The objective of this project is to determine if mTORC1 inhibition by 24 weeks of daily (0.5 mg/day) or weekly (5 mg/week) everolimus can safely improve physiological and molecular hallmarks of aging in humans. Participants who are 55-80 years old and insulin resistant or prediabetic will be randomized to treatment and can expect to be on study for up to approximately 38 weeks. Participants aged 18-35 will not receive the intervention and can expect to be on study for up to approximately 8 weeks.
Pharmacological inhibition of mechanistic target of rapamycin (mTOR) has been repeatedly demonstrated to extend lifespan and prevent or delay several age-related diseases in diverse model systems. However, the risk of potentially serious side effects in humans have thus far prevented the long-term use of the mTOR inhibitor rapamycin as a therapy for aging and age-related diseases. Therefore, it remains unknown whether rapamycin or rapamycin analogs (rapalogs) can safely improve healthy aging in humans. The objective of this project is to determine if 24 weeks of daily low dose (0.5 mg/day) or weekly intermittent (5 mg/week) treatment with the rapalog everolimus can safely improve physiological and molecular hallmarks of aging in middle-aged to older insulin resistant adults who are at high risk for nearly every age-related condition. Using a double-blinded, randomized, placebo-controlled clinical trial, the investigators will perform a battery of gold-standard and innovative techniques to test the hypothesis that daily low dose or weekly everolimus treatment will improve 4 inter-related domains of physiological aging: metabolic, cardiac, cognitive, and physical function. The investigators will also assess the incidence of adverse events and changes from baseline blood chemistry, blood cell counts, lipids, glucose, and insulin. To comprehensively examine the molecular target specificity and the impact on mechanisms of aging by everolimus, the team will evaluate mTORC1 and mTORC2 signaling, assess mitochondrial bioenergetics, and perform a multi-omics approach (epigenomics, transcriptomics, proteomics, lipidomics, and metabolomics) in blood and/or muscle biopsy samples.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
TRIPLE
Enrollment
106
Everolimus is considered an mTOR kinase inhibitor
Everolimus is considered an mTOR kinase inhibitor
No therapeutic effect
University of Wisconsin-Madison
Madison, Wisconsin, United States
Metabolic Function: Change in peripheral insulin sensitivity
Change (pre to post) in peripheral insulin sensitivity measured by glucose disposal rate relative to circulating insulin during a dual tracer 75g oral glucose tolerance test (OGTT).
Time frame: 0 (pre-intervention) and 24 weeks (post-intervention)
Cardiac Function: Change in fractional shortening velocity
Cardiac Function will be assessed by measuring the change in fractional shortening velocity determined during the echocardiogram.
Time frame: 0 (pre-intervention) and 24 weeks (post-intervention)
Cognitive Function: Change in cerebral blood flow
Change in blood flow in posterior cingulate, medial temporal lobe (hippocampus and parahippocampus) and inferior frontal cortex assessed by brain MRI (4D Flow, Arterial Spin Labeling).
Time frame: 0 (pre-intervention) and 24 weeks (post-intervention)
Safety: Number of Participants with Adverse Events
Safety will be measured in part by reporting the number of participants with adverse events.
Time frame: up to 36 weeks
Safety: Change in concentration of blood metabolites/enzymes
Safety will be measured in part by reporting the change in the blood concentration of metabolites and enzymes as assessed by a complete metabolic panel
Time frame: 0 (pre-intervention), 4, 8, 12, 16, 20, and 24 weeks (post-intervention)
Safety: Changes in concentration of blood lipids
Safety will be measured in part by reporting the changes in the concentration of blood lipids.
Time frame: 0 (pre-intervention), 4, 8, 12, 16, 20, and 24 weeks (post-intervention)
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No therapeutic effect
Safety: Changes in number of blood cells
Safety will be measured in part by reporting the changes in the number of blood cells as determined by blood cell count with differential
Time frame: 0 (pre-intervention), 4, 8, 12, 16, 20, and 24 weeks (post-intervention)
Safety: Changes in HbA1c (%)
Safety will be measured in part by reporting the changes in the percentage of glycosylated hemoglobin (Hba1c (%))
Time frame: pre-intervention baseline, post-intervention up to 24 weeks
Safety: Changes in concentration of insulin
Safety will be measured in part by reporting the changes in fasting blood insulin concentration
Time frame: 0 (pre-intervention), 4, 8, 12, 16, 20, and 24 weeks (post-intervention)
mTOR signaling: Change in phosphorylation of downstream targets of mTOR complex 1 and complex 2 as assessed by immunoblotting and immunoprecipitation.
mTOR signaling will be assessed by measuring the change in phosphorylation of downstream targets of mTOR complex 1 and complex 2 via immunoblotting in muscle and/or peripheral mononuclear blood cells (PMBCs).
Time frame: pre-intervention baseline, post-intervention up to 24 weeks