RRC ID 55874
Author Ezcurra M, Benedetto A, Sornda T, Gilliat AF, Au C, Zhang Q, van Schelt S, Petrache AL, Wang H, de la Guardia Y, Bar-Nun S, Tyler E, Wakelam MJ, Gems D.
Title C. elegans Eats Its Own Intestine to Make Yolk Leading to Multiple Senescent Pathologies.
Journal Curr Biol
Abstract Aging (senescence) is characterized by the development of numerous pathologies, some of which limit lifespan. Key to understanding aging is discovery of the mechanisms (etiologies) that cause senescent pathology. In C. elegans, a major senescent pathology of unknown etiology is atrophy of its principal metabolic organ, the intestine. Here we identify a cause of not only this pathology but also of yolky lipid accumulation and redistribution (a form of senescent obesity): autophagy-mediated conversion of intestinal biomass into yolk. Inhibiting intestinal autophagy or vitellogenesis rescues both visceral pathologies and can also extend lifespan. This defines a disease syndrome leading to multimorbidity and contributing to late-life mortality. Activation of gut-to-yolk biomass conversion by insulin/IGF-1 signaling (IIS) promotes reproduction and senescence. This illustrates how major, IIS-promoted senescent pathologies in C. elegans can originate not from damage accumulation but from direct effects of futile, continued action of a wild-type biological program (vitellogenesis).
Volume 28(16)
Pages 2544-2556.e5
Published 2018-8-20
DOI 10.1016/j.cub.2018.06.035
PII S0960-9822(18)30826-1
PMID 30100339
PMC PMC6108400
MeSH Aging / physiology* Animals Autophagy / physiology* Caenorhabditis elegans / physiology* Egg Yolk / metabolism* Intestines / physiology* Signal Transduction Vitellogenesis / physiology*
IF 9.193
Times Cited 19
C.elegans tm331