Effect of Vitamin E on Non-Alcoholic Fatty Liver Disease
| Status: | Completed |
|---|---|
| Conditions: | Healthy Studies, Gastrointestinal, Gastrointestinal |
| Therapuetic Areas: | Gastroenterology, Other |
| Healthy: | No |
| Age Range: | 18 - 65 |
| Updated: | 11/18/2018 |
| Start Date: | December 2009 |
| End Date: | December 2016 |
Role of Mitochondrial Dysfunction in Non-Alcoholic Fatty Liver Disease
One-third of the US population has non-alcoholic fatty liver disease (NAFLD) due to obesity
and ~8 million of these individuals have a progressive form of the disease, non-alcoholic
steatohepatitis (NASH). Currently, there are no noninvasive ways to determine which
individuals with NAFLD will develop NASH. This is of medical importance since NASH can be a
prelude to the development of end-stage liver disease.
The study of NAFLD has been limited by several factors, including the difficulties associated
with studying liver metabolism in vivo in humans. Our group has pioneered new methods that
use nuclear magnetic resonance (NMR) to measure intermediary hepatic metabolism in humans
with a goal of directly studying the pathophysiology of bland steatosis and NASH. In this
study, these noninvasive methods will be used to characterize and compare the metabolic
alterations that accompany bland steatosis and NASH and test the hypothesis that detects if
hepatic mitochondrial metabolism contribute to both disorders. Such characterization is
fundamental to establishing a rational approach to the prevention and treatment of NAFLD and
may provide simple, non-invasive methods to differentiate benign and progressive forms of
NAFLD.
This proposal will be addressed via separate isotopic studies occurring at different time
points during a prolonged fast. In subjects with NAFLD, these studies will be carried out
before and after treatment with Vitamin E or placebo.
Healthy subjects will participate in initial baseline studies only without Vitamin E or
placebo intervention.
The study is designed to harness the physiologic changes that occur with short- and long-term
fasting to provide a rapid and cost-effective method to accomplish the aims of the
application.
and ~8 million of these individuals have a progressive form of the disease, non-alcoholic
steatohepatitis (NASH). Currently, there are no noninvasive ways to determine which
individuals with NAFLD will develop NASH. This is of medical importance since NASH can be a
prelude to the development of end-stage liver disease.
The study of NAFLD has been limited by several factors, including the difficulties associated
with studying liver metabolism in vivo in humans. Our group has pioneered new methods that
use nuclear magnetic resonance (NMR) to measure intermediary hepatic metabolism in humans
with a goal of directly studying the pathophysiology of bland steatosis and NASH. In this
study, these noninvasive methods will be used to characterize and compare the metabolic
alterations that accompany bland steatosis and NASH and test the hypothesis that detects if
hepatic mitochondrial metabolism contribute to both disorders. Such characterization is
fundamental to establishing a rational approach to the prevention and treatment of NAFLD and
may provide simple, non-invasive methods to differentiate benign and progressive forms of
NAFLD.
This proposal will be addressed via separate isotopic studies occurring at different time
points during a prolonged fast. In subjects with NAFLD, these studies will be carried out
before and after treatment with Vitamin E or placebo.
Healthy subjects will participate in initial baseline studies only without Vitamin E or
placebo intervention.
The study is designed to harness the physiologic changes that occur with short- and long-term
fasting to provide a rapid and cost-effective method to accomplish the aims of the
application.
Study Procedures (Healthy and NAFLD/NASH Subjects) Screening (Week -2) Prior to initiation of
the timeline, all potential study participants will be evaluated by a research nurse to
obtain informed consent, a brief medical history, height, weight, body mass index, waist/hip
circumference, vital signs, approximately 20mls. of blood for screening labs and urine for
analysis. NAFLD/NASH subjects with no available liver serologies will have an additional 25
mls of blood drawn. This visit will take approximately 60 minutes and will include a
screening questionnaire for family history of disease, activities of daily living (ADL), and
alcohol consumption. Diabetic subjects will also withhold their oral diabetic agent prior to
the fasting screening labwork.
Teaching Visit: (Week -2 or prior to week -1): A research nurse will give diabetic subjects a
30-minute refresher course on diabetes that will include the signs and symptoms of hyper and
hypoglycemia. A teaching booklet will be given to each diabetic subject. Some type 2 diabetic
(T2DM) patients only on oral medication do not regularly check their blood sugar. If the
patient does not have a glucometer, we will provide a glucometer, supplies and instructions
for use by our diabetic study volunteers during their study participation.
Prior to the initiation of standardized diet, subjects will maintain their normal dietary
routine. For three to four days prior to the protocol procedures, subjects will be placed on
a standardized diet provided by the CTRC metabolic kitchen. In addition, participants will
refrain from physical exercise at least 3 days prior to the procedures. Also, T2DM
participants will withhold their oral diabetic agents for 3-4 days prior to the protocol
procedures.
