Low density of FOXP3-positive T cells in normal colonic mucosa is related to the presence of beta2-microglobulin mutations in Lynch syndrome-associated colorectal cancer
Microsatellite instability (MSI-H) is caused by DNA mismatch repair deficiency and occurs in 15% of colorectal cancers. MSI-H cancers generate highly immunogenic frameshift peptide (FSP) antigens, which elicit pronounced local immune responses. A subset of MSI-H colorectal cancers develops in frame...
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
26 Feb 2016
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| In: |
OncoImmunology
Year: 2016, Volume: 5, Issue: 2, Pages: e1075692-1-e1075692-8 |
| ISSN: | 2162-402X |
| DOI: | 10.1080/2162402X.2015.1075692 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1080/2162402X.2015.1075692
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| Author Notes: | Fabian Echterdiek, Jonas Janikovits, Laura Staffa, Meike Müller, Bernd Lahrmann, Monika Frühschütz, Benjamin Hartog, Nina Nelius, Axel Benner, Mirjam Tariverdian, Magnus von Knebel Doeberitz, Niels Grabe, and Matthias Kloor |
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| 245 | 1 | 0 | |a Low density of FOXP3-positive T cells in normal colonic mucosa is related to the presence of beta2-microglobulin mutations in Lynch syndrome-associated colorectal cancer |c Fabian Echterdiek, Jonas Janikovits, Laura Staffa, Meike Müller, Bernd Lahrmann, Monika Frühschütz, Benjamin Hartog, Nina Nelius, Axel Benner, Mirjam Tariverdian, Magnus von Knebel Doeberitz, Niels Grabe, and Matthias Kloor |
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| 520 | |a Microsatellite instability (MSI-H) is caused by DNA mismatch repair deficiency and occurs in 15% of colorectal cancers. MSI-H cancers generate highly immunogenic frameshift peptide (FSP) antigens, which elicit pronounced local immune responses. A subset of MSI-H colorectal cancers develops in frame of Lynch syndrome, which represents an ideal human model for studying the concept of immunoediting. Immunoediting describes how continuous anti-tumoral immune surveillance of the host eventually leads to the selection of tumor cells that escape immune cell recognition and destruction. Between 30 and 40% of Lynch syndrome-associated colorectal cancers display loss of HLA class I antigen expression as a result of Beta2-microglobulin (B2M) mutations. Whether B2M mutations result from immunoediting has been unknown. To address this question, we related B2M mutation status of Lynch syndrome-associated colorectal cancer specimens (n = 30) to CD3-positive, CD8-positive and FOXP3-positive T cell infiltration in both tumor and normal mucosa. No significant correlation between B2M mutations and immune cell infiltration was observed in tumor tissue. However, FOXP3-positive T cell infiltration was significantly lower in normal mucosa adjacent to B2M-mutant (mt) compared to B2M-wild type (wt) tumors (mean: 0.98% FOXP3-positive area/region of interest (ROI) in B2M-wt vs. 0.52% FOXP3-positive area/ROI in B2M-mt, p = 0.023). Our results suggest that in the absence of immune-suppressive regulatory T cells (Treg), the outgrowth of less immunogenic B2M-mt tumor cells is favored. This finding supports the immunoediting concept in human solid cancer development and indicates a critical role of the immune milieu in normal colonic mucosa for the course of disease. | ||
| 650 | 4 | |a Beta2-microglobulin | |
| 650 | 4 | |a colorectal cancer | |
| 650 | 4 | |a hereditary cancer | |
| 650 | 4 | |a immunoediting | |
| 650 | 4 | |a Lynch syndrome | |
| 650 | 4 | |a microsatellite instability | |
| 650 | 4 | |a regulatory T cells | |
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