Increased Nuclear Factor-κB/RelA Expression Levels in Human Colorectal Carcinoma in North Indian Patients

Abstract

Colorectal cancer is a major cause of cancer-related death in many countries. Inflammatory pathway is considered to play a major role in colorectal carcinogenesis. Nuclear factor kappa B (NF-κB) pathway is a link between inflammation and cancer. NF-κB is a transcription factor which belongs to the Rel family. Activation of NF-κB has been shown to play a role in cell proliferation, apoptosis, cytokine production, and oncogenesis. The aim of the present study was to evaluate the expression levels of NF-κB/RelA in colorectal carcinoma using Real-time PCR. For this study, tumor tissue was taken from general surgery OT of PGIMER, Chandigarh from twenty-seven patients of colorectal cancer treated by surgery. Adjacent colonic mucosa specimens were also collected from all patients as normal control tissue. Real-time PCR was performed to determine the nuclear factor-κB/RelA expression levels in twenty-seven pairs of colorectal adenocarcinoma and adjacent normal colonic tissues. Out of 27 CRC patients, 18 were males and 9 females. Mean age of patients was 51.1 ± 14.8 years. Most of the cases were males (67%). Seventy percent of the cases were early (I–II) and 30% were advanced (III–IV) tumor stage. The quantitative relative expression of NF-kB mRNA was found to be significantly higher (p < 0.05) in CRC tissues as compared with that in adjacent normal colon tissues. From this study, we can conclude that RelA/NF-kB pathway is expressed constitutively in colorectal adenoma and adenocarcinomas. Thus, RelA/NF-kB might play an important role in colorectal tumorigenesis.