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N-Acetylcysteine and Milk Thistle for Treatment of Diabetic Nephropathy

Primary Purpose

Diabetic Nephropathies, Proteinuria, Oxidative Stress

Status
Completed
Phase
Phase 2
Locations
United States
Study Type
Interventional
Intervention
N-acetylcysteine
silibin
high-dose silibin
N-acetylcysteine placebo
silibin placebo
Sponsored by
The University of Texas Health Science Center at San Antonio
About
Eligibility
Locations
Arms
Outcomes
Full info

About this trial

This is an interventional treatment trial for Diabetic Nephropathies focused on measuring Diabetic Nephropathies, Proteinuria, Renal Insufficiency, Chronic, Monocytes, Oxidative stress, Inflammation, Antioxidants, Glutathione, Silymarin, Acetylcysteine, Dietary Supplements, Complementary Therapies

Eligibility Criteria

18 Years - 70 Years (Adult, Older Adult)All SexesDoes not accept healthy volunteers

Inclusion Criteria:

  • Males or females, age 18-70 years old.
  • Type 2 diabetes mellitus
  • Diabetic nephropathy, as defined by:

    • estimated GFR between 60 and 15 ml/min,
    • presence of proteinuria.
  • Current medical treatment with low dose aspirin
  • Treatment of hypertension with (but not limited to) one diuretic, one beta- blocker and one medication from the classes ARBs or ACE inhibitors.
  • Treatment of hyperglycemia with (but not limited to) glipizide and the medication class insulin.
  • Treatment of hypercholesterolemia with (but not limited to) one medication from the class statins.

Exclusion Criteria:

  • Type 1 diabetes mellitus.
  • Glycosylated hemoglobin (HbA1C) > 10%
  • >20% variation in estimated GFR, during last 6 months
  • SBP >170 mmHg or DBP >100 mmHg on medications
  • Other secondary forms of hypertension (endocrine, renovascular)
  • History of intolerance to:

    • Both ACE-I and ARBs;
    • The investigational supplements;
    • Iodinated radiologic contrast material.
  • Known non diabetic renal disease, or history of solid organ transplantation.
  • Hepatitis virus or Human Immunodeficiency virus infections
  • Use of one of the following medications within 2 months prior to enrollment in the study:

    • Metformin.
    • Thiazolidinediones (pioglitazone or rosiglitazone);
    • Prescription-grade vitamin E, vitamin C, systemic steroids, and/or non-steroidal anti-inflammatory agents;
    • Over-the-counter vitamin E, vitamin C, and/or non-steroidal anti-inflammatory agents.
    • Over-the-counter antioxidants supplements including: Lipoic acid, Coenzyme Q10, N-acetyl-cysteine (NAC), Glutathione (GSH), Chromium, Fish-oil extracts (omega-3 fatty acids), Soy extracts (isoflavones), Milk thistle extract (silymarin), Green-tea preparations, Pomegranate extracts, Grape extracts, and Prickly pear extract.
  • Active coronary artery disease or cerebral vascular disease within 3 months prior to signing the informed consent.
  • Hepatic dysfunction as defined by abnormal total bilirubin or liver enzymes (ALT, AST) >2 times upper limit of normal range.
  • Active malignancy.
  • History of drug or alcohol dependency.
  • Psychiatric or neurological condition, preventing aware consent to the study and/or adherence to the study protocol
  • Unwillingness to practice birth control throughout the study.
  • Participation to another clinical study within 1 month prior to signing the informed consent form.
  • Planned move to outside the study area, surgery or radiographic studies utilizing iodine-based contrast material within the next one year

Sites / Locations

  • University of Texas Hlth Sci Ctr San Ant

Arms of the Study

Arm 1

Arm 2

Arm 3

Arm 4

Arm 5

Arm Type

Placebo Comparator

Experimental

Experimental

Experimental

Experimental

Arm Label

Placebo

N-acetylcysteine

silibin

N-acetycysteine + silibin

N-acetylcysteine + high-dose silibin

Arm Description

N-acetylcysteine placebo + silibin placebo

N-acetylcysteine active + silibin placebo

N-acetylcysteine placebo + silibin active

N-acetylcysteine active + silibin active

N-acetylcysteine active + high-dose silibin active

Outcomes

Primary Outcome Measures

Urinary Albumin excretion

Secondary Outcome Measures

urinary alpha-1 microglobulin excretion
urinary C-C-chemokines excretion
peripheral blood monocyte glutathione content
tolerance and safety

