High prevalence of Foxp3 and IL17 in MMR-proficient colorectal carcinomas
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Summary
This summary is machine-generated.Colorectal cancer (CRC) immune responses differ based on DNA repair status. Microsatellite instability-high (MSI-H) CRC shows higher cytotoxic markers, while mismatch repair-proficient (MSS) CRC exhibits elevated regulatory and inflammatory markers, suggesting distinct prognostic biomarkers.
Area Of Science
- Oncology
- Immunology
- Molecular Biology
Background
- Colorectal cancer (CRC) exhibits diverse DNA alterations, including microsatellite instability (MSI).
- Microsatellite instability-high (MSI-H) CRC generally has a favorable prognosis, potentially linked to tumor-infiltrating lymphocytes.
- Understanding immune responses in mismatch repair-proficient (MSS) CRC is crucial for prognostic insights.
Purpose Of The Study
- To characterize intratumoral immune response marker expression in MSS CRC.
- To investigate the relationship between immune markers and MMR status in CRC.
Main Methods
- Quantitative reverse transcription-PCR (qRT-PCR) was used to measure 15 immune markers in 90 human colon cancers (T) and matched normal tissues (NT).
- Immunohistochemistry (IHC) was performed for interleukin 17 (IL17) and CD3.
- mRNA expression levels were correlated with mismatch repair (MMR) status.
Main Results
- Tumors showed significantly higher expression of cytotoxic markers (FasL, granzyme B, perforin) and inflammatory cytokines (IL1beta, IL6, IL8, IL17, TGFbeta) compared to normal tissues.
- MSI-H phenotype correlated with higher granzyme B and perforin expression.
- MSS phenotype was associated with higher expression of Foxp3, IL17, IL1beta, IL6, and TGFbeta, with higher IL17 T/NT ratios observed in MSS tissues.
Conclusions
- Immune gene expression profiling in CRC reveals distinct patterns based on MMR status.
- Elevated Foxp3, IL6, TGFbeta, and IL17 expression are key features of MMR-proficient CRC.
- These markers may serve as potential biomarkers for a novel prognostic test in sporadic CRCs.