Autophagy induction extends lifespan and reduces lipid content in response to frataxin silencing in C. elegans

Severe mitochondria deficiency leads to a number of devastating degenerative disorders, yet, mild mitochondrial dysfunction in different species, including the nematode Caenorhabditis elegans, can have pro-longevity effects. This apparent paradox indicates that cellular adaptation to partial mitochondrial stress can induce beneficial responses, but how this is achieved is largely unknown. Complete absence of frataxin, the mitochondrial protein defective in patients with Friedreich's ataxia, is lethal in C. elegans, while its partial deficiency extends animal lifespan in a p53 dependent manner. In this paper we provide further insight into frataxin control of C. elegans longevity by showing that a substantial reduction of frataxin protein expression is required to extend lifespan, affect sensory neurons functionality, remodel lipid metabolism and trigger autophagy. We find that Beclin and p53 genes are required to induce autophagy and concurrently reduce lipid storages and extend animal lifespan in response to frataxin suppression. Reciprocally, frataxin expression modulates autophagy in the absence of p53. Human Friedreich ataxia-derived lymphoblasts also display increased autophagy, indicating an evolutionarily conserved response to reduced frataxin expression. In sum, we demonstrate a causal connection between induction of autophagy and lifespan extension following reduced frataxin expression, thus providing the rationale for investigating autophagy in the pathogenesis and treatment of Friedreich's ataxia and possibly other human mitochondria-associated disorders.

Schiavi, Alfonso
Torgovnick, Alessandro
Kell, Alison
Megalou, Evgenia
Castelein, Natascha
Guccini, Ilaria
Marzocchella, Laura
Gelino, Sara
Hansen, Malene
Malisan, Florence
CondÚ, Ivano
Bei, Roberto
Rea, Shane L.
Braeckman, Bart P.
Tavernarakis, Nektarios
Testi, Roberto
Ventura, Natascia
Item Type: 
Journal Article
Publication Title: 
Experimental Gerontology
Journal Abbreviation: 
Exp. Gerontol.
Publication Date: 
Publication Year: 
Library Catalog: 
NCBI Published Medical (?)
PMID: 23247094 PMCID: PMC3572394

Turabian/Chicago Citation

Alfonso Schiavi, Alessandro Torgovnick, Alison Kell, Evgenia Megalou, Natascha Castelein, Ilaria Guccini, Laura Marzocchella, Sara Gelino, Malene Hansen, Florence Malisan, Ivano CondÚ, Roberto Bei, Shane L. Rea, Bart P. Braeckman, Nektarios Tavernarakis, Roberto Testi and Natascia Ventura. 2013-02. "Autophagy induction extends lifespan and reduces lipid content in response to frataxin silencing in C. elegans." Experimental Gerontology 48: 2: 191-201. 10.1016/j.exger.2012.12.002.

Wikipedia Citation

<ref> {{Cite journal | doi = 10.1016/j.exger.2012.12.002 | issn = 1873-6815 | volume = 48 | pages = 191-201 | last = Schiavi | first = Alfonso | coauthors = Torgovnick, Alessandro, Kell, Alison, Megalou, Evgenia, Castelein, Natascha, Guccini, Ilaria, Marzocchella, Laura, Gelino, Sara, Hansen, Malene, Malisan, Florence, CondÚ, Ivano, Bei, Roberto, Rea, Shane L., Braeckman, Bart P., Tavernarakis, Nektarios, Testi, Roberto, Ventura, Natascia | title = Autophagy induction extends lifespan and reduces lipid content in response to frataxin silencing in C. elegans | journal = Experimental Gerontology | date = 2013-02 | pmid = | pmc = }} </ref>