A small-molecule screen identifies novel aging modulators by targeting 5-HT/DA signaling pathway.

The risk of many human diseases including cardiovascular diseases, cancer, neurodegenerative diseases, and musculoskeletal disorders rises significantly in the elderly. With the increase in the aging population, it is becoming increasingly important to understand the biology of healthy aging and develop interventions that slow down the aging process or prevent age-related diseases. In this study, by a high-throughput screen in Caenorhabditis elegans (C. elegans), we identified 11 small molecules that promote healthy aging. Among them, Carbamazepine (a voltage-gated channels inhibitor) and Calmagite (a calcium and magnesium indicator) enhanced serotonin (5-HT) and dopamine (DA) levels, extended lifespan, and preserved several important behaviors in aging C. elegans. These behaviors include slowing responses to food, pharyngeal pumping, locomotion, and male mating. Interestingly, we further found that administration of Carbamazepine or Calmagite alleviated hyperexcitability of aging male diagonal muscles and improved behavioral performance by ameliorating Ca(2+) homeostasis. Mechanistically, administration of Carbamazepine or Calmagite induced nuclear translocation of the transcription factor DAF-16 and thus up-regulated its downstream genes numr-1/-2, which are known to promote resistance to metal-induced stresses and longevity. Taken together, our study offers a way for the discovery of drugs that promote healthy aging, and provides potential interventions for preventing behavioral deterioration in the elderly.