Clinical trial NCT02781350: Anti-inflammatory Effects of Fiber
Official title: To Study the Effect of High Fat High Carbohydrate Meal on Oxidative Load, Inflammatory Mediators and Insulin Resistance in Normal and Obese Subjects
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Postprandial Inflammation
Keywords: high fat diet
insulinogenesis
Fiber
inflammation
Lead sponsor: University at Buffalo
Sponsor class: OTHER
First posted: 2016-05-24
Enrollment: 20
Sex: ALL
Minimum age (years): 18
Maximum age (years): 80
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: PREVENTION

Brief summary: The main objective of this research is to investigate the effect of addition of fiber on the high fat high carbohydrate (HFHC) meal induced inflammation and oxidative stress mechanisms at the molecular level in humans, in vivo. The investigators have previously shown that the intake of one HFHC meal leads to an increase in oxidative stress and inflammation. HFHC meal also induces an increase in the expression of suppressor of cytokine signaling- 3 (SOCS-3) in the mononuclear cells (MNC), which interferes with insulin signal transduction and contributes to the pathogenesis of insulin resistance. In contrast, an American heart association (AHA) meal rich in fruits and fiber does not induce these effects. These observations are important since HFHC meal not only induces oxidative stress and inflammation but also lays the foundations of a potentially greater insulin resistance through the induction of SOCS-3, TLR-4 and TLR-2.

Detailed description: The main objective of this research is to investigate the effect of high fat high carbohydrate (HFHC) meal on inflammatory mechanisms at the molecular level in humans, in vivo versus HFHC meal plus fiber. HFHC meal includes egg muffin, sausage muffin sandwiches and two hash browns. The Investigators have previously shown that the intake of one HFHC meal leads to an increase in reactive oxygen species (ROS) generation and the expression of p47, the key subunit of NADPH oxidase, with a concomitant increase in intranuclear nuclear factor κB (NFkB) binding. More recently, the investigators have also shown that HFHC meal leads to an increase in plasma endotoxin (lipopolysaccharide, LPS) concentrations along with an increase in the expression of Toll like receptor-4 (TLR-4), the receptor for endotoxin, and TLR-2, the receptor for several products of Gram positive bacteria. In addition, it also causes an increase in lipopolysaccharide binding protein (LBP), the protein which facilitates the binding of LPS to CD14 and TLR-4. Finally, HFHC meal also induces an increase in the expression of suppressor of cytokine signaling- 3 (SOCS-3) in the mononuclear cells (MNC) (1), which interferes with insulin signal transduction and contributes to the pathogenesis of insulin resistance. In contrast, an AHA meal does not induce these effects. These observations are important since HFHC meal not only induces oxidative stress and inflammation but also lays the foundations of (2) a potentially greater response to an inflammatory challenge through the induction of an increase in LPS concentrations and the expression of TLR-4 and TLR-2; and (3) insulin resistance through the induction of SOCS-3, TLR-4 and TLR-2.

Eligibility criteria: Inclusion Criteria:

* Age: 18 to 80 years of age
* Subject will be available for duration of the study and willing to comply with all study requirements
* Written and informed consent signed and dated
* Nonsmoker

Exclusion Criteria:

* Coronary artery disease (CAD): documented by history of myocardial infarction, angioplasty/stent placement, angina, exercise EKG positive for ischemia or angiographic evidence of CAD
* Patient on non-steroidal anti-inflammatory drugs or steroids
* Hepatic disease (transaminase \> 3 times normal)
* Renal impairment (serum creatinine \> 1.5 mg/dl)
* History of drug or alcohol abuse
* Participation in any other concurrent clinical trials
* Use of an investigational agent or therapeutic regimen within 30 days of study
* Pregnancy
* Premenopausal women who are trying to be pregnant
* Anemia

Primary outcomes:
measure: effect of addition of fiber on the relative change of NF-Kappa B
timeFrame: Baseline and 1 week
Secondary outcomes:
measure: effect of addition of fiber on Changes in ROS generation.
timeFrame: Baseline and 1 week
measure: effect of addition of fiber on Changes in TLR-4 mRNA expression in MNC
timeFrame: Baseline and 1 week
measure: effect of addition of fiber on Changes in SOCS-3 mRNA expression in MNC
timeFrame: Baseline and 1 week
measure: effect of addition of fiber on Changes in insulin secretion between the 2 visits (HFHC meal with or without fiber) will be compared as percent change from baseline.
timeFrame: Baseline and 1 week
Other outcomes:
Locations:
city: Buffalo
country: United States
facility: ECMC Ambulatory Center, 3rd Floor
state: New York
Study officials:
References: