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In vivo stabilization of OPA1 in hepatocytes potentiates mitochondrial respiration and gluconeogenesis in a prohibitin-dependent way

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Li Lingzi, Martin-Levilain Juliette, Jiménez-Sánchez Cecilia, Karaca Melis, Foti Michelangelo, Martinou Jean-Claude, Maechler Pierre,
Project Novel avenues in mitochondrial function and diabetes
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Original article (peer-reviewed)

Journal Journal of Biological Chemistry
Volume (Issue) 294(34)
Page(s) 12581 - 12598
Title of proceedings Journal of Biological Chemistry
DOI 10.1074/jbc.ra119.007601

Abstract

Patients with fatty liver diseases present altered mitochondrial morphology and impaired metabolic function. Mitochondrial dynamics and related cell function require the uncleaved form of the dynamin-like GTPase OPA1. Stabilization of OPA1 might then confer a protective mechanism against stress-induced tissue damages. To study the putative role of hepatic mitochondrial morphology in a sick liver, we expressed a cleavage-resistant long form of OPA1 (L-OPA1Δ) in the liver of a mouse model with mitochondrial liver dysfunction (i.e. the hepatocyte-specific prohibitin-2 knockout (Hep-Phb2-/-) mice). Liver prohibitin-2 deficiency caused excessive proteolytic cleavage of L-OPA1, mitochondrial fragmentation, and increased apoptosis. These molecular alterations were associated with lipid accumulation, abolished gluconeogenesis, and extensive liver damage. Such liver dysfunction was associated with severe hypoglycemia. In prohibitin-2 knockout mice, expression of L-OPA1Δ by in vivo adenovirus delivery restored the morphology but not the function of mitochondria in hepatocytes. In prohibitin-competent mice, elongation of liver mitochondria by expression of L-OPA1Δ resulted in excessive glucose production associated with increased mitochondrial respiration. In conclusion, mitochondrial dynamics participates in the control of hepatic glucose production.
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