Administration of Cathepsin B inhibitor halfway through the worms' reproductive period, could extend the worms' egg quality, revealed study.
"One of the most important characteristics of ageing is the loss of reproductive ability in mid-adulthood," said Coleen Murphy, Professor at the Princeton University in the US.
"As early as the mid-30s, women start to experience declines in fertility, increased rates of miscarriage and maternal age-related birth defects. All of these problems are thought to be caused by declining egg quality, rather than a lack of eggs," Murphy added.
They found that a group of proteins called Cathepsin B proteases "downregulate", or lead to lower-quality oocytes (unfertilised eggs), as one ages.
In the study, published in the journal Current Biology, when the team administered the Cathepsin B inhibitor halfway through the worms' reproductive period, they found that even a late administration of the drug could extend the worms' egg quality.
Another experiment that knocked out the cathepsin B genes entirely succeeded in extending worms' fertility by about 10 per cent.
If applied to humans, Nicole Templeman from the varsity said, "It could be a three- to six-year extension of your reproductive period".
Reproductive decline is a hallmark of ageing, but despite its prevalence, interventions to slow the loss of reproductive capacity are lacking, researchers said.
However, the cathepsin B inhibitor is nowhere near ready for testing in humans, Murphy said, yet it could one day do something mid-reproduction to improve the rest of reproduction.