IL15 derived from epithelial cells and other cytokines secreted by lamina propria CD4+ T-helper type 1 cells (IL2, IL21, and TNF-) have been shown to induce maturation arrest, proliferation, and expansion of the aberrant IELs by inducing granzyme BCdependent cleavage … Continue reading IL15 derived from epithelial cells and other cytokines secreted by lamina propria CD4+ T-helper type 1 cells (IL2, IL21, and TNF-) have been shown to induce maturation arrest, proliferation, and expansion of the aberrant IELs by inducing granzyme BCdependent cleavage of intracellular NOTCH1 and activation of the JAK-STAT signaling pathway