Bioenergetics shapes cellular death pathways in Leber's hereditary optic neuropathy

A model of mitochondrial neurodegeneration

Valerio Carelli, Michela Rugolo, Gianluca Sgarbi, Anna Ghelli, Claudia Zanna, Alessandra Baracca, Giorgio Lenaz, Eleonora Napoli, Andrea Martinuzzi, Giancarlo Solaini

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

Leber's hereditary optic neuropathy (LHON) was the first maternally inherited disease to be associated with point mutations in mitochondrial DNA and is now considered the most prevalent mitochondrial disorder. The pathology is characterized by selective loss of ganglion cells in the retina leading to central vision loss and optic atrophy, prevalently in young males. The pathogenic mtDNA point mutations for LHON affect complex I with the double effect of lowering the ATP synthesis driven by complex I substrates and increasing oxidative stress chronically. In this review, we first consider the biochemical changes associated with the proton-translocating NADH-quinone oxidoreductase of mitochondria in cybrid cells carrying the most common LHON mutations. However, the LHON cybrid bioenergetic dysfunction is essentially compensated under normal conditions, i.e. in glucose medium, but is unrevealed by stressful conditions such as growing cybrids in glucose free/galactose medium, which forces cells to rely only on respiratory chain for ATP synthesis. In fact, the second part of this review deals with the investigation of LHON cybrid death pathway in galactose medium. The parallel marked changes in antioxidant enzymes, during the time-course of galactose experiments, also reveal a relevant role played by oxidative stress. The LHON cybrid model sheds light on the complex interplay amongst the different levels of biochemical consequences deriving from complex I mutations in determining neurodegeneration in LHON, and suggests an unsuspected role of bioenergetics in shaping cell death pathways.

Original languageEnglish
Pages (from-to)172-179
Number of pages8
JournalBiochimica et Biophysica Acta - Bioenergetics
Volume1658
Issue number1-2
DOIs
Publication statusPublished - Jul 23 2004

Fingerprint

Leber's Hereditary Optic Atrophy
Energy Metabolism
Optics
Galactose
Oxidative stress
Mitochondrial DNA
Point Mutation
Oxidative Stress
Adenosine Triphosphate
Glucose
Optic Atrophy
Mitochondrial Diseases
Mutation
Mitochondria
Electron Transport
Ganglia
Pathology
Cell death
Retina
Cell Death

Keywords

  • Apoptosis
  • ATP synthesis
  • Complex I
  • LHON
  • Mitochondria
  • ROS

ASJC Scopus subject areas

  • Biophysics

Cite this

Bioenergetics shapes cellular death pathways in Leber's hereditary optic neuropathy : A model of mitochondrial neurodegeneration. / Carelli, Valerio; Rugolo, Michela; Sgarbi, Gianluca; Ghelli, Anna; Zanna, Claudia; Baracca, Alessandra; Lenaz, Giorgio; Napoli, Eleonora; Martinuzzi, Andrea; Solaini, Giancarlo.

In: Biochimica et Biophysica Acta - Bioenergetics, Vol. 1658, No. 1-2, 23.07.2004, p. 172-179.

Research output: Contribution to journalArticle

Carelli, Valerio ; Rugolo, Michela ; Sgarbi, Gianluca ; Ghelli, Anna ; Zanna, Claudia ; Baracca, Alessandra ; Lenaz, Giorgio ; Napoli, Eleonora ; Martinuzzi, Andrea ; Solaini, Giancarlo. / Bioenergetics shapes cellular death pathways in Leber's hereditary optic neuropathy : A model of mitochondrial neurodegeneration. In: Biochimica et Biophysica Acta - Bioenergetics. 2004 ; Vol. 1658, No. 1-2. pp. 172-179.
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