Clinical trial NCT03262363: Curcumin on NFE2L2 Gene Expression, Antioxidant Capacity and Renal Function According to rs35652124 in Diabetic Nephropathy
Official title: Interaction of Polymorphism rs35652124 With Curcumin Supplementation on NFE2L2 Gene Expression, Antioxidant Capacity and Renal Function in Patients With Early Diabetic Nephropathy
Study type: INTERVENTIONAL
Overall status: UNKNOWN
Phase: PHASE2
PHASE3
Conditions: Chronic Kidney Diseases
Diabetes Mellitus, Type 2
Polymorphism
Keywords: nutrigenomics
Diet-gene interaction,
Curcumin,
Antioxidants,
Human NFE2L2 protein,
Polymorphism,
Diabetes,
Chronic kidney disease
Lead sponsor: Unidad de Investigacion Medica en Enfermedades Renales
Sponsor class: OTHER
First posted: 2017-08-25
Enrollment: 176
Sex: ALL
Minimum age (years): 18
Maximum age (years): 90
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Intervention model description: The study starts from the classification of patients according to the genotype for the rs35652124 polymorphism (-653G\>A) of the NFE2L2 gene. Two Experimental groups and two Control groups will be formed according to the following:

Experimental group 1: Diabetic patients with early CKD homozygous for the -653G (G/G) allele of the NFE2L2 gene that will receive curcumin.

Experimental group 2: Diabetic patients with early CKD carrying the allele -653A (G/A or A/A) of the NFE2L2 gene that will receive curcumin.

Control group 1: Diabetic patients with early CKD homozygous for the -653G (G/G) allele of the NFE2L2 gene receiving placebo.

Control group 2: Diabetic patients with early CKD carrying the allele -653A (G/A or A/A) of the NFE2L2 gene who will receive placebo.
Primary purpose: TREATMENT

Brief summary: 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.

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.

Eligibility criteria: 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

Primary outcomes:
measure: Change from Baseline expression Gen NFE2L2 at 3 months
timeFrame: Baseline at 3 months
measure: Change from Baseline expression Gen NFE2L2 at 6 months
timeFrame: Baseline at 6 months
measure: Change from Antioxidant capacity at 3 months
timeFrame: Baseline at 3 months
measure: Change from Antioxidant capacity at 6 months
timeFrame: Baseline at 6 months
measure: Change from Renal Function at 3 months
timeFrame: Baseline at 3 months
measure: Change from Renal Function at 6 months
timeFrame: Baseline at 6 months
Secondary outcomes:
Other outcomes:
Locations:
city: Guadalajara
country: Mexico
facility: Umae Hospital de Especialidades
state: Jalisco
Study officials:
References:
citation: United States Renal Data Sytem. 2016 USRDS annual data report: Epidemiology of kidney disease in the United States. National Institutes of Health, National Institute of Diabetes and Digestive and Kidney Diseases. Bethesda, MD, 2016.
citation: Gutiérrez JP, Rivera Dommarco J, Shamah Levy T, et al. Encuesta Nacional de Salud y Nutrición 2012. Resultados Nacionales. Cuernavaca, México: Salud Publica Mex; 2012.
citation: Hernández Ávila M, Gutiérrez JP, editores. Diabetes mellitus: la urgencia de reforzar la respuesta en políticas públicas para su prevención y control. Cuernavaca, México: Salud Publica Mex; 2012.
citation: Asociación Latinoamericana de Diabetes (ALAD). Guías ALAD sobre el diagnóstico, control y tratamiento de la diabetes mellitus Tipo 2 con medicina basada en evidencia. 1a ed. Latinoamérica: ALAD; 2013.
citation: Hernández Ávila M, Rivera Dommarco J, Shamah Levy T. Encuesta Nacional de Salud y Nutrición 2016. Resultados Nacionales. Cuernavaca, México: Instituto Nacional de Salud Pública (MX), 2016.
citation: Cueto Manzano AM, Cortés Sanabria L, Martínez Ramírez HR, et al. Enfermedad Renal Crónica Temprana: Prevención, diagnóstico y tratamiento. México: Médica Panamericana; 2013. pp. 250.
citation: Wolf G. New insights into the pathophysiology of diabetic nephropathy: from haemodynamics to molecular pathology. Eur J Clin Invest. 2004 Dec;34(12):785-96. doi: 10.1111/j.1365-2362.2004.01429.x.
citation: Navarro JF, Milena FJ, Mora C, Leon C, Garcia J. Renal pro-inflammatory cytokine gene expression in diabetic nephropathy: effect of angiotensin-converting enzyme inhibition and pentoxifylline administration. Am J Nephrol. 2006;26(6):562-70. doi: 10.1159/000098004. Epub 2006 Dec 13.
citation: Uruno A, Furusawa Y, Yagishita Y, Fukutomi T, Muramatsu H, Negishi T, Sugawara A, Kensler TW, Yamamoto M. The Keap1-Nrf2 system prevents onset of diabetes mellitus. Mol Cell Biol. 2013 Aug;33(15):2996-3010. doi: 10.1128/MCB.00225-13. Epub 2013 May 28.
citation: Gómez García EF, Martínez Ramírez HR, Cortés Sanabria L, et al. Cambios y mejoras en la calidad de la dieta en pacientes con enfermedad renal crónica temprana. En: Conferencia dentro del marco del XLVII Congreso Nacional de Nefrología; 2013 Sep 4-12; Guadalajara, Jalisco. México.
citation: Balagopal P, George D, Patton N, Yarandi H, Roberts WL, Bayne E, Gidding S. Lifestyle-only intervention attenuates the inflammatory state associated with obesity: a randomized controlled study in adolescents. J Pediatr. 2005 Mar;146(3):342-8. doi: 10.1016/j.jpeds.2004.11.033.
citation: Ruiz S, Pergola PE, Zager RA, Vaziri ND. Targeting the transcription factor Nrf2 to ameliorate oxidative stress and inflammation in chronic kidney disease. Kidney Int. 2013 Jun;83(6):1029-41. doi: 10.1038/ki.2012.439. Epub 2013 Jan 16.
citation: Yoh K, Hirayama A, Ishizaki K, Yamada A, Takeuchi M, Yamagishi S, Morito N, Nakano T, Ojima M, Shimohata H, Itoh K, Takahashi S, Yamamoto M. Hyperglycemia induces oxidative and nitrosative stress and increases renal functional impairment in Nrf2-deficient mice. Genes Cells. 2008 Nov;13(11):1159-70. doi: 10.1111/j.1365-2443.2008.01234.x.
citation: Choi BH, Kang KS, Kwak MK. Effect of redox modulating NRF2 activators on chronic kidney disease. Molecules. 2014 Aug 20;19(8):12727-59. doi: 10.3390/molecules190812727.
citation: Atul A and Lakhwinder S. Pathogenesis of diabetic nephropathy and potential therapeutic effect of curcumin: A Review. Int J Pharm Bio Sci 2013;4:79-87.