Phenotyping (Week -1) Participants will be asked to write down food and beverage consumption
for three days prior to this visit. This food log will be turned into the dietician at the
Clinical Translational Research Center (CTRC) for calculation of proteins, carbohydrates and
fats in order to calculate a tailored 3.5 day meal plan to be consumed just prior to the
overnight Fast.
Participants will be asked not to eat or drink anything after midnight prior to this visit in
preparation for the day's study procedures.
Diabetic participants will withhold their oral diabetic agents for 3 days prior to the
Phenotyping visit and the day of the visit. During this time, they will be instructed to
check their blood glucose 30 minutes prior to each meal and at bedtime daily and will notify
the research nurse or study physician if their blood glucose level is below 70 mg/dl or above
250 mg/dl.
Participants will arrive at the Advanced Imaging Research Center (AIRC) at approximately 8:30
AM. During the morning, participants will have measurements of liver fat in the 3 Tesla (3T)
Magnetic Resonance (MR) scanner and measurement of their respiratory quotient (RQ) using an
indirect calorimeter. Immediately following the scan, two intravenous catheters will be
placed in preparation for the insulin/clamp study: an antecubital vein catheter to infuse
dextrose and insulin and a dorsal hand vein catheter for blood sampling. The hand will be
kept in a hot box at 70 °C for arterialization of venous blood. Three 10 ml. blood draws will
be obtained for the baseline glucose level measurement, insulin infusate preparation, and
blood chemistry analysis. At approximately 11:30 A.M., a primed continuous infusion of
regular human insulin will be started for the duration of 2 hours. A 20% dextrose infusion
will be started after 4 minutes of insulin infusion and adjusted to maintain euglycemia. A
small amount of blood (1 ml.) will be drawn every 5 minutes for 2 hours to monitor plasma
glucose concentration. The total amount of blood required for the whole procedure is
approximately 80 mls. A urine specimen will be collected for determination of urinary glucose
losses in the post-absorptive state. Approximately 3 healthy volunteers will have an
additional measurement of liver fat after the insulin clamp to determine if changes are
evident from the test. The participant will then be given a meal and discharged from the
AIRC. The duration of this visit is approximately 7 hours.
Overnight Fast (Week 0) Diabetic participants will withhold their oral diabetic agents for 4
days prior to the Overnight Fast visit and the day of the visit. During this time, they will
be instructed to check their blood glucose 30 minutes prior to breakfast and at bedtime daily
and will notify the research nurse or study physician if their blood glucose level is below
70 mg/dl or above 250 mg/dl.
Four days prior to metabolic studies, participants will begin a tailored diet provided by the
CTRC metabolic kitchen. The day prior to fasting studies, all participants will have the
final meal at noon and begin fasting.
The following day they will arrive at the Advanced Imaging Research Center for a liver
Magnetic Resonance Spectroscopy (MRS). Deuterium oxide (a.k.a. heavy water), the first stable
isotope, will be administered according to the participant's weight in three divided doses.
Participants will receive carbon-13 labeled [U-13C]propionate (three 400 mg doses given by
mouth over 1 hour). During the study, subjects will also be given 0.5% heavy water ad
libitum. Subjects will undergo measurement of their respiratory quotient (RQ) using an
indirect calorimeter just prior to the infusion protocol. Subjects will then have an
intravenous catheter placed and an infusion of the stable isotopes carbon-13 labeled
[3,4-13C2]glucose, carbon-13 labeled [1,2-13C]acetoacetate and carbon-13 labeled
[3,4-13C]3-hydroxybutyrate initiated over two hours. During this period, 5 ml. blood draws
will occur every hour to determine plasma non-esterified fatty acids (NEFA), ketones,
glucose, insulin, and glucagon levels. At two hrs after initiation of the infusion, a 50 ml.
blood draw will be performed to obtain samples for spectroscopic determination of the rate of
ketogenesis and citrate oxidation in the citric acid (TCA) cycle. At the completion of study
procedures, the stable isotope infusion will be stopped and participants will be sent to the
CTRC outpatient clinic for Dual Energy x-Ray Absorptiometry (DEXA) to determine estimated
total body fat measurement. After the DEXA, healthy subjects will be discharged to home;
NAFLD subjects will be admitted to CTRC for liver biopsy, if needed.
The conclusion of the metabolic studies in week 0 marks the end of the study for control
subjects, while NAFLD subjects will be initiated on Vitamin E or placebo therapy at this time
point. All subjects will be given a meal and evaluated for stability (vital signs within
normal limits) prior to discharge to home. The total amount of blood collected for overnight
fasting studies will be less than 325 mls.
Follow-Up Visits (Weeks 4, 8, 12) Subjects will visit with the research nurse and/or Dr.
