Renal tubule Cpt1a overexpression protects from kidney fibrosis by restoring mitochondrial homeostasis

Author:

Miguel Verónica,Tituaña Jessica,Herrero J.Ignacio,Herrero Laura,Serra Dolors,Cuevas Paula,Barbas Coral,Puyol Diego Rodríguez,Márquez-Expósito Laura,Ruiz-Ortega Marta,Castillo Carolina,Sheng Xin,Susztak Katalin,Ruiz-Canela MiguelORCID,Salas-Salvadó Jordi,González Miguel A. Martínez,Ortega Sagrario,Ramos Ricardo,Lamas Santiago

Abstract

AbstractChronic kidney disease (CKD) remains a major epidemiological, clinical and biomedical challenge. During CKD, renal tubular epithelial cells (TECs) suffer a persistent inflammatory and profibrotic response. Fatty acid oxidation (FAO), the main source of energy for TECs, is reduced in kidney fibrosis and contributes to its pathogenesis. To determine if FAO gain-of-function (FAO-GOF) could protect from fibrosis, we generated a conditional transgenic mouse model with overexpression of the fatty acid shuttling enzyme carnitine palmitoyl-transferase 1 A (CPT1A) in TECs. Cpt1a knock-in (CPT1A KI) mice subjected to three different models of renal fibrosis (unilateral ureteral obstruction, folic acid nephropathy-FAN and adenine induced nephrotoxicity) exhibited decreased expression of fibrotic markers, a blunted pro-inflammatory response and reduced epithelial cell damage and macrophage influx. Protection from fibrosis was also observed when Cpt1a overexpression was induced after FAN. FAO-GOF restituted oxidative metabolism and mitochondrial number and enhanced bioenergetics increasing palmitate oxidation and ATP levels, changes also recapitulated in TECs exposed to profibrotic stimuli. Studies in patients evidenced decreased CPT1 levels and increased accumulation of short and middle chain acyl-carnitines, reflecting impaired FAO in human CKD. We propose that strategies based on FAO-GOF may constitute powerful alternatives to combat fibrosis inherent to CKD.Graphical abstractOverexpression of CPT1A impedes tubular epithelial renal cell dedifferentiation and a pro-fibrotic phenotype by restoring mitochondrial metabolic bioenergetics.

Publisher

Cold Spring Harbor Laboratory

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