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Article dans une revue

NME4/nucleoside diphosphate kinase D in cardiolipin signaling and mitophagy

Abstract : Mitophagy is an emerging paradigm for mitochondrial quality control and cell homeostasis. Dysregulation of mitophagy can lead to human pathologies such as neurodegenerative disorders and contributes to the aging process. Complex protein signaling cascades have been described that regulate mitophagy. We have identified a novel lipid signaling pathway that involves the phospholipid cardiolipin (CL). CL is synthesized and normally confined at the inner mitochondrial membrane. However, upon a mitophagic trigger, ie, collapse of the inner membrane potential, CL is rapidly externalized to the mitochondrial surface with the assistance of the hexameric nucleoside diphosphate kinase D (NME4, NDPK-D, or NM23-H4). In addition to its NDP kinase activity, NME4/NDPK-D shows intermembrane phospholipid transfer activity in vitro and in cellular systems, which relies on NME4/NDPK-D interaction with CL, CL-dependent crosslinking of inner and outer mitochondrial membranes by symmetrical, hexameric NME4/NDPK-D, and a putative NME4/NDPK-D-based CL-transfer pathway. CL exposed at the mitochondrial surface then serves as an ‘eat me’ signal for the mitophagic machinery; it is recognized by the LC3 receptor of autophagosomes, targeting the dysfunctional mitochondrion to lysosomal degradation. Similar NME4-supported CL externalization is likely also involved in apoptosis and inflammatory reactions.
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Contributeur : Sarah Hamant <>
Soumis le : lundi 19 novembre 2018 - 15:21:44
Dernière modification le : mercredi 19 août 2020 - 11:17:46

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Uwe Schlattner, Malgorzata Tokarska-Schlattner, Richard Epand, Mathieu Boissan, Marie-Lise Lacombe, et al.. NME4/nucleoside diphosphate kinase D in cardiolipin signaling and mitophagy. Laboratory Investigation, Nature Publishing Group, 2017, 98 (2), pp.228 - 232. ⟨10.1038/labinvest.2017.113⟩. ⟨hal-01926965⟩



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