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The inflammatory microenvironment in colorectal neoplasia
Mairi H McLean1, Graeme I Murray, Keith N Stewart
1Gastrointestinal Research Group, School of Medicine and Dentistry, Aberdeen University, Aberdeen, United Kingdom.
Plos One
|January 21, 2011
Summary
Inflammation is present in pre-malignant colonic adenomas, with increased immune cells and specific gene changes. This finding offers insights into early colorectal cancer development.
Area of Science:
- Gastroenterology
- Oncology
- Immunology
Background:
- Colorectal cancer (CRC) poses a significant global health burden.
- Stromal inflammatory activity in invasive CRC predicts prognosis.
- Inflammatory profiles in pre-malignant colonic adenomas remain largely uncharacterized.
Purpose of the Study:
- To investigate the inflammatory phenotype within human colonic adenomas.
- To correlate inflammatory cell infiltration with adenoma characteristics.
- To explore inflammatory gene expression in early colorectal neoplasia.
Main Methods:
- Immunohistochemistry to assess inflammatory cell infiltrate (macrophages, neutrophils, T cells) in adenomas and adjacent normal mucosa.
- Double stain immunohistochemistry to determine macrophage phenotype (iNOS expression).
- RT-PCR to analyze the expression of targeted inflammatory cytokine and receptor genes.
Main Results:
- Increased infiltration of macrophages, neutrophils, and T cells in adenomas compared to normal mucosa.
- Higher immune cell infiltration correlated with increased dysplasia and adenoma size.
- Macrophages in adenomas exhibited a pro-inflammatory phenotype (iNOS expression).
- Dysregulation of several inflammatory cytokine genes (e.g., CXCL1, CCL20, IL8) was observed in adenomas.
Conclusions:
- Pre-malignant colonic adenomas exhibit significant inflammatory cell infiltration.
- The observed inflammation, particularly macrophage phenotype and gene expression, may play a role in early colorectal carcinogenesis.
- Understanding these inflammatory pathways could reveal new targets for CRC prevention and treatment.
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