AMP-activated protein kinase-Peroxisome proliferator-activated receptor gamma axis (AMPK-PPARγ axis)

The AMPK-PPARγ axis is a critical signaling pathway that integrates cellular energy sensing with the transcriptional regulation of glucose and lipid metabolism. It involves the functional interplay between AMP-activated protein kinase (AMPK), the body's master energy sensor, and Peroxisome proliferator-activated receptor gamma (PPARγ), a nuclear receptor that governs adipocyte differentiation and lipid storage. Under metabolic stress or pharmacological stimulation, AMPK activation typically leads to the downregulation of PPARγ-mediated anabolic processes, thereby reducing lipid accumulation and fat cell formation. Conversely, the activation of PPARγ by certain agonists can trigger downstream AMPK signaling, creating a coordinated response that enhances insulin sensitivity, promotes mitochondrial biogenesis, and reduces systemic inflammation. This axis is fundamentally involved in the pathogenesis of metabolic disorders such as type 2 diabetes, obesity, and non-alcoholic fatty liver disease (NAFLD), as well as chronic inflammatory conditions like ulcerative colitis. Therapeutic modulation of the axis using agents like metformin and thiazolidinediones aims to restore metabolic balance and suppress the inflammatory environment characteristic of chronic metabolic diseases.

Other names

AMPK-PPARγ signaling axisAMPK/PPARγ pathwayAMP-activated protein kinase-Peroxisome proliferator-activated receptor gamma signaling pathwayAMPK-PPARG axis

Drugs targeting the AMPK-PPARγ axis function through the activation of its core components to restore metabolic homeostasis. Metformin and berberine primarily activate AMPK, which subsequently inhibits the transcriptional activity and expression of PPARγ to reduce adipogenesis and lipogenesis while enhancing fatty acid oxidation [5, 15]. Conversely, thiazolidinedione drugs like rosiglitazone act as direct PPARγ agonists, which can lead to the secondary activation of AMPK via the induction of adiponectin or by altering cellular energy ratios through mitochondrial effects [4, 8]. This cross-talk promotes insulin sensitivity and suppresses pro-inflammatory signaling pathways, such as NF-κB, while promoting anti-inflammatory M2 macrophage polarization [7, 10].