Project description:<p>The Insulin Resistance Atherosclerosis Study (IRAS) was an epidemiologic cohort study designed to examine the relationship between insulin resistance and carotid atherosclerosis across a range of glucose tolerance. Individuals of self-reported Mexican-American ethnicity were recruited in San Antonio, TX and San Luis Valley, CO. Recruitment was balanced across age and glucose tolerance status. GUARDIAN includes 173 individuals from the IRAS. Insulin sensitivity was obtained by FSIGT.</p>
Project description:<p>TThe IRAS Family Study was a family study designed to examine the genetic and epidemiologic basis of glucose homeostasis traits and abdominal adiposity. Briefly, self-reported Mexican pedigrees were recruited in San Antonio, TX and San Luis Valley, CO. Probands with large families were recruited from the initial non-family-based IRAS Study, which was modestly enriched for impaired glucose tolerance and T2D. GUARDIAN includes 1,024 individuals in 88 pedigrees from the IRAS Family Study. Insulin sensitivity was obtained by FSIGT.</p>
Project description:Postoperative insulin resistance refers to the phenomenon that the body’s glucose uptake stimulated by insulin is reduced due to stress effects such as trauma or the inhibitory effect of insulin on liver glucose output is weakened after surgery.
There is a clear link between postoperative insulin resistance and poor perioperative prognosis. Therefore, exploring interventions to reduce postoperative stress insulin resistance, stabilize postoperative blood glucose, and reduce postoperative complications are clinical problems that need to be solved urgently. In recent years, research on branched-chain amino acids and metabolic diseases has become a hot spot. Studies have found that in the rat model, preoperatively given a high branched-chain amino acid diet can inhibit postoperative insulin resistance and stabilize blood glucose levels. This research plan is to try to add branched-chain amino acids before surgery to observe the occurrence of postoperative insulin resistance in patients.
Project description:Adipocytes play a major role in whole body fuel homeostasis. Integrated proteomic analysis of adipose from insulin resistant versus healthy humans or mice or in 3T3-L1 adipocytes revealed defects in the mevalonate/coenzyme Q (CoQ) biosynthesis pathway as a unifying feature of adipocyte insulin resistance. CoQ was decreased selectively in mitochondria in all insulin resistant conditions and this was associated with a selective increase in mitochondrial oxidative stress. CoQ supplementation lowered mitochondrial oxidative stress and reversed insulin resistance in vitro and in vivo. Decreasing mitochondrial CoQ by genetic or pharmacological means caused insulin resistance by increasing mitochondrial oxidants from complex II. Our data suggest that loss of mitochondrial CoQ is a proximal driver of mitochondrial oxidative stress and insulin resistance. These findings may explain why statin use is associated with insulin resistance, and suggest that mitochondrial CoQ may be an effective therapeutic target for treating insulin resistance in humans.