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Adipose Tissue Insulin Resistance Is Longitudinally Associated With Adipose Tissue Dysfunction, Circulating Lipids, and Dysglycemia: The PROMISE Cohort

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posted on 17.05.2021, 19:55 by Zhila Semnani-Azad, Philip W. Connelly, Richard P. Bazinet, Ravi Retnakaran, David J. A. Jenkins, Stewart B. Harris, Bernard Zinman, Anthony J. Hanley
Aim: Our objective was to determine the association of adipose tissue insulin resistance with longitudinal changes in biomarkers of adipose tissue function, circulating lipids, and dysglycemia.

Research design and methods: Adults at-risk for type 2 diabetes in the Prospective Metabolism and Islet Cell Evaluation (PROMISE) cohort had up to four assessments over 9 years (n=468). Adipose tissue insulin resistance was determined using a novel validated index, Adipo-IR, calculated as the product of fasting insulin and non-esterified fatty acids measured at baseline. Fasting serum was used to measure biomarkers of adipose tissue function (adiponectin and sCD163), circulating lipids (total cholesterol, HDL, LDL, TG), and systemic inflammation (Il-6 and TNF-α). Incident dysglycemia was defined as the onset of impaired fasting glucose, impaired glucose tolerance, or type 2 diabetes at follow-up. Generalized estimating equation (GEE) models were used to assess the relationship of Adipo-IR with longitudinal outcomes.

Results: GEE analyses showed that elevated Adipo-IR was longitudinally associated with adipose tissue dysfunction (adiponectin: -4.20% (95%CI, -6.40 to –1.95); sCD163: 4.36% (95%CI, 1.73 – 7.06), HDL (-3.87% (95%CI, -5.15 to -2.57)) and TG (9.26% (95%CI, 5.01 to 13.69)). Adipo-IR was associated with increased risk of incident dysglycemia (OR=1.59; 95%CI, 1.09 to 2.31, per SD increase). Associations remained significant after adjustment for waist circumference, and surrogate indices for insulin resistance. There were no significant longitudinal associations of Adipo-IR with Il-6, TNF-α, total cholesterol, or LDL.

Conclusion: Our findings demonstrate that adipose tissue insulin resistance is prospectively associated with adipose tissue function, HDL, TG, and incident dysglycemia.


Funding

PROMISE was supported by operating grants from Diabetes Canada and the Canadian Institutes of Health Research (CIHR). ZSA was funded by the Canadian Institutes of Health Research Frederick Banting and Charles Best Canada Graduate Master's and Doctoral Scholarships, Ontario Graduate Scholarships, and the University of Toronto Banting and Best Diabetes Centre Novo Nordisk Studentships. RR holds the Boehringer Ingelheim Chair in Beta-cell Preservation, Function and Regeneration at Mount Sinai Hospital.

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