Steroidogenic control of liver metabolism through a nuclear receptor-network

• Main Authors: Alexandra Milona (Author), Vittoria Massafra (Author), Harmjan Vos (Author), Jyoti Naik (Author), Natalia Artigas (Author), Helen A.B. Paterson (Author), Ingrid T.G.W. Bijsmans (Author), Ellen C.L. Willemsen (Author), Jose M. Ramos Pittol (Author), Irene Miguel-Aliaga (Author), Piter Bosma (Author), Boudewijn M.T. Burgering (Author), Catherine Williamson (Author), Santiago Vernia (Author), Waljit S. Dhillo (Author), Saskia W.C. van Mil (Author), Bryn M. Owen (Author)
• Format: Book
• Published: Elsevier, 2019-12-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

Summary

Objective: Coupling metabolic and reproductive pathways is essential for the survival of species. However, the functions of steroidogenic enzymes expressed in metabolic tissues are largely unknown. Methods and results: Here, we show that in the liver, the classical steroidogenic enzyme Cyp17a1 forms an essential nexus for glucose and ketone metabolism during feed-fast cycles. Both gain- and loss-of-function approaches are used to show that hepatic Cyp17a1 is induced by fasting, catalyzes the production of at least one hormone-ligand (DHEA) for the nuclear receptor PPARα, and is ultimately required for maintaining euglycemia and ketogenesis during nutrient deprivation. The feedback-loop that terminates Cyp17a1-PPARα activity, and re-establishes anabolic liver metabolism during re-feeding is mapped to postprandial bile acid-signaling, involving the receptors FXR, SHP and LRH-1. Conclusions: Together, these findings represent a novel paradigm of homeostatic control in which nutritional cues feed-forward on to metabolic pathways by influencing extragonadal steroidogenesis. Keywords: FXR, FGF21, Bile acids, Liver, Metabolism, Fasting, Gluconeogenesis, Diabetes, Steroidogenesis, Cyp17a1

Item Description

2212-8778
10.1016/j.molmet.2019.09.007