Since IL-33 and Hepatocyte Growth Factor (HGF) have been demonstrated as factors released by fibroblasts involved in mucosal healing processes [22,23], the effect of PG on the release of both factors was tested by quantifying the levels of IL-33 and HGF in the supernatants of IBD fibroblasts stimulated for 48 h in presence or the absence of PG (5 μg/mL). The gene discussed is IL33; the disease is inflammatory bowel disease.