Full Information

First Posted
June 2, 2009
Last Updated
June 23, 2016
Sponsor
The University of Texas Health Science Center at San Antonio
Collaborators
National Center for Complementary and Integrative Health (NCCIH), VA Office of Research and Development
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1. Study Identification

Unique Protocol Identification Number
NCT00915200
Brief Title
N-Acetylcysteine and Milk Thistle for Treatment of Diabetic Nephropathy
Official Title
N-Acetylcysteine and Milk Thistle for Treatment of Diabetic Nephropathy.
Study Type
Interventional

2. Study Status

Record Verification Date
June 2016
Overall Recruitment Status
Completed
Study Start Date
October 2009 (undefined)
Primary Completion Date
April 2016 (Actual)
Study Completion Date
April 2016 (Actual)

3. Sponsor/Collaborators

Responsible Party, by Official Title
Sponsor
Name of the Sponsor
The University of Texas Health Science Center at San Antonio
Collaborators
National Center for Complementary and Integrative Health (NCCIH), VA Office of Research and Development

4. Oversight

Data Monitoring Committee
Yes

5. Study Description

Brief Summary
The study is designed to test if the combination of two potent antioxidant nutritional supplements, N-acetylcysteine and the milk thistle extract silibin, is capable of correcting the shedding of urine protein, the oxidative stress, and the inflammation in patients with type 2 diabetes mellitus and diabetic kidney disease.
Detailed Description
Oxidative stress and GSH imbalance are major contributors to the pathogenesis of diabetic nephropathy. Current options for the treatment of oxidative stress in diabetic nephropathy are limited and only partially effective, thus interest in the development of new strategies is high. The study intends to test the hypothesis that combined oral supplementation of the antioxidants N-acetylcysteine (NAC) and milk thistle flavonolignan silibin (as silibin-phosphatidylcholine) will reduce proteinuria and urinary and systemic manifestations of oxidative stress and inflammation, which are characteristically observed in patients with type 2 diabetes mellitus and related nephropathy. We expect these effects to be achieved with minimal or no side effects, and with good patient tolerance. The trial is designed as a two-center, double-blind, placebo-controlled, randomized, modified-factorial dose-ranging design, five-arm pilot study in patients with Type 2 diabetes mellitus and advanced diabetic nephropathy with proteinuria. Intervention consists of three-month oral administration of NAC, silibin, and/or respective placebos for three months. Subjects are randomized to the following five intervention arms: (A) placebo; (B) NAC; (C) silibin; (D) NAC + silibin; and (E) NAC + double-dose silibin. The primary outcome measure is urinary excretion of albumin, a marker of glomerular injury. Secondary outcome measures are alpha-1 microglobulin, a marker of tubular injury, and urinary excretion of inflammatory cytokines and C-C chemokines, i.e. markers of renal inflammation. In addition, peripheral blood monocytes from the same patients are analyzed for glutathione (GSH) content and activity of GSH metabolizing enzymes. All outcome measures are monitored in relation to both treatment allocation and prevalent blood and urine levels of the active treatment. Safety and tolerability of this combination treatment are monitored throughout the trial.

6. Conditions and Keywords

Primary Disease or Condition Being Studied in the Trial, or the Focus of the Study
Diabetic Nephropathies, Proteinuria, Oxidative Stress
Keywords
Diabetic Nephropathies, Proteinuria, Renal Insufficiency, Chronic, Monocytes, Oxidative stress, Inflammation, Antioxidants, Glutathione, Silymarin, Acetylcysteine, Dietary Supplements, Complementary Therapies

7. Study Design

Primary Purpose
Treatment
Study Phase
Phase 2
Interventional Study Model
Parallel Assignment
Masking
ParticipantCare ProviderInvestigatorOutcomes Assessor
Allocation
Randomized
Enrollment
114 (Actual)

