Adults who gain most of their excess weight in the abdominal area typically do not respond to factors that "turn on" fat cells the same way as people who don't have excessive weight. Researchers are trying to understand why fat tissue responds differently in people with different body types.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
24
Intravenous infusion 200 ug/hr for 2 hours, 100 ug/hr for 30 minutes
Intravenous infusion
Mayo Clinic in Rochester
Rochester, Minnesota, United States
RECRUITINGFree Fatty Acid (FFA) release from femoral, splanchnic and upper body subcutaneous adipose tissue
regional palmitate release rates (micromol/min) will be measured using a combination of leg and splanchnic blood flow combined with stable isotope tracer measurements of palmitate uptake and release across the leg and splanchnic bed. Upper body, non-splanchnic palmitate release will be calculated as: total palmitate release - (splanchnic palmitate release + (leg palmitate release x 2)). Release rates will be measured at baseline (overnight fasting) and in response to the infusion of somatostatin plus epinephrine. This will allow us to understand the factors that may limit maximum lipolysis stimulation in upper body obesity for leg, splanchnic and upper body non-splanchnic adipose tissue palmitate release.
Time frame: approximately 3.5 hours
stimulated FFA release in volunteers with and without obesity.
we will measure whether stimulated adipose tissue lipolysis from infusions of somatostatin and epinephrine is impaired in UBO and, if so, if this is related to regional differences in lipolysis and lipolysis-regulating proteins;
Time frame: approximately 3.5 hours
Role of reesterification in adipose tissue FFA release
We will measure the regional FFA:glycerol release ratio, a measure of intracellular reesterification, differs between UBO and non-UBO adults in a way that accounts for the differences in systemic FFA delivery. This will require the use of both FFA and glycerol tracers.
Time frame: approximately 3.5 hours
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