Browning to monitor compliance with the vitamin E/placebo regime. At each follow-up visit,
subjects will have blood collected (approximately 10mls.) per Table 1. Additionally, each
volunteer will have an MRS to measure liver triglyceride content.
Phenotype Visit (Week 16) This is a repeat of the phenotype visit at Week -1.
Overnight Fast (Week 17) This is a repeat of the overnight fast at Week 0. All procedures,
including the isotope studies will be the same.
the timeline, all potential study participants will be evaluated by a research nurse to
obtain informed consent, a brief medical history, height, weight, body mass index, waist/hip
circumference, vital signs, approximately 20mls. of blood for screening labs and urine for
analysis. NAFLD/NASH subjects with no available liver serologies will have an additional 25
mls of blood drawn. This visit will take approximately 60 minutes and will include a
screening questionnaire for family history of disease, activities of daily living (ADL), and
alcohol consumption. Diabetic subjects will also withhold their oral diabetic agent prior to
the fasting screening labwork.
Teaching Visit: (Week -2 or prior to week -1): A research nurse will give diabetic subjects a
30-minute refresher course on diabetes that will include the signs and symptoms of hyper and
hypoglycemia. A teaching booklet will be given to each diabetic subject. Some type 2 diabetic
(T2DM) patients only on oral medication do not regularly check their blood sugar. If the
patient does not have a glucometer, we will provide a glucometer, supplies and instructions
for use by our diabetic study volunteers during their study participation.
Prior to the initiation of standardized diet, subjects will maintain their normal dietary
routine. For three to four days prior to the protocol procedures, subjects will be placed on
a standardized diet provided by the CTRC metabolic kitchen. In addition, participants will
refrain from physical exercise at least 3 days prior to the procedures. Also, T2DM
participants will withhold their oral diabetic agents for 3-4 days prior to the protocol
procedures.
Phenotyping (Week -1) Participants will be asked to write down food and beverage consumption
for three days prior to this visit. This food log will be turned into the dietician at the
Clinical Translational Research Center (CTRC) for calculation of proteins, carbohydrates and
fats in order to calculate a tailored 3.5 day meal plan to be consumed just prior to the
overnight Fast.
Participants will be asked not to eat or drink anything after midnight prior to this visit in
preparation for the day's study procedures.
Diabetic participants will withhold their oral diabetic agents for 3 days prior to the
Phenotyping visit and the day of the visit. During this time, they will be instructed to
check their blood glucose 30 minutes prior to each meal and at bedtime daily and will notify
the research nurse or study physician if their blood glucose level is below 70 mg/dl or above
250 mg/dl.
Participants will arrive at the Advanced Imaging Research Center (AIRC) at approximately 8:30
AM. During the morning, participants will have measurements of liver fat in the 3 Tesla (3T)
Magnetic Resonance (MR) scanner and measurement of their respiratory quotient (RQ) using an
indirect calorimeter. Immediately following the scan, two intravenous catheters will be
placed in preparation for the insulin/clamp study: an antecubital vein catheter to infuse
dextrose and insulin and a dorsal hand vein catheter for blood sampling. The hand will be
kept in a hot box at 70 °C for arterialization of venous blood. Three 10 ml. blood draws will
be obtained for the baseline glucose level measurement, insulin infusate preparation, and
blood chemistry analysis. At approximately 11:30 A.M., a primed continuous infusion of
regular human insulin will be started for the duration of 2 hours. A 20% dextrose infusion
will be started after 4 minutes of insulin infusion and adjusted to maintain euglycemia. A
small amount of blood (1 ml.) will be drawn every 5 minutes for 2 hours to monitor plasma
glucose concentration. The total amount of blood required for the whole procedure is
approximately 80 mls. A urine specimen will be collected for determination of urinary glucose
losses in the post-absorptive state. Approximately 3 healthy volunteers will have an
additional measurement of liver fat after the insulin clamp to determine if changes are
evident from the test. The participant will then be given a meal and discharged from the
AIRC. The duration of this visit is approximately 7 hours.
Overnight Fast (Week 0) Diabetic participants will withhold their oral diabetic agents for 4
days prior to the Overnight Fast visit and the day of the visit. During this time, they will
be instructed to check their blood glucose 30 minutes prior to breakfast and at bedtime daily
and will notify the research nurse or study physician if their blood glucose level is below
70 mg/dl or above 250 mg/dl.
Four days prior to metabolic studies, participants will begin a tailored diet provided by the
CTRC metabolic kitchen. The day prior to fasting studies, all participants will have the
final meal at noon and begin fasting.
The following day they will arrive at the Advanced Imaging Research Center for a liver
Magnetic Resonance Spectroscopy (MRS). Deuterium oxide (a.k.a. heavy water), the first stable
isotope, will be administered according to the participant's weight in three divided doses.