8. Arms, Groups, and Interventions

Arm Title
Placebo
Arm Type
Placebo Comparator
Arm Description
N-acetylcysteine placebo + silibin placebo
Arm Title
N-acetylcysteine
Arm Type
Experimental
Arm Description
N-acetylcysteine active + silibin placebo
Arm Title
silibin
Arm Type
Experimental
Arm Description
N-acetylcysteine placebo + silibin active
Arm Title
N-acetycysteine + silibin
Arm Type
Experimental
Arm Description
N-acetylcysteine active + silibin active
Arm Title
N-acetylcysteine + high-dose silibin
Arm Type
Experimental
Arm Description
N-acetylcysteine active + high-dose silibin active
Intervention Type
Dietary Supplement
Intervention Name(s)
N-acetylcysteine
Other Intervention Name(s)
NAC
Intervention Description
600 mg orally twice daily for three months
Intervention Type
Dietary Supplement
Intervention Name(s)
silibin
Other Intervention Name(s)
silibin-phosphatidylcholine, Siliphos
Intervention Description
480 mg orally twice daily for three months
Intervention Type
Dietary Supplement
Intervention Name(s)
high-dose silibin
Other Intervention Name(s)
silibin-phosphatidylcholine, Siliphos
Intervention Description
960 mg orally twice daily for three months
Intervention Type
Dietary Supplement
Intervention Name(s)
N-acetylcysteine placebo
Other Intervention Name(s)
NAC placebo
Intervention Description
excipient orally twice daily for three months
Intervention Type
Dietary Supplement
Intervention Name(s)
silibin placebo
Other Intervention Name(s)
silibin-phosphatidylcholine placebo, Siliphos placebo
Intervention Description
excipient orally twice daily for three months
Primary Outcome Measure Information:
Title
Urinary Albumin excretion
Time Frame
3-month
Secondary Outcome Measure Information:
Title
urinary alpha-1 microglobulin excretion
Time Frame
3-month
Title
urinary C-C-chemokines excretion
Time Frame
3-month
Title
peripheral blood monocyte glutathione content
Time Frame
3-month
Title
tolerance and safety
Time Frame
3-month

10. Eligibility

Sex
All
Minimum Age & Unit of Time
18 Years
Maximum Age & Unit of Time
70 Years
Accepts Healthy Volunteers
No
Eligibility Criteria
Inclusion Criteria: Males or females, age 18-70 years old. Type 2 diabetes mellitus Diabetic nephropathy, as defined by: estimated GFR between 60 and 15 ml/min, presence of proteinuria. Current medical treatment with low dose aspirin Treatment of hypertension with (but not limited to) one diuretic, one beta- blocker and one medication from the classes ARBs or ACE inhibitors. Treatment of hyperglycemia with (but not limited to) glipizide and the medication class insulin. Treatment of hypercholesterolemia with (but not limited to) one medication from the class statins. Exclusion Criteria: Type 1 diabetes mellitus. Glycosylated hemoglobin (HbA1C) > 10% >20% variation in estimated GFR, during last 6 months SBP >170 mmHg or DBP >100 mmHg on medications Other secondary forms of hypertension (endocrine, renovascular) History of intolerance to: Both ACE-I and ARBs; The investigational supplements; Iodinated radiologic contrast material. Known non diabetic renal disease, or history of solid organ transplantation. Hepatitis virus or Human Immunodeficiency virus infections Use of one of the following medications within 2 months prior to enrollment in the study: Metformin. Thiazolidinediones (pioglitazone or rosiglitazone); Prescription-grade vitamin E, vitamin C, systemic steroids, and/or non-steroidal anti-inflammatory agents; Over-the-counter vitamin E, vitamin C, and/or non-steroidal anti-inflammatory agents. Over-the-counter antioxidants supplements including: Lipoic acid, Coenzyme Q10, N-acetyl-cysteine (NAC), Glutathione (GSH), Chromium, Fish-oil extracts (omega-3 fatty acids), Soy extracts (isoflavones), Milk thistle extract (silymarin), Green-tea preparations, Pomegranate extracts, Grape extracts, and Prickly pear extract. Active coronary artery disease or cerebral vascular disease within 3 months prior to signing the informed consent. Hepatic dysfunction as defined by abnormal total bilirubin or liver enzymes (ALT, AST) >2 times upper limit of normal range. Active malignancy. History of drug or alcohol dependency. Psychiatric or neurological condition, preventing aware consent to the study and/or adherence to the study protocol Unwillingness to practice birth control throughout the study. Participation to another clinical study within 1 month prior to signing the informed consent form. Planned move to outside the study area, surgery or radiographic studies utilizing iodine-based contrast material within the next one year
Overall Study Officials:
First Name & Middle Initial & Last Name & Degree
Paolo Fanti, M.D.
Organizational Affiliation
University of Texas
Official's Role
Principal Investigator
Facility Information:
Facility Name
University of Texas Hlth Sci Ctr San Ant
City
San Antonio
State/Province
Texas
ZIP/Postal Code
78229
Country
United States

12. IPD Sharing Statement

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N-Acetylcysteine and Milk Thistle for Treatment of Diabetic Nephropathy

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