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Unveiling the Molecular Legacy of Transient Insulin Resistance: Implications for Hepatic Metabolic Adaptability
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International audience. Background: Metabolic flexibility (MetF) is an organism's ability to adjust to changing metabolic supplies and energy demands. Insulin plays a central role in coordinating MetF through molecular mechanisms such as signaling pathways, transcriptional responses, and circadian regulation. Insulin resistance (IR) can impair MetF, contributing to type 2 diabetes and obesity, often stemming from continuous challenges such as sedentary lifestyles, poor diets, and circadian disruptions. Transient IR episodes, like gestational diabetes or stress-induced hyperglycemia, also heighten the risk of later diabetes development. Yet, the molecular processes post-transient IR remain poorly understood despite their health significance.
Aims and Methods: Our aims were to characterize the hepatic response to a high fat diet challenge in mice previously exposed to a transient IR episode. We integrated transcriptomic, epigenomic, lipidomic, and molecular clock assessments to provide a molecular basis for the observed dysregulations.
Results: Our study shows that temporarily blocking the insulin receptor in young mice leads to laterlife liver issues hindering PPARα-mediated adaptation to a high-fat diet. This is linked to decreased histone active marks at PPARα sites and reduced endogenous PPARα ligands. Transient insulin receptor blockade also altered the liver's molecular clock, particularly affecting PPARα transcriptional responsiveness.
Conclusions: Seemingly reversible and unnoticed metabolic challenges in early adulthood may predispose the liver to exacerbated metabolic dysfunctions when confronted with chronic challenges later in life.
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