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    Area of Science:

    • Endocrinology
    • Neuroscience
    • Aging Research

    Background:

    • The physiological roles of the steroid hormone 5-androstene-3β,17β-diol (ADIOL) are not well understood.
    • Dietary restriction, including fasting and caloric restriction, is known to promote healthspan.

    Purpose of the Study:

    • To investigate the role of ADIOL in mediating the health benefits of dietary restriction.
    • To explore ADIOL's potential as a neuroprotective agent.

    Main Methods:

    • Studied the effect of fasting and caloric restriction on ADIOL biosynthesis genes.
    • Investigated ADIOL's impact on kynurenic acid levels in the nervous system using C. elegans models.
    • Assessed healthspan indicators and cellular stress responses.

    Main Results:

    • Fasting and caloric restriction upregulate genes promoting ADIOL biosynthesis.
    • ADIOL reduces neurotoxic kynurenic acid levels, requiring NHR-91 in RIM neurons.
    • Enhanced ADIOL signaling improves healthspan and suppresses APOE4-induced cellular stress.

    Conclusions:

    • ADIOL mediates the neuroprotective and pro-healthspan effects of dietary restriction.
    • ADIOL signaling is a promising therapeutic target for age-related neurodegenerative diseases and healthspan extension.