Suppression of elevated Cdc42 activity promotes the regenerative potential of aged intestinal stem cells

Homeostasis in the intestinal epithelium is maintained by Lgr5-positive intestinal stem cells (ISCs) located at the base of the crypt. The function of ISCs is reduced upon aging which leads to a decline of regeneration of the intestinal epithelium. We report that aged intestinal crypts present with an elevated activity of the small RhoGTPase Cdc42. Elevation of Cdc42 activity in young animals by genetic means causes premature ISC aging, whereas pharmacological suppression of elevated Cdc42 activity restores organoid formation potential in vitro. Consistent with a critical role of elevated Cdc42 activity in aged ISCs for a reduced regenerative capacity of aged ISCs, suppression of Cdc42 activity in vivo improves crypt regeneration in aged mice. Thus, pharmacological reduction of Cdc42 activity can improve the regeneration of aged intestinal epithelium.

Automated summary

The research reveals that elevated activity of Cdc42 in aged intestinal crypts leads to reduced function of ISCs and decreased regeneration capacity of the intestinal epithelium. Inhibiting the activity of Cdc42 can restore the regenerative ability of ISCs, thus improving the regeneration of the aged intestinal epithelium.