The phosphatase PRL-3 affects intestinal homeostasis by altering the crypt cell composition

Area of Science:

• Gastroenterology
• Cancer Biology
• Stem Cell Biology

Background:

• Phosphatase of regenerating liver-3 (PRL-3) promotes tumor growth in gastrointestinal adenocarcinomas.
• Intestinal cell homeostasis relies on Lgr5+ stem cells and Paneth cells.
• The impact of PRL-3 on healthy intestinal stem cells in vivo is unknown.

Purpose of the Study:

• To investigate the effects of PRL-3 overexpression on intestinal cell homeostasis and stem cell fitness in a non-cancerous mouse model.
• To explore the functional consequences of aberrant PRL-3 activity on intestinal self-renewal.
• To establish a link between PRL-3, cellular homeostasis, and tumor onset mechanisms.

Main Methods:

• Utilized a doxycycline-inducible PRL-3 mouse strain for controlled gene expression.
• Generated primary 3D intestinal organoid cultures from PRL-3 expressing mice.
• Administered a PRL inhibitor to assess rescue of observed phenotypes.

Main Results:

• Aberrant PRL-3 expression led to Lgr5+ intestinal stem cell death and Paneth cell expansion.
• Homozygous PRL-3 expression resulted in early mortality in mice.
• Impaired intestinal organoid formation was observed and rescued by a PRL inhibitor.

Conclusions:

• Elevated PRL-3 phosphatase activity in healthy intestinal epithelium disrupts cell homeostasis.
• PRL-3 overexpression impairs intestinal stem cell fitness and self-renewal capacity.
• This cellular mechanism connects PRL-3 activity to increased susceptibility to tumor formation.