioxidant, anti-inflammatory, cardioprotective, renoprotective, among others. In clinical trials a positive effect of curcumin has been seen in the treatment of diabetes and its complications. This has generated a relative optimism in the search for new curcumin treatment targets where oxidative stress is of great relevance, as is the case with CKD. However, there are still doubts about its efficacy as an adjuvant in the prevention of CKD. Additionally, the role played by interindividual variability in genes involved in the mechanism of action of curcumin is still incipient, more studies in this knowledge area are necessary.

Study Overview

Status

Unknown

Conditions

Intervention / Treatment

Detailed Description

Aim: To evaluate the interaction between rs35652124 polymorphism and curcumin supplementation on the levels of NFE2L2 gene expression, antioxidant capacity and renal function in patients with early diabetic nephropathy (EDN).

Subjects and Methods. Parallel clinical trial with randomized and triple blind. From a database of diabetic patients newly diagnosed with CKD, those with EDN will be identified and located by telephone to complete a total of 275 subjects over 18 years of age. Subsequently, they will be cited in the office of Biomedical Unit 02, will verify that they meet the selection criteria, will be informed about the objectives of the study and invited to participate. Those who agree to participate will be given an informed consent letter, they will be asked to read it carefully and if they have any doubts, they will be clarified at the moment. Once they have signed the written consent they will be cited for the first blood sample collecting (5 mL) to be used for genomic DNA extraction and genotyping for the rs35652124 polymorphism. All patients entering the study will undergo a physical and dietary examination and will record the data on a clinical record card. They will be prescribed a meal plan according to ADA recommendations and K/DOQI guidelines two weeks prior (week <2) at the start of the clinical trial, which will be maintained throughout the follow-up. They will then be scheduled monthly for medical and nutritional assessment. At the visits of weeks 2, 0 (start of supplementation), 12, and 24, three peripheral blood tubes (5 mL each) will be drawn. The first, to extract total mRNA and expression analysis of the NFE2L2 gene, the second, to determine the levels of NRF2, SOD, GPx and HO1 and the third, to perform renal function tests and control of possible confounding variables (creatinine, glucose, glycosylated hemoglobin, lipid profile and uric acid). In addition, they will be asked to collect a sample of the first morning urine to quantify albuminuria/creatinuria on the same day that blood samples were taken. The time of the study since the first evaluation is 26 weeks and the total number of medical and nutrition visits will be six, one monthly. Genotyping will be performed by polymerase chain reaction (PCR) coupled to four pairs of oligonucleotide primers specific for the alleles of interest. The gene expression assay will be performed by real-time PCR, while the determination of the concentrations of NRF2, SOD, GPx and HO1 will be carried out by the ELISA method with kits designed for this purpose. The analysis of the data includes descriptive statistics expressed in averages and standard or median deviations according to the parametric or non-parametric distribution, the nominal variables will be presented as numbers or percentages and the comparison between these will be by Chi square or Fisher exact. Inferential statistics included U-Mann Whitney or Student t tests for independent and paired samples as appropriate to evaluate the NRF2, SOD, GPx and HO1 concentrations with the different interventions and the individuals in the control group. A covariance analysis will be performed taking into consideration the factor supplementation, genetic factor and the interaction of both with the concentrations of NRF2. A value of p<0.05 and 95% CI will be considered significant.

Resources and infrastructure. The CIBO and the Medical Research Unit in Renal Diseases have the human resources to coordinate and develop the present research. Also, they have the necessary infrastructure and equipment to carry out the procedures contemplated in this project. The project will be submitted to calls for funding to obtain the necessary resources for its development.

Study Type

Interventional

Enrollment (Anticipated)

176

Phase

  • Phase 2
  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years to 90 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • With T2DM according to the American Diabetes Association
  • With any time of T2DM evolution
  • With CKD stage 1-3a according to the K/DIGO guidelines

Exclusion Criteria:

  • Incomplete evaluations
  • That they have not been attached to the assigned intervention with an established frequency of <80%
  • Decide to withdraw from the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Curcumin/NFE2L2 A>G
Patients in Experimental group 1 and 2 will receive 800 mg/day of curcumin (for which a bioavailability of about 90% has been demonstrated and greater than other curcuminoids, administered in two doses of 400 mg each (the presentation will be in capsules containing 400 mg of THC).
Combination product: Curcumin/NFE2L2 A>G
The administration will be orally and the patient will be instructed to take two capsules per day for one week, one in the morning 15 minutes before breakfast and another at night 15 minutes before dinner, accompanied by a cup of 240 mL of pure water. It will be indicated to continue with their usual medical treatment.
Other Names:
  • Curcumin group
Placebo Comparator: Placebo/NFE2L2 A>G
Patients in control group 1 and 2, the placebo intervention will consist of administering sucralose capsules (a substance lacking pharmacological action, with no active principle and a lower intake of glucose compared to sucrose). Patients will receive 300 mg/day of sucralose distributed in two doses of 150 mg each.
Combination product: Placebo/NFE2L2 A>G
The administration will be orally and the patient will be instructed to take two capsules for 24 weeks, one in the morning 15 minutes before breakfast and another in the evening 15 minutes before dinner, accompanied by a 240 mL cup of pure water. They will be advised to continue their usual medical treatment.
Other Names:
  • Placebo group

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Change from Baseline expression Gen NFE2L2 at 3 months
Time Frame: Baseline at 3 months
mRNA and active protein NRF2
Baseline at 3 months
Change from Baseline expression Gen NFE2L2 at 6 months
Time Frame: Baseline at 6 months
mRNA and active protein NRF2
Baseline at 6 months
Change from Antioxidant capacity at 3 months
Time Frame: Baseline at 3 months
Superoxide dismutase, hemoxygenase 1, Glutathion peroxidase using the ELISA technique
Baseline at 3 months
Change from Antioxidant capacity at 6 months
Time Frame: Baseline at 6 months
Superoxide dismutase, hemoxygenase 1, Glutathion peroxidase using the ELISA technique
Baseline at 6 months
Change from Renal Function at 3 months
Time Frame: Baseline at 3 months
Glomerular Filtration Rate (Serum creatinine) and Albuminuria (Albumin/Creatinine Ratio)
Baseline at 3 months
Change from Renal Function at 6 months
Time Frame: Baseline at 6 months
Glomerular Filtration Rate (Serum creatinine) and Albuminuria (Albumin/Creatinine Ratio)
Baseline at 6 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Unidad de Investigacion Medica en Enfermedades Renales

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Anticipated)

August 1, 2018

Primary Completion (Anticipated)

February 28, 2019

Study Completion (Anticipated)

April 30, 2019

Study Registration Dates

First Submitted

August 18, 2017

First Submitted That Met QC Criteria

August 21, 2017

First Posted (Actual)

August 25, 2017

Study Record Updates

Last Update Posted (Actual)

May 30, 2018

Last Update Submitted That Met QC Criteria

May 28, 2018

Last Verified

September 1, 2017

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • UIMER002

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

Undecided

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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