GPCR-Gα13 signaling regulates survival of intestinal intraepithelial CD8(+) lymphocytes through migration to cytokine-rich niches.

Gα13 signaling is essential for the migration and survival of intestinal intraepithelial CD8(+) lymphocytes, with deficiency causing a 100% loss of these cells in the intestine.

• Why it matters: Understanding how IEL positioning and maintenance are regulated is crucial because these cells support tissue integrity and immune defense, yet the signaling pathways involved are not fully known.
• What they did: The study used genetic knockout models and CRISPR-Cas9 screening to investigate Gα13 and its receptor GPR132, revealing that Gα13 deficiency impairs IEL movement, maturation, and survival, especially in the villous niche.
• The result: Loss of Gα13 signaling worsened colitis and increased tumor growth in mice, highlighting that targeting this pathway could offer new therapeutic strategies for intestinal diseases.