TY - JOUR
T1 - Possible predisposition for colorectal carcinogenesis due to altered gene expressions in normal appearing mucosa from patients with colorectal neoplasia
AU - Petersen, Christian Hunnicke
AU - Mahmood, Badar
AU - Badsted, Christoffer
AU - Dahlby, Tina
AU - Rasmussen, Hanne Borger
AU - Hansen, Mark Berner
AU - Bindslev, Niels
PY - 2019
Y1 - 2019
N2 - BackgroundInvestigations of colorectal carcinogenesis have mainly focused on examining neoplastic tissue. With our aim of identifying potentially cancer-predisposing molecular compositions, we chose a different approach by examining endoscopically normal appearing colonic mucosa of patients with and without colorectal neoplasia (CRN). Directed by this focus, we selected 18 genes that were previously found with altered expression in colorectal cancer affected mucosa.MethodsBiopsies of colonic mucosa were sampled from 27 patients referred for colonoscopy on suspicion of colorectal disease. Of these, 14 patients had present or previous CRN and the remaining 13 patients served as controls. Using qPCR and Western blot technique, we investigated mRNA and protein expressions. Expressions were investigated for selected kinases in the extracellular signal-regulated kinase/mitogen activated protein kinase (ERK/MAPK), the phosphoinositide 3-kinase/Akt, and the Wnt/-catenin pathways as well as for selected phosphatases and several entities associated with prostaglandin E2 (PGE(2)) signaling. Colonic mucosal contents of PGE(2) and PGE(2) metabolites were determined by use of ELISA.ResultsWe found up-regulation of ERK1, ERK2, Akt1, Akt2, PLA2G4A, prostanoid receptor EP3 and phosphatase scaffold subunit PPP2R1B mRNA expression in normal appearing colonic mucosa of CRN patients compared to controls.ConclusionPresent study supports that even normal appearing mucosa of CRN patients differs from that of non-CRN patients at a molecular level. Especially expression of ERK1 mRNA was increased (p=0.007) in CRN group. ERK1 may therefore be considered a potential candidate gene as predictive biomarker for developing CRN. Further validation in larger cohorts are required to determine such predictive use in translational medicine and clinics.
AB - BackgroundInvestigations of colorectal carcinogenesis have mainly focused on examining neoplastic tissue. With our aim of identifying potentially cancer-predisposing molecular compositions, we chose a different approach by examining endoscopically normal appearing colonic mucosa of patients with and without colorectal neoplasia (CRN). Directed by this focus, we selected 18 genes that were previously found with altered expression in colorectal cancer affected mucosa.MethodsBiopsies of colonic mucosa were sampled from 27 patients referred for colonoscopy on suspicion of colorectal disease. Of these, 14 patients had present or previous CRN and the remaining 13 patients served as controls. Using qPCR and Western blot technique, we investigated mRNA and protein expressions. Expressions were investigated for selected kinases in the extracellular signal-regulated kinase/mitogen activated protein kinase (ERK/MAPK), the phosphoinositide 3-kinase/Akt, and the Wnt/-catenin pathways as well as for selected phosphatases and several entities associated with prostaglandin E2 (PGE(2)) signaling. Colonic mucosal contents of PGE(2) and PGE(2) metabolites were determined by use of ELISA.ResultsWe found up-regulation of ERK1, ERK2, Akt1, Akt2, PLA2G4A, prostanoid receptor EP3 and phosphatase scaffold subunit PPP2R1B mRNA expression in normal appearing colonic mucosa of CRN patients compared to controls.ConclusionPresent study supports that even normal appearing mucosa of CRN patients differs from that of non-CRN patients at a molecular level. Especially expression of ERK1 mRNA was increased (p=0.007) in CRN group. ERK1 may therefore be considered a potential candidate gene as predictive biomarker for developing CRN. Further validation in larger cohorts are required to determine such predictive use in translational medicine and clinics.
KW - Extracellular signal-regulated kinase (ERK)
KW - Akt
KW - Prostaglandin E2
KW - -Catenin
KW - Colorectal cancer
U2 - 10.1186/s12885-019-5833-8
DO - 10.1186/s12885-019-5833-8
M3 - Journal article
C2 - 31253108
VL - 19
JO - B M C Cancer
JF - B M C Cancer
SN - 1471-2407
M1 - 643
ER -