Nitric Oxide (NO) Activity and Diabetic Nephropathy

NCT00136188 | Completed Phase 2

• 1 other identifier: SFB 423 TP B5
• Study Type: interventional
• Target: 100
• Locations: 1 country
• Sites: 1

Brief Summary

Experimental data suggest that oxidative stress and endothelial dysfunction are key players in the pathogenesis of diabetic nephropathy. In the last few years the investigators were able to establish a method to assess endothelial function of the renal vasculature in humans and started to systematically study a variety of cardiovascular disorders known to be associated with endothelial dysfunction in other vascular beds, including hypertension, hypercholesterolemia and type-2 diabetes. In patients with type-2 diabetes the investigators could demonstrate that despite unaltered basal and stimulated NO-activity, the renal response to the antioxidant vitamin C was more pronounced compared to control subjects. These data suggest that oxidative stress is increased in the renal vasculature of diabetic patients. Furthermore, NO-activity in diabetic patients appears to be upregulated to compensate for the increase in oxidative stress. This hypothesis is supported by the demonstration of increased endothelial nitric oxide synthase (eNOS) expression in kidney biopsies of diabetic patients. The major focus of the investigators' current research activities is to assess the role of endothelial dysfunction in the very early stages of diabetic nephropathy. To this end, patients with increased fasting glucose or metabolic syndrome will be studied in comparison with an age-matched control group. Endothelial function and the role of oxidative stress will be assessed in the renal vasculature in all groups. In parallel, the investigators will study endothelial function in the forearm by venous occlusion plethysmography and in the retinal vasculature by scanning laser doppler flowmetry to dissect regional differences in the regulation of endothelial function. Further aspects include the role of microalbuminuria, glomerular hyperfiltration, and endogenous inhibitors of NO synthase such as NG,NG-Dimethyl-L-Arginine (ADMA). In a therapeutic approach, the investigators will determine the effects of various antioxidant treatment strategies on endothelial function and their potential role in the prevention of diabetic nephropathy.

Conditions

Diabetic Nephropathies

Keywords

Prediabetes; Metabolic Syndrome; Healthy Controls; Endothelial function

Outcome Measures

Primary Outcomes (1)

• Change in renal endothelial function

  4 weeks

Interventions

Folic Acid DRUG

oral administration of folic acid 5mg /d for 4 weeks

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Male and female patients aged 18-65 with diabetes, prediabetes or metabolic syndrome
• Male and female healthy control subjects aged 18-65

You may not qualify if:

• Advanced damage of vital organs (grade III and IV retinopathy)
• Therapy with a not approved concomitant medication in the last 4 weeks prior to intake of the first trial medication, especially lipid lowering and antidiabetic medications (washout phase)
• Blood donation within the last 4 weeks
• Patients with arterial fibrillation or atrioventricular (AV)-block (II and more)
• Patients with anamnestic myocardial infarct
• Patients with depression
• Patients with seizure disorders
• Patients with unstable angina pectoris including electrocardiogram (ECG)-aberrations or cardiac insufficiency New York Heart Association (NYHA) Stadium III and IV
• History of a malignant illness with the exception of those patients who have recovered for more than 10 years or have a basalioma of the skin.
• Actual or anamnestic alcohol or drug abuse
• History of organ transplant
• Anaphylaxis or known therapy resistance to any of the used test matters.
• Therapy with a not approved concomitant therapy
• Illnesses, which can influence the pharmacodynamics or pharmacokinetics of the test substance
• Liver or kidney diseases; SGOT, GPT, γ-GT, AP, bilirubin and creatinine above 200% of standard

Sponsors & Collaborators

• University of Erlangen-Nürnberg Medical School: lead

Study Sites (1)

CRC, Medizinische Klnik 4 - Nephrology and Hypertension, Uni Erlangen-Nürnberg

Erlangen, 91054, Germany

Location

Related Publications (2)

• Kannenkeril D, Bosch A, Harazny J, Karg M, Jung S, Ott C, Schmieder RE. Early vascular parameters in the micro- and macrocirculation in type 2 diabetes. Cardiovasc Diabetol. 2018 Sep 19;17(1):128. doi: 10.1186/s12933-018-0770-4.

  PMID: 30231923 DERIVED

• Ott C, Schneider MP, Delles C, Schlaich MP, Schmieder RE. Reduction in basal nitric oxide activity causes albuminuria. Diabetes. 2011 Feb;60(2):572-6. doi: 10.2337/db09-1630.

  PMID: 21270268 DERIVED

MeSH Terms

Conditions

Diabetic Nephropathies; Prediabetic State; Metabolic Syndrome

Interventions

Folic Acid

Condition Hierarchy (Ancestors)

Kidney Diseases; Urologic Diseases; Female Urogenital Diseases; Female Urogenital Diseases and Pregnancy Complications; Urogenital Diseases; Male Urogenital Diseases; Diabetes Complications; Diabetes Mellitus; Endocrine System Diseases; Glucose Metabolism Disorders; Metabolic Diseases; Nutritional and Metabolic Diseases; Insulin Resistance; Hyperinsulinism

Intervention Hierarchy (Ancestors)

Pterins; Pteridines; Heterocyclic Compounds, 2-Ring; Heterocyclic Compounds, Fused-Ring; Heterocyclic Compounds

Study Officials

• Roland E Schmieder, MD

  CRC, Medizinische Klnik 4 - Nephrology and Hypertension, Uni Erlangen-Nürnberg

  PRINCIPAL INVESTIGATOR

• Markus P Schlaich, MD

  CRC, Medizinische Klnik 4 - Nephrology and Hypertension, Uni Erlangen-Nürnberg

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: NA
• Masking: DOUBLE
• Who Masked: PARTICIPANT, INVESTIGATOR
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: August 25, 2005
• First Posted: August 26, 2005
• Study Start: August 1, 2009
• Primary Completion: December 1, 2011
• Study Completion: December 1, 2011
• Last Updated: June 19, 2012

Record last verified: 2012-06

Locations

DE (1)