BACKGROUND & AIMS: Intestinal lymphoepithelial interactions occur in the epithelium and the subepithelial space. We asked whether normal, Crohn's disease (CD), or ulcerative colitis (UC) lamina propria lymphocytes (LPL) could promote intestinal epithelial cell (IEC) growth and differentiation. METHODS: T84 cells were cocultured with isolated LPL. IECs were then lysed and subjected to measurement of intestinal alkaline phosphatase (IAP) activity; Western blot analysis for MAPK and Akt activation; and real-time polymerase chain reaction to assess caudal-related homeoprotein 2 (CDX2) messenger RNA (mRNA) levels. Tissue sections were immunostained for evidence of mitogen-activated protein kinase (MAPK) and phosphatidylinositol 3-kinase (PI3K) activation, CDX2, and IAP; and CDX2 mRNA expression was assessed in human colonic biopsy specimens. RESULTS: IAP activity was increased in T84 cells cocultured for 8 days with normal LPL (P < .05) and even greater with CD LPL (P < .001). Crypt IECs in active CD mucosa expressed IAP ex vivo. Phospho-MAPK (extracellular signal-regulated kinase 1/2, p38, and c-Jun-N-terminal kinase) and phospho-Akt were seen as early as 30 minutes after coculture. MAPK activation was greatest in T84 cells cocultured with CD LPL. There was a specific increase in Phospho-p38 MAPK and Phospho-Akt staining in the nuclei of crypt IECs in active vs inactive CD, normal mucosa, and UC mucosa. CDX2 mRNA expression was increased in CD LPL cocultured T84 cells, which did not correlate with CDX2 protein localization ex vivo. CONCLUSIONS: There is cross talk between LPL and IECs, which leads to IEC differentiation. The differentiation is accelerated in CD mucosa.
BACKGROUND & AIMS: Intestinal lymphoepithelial interactions occur in the epithelium and the subepithelial space. We asked whether normal, Crohn's disease (CD), or ulcerative colitis (UC) lamina propria lymphocytes (LPL) could promote intestinal epithelial cell (IEC) growth and differentiation. METHODS: T84 cells were cocultured with isolated LPL. IECs were then lysed and subjected to measurement of intestinal alkaline phosphatase (IAP) activity; Western blot analysis for MAPK and Akt activation; and real-time polymerase chain reaction to assess caudal-related homeoprotein 2 (CDX2) messenger RNA (mRNA) levels. Tissue sections were immunostained for evidence of mitogen-activated protein kinase (MAPK) and phosphatidylinositol 3-kinase (PI3K) activation, CDX2, and IAP; and CDX2 mRNA expression was assessed in human colonic biopsy specimens. RESULTS:IAP activity was increased in T84 cells cocultured for 8 days with normal LPL (P < .05) and even greater with CD LPL (P < .001). Crypt IECs in active CD mucosa expressed IAP ex vivo. Phospho-MAPK (extracellular signal-regulated kinase 1/2, p38, and c-Jun-N-terminal kinase) and phospho-Akt were seen as early as 30 minutes after coculture. MAPK activation was greatest in T84 cells cocultured with CD LPL. There was a specific increase in Phospho-p38 MAPK and Phospho-Akt staining in the nuclei of crypt IECs in active vs inactive CD, normal mucosa, and UC mucosa. CDX2 mRNA expression was increased in CD LPL cocultured T84 cells, which did not correlate with CDX2 protein localization ex vivo. CONCLUSIONS: There is cross talk between LPL and IECs, which leads to IEC differentiation. The differentiation is accelerated in CD mucosa.
Authors: Yaping Chen; Kevin Chou; Elaine Fuchs; Wendy L Havran; Richard Boismenu Journal: Proc Natl Acad Sci U S A Date: 2002-10-10 Impact factor: 11.205
Authors: Goo Lee; Tatiana Goretsky; Elizabeth Managlia; Ramanarao Dirisina; Ajay Pal Singh; Jeffrey B Brown; Randal May; Guang-Yu Yang; Josette William Ragheb; B Mark Evers; Christopher R Weber; Jerrold R Turner; Xi C He; Rebecca B Katzman; Linheng Li; Terrence A Barrett Journal: Gastroenterology Date: 2010-05-24 Impact factor: 22.682
Authors: Edward E S Nieuwenhuis; Tetsuya Matsumoto; Dicky Lindenbergh; Rob Willemsen; Arthur Kaser; Ytje Simons-Oosterhuis; Sylvia Brugman; Keizo Yamaguchi; Hiroki Ishikawa; Yuji Aiba; Yasuhiro Koga; Janneke N Samsom; Kenshiro Oshima; Mami Kikuchi; Johanna C Escher; Masahira Hattori; Andrew B Onderdonk; Richard S Blumberg Journal: J Clin Invest Date: 2009-04-06 Impact factor: 14.808