Participants will receive carbon-13 labeled [U-13C]propionate (three 400 mg doses given by
mouth over 1 hour). During the study, subjects will also be given 0.5% heavy water ad
libitum. Subjects will undergo measurement of their respiratory quotient (RQ) using an
indirect calorimeter just prior to the infusion protocol. Subjects will then have an
intravenous catheter placed and an infusion of the stable isotopes carbon-13 labeled
[3,4-13C2]glucose, carbon-13 labeled [1,2-13C]acetoacetate and carbon-13 labeled
[3,4-13C]3-hydroxybutyrate initiated over two hours. During this period, 5 ml. blood draws
will occur every hour to determine plasma non-esterified fatty acids (NEFA), ketones,
glucose, insulin, and glucagon levels. At two hrs after initiation of the infusion, a 50 ml.
blood draw will be performed to obtain samples for spectroscopic determination of the rate of
ketogenesis and citrate oxidation in the citric acid (TCA) cycle. At the completion of study
procedures, the stable isotope infusion will be stopped and participants will be sent to the
CTRC outpatient clinic for Dual Energy x-Ray Absorptiometry (DEXA) to determine estimated
total body fat measurement. After the DEXA, healthy subjects will be discharged to home;
NAFLD subjects will be admitted to CTRC for liver biopsy, if needed.
The conclusion of the metabolic studies in week 0 marks the end of the study for control
subjects, while NAFLD subjects will be initiated on Vitamin E or placebo therapy at this time
point. All subjects will be given a meal and evaluated for stability (vital signs within
normal limits) prior to discharge to home. The total amount of blood collected for overnight
fasting studies will be less than 325 mls.
Follow-Up Visits (Weeks 4, 8, 12) Subjects will visit with the research nurse and/or Dr.
Browning to monitor compliance with the vitamin E/placebo regime. At each follow-up visit,
subjects will have blood collected (approximately 10mls.) per Table 1. Additionally, each
volunteer will have an MRS to measure liver triglyceride content.
Phenotype Visit (Week 16) This is a repeat of the phenotype visit at Week -1.
Overnight Fast (Week 17) This is a repeat of the overnight fast at Week 0. All procedures,
including the isotope studies will be the same.
Inclusion Criteria:
NAFLD/NASH SUBJECTS
- Male and Female, Age 18-65 years of all racial and ethnic origins
- Hepatic steatosis by radiologic study with or without liver enzyme elevation
- BMI < 35 kg/m2
- English or Spanish language
- Females of childbearing potential must be willing to practice an acceptable form of
birth control throughout the protocol
- May also have Type 2 Diabetes (T2DM) with:
Hemoglobin A1C < 8.5 % of total Prior, current or no oral antidiabetic medication usage
CONTROL SUBJECTS:
- Age 18-65 years.
- BMI ≤ 35 kg/m2
- English or Spanish language
- Females of childbearing potential must be willing to practice an acceptable form of
birth control throughout the protocol
- May also have T2DM with:
Hemoglobin A1C < 8.5 % of total Prior, current or no oral antidiabetic medication usage
Exclusion Criteria:
ALL SUBJECTS:
- Diabetes type 1
- Diabetes type 2 with:
Hemoglobin A1C < 8.5 % of total Current or prior insulin usage
- Medications or conditions that confound the diagnosis of NAFLD
- Excessive alcohol intake (>30 g/day in men and >20 g/day in women)
- Chronic liver disease other than NAFLD/NASH
- Glucocorticoids
- Medications or conditions that alter hepatic metabolism
- Autoimmune disorders
- Current or chronic infection
- Other endocrine disorders
- Recent weight loss (> 10 lbs. within the past 3 months)
- Prescription weight-loss medications
- Medical conditions likely to increase the risk of intervention Renal insufficiency
(creatinine > 1.4 mg/dL) Baseline metabolic acidosis Congestive heart failure
- Conditions or behaviors likely to affect the conduct of the study Pregnancy and
breastfeeding confirmed by urine pregnancy test prior to all imaging or invasive
procedure such as the euglycemic clamp, stable isotope studies, as well as prior to
initiation of Vitamin E.
- Concurrent participation in another research project
- Inability to accept treatment assignment
- Major psychiatric disorder or substance abuse
CONTROL SUBJECTS (in addition to the above):
- Liver disease Elevated liver function tests Hepatic steatosis
- Metabolic syndrome Hypertriglyceridemia (fasting plasma triglycerides > 150 mg/dL).
Systolic blood pressure > 140 mmHg Diastolic blood pressure > 80 mmHg
- Exercise above activities of daily living
We found this trial at
1
site
1801 Inwood Rd
Dallas, Texas 75390
Dallas, Texas 75390
(214) 645-3300
Phone: 214-645-2726
University of Texas Southwestern Medical Center UT Southwestern is an academic medical center, world-renowned for...
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